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Diffstat (limited to 'fluent-bit/lib/librdkafka-2.1.0/src/rdkafka.h')
| -rw-r--r-- | fluent-bit/lib/librdkafka-2.1.0/src/rdkafka.h | 9340 |
1 files changed, 9340 insertions, 0 deletions
diff --git a/fluent-bit/lib/librdkafka-2.1.0/src/rdkafka.h b/fluent-bit/lib/librdkafka-2.1.0/src/rdkafka.h new file mode 100644 index 000000000..e3474e50f --- /dev/null +++ b/fluent-bit/lib/librdkafka-2.1.0/src/rdkafka.h @@ -0,0 +1,9340 @@ +/* + * librdkafka - Apache Kafka C library + * + * Copyright (c) 2012-2022 Magnus Edenhill + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/** + * @file rdkafka.h + * @brief Apache Kafka C/C++ consumer and producer client library. + * + * rdkafka.h contains the public API for librdkafka. + * The API is documented in this file as comments prefixing the function, type, + * enum, define, etc. + * + * @sa For the C++ interface see rdkafkacpp.h + * + * @tableofcontents + */ + + +/* @cond NO_DOC */ +#ifndef _RDKAFKA_H_ +#define _RDKAFKA_H_ + +#include <stdio.h> +#include <inttypes.h> +#include <sys/types.h> + +#ifdef __cplusplus +extern "C" { +#if 0 +} /* Restore indent */ +#endif +#endif + +#ifdef _WIN32 +#include <basetsd.h> +#ifndef WIN32_MEAN_AND_LEAN +#define WIN32_MEAN_AND_LEAN +#endif +#include <winsock2.h> /* for sockaddr, .. */ +#ifndef _SSIZE_T_DEFINED +#define _SSIZE_T_DEFINED +typedef SSIZE_T ssize_t; +#endif +#define RD_UNUSED +#define RD_INLINE __inline +#define RD_DEPRECATED __declspec(deprecated) +#define RD_FORMAT(...) +#undef RD_EXPORT +#ifdef LIBRDKAFKA_STATICLIB +#define RD_EXPORT +#else +#ifdef LIBRDKAFKA_EXPORTS +#define RD_EXPORT __declspec(dllexport) +#else +#define RD_EXPORT __declspec(dllimport) +#endif +#ifndef LIBRDKAFKA_TYPECHECKS +#define LIBRDKAFKA_TYPECHECKS 0 +#endif +#endif + +#else +#include <sys/socket.h> /* for sockaddr, .. */ + +#define RD_UNUSED __attribute__((unused)) +#define RD_INLINE inline +#define RD_EXPORT +#define RD_DEPRECATED __attribute__((deprecated)) + +#if defined(__clang__) || defined(__GNUC__) || defined(__GNUG__) +#define RD_HAS_STATEMENT_EXPRESSIONS +#define RD_FORMAT(...) __attribute__((format(__VA_ARGS__))) +#else +#define RD_FORMAT(...) +#endif + +#ifndef LIBRDKAFKA_TYPECHECKS +#define LIBRDKAFKA_TYPECHECKS 1 +#endif +#endif + + +/** + * @brief Type-checking macros + * Compile-time checking that \p ARG is of type \p TYPE. + * @returns \p RET + */ +#if LIBRDKAFKA_TYPECHECKS +#define _LRK_TYPECHECK(RET, TYPE, ARG) \ + ({ \ + if (0) { \ + TYPE __t RD_UNUSED = (ARG); \ + } \ + RET; \ + }) + +#define _LRK_TYPECHECK2(RET, TYPE, ARG, TYPE2, ARG2) \ + ({ \ + if (0) { \ + TYPE __t RD_UNUSED = (ARG); \ + TYPE2 __t2 RD_UNUSED = (ARG2); \ + } \ + RET; \ + }) + +#define _LRK_TYPECHECK3(RET, TYPE, ARG, TYPE2, ARG2, TYPE3, ARG3) \ + ({ \ + if (0) { \ + TYPE __t RD_UNUSED = (ARG); \ + TYPE2 __t2 RD_UNUSED = (ARG2); \ + TYPE3 __t3 RD_UNUSED = (ARG3); \ + } \ + RET; \ + }) +#else +#define _LRK_TYPECHECK(RET, TYPE, ARG) (RET) +#define _LRK_TYPECHECK2(RET, TYPE, ARG, TYPE2, ARG2) (RET) +#define _LRK_TYPECHECK3(RET, TYPE, ARG, TYPE2, ARG2, TYPE3, ARG3) (RET) +#endif + +/* @endcond */ + + +/** + * @name librdkafka version + * @{ + * + * + */ + +/** + * @brief librdkafka version + * + * Interpreted as hex \c MM.mm.rr.xx: + * - MM = Major + * - mm = minor + * - rr = revision + * - xx = pre-release id (0xff is the final release) + * + * E.g.: \c 0x000801ff = 0.8.1 + * + * @remark This value should only be used during compile time, + * for runtime checks of version use rd_kafka_version() + */ +#define RD_KAFKA_VERSION 0x020100ff + +/** + * @brief Returns the librdkafka version as integer. + * + * @returns Version integer. + * + * @sa See RD_KAFKA_VERSION for how to parse the integer format. + * @sa Use rd_kafka_version_str() to retreive the version as a string. + */ +RD_EXPORT +int rd_kafka_version(void); + +/** + * @brief Returns the librdkafka version as string. + * + * @returns Version string + */ +RD_EXPORT +const char *rd_kafka_version_str(void); + +/**@}*/ + + +/** + * @name Constants, errors, types + * @{ + * + * + */ + + +/** + * @enum rd_kafka_type_t + * + * @brief rd_kafka_t handle type. + * + * @sa rd_kafka_new() + */ +typedef enum rd_kafka_type_t { + RD_KAFKA_PRODUCER, /**< Producer client */ + RD_KAFKA_CONSUMER /**< Consumer client */ +} rd_kafka_type_t; + + +/*! + * Timestamp types + * + * @sa rd_kafka_message_timestamp() + */ +typedef enum rd_kafka_timestamp_type_t { + RD_KAFKA_TIMESTAMP_NOT_AVAILABLE, /**< Timestamp not available */ + RD_KAFKA_TIMESTAMP_CREATE_TIME, /**< Message creation time */ + RD_KAFKA_TIMESTAMP_LOG_APPEND_TIME /**< Log append time */ +} rd_kafka_timestamp_type_t; + + + +/** + * @brief Retrieve supported debug contexts for use with the \c \"debug\" + * configuration property. (runtime) + * + * @returns Comma-separated list of available debugging contexts. + */ +RD_EXPORT +const char *rd_kafka_get_debug_contexts(void); + +/** + * @brief Supported debug contexts. (compile time) + * + * @deprecated This compile time value may be outdated at runtime due to + * linking another version of the library. + * Use rd_kafka_get_debug_contexts() instead. + */ +#define RD_KAFKA_DEBUG_CONTEXTS \ + "all,generic,broker,topic,metadata,feature,queue,msg,protocol,cgrp," \ + "security,fetch,interceptor,plugin,consumer,admin,eos,mock,assignor," \ + "conf" + + +/* @cond NO_DOC */ +/* Private types to provide ABI compatibility */ +typedef struct rd_kafka_s rd_kafka_t; +typedef struct rd_kafka_topic_s rd_kafka_topic_t; +typedef struct rd_kafka_conf_s rd_kafka_conf_t; +typedef struct rd_kafka_topic_conf_s rd_kafka_topic_conf_t; +typedef struct rd_kafka_queue_s rd_kafka_queue_t; +typedef struct rd_kafka_op_s rd_kafka_event_t; +typedef struct rd_kafka_topic_result_s rd_kafka_topic_result_t; +typedef struct rd_kafka_consumer_group_metadata_s + rd_kafka_consumer_group_metadata_t; +typedef struct rd_kafka_error_s rd_kafka_error_t; +typedef struct rd_kafka_headers_s rd_kafka_headers_t; +typedef struct rd_kafka_group_result_s rd_kafka_group_result_t; +typedef struct rd_kafka_acl_result_s rd_kafka_acl_result_t; +/* @endcond */ + + +/** + * @enum rd_kafka_resp_err_t + * @brief Error codes. + * + * The negative error codes delimited by two underscores + * (\c RD_KAFKA_RESP_ERR__..) denotes errors internal to librdkafka and are + * displayed as \c \"Local: \<error string..\>\", while the error codes + * delimited by a single underscore (\c RD_KAFKA_RESP_ERR_..) denote broker + * errors and are displayed as \c \"Broker: \<error string..\>\". + * + * @sa Use rd_kafka_err2str() to translate an error code a human readable string + */ +typedef enum { + /* Internal errors to rdkafka: */ + /** Begin internal error codes */ + RD_KAFKA_RESP_ERR__BEGIN = -200, + /** Received message is incorrect */ + RD_KAFKA_RESP_ERR__BAD_MSG = -199, + /** Bad/unknown compression */ + RD_KAFKA_RESP_ERR__BAD_COMPRESSION = -198, + /** Broker is going away */ + RD_KAFKA_RESP_ERR__DESTROY = -197, + /** Generic failure */ + RD_KAFKA_RESP_ERR__FAIL = -196, + /** Broker transport failure */ + RD_KAFKA_RESP_ERR__TRANSPORT = -195, + /** Critical system resource */ + RD_KAFKA_RESP_ERR__CRIT_SYS_RESOURCE = -194, + /** Failed to resolve broker */ + RD_KAFKA_RESP_ERR__RESOLVE = -193, + /** Produced message timed out*/ + RD_KAFKA_RESP_ERR__MSG_TIMED_OUT = -192, + /** Reached the end of the topic+partition queue on + * the broker. Not really an error. + * This event is disabled by default, + * see the `enable.partition.eof` configuration property. */ + RD_KAFKA_RESP_ERR__PARTITION_EOF = -191, + /** Permanent: Partition does not exist in cluster. */ + RD_KAFKA_RESP_ERR__UNKNOWN_PARTITION = -190, + /** File or filesystem error */ + RD_KAFKA_RESP_ERR__FS = -189, + /** Permanent: Topic does not exist in cluster. */ + RD_KAFKA_RESP_ERR__UNKNOWN_TOPIC = -188, + /** All broker connections are down. */ + RD_KAFKA_RESP_ERR__ALL_BROKERS_DOWN = -187, + /** Invalid argument, or invalid configuration */ + RD_KAFKA_RESP_ERR__INVALID_ARG = -186, + /** Operation timed out */ + RD_KAFKA_RESP_ERR__TIMED_OUT = -185, + /** Queue is full */ + RD_KAFKA_RESP_ERR__QUEUE_FULL = -184, + /** ISR count < required.acks */ + RD_KAFKA_RESP_ERR__ISR_INSUFF = -183, + /** Broker node update */ + RD_KAFKA_RESP_ERR__NODE_UPDATE = -182, + /** SSL error */ + RD_KAFKA_RESP_ERR__SSL = -181, + /** Waiting for coordinator to become available. */ + RD_KAFKA_RESP_ERR__WAIT_COORD = -180, + /** Unknown client group */ + RD_KAFKA_RESP_ERR__UNKNOWN_GROUP = -179, + /** Operation in progress */ + RD_KAFKA_RESP_ERR__IN_PROGRESS = -178, + /** Previous operation in progress, wait for it to finish. */ + RD_KAFKA_RESP_ERR__PREV_IN_PROGRESS = -177, + /** This operation would interfere with an existing subscription */ + RD_KAFKA_RESP_ERR__EXISTING_SUBSCRIPTION = -176, + /** Assigned partitions (rebalance_cb) */ + RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS = -175, + /** Revoked partitions (rebalance_cb) */ + RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS = -174, + /** Conflicting use */ + RD_KAFKA_RESP_ERR__CONFLICT = -173, + /** Wrong state */ + RD_KAFKA_RESP_ERR__STATE = -172, + /** Unknown protocol */ + RD_KAFKA_RESP_ERR__UNKNOWN_PROTOCOL = -171, + /** Not implemented */ + RD_KAFKA_RESP_ERR__NOT_IMPLEMENTED = -170, + /** Authentication failure*/ + RD_KAFKA_RESP_ERR__AUTHENTICATION = -169, + /** No stored offset */ + RD_KAFKA_RESP_ERR__NO_OFFSET = -168, + /** Outdated */ + RD_KAFKA_RESP_ERR__OUTDATED = -167, + /** Timed out in queue */ + RD_KAFKA_RESP_ERR__TIMED_OUT_QUEUE = -166, + /** Feature not supported by broker */ + RD_KAFKA_RESP_ERR__UNSUPPORTED_FEATURE = -165, + /** Awaiting cache update */ + RD_KAFKA_RESP_ERR__WAIT_CACHE = -164, + /** Operation interrupted (e.g., due to yield)) */ + RD_KAFKA_RESP_ERR__INTR = -163, + /** Key serialization error */ + RD_KAFKA_RESP_ERR__KEY_SERIALIZATION = -162, + /** Value serialization error */ + RD_KAFKA_RESP_ERR__VALUE_SERIALIZATION = -161, + /** Key deserialization error */ + RD_KAFKA_RESP_ERR__KEY_DESERIALIZATION = -160, + /** Value deserialization error */ + RD_KAFKA_RESP_ERR__VALUE_DESERIALIZATION = -159, + /** Partial response */ + RD_KAFKA_RESP_ERR__PARTIAL = -158, + /** Modification attempted on read-only object */ + RD_KAFKA_RESP_ERR__READ_ONLY = -157, + /** No such entry / item not found */ + RD_KAFKA_RESP_ERR__NOENT = -156, + /** Read underflow */ + RD_KAFKA_RESP_ERR__UNDERFLOW = -155, + /** Invalid type */ + RD_KAFKA_RESP_ERR__INVALID_TYPE = -154, + /** Retry operation */ + RD_KAFKA_RESP_ERR__RETRY = -153, + /** Purged in queue */ + RD_KAFKA_RESP_ERR__PURGE_QUEUE = -152, + /** Purged in flight */ + RD_KAFKA_RESP_ERR__PURGE_INFLIGHT = -151, + /** Fatal error: see rd_kafka_fatal_error() */ + RD_KAFKA_RESP_ERR__FATAL = -150, + /** Inconsistent state */ + RD_KAFKA_RESP_ERR__INCONSISTENT = -149, + /** Gap-less ordering would not be guaranteed if proceeding */ + RD_KAFKA_RESP_ERR__GAPLESS_GUARANTEE = -148, + /** Maximum poll interval exceeded */ + RD_KAFKA_RESP_ERR__MAX_POLL_EXCEEDED = -147, + /** Unknown broker */ + RD_KAFKA_RESP_ERR__UNKNOWN_BROKER = -146, + /** Functionality not configured */ + RD_KAFKA_RESP_ERR__NOT_CONFIGURED = -145, + /** Instance has been fenced */ + RD_KAFKA_RESP_ERR__FENCED = -144, + /** Application generated error */ + RD_KAFKA_RESP_ERR__APPLICATION = -143, + /** Assignment lost */ + RD_KAFKA_RESP_ERR__ASSIGNMENT_LOST = -142, + /** No operation performed */ + RD_KAFKA_RESP_ERR__NOOP = -141, + /** No offset to automatically reset to */ + RD_KAFKA_RESP_ERR__AUTO_OFFSET_RESET = -140, + /** Partition log truncation detected */ + RD_KAFKA_RESP_ERR__LOG_TRUNCATION = -139, + + /** End internal error codes */ + RD_KAFKA_RESP_ERR__END = -100, + + /* Kafka broker errors: */ + /** Unknown broker error */ + RD_KAFKA_RESP_ERR_UNKNOWN = -1, + /** Success */ + RD_KAFKA_RESP_ERR_NO_ERROR = 0, + /** Offset out of range */ + RD_KAFKA_RESP_ERR_OFFSET_OUT_OF_RANGE = 1, + /** Invalid message */ + RD_KAFKA_RESP_ERR_INVALID_MSG = 2, + /** Unknown topic or partition */ + RD_KAFKA_RESP_ERR_UNKNOWN_TOPIC_OR_PART = 3, + /** Invalid message size */ + RD_KAFKA_RESP_ERR_INVALID_MSG_SIZE = 4, + /** Leader not available */ + RD_KAFKA_RESP_ERR_LEADER_NOT_AVAILABLE = 5, +/** Not leader for partition */ +#define RD_KAFKA_RESP_ERR_NOT_LEADER_OR_FOLLOWER \ + RD_KAFKA_RESP_ERR_NOT_LEADER_FOR_PARTITION + RD_KAFKA_RESP_ERR_NOT_LEADER_FOR_PARTITION = 6, + /** Request timed out */ + RD_KAFKA_RESP_ERR_REQUEST_TIMED_OUT = 7, + /** Broker not available */ + RD_KAFKA_RESP_ERR_BROKER_NOT_AVAILABLE = 8, + /** Replica not available */ + RD_KAFKA_RESP_ERR_REPLICA_NOT_AVAILABLE = 9, + /** Message size too large */ + RD_KAFKA_RESP_ERR_MSG_SIZE_TOO_LARGE = 10, + /** StaleControllerEpochCode */ + RD_KAFKA_RESP_ERR_STALE_CTRL_EPOCH = 11, + /** Offset metadata string too large */ + RD_KAFKA_RESP_ERR_OFFSET_METADATA_TOO_LARGE = 12, + /** Broker disconnected before response received */ + RD_KAFKA_RESP_ERR_NETWORK_EXCEPTION = 13, + /** Coordinator load in progress */ + RD_KAFKA_RESP_ERR_COORDINATOR_LOAD_IN_PROGRESS = 14, +/** Group coordinator load in progress */ +#define RD_KAFKA_RESP_ERR_GROUP_LOAD_IN_PROGRESS \ + RD_KAFKA_RESP_ERR_COORDINATOR_LOAD_IN_PROGRESS + /** Coordinator not available */ + RD_KAFKA_RESP_ERR_COORDINATOR_NOT_AVAILABLE = 15, +/** Group coordinator not available */ +#define RD_KAFKA_RESP_ERR_GROUP_COORDINATOR_NOT_AVAILABLE \ + RD_KAFKA_RESP_ERR_COORDINATOR_NOT_AVAILABLE + /** Not coordinator */ + RD_KAFKA_RESP_ERR_NOT_COORDINATOR = 16, +/** Not coordinator for group */ +#define RD_KAFKA_RESP_ERR_NOT_COORDINATOR_FOR_GROUP \ + RD_KAFKA_RESP_ERR_NOT_COORDINATOR + /** Invalid topic */ + RD_KAFKA_RESP_ERR_TOPIC_EXCEPTION = 17, + /** Message batch larger than configured server segment size */ + RD_KAFKA_RESP_ERR_RECORD_LIST_TOO_LARGE = 18, + /** Not enough in-sync replicas */ + RD_KAFKA_RESP_ERR_NOT_ENOUGH_REPLICAS = 19, + /** Message(s) written to insufficient number of in-sync replicas */ + RD_KAFKA_RESP_ERR_NOT_ENOUGH_REPLICAS_AFTER_APPEND = 20, + /** Invalid required acks value */ + RD_KAFKA_RESP_ERR_INVALID_REQUIRED_ACKS = 21, + /** Specified group generation id is not valid */ + RD_KAFKA_RESP_ERR_ILLEGAL_GENERATION = 22, + /** Inconsistent group protocol */ + RD_KAFKA_RESP_ERR_INCONSISTENT_GROUP_PROTOCOL = 23, + /** Invalid group.id */ + RD_KAFKA_RESP_ERR_INVALID_GROUP_ID = 24, + /** Unknown member */ + RD_KAFKA_RESP_ERR_UNKNOWN_MEMBER_ID = 25, + /** Invalid session timeout */ + RD_KAFKA_RESP_ERR_INVALID_SESSION_TIMEOUT = 26, + /** Group rebalance in progress */ + RD_KAFKA_RESP_ERR_REBALANCE_IN_PROGRESS = 27, + /** Commit offset data size is not valid */ + RD_KAFKA_RESP_ERR_INVALID_COMMIT_OFFSET_SIZE = 28, + /** Topic authorization failed */ + RD_KAFKA_RESP_ERR_TOPIC_AUTHORIZATION_FAILED = 29, + /** Group authorization failed */ + RD_KAFKA_RESP_ERR_GROUP_AUTHORIZATION_FAILED = 30, + /** Cluster authorization failed */ + RD_KAFKA_RESP_ERR_CLUSTER_AUTHORIZATION_FAILED = 31, + /** Invalid timestamp */ + RD_KAFKA_RESP_ERR_INVALID_TIMESTAMP = 32, + /** Unsupported SASL mechanism */ + RD_KAFKA_RESP_ERR_UNSUPPORTED_SASL_MECHANISM = 33, + /** Illegal SASL state */ + RD_KAFKA_RESP_ERR_ILLEGAL_SASL_STATE = 34, + /** Unuspported version */ + RD_KAFKA_RESP_ERR_UNSUPPORTED_VERSION = 35, + /** Topic already exists */ + RD_KAFKA_RESP_ERR_TOPIC_ALREADY_EXISTS = 36, + /** Invalid number of partitions */ + RD_KAFKA_RESP_ERR_INVALID_PARTITIONS = 37, + /** Invalid replication factor */ + RD_KAFKA_RESP_ERR_INVALID_REPLICATION_FACTOR = 38, + /** Invalid replica assignment */ + RD_KAFKA_RESP_ERR_INVALID_REPLICA_ASSIGNMENT = 39, + /** Invalid config */ + RD_KAFKA_RESP_ERR_INVALID_CONFIG = 40, + /** Not controller for cluster */ + RD_KAFKA_RESP_ERR_NOT_CONTROLLER = 41, + /** Invalid request */ + RD_KAFKA_RESP_ERR_INVALID_REQUEST = 42, + /** Message format on broker does not support request */ + RD_KAFKA_RESP_ERR_UNSUPPORTED_FOR_MESSAGE_FORMAT = 43, + /** Policy violation */ + RD_KAFKA_RESP_ERR_POLICY_VIOLATION = 44, + /** Broker received an out of order sequence number */ + RD_KAFKA_RESP_ERR_OUT_OF_ORDER_SEQUENCE_NUMBER = 45, + /** Broker received a duplicate sequence number */ + RD_KAFKA_RESP_ERR_DUPLICATE_SEQUENCE_NUMBER = 46, + /** Producer attempted an operation with an old epoch */ + RD_KAFKA_RESP_ERR_INVALID_PRODUCER_EPOCH = 47, + /** Producer attempted a transactional operation in an invalid state */ + RD_KAFKA_RESP_ERR_INVALID_TXN_STATE = 48, + /** Producer attempted to use a producer id which is not + * currently assigned to its transactional id */ + RD_KAFKA_RESP_ERR_INVALID_PRODUCER_ID_MAPPING = 49, + /** Transaction timeout is larger than the maximum + * value allowed by the broker's max.transaction.timeout.ms */ + RD_KAFKA_RESP_ERR_INVALID_TRANSACTION_TIMEOUT = 50, + /** Producer attempted to update a transaction while another + * concurrent operation on the same transaction was ongoing */ + RD_KAFKA_RESP_ERR_CONCURRENT_TRANSACTIONS = 51, + /** Indicates that the transaction coordinator sending a + * WriteTxnMarker is no longer the current coordinator for a + * given producer */ + RD_KAFKA_RESP_ERR_TRANSACTION_COORDINATOR_FENCED = 52, + /** Transactional Id authorization failed */ + RD_KAFKA_RESP_ERR_TRANSACTIONAL_ID_AUTHORIZATION_FAILED = 53, + /** Security features are disabled */ + RD_KAFKA_RESP_ERR_SECURITY_DISABLED = 54, + /** Operation not attempted */ + RD_KAFKA_RESP_ERR_OPERATION_NOT_ATTEMPTED = 55, + /** Disk error when trying to access log file on the disk */ + RD_KAFKA_RESP_ERR_KAFKA_STORAGE_ERROR = 56, + /** The user-specified log directory is not found in the broker config + */ + RD_KAFKA_RESP_ERR_LOG_DIR_NOT_FOUND = 57, + /** SASL Authentication failed */ + RD_KAFKA_RESP_ERR_SASL_AUTHENTICATION_FAILED = 58, + /** Unknown Producer Id */ + RD_KAFKA_RESP_ERR_UNKNOWN_PRODUCER_ID = 59, + /** Partition reassignment is in progress */ + RD_KAFKA_RESP_ERR_REASSIGNMENT_IN_PROGRESS = 60, + /** Delegation Token feature is not enabled */ + RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_AUTH_DISABLED = 61, + /** Delegation Token is not found on server */ + RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_NOT_FOUND = 62, + /** Specified Principal is not valid Owner/Renewer */ + RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_OWNER_MISMATCH = 63, + /** Delegation Token requests are not allowed on this connection */ + RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_REQUEST_NOT_ALLOWED = 64, + /** Delegation Token authorization failed */ + RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_AUTHORIZATION_FAILED = 65, + /** Delegation Token is expired */ + RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_EXPIRED = 66, + /** Supplied principalType is not supported */ + RD_KAFKA_RESP_ERR_INVALID_PRINCIPAL_TYPE = 67, + /** The group is not empty */ + RD_KAFKA_RESP_ERR_NON_EMPTY_GROUP = 68, + /** The group id does not exist */ + RD_KAFKA_RESP_ERR_GROUP_ID_NOT_FOUND = 69, + /** The fetch session ID was not found */ + RD_KAFKA_RESP_ERR_FETCH_SESSION_ID_NOT_FOUND = 70, + /** The fetch session epoch is invalid */ + RD_KAFKA_RESP_ERR_INVALID_FETCH_SESSION_EPOCH = 71, + /** No matching listener */ + RD_KAFKA_RESP_ERR_LISTENER_NOT_FOUND = 72, + /** Topic deletion is disabled */ + RD_KAFKA_RESP_ERR_TOPIC_DELETION_DISABLED = 73, + /** Leader epoch is older than broker epoch */ + RD_KAFKA_RESP_ERR_FENCED_LEADER_EPOCH = 74, + /** Leader epoch is newer than broker epoch */ + RD_KAFKA_RESP_ERR_UNKNOWN_LEADER_EPOCH = 75, + /** Unsupported compression type */ + RD_KAFKA_RESP_ERR_UNSUPPORTED_COMPRESSION_TYPE = 76, + /** Broker epoch has changed */ + RD_KAFKA_RESP_ERR_STALE_BROKER_EPOCH = 77, + /** Leader high watermark is not caught up */ + RD_KAFKA_RESP_ERR_OFFSET_NOT_AVAILABLE = 78, + /** Group member needs a valid member ID */ + RD_KAFKA_RESP_ERR_MEMBER_ID_REQUIRED = 79, + /** Preferred leader was not available */ + RD_KAFKA_RESP_ERR_PREFERRED_LEADER_NOT_AVAILABLE = 80, + /** Consumer group has reached maximum size */ + RD_KAFKA_RESP_ERR_GROUP_MAX_SIZE_REACHED = 81, + /** Static consumer fenced by other consumer with same + * group.instance.id. */ + RD_KAFKA_RESP_ERR_FENCED_INSTANCE_ID = 82, + /** Eligible partition leaders are not available */ + RD_KAFKA_RESP_ERR_ELIGIBLE_LEADERS_NOT_AVAILABLE = 83, + /** Leader election not needed for topic partition */ + RD_KAFKA_RESP_ERR_ELECTION_NOT_NEEDED = 84, + /** No partition reassignment is in progress */ + RD_KAFKA_RESP_ERR_NO_REASSIGNMENT_IN_PROGRESS = 85, + /** Deleting offsets of a topic while the consumer group is + * subscribed to it */ + RD_KAFKA_RESP_ERR_GROUP_SUBSCRIBED_TO_TOPIC = 86, + /** Broker failed to validate record */ + RD_KAFKA_RESP_ERR_INVALID_RECORD = 87, + /** There are unstable offsets that need to be cleared */ + RD_KAFKA_RESP_ERR_UNSTABLE_OFFSET_COMMIT = 88, + /** Throttling quota has been exceeded */ + RD_KAFKA_RESP_ERR_THROTTLING_QUOTA_EXCEEDED = 89, + /** There is a newer producer with the same transactionalId + * which fences the current one */ + RD_KAFKA_RESP_ERR_PRODUCER_FENCED = 90, + /** Request illegally referred to resource that does not exist */ + RD_KAFKA_RESP_ERR_RESOURCE_NOT_FOUND = 91, + /** Request illegally referred to the same resource twice */ + RD_KAFKA_RESP_ERR_DUPLICATE_RESOURCE = 92, + /** Requested credential would not meet criteria for acceptability */ + RD_KAFKA_RESP_ERR_UNACCEPTABLE_CREDENTIAL = 93, + /** Indicates that the either the sender or recipient of a + * voter-only request is not one of the expected voters */ + RD_KAFKA_RESP_ERR_INCONSISTENT_VOTER_SET = 94, + /** Invalid update version */ + RD_KAFKA_RESP_ERR_INVALID_UPDATE_VERSION = 95, + /** Unable to update finalized features due to server error */ + RD_KAFKA_RESP_ERR_FEATURE_UPDATE_FAILED = 96, + /** Request principal deserialization failed during forwarding */ + RD_KAFKA_RESP_ERR_PRINCIPAL_DESERIALIZATION_FAILURE = 97, + + RD_KAFKA_RESP_ERR_END_ALL, +} rd_kafka_resp_err_t; + + +/** + * @brief Error code value, name and description. + * Typically for use with language bindings to automatically expose + * the full set of librdkafka error codes. + */ +struct rd_kafka_err_desc { + rd_kafka_resp_err_t code; /**< Error code */ + const char *name; /**< Error name, same as code enum sans prefix */ + const char *desc; /**< Human readable error description. */ +}; + + +/** + * @brief Returns the full list of error codes. + */ +RD_EXPORT +void rd_kafka_get_err_descs(const struct rd_kafka_err_desc **errdescs, + size_t *cntp); + + + +/** + * @brief Returns a human readable representation of a kafka error. + * + * @param err Error code to translate + */ +RD_EXPORT +const char *rd_kafka_err2str(rd_kafka_resp_err_t err); + + + +/** + * @brief Returns the error code name (enum name). + * + * @param err Error code to translate + */ +RD_EXPORT +const char *rd_kafka_err2name(rd_kafka_resp_err_t err); + + +/** + * @brief Returns the last error code generated by a legacy API call + * in the current thread. + * + * The legacy APIs are the ones using errno to propagate error value, namely: + * - rd_kafka_topic_new() + * - rd_kafka_consume_start() + * - rd_kafka_consume_stop() + * - rd_kafka_consume() + * - rd_kafka_consume_batch() + * - rd_kafka_consume_callback() + * - rd_kafka_consume_queue() + * - rd_kafka_produce() + * + * The main use for this function is to avoid converting system \p errno + * values to rd_kafka_resp_err_t codes for legacy APIs. + * + * @remark The last error is stored per-thread, if multiple rd_kafka_t handles + * are used in the same application thread the developer needs to + * make sure rd_kafka_last_error() is called immediately after + * a failed API call. + * + * @remark errno propagation from librdkafka is not safe on Windows + * and should not be used, use rd_kafka_last_error() instead. + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_last_error(void); + + +/** + * @brief Converts the system errno value \p errnox to a rd_kafka_resp_err_t + * error code upon failure from the following functions: + * - rd_kafka_topic_new() + * - rd_kafka_consume_start() + * - rd_kafka_consume_stop() + * - rd_kafka_consume() + * - rd_kafka_consume_batch() + * - rd_kafka_consume_callback() + * - rd_kafka_consume_queue() + * - rd_kafka_produce() + * + * @param errnox System errno value to convert + * + * @returns Appropriate error code for \p errnox + * + * @remark A better alternative is to call rd_kafka_last_error() immediately + * after any of the above functions return -1 or NULL. + * + * @deprecated Use rd_kafka_last_error() to retrieve the last error code + * set by the legacy librdkafka APIs. + * + * @sa rd_kafka_last_error() + */ +RD_EXPORT RD_DEPRECATED rd_kafka_resp_err_t rd_kafka_errno2err(int errnox); + + +/** + * @brief Returns the thread-local system errno + * + * On most platforms this is the same as \p errno but in case of different + * runtimes between library and application (e.g., Windows static DLLs) + * this provides a means for exposing the errno librdkafka uses. + * + * @remark The value is local to the current calling thread. + * + * @deprecated Use rd_kafka_last_error() to retrieve the last error code + * set by the legacy librdkafka APIs. + */ +RD_EXPORT RD_DEPRECATED int rd_kafka_errno(void); + + + +/** + * @brief Returns the first fatal error set on this client instance, + * or RD_KAFKA_RESP_ERR_NO_ERROR if no fatal error has occurred. + * + * This function is to be used with the Idempotent Producer and \c error_cb + * to detect fatal errors. + * + * Generally all errors raised by \c error_cb are to be considered + * informational and temporary, the client will try to recover from all + * errors in a graceful fashion (by retrying, etc). + * + * However, some errors should logically be considered fatal to retain + * consistency; in particular a set of errors that may occur when using the + * Idempotent Producer and the in-order or exactly-once producer guarantees + * can't be satisfied. + * + * @param rk Client instance. + * @param errstr A human readable error string (nul-terminated) is written to + * this location that must be of at least \p errstr_size bytes. + * The \p errstr is only written to if there is a fatal error. + * @param errstr_size Writable size in \p errstr. + * + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR if no fatal error has been raised, else + * any other error code. + */ +RD_EXPORT +rd_kafka_resp_err_t +rd_kafka_fatal_error(rd_kafka_t *rk, char *errstr, size_t errstr_size); + + +/** + * @brief Trigger a fatal error for testing purposes. + * + * Since there is no practical way to trigger real fatal errors in the + * idempotent producer, this method allows an application to trigger + * fabricated fatal errors in tests to check its error handling code. + * + * @param rk Client instance. + * @param err The underlying error code. + * @param reason A human readable error reason. + * Will be prefixed with "test_fatal_error: " to differentiate + * from real fatal errors. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR if a fatal error was triggered, or + * RD_KAFKA_RESP_ERR__PREV_IN_PROGRESS if a previous fatal error + * has already been triggered. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_test_fatal_error(rd_kafka_t *rk, + rd_kafka_resp_err_t err, + const char *reason); + + +/** + * @returns the error code for \p error or RD_KAFKA_RESP_ERR_NO_ERROR if + * \p error is NULL. + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_error_code(const rd_kafka_error_t *error); + +/** + * @returns the error code name for \p error, e.g, "ERR_UNKNOWN_MEMBER_ID", + * or an empty string if \p error is NULL. + * + * @remark The lifetime of the returned pointer is the same as the error object. + * + * @sa rd_kafka_err2name() + */ +RD_EXPORT +const char *rd_kafka_error_name(const rd_kafka_error_t *error); + +/** + * @returns a human readable error string for \p error, + * or an empty string if \p error is NULL. + * + * @remark The lifetime of the returned pointer is the same as the error object. + */ +RD_EXPORT +const char *rd_kafka_error_string(const rd_kafka_error_t *error); + + +/** + * @returns 1 if the error is a fatal error, indicating that the client + * instance is no longer usable, else 0 (also if \p error is NULL). + */ +RD_EXPORT +int rd_kafka_error_is_fatal(const rd_kafka_error_t *error); + + +/** + * @returns 1 if the operation may be retried, + * else 0 (also if \p error is NULL). + */ +RD_EXPORT +int rd_kafka_error_is_retriable(const rd_kafka_error_t *error); + + +/** + * @returns 1 if the error is an abortable transaction error in which case + * the application must call rd_kafka_abort_transaction() and + * start a new transaction with rd_kafka_begin_transaction() if it + * wishes to proceed with transactions. + * Else returns 0 (also if \p error is NULL). + * + * @remark The return value of this method is only valid for errors returned + * by the transactional API. + */ +RD_EXPORT +int rd_kafka_error_txn_requires_abort(const rd_kafka_error_t *error); + +/** + * @brief Free and destroy an error object. + * + * @remark As a conveniance it is permitted to pass a NULL \p error. + */ +RD_EXPORT +void rd_kafka_error_destroy(rd_kafka_error_t *error); + + +/** + * @brief Create a new error object with error \p code and optional + * human readable error string in \p fmt. + * + * This method is mainly to be used for mocking errors in application test code. + * + * The returned object must be destroyed with rd_kafka_error_destroy(). + */ +RD_EXPORT +rd_kafka_error_t *rd_kafka_error_new(rd_kafka_resp_err_t code, + const char *fmt, + ...) RD_FORMAT(printf, 2, 3); + + +/** + * @brief Topic+Partition place holder + * + * Generic place holder for a Topic+Partition and its related information + * used for multiple purposes: + * - consumer offset (see rd_kafka_commit(), et.al.) + * - group rebalancing callback (rd_kafka_conf_set_rebalance_cb()) + * - offset commit result callback (rd_kafka_conf_set_offset_commit_cb()) + */ + +/** + * @brief Generic place holder for a specific Topic+Partition. + * + * @sa rd_kafka_topic_partition_list_new() + */ +typedef struct rd_kafka_topic_partition_s { + char *topic; /**< Topic name */ + int32_t partition; /**< Partition */ + int64_t offset; /**< Offset */ + void *metadata; /**< Metadata */ + size_t metadata_size; /**< Metadata size */ + void *opaque; /**< Opaque value for application use */ + rd_kafka_resp_err_t err; /**< Error code, depending on use. */ + void *_private; /**< INTERNAL USE ONLY, + * INITIALIZE TO ZERO, DO NOT TOUCH, + * DO NOT COPY, DO NOT SHARE WITH OTHER + * rd_kafka_t INSTANCES. */ +} rd_kafka_topic_partition_t; + + +/** + * @brief Destroy a rd_kafka_topic_partition_t. + * @remark This must not be called for elements in a topic partition list. + */ +RD_EXPORT +void rd_kafka_topic_partition_destroy(rd_kafka_topic_partition_t *rktpar); + + +/** + * @brief Sets the offset leader epoch (use -1 to clear). + * + * @param rktpar Partition object. + * @param leader_epoch Offset leader epoch, use -1 to reset. + * + * @remark See KIP-320 for more information. + */ +RD_EXPORT +void rd_kafka_topic_partition_set_leader_epoch( + rd_kafka_topic_partition_t *rktpar, + int32_t leader_epoch); + +/** + * @returns the offset leader epoch, if relevant and known, + * else -1. + * + * @param rktpar Partition object. + * + * @remark See KIP-320 for more information. + */ +RD_EXPORT +int32_t rd_kafka_topic_partition_get_leader_epoch( + const rd_kafka_topic_partition_t *rktpar); + +/** + * @brief A growable list of Topic+Partitions. + * + */ +typedef struct rd_kafka_topic_partition_list_s { + int cnt; /**< Current number of elements */ + int size; /**< Current allocated size */ + rd_kafka_topic_partition_t *elems; /**< Element array[] */ +} rd_kafka_topic_partition_list_t; + + +/** + * @brief Create a new list/vector Topic+Partition container. + * + * @param size Initial allocated size used when the expected number of + * elements is known or can be estimated. + * Avoids reallocation and possibly relocation of the + * elems array. + * + * @returns A newly allocated Topic+Partition list. + * + * @remark Use rd_kafka_topic_partition_list_destroy() to free all resources + * in use by a list and the list itself. + * @sa rd_kafka_topic_partition_list_add() + */ +RD_EXPORT +rd_kafka_topic_partition_list_t *rd_kafka_topic_partition_list_new(int size); + + +/** + * @brief Free all resources used by the list and the list itself. + */ +RD_EXPORT +void rd_kafka_topic_partition_list_destroy( + rd_kafka_topic_partition_list_t *rkparlist); + +/** + * @brief Add topic+partition to list + * + * @param rktparlist List to extend + * @param topic Topic name (copied) + * @param partition Partition id + * + * @returns The object which can be used to fill in additionals fields. + */ +RD_EXPORT +rd_kafka_topic_partition_t * +rd_kafka_topic_partition_list_add(rd_kafka_topic_partition_list_t *rktparlist, + const char *topic, + int32_t partition); + + +/** + * @brief Add range of partitions from \p start to \p stop inclusive. + * + * @param rktparlist List to extend + * @param topic Topic name (copied) + * @param start Start partition of range + * @param stop Last partition of range (inclusive) + */ +RD_EXPORT +void rd_kafka_topic_partition_list_add_range( + rd_kafka_topic_partition_list_t *rktparlist, + const char *topic, + int32_t start, + int32_t stop); + + + +/** + * @brief Delete partition from list. + * + * @param rktparlist List to modify + * @param topic Topic name to match + * @param partition Partition to match + * + * @returns 1 if partition was found (and removed), else 0. + * + * @remark Any held indices to elems[] are unusable after this call returns 1. + */ +RD_EXPORT +int rd_kafka_topic_partition_list_del( + rd_kafka_topic_partition_list_t *rktparlist, + const char *topic, + int32_t partition); + + +/** + * @brief Delete partition from list by elems[] index. + * + * @returns 1 if partition was found (and removed), else 0. + * + * @sa rd_kafka_topic_partition_list_del() + */ +RD_EXPORT +int rd_kafka_topic_partition_list_del_by_idx( + rd_kafka_topic_partition_list_t *rktparlist, + int idx); + + +/** + * @brief Make a copy of an existing list. + * + * @param src The existing list to copy. + * + * @returns A new list fully populated to be identical to \p src + */ +RD_EXPORT +rd_kafka_topic_partition_list_t * +rd_kafka_topic_partition_list_copy(const rd_kafka_topic_partition_list_t *src); + + + +/** + * @brief Set offset to \p offset for \p topic and \p partition + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or + * RD_KAFKA_RESP_ERR__UNKNOWN_PARTITION if \p partition was not found + * in the list. + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_topic_partition_list_set_offset( + rd_kafka_topic_partition_list_t *rktparlist, + const char *topic, + int32_t partition, + int64_t offset); + + + +/** + * @brief Find element by \p topic and \p partition. + * + * @returns a pointer to the first matching element, or NULL if not found. + */ +RD_EXPORT +rd_kafka_topic_partition_t *rd_kafka_topic_partition_list_find( + const rd_kafka_topic_partition_list_t *rktparlist, + const char *topic, + int32_t partition); + + +/** + * @brief Sort list using comparator \p cmp. + * + * If \p cmp is NULL the default comparator will be used that + * sorts by ascending topic name and partition. + * + * \p cmp_opaque is provided as the \p cmp_opaque argument to \p cmp. + * + */ +RD_EXPORT void rd_kafka_topic_partition_list_sort( + rd_kafka_topic_partition_list_t *rktparlist, + int (*cmp)(const void *a, const void *b, void *cmp_opaque), + void *cmp_opaque); + + +/**@}*/ + + + +/** + * @name Var-arg tag types + * @{ + * + */ + +/** + * @enum rd_kafka_vtype_t + * + * @brief Var-arg tag types + * + * @sa rd_kafka_producev() + */ +typedef enum rd_kafka_vtype_t { + RD_KAFKA_VTYPE_END, /**< va-arg sentinel */ + RD_KAFKA_VTYPE_TOPIC, /**< (const char *) Topic name */ + RD_KAFKA_VTYPE_RKT, /**< (rd_kafka_topic_t *) Topic handle */ + RD_KAFKA_VTYPE_PARTITION, /**< (int32_t) Partition */ + RD_KAFKA_VTYPE_VALUE, /**< (void *, size_t) Message value (payload)*/ + RD_KAFKA_VTYPE_KEY, /**< (void *, size_t) Message key */ + RD_KAFKA_VTYPE_OPAQUE, /**< (void *) Per-message application opaque + * value. This is the same as + * the _private field in + * rd_kafka_message_t, also known + * as the msg_opaque. */ + RD_KAFKA_VTYPE_MSGFLAGS, /**< (int) RD_KAFKA_MSG_F_.. flags */ + RD_KAFKA_VTYPE_TIMESTAMP, /**< (int64_t) Milliseconds since epoch UTC */ + RD_KAFKA_VTYPE_HEADER, /**< (const char *, const void *, ssize_t) + * Message Header */ + RD_KAFKA_VTYPE_HEADERS, /**< (rd_kafka_headers_t *) Headers list */ +} rd_kafka_vtype_t; + + +/** + * @brief VTYPE + argument container for use with rd_kafka_produce_va() + * + * See RD_KAFKA_V_..() macros below for which union field corresponds + * to which RD_KAFKA_VTYPE_... + */ +typedef struct rd_kafka_vu_s { + rd_kafka_vtype_t vtype; /**< RD_KAFKA_VTYPE_.. */ + /** Value union, see RD_KAFKA_V_.. macros for which field to use. */ + union { + const char *cstr; + rd_kafka_topic_t *rkt; + int i; + int32_t i32; + int64_t i64; + struct { + void *ptr; + size_t size; + } mem; + struct { + const char *name; + const void *val; + ssize_t size; + } header; + rd_kafka_headers_t *headers; + void *ptr; + char _pad[64]; /**< Padding size for future-proofness */ + } u; +} rd_kafka_vu_t; + +/** + * @brief Convenience macros for rd_kafka_vtype_t that takes the + * correct arguments for each vtype. + */ + +/*! + * va-arg end sentinel used to terminate the variable argument list + */ +#define RD_KAFKA_V_END RD_KAFKA_VTYPE_END + +/*! + * Topic name (const char *) + * + * rd_kafka_vu_t field: u.cstr + */ +#define RD_KAFKA_V_TOPIC(topic) \ + _LRK_TYPECHECK(RD_KAFKA_VTYPE_TOPIC, const char *, topic), \ + (const char *)topic +/*! + * Topic object (rd_kafka_topic_t *) + * + * rd_kafka_vu_t field: u.rkt + */ +#define RD_KAFKA_V_RKT(rkt) \ + _LRK_TYPECHECK(RD_KAFKA_VTYPE_RKT, rd_kafka_topic_t *, rkt), \ + (rd_kafka_topic_t *)rkt +/*! + * Partition (int32_t) + * + * rd_kafka_vu_t field: u.i32 + */ +#define RD_KAFKA_V_PARTITION(partition) \ + _LRK_TYPECHECK(RD_KAFKA_VTYPE_PARTITION, int32_t, partition), \ + (int32_t)partition +/*! + * Message value/payload pointer and length (void *, size_t) + * + * rd_kafka_vu_t fields: u.mem.ptr, u.mem.size + */ +#define RD_KAFKA_V_VALUE(VALUE, LEN) \ + _LRK_TYPECHECK2(RD_KAFKA_VTYPE_VALUE, void *, VALUE, size_t, LEN), \ + (void *)VALUE, (size_t)LEN +/*! + * Message key pointer and length (const void *, size_t) + * + * rd_kafka_vu_t field: u.mem.ptr, rd_kafka_vu.t.u.mem.size + */ +#define RD_KAFKA_V_KEY(KEY, LEN) \ + _LRK_TYPECHECK2(RD_KAFKA_VTYPE_KEY, const void *, KEY, size_t, LEN), \ + (void *)KEY, (size_t)LEN +/*! + * Message opaque pointer (void *) + * Same as \c msg_opaque, \c produce(.., msg_opaque), + * and \c rkmessage->_private . + * + * rd_kafka_vu_t field: u.ptr + */ +#define RD_KAFKA_V_OPAQUE(msg_opaque) \ + _LRK_TYPECHECK(RD_KAFKA_VTYPE_OPAQUE, void *, msg_opaque), \ + (void *)msg_opaque +/*! + * Message flags (int) + * @sa RD_KAFKA_MSG_F_COPY, et.al. + * + * rd_kafka_vu_t field: u.i + */ +#define RD_KAFKA_V_MSGFLAGS(msgflags) \ + _LRK_TYPECHECK(RD_KAFKA_VTYPE_MSGFLAGS, int, msgflags), (int)msgflags +/*! + * Timestamp in milliseconds since epoch UTC (int64_t). + * A value of 0 will use the current wall-clock time. + * + * rd_kafka_vu_t field: u.i64 + */ +#define RD_KAFKA_V_TIMESTAMP(timestamp) \ + _LRK_TYPECHECK(RD_KAFKA_VTYPE_TIMESTAMP, int64_t, timestamp), \ + (int64_t)timestamp +/*! + * Add Message Header (const char *NAME, const void *VALUE, ssize_t LEN). + * @sa rd_kafka_header_add() + * @remark RD_KAFKA_V_HEADER() and RD_KAFKA_V_HEADERS() MUST NOT be mixed + * in the same call to producev(). + * + * rd_kafka_vu_t fields: u.header.name, u.header.val, u.header.size + */ +#define RD_KAFKA_V_HEADER(NAME, VALUE, LEN) \ + _LRK_TYPECHECK3(RD_KAFKA_VTYPE_HEADER, const char *, NAME, \ + const void *, VALUE, ssize_t, LEN), \ + (const char *)NAME, (const void *)VALUE, (ssize_t)LEN + +/*! + * Message Headers list (rd_kafka_headers_t *). + * The message object will assume ownership of the headers (unless producev() + * fails). + * Any existing headers will be replaced. + * @sa rd_kafka_message_set_headers() + * @remark RD_KAFKA_V_HEADER() and RD_KAFKA_V_HEADERS() MUST NOT be mixed + * in the same call to producev(). + * + * rd_kafka_vu_t fields: u.headers + */ +#define RD_KAFKA_V_HEADERS(HDRS) \ + _LRK_TYPECHECK(RD_KAFKA_VTYPE_HEADERS, rd_kafka_headers_t *, HDRS), \ + (rd_kafka_headers_t *)HDRS + + +/**@}*/ + + +/** + * @name Message headers + * @{ + * + * @brief Message headers consist of a list of (string key, binary value) pairs. + * Duplicate keys are supported and the order in which keys were + * added are retained. + * + * Header values are considered binary and may have three types of + * value: + * - proper value with size > 0 and a valid pointer + * - empty value with size = 0 and any non-NULL pointer + * - null value with size = 0 and a NULL pointer + * + * Headers require Apache Kafka broker version v0.11.0.0 or later. + * + * Header operations are O(n). + */ + + +/** + * @brief Create a new headers list. + * + * @param initial_count Preallocate space for this number of headers. + * Any number of headers may be added, updated and + * removed regardless of the initial count. + */ +RD_EXPORT rd_kafka_headers_t *rd_kafka_headers_new(size_t initial_count); + +/** + * @brief Destroy the headers list. The object and any returned value pointers + * are not usable after this call. + */ +RD_EXPORT void rd_kafka_headers_destroy(rd_kafka_headers_t *hdrs); + +/** + * @brief Make a copy of headers list \p src. + */ +RD_EXPORT rd_kafka_headers_t * +rd_kafka_headers_copy(const rd_kafka_headers_t *src); + +/** + * @brief Add header with name \p name and value \p val (copied) of size + * \p size (not including null-terminator). + * + * @param hdrs Headers list. + * @param name Header name. + * @param name_size Header name size (not including the null-terminator). + * If -1 the \p name length is automatically acquired using + * strlen(). + * @param value Pointer to header value, or NULL (set size to 0 or -1). + * @param value_size Size of header value. If -1 the \p value is assumed to be a + * null-terminated string and the length is automatically + * acquired using strlen(). + * + * @returns RD_KAFKA_RESP_ERR__READ_ONLY if the headers are read-only, + * else RD_KAFKA_RESP_ERR_NO_ERROR. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_header_add(rd_kafka_headers_t *hdrs, + const char *name, + ssize_t name_size, + const void *value, + ssize_t value_size); + +/** + * @brief Remove all headers for the given key (if any). + * + * @returns RD_KAFKA_RESP_ERR__READ_ONLY if the headers are read-only, + * RD_KAFKA_RESP_ERR__NOENT if no matching headers were found, + * else RD_KAFKA_RESP_ERR_NO_ERROR if headers were removed. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_header_remove(rd_kafka_headers_t *hdrs, + const char *name); + + +/** + * @brief Find last header in list \p hdrs matching \p name. + * + * @param hdrs Headers list. + * @param name Header to find (last match). + * @param valuep (out) Set to a (null-terminated) const pointer to the value + * (may be NULL). + * @param sizep (out) Set to the value's size (not including null-terminator). + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR if an entry was found, else + * RD_KAFKA_RESP_ERR__NOENT. + * + * @remark The returned pointer in \p valuep includes a trailing null-terminator + * that is not accounted for in \p sizep. + * @remark The returned pointer is only valid as long as the headers list and + * the header item is valid. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_header_get_last(const rd_kafka_headers_t *hdrs, + const char *name, + const void **valuep, + size_t *sizep); + +/** + * @brief Iterator for headers matching \p name. + * + * Same semantics as rd_kafka_header_get_last() + * + * @param hdrs Headers to iterate. + * @param idx Iterator index, start at 0 and increment by one for each call + * as long as RD_KAFKA_RESP_ERR_NO_ERROR is returned. + * @param name Header name to match. + * @param valuep (out) Set to a (null-terminated) const pointer to the value + * (may be NULL). + * @param sizep (out) Set to the value's size (not including null-terminator). + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_header_get(const rd_kafka_headers_t *hdrs, + size_t idx, + const char *name, + const void **valuep, + size_t *sizep); + + +/** + * @brief Iterator for all headers. + * + * Same semantics as rd_kafka_header_get() + * + * @sa rd_kafka_header_get() + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_header_get_all(const rd_kafka_headers_t *hdrs, + size_t idx, + const char **namep, + const void **valuep, + size_t *sizep); + + + +/**@}*/ + + + +/** + * @name Kafka messages + * @{ + * + */ + + + +// FIXME: This doesn't show up in docs for some reason +// "Compound rd_kafka_message_t is not documented." + +/** + * @brief A Kafka message as returned by the \c rd_kafka_consume*() family + * of functions as well as provided to the Producer \c dr_msg_cb(). + * + * For the consumer this object has two purposes: + * - provide the application with a consumed message. (\c err == 0) + * - report per-topic+partition consumer errors (\c err != 0) + * + * The application must check \c err to decide what action to take. + * + * When the application is finished with a message it must call + * rd_kafka_message_destroy() unless otherwise noted. + */ +typedef struct rd_kafka_message_s { + rd_kafka_resp_err_t err; /**< Non-zero for error signaling. */ + rd_kafka_topic_t *rkt; /**< Topic */ + int32_t partition; /**< Partition */ + void *payload; /**< Producer: original message payload. + * Consumer: Depends on the value of \c err : + * - \c err==0: Message payload. + * - \c err!=0: Error string */ + size_t len; /**< Depends on the value of \c err : + * - \c err==0: Message payload length + * - \c err!=0: Error string length */ + void *key; /**< Depends on the value of \c err : + * - \c err==0: Optional message key */ + size_t key_len; /**< Depends on the value of \c err : + * - \c err==0: Optional message key length*/ + int64_t offset; /**< Consumer: + * - Message offset (or offset for error + * if \c err!=0 if applicable). + * Producer, dr_msg_cb: + * Message offset assigned by broker. + * May be RD_KAFKA_OFFSET_INVALID + * for retried messages when + * idempotence is enabled. */ + void *_private; /**< Consumer: + * - rdkafka private pointer: + * DO NOT MODIFY, DO NOT COPY. + * Producer: + * - dr_msg_cb: + * msg_opaque from produce() call or + * RD_KAFKA_V_OPAQUE from producev(). */ +} rd_kafka_message_t; + + +/** + * @brief Frees resources for \p rkmessage and hands ownership back to rdkafka. + */ +RD_EXPORT +void rd_kafka_message_destroy(rd_kafka_message_t *rkmessage); + + + +/** + * @brief Returns the error string for an errored rd_kafka_message_t or NULL if + * there was no error. + * + * @remark This function MUST NOT be used with the producer. + */ +RD_EXPORT +const char *rd_kafka_message_errstr(const rd_kafka_message_t *rkmessage); + + +/** + * @brief Returns the message timestamp for a consumed message. + * + * The timestamp is the number of milliseconds since the epoch (UTC). + * + * \p tstype (if not NULL) is updated to indicate the type of timestamp. + * + * @returns message timestamp, or -1 if not available. + * + * @remark Message timestamps require broker version 0.10.0 or later. + */ +RD_EXPORT +int64_t rd_kafka_message_timestamp(const rd_kafka_message_t *rkmessage, + rd_kafka_timestamp_type_t *tstype); + + + +/** + * @brief Returns the latency for a produced message measured from + * the produce() call. + * + * @returns the latency in microseconds, or -1 if not available. + */ +RD_EXPORT +int64_t rd_kafka_message_latency(const rd_kafka_message_t *rkmessage); + + +/** + * @brief Returns the broker id of the broker the message was produced to + * or fetched from. + * + * @returns a broker id if known, else -1. + */ +RD_EXPORT +int32_t rd_kafka_message_broker_id(const rd_kafka_message_t *rkmessage); + + +/** + * @brief Get the message header list. + * + * The returned pointer in \p *hdrsp is associated with the \p rkmessage and + * must not be used after destruction of the message object or the header + * list is replaced with rd_kafka_message_set_headers(). + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR if headers were returned, + * RD_KAFKA_RESP_ERR__NOENT if the message has no headers, + * or another error code if the headers could not be parsed. + * + * @remark Headers require broker version 0.11.0.0 or later. + * + * @remark As an optimization the raw protocol headers are parsed on + * the first call to this function. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_message_headers(const rd_kafka_message_t *rkmessage, + rd_kafka_headers_t **hdrsp); + +/** + * @brief Get the message header list and detach the list from the message + * making the application the owner of the headers. + * The application must eventually destroy the headers using + * rd_kafka_headers_destroy(). + * The message's headers will be set to NULL. + * + * Otherwise same semantics as rd_kafka_message_headers() + * + * @sa rd_kafka_message_headers + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_message_detach_headers(rd_kafka_message_t *rkmessage, + rd_kafka_headers_t **hdrsp); + + +/** + * @brief Replace the message's current headers with a new list. + * + * @param rkmessage The message to set headers. + * @param hdrs New header list. The message object assumes ownership of + * the list, the list will be destroyed automatically with + * the message object. + * The new headers list may be updated until the message object + * is passed or returned to librdkafka. + * + * @remark The existing headers object, if any, will be destroyed. + */ +RD_EXPORT +void rd_kafka_message_set_headers(rd_kafka_message_t *rkmessage, + rd_kafka_headers_t *hdrs); + + +/** + * @brief Returns the number of header key/value pairs + * + * @param hdrs Headers to count + */ +RD_EXPORT size_t rd_kafka_header_cnt(const rd_kafka_headers_t *hdrs); + + +/** + * @enum rd_kafka_msg_status_t + * @brief Message persistence status can be used by the application to + * find out if a produced message was persisted in the topic log. + */ +typedef enum { + /** Message was never transmitted to the broker, or failed with + * an error indicating it was not written to the log. + * Application retry risks ordering, but not duplication. */ + RD_KAFKA_MSG_STATUS_NOT_PERSISTED = 0, + + /** Message was transmitted to broker, but no acknowledgement was + * received. + * Application retry risks ordering and duplication. */ + RD_KAFKA_MSG_STATUS_POSSIBLY_PERSISTED = 1, + + /** Message was written to the log and acknowledged by the broker. + * No reason for application to retry. + * Note: this value should only be trusted with \c acks=all. */ + RD_KAFKA_MSG_STATUS_PERSISTED = 2 +} rd_kafka_msg_status_t; + + +/** + * @brief Returns the message's persistence status in the topic log. + * + * @remark The message status is not available in on_acknowledgement + * interceptors. + */ +RD_EXPORT rd_kafka_msg_status_t +rd_kafka_message_status(const rd_kafka_message_t *rkmessage); + + +/** + * @returns the message's partition leader epoch at the time the message was + * fetched and if known, else -1. + * + * @remark This API must only be used on consumed messages without error. + * @remark Requires broker version >= 2.10 (KIP-320). + */ +RD_EXPORT int32_t +rd_kafka_message_leader_epoch(const rd_kafka_message_t *rkmessage); + + +/**@}*/ + + +/** + * @name Configuration interface + * @{ + * + * @brief Main/global configuration property interface + * + */ + +/** + * @enum rd_kafka_conf_res_t + * @brief Configuration result type + */ +typedef enum { + RD_KAFKA_CONF_UNKNOWN = -2, /**< Unknown configuration name. */ + RD_KAFKA_CONF_INVALID = -1, /**< Invalid configuration value or + * property or value not supported in + * this build. */ + RD_KAFKA_CONF_OK = 0 /**< Configuration okay */ +} rd_kafka_conf_res_t; + + +/** + * @brief Create configuration object. + * + * When providing your own configuration to the \c rd_kafka_*_new_*() calls + * the rd_kafka_conf_t objects needs to be created with this function + * which will set up the defaults. + * I.e.: + * @code + * rd_kafka_conf_t *myconf; + * rd_kafka_conf_res_t res; + * + * myconf = rd_kafka_conf_new(); + * res = rd_kafka_conf_set(myconf, "socket.timeout.ms", "600", + * errstr, sizeof(errstr)); + * if (res != RD_KAFKA_CONF_OK) + * die("%s\n", errstr); + * + * rk = rd_kafka_new(..., myconf); + * @endcode + * + * Please see CONFIGURATION.md for the default settings or use + * rd_kafka_conf_properties_show() to provide the information at runtime. + * + * The properties are identical to the Apache Kafka configuration properties + * whenever possible. + * + * @remark A successful call to rd_kafka_new() will assume ownership of + * the conf object and rd_kafka_conf_destroy() must not be called. + * + * @returns A new rd_kafka_conf_t object with defaults set. + * + * @sa rd_kafka_new(), rd_kafka_conf_set(), rd_kafka_conf_destroy() + */ +RD_EXPORT +rd_kafka_conf_t *rd_kafka_conf_new(void); + + +/** + * @brief Destroys a conf object. + */ +RD_EXPORT +void rd_kafka_conf_destroy(rd_kafka_conf_t *conf); + + +/** + * @brief Creates a copy/duplicate of configuration object \p conf + * + * @remark Interceptors are NOT copied to the new configuration object. + * @sa rd_kafka_interceptor_f_on_conf_dup + */ +RD_EXPORT +rd_kafka_conf_t *rd_kafka_conf_dup(const rd_kafka_conf_t *conf); + + +/** + * @brief Same as rd_kafka_conf_dup() but with an array of property name + * prefixes to filter out (ignore) when copying. + */ +RD_EXPORT +rd_kafka_conf_t *rd_kafka_conf_dup_filter(const rd_kafka_conf_t *conf, + size_t filter_cnt, + const char **filter); + + + +/** + * @returns the configuration object used by an rd_kafka_t instance. + * For use with rd_kafka_conf_get(), et.al., to extract configuration + * properties from a running client. + * + * @remark the returned object is read-only and its lifetime is the same + * as the rd_kafka_t object. + */ +RD_EXPORT +const rd_kafka_conf_t *rd_kafka_conf(rd_kafka_t *rk); + + +/** + * @brief Sets a configuration property. + * + * \p conf must have been previously created with rd_kafka_conf_new(). + * + * Fallthrough: + * Topic-level configuration properties may be set using this interface + * in which case they are applied on the \c default_topic_conf. + * If no \c default_topic_conf has been set one will be created. + * Any subsequent rd_kafka_conf_set_default_topic_conf() calls will + * replace the current default topic configuration. + * + * @returns \c rd_kafka_conf_res_t to indicate success or failure. + * In case of failure \p errstr is updated to contain a human readable + * error string. + * + * @remark Setting properties or values that were disabled at build time due to + * missing dependencies will return RD_KAFKA_CONF_INVALID. + */ +RD_EXPORT +rd_kafka_conf_res_t rd_kafka_conf_set(rd_kafka_conf_t *conf, + const char *name, + const char *value, + char *errstr, + size_t errstr_size); + + +/** + * @brief Enable event sourcing. + * \p events is a bitmask of \c RD_KAFKA_EVENT_* of events to enable + * for consumption by `rd_kafka_queue_poll()`. + */ +RD_EXPORT +void rd_kafka_conf_set_events(rd_kafka_conf_t *conf, int events); + + +/** + * @brief Generic event callback to be used with the event API to trigger + * callbacks for \c rd_kafka_event_t objects from a background + * thread serving the background queue. + * + * How to use: + * 1. First set the event callback on the configuration object with this + * function, followed by creating an rd_kafka_t instance + * with rd_kafka_new(). + * 2. Get the instance's background queue with rd_kafka_queue_get_background() + * and pass it as the reply/response queue to an API that takes an + * event queue, such as rd_kafka_CreateTopics(). + * 3. As the response event is ready and enqueued on the background queue the + * event callback will be triggered from the background thread. + * 4. Prior to destroying the client instance, loose your reference to the + * background queue by calling rd_kafka_queue_destroy(). + * + * The application must destroy the \c rkev passed to \p event cb using + * rd_kafka_event_destroy(). + * + * The \p event_cb \c opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + * + * @remark This callback is a specialized alternative to the poll-based + * event API described in the Event interface section. + * + * @remark The \p event_cb will be called spontaneously from a background + * thread completely managed by librdkafka. + * Take care to perform proper locking of application objects. + * + * @warning The application MUST NOT call rd_kafka_destroy() from the + * event callback. + * + * @sa rd_kafka_queue_get_background + */ +RD_EXPORT void rd_kafka_conf_set_background_event_cb( + rd_kafka_conf_t *conf, + void (*event_cb)(rd_kafka_t *rk, rd_kafka_event_t *rkev, void *opaque)); + + +/** + * @deprecated See rd_kafka_conf_set_dr_msg_cb() + */ +RD_EXPORT +void rd_kafka_conf_set_dr_cb(rd_kafka_conf_t *conf, + void (*dr_cb)(rd_kafka_t *rk, + void *payload, + size_t len, + rd_kafka_resp_err_t err, + void *opaque, + void *msg_opaque)); + +/** + * @brief \b Producer: Set delivery report callback in provided \p conf object. + * + * The delivery report callback will be called once for each message + * accepted by rd_kafka_produce() (et.al) with \p err set to indicate + * the result of the produce request. + * + * The callback is called when a message is succesfully produced or + * if librdkafka encountered a permanent failure. + * Delivery errors occur when the retry count is exceeded, when the + * message.timeout.ms timeout is exceeded or there is a permanent error + * like RD_KAFKA_RESP_ERR_UNKNOWN_TOPIC_OR_PART. + * + * An application must call rd_kafka_poll() at regular intervals to + * serve queued delivery report callbacks. + * + * The broker-assigned offset can be retrieved with \c rkmessage->offset + * and the timestamp can be retrieved using rd_kafka_message_timestamp(). + * + * The \p dr_msg_cb \c opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + * The per-message msg_opaque value is available in + * \c rd_kafka_message_t._private. + * + * @remark The Idempotent Producer may return invalid timestamp + * (RD_KAFKA_TIMESTAMP_NOT_AVAILABLE), and + * and offset (RD_KAFKA_OFFSET_INVALID) for retried messages + * that were previously successfully delivered but not properly + * acknowledged. + */ +RD_EXPORT +void rd_kafka_conf_set_dr_msg_cb( + rd_kafka_conf_t *conf, + void (*dr_msg_cb)(rd_kafka_t *rk, + const rd_kafka_message_t *rkmessage, + void *opaque)); + + +/** + * @brief \b Consumer: Set consume callback for use with + * rd_kafka_consumer_poll() + * + * The \p consume_cb \p opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + */ +RD_EXPORT +void rd_kafka_conf_set_consume_cb( + rd_kafka_conf_t *conf, + void (*consume_cb)(rd_kafka_message_t *rkmessage, void *opaque)); + +/** + * @brief \b Consumer: Set rebalance callback for use with + * coordinated consumer group balancing. + * + * The \p err field is set to either RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS + * or RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS and 'partitions' + * contains the full partition set that was either assigned or revoked. + * + * Registering a \p rebalance_cb turns off librdkafka's automatic + * partition assignment/revocation and instead delegates that responsibility + * to the application's \p rebalance_cb. + * + * The rebalance callback is responsible for updating librdkafka's + * assignment set based on the two events: RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS + * and RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS but should also be able to handle + * arbitrary rebalancing failures where \p err is neither of those. + * @remark In this latter case (arbitrary error), the application must + * call rd_kafka_assign(rk, NULL) to synchronize state. + * + * For eager/non-cooperative `partition.assignment.strategy` assignors, + * such as `range` and `roundrobin`, the application must use + * rd_kafka_assign() to set or clear the entire assignment. + * For the cooperative assignors, such as `cooperative-sticky`, the application + * must use rd_kafka_incremental_assign() for + * RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS and rd_kafka_incremental_unassign() + * for RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS. + * + * Without a rebalance callback this is done automatically by librdkafka + * but registering a rebalance callback gives the application flexibility + * in performing other operations along with the assigning/revocation, + * such as fetching offsets from an alternate location (on assign) + * or manually committing offsets (on revoke). + * + * rebalance_cb is always triggered exactly once when a rebalance completes + * with a new assignment, even if that assignment is empty. If an + * eager/non-cooperative assignor is configured, there will eventually be + * exactly one corresponding call to rebalance_cb to revoke these partitions + * (even if empty), whether this is due to a group rebalance or lost + * partitions. In the cooperative case, rebalance_cb will never be called if + * the set of partitions being revoked is empty (whether or not lost). + * + * The callback's \p opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + * + * @remark The \p partitions list is destroyed by librdkafka on return + * return from the rebalance_cb and must not be freed or + * saved by the application. + * + * @remark Be careful when modifying the \p partitions list. + * Changing this list should only be done to change the initial + * offsets for each partition. + * But a function like `rd_kafka_position()` might have unexpected + * effects for instance when a consumer gets assigned a partition + * it used to consume at an earlier rebalance. In this case, the + * list of partitions will be updated with the old offset for that + * partition. In this case, it is generally better to pass a copy + * of the list (see `rd_kafka_topic_partition_list_copy()`). + * The result of `rd_kafka_position()` is typically outdated in + * RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS. + * + * @sa rd_kafka_assign() + * @sa rd_kafka_incremental_assign() + * @sa rd_kafka_incremental_unassign() + * @sa rd_kafka_assignment_lost() + * @sa rd_kafka_rebalance_protocol() + * + * The following example shows the application's responsibilities: + * @code + * static void rebalance_cb (rd_kafka_t *rk, rd_kafka_resp_err_t err, + * rd_kafka_topic_partition_list_t *partitions, + * void *opaque) { + * + * switch (err) + * { + * case RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS: + * // application may load offets from arbitrary external + * // storage here and update \p partitions + * if (!strcmp(rd_kafka_rebalance_protocol(rk), "COOPERATIVE")) + * rd_kafka_incremental_assign(rk, partitions); + * else // EAGER + * rd_kafka_assign(rk, partitions); + * break; + * + * case RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS: + * if (manual_commits) // Optional explicit manual commit + * rd_kafka_commit(rk, partitions, 0); // sync commit + * + * if (!strcmp(rd_kafka_rebalance_protocol(rk), "COOPERATIVE")) + * rd_kafka_incremental_unassign(rk, partitions); + * else // EAGER + * rd_kafka_assign(rk, NULL); + * break; + * + * default: + * handle_unlikely_error(err); + * rd_kafka_assign(rk, NULL); // sync state + * break; + * } + * } + * @endcode + * + * @remark The above example lacks error handling for assign calls, see + * the examples/ directory. + */ +RD_EXPORT +void rd_kafka_conf_set_rebalance_cb( + rd_kafka_conf_t *conf, + void (*rebalance_cb)(rd_kafka_t *rk, + rd_kafka_resp_err_t err, + rd_kafka_topic_partition_list_t *partitions, + void *opaque)); + + + +/** + * @brief \b Consumer: Set offset commit callback for use with consumer groups. + * + * The results of automatic or manual offset commits will be scheduled + * for this callback and is served by rd_kafka_consumer_poll(). + * + * If no partitions had valid offsets to commit this callback will be called + * with \p err == RD_KAFKA_RESP_ERR__NO_OFFSET which is not to be considered + * an error. + * + * The \p offsets list contains per-partition information: + * - \c offset: committed offset (attempted) + * - \c err: commit error + * + * The callback's \p opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + */ +RD_EXPORT +void rd_kafka_conf_set_offset_commit_cb( + rd_kafka_conf_t *conf, + void (*offset_commit_cb)(rd_kafka_t *rk, + rd_kafka_resp_err_t err, + rd_kafka_topic_partition_list_t *offsets, + void *opaque)); + + +/** + * @brief Set error callback in provided conf object. + * + * The error callback is used by librdkafka to signal warnings and errors + * back to the application. + * + * These errors should generally be considered informational and non-permanent, + * the client will try to recover automatically from all type of errors. + * Given that the client and cluster configuration is correct the + * application should treat these as temporary errors. + * + * \p error_cb will be triggered with \c err set to RD_KAFKA_RESP_ERR__FATAL + * if a fatal error has been raised; in this case use rd_kafka_fatal_error() to + * retrieve the fatal error code and error string, and then begin terminating + * the client instance. + * + * If no \p error_cb is registered, or RD_KAFKA_EVENT_ERROR has not been set + * with rd_kafka_conf_set_events, then the errors will be logged instead. + * + * The callback's \p opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + */ +RD_EXPORT +void rd_kafka_conf_set_error_cb(rd_kafka_conf_t *conf, + void (*error_cb)(rd_kafka_t *rk, + int err, + const char *reason, + void *opaque)); + +/** + * @brief Set throttle callback. + * + * The throttle callback is used to forward broker throttle times to the + * application for Produce and Fetch (consume) requests. + * + * Callbacks are triggered whenever a non-zero throttle time is returned by + * the broker, or when the throttle time drops back to zero. + * + * An application must call rd_kafka_poll() or rd_kafka_consumer_poll() at + * regular intervals to serve queued callbacks. + * + * The callback's \p opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + * + * @remark Requires broker version 0.9.0 or later. + */ +RD_EXPORT +void rd_kafka_conf_set_throttle_cb(rd_kafka_conf_t *conf, + void (*throttle_cb)(rd_kafka_t *rk, + const char *broker_name, + int32_t broker_id, + int throttle_time_ms, + void *opaque)); + + +/** + * @brief Set logger callback. + * + * The default is to print to stderr, but a syslog logger is also available, + * see rd_kafka_log_print and rd_kafka_log_syslog for the builtin alternatives. + * Alternatively the application may provide its own logger callback. + * Or pass \p func as NULL to disable logging. + * + * This is the configuration alternative to the deprecated rd_kafka_set_logger() + * + * @remark The log_cb will be called spontaneously from librdkafka's internal + * threads unless logs have been forwarded to a poll queue through + * \c rd_kafka_set_log_queue(). + * An application MUST NOT call any librdkafka APIs or do any prolonged + * work in a non-forwarded \c log_cb. + */ +RD_EXPORT +void rd_kafka_conf_set_log_cb(rd_kafka_conf_t *conf, + void (*log_cb)(const rd_kafka_t *rk, + int level, + const char *fac, + const char *buf)); + + +/** + * @brief Set statistics callback in provided conf object. + * + * The statistics callback is triggered from rd_kafka_poll() every + * \c statistics.interval.ms (needs to be configured separately). + * Function arguments: + * - \p rk - Kafka handle + * - \p json - String containing the statistics data in JSON format + * - \p json_len - Length of \p json string. + * - \p opaque - Application-provided opaque as set by + * rd_kafka_conf_set_opaque(). + * + * For more information on the format of \p json, see + * https://github.com/edenhill/librdkafka/wiki/Statistics + * + * If the application wishes to hold on to the \p json pointer and free + * it at a later time it must return 1 from the \p stats_cb. + * If the application returns 0 from the \p stats_cb then librdkafka + * will immediately free the \p json pointer. + * + * See STATISTICS.md for a full definition of the JSON object. + */ +RD_EXPORT +void rd_kafka_conf_set_stats_cb( + rd_kafka_conf_t *conf, + int (*stats_cb)(rd_kafka_t *rk, char *json, size_t json_len, void *opaque)); + +/** + * @brief Set SASL/OAUTHBEARER token refresh callback in provided conf object. + * + * @param conf the configuration to mutate. + * @param oauthbearer_token_refresh_cb the callback to set; callback function + * arguments:<br> + * \p rk - Kafka handle<br> + * \p oauthbearer_config - Value of configuration property + * sasl.oauthbearer.config. + * \p opaque - Application-provided opaque set via + * rd_kafka_conf_set_opaque() + * + * The SASL/OAUTHBEARER token refresh callback is triggered via rd_kafka_poll() + * whenever OAUTHBEARER is the SASL mechanism and a token needs to be retrieved, + * typically based on the configuration defined in \c sasl.oauthbearer.config. + * + * The callback should invoke rd_kafka_oauthbearer_set_token() + * or rd_kafka_oauthbearer_set_token_failure() to indicate success + * or failure, respectively. + * + * The refresh operation is eventable and may be received via + * rd_kafka_queue_poll() with an event type of + * \c RD_KAFKA_EVENT_OAUTHBEARER_TOKEN_REFRESH. + * + * Note that before any SASL/OAUTHBEARER broker connection can succeed the + * application must call rd_kafka_oauthbearer_set_token() once -- either + * directly or, more typically, by invoking either rd_kafka_poll(), + * rd_kafka_consumer_poll(), rd_kafka_queue_poll(), etc, in order to cause + * retrieval of an initial token to occur. + * + * Alternatively, the application can enable the SASL queue by calling + * rd_kafka_conf_enable_sasl_queue() on the configuration object prior to + * creating the client instance, get the SASL queue with + * rd_kafka_queue_get_sasl(), and either serve the queue manually by calling + * rd_kafka_queue_poll(), or redirecting the queue to the background thread to + * have the queue served automatically. For the latter case the SASL queue + * must be forwarded to the background queue with rd_kafka_queue_forward(). + * A convenience function is available to automatically forward the SASL queue + * to librdkafka's background thread, see + * rd_kafka_sasl_background_callbacks_enable(). + * + * An unsecured JWT refresh handler is provided by librdkafka for development + * and testing purposes, it is enabled by setting + * the \c enable.sasl.oauthbearer.unsecure.jwt property to true and is + * mutually exclusive to using a refresh callback. + * + * @sa rd_kafka_sasl_background_callbacks_enable() + * @sa rd_kafka_queue_get_sasl() + */ +RD_EXPORT +void rd_kafka_conf_set_oauthbearer_token_refresh_cb( + rd_kafka_conf_t *conf, + void (*oauthbearer_token_refresh_cb)(rd_kafka_t *rk, + const char *oauthbearer_config, + void *opaque)); + +/** + * @brief Enable/disable creation of a queue specific to SASL events + * and callbacks. + * + * For SASL mechanisms that trigger callbacks (currently OAUTHBEARER) this + * configuration API allows an application to get a dedicated + * queue for the SASL events/callbacks. After enabling the queue with this API + * the application can retrieve the queue by calling + * rd_kafka_queue_get_sasl() on the client instance. + * This queue may then be served directly by the application + * (with rd_kafka_queue_poll(), et.al) or forwarded to another queue, such as + * the background queue. + * + * A convenience function is available to automatically forward the SASL queue + * to librdkafka's background thread, see + * rd_kafka_sasl_background_callbacks_enable(). + * + * By default (\p enable = 0) the main queue (as served by rd_kafka_poll(), + * et.al.) is used for SASL callbacks. + * + * @remark The SASL queue is currently only used by the SASL OAUTHBEARER + * mechanism's token_refresh_cb(). + * + * @sa rd_kafka_queue_get_sasl() + * @sa rd_kafka_sasl_background_callbacks_enable() + */ + +RD_EXPORT +void rd_kafka_conf_enable_sasl_queue(rd_kafka_conf_t *conf, int enable); + + +/** + * @brief Set socket callback. + * + * The socket callback is responsible for opening a socket + * according to the supplied \p domain, \p type and \p protocol. + * The socket shall be created with \c CLOEXEC set in a racefree fashion, if + * possible. + * + * The callback's \p opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + * + * Default: + * - on linux: racefree CLOEXEC + * - others : non-racefree CLOEXEC + * + * @remark The callback will be called from an internal librdkafka thread. + */ +RD_EXPORT +void rd_kafka_conf_set_socket_cb( + rd_kafka_conf_t *conf, + int (*socket_cb)(int domain, int type, int protocol, void *opaque)); + + + +/** + * @brief Set connect callback. + * + * The connect callback is responsible for connecting socket \p sockfd + * to peer address \p addr. + * The \p id field contains the broker identifier. + * + * \p connect_cb shall return 0 on success (socket connected) or an error + * number (errno) on error. + * + * The callback's \p opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + * + * @remark The callback will be called from an internal librdkafka thread. + */ +RD_EXPORT void +rd_kafka_conf_set_connect_cb(rd_kafka_conf_t *conf, + int (*connect_cb)(int sockfd, + const struct sockaddr *addr, + int addrlen, + const char *id, + void *opaque)); + +/** + * @brief Set close socket callback. + * + * Close a socket (optionally opened with socket_cb()). + * + * The callback's \p opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + * + * @remark The callback will be called from an internal librdkafka thread. + */ +RD_EXPORT void rd_kafka_conf_set_closesocket_cb( + rd_kafka_conf_t *conf, + int (*closesocket_cb)(int sockfd, void *opaque)); + + + +#ifndef _WIN32 +/** + * @brief Set open callback. + * + * The open callback is responsible for opening the file specified by + * pathname, flags and mode. + * The file shall be opened with \c CLOEXEC set in a racefree fashion, if + * possible. + * + * Default: + * - on linux: racefree CLOEXEC + * - others : non-racefree CLOEXEC + * + * The callback's \p opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + * + * @remark The callback will be called from an internal librdkafka thread. + */ +RD_EXPORT +void rd_kafka_conf_set_open_cb( + rd_kafka_conf_t *conf, + int (*open_cb)(const char *pathname, int flags, mode_t mode, void *opaque)); +#endif + +/** Forward declaration to avoid netdb.h or winsock includes */ +struct addrinfo; + +/** + * @brief Set address resolution callback. + * + * The callback is responsible for resolving the hostname \p node and the + * service \p service into a list of socket addresses as \c getaddrinfo(3) + * would. The \p hints and \p res parameters function as they do for + * \c getaddrinfo(3). The callback's \p opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + * + * If the callback is invoked with a NULL \p node, \p service, and \p hints, the + * callback should instead free the addrinfo struct specified in \p res. In this + * case the callback must succeed; the return value will not be checked by the + * caller. + * + * The callback's return value is interpreted as the return value of \p + * \c getaddrinfo(3). + * + * @remark The callback will be called from an internal librdkafka thread. + */ +RD_EXPORT void +rd_kafka_conf_set_resolve_cb(rd_kafka_conf_t *conf, + int (*resolve_cb)(const char *node, + const char *service, + const struct addrinfo *hints, + struct addrinfo **res, + void *opaque)); + +/** + * @brief Sets the verification callback of the broker certificate + * + * The verification callback is triggered from internal librdkafka threads + * upon connecting to a broker. On each connection attempt the callback + * will be called for each certificate in the broker's certificate chain, + * starting at the root certification, as long as the application callback + * returns 1 (valid certificate). + * \c broker_name and \c broker_id correspond to the broker the connection + * is being made to. + * The \c x509_error argument indicates if OpenSSL's verification of + * the certificate succeed (0) or failed (an OpenSSL error code). + * The application may set the SSL context error code by returning 0 + * from the verify callback and providing a non-zero SSL context error code + * in \c x509_error. + * If the verify callback sets \c x509_error to 0, returns 1, and the + * original \c x509_error was non-zero, the error on the SSL context will + * be cleared. + * \c x509_error is always a valid pointer to an int. + * + * \c depth is the depth of the current certificate in the chain, starting + * at the root certificate. + * + * The certificate itself is passed in binary DER format in \c buf of + * size \c size. + * + * The callback must return 1 if verification succeeds, or + * 0 if verification fails and then write a human-readable error message + * to \c errstr (limited to \c errstr_size bytes, including nul-term). + * + * The callback's \p opaque argument is the opaque set with + * rd_kafka_conf_set_opaque(). + * + * @returns RD_KAFKA_CONF_OK if SSL is supported in this build, else + * RD_KAFKA_CONF_INVALID. + * + * @warning This callback will be called from internal librdkafka threads. + * + * @remark See <openssl/x509_vfy.h> in the OpenSSL source distribution + * for a list of \p x509_error codes. + */ +RD_EXPORT +rd_kafka_conf_res_t rd_kafka_conf_set_ssl_cert_verify_cb( + rd_kafka_conf_t *conf, + int (*ssl_cert_verify_cb)(rd_kafka_t *rk, + const char *broker_name, + int32_t broker_id, + int *x509_error, + int depth, + const char *buf, + size_t size, + char *errstr, + size_t errstr_size, + void *opaque)); + + +/** + * @enum rd_kafka_cert_type_t + * + * @brief SSL certificate type + * + * @sa rd_kafka_conf_set_ssl_cert + */ +typedef enum rd_kafka_cert_type_t { + RD_KAFKA_CERT_PUBLIC_KEY, /**< Client's public key */ + RD_KAFKA_CERT_PRIVATE_KEY, /**< Client's private key */ + RD_KAFKA_CERT_CA, /**< CA certificate */ + RD_KAFKA_CERT__CNT, +} rd_kafka_cert_type_t; + +/** + * @enum rd_kafka_cert_enc_t + * + * @brief SSL certificate encoding + * + * @sa rd_kafka_conf_set_ssl_cert + */ +typedef enum rd_kafka_cert_enc_t { + RD_KAFKA_CERT_ENC_PKCS12, /**< PKCS#12 */ + RD_KAFKA_CERT_ENC_DER, /**< DER / binary X.509 ASN1 */ + RD_KAFKA_CERT_ENC_PEM, /**< PEM */ + RD_KAFKA_CERT_ENC__CNT, +} rd_kafka_cert_enc_t; + + +/** + * @brief Set certificate/key \p cert_type from the \p cert_enc encoded + * memory at \p buffer of \p size bytes. + * + * @param conf Configuration object. + * @param cert_type Certificate or key type to configure. + * @param cert_enc Buffer \p encoding type. + * @param buffer Memory pointer to encoded certificate or key. + * The memory is not referenced after this function returns. + * @param size Size of memory at \p buffer. + * @param errstr Memory were a human-readable error string will be written + * on failure. + * @param errstr_size Size of \p errstr, including space for nul-terminator. + * + * @returns RD_KAFKA_CONF_OK on success or RD_KAFKA_CONF_INVALID if the + * memory in \p buffer is of incorrect encoding, or if librdkafka + * was not built with SSL support. + * + * @remark Calling this method multiple times with the same \p cert_type + * will replace the previous value. + * + * @remark Calling this method with \p buffer set to NULL will clear the + * configuration for \p cert_type. + * + * @remark The private key may require a password, which must be specified + * with the `ssl.key.password` configuration property prior to + * calling this function. + * + * @remark Private and public keys in PEM format may also be set with the + * `ssl.key.pem` and `ssl.certificate.pem` configuration properties. + * + * @remark CA certificate in PEM format may also be set with the + * `ssl.ca.pem` configuration property. + * + * @remark When librdkafka is linked to OpenSSL 3.0 and the certificate is + * encoded using an obsolete cipher, it might be necessary to set up + * an OpenSSL configuration file to load the "legacy" provider and + * set the OPENSSL_CONF environment variable. + * See + * https://github.com/openssl/openssl/blob/master/README-PROVIDERS.md for more + * information. + */ +RD_EXPORT rd_kafka_conf_res_t +rd_kafka_conf_set_ssl_cert(rd_kafka_conf_t *conf, + rd_kafka_cert_type_t cert_type, + rd_kafka_cert_enc_t cert_enc, + const void *buffer, + size_t size, + char *errstr, + size_t errstr_size); + + +/** + * @brief Set callback_data for OpenSSL engine. + * + * @param conf Configuration object. + * @param callback_data passed to engine callbacks, + * e.g. \c ENGINE_load_ssl_client_cert. + * + * @remark The \c ssl.engine.location configuration must be set for this + * to have affect. + * + * @remark The memory pointed to by \p value must remain valid for the + * lifetime of the configuration object and any Kafka clients that + * use it. + */ +RD_EXPORT +void rd_kafka_conf_set_engine_callback_data(rd_kafka_conf_t *conf, + void *callback_data); + + +/** + * @brief Sets the application's opaque pointer that will be passed to callbacks + * + * @sa rd_kafka_opaque() + */ +RD_EXPORT +void rd_kafka_conf_set_opaque(rd_kafka_conf_t *conf, void *opaque); + +/** + * @brief Retrieves the opaque pointer previously set + * with rd_kafka_conf_set_opaque() + */ +RD_EXPORT +void *rd_kafka_opaque(const rd_kafka_t *rk); + + + +/** + * @brief Sets the default topic configuration to use for automatically + * subscribed topics (e.g., through pattern-matched topics). + * The topic config object is not usable after this call. + * + * @warning Any topic configuration settings that have been set on the + * global rd_kafka_conf_t object will be overwritten by this call + * since the implicitly created default topic config object is + * replaced by the user-supplied one. + * + * @deprecated Set default topic level configuration on the + * global rd_kafka_conf_t object instead. + */ +RD_EXPORT +void rd_kafka_conf_set_default_topic_conf(rd_kafka_conf_t *conf, + rd_kafka_topic_conf_t *tconf); + +/** + * @brief Gets the default topic configuration as previously set with + * rd_kafka_conf_set_default_topic_conf() or that was implicitly created + * by configuring a topic-level property on the global \p conf object. + * + * @returns the \p conf's default topic configuration (if any), or NULL. + * + * @warning The returned topic configuration object is owned by the \p conf + * object. It may be modified but not destroyed and its lifetime is + * the same as the \p conf object or the next call to + * rd_kafka_conf_set_default_topic_conf(). + */ +RD_EXPORT rd_kafka_topic_conf_t * +rd_kafka_conf_get_default_topic_conf(rd_kafka_conf_t *conf); + + +/** + * @brief Retrieve configuration value for property \p name. + * + * If \p dest is non-NULL the value will be written to \p dest with at + * most \p dest_size. + * + * \p *dest_size is updated to the full length of the value, thus if + * \p *dest_size initially is smaller than the full length the application + * may reallocate \p dest to fit the returned \p *dest_size and try again. + * + * If \p dest is NULL only the full length of the value is returned. + * + * Fallthrough: + * Topic-level configuration properties from the \c default_topic_conf + * may be retrieved using this interface. + * + * @returns \p RD_KAFKA_CONF_OK if the property name matched, else + * \p RD_KAFKA_CONF_UNKNOWN. + */ +RD_EXPORT +rd_kafka_conf_res_t rd_kafka_conf_get(const rd_kafka_conf_t *conf, + const char *name, + char *dest, + size_t *dest_size); + + +/** + * @brief Retrieve topic configuration value for property \p name. + * + * @sa rd_kafka_conf_get() + */ +RD_EXPORT +rd_kafka_conf_res_t rd_kafka_topic_conf_get(const rd_kafka_topic_conf_t *conf, + const char *name, + char *dest, + size_t *dest_size); + + +/** + * @brief Dump the configuration properties and values of \p conf to an array + * with \"key\", \"value\" pairs. + * + * The number of entries in the array is returned in \p *cntp. + * + * The dump must be freed with `rd_kafka_conf_dump_free()`. + */ +RD_EXPORT +const char **rd_kafka_conf_dump(rd_kafka_conf_t *conf, size_t *cntp); + + +/** + * @brief Dump the topic configuration properties and values of \p conf + * to an array with \"key\", \"value\" pairs. + * + * The number of entries in the array is returned in \p *cntp. + * + * The dump must be freed with `rd_kafka_conf_dump_free()`. + */ +RD_EXPORT +const char **rd_kafka_topic_conf_dump(rd_kafka_topic_conf_t *conf, + size_t *cntp); + +/** + * @brief Frees a configuration dump returned from `rd_kafka_conf_dump()` or + * `rd_kafka_topic_conf_dump(). + */ +RD_EXPORT +void rd_kafka_conf_dump_free(const char **arr, size_t cnt); + +/** + * @brief Prints a table to \p fp of all supported configuration properties, + * their default values as well as a description. + * + * @remark All properties and properties and values are shown, even those + * that have been disabled at build time due to missing dependencies. + */ +RD_EXPORT +void rd_kafka_conf_properties_show(FILE *fp); + +/**@}*/ + + +/** + * @name Topic configuration + * @brief Topic configuration property interface + * @{ + * + */ + + +/** + * @brief Create topic configuration object + * + * @sa Same semantics as for rd_kafka_conf_new(). + */ +RD_EXPORT +rd_kafka_topic_conf_t *rd_kafka_topic_conf_new(void); + + +/** + * @brief Creates a copy/duplicate of topic configuration object \p conf. + */ +RD_EXPORT +rd_kafka_topic_conf_t * +rd_kafka_topic_conf_dup(const rd_kafka_topic_conf_t *conf); + +/** + * @brief Creates a copy/duplicate of \p rk 's default topic configuration + * object. + */ +RD_EXPORT +rd_kafka_topic_conf_t *rd_kafka_default_topic_conf_dup(rd_kafka_t *rk); + + +/** + * @brief Destroys a topic conf object. + */ +RD_EXPORT +void rd_kafka_topic_conf_destroy(rd_kafka_topic_conf_t *topic_conf); + + +/** + * @brief Sets a single rd_kafka_topic_conf_t value by property name. + * + * \p topic_conf should have been previously set up + * with `rd_kafka_topic_conf_new()`. + * + * @returns rd_kafka_conf_res_t to indicate success or failure. + */ +RD_EXPORT +rd_kafka_conf_res_t rd_kafka_topic_conf_set(rd_kafka_topic_conf_t *conf, + const char *name, + const char *value, + char *errstr, + size_t errstr_size); + +/** + * @brief Sets the application's opaque pointer that will be passed to all topic + * callbacks as the \c rkt_opaque argument. + * + * @sa rd_kafka_topic_opaque() + */ +RD_EXPORT +void rd_kafka_topic_conf_set_opaque(rd_kafka_topic_conf_t *conf, + void *rkt_opaque); + + +/** + * @brief \b Producer: Set partitioner callback in provided topic conf object. + * + * The partitioner may be called in any thread at any time, + * it may be called multiple times for the same message/key. + * + * The callback's \p rkt_opaque argument is the opaque set by + * rd_kafka_topic_conf_set_opaque(). + * The callback's \p msg_opaque argument is the per-message opaque + * passed to produce(). + * + * Partitioner function constraints: + * - MUST NOT call any rd_kafka_*() functions except: + * rd_kafka_topic_partition_available() + * - MUST NOT block or execute for prolonged periods of time. + * - MUST return a value between 0 and partition_cnt-1, or the + * special \c RD_KAFKA_PARTITION_UA value if partitioning + * could not be performed. + */ +RD_EXPORT +void rd_kafka_topic_conf_set_partitioner_cb( + rd_kafka_topic_conf_t *topic_conf, + int32_t (*partitioner)(const rd_kafka_topic_t *rkt, + const void *keydata, + size_t keylen, + int32_t partition_cnt, + void *rkt_opaque, + void *msg_opaque)); + + +/** + * @brief \b Producer: Set message queueing order comparator callback. + * + * The callback may be called in any thread at any time, + * it may be called multiple times for the same message. + * + * Ordering comparator function constraints: + * - MUST be stable sort (same input gives same output). + * - MUST NOT call any rd_kafka_*() functions. + * - MUST NOT block or execute for prolonged periods of time. + * + * The comparator shall compare the two messages and return: + * - < 0 if message \p a should be inserted before message \p b. + * - >=0 if message \p a should be inserted after message \p b. + * + * @remark Insert sorting will be used to enqueue the message in the + * correct queue position, this comes at a cost of O(n). + * + * @remark If `queuing.strategy=fifo` new messages are enqueued to the + * tail of the queue regardless of msg_order_cmp, but retried messages + * are still affected by msg_order_cmp. + * + * @warning THIS IS AN EXPERIMENTAL API, SUBJECT TO CHANGE OR REMOVAL, + * DO NOT USE IN PRODUCTION. + */ +RD_EXPORT void rd_kafka_topic_conf_set_msg_order_cmp( + rd_kafka_topic_conf_t *topic_conf, + int (*msg_order_cmp)(const rd_kafka_message_t *a, + const rd_kafka_message_t *b)); + + +/** + * @brief Check if partition is available (has a leader broker). + * + * @returns 1 if the partition is available, else 0. + * + * @warning This function must only be called from inside a partitioner function + */ +RD_EXPORT +int rd_kafka_topic_partition_available(const rd_kafka_topic_t *rkt, + int32_t partition); + + +/******************************************************************* + * * + * Partitioners provided by rdkafka * + * * + *******************************************************************/ + +/** + * @brief Random partitioner. + * + * Will try not to return unavailable partitions. + * + * The \p rkt_opaque argument is the opaque set by + * rd_kafka_topic_conf_set_opaque(). + * The \p msg_opaque argument is the per-message opaque + * passed to produce(). + * + * @returns a random partition between 0 and \p partition_cnt - 1. + * + */ +RD_EXPORT +int32_t rd_kafka_msg_partitioner_random(const rd_kafka_topic_t *rkt, + const void *key, + size_t keylen, + int32_t partition_cnt, + void *rkt_opaque, + void *msg_opaque); + +/** + * @brief Consistent partitioner. + * + * Uses consistent hashing to map identical keys onto identical partitions. + * + * The \p rkt_opaque argument is the opaque set by + * rd_kafka_topic_conf_set_opaque(). + * The \p msg_opaque argument is the per-message opaque + * passed to produce(). + * + * @returns a \"random\" partition between 0 and \p partition_cnt - 1 based on + * the CRC value of the key + */ +RD_EXPORT +int32_t rd_kafka_msg_partitioner_consistent(const rd_kafka_topic_t *rkt, + const void *key, + size_t keylen, + int32_t partition_cnt, + void *rkt_opaque, + void *msg_opaque); + +/** + * @brief Consistent-Random partitioner. + * + * This is the default partitioner. + * Uses consistent hashing to map identical keys onto identical partitions, and + * messages without keys will be assigned via the random partitioner. + * + * The \p rkt_opaque argument is the opaque set by + * rd_kafka_topic_conf_set_opaque(). + * The \p msg_opaque argument is the per-message opaque + * passed to produce(). + * + * @returns a \"random\" partition between 0 and \p partition_cnt - 1 based on + * the CRC value of the key (if provided) + */ +RD_EXPORT +int32_t rd_kafka_msg_partitioner_consistent_random(const rd_kafka_topic_t *rkt, + const void *key, + size_t keylen, + int32_t partition_cnt, + void *rkt_opaque, + void *msg_opaque); + + +/** + * @brief Murmur2 partitioner (Java compatible). + * + * Uses consistent hashing to map identical keys onto identical partitions + * using Java-compatible Murmur2 hashing. + * + * The \p rkt_opaque argument is the opaque set by + * rd_kafka_topic_conf_set_opaque(). + * The \p msg_opaque argument is the per-message opaque + * passed to produce(). + * + * @returns a partition between 0 and \p partition_cnt - 1. + */ +RD_EXPORT +int32_t rd_kafka_msg_partitioner_murmur2(const rd_kafka_topic_t *rkt, + const void *key, + size_t keylen, + int32_t partition_cnt, + void *rkt_opaque, + void *msg_opaque); + +/** + * @brief Consistent-Random Murmur2 partitioner (Java compatible). + * + * Uses consistent hashing to map identical keys onto identical partitions + * using Java-compatible Murmur2 hashing. + * Messages without keys will be assigned via the random partitioner. + * + * The \p rkt_opaque argument is the opaque set by + * rd_kafka_topic_conf_set_opaque(). + * The \p msg_opaque argument is the per-message opaque + * passed to produce(). + * + * @returns a partition between 0 and \p partition_cnt - 1. + */ +RD_EXPORT +int32_t rd_kafka_msg_partitioner_murmur2_random(const rd_kafka_topic_t *rkt, + const void *key, + size_t keylen, + int32_t partition_cnt, + void *rkt_opaque, + void *msg_opaque); + + +/** + * @brief FNV-1a partitioner. + * + * Uses consistent hashing to map identical keys onto identical partitions + * using FNV-1a hashing. + * + * The \p rkt_opaque argument is the opaque set by + * rd_kafka_topic_conf_set_opaque(). + * The \p msg_opaque argument is the per-message opaque + * passed to produce(). + * + * @returns a partition between 0 and \p partition_cnt - 1. + */ +RD_EXPORT +int32_t rd_kafka_msg_partitioner_fnv1a(const rd_kafka_topic_t *rkt, + const void *key, + size_t keylen, + int32_t partition_cnt, + void *rkt_opaque, + void *msg_opaque); + + +/** + * @brief Consistent-Random FNV-1a partitioner. + * + * Uses consistent hashing to map identical keys onto identical partitions + * using FNV-1a hashing. + * Messages without keys will be assigned via the random partitioner. + * + * The \p rkt_opaque argument is the opaque set by + * rd_kafka_topic_conf_set_opaque(). + * The \p msg_opaque argument is the per-message opaque + * passed to produce(). + * + * @returns a partition between 0 and \p partition_cnt - 1. + */ +RD_EXPORT +int32_t rd_kafka_msg_partitioner_fnv1a_random(const rd_kafka_topic_t *rkt, + const void *key, + size_t keylen, + int32_t partition_cnt, + void *rkt_opaque, + void *msg_opaque); + + +/**@}*/ + + + +/** + * @name Main Kafka and Topic object handles + * @{ + * + * + */ + + + +/** + * @brief Creates a new Kafka handle and starts its operation according to the + * specified \p type (\p RD_KAFKA_CONSUMER or \p RD_KAFKA_PRODUCER). + * + * \p conf is an optional struct created with `rd_kafka_conf_new()` that will + * be used instead of the default configuration. + * The \p conf object is freed by this function on success and must not be used + * or destroyed by the application subsequently. + * See `rd_kafka_conf_set()` et.al for more information. + * + * \p errstr must be a pointer to memory of at least size \p errstr_size where + * `rd_kafka_new()` may write a human readable error message in case the + * creation of a new handle fails. In which case the function returns NULL. + * + * @remark \b RD_KAFKA_CONSUMER: When a new \p RD_KAFKA_CONSUMER + * rd_kafka_t handle is created it may either operate in the + * legacy simple consumer mode using the rd_kafka_consume_start() + * interface, or the High-level KafkaConsumer API. + * @remark An application must only use one of these groups of APIs on a given + * rd_kafka_t RD_KAFKA_CONSUMER handle. + + * + * @returns The Kafka handle on success or NULL on error (see \p errstr) + * + * @sa To destroy the Kafka handle, use rd_kafka_destroy(). + */ +RD_EXPORT +rd_kafka_t *rd_kafka_new(rd_kafka_type_t type, + rd_kafka_conf_t *conf, + char *errstr, + size_t errstr_size); + + +/** + * @brief Destroy Kafka handle. + * + * @remark This is a blocking operation. + * @remark rd_kafka_consumer_close() will be called from this function + * if the instance type is RD_KAFKA_CONSUMER, a \c group.id was + * configured, and the rd_kafka_consumer_close() was not + * explicitly called by the application. This in turn may + * trigger consumer callbacks, such as rebalance_cb. + * Use rd_kafka_destroy_flags() with + * RD_KAFKA_DESTROY_F_NO_CONSUMER_CLOSE to avoid this behaviour. + * + * @sa rd_kafka_destroy_flags() + */ +RD_EXPORT +void rd_kafka_destroy(rd_kafka_t *rk); + + +/** + * @brief Destroy Kafka handle according to specified destroy flags + * + */ +RD_EXPORT +void rd_kafka_destroy_flags(rd_kafka_t *rk, int flags); + +/** + * @brief Flags for rd_kafka_destroy_flags() + */ + +/*! + * Don't call consumer_close() to leave group and commit final offsets. + * + * This also disables consumer callbacks to be called from rd_kafka_destroy*(), + * such as rebalance_cb. + * + * The consumer group handler is still closed internally, but from an + * application perspective none of the functionality from consumer_close() + * is performed. + */ +#define RD_KAFKA_DESTROY_F_NO_CONSUMER_CLOSE 0x8 + + + +/** + * @brief Returns Kafka handle name. + */ +RD_EXPORT +const char *rd_kafka_name(const rd_kafka_t *rk); + + +/** + * @brief Returns Kafka handle type. + */ +RD_EXPORT +rd_kafka_type_t rd_kafka_type(const rd_kafka_t *rk); + + +/** + * @brief Returns this client's broker-assigned group member id. + * + * @remark This currently requires the high-level KafkaConsumer + * + * @returns An allocated string containing the current broker-assigned group + * member id, or NULL if not available. + * The application must free the string with \p free() or + * rd_kafka_mem_free() + */ +RD_EXPORT +char *rd_kafka_memberid(const rd_kafka_t *rk); + + + +/** + * @brief Returns the ClusterId as reported in broker metadata. + * + * @param rk Client instance. + * @param timeout_ms If there is no cached value from metadata retrieval + * then this specifies the maximum amount of time + * (in milliseconds) the call will block waiting + * for metadata to be retrieved. + * Use 0 for non-blocking calls. + + * @remark Requires broker version >=0.10.0 and api.version.request=true. + * + * @remark The application must free the returned pointer + * using rd_kafka_mem_free(). + * + * @returns a newly allocated string containing the ClusterId, or NULL + * if no ClusterId could be retrieved in the allotted timespan. + */ +RD_EXPORT +char *rd_kafka_clusterid(rd_kafka_t *rk, int timeout_ms); + + +/** + * @brief Returns the current ControllerId as reported in broker metadata. + * + * @param rk Client instance. + * @param timeout_ms If there is no cached value from metadata retrieval + * then this specifies the maximum amount of time + * (in milliseconds) the call will block waiting + * for metadata to be retrieved. + * Use 0 for non-blocking calls. + + * @remark Requires broker version >=0.10.0 and api.version.request=true. + * + * @returns the controller broker id (>= 0), or -1 if no ControllerId could be + * retrieved in the allotted timespan. + */ +RD_EXPORT +int32_t rd_kafka_controllerid(rd_kafka_t *rk, int timeout_ms); + + +/** + * @brief Creates a new topic handle for topic named \p topic. + * + * \p conf is an optional configuration for the topic created with + * `rd_kafka_topic_conf_new()` that will be used instead of the default + * topic configuration. + * The \p conf object is freed by this function and must not be used or + * destroyed by the application subsequently. + * See `rd_kafka_topic_conf_set()` et.al for more information. + * + * Topic handles are refcounted internally and calling rd_kafka_topic_new() + * again with the same topic name will return the previous topic handle + * without updating the original handle's configuration. + * Applications must eventually call rd_kafka_topic_destroy() for each + * succesfull call to rd_kafka_topic_new() to clear up resources. + * + * @returns the new topic handle or NULL on error (use rd_kafka_errno2err() + * to convert system \p errno to an rd_kafka_resp_err_t error code. + * + * @sa rd_kafka_topic_destroy() + */ +RD_EXPORT +rd_kafka_topic_t *rd_kafka_topic_new(rd_kafka_t *rk, + const char *topic, + rd_kafka_topic_conf_t *conf); + + + +/** + * @brief Loose application's topic handle refcount as previously created + * with `rd_kafka_topic_new()`. + * + * @remark Since topic objects are refcounted (both internally and for the app) + * the topic object might not actually be destroyed by this call, + * but the application must consider the object destroyed. + */ +RD_EXPORT +void rd_kafka_topic_destroy(rd_kafka_topic_t *rkt); + + +/** + * @brief Returns the topic name. + */ +RD_EXPORT +const char *rd_kafka_topic_name(const rd_kafka_topic_t *rkt); + + +/** + * @brief Get the \p rkt_opaque pointer that was set in the topic configuration + * with rd_kafka_topic_conf_set_opaque(). + */ +RD_EXPORT +void *rd_kafka_topic_opaque(const rd_kafka_topic_t *rkt); + + +/** + * @brief Unassigned partition. + * + * The unassigned partition is used by the producer API for messages + * that should be partitioned using the configured or default partitioner. + */ +#define RD_KAFKA_PARTITION_UA ((int32_t)-1) + + +/** + * @brief Polls the provided kafka handle for events. + * + * Events will cause application-provided callbacks to be called. + * + * The \p timeout_ms argument specifies the maximum amount of time + * (in milliseconds) that the call will block waiting for events. + * For non-blocking calls, provide 0 as \p timeout_ms. + * To wait indefinitely for an event, provide -1. + * + * @remark An application should make sure to call poll() at regular + * intervals to serve any queued callbacks waiting to be called. + * @remark If your producer doesn't have any callback set (in particular + * via rd_kafka_conf_set_dr_msg_cb or rd_kafka_conf_set_error_cb) + * you might choose not to call poll(), though this is not + * recommended. + * + * Events: + * - delivery report callbacks (if dr_cb/dr_msg_cb is configured) [producer] + * - error callbacks (rd_kafka_conf_set_error_cb()) [all] + * - stats callbacks (rd_kafka_conf_set_stats_cb()) [all] + * - throttle callbacks (rd_kafka_conf_set_throttle_cb()) [all] + * - OAUTHBEARER token refresh callbacks + * (rd_kafka_conf_set_oauthbearer_token_refresh_cb()) [all] + * + * @returns the number of events served. + */ +RD_EXPORT +int rd_kafka_poll(rd_kafka_t *rk, int timeout_ms); + + +/** + * @brief Cancels the current callback dispatcher (rd_kafka_poll(), + * rd_kafka_consume_callback(), etc). + * + * A callback may use this to force an immediate return to the calling + * code (caller of e.g. rd_kafka_poll()) without processing any further + * events. + * + * @remark This function MUST ONLY be called from within a librdkafka callback. + */ +RD_EXPORT +void rd_kafka_yield(rd_kafka_t *rk); + + + +/** + * @brief Pause producing or consumption for the provided list of partitions. + * + * Success or error is returned per-partition \p err in the \p partitions list. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_pause_partitions(rd_kafka_t *rk, + rd_kafka_topic_partition_list_t *partitions); + + + +/** + * @brief Resume producing consumption for the provided list of partitions. + * + * Success or error is returned per-partition \p err in the \p partitions list. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_resume_partitions(rd_kafka_t *rk, + rd_kafka_topic_partition_list_t *partitions); + + + +/** + * @brief Query broker for low (oldest/beginning) and high (newest/end) offsets + * for partition. + * + * Offsets are returned in \p *low and \p *high respectively. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or an error code on failure. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_query_watermark_offsets(rd_kafka_t *rk, + const char *topic, + int32_t partition, + int64_t *low, + int64_t *high, + int timeout_ms); + + +/** + * @brief Get last known low (oldest/beginning) and high (newest/end) offsets + * for partition. + * + * The low offset is updated periodically (if statistics.interval.ms is set) + * while the high offset is updated on each fetched message set from the broker. + * + * If there is no cached offset (either low or high, or both) then + * RD_KAFKA_OFFSET_INVALID will be returned for the respective offset. + * + * Offsets are returned in \p *low and \p *high respectively. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or an error code on failure. + * + * @remark Shall only be used with an active consumer instance. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_get_watermark_offsets(rd_kafka_t *rk, + const char *topic, + int32_t partition, + int64_t *low, + int64_t *high); + + + +/** + * @brief Look up the offsets for the given partitions by timestamp. + * + * The returned offset for each partition is the earliest offset whose + * timestamp is greater than or equal to the given timestamp in the + * corresponding partition. + * + * The timestamps to query are represented as \c offset in \p offsets + * on input, and \c offset will contain the offset on output. + * + * The function will block for at most \p timeout_ms milliseconds. + * + * @remark Duplicate Topic+Partitions are not supported. + * @remark Per-partition errors may be returned in \c + * rd_kafka_topic_partition_t.err + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR if offsets were be queried (do note + * that per-partition errors might be set), + * RD_KAFKA_RESP_ERR__TIMED_OUT if not all offsets could be fetched + * within \p timeout_ms, + * RD_KAFKA_RESP_ERR__INVALID_ARG if the \p offsets list is empty, + * RD_KAFKA_RESP_ERR__UNKNOWN_PARTITION if all partitions are unknown, + * RD_KAFKA_RESP_ERR_LEADER_NOT_AVAILABLE if unable to query leaders + * for the given partitions. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_offsets_for_times(rd_kafka_t *rk, + rd_kafka_topic_partition_list_t *offsets, + int timeout_ms); + + + +/** + * @brief Allocate and zero memory using the same allocator librdkafka uses. + * + * This is typically an abstraction for the calloc(3) call and makes sure + * the application can use the same memory allocator as librdkafka for + * allocating pointers that are used by librdkafka. + * + * \p rk can be set to return memory allocated by a specific \c rk instance + * otherwise pass NULL for \p rk. + * + * @remark Memory allocated by rd_kafka_mem_calloc() must be freed using + * rd_kafka_mem_free() + */ +RD_EXPORT +void *rd_kafka_mem_calloc(rd_kafka_t *rk, size_t num, size_t size); + + + +/** + * @brief Allocate memory using the same allocator librdkafka uses. + * + * This is typically an abstraction for the malloc(3) call and makes sure + * the application can use the same memory allocator as librdkafka for + * allocating pointers that are used by librdkafka. + * + * \p rk can be set to return memory allocated by a specific \c rk instance + * otherwise pass NULL for \p rk. + * + * @remark Memory allocated by rd_kafka_mem_malloc() must be freed using + * rd_kafka_mem_free() + */ +RD_EXPORT +void *rd_kafka_mem_malloc(rd_kafka_t *rk, size_t size); + + + +/** + * @brief Free pointer returned by librdkafka + * + * This is typically an abstraction for the free(3) call and makes sure + * the application can use the same memory allocator as librdkafka for + * freeing pointers returned by librdkafka. + * + * In standard setups it is usually not necessary to use this interface + * rather than the free(3) functione. + * + * \p rk must be set for memory returned by APIs that take an \c rk argument, + * for other APIs pass NULL for \p rk. + * + * @remark rd_kafka_mem_free() must only be used for pointers returned by APIs + * that explicitly mention using this function for freeing. + */ +RD_EXPORT +void rd_kafka_mem_free(rd_kafka_t *rk, void *ptr); + + +/**@}*/ + + + +/** + * @name Queue API + * @{ + * + * Message queues allows the application to re-route consumed messages + * from multiple topic+partitions into one single queue point. + * This queue point containing messages from a number of topic+partitions + * may then be served by a single rd_kafka_consume*_queue() call, + * rather than one call per topic+partition combination. + */ + + +/** + * @brief Create a new message queue. + * + * See rd_kafka_consume_start_queue(), rd_kafka_consume_queue(), et.al. + */ +RD_EXPORT +rd_kafka_queue_t *rd_kafka_queue_new(rd_kafka_t *rk); + +/** + * Destroy a queue, purging all of its enqueued messages. + */ +RD_EXPORT +void rd_kafka_queue_destroy(rd_kafka_queue_t *rkqu); + + +/** + * @returns a reference to the main librdkafka event queue. + * This is the queue served by rd_kafka_poll(). + * + * Use rd_kafka_queue_destroy() to loose the reference. + */ +RD_EXPORT +rd_kafka_queue_t *rd_kafka_queue_get_main(rd_kafka_t *rk); + + + +/** + * @returns a reference to the SASL callback queue, if a SASL mechanism + * with callbacks is configured (currently only OAUTHBEARER), else + * returns NULL. + * + * Use rd_kafka_queue_destroy() to loose the reference. + * + * @sa rd_kafka_sasl_background_callbacks_enable() + */ +RD_EXPORT +rd_kafka_queue_t *rd_kafka_queue_get_sasl(rd_kafka_t *rk); + + +/** + * @brief Enable SASL OAUTHBEARER refresh callbacks on the librdkafka + * background thread. + * + * This serves as an alternative for applications that do not call + * rd_kafka_poll() (et.al.) at regular intervals (or not at all), as a means + * of automatically trigger the refresh callbacks, which are needed to + * initiate connections to the brokers in the case a custom OAUTHBEARER + * refresh callback is configured. + * + * @returns NULL on success or an error object on error. + * + * @sa rd_kafka_queue_get_sasl() + * @sa rd_kafka_conf_set_oauthbearer_token_refresh_cb() + */ +RD_EXPORT +rd_kafka_error_t *rd_kafka_sasl_background_callbacks_enable(rd_kafka_t *rk); + + +/** + * @brief Sets SASL credentials used for SASL PLAIN and SCRAM mechanisms by + * this Kafka client. + * + * This function sets or resets the SASL username and password credentials + * used by this Kafka client. The new credentials will be used the next time + * this client needs to authenticate to a broker. This function + * will not disconnect existing connections that might have been made using + * the old credentials. + * + * @remark This function only applies to the SASL PLAIN and SCRAM mechanisms. + * + * @returns NULL on success or an error object on error. + */ +RD_EXPORT +rd_kafka_error_t *rd_kafka_sasl_set_credentials(rd_kafka_t *rk, + const char *username, + const char *password); + +/** + * @returns a reference to the librdkafka consumer queue. + * This is the queue served by rd_kafka_consumer_poll(). + * + * Use rd_kafka_queue_destroy() to loose the reference. + * + * @remark rd_kafka_queue_destroy() MUST be called on this queue + * prior to calling rd_kafka_consumer_close(). + */ +RD_EXPORT +rd_kafka_queue_t *rd_kafka_queue_get_consumer(rd_kafka_t *rk); + +/** + * @returns a reference to the partition's queue, or NULL if + * partition is invalid. + * + * Use rd_kafka_queue_destroy() to loose the reference. + * + * @remark rd_kafka_queue_destroy() MUST be called on this queue + * + * @remark This function only works on consumers. + */ +RD_EXPORT +rd_kafka_queue_t *rd_kafka_queue_get_partition(rd_kafka_t *rk, + const char *topic, + int32_t partition); + +/** + * @returns a reference to the background thread queue, or NULL if the + * background queue is not enabled. + * + * The background thread queue provides the application with an automatically + * polled queue that triggers the event callback in a background thread, + * this background thread is completely managed by librdkafka. + * + * The background thread queue is automatically created if a generic event + * handler callback is configured with rd_kafka_conf_set_background_event_cb() + * or if rd_kafka_queue_get_background() is called. + * + * The background queue is polled and served by librdkafka and MUST NOT be + * polled, forwarded, or otherwise managed by the application, it may only + * be used as the destination queue passed to queue-enabled APIs, such as + * the Admin API. + * + * Use rd_kafka_queue_destroy() to loose the reference. + * + * @warning The background queue MUST NOT be read from (polled, consumed, etc), + * or forwarded from. + */ +RD_EXPORT +rd_kafka_queue_t *rd_kafka_queue_get_background(rd_kafka_t *rk); + + +/** + * @brief Forward/re-route queue \p src to \p dst. + * If \p dst is \c NULL the forwarding is removed. + * + * The internal refcounts for both queues are increased. + * + * @remark Regardless of whether \p dst is NULL or not, after calling this + * function, \p src will not forward it's fetch queue to the consumer + * queue. + */ +RD_EXPORT +void rd_kafka_queue_forward(rd_kafka_queue_t *src, rd_kafka_queue_t *dst); + +/** + * @brief Forward librdkafka logs (and debug) to the specified queue + * for serving with one of the ..poll() calls. + * + * This allows an application to serve log callbacks (\c log_cb) + * in its thread of choice. + * + * @param rk Client instance. + * @param rkqu Queue to forward logs to. If the value is NULL the logs + * are forwarded to the main queue. + * + * @remark The configuration property \c log.queue MUST also be set to true. + * + * @remark librdkafka maintains its own reference to the provided queue. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or an error code on error, + * eg RD_KAFKA_RESP_ERR__NOT_CONFIGURED when log.queue is not set to true. + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_set_log_queue(rd_kafka_t *rk, + rd_kafka_queue_t *rkqu); + + +/** + * @returns the current number of elements in queue. + */ +RD_EXPORT +size_t rd_kafka_queue_length(rd_kafka_queue_t *rkqu); + + +/** + * @brief Enable IO event triggering for queue. + * + * To ease integration with IO based polling loops this API + * allows an application to create a separate file-descriptor + * that librdkafka will write \p payload (of size \p size) to + * whenever a new element is enqueued on a previously empty queue. + * + * To remove event triggering call with \p fd = -1. + * + * librdkafka will maintain a copy of the \p payload. + * + * @remark IO and callback event triggering are mutually exclusive. + * @remark When using forwarded queues the IO event must only be enabled + * on the final forwarded-to (destination) queue. + * @remark The file-descriptor/socket must be set to non-blocking. + */ +RD_EXPORT +void rd_kafka_queue_io_event_enable(rd_kafka_queue_t *rkqu, + int fd, + const void *payload, + size_t size); + +/** + * @brief Enable callback event triggering for queue. + * + * The callback will be called from an internal librdkafka thread + * when a new element is enqueued on a previously empty queue. + * + * To remove event triggering call with \p event_cb = NULL. + * + * The \p qev_opaque is passed to the callback's \p qev_opaque argument. + * + * @remark IO and callback event triggering are mutually exclusive. + * @remark Since the callback may be triggered from internal librdkafka + * threads, the application must not perform any pro-longed work in + * the callback, or call any librdkafka APIs (for the same rd_kafka_t + * handle). + */ +RD_EXPORT +void rd_kafka_queue_cb_event_enable(rd_kafka_queue_t *rkqu, + void (*event_cb)(rd_kafka_t *rk, + void *qev_opaque), + void *qev_opaque); + + +/** + * @brief Cancels the current rd_kafka_queue_poll() on \p rkqu. + * + * An application may use this from another thread to force + * an immediate return to the calling code (caller of rd_kafka_queue_poll()). + * Must not be used from signal handlers since that may cause deadlocks. + */ +RD_EXPORT +void rd_kafka_queue_yield(rd_kafka_queue_t *rkqu); + + +/**@}*/ + +/** + * + * @name Simple Consumer API (legacy) + * @{ + * + */ + + +#define RD_KAFKA_OFFSET_BEGINNING \ + -2 /**< Start consuming from beginning of \ + * kafka partition queue: oldest msg */ +#define RD_KAFKA_OFFSET_END \ + -1 /**< Start consuming from end of kafka \ + * partition queue: next msg */ +#define RD_KAFKA_OFFSET_STORED \ + -1000 /**< Start consuming from offset retrieved \ + * from offset store */ +#define RD_KAFKA_OFFSET_INVALID -1001 /**< Invalid offset */ + + +/** @cond NO_DOC */ +#define RD_KAFKA_OFFSET_TAIL_BASE -2000 /* internal: do not use */ +/** @endcond */ + +/** + * @brief Start consuming \p CNT messages from topic's current end offset. + * + * That is, if current end offset is 12345 and \p CNT is 200, it will start + * consuming from offset \c 12345-200 = \c 12145. */ +#define RD_KAFKA_OFFSET_TAIL(CNT) (RD_KAFKA_OFFSET_TAIL_BASE - (CNT)) + +/** + * @brief Start consuming messages for topic \p rkt and \p partition + * at offset \p offset which may either be an absolute \c (0..N) + * or one of the logical offsets: + * - RD_KAFKA_OFFSET_BEGINNING + * - RD_KAFKA_OFFSET_END + * - RD_KAFKA_OFFSET_STORED + * - RD_KAFKA_OFFSET_TAIL + * + * rdkafka will attempt to keep \c queued.min.messages (config property) + * messages in the local queue by repeatedly fetching batches of messages + * from the broker until the threshold is reached. + * + * The application shall use one of the `rd_kafka_consume*()` functions + * to consume messages from the local queue, each kafka message being + * represented as a `rd_kafka_message_t *` object. + * + * `rd_kafka_consume_start()` must not be called multiple times for the same + * topic and partition without stopping consumption first with + * `rd_kafka_consume_stop()`. + * + * @returns 0 on success or -1 on error in which case errno is set accordingly: + * - EBUSY - Conflicts with an existing or previous subscription + * (RD_KAFKA_RESP_ERR__CONFLICT) + * - EINVAL - Invalid offset, or incomplete configuration (lacking group.id) + * (RD_KAFKA_RESP_ERR__INVALID_ARG) + * - ESRCH - requested \p partition is invalid. + * (RD_KAFKA_RESP_ERR__UNKNOWN_PARTITION) + * - ENOENT - topic is unknown in the Kafka cluster. + * (RD_KAFKA_RESP_ERR__UNKNOWN_TOPIC) + * + * Use `rd_kafka_errno2err()` to convert sytem \c errno to `rd_kafka_resp_err_t` + */ +RD_EXPORT +int rd_kafka_consume_start(rd_kafka_topic_t *rkt, + int32_t partition, + int64_t offset); + +/** + * @brief Same as rd_kafka_consume_start() but re-routes incoming messages to + * the provided queue \p rkqu (which must have been previously allocated + * with `rd_kafka_queue_new()`. + * + * The application must use one of the `rd_kafka_consume_*_queue()` functions + * to receive fetched messages. + * + * `rd_kafka_consume_start_queue()` must not be called multiple times for the + * same topic and partition without stopping consumption first with + * `rd_kafka_consume_stop()`. + * `rd_kafka_consume_start()` and `rd_kafka_consume_start_queue()` must not + * be combined for the same topic and partition. + */ +RD_EXPORT +int rd_kafka_consume_start_queue(rd_kafka_topic_t *rkt, + int32_t partition, + int64_t offset, + rd_kafka_queue_t *rkqu); + +/** + * @brief Stop consuming messages for topic \p rkt and \p partition, purging + * all messages currently in the local queue. + * + * NOTE: To enforce synchronisation this call will block until the internal + * fetcher has terminated and offsets are committed to configured + * storage method. + * + * The application needs to be stop all consumers before calling + * `rd_kafka_destroy()` on the main object handle. + * + * @returns 0 on success or -1 on error (see `errno`). + */ +RD_EXPORT +int rd_kafka_consume_stop(rd_kafka_topic_t *rkt, int32_t partition); + + + +/** + * @brief Seek consumer for topic+partition to \p offset which is either an + * absolute or logical offset. + * + * If \p timeout_ms is specified (not 0) the seek call will wait this long + * for the consumer to update its fetcher state for the given partition with + * the new offset. This guarantees that no previously fetched messages for the + * old offset (or fetch position) will be passed to the application. + * + * If the timeout is reached the internal state will be unknown to the caller + * and this function returns `RD_KAFKA_RESP_ERR__TIMED_OUT`. + * + * If \p timeout_ms is 0 it will initiate the seek but return + * immediately without any error reporting (e.g., async). + * + * This call will purge all pre-fetched messages for the given partition, which + * may be up to \c queued.max.message.kbytes in size. Repeated use of seek + * may thus lead to increased network usage as messages are re-fetched from + * the broker. + * + * @remark Seek must only be performed for already assigned/consumed partitions, + * use rd_kafka_assign() (et.al) to set the initial starting offset + * for a new assignmenmt. + * + * @returns `RD_KAFKA_RESP_ERR__NO_ERROR` on success else an error code. + * + * @deprecated Use rd_kafka_seek_partitions(). + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_seek(rd_kafka_topic_t *rkt, + int32_t partition, + int64_t offset, + int timeout_ms); + + + +/** + * @brief Seek consumer for partitions in \p partitions to the per-partition + * offset in the \c .offset field of \p partitions. + * + * The offset may be either absolute (>= 0) or a logical offset. + * + * If \p timeout_ms is specified (not 0) the seek call will wait this long + * for the consumer to update its fetcher state for the given partition with + * the new offset. This guarantees that no previously fetched messages for the + * old offset (or fetch position) will be passed to the application. + * + * If the timeout is reached the internal state will be unknown to the caller + * and this function returns `RD_KAFKA_RESP_ERR__TIMED_OUT`. + * + * If \p timeout_ms is 0 it will initiate the seek but return + * immediately without any error reporting (e.g., async). + * + * This call will purge all pre-fetched messages for the given partition, which + * may be up to \c queued.max.message.kbytes in size. Repeated use of seek + * may thus lead to increased network usage as messages are re-fetched from + * the broker. + * + * Individual partition errors are reported in the per-partition \c .err field + * of \p partitions. + * + * @remark Seek must only be performed for already assigned/consumed partitions, + * use rd_kafka_assign() (et.al) to set the initial starting offset + * for a new assignmenmt. + * + * @returns NULL on success or an error object on failure. + */ +RD_EXPORT rd_kafka_error_t * +rd_kafka_seek_partitions(rd_kafka_t *rk, + rd_kafka_topic_partition_list_t *partitions, + int timeout_ms); + + +/** + * @brief Consume a single message from topic \p rkt and \p partition + * + * \p timeout_ms is maximum amount of time to wait for a message to be received. + * Consumer must have been previously started with `rd_kafka_consume_start()`. + * + * @returns a message object on success or \c NULL on error. + * The message object must be destroyed with `rd_kafka_message_destroy()` + * when the application is done with it. + * + * Errors (when returning NULL): + * - ETIMEDOUT - \p timeout_ms was reached with no new messages fetched. + * - ENOENT - \p rkt + \p partition is unknown. + * (no prior `rd_kafka_consume_start()` call) + * + * NOTE: The returned message's \c ..->err must be checked for errors. + * NOTE: \c ..->err \c == \c RD_KAFKA_RESP_ERR__PARTITION_EOF signals that the + * end of the partition has been reached, which should typically not be + * considered an error. The application should handle this case + * (e.g., ignore). + * + * @remark on_consume() interceptors may be called from this function prior to + * passing message to application. + */ +RD_EXPORT +rd_kafka_message_t * +rd_kafka_consume(rd_kafka_topic_t *rkt, int32_t partition, int timeout_ms); + + + +/** + * @brief Consume up to \p rkmessages_size from topic \p rkt and \p partition + * putting a pointer to each message in the application provided + * array \p rkmessages (of size \p rkmessages_size entries). + * + * `rd_kafka_consume_batch()` provides higher throughput performance + * than `rd_kafka_consume()`. + * + * \p timeout_ms is the maximum amount of time to wait for all of + * \p rkmessages_size messages to be put into \p rkmessages. + * If no messages were available within the timeout period this function + * returns 0 and \p rkmessages remains untouched. + * This differs somewhat from `rd_kafka_consume()`. + * + * The message objects must be destroyed with `rd_kafka_message_destroy()` + * when the application is done with it. + * + * @returns the number of rkmessages added in \p rkmessages, + * or -1 on error (same error codes as for `rd_kafka_consume()`. + * + * @sa rd_kafka_consume() + * + * @remark on_consume() interceptors may be called from this function prior to + * passing message to application. + */ +RD_EXPORT +ssize_t rd_kafka_consume_batch(rd_kafka_topic_t *rkt, + int32_t partition, + int timeout_ms, + rd_kafka_message_t **rkmessages, + size_t rkmessages_size); + + + +/** + * @brief Consumes messages from topic \p rkt and \p partition, calling + * the provided callback for each consumed messsage. + * + * `rd_kafka_consume_callback()` provides higher throughput performance + * than both `rd_kafka_consume()` and `rd_kafka_consume_batch()`. + * + * \p timeout_ms is the maximum amount of time to wait for one or more messages + * to arrive. + * + * The provided \p consume_cb function is called for each message, + * the application \b MUST \b NOT call `rd_kafka_message_destroy()` on the + * provided \p rkmessage. + * + * The \p commit_opaque argument is passed to the \p consume_cb + * as \p commit_opaque. + * + * @returns the number of messages processed or -1 on error. + * + * @sa rd_kafka_consume() + * + * @remark on_consume() interceptors may be called from this function prior to + * passing message to application. + * + * @remark This function will return early if a transaction control message is + * received, these messages are not exposed to the application but + * still enqueued on the consumer queue to make sure their + * offsets are stored. + * + * @deprecated This API is deprecated and subject for future removal. + * There is no new callback-based consume interface, use the + * poll/queue based alternatives. + */ +RD_EXPORT +int rd_kafka_consume_callback(rd_kafka_topic_t *rkt, + int32_t partition, + int timeout_ms, + void (*consume_cb)(rd_kafka_message_t *rkmessage, + void *commit_opaque), + void *commit_opaque); + + +/**@}*/ + +/** + * @name Simple Consumer API (legacy): Queue consumers + * @{ + * + * The following `..._queue()` functions are analogue to the functions above + * but reads messages from the provided queue \p rkqu instead. + * \p rkqu must have been previously created with `rd_kafka_queue_new()` + * and the topic consumer must have been started with + * `rd_kafka_consume_start_queue()` utilising the the same queue. + */ + +/** + * @brief Consume from queue + * + * @sa rd_kafka_consume() + */ +RD_EXPORT +rd_kafka_message_t *rd_kafka_consume_queue(rd_kafka_queue_t *rkqu, + int timeout_ms); + +/** + * @brief Consume batch of messages from queue + * + * @sa rd_kafka_consume_batch() + */ +RD_EXPORT +ssize_t rd_kafka_consume_batch_queue(rd_kafka_queue_t *rkqu, + int timeout_ms, + rd_kafka_message_t **rkmessages, + size_t rkmessages_size); + +/** + * @brief Consume multiple messages from queue with callback + * + * @sa rd_kafka_consume_callback() + * + * @deprecated This API is deprecated and subject for future removal. + * There is no new callback-based consume interface, use the + * poll/queue based alternatives. + */ +RD_EXPORT +int rd_kafka_consume_callback_queue( + rd_kafka_queue_t *rkqu, + int timeout_ms, + void (*consume_cb)(rd_kafka_message_t *rkmessage, void *commit_opaque), + void *commit_opaque); + + +/**@}*/ + + + +/** + * @name Simple Consumer API (legacy): Topic+partition offset store. + * @{ + * + * If \c auto.commit.enable is true the offset is stored automatically prior to + * returning of the message(s) in each of the rd_kafka_consume*() functions + * above. + */ + + +/** + * @brief Store offset \p offset + 1 for topic \p rkt partition \p partition. + * + * The \c offset + 1 will be committed (written) to broker (or file) according + * to \c `auto.commit.interval.ms` or manual offset-less commit() + * + * @deprecated This API lacks support for partition leader epochs, which makes + * it at risk for unclean leader election log truncation issues. + * Use rd_kafka_offsets_store() and rd_kafka_offset_store_message() + * instead. + * + * @warning This method may only be called for partitions that are currently + * assigned. + * Non-assigned partitions will fail with RD_KAFKA_RESP_ERR__STATE. + * Since v1.9.0. + * + * @warning Avoid storing offsets after calling rd_kafka_seek() (et.al) as + * this may later interfere with resuming a paused partition, instead + * store offsets prior to calling seek. + * + * @remark \c `enable.auto.offset.store` must be set to "false" when using + * this API. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or an error code on error. + */ +RD_EXPORT +rd_kafka_resp_err_t +rd_kafka_offset_store(rd_kafka_topic_t *rkt, int32_t partition, int64_t offset); + + +/** + * @brief Store offsets for next auto-commit for one or more partitions. + * + * The offset will be committed (written) to the offset store according + * to \c `auto.commit.interval.ms` or manual offset-less commit(). + * + * Per-partition success/error status propagated through each partition's + * \c .err for all return values (even NO_ERROR) except INVALID_ARG. + * + * @warning This method may only be called for partitions that are currently + * assigned. + * Non-assigned partitions will fail with RD_KAFKA_RESP_ERR__STATE. + * Since v1.9.0. + * + * @warning Avoid storing offsets after calling rd_kafka_seek() (et.al) as + * this may later interfere with resuming a paused partition, instead + * store offsets prior to calling seek. + * + * @remark The \c .offset field is stored as is, it will NOT be + 1. + * + * @remark \c `enable.auto.offset.store` must be set to "false" when using + * this API. + * + * @remark The leader epoch, if set, will be used to fence outdated partition + * leaders. See rd_kafka_topic_partition_set_leader_epoch(). + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on (partial) success, or + * RD_KAFKA_RESP_ERR__INVALID_ARG if \c enable.auto.offset.store + * is true, or + * RD_KAFKA_RESP_ERR__UNKNOWN_PARTITION or RD_KAFKA_RESP_ERR__STATE + * if none of the offsets could be stored. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_offsets_store(rd_kafka_t *rk, + rd_kafka_topic_partition_list_t *offsets); + + +/** + * @brief Store offset +1 for the consumed message. + * + * The message offset + 1 will be committed to broker according + * to \c `auto.commit.interval.ms` or manual offset-less commit() + * + * @warning This method may only be called for partitions that are currently + * assigned. + * Non-assigned partitions will fail with RD_KAFKA_RESP_ERR__STATE. + * Since v1.9.0. + * + * @warning Avoid storing offsets after calling rd_kafka_seek() (et.al) as + * this may later interfere with resuming a paused partition, instead + * store offsets prior to calling seek. + * + * @remark \c `enable.auto.offset.store` must be set to "false" when using + * this API. + * + * @returns NULL on success or an error object on failure. + */ +RD_EXPORT +rd_kafka_error_t *rd_kafka_offset_store_message(rd_kafka_message_t *rkmessage); + +/**@}*/ + + + +/** + * @name KafkaConsumer (C) + * @brief High-level KafkaConsumer C API + * @{ + * + * + * + */ + +/** + * @brief Subscribe to topic set using balanced consumer groups. + * + * Wildcard (regex) topics are supported: + * any topic name in the \p topics list that is prefixed with \c \"^\" will + * be regex-matched to the full list of topics in the cluster and matching + * topics will be added to the subscription list. + * + * The full topic list is retrieved every \c topic.metadata.refresh.interval.ms + * to pick up new or delete topics that match the subscription. + * If there is any change to the matched topics the consumer will + * immediately rejoin the group with the updated set of subscribed topics. + * + * Regex and full topic names can be mixed in \p topics. + * + * @remark Only the \c .topic field is used in the supplied \p topics list, + * all other fields are ignored. + * + * @remark subscribe() is an asynchronous method which returns immediately: + * background threads will (re)join the group, wait for group rebalance, + * issue any registered rebalance_cb, assign() the assigned partitions, + * and then start fetching messages. This cycle may take up to + * \c session.timeout.ms * 2 or more to complete. + * + * @remark After this call returns a consumer error will be returned by + * rd_kafka_consumer_poll (et.al) for each unavailable topic in the + * \p topics. The error will be RD_KAFKA_RESP_ERR_UNKNOWN_TOPIC_OR_PART + * for non-existent topics, and + * RD_KAFKA_RESP_ERR_TOPIC_AUTHORIZATION_FAILED for unauthorized topics. + * The consumer error will be raised through rd_kafka_consumer_poll() + * (et.al.) with the \c rd_kafka_message_t.err field set to one of the + * error codes mentioned above. + * The subscribe function itself is asynchronous and will not return + * an error on unavailable topics. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or + * RD_KAFKA_RESP_ERR__INVALID_ARG if list is empty, contains invalid + * topics or regexes or duplicate entries, + * RD_KAFKA_RESP_ERR__FATAL if the consumer has raised a fatal error. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_subscribe(rd_kafka_t *rk, + const rd_kafka_topic_partition_list_t *topics); + + +/** + * @brief Unsubscribe from the current subscription set. + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_unsubscribe(rd_kafka_t *rk); + + +/** + * @brief Returns the current topic subscription + * + * @returns An error code on failure, otherwise \p topic is updated + * to point to a newly allocated topic list (possibly empty). + * + * @remark The application is responsible for calling + * rd_kafka_topic_partition_list_destroy on the returned list. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_subscription(rd_kafka_t *rk, rd_kafka_topic_partition_list_t **topics); + + + +/** + * @brief Poll the consumer for messages or events. + * + * Will block for at most \p timeout_ms milliseconds. + * + * @remark An application should make sure to call consumer_poll() at regular + * intervals, even if no messages are expected, to serve any + * queued callbacks waiting to be called. This is especially + * important when a rebalance_cb has been registered as it needs + * to be called and handled properly to synchronize internal + * consumer state. + * + * @returns A message object which is a proper message if \p ->err is + * RD_KAFKA_RESP_ERR_NO_ERROR, or an event or error for any other + * value. + * + * @remark on_consume() interceptors may be called from this function prior to + * passing message to application. + * + * @remark When subscribing to topics the application must call poll at + * least every \c max.poll.interval.ms to remain a member of the + * consumer group. + * + * Noteworthy errors returned in \c ->err: + * - RD_KAFKA_RESP_ERR__MAX_POLL_EXCEEDED - application failed to call + * poll within `max.poll.interval.ms`. + * + * @sa rd_kafka_message_t + */ +RD_EXPORT +rd_kafka_message_t *rd_kafka_consumer_poll(rd_kafka_t *rk, int timeout_ms); + +/** + * @brief Close the consumer. + * + * This call will block until the consumer has revoked its assignment, + * calling the \c rebalance_cb if it is configured, committed offsets + * to broker, and left the consumer group (if applicable). + * The maximum blocking time is roughly limited to session.timeout.ms. + * + * @returns An error code indicating if the consumer close was succesful + * or not. + * RD_KAFKA_RESP_ERR__FATAL is returned if the consumer has raised + * a fatal error. + * + * @remark The application still needs to call rd_kafka_destroy() after + * this call finishes to clean up the underlying handle resources. + * + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_consumer_close(rd_kafka_t *rk); + + +/** + * @brief Asynchronously close the consumer. + * + * Performs the same actions as rd_kafka_consumer_close() but in a + * background thread. + * + * Rebalance events/callbacks (etc) will be forwarded to the + * application-provided \p rkqu. The application must poll/serve this queue + * until rd_kafka_consumer_closed() returns true. + * + * @remark Depending on consumer group join state there may or may not be + * rebalance events emitted on \p rkqu. + * + * @returns an error object if the consumer close failed, else NULL. + * + * @sa rd_kafka_consumer_closed() + */ +RD_EXPORT +rd_kafka_error_t *rd_kafka_consumer_close_queue(rd_kafka_t *rk, + rd_kafka_queue_t *rkqu); + + +/** + * @returns 1 if the consumer is closed, else 0. + * + * Should be used in conjunction with rd_kafka_consumer_close_queue() to know + * when the consumer has been closed. + * + * @sa rd_kafka_consumer_close_queue() + */ +RD_EXPORT +int rd_kafka_consumer_closed(rd_kafka_t *rk); + + +/** + * @brief Incrementally add \p partitions to the current assignment. + * + * If a COOPERATIVE assignor (i.e. incremental rebalancing) is being used, + * this method should be used in a rebalance callback to adjust the current + * assignment appropriately in the case where the rebalance type is + * RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS. The application must pass the + * partition list passed to the callback (or a copy of it), even if the + * list is empty. \p partitions must not be NULL. This method may also be + * used outside the context of a rebalance callback. + * + * @returns NULL on success, or an error object if the operation was + * unsuccessful. + * + * @remark The returned error object (if not NULL) must be destroyed with + * rd_kafka_error_destroy(). + */ +RD_EXPORT rd_kafka_error_t * +rd_kafka_incremental_assign(rd_kafka_t *rk, + const rd_kafka_topic_partition_list_t *partitions); + + +/** + * @brief Incrementally remove \p partitions from the current assignment. + * + * If a COOPERATIVE assignor (i.e. incremental rebalancing) is being used, + * this method should be used in a rebalance callback to adjust the current + * assignment appropriately in the case where the rebalance type is + * RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS. The application must pass the + * partition list passed to the callback (or a copy of it), even if the + * list is empty. \p partitions must not be NULL. This method may also be + * used outside the context of a rebalance callback. + * + * @returns NULL on success, or an error object if the operation was + * unsuccessful. + * + * @remark The returned error object (if not NULL) must be destroyed with + * rd_kafka_error_destroy(). + */ +RD_EXPORT rd_kafka_error_t *rd_kafka_incremental_unassign( + rd_kafka_t *rk, + const rd_kafka_topic_partition_list_t *partitions); + + +/** + * @brief The rebalance protocol currently in use. This will be + * "NONE" if the consumer has not (yet) joined a group, else it will + * match the rebalance protocol ("EAGER", "COOPERATIVE") of the + * configured and selected assignor(s). All configured + * assignors must have the same protocol type, meaning + * online migration of a consumer group from using one + * protocol to another (in particular upgading from EAGER + * to COOPERATIVE) without a restart is not currently + * supported. + * + * @returns NULL on error, or one of "NONE", "EAGER", "COOPERATIVE" on success. + */ +RD_EXPORT +const char *rd_kafka_rebalance_protocol(rd_kafka_t *rk); + + +/** + * @brief Atomic assignment of partitions to consume. + * + * The new \p partitions will replace the existing assignment. + * + * A zero-length \p partitions will treat the partitions as a valid, + * albeit empty assignment, and maintain internal state, while a \c NULL + * value for \p partitions will reset and clear the internal state. + * + * When used from a rebalance callback, the application should pass the + * partition list passed to the callback (or a copy of it) even if the list + * is empty (i.e. should not pass NULL in this case) so as to maintain + * internal join state. This is not strictly required - the application + * may adjust the assignment provided by the group. However, this is rarely + * useful in practice. + * + * @returns An error code indicating if the new assignment was applied or not. + * RD_KAFKA_RESP_ERR__FATAL is returned if the consumer has raised + * a fatal error. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_assign(rd_kafka_t *rk, + const rd_kafka_topic_partition_list_t *partitions); + +/** + * @brief Returns the current partition assignment as set by rd_kafka_assign() + * or rd_kafka_incremental_assign(). + * + * @returns An error code on failure, otherwise \p partitions is updated + * to point to a newly allocated partition list (possibly empty). + * + * @remark The application is responsible for calling + * rd_kafka_topic_partition_list_destroy on the returned list. + * + * @remark This assignment represents the partitions assigned through the + * assign functions and not the partitions assigned to this consumer + * instance by the consumer group leader. + * They are usually the same following a rebalance but not necessarily + * since an application is free to assign any partitions. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_assignment(rd_kafka_t *rk, + rd_kafka_topic_partition_list_t **partitions); + + +/** + * @brief Check whether the consumer considers the current assignment to + * have been lost involuntarily. This method is only applicable for + * use with a high level subscribing consumer. Assignments are revoked + * immediately when determined to have been lost, so this method + * is only useful when reacting to a RD_KAFKA_EVENT_REBALANCE event + * or from within a rebalance_cb. Partitions that have been lost may + * already be owned by other members in the group and therefore + * commiting offsets, for example, may fail. + * + * @remark Calling rd_kafka_assign(), rd_kafka_incremental_assign() or + * rd_kafka_incremental_unassign() resets this flag. + * + * @returns Returns 1 if the current partition assignment is considered + * lost, 0 otherwise. + */ +RD_EXPORT int rd_kafka_assignment_lost(rd_kafka_t *rk); + + +/** + * @brief Commit offsets on broker for the provided list of partitions. + * + * \p offsets should contain \c topic, \c partition, \c offset and possibly + * \c metadata. The \c offset should be the offset where consumption will + * resume, i.e., the last processed offset + 1. + * If \p offsets is NULL the current partition assignment will be used instead. + * + * If \p async is false this operation will block until the broker offset commit + * is done, returning the resulting success or error code. + * + * If a rd_kafka_conf_set_offset_commit_cb() offset commit callback has been + * configured the callback will be enqueued for a future call to + * rd_kafka_poll(), rd_kafka_consumer_poll() or similar. + * + * @returns An error code indiciating if the commit was successful, + * or successfully scheduled if asynchronous, or failed. + * RD_KAFKA_RESP_ERR__FATAL is returned if the consumer has raised + * a fatal error. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_commit(rd_kafka_t *rk, + const rd_kafka_topic_partition_list_t *offsets, + int async); + + +/** + * @brief Commit message's offset on broker for the message's partition. + * The committed offset is the message's offset + 1. + * + * @sa rd_kafka_commit + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_commit_message(rd_kafka_t *rk, + const rd_kafka_message_t *rkmessage, + int async); + + +/** + * @brief Commit offsets on broker for the provided list of partitions. + * + * See rd_kafka_commit for \p offsets semantics. + * + * The result of the offset commit will be posted on the provided \p rkqu queue. + * + * If the application uses one of the poll APIs (rd_kafka_poll(), + * rd_kafka_consumer_poll(), rd_kafka_queue_poll(), ..) to serve the queue + * the \p cb callback is required. + * + * The \p commit_opaque argument is passed to the callback as \p commit_opaque, + * or if using the event API the callback is ignored and the offset commit + * result will be returned as an RD_KAFKA_EVENT_COMMIT event and the + * \p commit_opaque value will be available with rd_kafka_event_opaque(). + * + * If \p rkqu is NULL a temporary queue will be created and the callback will + * be served by this call. + * + * @sa rd_kafka_commit() + * @sa rd_kafka_conf_set_offset_commit_cb() + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_commit_queue(rd_kafka_t *rk, + const rd_kafka_topic_partition_list_t *offsets, + rd_kafka_queue_t *rkqu, + void (*cb)(rd_kafka_t *rk, + rd_kafka_resp_err_t err, + rd_kafka_topic_partition_list_t *offsets, + void *commit_opaque), + void *commit_opaque); + + +/** + * @brief Retrieve committed offsets for topics+partitions. + * + * The \p offset field of each requested partition will either be set to + * stored offset or to RD_KAFKA_OFFSET_INVALID in case there was no stored + * offset for that partition. + * + * Committed offsets will be returned according to the `isolation.level` + * configuration property, if set to `read_committed` (default) then only + * stable offsets for fully committed transactions will be returned, while + * `read_uncommitted` may return offsets for not yet committed transactions. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success in which case the + * \p offset or \p err field of each \p partitions' element is filled + * in with the stored offset, or a partition specific error. + * Else returns an error code. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_committed(rd_kafka_t *rk, + rd_kafka_topic_partition_list_t *partitions, + int timeout_ms); + + + +/** + * @brief Retrieve current positions (offsets) for topics+partitions. + * + * The \p offset field of each requested partition will be set to the offset + * of the last consumed message + 1, or RD_KAFKA_OFFSET_INVALID in case there + * was no previous message. + * + * @remark In this context the last consumed message is the offset consumed + * by the current librdkafka instance and, in case of rebalancing, not + * necessarily the last message fetched from the partition. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success in which case the + * \p offset or \p err field of each \p partitions' element is filled + * in with the stored offset, or a partition specific error. + * Else returns an error code. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_position(rd_kafka_t *rk, rd_kafka_topic_partition_list_t *partitions); + + + +/** + * @returns the current consumer group metadata associated with this consumer, + * or NULL if \p rk is not a consumer configured with a \c group.id. + * This metadata object should be passed to the transactional + * producer's rd_kafka_send_offsets_to_transaction() API. + * + * @remark The returned pointer must be freed by the application using + * rd_kafka_consumer_group_metadata_destroy(). + * + * @sa rd_kafka_send_offsets_to_transaction() + */ +RD_EXPORT rd_kafka_consumer_group_metadata_t * +rd_kafka_consumer_group_metadata(rd_kafka_t *rk); + + +/** + * @brief Create a new consumer group metadata object. + * This is typically only used for writing tests. + * + * @param group_id The group id. + * + * @remark The returned pointer must be freed by the application using + * rd_kafka_consumer_group_metadata_destroy(). + */ +RD_EXPORT rd_kafka_consumer_group_metadata_t * +rd_kafka_consumer_group_metadata_new(const char *group_id); + + +/** + * @brief Create a new consumer group metadata object. + * This is typically only used for writing tests. + * + * @param group_id The group id. + * @param generation_id The group generation id. + * @param member_id The group member id. + * @param group_instance_id The group instance id (may be NULL). + * + * @remark The returned pointer must be freed by the application using + * rd_kafka_consumer_group_metadata_destroy(). + */ +RD_EXPORT rd_kafka_consumer_group_metadata_t * +rd_kafka_consumer_group_metadata_new_with_genid(const char *group_id, + int32_t generation_id, + const char *member_id, + const char *group_instance_id); + + +/** + * @brief Frees the consumer group metadata object as returned by + * rd_kafka_consumer_group_metadata(). + */ +RD_EXPORT void +rd_kafka_consumer_group_metadata_destroy(rd_kafka_consumer_group_metadata_t *); + + +/** + * @brief Serialize the consumer group metadata to a binary format. + * This is mainly for client binding use and not for application use. + * + * @remark The serialized metadata format is private and is not compatible + * across different versions or even builds of librdkafka. + * It should only be used in the same process runtime and must only + * be passed to rd_kafka_consumer_group_metadata_read(). + * + * @param cgmd Metadata to be serialized. + * @param bufferp On success this pointer will be updated to point to na + * allocated buffer containing the serialized metadata. + * The buffer must be freed with rd_kafka_mem_free(). + * @param sizep The pointed to size will be updated with the size of + * the serialized buffer. + * + * @returns NULL on success or an error object on failure. + * + * @sa rd_kafka_consumer_group_metadata_read() + */ +RD_EXPORT rd_kafka_error_t *rd_kafka_consumer_group_metadata_write( + const rd_kafka_consumer_group_metadata_t *cgmd, + void **bufferp, + size_t *sizep); + +/** + * @brief Reads serialized consumer group metadata and returns a + * consumer group metadata object. + * This is mainly for client binding use and not for application use. + * + * @remark The serialized metadata format is private and is not compatible + * across different versions or even builds of librdkafka. + * It should only be used in the same process runtime and must only + * be passed to rd_kafka_consumer_group_metadata_read(). + * + * @param cgmdp On success this pointer will be updated to point to a new + * consumer group metadata object which must be freed with + * rd_kafka_consumer_group_metadata_destroy(). + * @param buffer Pointer to the serialized data. + * @param size Size of the serialized data. + * + * @returns NULL on success or an error object on failure. + * + * @sa rd_kafka_consumer_group_metadata_write() + */ +RD_EXPORT rd_kafka_error_t *rd_kafka_consumer_group_metadata_read( + rd_kafka_consumer_group_metadata_t **cgmdp, + const void *buffer, + size_t size); + +/**@}*/ + + + +/** + * @name Producer API + * @{ + * + * + */ + + +/** + * @brief Producer message flags + */ +#define RD_KAFKA_MSG_F_FREE \ + 0x1 /**< Delegate freeing of payload to rdkafka. \ + */ +#define RD_KAFKA_MSG_F_COPY \ + 0x2 /**< rdkafka will make a copy of the payload. \ + */ +#define RD_KAFKA_MSG_F_BLOCK \ + 0x4 /**< Block produce*() on message queue full. \ + * WARNING: If a delivery report callback \ + * is used, the application MUST \ + * call rd_kafka_poll() (or equiv.) \ + * to make sure delivered messages \ + * are drained from the internal \ + * delivery report queue. \ + * Failure to do so will result \ + * in indefinitely blocking on \ + * the produce() call when the \ + * message queue is full. */ +#define RD_KAFKA_MSG_F_PARTITION \ + 0x8 /**< produce_batch() will honor \ + * per-message partition. */ + + + +/** + * @brief Produce and send a single message to broker. + * + * \p rkt is the target topic which must have been previously created with + * `rd_kafka_topic_new()`. + * + * `rd_kafka_produce()` is an asynchronous non-blocking API. + * See `rd_kafka_conf_set_dr_msg_cb` on how to setup a callback to be called + * once the delivery status (success or failure) is known. The delivery report + * is triggered by the application calling `rd_kafka_poll()` (at regular + * intervals) or `rd_kafka_flush()` (at termination). + * + * Since producing is asynchronous, you should call `rd_kafka_flush()` before + * you destroy the producer. Otherwise, any outstanding messages will be + * silently discarded. + * + * When temporary errors occur, librdkafka automatically retries to produce the + * messages. Retries are triggered after retry.backoff.ms and when the + * leader broker for the given partition is available. Otherwise, librdkafka + * falls back to polling the topic metadata to monitor when a new leader is + * elected (see the topic.metadata.refresh.fast.interval.ms and + * topic.metadata.refresh.interval.ms configurations) and then performs a + * retry. A delivery error will occur if the message could not be produced + * within message.timeout.ms. + * + * See the "Message reliability" chapter in INTRODUCTION.md for more + * information. + * + * \p partition is the target partition, either: + * - RD_KAFKA_PARTITION_UA (unassigned) for + * automatic partitioning using the topic's partitioner function, or + * - a fixed partition (0..N) + * + * \p msgflags is zero or more of the following flags OR:ed together: + * RD_KAFKA_MSG_F_BLOCK - block \p produce*() call if + * \p queue.buffering.max.messages or + * \p queue.buffering.max.kbytes are exceeded. + * Messages are considered in-queue from the point + * they are accepted by produce() until their corresponding delivery report + * callback/event returns. It is thus a requirement to call rd_kafka_poll() (or + * equiv.) from a separate thread when F_BLOCK is used. See WARNING on \c + * RD_KAFKA_MSG_F_BLOCK above. + * + * RD_KAFKA_MSG_F_FREE - rdkafka will free(3) \p payload when it is done + * with it. + * RD_KAFKA_MSG_F_COPY - the \p payload data will be copied and the + * \p payload pointer will not be used by rdkafka + * after the call returns. + * RD_KAFKA_MSG_F_PARTITION - produce_batch() will honour per-message + * partition, either set manually or by the + * configured partitioner. + * + * .._F_FREE and .._F_COPY are mutually exclusive. If neither of these are + * set, the caller must ensure that the memory backing \p payload remains + * valid and is not modified or reused until the delivery callback is + * invoked. Other buffers passed to `rd_kafka_produce()` don't have this + * restriction on reuse, i.e. the memory backing the key or the topic name + * may be reused as soon as `rd_kafka_produce()` returns. + * + * If the function returns -1 and RD_KAFKA_MSG_F_FREE was specified, then + * the memory associated with the payload is still the caller's + * responsibility. + * + * \p payload is the message payload of size \p len bytes. + * + * \p key is an optional message key of size \p keylen bytes, if non-NULL it + * will be passed to the topic partitioner as well as be sent with the + * message to the broker and passed on to the consumer. + * + * \p msg_opaque is an optional application-provided per-message opaque + * pointer that will provided in the message's delivery report callback + * (\c dr_msg_cb or \c dr_cb) and the \c rd_kafka_message_t \c _private field. + * + * @remark on_send() and on_acknowledgement() interceptors may be called + * from this function. on_acknowledgement() will only be called if the + * message fails partitioning. + * + * @remark If the producer is transactional (\c transactional.id is configured) + * producing is only allowed during an on-going transaction, namely + * after rd_kafka_begin_transaction() has been called. + * + * @returns 0 on success or -1 on error in which case errno is set accordingly: + * - ENOBUFS - maximum number of outstanding messages has been reached: + * "queue.buffering.max.messages" + * (RD_KAFKA_RESP_ERR__QUEUE_FULL) + * - EMSGSIZE - message is larger than configured max size: + * "messages.max.bytes". + * (RD_KAFKA_RESP_ERR_MSG_SIZE_TOO_LARGE) + * - ESRCH - requested \p partition is unknown in the Kafka cluster. + * (RD_KAFKA_RESP_ERR__UNKNOWN_PARTITION) + * - ENOENT - topic is unknown in the Kafka cluster. + * (RD_KAFKA_RESP_ERR__UNKNOWN_TOPIC) + * - ECANCELED - fatal error has been raised on producer, see + * rd_kafka_fatal_error(), + * (RD_KAFKA_RESP_ERR__FATAL). + * - ENOEXEC - transactional state forbids producing + * (RD_KAFKA_RESP_ERR__STATE) + * + * @sa Use rd_kafka_errno2err() to convert `errno` to rdkafka error code. + */ +RD_EXPORT +int rd_kafka_produce(rd_kafka_topic_t *rkt, + int32_t partition, + int msgflags, + void *payload, + size_t len, + const void *key, + size_t keylen, + void *msg_opaque); + + +/** + * @brief Produce and send a single message to broker. + * + * The message is defined by a va-arg list using \c rd_kafka_vtype_t + * tag tuples which must be terminated with a single \c RD_KAFKA_V_END. + * + * @returns \c RD_KAFKA_RESP_ERR_NO_ERROR on success, else an error code as + * described in rd_kafka_produce(). + * \c RD_KAFKA_RESP_ERR__CONFLICT is returned if _V_HEADER and + * _V_HEADERS are mixed. + * + * @sa rd_kafka_produce, rd_kafka_produceva, RD_KAFKA_V_END + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_producev(rd_kafka_t *rk, ...); + + +/** + * @brief Produce and send a single message to broker. + * + * The message is defined by an array of \c rd_kafka_vu_t of + * count \p cnt. + * + * @returns an error object on failure or NULL on success. + * See rd_kafka_producev() for specific error codes. + * + * @sa rd_kafka_produce, rd_kafka_producev, RD_KAFKA_V_END + */ +RD_EXPORT +rd_kafka_error_t * +rd_kafka_produceva(rd_kafka_t *rk, const rd_kafka_vu_t *vus, size_t cnt); + + +/** + * @brief Produce multiple messages. + * + * If partition is RD_KAFKA_PARTITION_UA the configured partitioner will + * be run for each message (slower), otherwise the messages will be enqueued + * to the specified partition directly (faster). + * + * The messages are provided in the array \p rkmessages of count \p message_cnt + * elements. + * The \p partition and \p msgflags are used for all provided messages. + * + * Honoured \p rkmessages[] fields are: + * - payload,len Message payload and length + * - key,key_len Optional message key + * - _private Message opaque pointer (msg_opaque) + * - err Will be set according to success or failure, see + * rd_kafka_produce() for possible error codes. + * Application only needs to check for errors if + * return value != \p message_cnt. + * + * @remark If \c RD_KAFKA_MSG_F_PARTITION is set in \p msgflags, the + * \c .partition field of the \p rkmessages is used instead of + * \p partition. + * + * @returns the number of messages succesfully enqueued for producing. + * + * @remark This interface does NOT support setting message headers on + * the provided \p rkmessages. + */ +RD_EXPORT +int rd_kafka_produce_batch(rd_kafka_topic_t *rkt, + int32_t partition, + int msgflags, + rd_kafka_message_t *rkmessages, + int message_cnt); + + + +/** + * @brief Wait until all outstanding produce requests, et.al, are completed. + * This should typically be done prior to destroying a producer instance + * to make sure all queued and in-flight produce requests are completed + * before terminating. + * + * @remark This function will call rd_kafka_poll() and thus trigger callbacks. + * + * @remark The \c linger.ms time will be ignored for the duration of the call, + * queued messages will be sent to the broker as soon as possible. + * + * @remark If RD_KAFKA_EVENT_DR has been enabled + * (through rd_kafka_conf_set_events()) this function will not call + * rd_kafka_poll() but instead wait for the librdkafka-handled + * message count to reach zero. This requires the application to + * serve the event queue in a separate thread. + * In this mode only messages are counted, not other types of + * queued events. + * + * @returns RD_KAFKA_RESP_ERR__TIMED_OUT if \p timeout_ms was reached before all + * outstanding requests were completed, else RD_KAFKA_RESP_ERR_NO_ERROR + * + * @sa rd_kafka_outq_len() + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_flush(rd_kafka_t *rk, int timeout_ms); + + + +/** + * @brief Purge messages currently handled by the producer instance. + * + * @param rk Client instance. + * @param purge_flags Tells which messages to purge and how. + * + * The application will need to call rd_kafka_poll() or rd_kafka_flush() + * afterwards to serve the delivery report callbacks of the purged messages. + * + * Messages purged from internal queues fail with the delivery report + * error code set to RD_KAFKA_RESP_ERR__PURGE_QUEUE, while purged messages that + * are in-flight to or from the broker will fail with the error code set to + * RD_KAFKA_RESP_ERR__PURGE_INFLIGHT. + * + * @warning Purging messages that are in-flight to or from the broker + * will ignore any subsequent acknowledgement for these messages + * received from the broker, effectively making it impossible + * for the application to know if the messages were successfully + * produced or not. This may result in duplicate messages if the + * application retries these messages at a later time. + * + * @remark This call may block for a short time while background thread + * queues are purged. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success, + * RD_KAFKA_RESP_ERR__INVALID_ARG if the \p purge flags are invalid + * or unknown, + * RD_KAFKA_RESP_ERR__NOT_IMPLEMENTED if called on a non-producer + * client instance. + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_purge(rd_kafka_t *rk, int purge_flags); + + +/** + * @brief Flags for rd_kafka_purge() + */ + +/*! + * Purge messages in internal queues. + */ +#define RD_KAFKA_PURGE_F_QUEUE 0x1 + +/*! + * Purge messages in-flight to or from the broker. + * Purging these messages will void any future acknowledgements from the + * broker, making it impossible for the application to know if these + * messages were successfully delivered or not. + * Retrying these messages may lead to duplicates. + */ +#define RD_KAFKA_PURGE_F_INFLIGHT 0x2 + + +/*! + * Don't wait for background thread queue purging to finish. + */ +#define RD_KAFKA_PURGE_F_NON_BLOCKING 0x4 + + +/**@}*/ + + +/** + * @name Metadata API + * @{ + * + * + */ + + +/** + * @brief Broker information + */ +typedef struct rd_kafka_metadata_broker { + int32_t id; /**< Broker Id */ + char *host; /**< Broker hostname */ + int port; /**< Broker listening port */ +} rd_kafka_metadata_broker_t; + +/** + * @brief Partition information + */ +typedef struct rd_kafka_metadata_partition { + int32_t id; /**< Partition Id */ + rd_kafka_resp_err_t err; /**< Partition error reported by broker */ + int32_t leader; /**< Leader broker */ + int replica_cnt; /**< Number of brokers in \p replicas */ + int32_t *replicas; /**< Replica brokers */ + int isr_cnt; /**< Number of ISR brokers in \p isrs */ + int32_t *isrs; /**< In-Sync-Replica brokers */ +} rd_kafka_metadata_partition_t; + +/** + * @brief Topic information + */ +typedef struct rd_kafka_metadata_topic { + char *topic; /**< Topic name */ + int partition_cnt; /**< Number of partitions in \p partitions*/ + struct rd_kafka_metadata_partition *partitions; /**< Partitions */ + rd_kafka_resp_err_t err; /**< Topic error reported by broker */ +} rd_kafka_metadata_topic_t; + + +/** + * @brief Metadata container + */ +typedef struct rd_kafka_metadata { + int broker_cnt; /**< Number of brokers in \p brokers */ + struct rd_kafka_metadata_broker *brokers; /**< Brokers */ + + int topic_cnt; /**< Number of topics in \p topics */ + struct rd_kafka_metadata_topic *topics; /**< Topics */ + + int32_t orig_broker_id; /**< Broker originating this metadata */ + char *orig_broker_name; /**< Name of originating broker */ +} rd_kafka_metadata_t; + +/** + * @brief Request Metadata from broker. + * + * Parameters: + * - \p all_topics if non-zero: request info about all topics in cluster, + * if zero: only request info about locally known topics. + * - \p only_rkt only request info about this topic + * - \p metadatap pointer to hold metadata result. + * The \p *metadatap pointer must be released + * with rd_kafka_metadata_destroy(). + * - \p timeout_ms maximum response time before failing. + * + * @remark Consumer: If \p all_topics is non-zero the Metadata response + * information may trigger a re-join if any subscribed topics + * have changed partition count or existence state. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success (in which case *metadatap) + * will be set, else RD_KAFKA_RESP_ERR__TIMED_OUT on timeout or + * other error code on error. + */ +RD_EXPORT +rd_kafka_resp_err_t +rd_kafka_metadata(rd_kafka_t *rk, + int all_topics, + rd_kafka_topic_t *only_rkt, + const struct rd_kafka_metadata **metadatap, + int timeout_ms); + +/** + * @brief Release metadata memory. + */ +RD_EXPORT +void rd_kafka_metadata_destroy(const struct rd_kafka_metadata *metadata); + +/** + * @brief Node (broker) information. + */ +typedef struct rd_kafka_Node_s rd_kafka_Node_t; + +/** + * @brief Get the id of \p node. + * + * @param node The Node instance. + * + * @return The node id. + */ +RD_EXPORT +int rd_kafka_Node_id(const rd_kafka_Node_t *node); + +/** + * @brief Get the host of \p node. + * + * @param node The Node instance. + * + * @return The node host. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p node object. + */ +RD_EXPORT +const char *rd_kafka_Node_host(const rd_kafka_Node_t *node); + +/** + * @brief Get the port of \p node. + * + * @param node The Node instance. + * + * @return The node port. + */ +RD_EXPORT +uint16_t rd_kafka_Node_port(const rd_kafka_Node_t *node); + +/**@}*/ + + + +/** + * @name Client group information + * @{ + * + * + */ + + +/** + * @brief Group member information + * + * For more information on \p member_metadata format, see + * https://cwiki.apache.org/confluence/display/KAFKA/A+Guide+To+The+Kafka+Protocol#AGuideToTheKafkaProtocol-GroupMembershipAPI + * + */ +struct rd_kafka_group_member_info { + char *member_id; /**< Member id (generated by broker) */ + char *client_id; /**< Client's \p client.id */ + char *client_host; /**< Client's hostname */ + void *member_metadata; /**< Member metadata (binary), + * format depends on \p protocol_type. */ + int member_metadata_size; /**< Member metadata size in bytes */ + void *member_assignment; /**< Member assignment (binary), + * format depends on \p protocol_type. */ + int member_assignment_size; /**< Member assignment size in bytes */ +}; + +/** + * @enum rd_kafka_consumer_group_state_t + * + * @brief Consumer group state. + */ +typedef enum { + RD_KAFKA_CONSUMER_GROUP_STATE_UNKNOWN = 0, + RD_KAFKA_CONSUMER_GROUP_STATE_PREPARING_REBALANCE = 1, + RD_KAFKA_CONSUMER_GROUP_STATE_COMPLETING_REBALANCE = 2, + RD_KAFKA_CONSUMER_GROUP_STATE_STABLE = 3, + RD_KAFKA_CONSUMER_GROUP_STATE_DEAD = 4, + RD_KAFKA_CONSUMER_GROUP_STATE_EMPTY = 5, + RD_KAFKA_CONSUMER_GROUP_STATE__CNT +} rd_kafka_consumer_group_state_t; + +/** + * @brief Group information + */ +struct rd_kafka_group_info { + struct rd_kafka_metadata_broker broker; /**< Originating broker info */ + char *group; /**< Group name */ + rd_kafka_resp_err_t err; /**< Broker-originated error */ + char *state; /**< Group state */ + char *protocol_type; /**< Group protocol type */ + char *protocol; /**< Group protocol */ + struct rd_kafka_group_member_info *members; /**< Group members */ + int member_cnt; /**< Group member count */ +}; + +/** + * @brief List of groups + * + * @sa rd_kafka_group_list_destroy() to release list memory. + */ +struct rd_kafka_group_list { + struct rd_kafka_group_info *groups; /**< Groups */ + int group_cnt; /**< Group count */ +}; + + +/** + * @brief List and describe client groups in cluster. + * + * \p group is an optional group name to describe, otherwise (\c NULL) all + * groups are returned. + * + * \p timeout_ms is the (approximate) maximum time to wait for response + * from brokers and must be a positive value. + * + * @returns \c RD_KAFKA_RESP_ERR__NO_ERROR on success and \p grplistp is + * updated to point to a newly allocated list of groups. + * \c RD_KAFKA_RESP_ERR__PARTIAL if not all brokers responded + * in time but at least one group is returned in \p grplistlp. + * \c RD_KAFKA_RESP_ERR__TIMED_OUT if no groups were returned in the + * given timeframe but not all brokers have yet responded, or + * if the list of brokers in the cluster could not be obtained within + * the given timeframe. + * \c RD_KAFKA_RESP_ERR__TRANSPORT if no brokers were found. + * Other error codes may also be returned from the request layer. + * + * The \p grplistp remains untouched if any error code is returned, + * with the exception of RD_KAFKA_RESP_ERR__PARTIAL which behaves + * as RD_KAFKA_RESP_ERR__NO_ERROR (success) but with an incomplete + * group list. + * + * @sa Use rd_kafka_group_list_destroy() to release list memory. + * + * @deprecated Use rd_kafka_ListConsumerGroups() and + * rd_kafka_DescribeConsumerGroups() instead. + */ +RD_EXPORT +rd_kafka_resp_err_t +rd_kafka_list_groups(rd_kafka_t *rk, + const char *group, + const struct rd_kafka_group_list **grplistp, + int timeout_ms); + +/** + * @brief Returns a name for a state code. + * + * @param state The state value. + * + * @return The group state name corresponding to the provided group state value. + */ +RD_EXPORT +const char * +rd_kafka_consumer_group_state_name(rd_kafka_consumer_group_state_t state); + +/** + * @brief Returns a code for a state name. + * + * @param name The state name. + * + * @return The group state value corresponding to the provided group state name. + */ +RD_EXPORT +rd_kafka_consumer_group_state_t +rd_kafka_consumer_group_state_code(const char *name); + +/** + * @brief Release list memory + */ +RD_EXPORT +void rd_kafka_group_list_destroy(const struct rd_kafka_group_list *grplist); + + +/**@}*/ + + + +/** + * @name Miscellaneous APIs + * @{ + * + */ + + +/** + * @brief Adds one or more brokers to the kafka handle's list of initial + * bootstrap brokers. + * + * Additional brokers will be discovered automatically as soon as rdkafka + * connects to a broker by querying the broker metadata. + * + * If a broker name resolves to multiple addresses (and possibly + * address families) all will be used for connection attempts in + * round-robin fashion. + * + * \p brokerlist is a ,-separated list of brokers in the format: + * \c \<broker1\>,\<broker2\>,.. + * Where each broker is in either the host or URL based format: + * \c \<host\>[:\<port\>] + * \c \<proto\>://\<host\>[:port] + * \c \<proto\> is either \c PLAINTEXT, \c SSL, \c SASL, \c SASL_PLAINTEXT + * The two formats can be mixed but ultimately the value of the + * `security.protocol` config property decides what brokers are allowed. + * + * Example: + * brokerlist = "broker1:10000,broker2" + * brokerlist = "SSL://broker3:9000,ssl://broker2" + * + * @returns the number of brokers successfully added. + * + * @remark Brokers may also be defined with the \c metadata.broker.list or + * \c bootstrap.servers configuration property (preferred method). + * + * @deprecated Set bootstrap servers with the \c bootstrap.servers + * configuration property. + */ +RD_EXPORT +int rd_kafka_brokers_add(rd_kafka_t *rk, const char *brokerlist); + + + +/** + * @brief Set logger function. + * + * The default is to print to stderr, but a syslog logger is also available, + * see rd_kafka_log_(print|syslog) for the builtin alternatives. + * Alternatively the application may provide its own logger callback. + * Or pass 'func' as NULL to disable logging. + * + * @deprecated Use rd_kafka_conf_set_log_cb() + * + * @remark \p rk may be passed as NULL in the callback. + */ +RD_EXPORT RD_DEPRECATED void +rd_kafka_set_logger(rd_kafka_t *rk, + void (*func)(const rd_kafka_t *rk, + int level, + const char *fac, + const char *buf)); + + +/** + * @brief Specifies the maximum logging level emitted by + * internal kafka logging and debugging. + * + * @deprecated Set the \c "log_level" configuration property instead. + * + * @remark If the \p \"debug\" configuration property is set the log level is + * automatically adjusted to \c LOG_DEBUG (7). + */ +RD_EXPORT +void rd_kafka_set_log_level(rd_kafka_t *rk, int level); + + +/** + * @brief Builtin (default) log sink: print to stderr + */ +RD_EXPORT +void rd_kafka_log_print(const rd_kafka_t *rk, + int level, + const char *fac, + const char *buf); + + +/** + * @brief Builtin log sink: print to syslog. + * @remark This logger is only available if librdkafka was built + * with syslog support. + */ +RD_EXPORT +void rd_kafka_log_syslog(const rd_kafka_t *rk, + int level, + const char *fac, + const char *buf); + + +/** + * @brief Returns the current out queue length. + * + * The out queue length is the sum of: + * - number of messages waiting to be sent to, or acknowledged by, + * the broker. + * - number of delivery reports (e.g., dr_msg_cb) waiting to be served + * by rd_kafka_poll() or rd_kafka_flush(). + * - number of callbacks (e.g., error_cb, stats_cb, etc) waiting to be + * served by rd_kafka_poll(), rd_kafka_consumer_poll() or rd_kafka_flush(). + * - number of events waiting to be served by background_event_cb() in + * the background queue (see rd_kafka_conf_set_background_event_cb). + * + * An application should wait for the return value of this function to reach + * zero before terminating to make sure outstanding messages, + * requests (such as offset commits), callbacks and events are fully processed. + * See rd_kafka_flush(). + * + * @returns number of messages and events waiting in queues. + * + * @sa rd_kafka_flush() + */ +RD_EXPORT +int rd_kafka_outq_len(rd_kafka_t *rk); + + + +/** + * @brief Dumps rdkafka's internal state for handle \p rk to stream \p fp + * + * This is only useful for debugging rdkafka, showing state and statistics + * for brokers, topics, partitions, etc. + */ +RD_EXPORT +void rd_kafka_dump(FILE *fp, rd_kafka_t *rk); + + + +/** + * @brief Retrieve the current number of threads in use by librdkafka. + * + * Used by regression tests. + */ +RD_EXPORT +int rd_kafka_thread_cnt(void); + + +/** + * @enum rd_kafka_thread_type_t + * + * @brief librdkafka internal thread type. + * + * @sa rd_kafka_interceptor_add_on_thread_start() + */ +typedef enum rd_kafka_thread_type_t { + RD_KAFKA_THREAD_MAIN, /**< librdkafka's internal main thread */ + RD_KAFKA_THREAD_BACKGROUND, /**< Background thread (if enabled) */ + RD_KAFKA_THREAD_BROKER /**< Per-broker thread */ +} rd_kafka_thread_type_t; + + +/** + * @brief Wait for all rd_kafka_t objects to be destroyed. + * + * Returns 0 if all kafka objects are now destroyed, or -1 if the + * timeout was reached. + * + * @remark This function is deprecated. + */ +RD_EXPORT +int rd_kafka_wait_destroyed(int timeout_ms); + + +/** + * @brief Run librdkafka's built-in unit-tests. + * + * @returns the number of failures, or 0 if all tests passed. + */ +RD_EXPORT +int rd_kafka_unittest(void); + + +/**@}*/ + + + +/** + * @name Experimental APIs + * @{ + */ + +/** + * @brief Redirect the main (rd_kafka_poll()) queue to the KafkaConsumer's + * queue (rd_kafka_consumer_poll()). + * + * @warning It is not permitted to call rd_kafka_poll() after directing the + * main queue with rd_kafka_poll_set_consumer(). + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_poll_set_consumer(rd_kafka_t *rk); + + +/**@}*/ + +/** + * @name Event interface + * + * @brief The event API provides an alternative pollable non-callback interface + * to librdkafka's message and event queues. + * + * @{ + */ + + +/** + * @brief Event types + */ +typedef int rd_kafka_event_type_t; +#define RD_KAFKA_EVENT_NONE 0x0 /**< Unset value */ +#define RD_KAFKA_EVENT_DR 0x1 /**< Producer Delivery report batch */ +#define RD_KAFKA_EVENT_FETCH 0x2 /**< Fetched message (consumer) */ +#define RD_KAFKA_EVENT_LOG 0x4 /**< Log message */ +#define RD_KAFKA_EVENT_ERROR 0x8 /**< Error */ +#define RD_KAFKA_EVENT_REBALANCE 0x10 /**< Group rebalance (consumer) */ +#define RD_KAFKA_EVENT_OFFSET_COMMIT 0x20 /**< Offset commit result */ +#define RD_KAFKA_EVENT_STATS 0x40 /**< Stats */ +#define RD_KAFKA_EVENT_CREATETOPICS_RESULT 100 /**< CreateTopics_result_t */ +#define RD_KAFKA_EVENT_DELETETOPICS_RESULT 101 /**< DeleteTopics_result_t */ +#define RD_KAFKA_EVENT_CREATEPARTITIONS_RESULT \ + 102 /**< CreatePartitions_result_t */ +#define RD_KAFKA_EVENT_ALTERCONFIGS_RESULT 103 /**< AlterConfigs_result_t */ +#define RD_KAFKA_EVENT_DESCRIBECONFIGS_RESULT \ + 104 /**< DescribeConfigs_result_t */ +#define RD_KAFKA_EVENT_DELETERECORDS_RESULT 105 /**< DeleteRecords_result_t */ +#define RD_KAFKA_EVENT_DELETEGROUPS_RESULT 106 /**< DeleteGroups_result_t */ +/** DeleteConsumerGroupOffsets_result_t */ +#define RD_KAFKA_EVENT_DELETECONSUMERGROUPOFFSETS_RESULT 107 +/** SASL/OAUTHBEARER token needs to be refreshed */ +#define RD_KAFKA_EVENT_OAUTHBEARER_TOKEN_REFRESH 0x100 +#define RD_KAFKA_EVENT_BACKGROUND 0x200 /**< Enable background thread. */ +#define RD_KAFKA_EVENT_CREATEACLS_RESULT 0x400 /**< CreateAcls_result_t */ +#define RD_KAFKA_EVENT_DESCRIBEACLS_RESULT 0x800 /**< DescribeAcls_result_t */ +#define RD_KAFKA_EVENT_DELETEACLS_RESULT 0x1000 /**< DeleteAcls_result_t */ +/** ListConsumerGroupsResult_t */ +#define RD_KAFKA_EVENT_LISTCONSUMERGROUPS_RESULT 0x2000 +/** DescribeConsumerGroups_result_t */ +#define RD_KAFKA_EVENT_DESCRIBECONSUMERGROUPS_RESULT 0x4000 +/** ListConsumerGroupOffsets_result_t */ +#define RD_KAFKA_EVENT_LISTCONSUMERGROUPOFFSETS_RESULT 0x8000 +/** AlterConsumerGroupOffsets_result_t */ +#define RD_KAFKA_EVENT_ALTERCONSUMERGROUPOFFSETS_RESULT 0x10000 + + +/** + * @returns the event type for the given event. + * + * @remark As a convenience it is okay to pass \p rkev as NULL in which case + * RD_KAFKA_EVENT_NONE is returned. + */ +RD_EXPORT +rd_kafka_event_type_t rd_kafka_event_type(const rd_kafka_event_t *rkev); + +/** + * @returns the event type's name for the given event. + * + * @remark As a convenience it is okay to pass \p rkev as NULL in which case + * the name for RD_KAFKA_EVENT_NONE is returned. + */ +RD_EXPORT +const char *rd_kafka_event_name(const rd_kafka_event_t *rkev); + + +/** + * @brief Destroy an event. + * + * @remark Any references to this event, such as extracted messages, + * will not be usable after this call. + * + * @remark As a convenience it is okay to pass \p rkev as NULL in which case + * no action is performed. + */ +RD_EXPORT +void rd_kafka_event_destroy(rd_kafka_event_t *rkev); + + +/** + * @returns the next message from an event. + * + * Call repeatedly until it returns NULL. + * + * Event types: + * - RD_KAFKA_EVENT_FETCH (1 message) + * - RD_KAFKA_EVENT_DR (>=1 message(s)) + * + * @remark The returned message(s) MUST NOT be + * freed with rd_kafka_message_destroy(). + * + * @remark on_consume() interceptor may be called + * from this function prior to passing message to application. + */ +RD_EXPORT +const rd_kafka_message_t *rd_kafka_event_message_next(rd_kafka_event_t *rkev); + + +/** + * @brief Extacts \p size message(s) from the event into the + * pre-allocated array \p rkmessages. + * + * Event types: + * - RD_KAFKA_EVENT_FETCH (1 message) + * - RD_KAFKA_EVENT_DR (>=1 message(s)) + * + * @returns the number of messages extracted. + * + * @remark on_consume() interceptor may be called + * from this function prior to passing message to application. + */ +RD_EXPORT +size_t rd_kafka_event_message_array(rd_kafka_event_t *rkev, + const rd_kafka_message_t **rkmessages, + size_t size); + + +/** + * @returns the number of remaining messages in the event. + * + * Event types: + * - RD_KAFKA_EVENT_FETCH (1 message) + * - RD_KAFKA_EVENT_DR (>=1 message(s)) + */ +RD_EXPORT +size_t rd_kafka_event_message_count(rd_kafka_event_t *rkev); + + +/** + * @returns the associated configuration string for the event, or NULL + * if the configuration property is not set or if + * not applicable for the given event type. + * + * The returned memory is read-only and its lifetime is the same as the + * event object. + * + * Event types: + * - RD_KAFKA_EVENT_OAUTHBEARER_TOKEN_REFRESH: value of sasl.oauthbearer.config + */ +RD_EXPORT +const char *rd_kafka_event_config_string(rd_kafka_event_t *rkev); + + +/** + * @returns the error code for the event. + * + * Use rd_kafka_event_error_is_fatal() to detect if this is a fatal error. + * + * Event types: + * - all + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_event_error(rd_kafka_event_t *rkev); + + +/** + * @returns the error string (if any). + * An application should check that rd_kafka_event_error() returns + * non-zero before calling this function. + * + * Event types: + * - all + */ +RD_EXPORT +const char *rd_kafka_event_error_string(rd_kafka_event_t *rkev); + + +/** + * @returns 1 if the error is a fatal error, else 0. + * + * Event types: + * - RD_KAFKA_EVENT_ERROR + * + * @sa rd_kafka_fatal_error() + */ +RD_EXPORT +int rd_kafka_event_error_is_fatal(rd_kafka_event_t *rkev); + + +/** + * @returns the event opaque (if any) as passed to rd_kafka_commit() (et.al) or + * rd_kafka_AdminOptions_set_opaque(), depending on event type. + * + * Event types: + * - RD_KAFKA_EVENT_OFFSET_COMMIT + * - RD_KAFKA_EVENT_CREATETOPICS_RESULT + * - RD_KAFKA_EVENT_DELETETOPICS_RESULT + * - RD_KAFKA_EVENT_CREATEPARTITIONS_RESULT + * - RD_KAFKA_EVENT_CREATEACLS_RESULT + * - RD_KAFKA_EVENT_DESCRIBEACLS_RESULT + * - RD_KAFKA_EVENT_DELETEACLS_RESULT + * - RD_KAFKA_EVENT_ALTERCONFIGS_RESULT + * - RD_KAFKA_EVENT_DESCRIBECONFIGS_RESULT + * - RD_KAFKA_EVENT_DELETEGROUPS_RESULT + * - RD_KAFKA_EVENT_DELETECONSUMERGROUPOFFSETS_RESULT + * - RD_KAFKA_EVENT_DELETERECORDS_RESULT + * - RD_KAFKA_EVENT_LISTCONSUMERGROUPS_RESULT + * - RD_KAFKA_EVENT_DESCRIBECONSUMERGROUPS_RESULT + * - RD_KAFKA_EVENT_LISTCONSUMERGROUPOFFSETS_RESULT + * - RD_KAFKA_EVENT_ALTERCONSUMERGROUPOFFSETS_RESULT + */ +RD_EXPORT +void *rd_kafka_event_opaque(rd_kafka_event_t *rkev); + + +/** + * @brief Extract log message from the event. + * + * Event types: + * - RD_KAFKA_EVENT_LOG + * + * @returns 0 on success or -1 if unsupported event type. + */ +RD_EXPORT +int rd_kafka_event_log(rd_kafka_event_t *rkev, + const char **fac, + const char **str, + int *level); + + +/** + * @brief Extract log debug context from event. + * + * Event types: + * - RD_KAFKA_EVENT_LOG + * + * @param rkev the event to extract data from. + * @param dst destination string for comma separated list. + * @param dstsize size of provided dst buffer. + * @returns 0 on success or -1 if unsupported event type. + */ +RD_EXPORT +int rd_kafka_event_debug_contexts(rd_kafka_event_t *rkev, + char *dst, + size_t dstsize); + + +/** + * @brief Extract stats from the event. + * + * Event types: + * - RD_KAFKA_EVENT_STATS + * + * @returns stats json string. + * + * @remark the returned string will be freed automatically along with the event + * object + * + */ +RD_EXPORT +const char *rd_kafka_event_stats(rd_kafka_event_t *rkev); + + +/** + * @returns the topic partition list from the event. + * + * @remark The list MUST NOT be freed with + * rd_kafka_topic_partition_list_destroy() + * + * Event types: + * - RD_KAFKA_EVENT_REBALANCE + * - RD_KAFKA_EVENT_OFFSET_COMMIT + */ +RD_EXPORT rd_kafka_topic_partition_list_t * +rd_kafka_event_topic_partition_list(rd_kafka_event_t *rkev); + + +/** + * @returns a newly allocated topic_partition container, if applicable for the + * event type, else NULL. + * + * @remark The returned pointer MUST be freed with + * rd_kafka_topic_partition_destroy(). + * + * Event types: + * RD_KAFKA_EVENT_ERROR (for partition level errors) + */ +RD_EXPORT rd_kafka_topic_partition_t * +rd_kafka_event_topic_partition(rd_kafka_event_t *rkev); + + +/*! CreateTopics result type */ +typedef rd_kafka_event_t rd_kafka_CreateTopics_result_t; +/*! DeleteTopics result type */ +typedef rd_kafka_event_t rd_kafka_DeleteTopics_result_t; +/*! CreateAcls result type */ +typedef rd_kafka_event_t rd_kafka_CreateAcls_result_t; +/*! DescribeAcls result type */ +typedef rd_kafka_event_t rd_kafka_DescribeAcls_result_t; +/*! DeleteAcls result type */ +typedef rd_kafka_event_t rd_kafka_DeleteAcls_result_t; +/*! CreatePartitions result type */ +typedef rd_kafka_event_t rd_kafka_CreatePartitions_result_t; +/*! AlterConfigs result type */ +typedef rd_kafka_event_t rd_kafka_AlterConfigs_result_t; +/*! CreateTopics result type */ +typedef rd_kafka_event_t rd_kafka_DescribeConfigs_result_t; +/*! DeleteRecords result type */ +typedef rd_kafka_event_t rd_kafka_DeleteRecords_result_t; +/*! ListConsumerGroups result type */ +typedef rd_kafka_event_t rd_kafka_ListConsumerGroups_result_t; +/*! DescribeConsumerGroups result type */ +typedef rd_kafka_event_t rd_kafka_DescribeConsumerGroups_result_t; +/*! DeleteGroups result type */ +typedef rd_kafka_event_t rd_kafka_DeleteGroups_result_t; +/*! DeleteConsumerGroupOffsets result type */ +typedef rd_kafka_event_t rd_kafka_DeleteConsumerGroupOffsets_result_t; +/*! AlterConsumerGroupOffsets result type */ +typedef rd_kafka_event_t rd_kafka_AlterConsumerGroupOffsets_result_t; +/*! ListConsumerGroupOffsets result type */ +typedef rd_kafka_event_t rd_kafka_ListConsumerGroupOffsets_result_t; + +/** + * @brief Get CreateTopics result. + * + * @returns the result of a CreateTopics request, or NULL if event is of + * different type. + * + * Event types: + * RD_KAFKA_EVENT_CREATETOPICS_RESULT + */ +RD_EXPORT const rd_kafka_CreateTopics_result_t * +rd_kafka_event_CreateTopics_result(rd_kafka_event_t *rkev); + +/** + * @brief Get DeleteTopics result. + * + * @returns the result of a DeleteTopics request, or NULL if event is of + * different type. + * + * Event types: + * RD_KAFKA_EVENT_DELETETOPICS_RESULT + */ +RD_EXPORT const rd_kafka_DeleteTopics_result_t * +rd_kafka_event_DeleteTopics_result(rd_kafka_event_t *rkev); + +/** + * @brief Get CreatePartitions result. + * + * @returns the result of a CreatePartitions request, or NULL if event is of + * different type. + * + * Event types: + * RD_KAFKA_EVENT_CREATEPARTITIONS_RESULT + */ +RD_EXPORT const rd_kafka_CreatePartitions_result_t * +rd_kafka_event_CreatePartitions_result(rd_kafka_event_t *rkev); + +/** + * @brief Get AlterConfigs result. + * + * @returns the result of a AlterConfigs request, or NULL if event is of + * different type. + * + * Event types: + * RD_KAFKA_EVENT_ALTERCONFIGS_RESULT + */ +RD_EXPORT const rd_kafka_AlterConfigs_result_t * +rd_kafka_event_AlterConfigs_result(rd_kafka_event_t *rkev); + +/** + * @brief Get DescribeConfigs result. + * + * @returns the result of a DescribeConfigs request, or NULL if event is of + * different type. + * + * Event types: + * RD_KAFKA_EVENT_DESCRIBECONFIGS_RESULT + */ +RD_EXPORT const rd_kafka_DescribeConfigs_result_t * +rd_kafka_event_DescribeConfigs_result(rd_kafka_event_t *rkev); + +/** + * @returns the result of a DeleteRecords request, or NULL if event is of + * different type. + * + * Event types: + * RD_KAFKA_EVENT_DELETERECORDS_RESULT + */ +RD_EXPORT const rd_kafka_DeleteRecords_result_t * +rd_kafka_event_DeleteRecords_result(rd_kafka_event_t *rkev); + +/** + * @brief Get ListConsumerGroups result. + * + * @returns the result of a ListConsumerGroups request, or NULL if event is of + * different type. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p rkev object. + * + * Event types: + * RD_KAFKA_EVENT_LISTCONSUMERGROUPS_RESULT + */ +RD_EXPORT const rd_kafka_ListConsumerGroups_result_t * +rd_kafka_event_ListConsumerGroups_result(rd_kafka_event_t *rkev); + +/** + * @brief Get DescribeConsumerGroups result. + * + * @returns the result of a DescribeConsumerGroups request, or NULL if event is + * of different type. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p rkev object. + * + * Event types: + * RD_KAFKA_EVENT_DESCRIBECONSUMERGROUPS_RESULT + */ +RD_EXPORT const rd_kafka_DescribeConsumerGroups_result_t * +rd_kafka_event_DescribeConsumerGroups_result(rd_kafka_event_t *rkev); + +/** + * @brief Get DeleteGroups result. + * + * @returns the result of a DeleteGroups request, or NULL if event is of + * different type. + * + * Event types: + * RD_KAFKA_EVENT_DELETEGROUPS_RESULT + */ +RD_EXPORT const rd_kafka_DeleteGroups_result_t * +rd_kafka_event_DeleteGroups_result(rd_kafka_event_t *rkev); + +/** + * @brief Get DeleteConsumerGroupOffsets result. + * + * @returns the result of a DeleteConsumerGroupOffsets request, or NULL if + * event is of different type. + * + * Event types: + * RD_KAFKA_EVENT_DELETECONSUMERGROUPOFFSETS_RESULT + */ +RD_EXPORT const rd_kafka_DeleteConsumerGroupOffsets_result_t * +rd_kafka_event_DeleteConsumerGroupOffsets_result(rd_kafka_event_t *rkev); + +/** + * @returns the result of a CreateAcls request, or NULL if event is of + * different type. + * + * Event types: + * RD_KAFKA_EVENT_CREATEACLS_RESULT + */ +RD_EXPORT const rd_kafka_CreateAcls_result_t * +rd_kafka_event_CreateAcls_result(rd_kafka_event_t *rkev); + +/** + * @returns the result of a DescribeAcls request, or NULL if event is of + * different type. + * + * Event types: + * RD_KAFKA_EVENT_DESCRIBEACLS_RESULT + */ +RD_EXPORT const rd_kafka_DescribeAcls_result_t * +rd_kafka_event_DescribeAcls_result(rd_kafka_event_t *rkev); + +/** + * @returns the result of a DeleteAcls request, or NULL if event is of + * different type. + * + * Event types: + * RD_KAFKA_EVENT_DELETEACLS_RESULT + */ +RD_EXPORT const rd_kafka_DeleteAcls_result_t * +rd_kafka_event_DeleteAcls_result(rd_kafka_event_t *rkev); + +/** + * @brief Get AlterConsumerGroupOffsets result. + * + * @returns the result of a AlterConsumerGroupOffsets request, or NULL if + * event is of different type. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p rkev object. + * + * Event types: + * RD_KAFKA_EVENT_ALTERCONSUMERGROUPOFFSETS_RESULT + */ +RD_EXPORT const rd_kafka_AlterConsumerGroupOffsets_result_t * +rd_kafka_event_AlterConsumerGroupOffsets_result(rd_kafka_event_t *rkev); + +/** + * @brief Get ListConsumerGroupOffsets result. + * + * @returns the result of a ListConsumerGroupOffsets request, or NULL if + * event is of different type. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p rkev object. + * + * Event types: + * RD_KAFKA_EVENT_LISTCONSUMERGROUPOFFSETS_RESULT + */ +RD_EXPORT const rd_kafka_ListConsumerGroupOffsets_result_t * +rd_kafka_event_ListConsumerGroupOffsets_result(rd_kafka_event_t *rkev); + +/** + * @brief Poll a queue for an event for max \p timeout_ms. + * + * @returns an event, or NULL. + * + * @remark Use rd_kafka_event_destroy() to free the event. + * + * @sa rd_kafka_conf_set_background_event_cb() + */ +RD_EXPORT +rd_kafka_event_t *rd_kafka_queue_poll(rd_kafka_queue_t *rkqu, int timeout_ms); + +/** + * @brief Poll a queue for events served through callbacks for max \p + * timeout_ms. + * + * @returns the number of events served. + * + * @remark This API must only be used for queues with callbacks registered + * for all expected event types. E.g., not a message queue. + * + * @remark Also see rd_kafka_conf_set_background_event_cb() for triggering + * event callbacks from a librdkafka-managed background thread. + * + * @sa rd_kafka_conf_set_background_event_cb() + */ +RD_EXPORT +int rd_kafka_queue_poll_callback(rd_kafka_queue_t *rkqu, int timeout_ms); + + +/**@}*/ + + +/** + * @name Plugin interface + * + * @brief A plugin interface that allows external runtime-loaded libraries + * to integrate with a client instance without modifications to + * the application code. + * + * Plugins are loaded when referenced through the `plugin.library.paths` + * configuration property and operates on the \c rd_kafka_conf_t + * object prior \c rd_kafka_t instance creation. + * + * @warning Plugins require the application to link librdkafka dynamically + * and not statically. Failure to do so will lead to missing symbols + * or finding symbols in another librdkafka library than the + * application was linked with. + * @{ + */ + + +/** + * @brief Plugin's configuration initializer method called each time the + * library is referenced from configuration (even if previously loaded by + * another client instance). + * + * @remark This method MUST be implemented by plugins and have the symbol name + * \c conf_init + * + * @param conf Configuration set up to this point. + * @param plug_opaquep Plugin can set this pointer to a per-configuration + * opaque pointer. + * @param errstr String buffer of size \p errstr_size where plugin must write + * a human readable error string in the case the initializer + * fails (returns non-zero). + * @param errstr_size Maximum space (including \0) in \p errstr. + * + * @remark A plugin may add an on_conf_destroy() interceptor to clean up + * plugin-specific resources created in the plugin's conf_init() method. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or an error code on error. + */ +typedef rd_kafka_resp_err_t(rd_kafka_plugin_f_conf_init_t)( + rd_kafka_conf_t *conf, + void **plug_opaquep, + char *errstr, + size_t errstr_size); + +/**@}*/ + + + +/** + * @name Interceptors + * + * @{ + * + * @brief A callback interface that allows message interception for both + * producer and consumer data pipelines. + * + * Except for the on_new(), on_conf_set(), on_conf_dup() and on_conf_destroy() + * interceptors, interceptors are added to the + * newly created rd_kafka_t client instance. These interceptors MUST only + * be added from on_new() and MUST NOT be added after rd_kafka_new() returns. + * + * The on_new(), on_conf_set(), on_conf_dup() and on_conf_destroy() interceptors + * are added to the configuration object which is later passed to + * rd_kafka_new() where on_new() is called to allow addition of + * other interceptors. + * + * Each interceptor reference consists of a display name (ic_name), + * a callback function, and an application-specified opaque value that is + * passed as-is to the callback. + * The ic_name must be unique for the interceptor implementation and is used + * to reject duplicate interceptor methods. + * + * Any number of interceptors can be added and they are called in the order + * they were added, unless otherwise noted. + * The list of registered interceptor methods are referred to as + * interceptor chains. + * + * @remark Contrary to the Java client the librdkafka interceptor interface + * does not support message key and value modification. + * Message mutability is discouraged in the Java client and the + * combination of serializers and headers cover most use-cases. + * + * @remark Interceptors are NOT copied to the new configuration on + * rd_kafka_conf_dup() since it would be hard for interceptors to + * track usage of the interceptor's opaque value. + * An interceptor should rely on the plugin, which will be copied + * in rd_kafka_conf_conf_dup(), to set up the initial interceptors. + * An interceptor should implement the on_conf_dup() method + * to manually set up its internal configuration on the newly created + * configuration object that is being copied-to based on the + * interceptor-specific configuration properties. + * conf_dup() should thus be treated the same as conf_init(). + * + * @remark Interceptors are keyed by the interceptor type (on_..()), the + * interceptor name (ic_name) and the interceptor method function. + * Duplicates are not allowed and the .._add_on_..() method will + * return RD_KAFKA_RESP_ERR__CONFLICT if attempting to add a duplicate + * method. + * The only exception is on_conf_destroy() which may be added multiple + * times by the same interceptor to allow proper cleanup of + * interceptor configuration state. + */ + + +/** + * @brief on_conf_set() is called from rd_kafka_*_conf_set() in the order + * the interceptors were added. + * + * @param conf Configuration object. + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + * @param name The configuration property to set. + * @param val The configuration value to set, or NULL for reverting to default + * in which case the previous value should be freed. + * @param errstr A human readable error string in case the interceptor fails. + * @param errstr_size Maximum space (including \0) in \p errstr. + * + * @returns RD_KAFKA_CONF_OK if the property was known and successfully + * handled by the interceptor, RD_KAFKA_CONF_INVALID if the + * property was handled by the interceptor but the value was invalid, + * or RD_KAFKA_CONF_UNKNOWN if the interceptor did not handle + * this property, in which case the property is passed on on the + * interceptor in the chain, finally ending up at the built-in + * configuration handler. + */ +typedef rd_kafka_conf_res_t(rd_kafka_interceptor_f_on_conf_set_t)( + rd_kafka_conf_t *conf, + const char *name, + const char *val, + char *errstr, + size_t errstr_size, + void *ic_opaque); + + +/** + * @brief on_conf_dup() is called from rd_kafka_conf_dup() in the + * order the interceptors were added and is used to let + * an interceptor re-register its conf interecptors with a new + * opaque value. + * The on_conf_dup() method is called prior to the configuration from + * \p old_conf being copied to \p new_conf. + * + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + * @param new_conf New configuration object. + * @param old_conf Old configuration object to copy properties from. + * @param filter_cnt Number of property names to filter in \p filter. + * @param filter Property names to filter out (ignore) when setting up + * \p new_conf. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or an error code + * on failure (which is logged but otherwise ignored). + * + * @remark No on_conf_* interceptors are copied to the new configuration + * object on rd_kafka_conf_dup(). + */ +typedef rd_kafka_resp_err_t(rd_kafka_interceptor_f_on_conf_dup_t)( + rd_kafka_conf_t *new_conf, + const rd_kafka_conf_t *old_conf, + size_t filter_cnt, + const char **filter, + void *ic_opaque); + + +/** + * @brief on_conf_destroy() is called from rd_kafka_*_conf_destroy() in the + * order the interceptors were added. + * + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + */ +typedef rd_kafka_resp_err_t(rd_kafka_interceptor_f_on_conf_destroy_t)( + void *ic_opaque); + + +/** + * @brief on_new() is called from rd_kafka_new() prior toreturning + * the newly created client instance to the application. + * + * @param rk The client instance. + * @param conf The client instance's final configuration. + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + * @param errstr A human readable error string in case the interceptor fails. + * @param errstr_size Maximum space (including \0) in \p errstr. + * + * @returns an error code on failure, the error is logged but otherwise ignored. + * + * @warning The \p rk client instance will not be fully set up when this + * interceptor is called and the interceptor MUST NOT call any + * other rk-specific APIs than rd_kafka_interceptor_add..(). + * + */ +typedef rd_kafka_resp_err_t(rd_kafka_interceptor_f_on_new_t)( + rd_kafka_t *rk, + const rd_kafka_conf_t *conf, + void *ic_opaque, + char *errstr, + size_t errstr_size); + + +/** + * @brief on_destroy() is called from rd_kafka_destroy() or (rd_kafka_new() + * if rd_kafka_new() fails during initialization). + * + * @param rk The client instance. + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + */ +typedef rd_kafka_resp_err_t( + rd_kafka_interceptor_f_on_destroy_t)(rd_kafka_t *rk, void *ic_opaque); + + + +/** + * @brief on_send() is called from rd_kafka_produce*() (et.al) prior to + * the partitioner being called. + * + * @param rk The client instance. + * @param rkmessage The message being produced. Immutable. + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + * + * @remark This interceptor is only used by producer instances. + * + * @remark The \p rkmessage object is NOT mutable and MUST NOT be modified + * by the interceptor. + * + * @remark If the partitioner fails or an unknown partition was specified, + * the on_acknowledgement() interceptor chain will be called from + * within the rd_kafka_produce*() call to maintain send-acknowledgement + * symmetry. + * + * @returns an error code on failure, the error is logged but otherwise ignored. + */ +typedef rd_kafka_resp_err_t(rd_kafka_interceptor_f_on_send_t)( + rd_kafka_t *rk, + rd_kafka_message_t *rkmessage, + void *ic_opaque); + +/** + * @brief on_acknowledgement() is called to inform interceptors that a message + * was succesfully delivered or permanently failed delivery. + * The interceptor chain is called from internal librdkafka background + * threads, or rd_kafka_produce*() if the partitioner failed. + * + * @param rk The client instance. + * @param rkmessage The message being produced. Immutable. + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + * + * @remark This interceptor is only used by producer instances. + * + * @remark The \p rkmessage object is NOT mutable and MUST NOT be modified + * by the interceptor. + * + * @warning The on_acknowledgement() method may be called from internal + * librdkafka threads. An on_acknowledgement() interceptor MUST NOT + * call any librdkafka API's associated with the \p rk, or perform + * any blocking or prolonged work. + * + * @returns an error code on failure, the error is logged but otherwise ignored. + */ +typedef rd_kafka_resp_err_t(rd_kafka_interceptor_f_on_acknowledgement_t)( + rd_kafka_t *rk, + rd_kafka_message_t *rkmessage, + void *ic_opaque); + + +/** + * @brief on_consume() is called just prior to passing the message to the + * application in rd_kafka_consumer_poll(), rd_kafka_consume*(), + * the event interface, etc. + * + * @param rk The client instance. + * @param rkmessage The message being consumed. Immutable. + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + * + * @remark This interceptor is only used by consumer instances. + * + * @remark The \p rkmessage object is NOT mutable and MUST NOT be modified + * by the interceptor. + * + * @returns an error code on failure, the error is logged but otherwise ignored. + */ +typedef rd_kafka_resp_err_t(rd_kafka_interceptor_f_on_consume_t)( + rd_kafka_t *rk, + rd_kafka_message_t *rkmessage, + void *ic_opaque); + +/** + * @brief on_commit() is called on completed or failed offset commit. + * It is called from internal librdkafka threads. + * + * @param rk The client instance. + * @param offsets List of topic+partition+offset+error that were committed. + * The error message of each partition should be checked for + * error. + * @param err The commit error, if any. + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + * + * @remark This interceptor is only used by consumer instances. + * + * @warning The on_commit() interceptor is called from internal + * librdkafka threads. An on_commit() interceptor MUST NOT + * call any librdkafka API's associated with the \p rk, or perform + * any blocking or prolonged work. + * + * + * @returns an error code on failure, the error is logged but otherwise ignored. + */ +typedef rd_kafka_resp_err_t(rd_kafka_interceptor_f_on_commit_t)( + rd_kafka_t *rk, + const rd_kafka_topic_partition_list_t *offsets, + rd_kafka_resp_err_t err, + void *ic_opaque); + + +/** + * @brief on_request_sent() is called when a request has been fully written + * to a broker TCP connections socket. + * + * @param rk The client instance. + * @param sockfd Socket file descriptor. + * @param brokername Broker request is being sent to. + * @param brokerid Broker request is being sent to. + * @param ApiKey Kafka protocol request type. + * @param ApiVersion Kafka protocol request type version. + * @param CorrId Kafka protocol request correlation id. + * @param size Size of request. + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + * + * @warning The on_request_sent() interceptor is called from internal + * librdkafka broker threads. An on_request_sent() interceptor MUST NOT + * call any librdkafka API's associated with the \p rk, or perform + * any blocking or prolonged work. + * + * @returns an error code on failure, the error is logged but otherwise ignored. + */ +typedef rd_kafka_resp_err_t(rd_kafka_interceptor_f_on_request_sent_t)( + rd_kafka_t *rk, + int sockfd, + const char *brokername, + int32_t brokerid, + int16_t ApiKey, + int16_t ApiVersion, + int32_t CorrId, + size_t size, + void *ic_opaque); + + +/** + * @brief on_response_received() is called when a protocol response has been + * fully received from a broker TCP connection socket but before the + * response payload is parsed. + * + * @param rk The client instance. + * @param sockfd Socket file descriptor (always -1). + * @param brokername Broker response was received from, possibly empty string + * on error. + * @param brokerid Broker response was received from. + * @param ApiKey Kafka protocol request type or -1 on error. + * @param ApiVersion Kafka protocol request type version or -1 on error. + * @param CorrId Kafka protocol request correlation id, possibly -1 on error. + * @param size Size of response, possibly 0 on error. + * @param rtt Request round-trip-time in microseconds, possibly -1 on error. + * @param err Receive error. + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + * + * @warning The on_response_received() interceptor is called from internal + * librdkafka broker threads. An on_response_received() interceptor + * MUST NOT call any librdkafka API's associated with the \p rk, or + * perform any blocking or prolonged work. + * + * @returns an error code on failure, the error is logged but otherwise ignored. + */ +typedef rd_kafka_resp_err_t(rd_kafka_interceptor_f_on_response_received_t)( + rd_kafka_t *rk, + int sockfd, + const char *brokername, + int32_t brokerid, + int16_t ApiKey, + int16_t ApiVersion, + int32_t CorrId, + size_t size, + int64_t rtt, + rd_kafka_resp_err_t err, + void *ic_opaque); + + +/** + * @brief on_thread_start() is called from a newly created librdkafka-managed + * thread. + + * @param rk The client instance. + * @param thread_type Thread type. + * @param thread_name Human-readable thread name, may not be unique. + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + * + * @warning The on_thread_start() interceptor is called from internal + * librdkafka threads. An on_thread_start() interceptor MUST NOT + * call any librdkafka API's associated with the \p rk, or perform + * any blocking or prolonged work. + * + * @returns an error code on failure, the error is logged but otherwise ignored. + */ +typedef rd_kafka_resp_err_t(rd_kafka_interceptor_f_on_thread_start_t)( + rd_kafka_t *rk, + rd_kafka_thread_type_t thread_type, + const char *thread_name, + void *ic_opaque); + + +/** + * @brief on_thread_exit() is called just prior to a librdkafka-managed + * thread exiting from the exiting thread itself. + * + * @param rk The client instance. + * @param thread_type Thread type.n + * @param thread_name Human-readable thread name, may not be unique. + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + * + * @remark Depending on the thread type, librdkafka may execute additional + * code on the thread after on_thread_exit() returns. + * + * @warning The on_thread_exit() interceptor is called from internal + * librdkafka threads. An on_thread_exit() interceptor MUST NOT + * call any librdkafka API's associated with the \p rk, or perform + * any blocking or prolonged work. + * + * @returns an error code on failure, the error is logged but otherwise ignored. + */ +typedef rd_kafka_resp_err_t(rd_kafka_interceptor_f_on_thread_exit_t)( + rd_kafka_t *rk, + rd_kafka_thread_type_t thread_type, + const char *thread_name, + void *ic_opaque); + + +/** + * @brief on_broker_state_change() is called just after a broker + * has been created or its state has been changed. + * + * @param rk The client instance. + * @param broker_id The broker id (-1 is used for bootstrap brokers). + * @param secproto The security protocol. + * @param name The original name of the broker. + * @param port The port of the broker. + * @param state Broker state name. + * @param ic_opaque The interceptor's opaque pointer specified in ..add..(). + * + * @returns an error code on failure, the error is logged but otherwise ignored. + */ +typedef rd_kafka_resp_err_t(rd_kafka_interceptor_f_on_broker_state_change_t)( + rd_kafka_t *rk, + int32_t broker_id, + const char *secproto, + const char *name, + int port, + const char *state, + void *ic_opaque); + + +/** + * @brief Append an on_conf_set() interceptor. + * + * @param conf Configuration object. + * @param ic_name Interceptor name, used in logging. + * @param on_conf_set Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing interceptor with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_conf_interceptor_add_on_conf_set( + rd_kafka_conf_t *conf, + const char *ic_name, + rd_kafka_interceptor_f_on_conf_set_t *on_conf_set, + void *ic_opaque); + + +/** + * @brief Append an on_conf_dup() interceptor. + * + * @param conf Configuration object. + * @param ic_name Interceptor name, used in logging. + * @param on_conf_dup Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing interceptor with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_conf_interceptor_add_on_conf_dup( + rd_kafka_conf_t *conf, + const char *ic_name, + rd_kafka_interceptor_f_on_conf_dup_t *on_conf_dup, + void *ic_opaque); + +/** + * @brief Append an on_conf_destroy() interceptor. + * + * @param conf Configuration object. + * @param ic_name Interceptor name, used in logging. + * @param on_conf_destroy Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR + * + * @remark Multiple on_conf_destroy() interceptors are allowed to be added + * to the same configuration object. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_conf_interceptor_add_on_conf_destroy( + rd_kafka_conf_t *conf, + const char *ic_name, + rd_kafka_interceptor_f_on_conf_destroy_t *on_conf_destroy, + void *ic_opaque); + + +/** + * @brief Append an on_new() interceptor. + * + * @param conf Configuration object. + * @param ic_name Interceptor name, used in logging. + * @param on_new Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @remark Since the on_new() interceptor is added to the configuration object + * it may be copied by rd_kafka_conf_dup(). + * An interceptor implementation must thus be able to handle + * the same interceptor,ic_opaque tuple to be used by multiple + * client instances. + * + * @remark An interceptor plugin should check the return value to make sure it + * has not already been added. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing interceptor with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_conf_interceptor_add_on_new(rd_kafka_conf_t *conf, + const char *ic_name, + rd_kafka_interceptor_f_on_new_t *on_new, + void *ic_opaque); + + + +/** + * @brief Append an on_destroy() interceptor. + * + * @param rk Client instance. + * @param ic_name Interceptor name, used in logging. + * @param on_destroy Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing interceptor with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_interceptor_add_on_destroy( + rd_kafka_t *rk, + const char *ic_name, + rd_kafka_interceptor_f_on_destroy_t *on_destroy, + void *ic_opaque); + + +/** + * @brief Append an on_send() interceptor. + * + * @param rk Client instance. + * @param ic_name Interceptor name, used in logging. + * @param on_send Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing intercepted with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_interceptor_add_on_send(rd_kafka_t *rk, + const char *ic_name, + rd_kafka_interceptor_f_on_send_t *on_send, + void *ic_opaque); + +/** + * @brief Append an on_acknowledgement() interceptor. + * + * @param rk Client instance. + * @param ic_name Interceptor name, used in logging. + * @param on_acknowledgement Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing interceptor with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_interceptor_add_on_acknowledgement( + rd_kafka_t *rk, + const char *ic_name, + rd_kafka_interceptor_f_on_acknowledgement_t *on_acknowledgement, + void *ic_opaque); + + +/** + * @brief Append an on_consume() interceptor. + * + * @param rk Client instance. + * @param ic_name Interceptor name, used in logging. + * @param on_consume Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing interceptor with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_interceptor_add_on_consume( + rd_kafka_t *rk, + const char *ic_name, + rd_kafka_interceptor_f_on_consume_t *on_consume, + void *ic_opaque); + + +/** + * @brief Append an on_commit() interceptor. + * + * @param rk Client instance. + * @param ic_name Interceptor name, used in logging. + * @param on_commit() Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing interceptor with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_interceptor_add_on_commit( + rd_kafka_t *rk, + const char *ic_name, + rd_kafka_interceptor_f_on_commit_t *on_commit, + void *ic_opaque); + + +/** + * @brief Append an on_request_sent() interceptor. + * + * @param rk Client instance. + * @param ic_name Interceptor name, used in logging. + * @param on_request_sent() Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing interceptor with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_interceptor_add_on_request_sent( + rd_kafka_t *rk, + const char *ic_name, + rd_kafka_interceptor_f_on_request_sent_t *on_request_sent, + void *ic_opaque); + + +/** + * @brief Append an on_response_received() interceptor. + * + * @param rk Client instance. + * @param ic_name Interceptor name, used in logging. + * @param on_response_received() Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing interceptor with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_interceptor_add_on_response_received( + rd_kafka_t *rk, + const char *ic_name, + rd_kafka_interceptor_f_on_response_received_t *on_response_received, + void *ic_opaque); + + +/** + * @brief Append an on_thread_start() interceptor. + * + * @param rk Client instance. + * @param ic_name Interceptor name, used in logging. + * @param on_thread_start() Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing interceptor with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_interceptor_add_on_thread_start( + rd_kafka_t *rk, + const char *ic_name, + rd_kafka_interceptor_f_on_thread_start_t *on_thread_start, + void *ic_opaque); + + +/** + * @brief Append an on_thread_exit() interceptor. + * + * @param rk Client instance. + * @param ic_name Interceptor name, used in logging. + * @param on_thread_exit() Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing interceptor with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_interceptor_add_on_thread_exit( + rd_kafka_t *rk, + const char *ic_name, + rd_kafka_interceptor_f_on_thread_exit_t *on_thread_exit, + void *ic_opaque); + + +/** + * @brief Append an on_broker_state_change() interceptor. + * + * @param rk Client instance. + * @param ic_name Interceptor name, used in logging. + * @param on_broker_state_change() Function pointer. + * @param ic_opaque Opaque value that will be passed to the function. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or RD_KAFKA_RESP_ERR__CONFLICT + * if an existing interceptor with the same \p ic_name and function + * has already been added to \p conf. + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_interceptor_add_on_broker_state_change( + rd_kafka_t *rk, + const char *ic_name, + rd_kafka_interceptor_f_on_broker_state_change_t *on_broker_state_change, + void *ic_opaque); + + + +/**@}*/ + + + +/** + * @name Auxiliary types + * + * @{ + */ + + + +/** + * @brief Topic result provides per-topic operation result information. + * + */ + +/** + * @returns the error code for the given topic result. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_topic_result_error(const rd_kafka_topic_result_t *topicres); + +/** + * @returns the human readable error string for the given topic result, + * or NULL if there was no error. + * + * @remark lifetime of the returned string is the same as the \p topicres. + */ +RD_EXPORT const char * +rd_kafka_topic_result_error_string(const rd_kafka_topic_result_t *topicres); + +/** + * @returns the name of the topic for the given topic result. + * @remark lifetime of the returned string is the same as the \p topicres. + * + */ +RD_EXPORT const char * +rd_kafka_topic_result_name(const rd_kafka_topic_result_t *topicres); + +/** + * @brief Group result provides per-group operation result information. + * + */ + +/** + * @returns the error for the given group result, or NULL on success. + * @remark lifetime of the returned error is the same as the \p groupres. + */ +RD_EXPORT const rd_kafka_error_t * +rd_kafka_group_result_error(const rd_kafka_group_result_t *groupres); + +/** + * @returns the name of the group for the given group result. + * @remark lifetime of the returned string is the same as the \p groupres. + * + */ +RD_EXPORT const char * +rd_kafka_group_result_name(const rd_kafka_group_result_t *groupres); + +/** + * @returns the partitions/offsets for the given group result, if applicable + * to the request type, else NULL. + * @remark lifetime of the returned list is the same as the \p groupres. + */ +RD_EXPORT const rd_kafka_topic_partition_list_t * +rd_kafka_group_result_partitions(const rd_kafka_group_result_t *groupres); + + +/**@}*/ + + +/** + * @name Admin API + * @{ + * + * @brief The Admin API enables applications to perform administrative + * Apache Kafka tasks, such as creating and deleting topics, + * altering and reading broker configuration, etc. + * + * The Admin API is asynchronous and makes use of librdkafka's standard + * \c rd_kafka_queue_t queues to propagate the result of an admin operation + * back to the application. + * The supplied queue may be any queue, such as a temporary single-call queue, + * a shared queue used for multiple requests, or even the main queue or + * consumer queues. + * + * Use \c rd_kafka_queue_poll() to collect the result of an admin operation + * from the queue of your choice, then extract the admin API-specific result + * type by using the corresponding \c rd_kafka_event_CreateTopics_result, + * \c rd_kafka_event_DescribeConfigs_result, etc, methods. + * Use the getter methods on the \c .._result_t type to extract response + * information and finally destroy the result and event by calling + * \c rd_kafka_event_destroy(). + * + * Use rd_kafka_event_error() and rd_kafka_event_error_string() to acquire + * the request-level error/success for an Admin API request. + * Even if the returned value is \c RD_KAFKA_RESP_ERR_NO_ERROR there + * may be individual objects (topics, resources, etc) that have failed. + * Extract per-object error information with the corresponding + * \c rd_kafka_..._result_topics|resources|..() to check per-object errors. + * + * Locally triggered errors: + * - \c RD_KAFKA_RESP_ERR__TIMED_OUT - (Controller) broker connection did not + * become available in the time allowed by AdminOption_set_request_timeout. + */ + + +/** + * @enum rd_kafka_admin_op_t + * + * @brief Admin operation enum name for use with rd_kafka_AdminOptions_new() + * + * @sa rd_kafka_AdminOptions_new() + */ +typedef enum rd_kafka_admin_op_t { + RD_KAFKA_ADMIN_OP_ANY = 0, /**< Default value */ + RD_KAFKA_ADMIN_OP_CREATETOPICS, /**< CreateTopics */ + RD_KAFKA_ADMIN_OP_DELETETOPICS, /**< DeleteTopics */ + RD_KAFKA_ADMIN_OP_CREATEPARTITIONS, /**< CreatePartitions */ + RD_KAFKA_ADMIN_OP_ALTERCONFIGS, /**< AlterConfigs */ + RD_KAFKA_ADMIN_OP_DESCRIBECONFIGS, /**< DescribeConfigs */ + RD_KAFKA_ADMIN_OP_DELETERECORDS, /**< DeleteRecords */ + RD_KAFKA_ADMIN_OP_DELETEGROUPS, /**< DeleteGroups */ + /** DeleteConsumerGroupOffsets */ + RD_KAFKA_ADMIN_OP_DELETECONSUMERGROUPOFFSETS, + RD_KAFKA_ADMIN_OP_CREATEACLS, /**< CreateAcls */ + RD_KAFKA_ADMIN_OP_DESCRIBEACLS, /**< DescribeAcls */ + RD_KAFKA_ADMIN_OP_DELETEACLS, /**< DeleteAcls */ + RD_KAFKA_ADMIN_OP_LISTCONSUMERGROUPS, /**< ListConsumerGroups */ + RD_KAFKA_ADMIN_OP_DESCRIBECONSUMERGROUPS, /**< DescribeConsumerGroups */ + /** ListConsumerGroupOffsets */ + RD_KAFKA_ADMIN_OP_LISTCONSUMERGROUPOFFSETS, + /** AlterConsumerGroupOffsets */ + RD_KAFKA_ADMIN_OP_ALTERCONSUMERGROUPOFFSETS, + RD_KAFKA_ADMIN_OP__CNT /**< Number of ops defined */ +} rd_kafka_admin_op_t; + +/** + * @brief AdminOptions provides a generic mechanism for setting optional + * parameters for the Admin API requests. + * + * @remark Since AdminOptions is decoupled from the actual request type + * there is no enforcement to prevent setting unrelated properties, + * e.g. setting validate_only on a DescribeConfigs request is allowed + * but is silently ignored by DescribeConfigs. + * Future versions may introduce such enforcement. + */ + + +typedef struct rd_kafka_AdminOptions_s rd_kafka_AdminOptions_t; + +/** + * @brief Create a new AdminOptions object. + * + * The options object is not modified by the Admin API request APIs, + * (e.g. CreateTopics) and may be reused for multiple calls. + * + * @param rk Client instance. + * @param for_api Specifies what Admin API this AdminOptions object will be used + * for, which will enforce what AdminOptions_set_..() calls may + * be used based on the API, causing unsupported set..() calls + * to fail. + * Specifying RD_KAFKA_ADMIN_OP_ANY disables the enforcement + * allowing any option to be set, even if the option + * is not used in a future call to an Admin API method. + * + * @returns a new AdminOptions object (which must be freed with + * rd_kafka_AdminOptions_destroy()), or NULL if \p for_api was set to + * an unknown API op type. + */ +RD_EXPORT rd_kafka_AdminOptions_t * +rd_kafka_AdminOptions_new(rd_kafka_t *rk, rd_kafka_admin_op_t for_api); + + +/** + * @brief Destroy a AdminOptions object. + */ +RD_EXPORT void rd_kafka_AdminOptions_destroy(rd_kafka_AdminOptions_t *options); + + +/** + * @brief Sets the overall request timeout, including broker lookup, + * request transmission, operation time on broker, and response. + * + * @param options Admin options. + * @param timeout_ms Timeout in milliseconds, use -1 for indefinite timeout. + * Defaults to `socket.timeout.ms`. + * @param errstr A human readable error string (nul-terminated) is written to + * this location that must be of at least \p errstr_size bytes. + * The \p errstr is only written in case of error. + * @param errstr_size Writable size in \p errstr. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success, or + * RD_KAFKA_RESP_ERR__INVALID_ARG if timeout was out of range in which + * case an error string will be written \p errstr. + * + * @remark This option is valid for all Admin API requests. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_AdminOptions_set_request_timeout(rd_kafka_AdminOptions_t *options, + int timeout_ms, + char *errstr, + size_t errstr_size); + + +/** + * @brief Sets the broker's operation timeout, such as the timeout for + * CreateTopics to complete the creation of topics on the controller + * before returning a result to the application. + * + * CreateTopics: values <= 0 will return immediately after triggering topic + * creation, while > 0 will wait this long for topic creation to propagate + * in cluster. Default: 60 seconds. + * + * DeleteTopics: same semantics as CreateTopics. + * CreatePartitions: same semantics as CreateTopics. + * + * @param options Admin options. + * @param timeout_ms Timeout in milliseconds. + * @param errstr A human readable error string (nul-terminated) is written to + * this location that must be of at least \p errstr_size bytes. + * The \p errstr is only written in case of error. + * @param errstr_size Writable size in \p errstr. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success, or + * RD_KAFKA_RESP_ERR__INVALID_ARG if timeout was out of range in which + * case an error string will be written \p errstr. + * + * @remark This option is valid for CreateTopics, DeleteTopics, + * CreatePartitions, and DeleteRecords. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_AdminOptions_set_operation_timeout(rd_kafka_AdminOptions_t *options, + int timeout_ms, + char *errstr, + size_t errstr_size); + + +/** + * @brief Tell broker to only validate the request, without performing + * the requested operation (create topics, etc). + * + * @param options Admin options. + * @param true_or_false Defaults to false. + * @param errstr A human readable error string (nul-terminated) is written to + * this location that must be of at least \p errstr_size bytes. + * The \p errstr is only written in case of error. + * @param errstr_size Writable size in \p errstr. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or an + * error code on failure in which case an error string will + * be written \p errstr. + * + * @remark This option is valid for CreateTopics, + * CreatePartitions, AlterConfigs. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_AdminOptions_set_validate_only(rd_kafka_AdminOptions_t *options, + int true_or_false, + char *errstr, + size_t errstr_size); + + +/** + * @brief Override what broker the Admin request will be sent to. + * + * By default, Admin requests are sent to the controller broker, with + * the following exceptions: + * - AlterConfigs with a BROKER resource are sent to the broker id set + * as the resource name. + * - DescribeConfigs with a BROKER resource are sent to the broker id set + * as the resource name. + * + * @param options Admin Options. + * @param broker_id The broker to send the request to. + * @param errstr A human readable error string (nul-terminated) is written to + * this location that must be of at least \p errstr_size bytes. + * The \p errstr is only written in case of error. + * @param errstr_size Writable size in \p errstr. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success or an + * error code on failure in which case an error string will + * be written \p errstr. + * + * @remark This API should typically not be used, but serves as a workaround + * if new resource types are to the broker that the client + * does not know where to send. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_AdminOptions_set_broker(rd_kafka_AdminOptions_t *options, + int32_t broker_id, + char *errstr, + size_t errstr_size); + + +/** + * @brief Whether broker should return stable offsets + * (transaction-committed). + * + * @param options Admin options. + * @param true_or_false Defaults to false. + * + * @return NULL on success, a new error instance that must be + * released with rd_kafka_error_destroy() in case of error. + * + * @remark This option is valid for ListConsumerGroupOffsets. + */ +RD_EXPORT +rd_kafka_error_t *rd_kafka_AdminOptions_set_require_stable_offsets( + rd_kafka_AdminOptions_t *options, + int true_or_false); + +/** + * @brief Set consumer groups states to query for. + * + * @param options Admin options. + * @param consumer_group_states Array of consumer group states. + * @param consumer_group_states_cnt Size of the \p consumer_group_states array. + * + * @return NULL on success, a new error instance that must be + * released with rd_kafka_error_destroy() in case of error. + * + * @remark This option is valid for ListConsumerGroups. + */ +RD_EXPORT +rd_kafka_error_t *rd_kafka_AdminOptions_set_match_consumer_group_states( + rd_kafka_AdminOptions_t *options, + const rd_kafka_consumer_group_state_t *consumer_group_states, + size_t consumer_group_states_cnt); + +/** + * @brief Set application opaque value that can be extracted from the + * result event using rd_kafka_event_opaque() + */ +RD_EXPORT void +rd_kafka_AdminOptions_set_opaque(rd_kafka_AdminOptions_t *options, + void *ev_opaque); + +/**@}*/ + +/** + * @name Admin API - Topics + * @brief Topic related operations. + * @{ + * + */ + + +/*! Defines a new topic to be created. */ +typedef struct rd_kafka_NewTopic_s rd_kafka_NewTopic_t; + +/** + * @brief Create a new NewTopic object. This object is later passed to + * rd_kafka_CreateTopics(). + * + * @param topic Topic name to create. + * @param num_partitions Number of partitions in topic, or -1 to use the + * broker's default partition count (>= 2.4.0). + * @param replication_factor Default replication factor for the topic's + * partitions, or -1 to use the broker's default + * replication factor (>= 2.4.0) or if + * set_replica_assignment() will be used. + * @param errstr A human readable error string (nul-terminated) is written to + * this location that must be of at least \p errstr_size bytes. + * The \p errstr is only written in case of error. + * @param errstr_size Writable size in \p errstr. + * + * + * @returns a new allocated NewTopic object, or NULL if the input parameters + * are invalid. + * Use rd_kafka_NewTopic_destroy() to free object when done. + */ +RD_EXPORT rd_kafka_NewTopic_t *rd_kafka_NewTopic_new(const char *topic, + int num_partitions, + int replication_factor, + char *errstr, + size_t errstr_size); + +/** + * @brief Destroy and free a NewTopic object previously created with + * rd_kafka_NewTopic_new() + */ +RD_EXPORT void rd_kafka_NewTopic_destroy(rd_kafka_NewTopic_t *new_topic); + + +/** + * @brief Helper function to destroy all NewTopic objects in the \p new_topics + * array (of \p new_topic_cnt elements). + * The array itself is not freed. + */ +RD_EXPORT void rd_kafka_NewTopic_destroy_array(rd_kafka_NewTopic_t **new_topics, + size_t new_topic_cnt); + + +/** + * @brief Set the replica (broker) assignment for \p partition to the + * replica set in \p broker_ids (of \p broker_id_cnt elements). + * + * @remark When this method is used, rd_kafka_NewTopic_new() must have + * been called with a \c replication_factor of -1. + * + * @remark An application must either set the replica assignment for + * all new partitions, or none. + * + * @remark If called, this function must be called consecutively for each + * partition, starting at 0. + * + * @remark Use rd_kafka_metadata() to retrieve the list of brokers + * in the cluster. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success, or an error code + * if the arguments were invalid. + * + * @sa rd_kafka_AdminOptions_set_validate_only() + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_NewTopic_set_replica_assignment(rd_kafka_NewTopic_t *new_topic, + int32_t partition, + int32_t *broker_ids, + size_t broker_id_cnt, + char *errstr, + size_t errstr_size); + +/** + * @brief Set (broker-side) topic configuration name/value pair. + * + * @remark The name and value are not validated by the client, the validation + * takes place on the broker. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success, or an error code + * if the arguments were invalid. + * + * @sa rd_kafka_AdminOptions_set_validate_only() + * @sa http://kafka.apache.org/documentation.html#topicconfigs + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_NewTopic_set_config(rd_kafka_NewTopic_t *new_topic, + const char *name, + const char *value); + + +/** + * @brief Create topics in cluster as specified by the \p new_topics + * array of size \p new_topic_cnt elements. + * + * @param rk Client instance. + * @param new_topics Array of new topics to create. + * @param new_topic_cnt Number of elements in \p new_topics array. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * Supported admin options: + * - rd_kafka_AdminOptions_set_validate_only() - default false + * - rd_kafka_AdminOptions_set_operation_timeout() - default 60 seconds + * - rd_kafka_AdminOptions_set_request_timeout() - default socket.timeout.ms + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_CREATETOPICS_RESULT + */ +RD_EXPORT void rd_kafka_CreateTopics(rd_kafka_t *rk, + rd_kafka_NewTopic_t **new_topics, + size_t new_topic_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + + +/* + * CreateTopics result type and methods + */ + +/** + * @brief Get an array of topic results from a CreateTopics result. + * + * The returned \p topics life-time is the same as the \p result object. + * + * @param result Result to get topics from. + * @param cntp Updated to the number of elements in the array. + */ +RD_EXPORT const rd_kafka_topic_result_t **rd_kafka_CreateTopics_result_topics( + const rd_kafka_CreateTopics_result_t *result, + size_t *cntp); + + + +/* + * DeleteTopics - delete topics from cluster + * + */ + +/*! Represents a topic to be deleted. */ +typedef struct rd_kafka_DeleteTopic_s rd_kafka_DeleteTopic_t; + +/** + * @brief Create a new DeleteTopic object. This object is later passed to + * rd_kafka_DeleteTopics(). + * + * @param topic Topic name to delete. + * + * @returns a new allocated DeleteTopic object. + * Use rd_kafka_DeleteTopic_destroy() to free object when done. + */ +RD_EXPORT rd_kafka_DeleteTopic_t *rd_kafka_DeleteTopic_new(const char *topic); + +/** + * @brief Destroy and free a DeleteTopic object previously created with + * rd_kafka_DeleteTopic_new() + */ +RD_EXPORT void rd_kafka_DeleteTopic_destroy(rd_kafka_DeleteTopic_t *del_topic); + +/** + * @brief Helper function to destroy all DeleteTopic objects in + * the \p del_topics array (of \p del_topic_cnt elements). + * The array itself is not freed. + */ +RD_EXPORT void +rd_kafka_DeleteTopic_destroy_array(rd_kafka_DeleteTopic_t **del_topics, + size_t del_topic_cnt); + +/** + * @brief Delete topics from cluster as specified by the \p topics + * array of size \p topic_cnt elements. + * + * @param rk Client instance. + * @param del_topics Array of topics to delete. + * @param del_topic_cnt Number of elements in \p topics array. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_DELETETOPICS_RESULT + */ +RD_EXPORT +void rd_kafka_DeleteTopics(rd_kafka_t *rk, + rd_kafka_DeleteTopic_t **del_topics, + size_t del_topic_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + + + +/* + * DeleteTopics result type and methods + */ + +/** + * @brief Get an array of topic results from a DeleteTopics result. + * + * The returned \p topics life-time is the same as the \p result object. + * + * @param result Result to get topic results from. + * @param cntp is updated to the number of elements in the array. + */ +RD_EXPORT const rd_kafka_topic_result_t **rd_kafka_DeleteTopics_result_topics( + const rd_kafka_DeleteTopics_result_t *result, + size_t *cntp); + + +/**@}*/ + +/** + * @name Admin API - Partitions + * @brief Partition related operations. + * @{ + * + */ + +/*! Defines a new partition to be created. */ +typedef struct rd_kafka_NewPartitions_s rd_kafka_NewPartitions_t; + +/** + * @brief Create a new NewPartitions. This object is later passed to + * rd_kafka_CreatePartitions() to increase the number of partitions + * to \p new_total_cnt for an existing topic. + * + * @param topic Topic name to create more partitions for. + * @param new_total_cnt Increase the topic's partition count to this value. + * @param errstr A human readable error string (nul-terminated) is written to + * this location that must be of at least \p errstr_size bytes. + * The \p errstr is only written in case of error. + * @param errstr_size Writable size in \p errstr. + * + * @returns a new allocated NewPartitions object, or NULL if the + * input parameters are invalid. + * Use rd_kafka_NewPartitions_destroy() to free object when done. + */ +RD_EXPORT rd_kafka_NewPartitions_t * +rd_kafka_NewPartitions_new(const char *topic, + size_t new_total_cnt, + char *errstr, + size_t errstr_size); + +/** + * @brief Destroy and free a NewPartitions object previously created with + * rd_kafka_NewPartitions_new() + */ +RD_EXPORT void +rd_kafka_NewPartitions_destroy(rd_kafka_NewPartitions_t *new_parts); + +/** + * @brief Helper function to destroy all NewPartitions objects in the + * \p new_parts array (of \p new_parts_cnt elements). + * The array itself is not freed. + */ +RD_EXPORT void +rd_kafka_NewPartitions_destroy_array(rd_kafka_NewPartitions_t **new_parts, + size_t new_parts_cnt); + +/** + * @brief Set the replica (broker id) assignment for \p new_partition_idx to the + * replica set in \p broker_ids (of \p broker_id_cnt elements). + * + * @remark An application must either set the replica assignment for + * all new partitions, or none. + * + * @remark If called, this function must be called consecutively for each + * new partition being created, + * where \p new_partition_idx 0 is the first new partition, + * 1 is the second, and so on. + * + * @remark \p broker_id_cnt should match the topic's replication factor. + * + * @remark Use rd_kafka_metadata() to retrieve the list of brokers + * in the cluster. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR on success, or an error code + * if the arguments were invalid. + * + * @sa rd_kafka_AdminOptions_set_validate_only() + */ +RD_EXPORT rd_kafka_resp_err_t rd_kafka_NewPartitions_set_replica_assignment( + rd_kafka_NewPartitions_t *new_parts, + int32_t new_partition_idx, + int32_t *broker_ids, + size_t broker_id_cnt, + char *errstr, + size_t errstr_size); + + +/** + * @brief Create additional partitions for the given topics, as specified + * by the \p new_parts array of size \p new_parts_cnt elements. + * + * @param rk Client instance. + * @param new_parts Array of topics for which new partitions are to be created. + * @param new_parts_cnt Number of elements in \p new_parts array. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * Supported admin options: + * - rd_kafka_AdminOptions_set_validate_only() - default false + * - rd_kafka_AdminOptions_set_operation_timeout() - default 60 seconds + * - rd_kafka_AdminOptions_set_request_timeout() - default socket.timeout.ms + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_CREATEPARTITIONS_RESULT + */ +RD_EXPORT void rd_kafka_CreatePartitions(rd_kafka_t *rk, + rd_kafka_NewPartitions_t **new_parts, + size_t new_parts_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + + + +/* + * CreatePartitions result type and methods + */ + +/** + * @brief Get an array of topic results from a CreatePartitions result. + * + * The returned \p topics life-time is the same as the \p result object. + * + * @param result Result o get topic results from. + * @param cntp is updated to the number of elements in the array. + */ +RD_EXPORT const rd_kafka_topic_result_t ** +rd_kafka_CreatePartitions_result_topics( + const rd_kafka_CreatePartitions_result_t *result, + size_t *cntp); + +/**@}*/ + +/** + * @name Admin API - Configuration + * @brief Cluster, broker, topic configuration entries, sources, etc. + * @{ + * + */ + +/** + * @enum rd_kafka_ConfigSource_t + * + * @brief Apache Kafka config sources. + * + * @remark These entities relate to the cluster, not the local client. + * + * @sa rd_kafka_conf_set(), et.al. for local client configuration. + */ +typedef enum rd_kafka_ConfigSource_t { + /** Source unknown, e.g., in the ConfigEntry used for alter requests + * where source is not set */ + RD_KAFKA_CONFIG_SOURCE_UNKNOWN_CONFIG = 0, + /** Dynamic topic config that is configured for a specific topic */ + RD_KAFKA_CONFIG_SOURCE_DYNAMIC_TOPIC_CONFIG = 1, + /** Dynamic broker config that is configured for a specific broker */ + RD_KAFKA_CONFIG_SOURCE_DYNAMIC_BROKER_CONFIG = 2, + /** Dynamic broker config that is configured as default for all + * brokers in the cluster */ + RD_KAFKA_CONFIG_SOURCE_DYNAMIC_DEFAULT_BROKER_CONFIG = 3, + /** Static broker config provided as broker properties at startup + * (e.g. from server.properties file) */ + RD_KAFKA_CONFIG_SOURCE_STATIC_BROKER_CONFIG = 4, + /** Built-in default configuration for configs that have a + * default value */ + RD_KAFKA_CONFIG_SOURCE_DEFAULT_CONFIG = 5, + + /** Number of source types defined */ + RD_KAFKA_CONFIG_SOURCE__CNT, +} rd_kafka_ConfigSource_t; + + +/** + * @returns a string representation of the \p confsource. + */ +RD_EXPORT const char * +rd_kafka_ConfigSource_name(rd_kafka_ConfigSource_t confsource); + + +/*! Apache Kafka configuration entry. */ +typedef struct rd_kafka_ConfigEntry_s rd_kafka_ConfigEntry_t; + +/** + * @returns the configuration property name + */ +RD_EXPORT const char * +rd_kafka_ConfigEntry_name(const rd_kafka_ConfigEntry_t *entry); + +/** + * @returns the configuration value, may be NULL for sensitive or unset + * properties. + */ +RD_EXPORT const char * +rd_kafka_ConfigEntry_value(const rd_kafka_ConfigEntry_t *entry); + +/** + * @returns the config source. + */ +RD_EXPORT rd_kafka_ConfigSource_t +rd_kafka_ConfigEntry_source(const rd_kafka_ConfigEntry_t *entry); + +/** + * @returns 1 if the config property is read-only on the broker, else 0. + * @remark Shall only be used on a DescribeConfigs result, otherwise returns -1. + */ +RD_EXPORT int +rd_kafka_ConfigEntry_is_read_only(const rd_kafka_ConfigEntry_t *entry); + +/** + * @returns 1 if the config property is set to its default value on the broker, + * else 0. + * @remark Shall only be used on a DescribeConfigs result, otherwise returns -1. + */ +RD_EXPORT int +rd_kafka_ConfigEntry_is_default(const rd_kafka_ConfigEntry_t *entry); + +/** + * @returns 1 if the config property contains sensitive information (such as + * security configuration), else 0. + * @remark An application should take care not to include the value of + * sensitive configuration entries in its output. + * @remark Shall only be used on a DescribeConfigs result, otherwise returns -1. + */ +RD_EXPORT int +rd_kafka_ConfigEntry_is_sensitive(const rd_kafka_ConfigEntry_t *entry); + +/** + * @returns 1 if this entry is a synonym, else 0. + */ +RD_EXPORT int +rd_kafka_ConfigEntry_is_synonym(const rd_kafka_ConfigEntry_t *entry); + + +/** + * @returns the synonym config entry array. + * + * @param entry Entry to get synonyms for. + * @param cntp is updated to the number of elements in the array. + * + * @remark The lifetime of the returned entry is the same as \p conf . + * @remark Shall only be used on a DescribeConfigs result, + * otherwise returns NULL. + */ +RD_EXPORT const rd_kafka_ConfigEntry_t ** +rd_kafka_ConfigEntry_synonyms(const rd_kafka_ConfigEntry_t *entry, + size_t *cntp); + + + +/** + * @enum rd_kafka_ResourceType_t + * @brief Apache Kafka resource types + */ +typedef enum rd_kafka_ResourceType_t { + RD_KAFKA_RESOURCE_UNKNOWN = 0, /**< Unknown */ + RD_KAFKA_RESOURCE_ANY = 1, /**< Any (used for lookups) */ + RD_KAFKA_RESOURCE_TOPIC = 2, /**< Topic */ + RD_KAFKA_RESOURCE_GROUP = 3, /**< Group */ + RD_KAFKA_RESOURCE_BROKER = 4, /**< Broker */ + RD_KAFKA_RESOURCE__CNT, /**< Number of resource types defined */ +} rd_kafka_ResourceType_t; + +/** + * @enum rd_kafka_ResourcePatternType_t + * @brief Apache Kafka pattern types + */ +typedef enum rd_kafka_ResourcePatternType_t { + /** Unknown */ + RD_KAFKA_RESOURCE_PATTERN_UNKNOWN = 0, + /** Any (used for lookups) */ + RD_KAFKA_RESOURCE_PATTERN_ANY = 1, + /** Match: will perform pattern matching */ + RD_KAFKA_RESOURCE_PATTERN_MATCH = 2, + /** Literal: A literal resource name */ + RD_KAFKA_RESOURCE_PATTERN_LITERAL = 3, + /** Prefixed: A prefixed resource name */ + RD_KAFKA_RESOURCE_PATTERN_PREFIXED = 4, + RD_KAFKA_RESOURCE_PATTERN_TYPE__CNT, +} rd_kafka_ResourcePatternType_t; + +/** + * @returns a string representation of the \p resource_pattern_type + */ +RD_EXPORT const char *rd_kafka_ResourcePatternType_name( + rd_kafka_ResourcePatternType_t resource_pattern_type); + +/** + * @returns a string representation of the \p restype + */ +RD_EXPORT const char * +rd_kafka_ResourceType_name(rd_kafka_ResourceType_t restype); + +/*! Apache Kafka configuration resource. */ +typedef struct rd_kafka_ConfigResource_s rd_kafka_ConfigResource_t; + + +/** + * @brief Create new ConfigResource object. + * + * @param restype The resource type (e.g., RD_KAFKA_RESOURCE_TOPIC) + * @param resname The resource name (e.g., the topic name) + * + * @returns a newly allocated object + */ +RD_EXPORT rd_kafka_ConfigResource_t * +rd_kafka_ConfigResource_new(rd_kafka_ResourceType_t restype, + const char *resname); + +/** + * @brief Destroy and free a ConfigResource object previously created with + * rd_kafka_ConfigResource_new() + */ +RD_EXPORT void +rd_kafka_ConfigResource_destroy(rd_kafka_ConfigResource_t *config); + + +/** + * @brief Helper function to destroy all ConfigResource objects in + * the \p configs array (of \p config_cnt elements). + * The array itself is not freed. + */ +RD_EXPORT void +rd_kafka_ConfigResource_destroy_array(rd_kafka_ConfigResource_t **config, + size_t config_cnt); + + +/** + * @brief Set configuration name value pair. + * + * @param config ConfigResource to set config property on. + * @param name Configuration name, depends on resource type. + * @param value Configuration value, depends on resource type and \p name. + * Set to \c NULL to revert configuration value to default. + * + * This will overwrite the current value. + * + * @returns RD_KAFKA_RESP_ERR_NO_ERROR if config was added to resource, + * or RD_KAFKA_RESP_ERR__INVALID_ARG on invalid input. + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_ConfigResource_set_config(rd_kafka_ConfigResource_t *config, + const char *name, + const char *value); + + +/** + * @brief Get an array of config entries from a ConfigResource object. + * + * The returned object life-times are the same as the \p config object. + * + * @param config ConfigResource to get configs from. + * @param cntp is updated to the number of elements in the array. + */ +RD_EXPORT const rd_kafka_ConfigEntry_t ** +rd_kafka_ConfigResource_configs(const rd_kafka_ConfigResource_t *config, + size_t *cntp); + + + +/** + * @returns the ResourceType for \p config + */ +RD_EXPORT rd_kafka_ResourceType_t +rd_kafka_ConfigResource_type(const rd_kafka_ConfigResource_t *config); + +/** + * @returns the name for \p config + */ +RD_EXPORT const char * +rd_kafka_ConfigResource_name(const rd_kafka_ConfigResource_t *config); + +/** + * @returns the error for this resource from an AlterConfigs request + */ +RD_EXPORT rd_kafka_resp_err_t +rd_kafka_ConfigResource_error(const rd_kafka_ConfigResource_t *config); + +/** + * @returns the error string for this resource from an AlterConfigs + * request, or NULL if no error. + */ +RD_EXPORT const char * +rd_kafka_ConfigResource_error_string(const rd_kafka_ConfigResource_t *config); + + +/* + * AlterConfigs - alter cluster configuration. + * + */ + + +/** + * @brief Update the configuration for the specified resources. + * Updates are not transactional so they may succeed for a subset + * of the provided resources while the others fail. + * The configuration for a particular resource is updated atomically, + * replacing values using the provided ConfigEntrys and reverting + * unspecified ConfigEntrys to their default values. + * + * @remark Requires broker version >=0.11.0.0 + * + * @warning AlterConfigs will replace all existing configuration for + * the provided resources with the new configuration given, + * reverting all other configuration to their default values. + * + * @remark Multiple resources and resource types may be set, but at most one + * resource of type \c RD_KAFKA_RESOURCE_BROKER is allowed per call + * since these resource requests must be sent to the broker specified + * in the resource. + * + */ +RD_EXPORT +void rd_kafka_AlterConfigs(rd_kafka_t *rk, + rd_kafka_ConfigResource_t **configs, + size_t config_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + + +/* + * AlterConfigs result type and methods + */ + +/** + * @brief Get an array of resource results from a AlterConfigs result. + * + * Use \c rd_kafka_ConfigResource_error() and + * \c rd_kafka_ConfigResource_error_string() to extract per-resource error + * results on the returned array elements. + * + * The returned object life-times are the same as the \p result object. + * + * @param result Result object to get resource results from. + * @param cntp is updated to the number of elements in the array. + * + * @returns an array of ConfigResource elements, or NULL if not available. + */ +RD_EXPORT const rd_kafka_ConfigResource_t ** +rd_kafka_AlterConfigs_result_resources( + const rd_kafka_AlterConfigs_result_t *result, + size_t *cntp); + + + +/* + * DescribeConfigs - retrieve cluster configuration. + * + */ + + +/** + * @brief Get configuration for the specified resources in \p configs. + * + * The returned configuration includes default values and the + * rd_kafka_ConfigEntry_is_default() or rd_kafka_ConfigEntry_source() + * methods may be used to distinguish them from user supplied values. + * + * The value of config entries where rd_kafka_ConfigEntry_is_sensitive() + * is true will always be NULL to avoid disclosing sensitive + * information, such as security settings. + * + * Configuration entries where rd_kafka_ConfigEntry_is_read_only() + * is true can't be updated (with rd_kafka_AlterConfigs()). + * + * Synonym configuration entries are returned if the broker supports + * it (broker version >= 1.1.0). See rd_kafka_ConfigEntry_synonyms(). + * + * @remark Requires broker version >=0.11.0.0 + * + * @remark Multiple resources and resource types may be requested, but at most + * one resource of type \c RD_KAFKA_RESOURCE_BROKER is allowed per call + * since these resource requests must be sent to the broker specified + * in the resource. + */ +RD_EXPORT +void rd_kafka_DescribeConfigs(rd_kafka_t *rk, + rd_kafka_ConfigResource_t **configs, + size_t config_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + + + +/* + * DescribeConfigs result type and methods + */ + +/** + * @brief Get an array of resource results from a DescribeConfigs result. + * + * The returned \p resources life-time is the same as the \p result object. + * + * @param result Result object to get resource results from. + * @param cntp is updated to the number of elements in the array. + */ +RD_EXPORT const rd_kafka_ConfigResource_t ** +rd_kafka_DescribeConfigs_result_resources( + const rd_kafka_DescribeConfigs_result_t *result, + size_t *cntp); + + +/**@}*/ + +/** + * @name Admin API - DeleteRecords + * @brief delete records (messages) from partitions. + * @{ + * + */ + +/**! Represents records to be deleted */ +typedef struct rd_kafka_DeleteRecords_s rd_kafka_DeleteRecords_t; + +/** + * @brief Create a new DeleteRecords object. This object is later passed to + * rd_kafka_DeleteRecords(). + * + * \p before_offsets must contain \c topic, \c partition, and + * \c offset is the offset before which the messages will + * be deleted (exclusive). + * Set \c offset to RD_KAFKA_OFFSET_END (high-watermark) in order to + * delete all data in the partition. + * + * @param before_offsets For each partition delete all messages up to but not + * including the specified offset. + * + * @returns a new allocated DeleteRecords object. + * Use rd_kafka_DeleteRecords_destroy() to free object when done. + */ +RD_EXPORT rd_kafka_DeleteRecords_t *rd_kafka_DeleteRecords_new( + const rd_kafka_topic_partition_list_t *before_offsets); + +/** + * @brief Destroy and free a DeleteRecords object previously created with + * rd_kafka_DeleteRecords_new() + */ +RD_EXPORT void +rd_kafka_DeleteRecords_destroy(rd_kafka_DeleteRecords_t *del_records); + +/** + * @brief Helper function to destroy all DeleteRecords objects in + * the \p del_groups array (of \p del_group_cnt elements). + * The array itself is not freed. + */ +RD_EXPORT void +rd_kafka_DeleteRecords_destroy_array(rd_kafka_DeleteRecords_t **del_records, + size_t del_record_cnt); + +/** + * @brief Delete records (messages) in topic partitions older than the + * offsets provided. + * + * @param rk Client instance. + * @param del_records The offsets to delete (up to). + * Currently only one DeleteRecords_t (but containing + * multiple offsets) is supported. + * @param del_record_cnt The number of elements in del_records, must be 1. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * Supported admin options: + * - rd_kafka_AdminOptions_set_operation_timeout() - default 60 seconds. + * Controls how long the brokers will wait for records to be deleted. + * - rd_kafka_AdminOptions_set_request_timeout() - default socket.timeout.ms. + * Controls how long \c rdkafka will wait for the request to complete. + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_DELETERECORDS_RESULT + */ +RD_EXPORT void rd_kafka_DeleteRecords(rd_kafka_t *rk, + rd_kafka_DeleteRecords_t **del_records, + size_t del_record_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + + +/* + * DeleteRecords result type and methods + */ + +/** + * @brief Get a list of topic and partition results from a DeleteRecords result. + * The returned objects will contain \c topic, \c partition, \c offset + * and \c err. \c offset will be set to the post-deletion low-watermark + * (smallest available offset of all live replicas). \c err will be set + * per-partition if deletion failed. + * + * The returned object's life-time is the same as the \p result object. + */ +RD_EXPORT const rd_kafka_topic_partition_list_t * +rd_kafka_DeleteRecords_result_offsets( + const rd_kafka_DeleteRecords_result_t *result); + +/**@}*/ + +/** + * @name Admin API - ListConsumerGroups + * @{ + */ + + +/** + * @brief ListConsumerGroups result for a single group + */ + +/**! ListConsumerGroups result for a single group */ +typedef struct rd_kafka_ConsumerGroupListing_s rd_kafka_ConsumerGroupListing_t; + +/**! ListConsumerGroups results and errors */ +typedef struct rd_kafka_ListConsumerGroupsResult_s + rd_kafka_ListConsumerGroupsResult_t; + +/** + * @brief List the consumer groups available in the cluster. + * + * @param rk Client instance. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_LISTCONSUMERGROUPS_RESULT + */ +RD_EXPORT +void rd_kafka_ListConsumerGroups(rd_kafka_t *rk, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + +/** + * @brief Gets the group id for the \p grplist group. + * + * @param grplist The group listing. + * + * @return The group id. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p grplist object. + */ +RD_EXPORT +const char *rd_kafka_ConsumerGroupListing_group_id( + const rd_kafka_ConsumerGroupListing_t *grplist); + +/** + * @brief Is the \p grplist group a simple consumer group. + * + * @param grplist The group listing. + * + * @return 1 if the group is a simple consumer group, + * else 0. + */ +RD_EXPORT +int rd_kafka_ConsumerGroupListing_is_simple_consumer_group( + const rd_kafka_ConsumerGroupListing_t *grplist); + +/** + * @brief Gets state for the \p grplist group. + * + * @param grplist The group listing. + * + * @return A group state. + */ +RD_EXPORT +rd_kafka_consumer_group_state_t rd_kafka_ConsumerGroupListing_state( + const rd_kafka_ConsumerGroupListing_t *grplist); + +/** + * @brief Get an array of valid list groups from a ListConsumerGroups result. + * + * The returned groups life-time is the same as the \p result object. + * + * @param result Result to get group results from. + * @param cntp is updated to the number of elements in the array. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p result object. + */ +RD_EXPORT +const rd_kafka_ConsumerGroupListing_t ** +rd_kafka_ListConsumerGroups_result_valid( + const rd_kafka_ListConsumerGroups_result_t *result, + size_t *cntp); + +/** + * @brief Get an array of errors from a ListConsumerGroups call result. + * + * The returned errors life-time is the same as the \p result object. + * + * @param result ListConsumerGroups result. + * @param cntp Is updated to the number of elements in the array. + * + * @return Array of errors in \p result. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p result object. + */ +RD_EXPORT +const rd_kafka_error_t **rd_kafka_ListConsumerGroups_result_errors( + const rd_kafka_ListConsumerGroups_result_t *result, + size_t *cntp); + +/**@}*/ + +/** + * @name Admin API - DescribeConsumerGroups + * @{ + */ + +/** + * @brief DescribeConsumerGroups result type. + * + */ +typedef struct rd_kafka_ConsumerGroupDescription_s + rd_kafka_ConsumerGroupDescription_t; + +/** + * @brief Member description included in ConsumerGroupDescription. + * + */ +typedef struct rd_kafka_MemberDescription_s rd_kafka_MemberDescription_t; + +/** + * @brief Member assignment included in MemberDescription. + * + */ +typedef struct rd_kafka_MemberAssignment_s rd_kafka_MemberAssignment_t; + +/** + * @brief Describe groups from cluster as specified by the \p groups + * array of size \p groups_cnt elements. + * + * @param rk Client instance. + * @param groups Array of groups to describe. + * @param groups_cnt Number of elements in \p groups array. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_DESCRIBECONSUMERGROUPS_RESULT + */ +RD_EXPORT +void rd_kafka_DescribeConsumerGroups(rd_kafka_t *rk, + const char **groups, + size_t groups_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + +/** + * @brief Get an array of group results from a DescribeConsumerGroups result. + * + * The returned groups life-time is the same as the \p result object. + * + * @param result Result to get group results from. + * @param cntp is updated to the number of elements in the array. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p result object. + */ +RD_EXPORT +const rd_kafka_ConsumerGroupDescription_t ** +rd_kafka_DescribeConsumerGroups_result_groups( + const rd_kafka_DescribeConsumerGroups_result_t *result, + size_t *cntp); + + +/** + * @brief Gets the group id for the \p grpdesc group. + * + * @param grpdesc The group description. + * + * @return The group id. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p grpdesc object. + */ +RD_EXPORT +const char *rd_kafka_ConsumerGroupDescription_group_id( + const rd_kafka_ConsumerGroupDescription_t *grpdesc); + +/** + * @brief Gets the error for the \p grpdesc group. + * + * @param grpdesc The group description. + * + * @return The group description error. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p grpdesc object. + */ +RD_EXPORT +const rd_kafka_error_t *rd_kafka_ConsumerGroupDescription_error( + const rd_kafka_ConsumerGroupDescription_t *grpdesc); + +/** + * @brief Is the \p grpdesc group a simple consumer group. + * + * @param grpdesc The group description. + * @return 1 if the group is a simple consumer group, + * else 0. + */ +RD_EXPORT +int rd_kafka_ConsumerGroupDescription_is_simple_consumer_group( + const rd_kafka_ConsumerGroupDescription_t *grpdesc); + + +/** + * @brief Gets the partition assignor for the \p grpdesc group. + * + * @param grpdesc The group description. + * + * @return The partition assignor. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p grpdesc object. + */ +RD_EXPORT +const char *rd_kafka_ConsumerGroupDescription_partition_assignor( + const rd_kafka_ConsumerGroupDescription_t *grpdesc); + + +/** + * @brief Gets state for the \p grpdesc group. + * + * @param grpdesc The group description. + * + * @return A group state. + */ +RD_EXPORT +rd_kafka_consumer_group_state_t rd_kafka_ConsumerGroupDescription_state( + const rd_kafka_ConsumerGroupDescription_t *grpdesc); + +/** + * @brief Gets the coordinator for the \p grpdesc group. + * + * @param grpdesc The group description. + * + * @return The group coordinator. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p grpdesc object. + */ +RD_EXPORT +const rd_kafka_Node_t *rd_kafka_ConsumerGroupDescription_coordinator( + const rd_kafka_ConsumerGroupDescription_t *grpdesc); + +/** + * @brief Gets the members count of \p grpdesc group. + * + * @param grpdesc The group description. + * + * @return The member count. + */ +RD_EXPORT +size_t rd_kafka_ConsumerGroupDescription_member_count( + const rd_kafka_ConsumerGroupDescription_t *grpdesc); + +/** + * @brief Gets a member of \p grpdesc group. + * + * @param grpdesc The group description. + * @param idx The member idx. + * + * @return A member at index \p idx, or NULL if + * \p idx is out of range. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p grpdesc object. + */ +RD_EXPORT +const rd_kafka_MemberDescription_t *rd_kafka_ConsumerGroupDescription_member( + const rd_kafka_ConsumerGroupDescription_t *grpdesc, + size_t idx); + +/** + * @brief Gets client id of \p member. + * + * @param member The group member. + * + * @return The client id. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p member object. + */ +RD_EXPORT +const char *rd_kafka_MemberDescription_client_id( + const rd_kafka_MemberDescription_t *member); + +/** + * @brief Gets group instance id of \p member. + * + * @param member The group member. + * + * @return The group instance id, or NULL if not available. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p member object. + */ +RD_EXPORT +const char *rd_kafka_MemberDescription_group_instance_id( + const rd_kafka_MemberDescription_t *member); + +/** + * @brief Gets consumer id of \p member. + * + * @param member The group member. + * + * @return The consumer id. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p member object. + */ +RD_EXPORT +const char *rd_kafka_MemberDescription_consumer_id( + const rd_kafka_MemberDescription_t *member); + +/** + * @brief Gets host of \p member. + * + * @param member The group member. + * + * @return The host. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p member object. + */ +RD_EXPORT +const char * +rd_kafka_MemberDescription_host(const rd_kafka_MemberDescription_t *member); + +/** + * @brief Gets assignment of \p member. + * + * @param member The group member. + * + * @return The member assignment. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p member object. + */ +RD_EXPORT +const rd_kafka_MemberAssignment_t *rd_kafka_MemberDescription_assignment( + const rd_kafka_MemberDescription_t *member); + +/** + * @brief Gets assigned partitions of a member \p assignment. + * + * @param assignment The group member assignment. + * + * @return The assigned partitions. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p assignment object. + */ +RD_EXPORT +const rd_kafka_topic_partition_list_t *rd_kafka_MemberAssignment_partitions( + const rd_kafka_MemberAssignment_t *assignment); + +/**@}*/ + +/** + * @name Admin API - DeleteGroups + * @brief Delete groups from cluster + * @{ + * + * + */ + +/*! Represents a group to be deleted. */ +typedef struct rd_kafka_DeleteGroup_s rd_kafka_DeleteGroup_t; + +/** + * @brief Create a new DeleteGroup object. This object is later passed to + * rd_kafka_DeleteGroups(). + * + * @param group Name of group to delete. + * + * @returns a new allocated DeleteGroup object. + * Use rd_kafka_DeleteGroup_destroy() to free object when done. + */ +RD_EXPORT +rd_kafka_DeleteGroup_t *rd_kafka_DeleteGroup_new(const char *group); + +/** + * @brief Destroy and free a DeleteGroup object previously created with + * rd_kafka_DeleteGroup_new() + */ +RD_EXPORT +void rd_kafka_DeleteGroup_destroy(rd_kafka_DeleteGroup_t *del_group); + +/** + * @brief Helper function to destroy all DeleteGroup objects in + * the \p del_groups array (of \p del_group_cnt elements). + * The array itself is not freed. + */ +RD_EXPORT void +rd_kafka_DeleteGroup_destroy_array(rd_kafka_DeleteGroup_t **del_groups, + size_t del_group_cnt); + +/** + * @brief Delete groups from cluster as specified by the \p del_groups + * array of size \p del_group_cnt elements. + * + * @param rk Client instance. + * @param del_groups Array of groups to delete. + * @param del_group_cnt Number of elements in \p del_groups array. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_DELETEGROUPS_RESULT + * + * @remark This function in called deleteConsumerGroups in the Java client. + */ +RD_EXPORT +void rd_kafka_DeleteGroups(rd_kafka_t *rk, + rd_kafka_DeleteGroup_t **del_groups, + size_t del_group_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + + + +/* + * DeleteGroups result type and methods + */ + +/** + * @brief Get an array of group results from a DeleteGroups result. + * + * The returned groups life-time is the same as the \p result object. + * + * @param result Result to get group results from. + * @param cntp is updated to the number of elements in the array. + */ +RD_EXPORT const rd_kafka_group_result_t **rd_kafka_DeleteGroups_result_groups( + const rd_kafka_DeleteGroups_result_t *result, + size_t *cntp); + +/**@}*/ + +/** + * @name Admin API - ListConsumerGroupOffsets + * @{ + * + * + */ + +/*! Represents consumer group committed offsets to be listed. */ +typedef struct rd_kafka_ListConsumerGroupOffsets_s + rd_kafka_ListConsumerGroupOffsets_t; + +/** + * @brief Create a new ListConsumerGroupOffsets object. + * This object is later passed to rd_kafka_ListConsumerGroupOffsets(). + * + * @param group_id Consumer group id. + * @param partitions Partitions to list committed offsets for. + * Only the topic and partition fields are used. + * + * @returns a new allocated ListConsumerGroupOffsets object. + * Use rd_kafka_ListConsumerGroupOffsets_destroy() to free + * object when done. + */ +RD_EXPORT rd_kafka_ListConsumerGroupOffsets_t * +rd_kafka_ListConsumerGroupOffsets_new( + const char *group_id, + const rd_kafka_topic_partition_list_t *partitions); + +/** + * @brief Destroy and free a ListConsumerGroupOffsets object previously + * created with rd_kafka_ListConsumerGroupOffsets_new() + */ +RD_EXPORT void rd_kafka_ListConsumerGroupOffsets_destroy( + rd_kafka_ListConsumerGroupOffsets_t *list_grpoffsets); + +/** + * @brief Helper function to destroy all ListConsumerGroupOffsets objects in + * the \p list_grpoffsets array (of \p list_grpoffsets_cnt elements). + * The array itself is not freed. + */ +RD_EXPORT void rd_kafka_ListConsumerGroupOffsets_destroy_array( + rd_kafka_ListConsumerGroupOffsets_t **list_grpoffsets, + size_t list_grpoffset_cnt); + +/** + * @brief List committed offsets for a set of partitions in a consumer + * group. + * + * @param rk Client instance. + * @param list_grpoffsets Array of group committed offsets to list. + * MUST only be one single element. + * @param list_grpoffsets_cnt Number of elements in \p list_grpoffsets array. + * MUST always be 1. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_LISTCONSUMERGROUPOFFSETS_RESULT + * + * @remark The current implementation only supports one group per invocation. + */ +RD_EXPORT +void rd_kafka_ListConsumerGroupOffsets( + rd_kafka_t *rk, + rd_kafka_ListConsumerGroupOffsets_t **list_grpoffsets, + size_t list_grpoffsets_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + + + +/* + * ListConsumerGroupOffsets result type and methods + */ + +/** + * @brief Get an array of results from a ListConsumerGroupOffsets result. + * + * The returned groups life-time is the same as the \p result object. + * + * @param result Result to get group results from. + * @param cntp is updated to the number of elements in the array. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p result object. + */ +RD_EXPORT const rd_kafka_group_result_t ** +rd_kafka_ListConsumerGroupOffsets_result_groups( + const rd_kafka_ListConsumerGroupOffsets_result_t *result, + size_t *cntp); + + + +/**@}*/ + +/** + * @name Admin API - AlterConsumerGroupOffsets + * @{ + * + * + */ + +/*! Represents consumer group committed offsets to be altered. */ +typedef struct rd_kafka_AlterConsumerGroupOffsets_s + rd_kafka_AlterConsumerGroupOffsets_t; + +/** + * @brief Create a new AlterConsumerGroupOffsets object. + * This object is later passed to rd_kafka_AlterConsumerGroupOffsets(). + * + * @param group_id Consumer group id. + * @param partitions Partitions to alter committed offsets for. + * Only the topic and partition fields are used. + * + * @returns a new allocated AlterConsumerGroupOffsets object. + * Use rd_kafka_AlterConsumerGroupOffsets_destroy() to free + * object when done. + */ +RD_EXPORT rd_kafka_AlterConsumerGroupOffsets_t * +rd_kafka_AlterConsumerGroupOffsets_new( + const char *group_id, + const rd_kafka_topic_partition_list_t *partitions); + +/** + * @brief Destroy and free a AlterConsumerGroupOffsets object previously + * created with rd_kafka_AlterConsumerGroupOffsets_new() + */ +RD_EXPORT void rd_kafka_AlterConsumerGroupOffsets_destroy( + rd_kafka_AlterConsumerGroupOffsets_t *alter_grpoffsets); + +/** + * @brief Helper function to destroy all AlterConsumerGroupOffsets objects in + * the \p alter_grpoffsets array (of \p alter_grpoffsets_cnt elements). + * The array itself is not freed. + */ +RD_EXPORT void rd_kafka_AlterConsumerGroupOffsets_destroy_array( + rd_kafka_AlterConsumerGroupOffsets_t **alter_grpoffsets, + size_t alter_grpoffset_cnt); + +/** + * @brief Alter committed offsets for a set of partitions in a consumer + * group. This will succeed at the partition level only if the group + * is not actively subscribed to the corresponding topic. + * + * @param rk Client instance. + * @param alter_grpoffsets Array of group committed offsets to alter. + * MUST only be one single element. + * @param alter_grpoffsets_cnt Number of elements in \p alter_grpoffsets array. + * MUST always be 1. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_ALTERCONSUMERGROUPOFFSETS_RESULT + * + * @remark The current implementation only supports one group per invocation. + */ +RD_EXPORT +void rd_kafka_AlterConsumerGroupOffsets( + rd_kafka_t *rk, + rd_kafka_AlterConsumerGroupOffsets_t **alter_grpoffsets, + size_t alter_grpoffsets_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + + + +/* + * AlterConsumerGroupOffsets result type and methods + */ + +/** + * @brief Get an array of results from a AlterConsumerGroupOffsets result. + * + * The returned groups life-time is the same as the \p result object. + * + * @param result Result to get group results from. + * @param cntp is updated to the number of elements in the array. + * + * @remark The lifetime of the returned memory is the same + * as the lifetime of the \p result object. + */ +RD_EXPORT const rd_kafka_group_result_t ** +rd_kafka_AlterConsumerGroupOffsets_result_groups( + const rd_kafka_AlterConsumerGroupOffsets_result_t *result, + size_t *cntp); + + + +/**@}*/ + +/** + * @name Admin API - DeleteConsumerGroupOffsets + * @{ + * + * + */ + +/*! Represents consumer group committed offsets to be deleted. */ +typedef struct rd_kafka_DeleteConsumerGroupOffsets_s + rd_kafka_DeleteConsumerGroupOffsets_t; + +/** + * @brief Create a new DeleteConsumerGroupOffsets object. + * This object is later passed to rd_kafka_DeleteConsumerGroupOffsets(). + * + * @param group Consumer group id. + * @param partitions Partitions to delete committed offsets for. + * Only the topic and partition fields are used. + * + * @returns a new allocated DeleteConsumerGroupOffsets object. + * Use rd_kafka_DeleteConsumerGroupOffsets_destroy() to free + * object when done. + */ +RD_EXPORT rd_kafka_DeleteConsumerGroupOffsets_t * +rd_kafka_DeleteConsumerGroupOffsets_new( + const char *group, + const rd_kafka_topic_partition_list_t *partitions); + +/** + * @brief Destroy and free a DeleteConsumerGroupOffsets object previously + * created with rd_kafka_DeleteConsumerGroupOffsets_new() + */ +RD_EXPORT void rd_kafka_DeleteConsumerGroupOffsets_destroy( + rd_kafka_DeleteConsumerGroupOffsets_t *del_grpoffsets); + +/** + * @brief Helper function to destroy all DeleteConsumerGroupOffsets objects in + * the \p del_grpoffsets array (of \p del_grpoffsets_cnt elements). + * The array itself is not freed. + */ +RD_EXPORT void rd_kafka_DeleteConsumerGroupOffsets_destroy_array( + rd_kafka_DeleteConsumerGroupOffsets_t **del_grpoffsets, + size_t del_grpoffset_cnt); + +/** + * @brief Delete committed offsets for a set of partitions in a consumer + * group. This will succeed at the partition level only if the group + * is not actively subscribed to the corresponding topic. + * + * @param rk Client instance. + * @param del_grpoffsets Array of group committed offsets to delete. + * MUST only be one single element. + * @param del_grpoffsets_cnt Number of elements in \p del_grpoffsets array. + * MUST always be 1. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_DELETECONSUMERGROUPOFFSETS_RESULT + * + * @remark The current implementation only supports one group per invocation. + */ +RD_EXPORT +void rd_kafka_DeleteConsumerGroupOffsets( + rd_kafka_t *rk, + rd_kafka_DeleteConsumerGroupOffsets_t **del_grpoffsets, + size_t del_grpoffsets_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + + + +/* + * DeleteConsumerGroupOffsets result type and methods + */ + +/** + * @brief Get an array of results from a DeleteConsumerGroupOffsets result. + * + * The returned groups life-time is the same as the \p result object. + * + * @param result Result to get group results from. + * @param cntp is updated to the number of elements in the array. + */ +RD_EXPORT const rd_kafka_group_result_t ** +rd_kafka_DeleteConsumerGroupOffsets_result_groups( + const rd_kafka_DeleteConsumerGroupOffsets_result_t *result, + size_t *cntp); + +/**@}*/ + +/** + * @name Admin API - ACL operations + * @{ + */ + +/** + * @brief ACL Binding is used to create access control lists. + * + * + */ +typedef struct rd_kafka_AclBinding_s rd_kafka_AclBinding_t; + +/** + * @brief ACL Binding filter is used to filter access control lists. + * + */ +typedef rd_kafka_AclBinding_t rd_kafka_AclBindingFilter_t; + +/** + * @returns the error object for the given acl result, or NULL on success. + */ +RD_EXPORT const rd_kafka_error_t * +rd_kafka_acl_result_error(const rd_kafka_acl_result_t *aclres); + + +/** + * @enum rd_kafka_AclOperation_t + * @brief Apache Kafka ACL operation types. + */ +typedef enum rd_kafka_AclOperation_t { + RD_KAFKA_ACL_OPERATION_UNKNOWN = 0, /**< Unknown */ + RD_KAFKA_ACL_OPERATION_ANY = + 1, /**< In a filter, matches any AclOperation */ + RD_KAFKA_ACL_OPERATION_ALL = 2, /**< ALL operation */ + RD_KAFKA_ACL_OPERATION_READ = 3, /**< READ operation */ + RD_KAFKA_ACL_OPERATION_WRITE = 4, /**< WRITE operation */ + RD_KAFKA_ACL_OPERATION_CREATE = 5, /**< CREATE operation */ + RD_KAFKA_ACL_OPERATION_DELETE = 6, /**< DELETE operation */ + RD_KAFKA_ACL_OPERATION_ALTER = 7, /**< ALTER operation */ + RD_KAFKA_ACL_OPERATION_DESCRIBE = 8, /**< DESCRIBE operation */ + RD_KAFKA_ACL_OPERATION_CLUSTER_ACTION = + 9, /**< CLUSTER_ACTION operation */ + RD_KAFKA_ACL_OPERATION_DESCRIBE_CONFIGS = + 10, /**< DESCRIBE_CONFIGS operation */ + RD_KAFKA_ACL_OPERATION_ALTER_CONFIGS = + 11, /**< ALTER_CONFIGS operation */ + RD_KAFKA_ACL_OPERATION_IDEMPOTENT_WRITE = + 12, /**< IDEMPOTENT_WRITE operation */ + RD_KAFKA_ACL_OPERATION__CNT +} rd_kafka_AclOperation_t; + +/** + * @returns a string representation of the \p acl_operation + */ +RD_EXPORT const char * +rd_kafka_AclOperation_name(rd_kafka_AclOperation_t acl_operation); + +/** + * @enum rd_kafka_AclPermissionType_t + * @brief Apache Kafka ACL permission types. + */ +typedef enum rd_kafka_AclPermissionType_t { + RD_KAFKA_ACL_PERMISSION_TYPE_UNKNOWN = 0, /**< Unknown */ + RD_KAFKA_ACL_PERMISSION_TYPE_ANY = + 1, /**< In a filter, matches any AclPermissionType */ + RD_KAFKA_ACL_PERMISSION_TYPE_DENY = 2, /**< Disallows access */ + RD_KAFKA_ACL_PERMISSION_TYPE_ALLOW = 3, /**< Grants access. */ + RD_KAFKA_ACL_PERMISSION_TYPE__CNT +} rd_kafka_AclPermissionType_t; + +/** + * @returns a string representation of the \p acl_permission_type + */ +RD_EXPORT const char *rd_kafka_AclPermissionType_name( + rd_kafka_AclPermissionType_t acl_permission_type); + +/** + * @brief Create a new AclBinding object. This object is later passed to + * rd_kafka_CreateAcls(). + * + * @param restype The ResourceType. + * @param name The resource name. + * @param resource_pattern_type The pattern type. + * @param principal A principal, following the kafka specification. + * @param host An hostname or ip. + * @param operation A Kafka operation. + * @param permission_type A Kafka permission type. + * @param errstr An error string for returning errors or NULL to not use it. + * @param errstr_size The \p errstr size or 0 to not use it. + * + * @returns a new allocated AclBinding object, or NULL if the input parameters + * are invalid. + * Use rd_kafka_AclBinding_destroy() to free object when done. + */ +RD_EXPORT rd_kafka_AclBinding_t * +rd_kafka_AclBinding_new(rd_kafka_ResourceType_t restype, + const char *name, + rd_kafka_ResourcePatternType_t resource_pattern_type, + const char *principal, + const char *host, + rd_kafka_AclOperation_t operation, + rd_kafka_AclPermissionType_t permission_type, + char *errstr, + size_t errstr_size); + +/** + * @brief Create a new AclBindingFilter object. This object is later passed to + * rd_kafka_DescribeAcls() or + * rd_kafka_DeletesAcls() in order to filter + * the acls to retrieve or to delete. + * Use the same rd_kafka_AclBinding functions to query or destroy it. + * + * @param restype The ResourceType or \c RD_KAFKA_RESOURCE_ANY if + * not filtering by this field. + * @param name The resource name or NULL if not filtering by this field. + * @param resource_pattern_type The pattern type or \c + * RD_KAFKA_RESOURCE_PATTERN_ANY if not filtering by this field. + * @param principal A principal or NULL if not filtering by this field. + * @param host An hostname or ip or NULL if not filtering by this field. + * @param operation A Kafka operation or \c RD_KAFKA_ACL_OPERATION_ANY if not + * filtering by this field. + * @param permission_type A Kafka permission type or \c + * RD_KAFKA_ACL_PERMISSION_TYPE_ANY if not filtering by this field. + * @param errstr An error string for returning errors or NULL to not use it. + * @param errstr_size The \p errstr size or 0 to not use it. + * + * @returns a new allocated AclBindingFilter object, or NULL if the input + * parameters are invalid. Use rd_kafka_AclBinding_destroy() to free object when + * done. + */ +RD_EXPORT rd_kafka_AclBindingFilter_t *rd_kafka_AclBindingFilter_new( + rd_kafka_ResourceType_t restype, + const char *name, + rd_kafka_ResourcePatternType_t resource_pattern_type, + const char *principal, + const char *host, + rd_kafka_AclOperation_t operation, + rd_kafka_AclPermissionType_t permission_type, + char *errstr, + size_t errstr_size); + +/** + * @returns the resource type for the given acl binding. + */ +RD_EXPORT rd_kafka_ResourceType_t +rd_kafka_AclBinding_restype(const rd_kafka_AclBinding_t *acl); + +/** + * @returns the resource name for the given acl binding. + * + * @remark lifetime of the returned string is the same as the \p acl. + */ +RD_EXPORT const char * +rd_kafka_AclBinding_name(const rd_kafka_AclBinding_t *acl); + +/** + * @returns the principal for the given acl binding. + * + * @remark lifetime of the returned string is the same as the \p acl. + */ +RD_EXPORT const char * +rd_kafka_AclBinding_principal(const rd_kafka_AclBinding_t *acl); + +/** + * @returns the host for the given acl binding. + * + * @remark lifetime of the returned string is the same as the \p acl. + */ +RD_EXPORT const char * +rd_kafka_AclBinding_host(const rd_kafka_AclBinding_t *acl); + +/** + * @returns the acl operation for the given acl binding. + */ +RD_EXPORT rd_kafka_AclOperation_t +rd_kafka_AclBinding_operation(const rd_kafka_AclBinding_t *acl); + +/** + * @returns the permission type for the given acl binding. + */ +RD_EXPORT rd_kafka_AclPermissionType_t +rd_kafka_AclBinding_permission_type(const rd_kafka_AclBinding_t *acl); + +/** + * @returns the resource pattern type for the given acl binding. + */ +RD_EXPORT rd_kafka_ResourcePatternType_t +rd_kafka_AclBinding_resource_pattern_type(const rd_kafka_AclBinding_t *acl); + +/** + * @returns the error object for the given acl binding, or NULL on success. + */ +RD_EXPORT const rd_kafka_error_t * +rd_kafka_AclBinding_error(const rd_kafka_AclBinding_t *acl); + + +/** + * @brief Destroy and free an AclBinding object previously created with + * rd_kafka_AclBinding_new() + */ +RD_EXPORT void rd_kafka_AclBinding_destroy(rd_kafka_AclBinding_t *acl_binding); + + +/** + * @brief Helper function to destroy all AclBinding objects in + * the \p acl_bindings array (of \p acl_bindings_cnt elements). + * The array itself is not freed. + */ +RD_EXPORT void +rd_kafka_AclBinding_destroy_array(rd_kafka_AclBinding_t **acl_bindings, + size_t acl_bindings_cnt); + +/** + * @brief Get an array of acl results from a CreateAcls result. + * + * The returned \p acl result life-time is the same as the \p result object. + * @param result CreateAcls result to get acl results from. + * @param cntp is updated to the number of elements in the array. + */ +RD_EXPORT const rd_kafka_acl_result_t ** +rd_kafka_CreateAcls_result_acls(const rd_kafka_CreateAcls_result_t *result, + size_t *cntp); + +/** + * @brief Create acls as specified by the \p new_acls + * array of size \p new_topic_cnt elements. + * + * @param rk Client instance. + * @param new_acls Array of new acls to create. + * @param new_acls_cnt Number of elements in \p new_acls array. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * Supported admin options: + * - rd_kafka_AdminOptions_set_request_timeout() - default socket.timeout.ms + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_CREATEACLS_RESULT + */ +RD_EXPORT void rd_kafka_CreateAcls(rd_kafka_t *rk, + rd_kafka_AclBinding_t **new_acls, + size_t new_acls_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + +/** + * DescribeAcls - describe access control lists. + * + * + */ + +/** + * @brief Get an array of resource results from a DescribeAcls result. + * + * The returned \p resources life-time is the same as the \p result object. + * @param result DescribeAcls result to get acls from. + * @param cntp is updated to the number of elements in the array. + */ +RD_EXPORT const rd_kafka_AclBinding_t ** +rd_kafka_DescribeAcls_result_acls(const rd_kafka_DescribeAcls_result_t *result, + size_t *cntp); + +/** + * @brief Describe acls matching the filter provided in \p acl_filter + * + * @param rk Client instance. + * @param acl_filter Filter for the returned acls. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * Supported admin options: + * - rd_kafka_AdminOptions_set_operation_timeout() - default 0 + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_DESCRIBEACLS_RESULT + */ +RD_EXPORT void rd_kafka_DescribeAcls(rd_kafka_t *rk, + rd_kafka_AclBindingFilter_t *acl_filter, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + +/** + * DeleteAcls - delete access control lists. + * + * + */ + +typedef struct rd_kafka_DeleteAcls_result_response_s + rd_kafka_DeleteAcls_result_response_t; + +/** + * @brief Get an array of DeleteAcls result responses from a DeleteAcls result. + * + * The returned \p responses life-time is the same as the \p result object. + * @param result DeleteAcls result to get responses from. + * @param cntp is updated to the number of elements in the array. + */ +RD_EXPORT const rd_kafka_DeleteAcls_result_response_t ** +rd_kafka_DeleteAcls_result_responses(const rd_kafka_DeleteAcls_result_t *result, + size_t *cntp); + +/** + * @returns the error object for the given DeleteAcls result response, + * or NULL on success. + */ +RD_EXPORT const rd_kafka_error_t *rd_kafka_DeleteAcls_result_response_error( + const rd_kafka_DeleteAcls_result_response_t *result_response); + + +/** + * @returns the matching acls array for the given DeleteAcls result response. + * + * @remark lifetime of the returned acl bindings is the same as the \p + * result_response. + */ +RD_EXPORT const rd_kafka_AclBinding_t ** +rd_kafka_DeleteAcls_result_response_matching_acls( + const rd_kafka_DeleteAcls_result_response_t *result_response, + size_t *matching_acls_cntp); + +/** + * @brief Delete acls matching the filteres provided in \p del_acls + * array of size \p del_acls_cnt. + * + * @param rk Client instance. + * @param del_acls Filters for the acls to delete. + * @param del_acls_cnt Number of elements in \p del_acls array. + * @param options Optional admin options, or NULL for defaults. + * @param rkqu Queue to emit result on. + * + * Supported admin options: + * - rd_kafka_AdminOptions_set_operation_timeout() - default 0 + * + * @remark The result event type emitted on the supplied queue is of type + * \c RD_KAFKA_EVENT_DELETEACLS_RESULT + */ +RD_EXPORT void rd_kafka_DeleteAcls(rd_kafka_t *rk, + rd_kafka_AclBindingFilter_t **del_acls, + size_t del_acls_cnt, + const rd_kafka_AdminOptions_t *options, + rd_kafka_queue_t *rkqu); + +/**@}*/ + +/** + * @name Security APIs + * @{ + * + */ + +/** + * @brief Set SASL/OAUTHBEARER token and metadata + * + * @param rk Client instance. + * @param token_value the mandatory token value to set, often (but not + * necessarily) a JWS compact serialization as per + * https://tools.ietf.org/html/rfc7515#section-3.1. + * @param md_lifetime_ms when the token expires, in terms of the number of + * milliseconds since the epoch. + * @param md_principal_name the mandatory Kafka principal name associated + * with the token. + * @param extensions optional SASL extensions key-value array with + * \p extensions_size elements (number of keys * 2), where [i] is the key and + * [i+1] is the key's value, to be communicated to the broker + * as additional key-value pairs during the initial client response as per + * https://tools.ietf.org/html/rfc7628#section-3.1. The key-value pairs are + * copied. + * @param extension_size the number of SASL extension keys plus values, + * which must be a non-negative multiple of 2. + * @param errstr A human readable error string (nul-terminated) is written to + * this location that must be of at least \p errstr_size bytes. + * The \p errstr is only written in case of error. + * @param errstr_size Writable size in \p errstr. + * + * The SASL/OAUTHBEARER token refresh callback or event handler should invoke + * this method upon success. The extension keys must not include the reserved + * key "`auth`", and all extension keys and values must conform to the required + * format as per https://tools.ietf.org/html/rfc7628#section-3.1: + * + * key = 1*(ALPHA) + * value = *(VCHAR / SP / HTAB / CR / LF ) + * + * @returns \c RD_KAFKA_RESP_ERR_NO_ERROR on success, otherwise \p errstr set + * and:<br> + * \c RD_KAFKA_RESP_ERR__INVALID_ARG if any of the arguments are + * invalid;<br> + * \c RD_KAFKA_RESP_ERR__NOT_IMPLEMENTED if SASL/OAUTHBEARER is not + * supported by this build;<br> + * \c RD_KAFKA_RESP_ERR__STATE if SASL/OAUTHBEARER is supported but is + * not configured as the client's authentication mechanism.<br> + * + * @sa rd_kafka_oauthbearer_set_token_failure + * @sa rd_kafka_conf_set_oauthbearer_token_refresh_cb + */ +RD_EXPORT +rd_kafka_resp_err_t +rd_kafka_oauthbearer_set_token(rd_kafka_t *rk, + const char *token_value, + int64_t md_lifetime_ms, + const char *md_principal_name, + const char **extensions, + size_t extension_size, + char *errstr, + size_t errstr_size); + +/** + * @brief SASL/OAUTHBEARER token refresh failure indicator. + * + * @param rk Client instance. + * @param errstr mandatory human readable error reason for failing to acquire + * a token. + * + * The SASL/OAUTHBEARER token refresh callback or event handler should invoke + * this method upon failure. + * + * @returns \c RD_KAFKA_RESP_ERR_NO_ERROR on success, otherwise:<br> + * \c RD_KAFKA_RESP_ERR__NOT_IMPLEMENTED if SASL/OAUTHBEARER is not + * supported by this build;<br> + * \c RD_KAFKA_RESP_ERR__STATE if SASL/OAUTHBEARER is supported but is + * not configured as the client's authentication mechanism,<br> + * \c RD_KAFKA_RESP_ERR__INVALID_ARG if no error string is supplied. + * + * @sa rd_kafka_oauthbearer_set_token + * @sa rd_kafka_conf_set_oauthbearer_token_refresh_cb + */ +RD_EXPORT +rd_kafka_resp_err_t rd_kafka_oauthbearer_set_token_failure(rd_kafka_t *rk, + const char *errstr); + +/**@}*/ + + +/** + * @name Transactional producer API + * + * The transactional producer operates on top of the idempotent producer, + * and provides full exactly-once semantics (EOS) for Apache Kafka when used + * with the transaction aware consumer (\c isolation.level=read_committed). + * + * A producer instance is configured for transactions by setting the + * \c transactional.id to an identifier unique for the application. This + * id will be used to fence stale transactions from previous instances of + * the application, typically following an outage or crash. + * + * After creating the transactional producer instance using rd_kafka_new() + * the transactional state must be initialized by calling + * rd_kafka_init_transactions(). This is a blocking call that will + * acquire a runtime producer id from the transaction coordinator broker + * as well as abort any stale transactions and fence any still running producer + * instances with the same \c transactional.id. + * + * Once transactions are initialized the application may begin a new + * transaction by calling rd_kafka_begin_transaction(). + * A producer instance may only have one single on-going transaction. + * + * Any messages produced after the transaction has been started will + * belong to the ongoing transaction and will be committed or aborted + * atomically. + * It is not permitted to produce messages outside a transaction + * boundary, e.g., before rd_kafka_begin_transaction() or after + * rd_kafka_commit_transaction(), rd_kafka_abort_transaction(), or after + * the current transaction has failed. + * + * If consumed messages are used as input to the transaction, the consumer + * instance must be configured with \c enable.auto.commit set to \c false. + * To commit the consumed offsets along with the transaction pass the + * list of consumed partitions and the last offset processed + 1 to + * rd_kafka_send_offsets_to_transaction() prior to committing the transaction. + * This allows an aborted transaction to be restarted using the previously + * committed offsets. + * + * To commit the produced messages, and any consumed offsets, to the + * current transaction, call rd_kafka_commit_transaction(). + * This call will block until the transaction has been fully committed or + * failed (typically due to fencing by a newer producer instance). + * + * Alternatively, if processing fails, or an abortable transaction error is + * raised, the transaction needs to be aborted by calling + * rd_kafka_abort_transaction() which marks any produced messages and + * offset commits as aborted. + * + * After the current transaction has been committed or aborted a new + * transaction may be started by calling rd_kafka_begin_transaction() again. + * + * @par Retriable errors + * Some error cases allow the attempted operation to be retried, this is + * indicated by the error object having the retriable flag set which can + * be detected by calling rd_kafka_error_is_retriable(). + * When this flag is set the application may retry the operation immediately + * or preferably after a shorter grace period (to avoid busy-looping). + * Retriable errors include timeouts, broker transport failures, etc. + * + * @par Abortable errors + * An ongoing transaction may fail permanently due to various errors, + * such as transaction coordinator becoming unavailable, write failures to the + * Apache Kafka log, under-replicated partitions, etc. + * At this point the producer application must abort the current transaction + * using rd_kafka_abort_transaction() and optionally start a new transaction + * by calling rd_kafka_begin_transaction(). + * Whether an error is abortable or not is detected by calling + * rd_kafka_error_txn_requires_abort() on the returned error object. + * + * @par Fatal errors + * While the underlying idempotent producer will typically only raise + * fatal errors for unrecoverable cluster errors where the idempotency + * guarantees can't be maintained, most of these are treated as abortable by + * the transactional producer since transactions may be aborted and retried + * in their entirety; + * The transactional producer on the other hand introduces a set of additional + * fatal errors which the application needs to handle by shutting down the + * producer and terminate. There is no way for a producer instance to recover + * from fatal errors. + * Whether an error is fatal or not is detected by calling + * rd_kafka_error_is_fatal() on the returned error object or by checking + * the global rd_kafka_fatal_error() code. + * Fatal errors are raised by triggering the \c error_cb (see the + * Fatal error chapter in INTRODUCTION.md for more information), and any + * subsequent transactional API calls will return RD_KAFKA_RESP_ERR__FATAL + * or have the fatal flag set (see rd_kafka_error_is_fatal()). + * The originating fatal error code can be retrieved by calling + * rd_kafka_fatal_error(). + * + * @par Handling of other errors + * For errors that have neither retriable, abortable or the fatal flag set + * it is not always obvious how to handle them. While some of these errors + * may be indicative of bugs in the application code, such as when + * an invalid parameter is passed to a method, other errors might originate + * from the broker and be passed thru as-is to the application. + * The general recommendation is to treat these errors, that have + * neither the retriable or abortable flags set, as fatal. + * + * @par Error handling example + * @code + * retry: + * rd_kafka_error_t *error; + * + * error = rd_kafka_commit_transaction(producer, 10*1000); + * if (!error) + * return success; + * else if (rd_kafka_error_txn_requires_abort(error)) { + * do_abort_transaction_and_reset_inputs(); + * } else if (rd_kafka_error_is_retriable(error)) { + * rd_kafka_error_destroy(error); + * goto retry; + * } else { // treat all other errors as fatal errors + * fatal_error(rd_kafka_error_string(error)); + * } + * rd_kafka_error_destroy(error); + * @endcode + * + * + * @{ + */ + + +/** + * @brief Initialize transactions for the producer instance. + * + * This function ensures any transactions initiated by previous instances + * of the producer with the same \c transactional.id are completed. + * If the previous instance failed with a transaction in progress the + * previous transaction will be aborted. + * This function needs to be called before any other transactional or + * produce functions are called when the \c transactional.id is configured. + * + * If the last transaction had begun completion (following transaction commit) + * but not yet finished, this function will await the previous transaction's + * completion. + * + * When any previous transactions have been fenced this function + * will acquire the internal producer id and epoch, used in all future + * transactional messages issued by this producer instance. + * + * @param rk Producer instance. + * @param timeout_ms The maximum time to block. On timeout the operation + * may continue in the background, depending on state, + * and it is okay to call init_transactions() again. + * If an infinite timeout (-1) is passed, the timeout will + * be adjusted to 2 * \c transaction.timeout.ms. + * + * @remark This function may block up to \p timeout_ms milliseconds. + * + * @remark This call is resumable when a retriable timeout error is returned. + * Calling the function again will resume the operation that is + * progressing in the background. + * + * @returns NULL on success or an error object on failure. + * Check whether the returned error object permits retrying + * by calling rd_kafka_error_is_retriable(), or whether a fatal + * error has been raised by calling rd_kafka_error_is_fatal(). + * Error codes: + * RD_KAFKA_RESP_ERR__TIMED_OUT if the transaction coordinator + * could be not be contacted within \p timeout_ms (retriable), + * RD_KAFKA_RESP_ERR_COORDINATOR_NOT_AVAILABLE if the transaction + * coordinator is not available (retriable), + * RD_KAFKA_RESP_ERR_CONCURRENT_TRANSACTIONS if a previous transaction + * would not complete within \p timeout_ms (retriable), + * RD_KAFKA_RESP_ERR__STATE if transactions have already been started + * or upon fatal error, + * RD_KAFKA_RESP_ERR__UNSUPPORTED_FEATURE if the broker(s) do not + * support transactions (<Apache Kafka 0.11), this also raises a + * fatal error, + * RD_KAFKA_RESP_ERR_INVALID_TRANSACTION_TIMEOUT if the configured + * \c transaction.timeout.ms is outside the broker-configured range, + * this also raises a fatal error, + * RD_KAFKA_RESP_ERR__NOT_CONFIGURED if transactions have not been + * configured for the producer instance, + * RD_KAFKA_RESP_ERR__INVALID_ARG if \p rk is not a producer instance, + * or \p timeout_ms is out of range. + * Other error codes not listed here may be returned, depending on + * broker version. + * + * @remark The returned error object (if not NULL) must be destroyed with + * rd_kafka_error_destroy(). + */ +RD_EXPORT +rd_kafka_error_t *rd_kafka_init_transactions(rd_kafka_t *rk, int timeout_ms); + + + +/** + * @brief Begin a new transaction. + * + * rd_kafka_init_transactions() must have been called successfully (once) + * before this function is called. + * + * Upon successful return from this function the application has to perform at + * least one of the following operations within \c transaction.timeout.ms to + * avoid timing out the transaction on the broker: + * * rd_kafka_produce() (et.al) + * * rd_kafka_send_offsets_to_transaction() + * * rd_kafka_commit_transaction() + * * rd_kafka_abort_transaction() + * + * Any messages produced, offsets sent (rd_kafka_send_offsets_to_transaction()), + * etc, after the successful return of this function will be part of + * the transaction and committed or aborted atomatically. + * + * Finish the transaction by calling rd_kafka_commit_transaction() or + * abort the transaction by calling rd_kafka_abort_transaction(). + * + * @param rk Producer instance. + * + * @returns NULL on success or an error object on failure. + * Check whether a fatal error has been raised by + * calling rd_kafka_error_is_fatal(). + * Error codes: + * RD_KAFKA_RESP_ERR__STATE if a transaction is already in progress + * or upon fatal error, + * RD_KAFKA_RESP_ERR__NOT_CONFIGURED if transactions have not been + * configured for the producer instance, + * RD_KAFKA_RESP_ERR__INVALID_ARG if \p rk is not a producer instance. + * Other error codes not listed here may be returned, depending on + * broker version. + * + * @remark With the transactional producer, rd_kafka_produce(), + * rd_kafka_producev(), et.al, are only allowed during an on-going + * transaction, as started with this function. + * Any produce call outside an on-going transaction, or for a failed + * transaction, will fail. + * + * @remark The returned error object (if not NULL) must be destroyed with + * rd_kafka_error_destroy(). + */ +RD_EXPORT +rd_kafka_error_t *rd_kafka_begin_transaction(rd_kafka_t *rk); + + +/** + * @brief Sends a list of topic partition offsets to the consumer group + * coordinator for \p cgmetadata, and marks the offsets as part + * part of the current transaction. + * These offsets will be considered committed only if the transaction is + * committed successfully. + * + * The offsets should be the next message your application will consume, + * i.e., the last processed message's offset + 1 for each partition. + * Either track the offsets manually during processing or use + * rd_kafka_position() (on the consumer) to get the current offsets for + * the partitions assigned to the consumer. + * + * Use this method at the end of a consume-transform-produce loop prior + * to committing the transaction with rd_kafka_commit_transaction(). + * + * @param rk Producer instance. + * @param offsets List of offsets to commit to the consumer group upon + * successful commit of the transaction. Offsets should be + * the next message to consume, e.g., last processed message + 1. + * @param cgmetadata The current consumer group metadata as returned by + * rd_kafka_consumer_group_metadata() on the consumer + * instance the provided offsets were consumed from. + * @param timeout_ms Maximum time allowed to register the offsets on the broker. + * + * @remark This function must be called on the transactional producer instance, + * not the consumer. + * + * @remark The consumer must disable auto commits + * (set \c enable.auto.commit to false on the consumer). + * + * @remark Logical and invalid offsets (such as RD_KAFKA_OFFSET_INVALID) in + * \p offsets will be ignored, if there are no valid offsets in + * \p offsets the function will return NULL and no action will be taken. + * + * @remark This call is retriable but not resumable, which means a new request + * with a new set of provided offsets and group metadata will be + * sent to the transaction coordinator if the call is retried. + * + * @remark It is highly recommended to retry the call (upon retriable error) + * with identical \p offsets and \p cgmetadata parameters. + * Failure to do so risks inconsistent state between what is actually + * included in the transaction and what the application thinks is + * included in the transaction. + * + * @returns NULL on success or an error object on failure. + * Check whether the returned error object permits retrying + * by calling rd_kafka_error_is_retriable(), or whether an abortable + * or fatal error has been raised by calling + * rd_kafka_error_txn_requires_abort() or rd_kafka_error_is_fatal() + * respectively. + * Error codes: + * RD_KAFKA_RESP_ERR__STATE if not currently in a transaction, + * RD_KAFKA_RESP_ERR_INVALID_PRODUCER_EPOCH if the current producer + * transaction has been fenced by a newer producer instance, + * RD_KAFKA_RESP_ERR_TRANSACTIONAL_ID_AUTHORIZATION_FAILED if the + * producer is no longer authorized to perform transactional + * operations, + * RD_KAFKA_RESP_ERR_GROUP_AUTHORIZATION_FAILED if the producer is + * not authorized to write the consumer offsets to the group + * coordinator, + * RD_KAFKA_RESP_ERR__NOT_CONFIGURED if transactions have not been + * configured for the producer instance, + * RD_KAFKA_RESP_ERR__INVALID_ARG if \p rk is not a producer instance, + * or if the \p consumer_group_id or \p offsets are empty. + * Other error codes not listed here may be returned, depending on + * broker version. + * + * @remark The returned error object (if not NULL) must be destroyed with + * rd_kafka_error_destroy(). + */ +RD_EXPORT +rd_kafka_error_t *rd_kafka_send_offsets_to_transaction( + rd_kafka_t *rk, + const rd_kafka_topic_partition_list_t *offsets, + const rd_kafka_consumer_group_metadata_t *cgmetadata, + int timeout_ms); + + +/** + * @brief Commit the current transaction (as started with + * rd_kafka_begin_transaction()). + * + * Any outstanding messages will be flushed (delivered) before actually + * committing the transaction. + * + * If any of the outstanding messages fail permanently the current + * transaction will enter the abortable error state and this + * function will return an abortable error, in this case the application + * must call rd_kafka_abort_transaction() before attempting a new + * transaction with rd_kafka_begin_transaction(). + * + * @param rk Producer instance. + * @param timeout_ms The maximum time to block. On timeout the operation + * may continue in the background, depending on state, + * and it is okay to call this function again. + * Pass -1 to use the remaining transaction timeout, + * this is the recommended use. + * + * @remark It is strongly recommended to always pass -1 (remaining transaction + * time) as the \p timeout_ms. Using other values risk internal + * state desynchronization in case any of the underlying protocol + * requests fail. + * + * @remark This function will block until all outstanding messages are + * delivered and the transaction commit request has been successfully + * handled by the transaction coordinator, or until \p timeout_ms + * expires, which ever comes first. On timeout the application may + * call the function again. + * + * @remark Will automatically call rd_kafka_flush() to ensure all queued + * messages are delivered before attempting to commit the + * transaction. + * If the application has enabled RD_KAFKA_EVENT_DR it must + * serve the event queue in a separate thread since rd_kafka_flush() + * will not serve delivery reports in this mode. + * + * @remark This call is resumable when a retriable timeout error is returned. + * Calling the function again will resume the operation that is + * progressing in the background. + * + * @returns NULL on success or an error object on failure. + * Check whether the returned error object permits retrying + * by calling rd_kafka_error_is_retriable(), or whether an abortable + * or fatal error has been raised by calling + * rd_kafka_error_txn_requires_abort() or rd_kafka_error_is_fatal() + * respectively. + * Error codes: + * RD_KAFKA_RESP_ERR__STATE if not currently in a transaction, + * RD_KAFKA_RESP_ERR__TIMED_OUT if the transaction could not be + * complete commmitted within \p timeout_ms, this is a retriable + * error as the commit continues in the background, + * RD_KAFKA_RESP_ERR_INVALID_PRODUCER_EPOCH if the current producer + * transaction has been fenced by a newer producer instance, + * RD_KAFKA_RESP_ERR_TRANSACTIONAL_ID_AUTHORIZATION_FAILED if the + * producer is no longer authorized to perform transactional + * operations, + * RD_KAFKA_RESP_ERR__NOT_CONFIGURED if transactions have not been + * configured for the producer instance, + * RD_KAFKA_RESP_ERR__INVALID_ARG if \p rk is not a producer instance, + * Other error codes not listed here may be returned, depending on + * broker version. + * + * @remark The returned error object (if not NULL) must be destroyed with + * rd_kafka_error_destroy(). + */ +RD_EXPORT +rd_kafka_error_t *rd_kafka_commit_transaction(rd_kafka_t *rk, int timeout_ms); + + +/** + * @brief Aborts the ongoing transaction. + * + * This function should also be used to recover from non-fatal abortable + * transaction errors. + * + * Any outstanding messages will be purged and fail with + * RD_KAFKA_RESP_ERR__PURGE_INFLIGHT or RD_KAFKA_RESP_ERR__PURGE_QUEUE. + * See rd_kafka_purge() for details. + * + * @param rk Producer instance. + * @param timeout_ms The maximum time to block. On timeout the operation + * may continue in the background, depending on state, + * and it is okay to call this function again. + * Pass -1 to use the remaining transaction timeout, + * this is the recommended use. + * + * @remark It is strongly recommended to always pass -1 (remaining transaction + * time) as the \p timeout_ms. Using other values risk internal + * state desynchronization in case any of the underlying protocol + * requests fail. + * + * @remark This function will block until all outstanding messages are purged + * and the transaction abort request has been successfully + * handled by the transaction coordinator, or until \p timeout_ms + * expires, which ever comes first. On timeout the application may + * call the function again. + * If the application has enabled RD_KAFKA_EVENT_DR it must + * serve the event queue in a separate thread since rd_kafka_flush() + * will not serve delivery reports in this mode. + * + * @remark This call is resumable when a retriable timeout error is returned. + * Calling the function again will resume the operation that is + * progressing in the background. + * + * @returns NULL on success or an error object on failure. + * Check whether the returned error object permits retrying + * by calling rd_kafka_error_is_retriable(), or whether a fatal error + * has been raised by calling rd_kafka_error_is_fatal(). + * Error codes: + * RD_KAFKA_RESP_ERR__STATE if not currently in a transaction, + * RD_KAFKA_RESP_ERR__TIMED_OUT if the transaction could not be + * complete commmitted within \p timeout_ms, this is a retriable + * error as the commit continues in the background, + * RD_KAFKA_RESP_ERR_INVALID_PRODUCER_EPOCH if the current producer + * transaction has been fenced by a newer producer instance, + * RD_KAFKA_RESP_ERR_TRANSACTIONAL_ID_AUTHORIZATION_FAILED if the + * producer is no longer authorized to perform transactional + * operations, + * RD_KAFKA_RESP_ERR__NOT_CONFIGURED if transactions have not been + * configured for the producer instance, + * RD_KAFKA_RESP_ERR__INVALID_ARG if \p rk is not a producer instance, + * Other error codes not listed here may be returned, depending on + * broker version. + * + * @remark The returned error object (if not NULL) must be destroyed with + * rd_kafka_error_destroy(). + */ +RD_EXPORT +rd_kafka_error_t *rd_kafka_abort_transaction(rd_kafka_t *rk, int timeout_ms); + + +/**@}*/ + +/* @cond NO_DOC */ +#ifdef __cplusplus +} +#endif +#endif /* _RDKAFKA_H_ */ +/* @endcond NO_DOC */ |