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|
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2015-2022 The Fluent Bit Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <fluent-bit/flb_output_plugin.h>
#include <fluent-bit/flb_time.h>
#include <fluent-bit/flb_pack.h>
#include <fluent-bit/flb_utils.h>
#include <fluent-bit/flb_log_event_decoder.h>
#include "kafka_config.h"
#include "kafka_topic.h"
void cb_kafka_msg(rd_kafka_t *rk, const rd_kafka_message_t *rkmessage,
void *opaque)
{
struct flb_out_kafka *ctx = (struct flb_out_kafka *) opaque;
if (rkmessage->err) {
flb_plg_warn(ctx->ins, "message delivery failed: %s",
rd_kafka_err2str(rkmessage->err));
}
else {
flb_plg_debug(ctx->ins, "message delivered (%zd bytes, "
"partition %"PRId32")",
rkmessage->len, rkmessage->partition);
}
}
void cb_kafka_logger(const rd_kafka_t *rk, int level,
const char *fac, const char *buf)
{
struct flb_out_kafka *ctx;
ctx = (struct flb_out_kafka *) rd_kafka_opaque(rk);
if (level <= FLB_KAFKA_LOG_ERR) {
flb_plg_error(ctx->ins, "%s: %s",
rk ? rd_kafka_name(rk) : NULL, buf);
}
else if (level == FLB_KAFKA_LOG_WARNING) {
flb_plg_warn(ctx->ins, "%s: %s",
rk ? rd_kafka_name(rk) : NULL, buf);
}
else if (level == FLB_KAFKA_LOG_NOTICE || level == FLB_KAFKA_LOG_INFO) {
flb_plg_info(ctx->ins, "%s: %s",
rk ? rd_kafka_name(rk) : NULL, buf);
}
else if (level == FLB_KAFKA_LOG_DEBUG) {
flb_plg_debug(ctx->ins, "%s: %s",
rk ? rd_kafka_name(rk) : NULL, buf);
}
}
static int cb_kafka_init(struct flb_output_instance *ins,
struct flb_config *config,
void *data)
{
struct flb_out_kafka *ctx;
/* Configuration */
ctx = flb_out_kafka_create(ins, config);
if (!ctx) {
flb_plg_error(ins, "failed to initialize");
return -1;
}
/* Set global context */
flb_output_set_context(ins, ctx);
return 0;
}
int produce_message(struct flb_time *tm, msgpack_object *map,
struct flb_out_kafka *ctx, struct flb_config *config)
{
int i;
int ret;
int size;
int queue_full_retries = 0;
char *out_buf;
size_t out_size;
struct mk_list *head;
struct mk_list *topics;
struct flb_split_entry *entry;
char *dynamic_topic;
char *message_key = NULL;
size_t message_key_len = 0;
struct flb_kafka_topic *topic = NULL;
msgpack_sbuffer mp_sbuf;
msgpack_packer mp_pck;
msgpack_object key;
msgpack_object val;
flb_sds_t s;
#ifdef FLB_HAVE_AVRO_ENCODER
// used to flag when a buffer needs to be freed for avro
bool avro_fast_buffer = true;
// avro encoding uses a buffer
// the majority of lines are fairly small
// so using static buffer for these is much more efficient
// larger sizes will allocate
#ifndef AVRO_DEFAULT_BUFFER_SIZE
#define AVRO_DEFAULT_BUFFER_SIZE 2048
#endif
static char avro_buff[AVRO_DEFAULT_BUFFER_SIZE];
// don't take lines that are too large
// these lines will log a warning
// this roughly a log line of 250000 chars
#ifndef AVRO_LINE_MAX_LEN
#define AVRO_LINE_MAX_LEN 1000000
// this is a convenience
#define AVRO_FREE(X, Y) if (!X) { flb_free(Y); }
#endif
// this is just to keep the code cleaner
// the avro encoding includes
// an embedded schemaid which is used
// the embedding is a null byte
// followed by a 16 byte schemaid
#define AVRO_SCHEMA_OVERHEAD 16 + 1
#endif
flb_debug("in produce_message\n");
if (flb_log_check(FLB_LOG_DEBUG))
msgpack_object_print(stderr, *map);
/* Init temporal buffers */
msgpack_sbuffer_init(&mp_sbuf);
msgpack_packer_init(&mp_pck, &mp_sbuf, msgpack_sbuffer_write);
if (ctx->format == FLB_KAFKA_FMT_JSON || ctx->format == FLB_KAFKA_FMT_MSGP) {
/* Make room for the timestamp */
size = map->via.map.size + 1;
msgpack_pack_map(&mp_pck, size);
/* Pack timestamp */
msgpack_pack_str(&mp_pck, ctx->timestamp_key_len);
msgpack_pack_str_body(&mp_pck,
ctx->timestamp_key, ctx->timestamp_key_len);
switch (ctx->timestamp_format) {
case FLB_JSON_DATE_DOUBLE:
msgpack_pack_double(&mp_pck, flb_time_to_double(tm));
break;
case FLB_JSON_DATE_ISO8601:
case FLB_JSON_DATE_ISO8601_NS:
{
size_t date_len;
int len;
struct tm _tm;
char time_formatted[36];
/* Format the time; use microsecond precision (not nanoseconds). */
gmtime_r(&tm->tm.tv_sec, &_tm);
date_len = strftime(time_formatted, sizeof(time_formatted) - 1,
FLB_JSON_DATE_ISO8601_FMT, &_tm);
if (ctx->timestamp_format == FLB_JSON_DATE_ISO8601) {
len = snprintf(time_formatted + date_len, sizeof(time_formatted) - 1 - date_len,
".%06" PRIu64 "Z", (uint64_t) tm->tm.tv_nsec / 1000);
}
else {
/* FLB_JSON_DATE_ISO8601_NS */
len = snprintf(time_formatted + date_len, sizeof(time_formatted) - 1 - date_len,
".%09" PRIu64 "Z", (uint64_t) tm->tm.tv_nsec);
}
date_len += len;
msgpack_pack_str(&mp_pck, date_len);
msgpack_pack_str_body(&mp_pck, time_formatted, date_len);
}
break;
}
}
else {
size = map->via.map.size;
msgpack_pack_map(&mp_pck, size);
}
for (i = 0; i < map->via.map.size; i++) {
key = map->via.map.ptr[i].key;
val = map->via.map.ptr[i].val;
msgpack_pack_object(&mp_pck, key);
msgpack_pack_object(&mp_pck, val);
/* Lookup message key */
if (ctx->message_key_field && !message_key && val.type == MSGPACK_OBJECT_STR) {
if (key.via.str.size == ctx->message_key_field_len &&
strncmp(key.via.str.ptr, ctx->message_key_field, ctx->message_key_field_len) == 0) {
message_key = (char *) val.via.str.ptr;
message_key_len = val.via.str.size;
}
}
/* Lookup key/topic */
if (ctx->topic_key && !topic && val.type == MSGPACK_OBJECT_STR) {
if (key.via.str.size == ctx->topic_key_len &&
strncmp(key.via.str.ptr, ctx->topic_key, ctx->topic_key_len) == 0) {
topic = flb_kafka_topic_lookup((char *) val.via.str.ptr,
val.via.str.size, ctx);
/* Add extracted topic on the fly to topiclist */
if (ctx->dynamic_topic) {
/* Only if default topic is set and this topicname is not set for this message */
if (strncmp(topic->name, flb_kafka_topic_default(ctx)->name, val.via.str.size) == 0 &&
(strncmp(topic->name, val.via.str.ptr, val.via.str.size) != 0) ) {
if (memchr(val.via.str.ptr, ',', val.via.str.size)) {
/* Don't allow commas in kafkatopic name */
flb_warn("',' not allowed in dynamic_kafka topic names");
continue;
}
if (val.via.str.size > 64) {
/* Don't allow length of dynamic kafka topics > 64 */
flb_warn(" dynamic kafka topic length > 64 not allowed");
continue;
}
dynamic_topic = flb_malloc(val.via.str.size + 1);
if (!dynamic_topic) {
/* Use default topic */
flb_errno();
continue;
}
strncpy(dynamic_topic, val.via.str.ptr, val.via.str.size);
dynamic_topic[val.via.str.size] = '\0';
topics = flb_utils_split(dynamic_topic, ',', 0);
if (!topics) {
/* Use the default topic */
flb_errno();
flb_free(dynamic_topic);
continue;
}
mk_list_foreach(head, topics) {
/* Add the (one) found topicname to the topic configuration */
entry = mk_list_entry(head, struct flb_split_entry, _head);
topic = flb_kafka_topic_create(entry->value, ctx);
if (!topic) {
/* Use default topic */
flb_error("[out_kafka] cannot register topic '%s'",
entry->value);
topic = flb_kafka_topic_lookup((char *) val.via.str.ptr,
val.via.str.size, ctx);
}
else {
flb_info("[out_kafka] new topic added: %s", dynamic_topic);
}
}
flb_free(dynamic_topic);
}
}
}
}
}
if (ctx->format == FLB_KAFKA_FMT_JSON) {
s = flb_msgpack_raw_to_json_sds(mp_sbuf.data, mp_sbuf.size);
if (!s) {
flb_plg_error(ctx->ins, "error encoding to JSON");
msgpack_sbuffer_destroy(&mp_sbuf);
return FLB_ERROR;
}
out_buf = s;
out_size = flb_sds_len(out_buf);
}
else if (ctx->format == FLB_KAFKA_FMT_MSGP) {
out_buf = mp_sbuf.data;
out_size = mp_sbuf.size;
}
else if (ctx->format == FLB_KAFKA_FMT_GELF) {
s = flb_msgpack_raw_to_gelf(mp_sbuf.data, mp_sbuf.size,
tm, &(ctx->gelf_fields));
if (s == NULL) {
flb_plg_error(ctx->ins, "error encoding to GELF");
msgpack_sbuffer_destroy(&mp_sbuf);
return FLB_ERROR;
}
out_buf = s;
out_size = flb_sds_len(s);
}
#ifdef FLB_HAVE_AVRO_ENCODER
else if (ctx->format == FLB_KAFKA_FMT_AVRO) {
flb_plg_debug(ctx->ins, "avro schema ID:%s:\n", ctx->avro_fields.schema_id);
flb_plg_debug(ctx->ins, "avro schema string:%s:\n", ctx->avro_fields.schema_str);
// if there's no data then log it and return
if (mp_sbuf.size == 0) {
flb_plg_error(ctx->ins, "got zero bytes decoding to avro AVRO:schemaID:%s:\n", ctx->avro_fields.schema_id);
msgpack_sbuffer_destroy(&mp_sbuf);
return FLB_OK;
}
// is the line is too long log it and return
if (mp_sbuf.size > AVRO_LINE_MAX_LEN) {
flb_plg_warn(ctx->ins, "skipping long line AVRO:len:%zu:limit:%zu:schemaID:%s:\n", (size_t)mp_sbuf.size, (size_t)AVRO_LINE_MAX_LEN, ctx->avro_fields.schema_id);
msgpack_sbuffer_destroy(&mp_sbuf);
return FLB_OK;
}
flb_plg_debug(ctx->ins, "using default buffer AVRO:len:%zu:limit:%zu:schemaID:%s:\n", (size_t)mp_sbuf.size, (size_t)AVRO_DEFAULT_BUFFER_SIZE, ctx->avro_fields.schema_id);
out_buf = avro_buff;
out_size = AVRO_DEFAULT_BUFFER_SIZE;
if (mp_sbuf.size + AVRO_SCHEMA_OVERHEAD >= AVRO_DEFAULT_BUFFER_SIZE) {
flb_plg_info(ctx->ins, "upsizing to dynamic buffer AVRO:len:%zu:schemaID:%s:\n", (size_t)mp_sbuf.size, ctx->avro_fields.schema_id);
avro_fast_buffer = false;
// avro will always be smaller than msgpack
// it contains no meta-info aside from the schemaid
// all the metadata is in the schema which is not part of the msg
// add schemaid + magic byte for safety buffer and allocate
// that's 16 byte schemaid and one byte magic byte
out_size = mp_sbuf.size + AVRO_SCHEMA_OVERHEAD;
out_buf = flb_malloc(out_size);
if (!out_buf) {
flb_plg_error(ctx->ins, "error allocating memory for decoding to AVRO:schema:%s:schemaID:%s:\n", ctx->avro_fields.schema_str, ctx->avro_fields.schema_id);
msgpack_sbuffer_destroy(&mp_sbuf);
return FLB_ERROR;
}
}
if(!flb_msgpack_raw_to_avro_sds(mp_sbuf.data, mp_sbuf.size, &ctx->avro_fields, out_buf, &out_size)) {
flb_plg_error(ctx->ins, "error encoding to AVRO:schema:%s:schemaID:%s:\n", ctx->avro_fields.schema_str, ctx->avro_fields.schema_id);
msgpack_sbuffer_destroy(&mp_sbuf);
if (!avro_fast_buffer) {
flb_free(out_buf);
}
return FLB_ERROR;
}
}
#endif
if (!message_key) {
message_key = ctx->message_key;
message_key_len = ctx->message_key_len;
}
if (!topic) {
topic = flb_kafka_topic_default(ctx);
}
if (!topic) {
flb_plg_error(ctx->ins, "no default topic found");
msgpack_sbuffer_destroy(&mp_sbuf);
#ifdef FLB_HAVE_AVRO_ENCODER
if (ctx->format == FLB_KAFKA_FMT_AVRO) {
AVRO_FREE(avro_fast_buffer, out_buf)
}
#endif
return FLB_ERROR;
}
retry:
/*
* If the local rdkafka queue is full, we retry up to 'queue_full_retries'
* times set by the configuration (default: 10). If the configuration
* property was set to '0' or 'false', we don't impose a limit. Use that
* value under your own risk.
*/
if (ctx->queue_full_retries > 0 &&
queue_full_retries >= ctx->queue_full_retries) {
if (ctx->format != FLB_KAFKA_FMT_MSGP) {
flb_sds_destroy(s);
}
msgpack_sbuffer_destroy(&mp_sbuf);
#ifdef FLB_HAVE_AVRO_ENCODER
if (ctx->format == FLB_KAFKA_FMT_AVRO) {
AVRO_FREE(avro_fast_buffer, out_buf)
}
#endif
/*
* Unblock the flush requests so that the
* engine could try sending data again.
*/
ctx->blocked = FLB_FALSE;
return FLB_RETRY;
}
ret = rd_kafka_produce(topic->tp,
RD_KAFKA_PARTITION_UA,
RD_KAFKA_MSG_F_COPY,
out_buf, out_size,
message_key, message_key_len,
ctx);
if (ret == -1) {
flb_error(
"%% Failed to produce to topic %s: %s\n",
rd_kafka_topic_name(topic->tp),
rd_kafka_err2str(rd_kafka_last_error()));
/*
* rdkafka queue is full, keep trying 'locally' for a few seconds,
* otherwise let the caller to issue a main retry againt the engine.
*/
if (rd_kafka_last_error() == RD_KAFKA_RESP_ERR__QUEUE_FULL) {
flb_plg_warn(ctx->ins,
"internal queue is full, retrying in one second");
/*
* If the queue is full, first make sure to discard any further
* flush request from the engine. This means 'the caller will
* issue a retry at a later time'.
*/
ctx->blocked = FLB_TRUE;
/*
* Next step is to give it some time to the background rdkafka
* library to do it own work. By default rdkafka wait 1 second
* or up to 10000 messages to be enqueued before delivery.
*
* If the kafka broker is down we should try a couple of times
* to enqueue this message, if we exceed 10 times, we just
* issue a full retry of the data chunk.
*/
flb_time_sleep(1000);
rd_kafka_poll(ctx->kafka.rk, 0);
/* Issue a re-try */
queue_full_retries++;
goto retry;
}
}
else {
flb_plg_debug(ctx->ins, "enqueued message (%zd bytes) for topic '%s'",
out_size, rd_kafka_topic_name(topic->tp));
}
ctx->blocked = FLB_FALSE;
rd_kafka_poll(ctx->kafka.rk, 0);
if (ctx->format == FLB_KAFKA_FMT_JSON) {
flb_sds_destroy(s);
}
if (ctx->format == FLB_KAFKA_FMT_GELF) {
flb_sds_destroy(s);
}
#ifdef FLB_HAVE_AVRO_ENCODER
if (ctx->format == FLB_KAFKA_FMT_AVRO) {
AVRO_FREE(avro_fast_buffer, out_buf)
}
#endif
msgpack_sbuffer_destroy(&mp_sbuf);
return FLB_OK;
}
static void cb_kafka_flush(struct flb_event_chunk *event_chunk,
struct flb_output_flush *out_flush,
struct flb_input_instance *i_ins,
void *out_context,
struct flb_config *config)
{
int ret;
struct flb_out_kafka *ctx = out_context;
struct flb_log_event_decoder log_decoder;
struct flb_log_event log_event;
/*
* If the context is blocked, means rdkafka queue is full and no more
* messages can be appended. For our called (Fluent Bit engine) means
* that is not possible to work on this now and it need to 'retry'.
*/
if (ctx->blocked == FLB_TRUE) {
FLB_OUTPUT_RETURN(FLB_RETRY);
}
ret = flb_log_event_decoder_init(&log_decoder,
(char *) event_chunk->data,
event_chunk->size);
if (ret != FLB_EVENT_DECODER_SUCCESS) {
flb_plg_error(ctx->ins,
"Log event decoder initialization error : %d", ret);
FLB_OUTPUT_RETURN(FLB_RETRY);
}
/* Iterate the original buffer and perform adjustments */
while ((ret = flb_log_event_decoder_next(
&log_decoder,
&log_event)) == FLB_EVENT_DECODER_SUCCESS) {
ret = produce_message(&log_event.timestamp,
log_event.body,
ctx, config);
if (ret != FLB_OK) {
flb_log_event_decoder_destroy(&log_decoder);
FLB_OUTPUT_RETURN(ret);
}
}
flb_log_event_decoder_destroy(&log_decoder);
FLB_OUTPUT_RETURN(FLB_OK);
}
static void kafka_flush_force(struct flb_out_kafka *ctx,
struct flb_config *config)
{
int ret;
if (!ctx) {
return;
}
if (ctx->kafka.rk) {
ret = rd_kafka_flush(ctx->kafka.rk, config->grace * 1000);
if (ret != RD_KAFKA_RESP_ERR_NO_ERROR) {
flb_plg_warn(ctx->ins, "Failed to force flush: %s",
rd_kafka_err2str(ret));
}
}
}
static int cb_kafka_exit(void *data, struct flb_config *config)
{
struct flb_out_kafka *ctx = data;
kafka_flush_force(ctx, config);
flb_out_kafka_destroy(ctx);
return 0;
}
static struct flb_config_map config_map[] = {
{
FLB_CONFIG_MAP_STR, "topic_key", (char *)NULL,
0, FLB_TRUE, offsetof(struct flb_out_kafka, topic_key),
"Which record to use as the kafka topic."
},
{
FLB_CONFIG_MAP_BOOL, "dynamic_topic", "false",
0, FLB_TRUE, offsetof(struct flb_out_kafka, dynamic_topic),
"Activate dynamic topics."
},
{
FLB_CONFIG_MAP_STR, "format", (char *)NULL,
0, FLB_TRUE, offsetof(struct flb_out_kafka, format_str),
"Set the record output format."
},
{
FLB_CONFIG_MAP_STR, "message_key", (char *)NULL,
0, FLB_TRUE, offsetof(struct flb_out_kafka, message_key),
"Which record key to use as the message data."
},
{
FLB_CONFIG_MAP_STR, "message_key_field", (char *)NULL,
0, FLB_TRUE, offsetof(struct flb_out_kafka, message_key_field),
"Which record key field to use as the message data."
},
{
FLB_CONFIG_MAP_STR, "timestamp_key", FLB_KAFKA_TS_KEY,
0, FLB_TRUE, offsetof(struct flb_out_kafka, timestamp_key),
"Set the key for the the timestamp."
},
{
FLB_CONFIG_MAP_STR, "timestamp_format", (char *)NULL,
0, FLB_TRUE, offsetof(struct flb_out_kafka, timestamp_format_str),
"Set the format the timestamp is in."
},
{
FLB_CONFIG_MAP_INT, "queue_full_retries", FLB_KAFKA_QUEUE_FULL_RETRIES,
0, FLB_TRUE, offsetof(struct flb_out_kafka, queue_full_retries),
"Set the number of local retries to enqueue the data."
},
{
FLB_CONFIG_MAP_STR, "gelf_timestamp_key", (char *)NULL,
0, FLB_FALSE, 0,
"Set the timestamp key for gelf output."
},
{
FLB_CONFIG_MAP_STR, "gelf_host_key", (char *)NULL,
0, FLB_FALSE, 0,
"Set the host key for gelf output."
},
{
FLB_CONFIG_MAP_STR, "gelf_short_message_key", (char *)NULL,
0, FLB_FALSE, 0,
"Set the short message key for gelf output."
},
{
FLB_CONFIG_MAP_STR, "gelf_full_message_key", (char *)NULL,
0, FLB_FALSE, 0,
"Set the full message key for gelf output."
},
{
FLB_CONFIG_MAP_STR, "gelf_level_key", (char *)NULL,
0, FLB_FALSE, 0,
"Set the level key for gelf output."
},
#ifdef FLB_HAVE_AVRO_ENCODER
{
FLB_CONFIG_MAP_STR, "schema_str", (char *)NULL,
0, FLB_FALSE, 0,
"Set AVRO schema."
},
{
FLB_CONFIG_MAP_STR, "schema_id", (char *)NULL,
0, FLB_FALSE, 0,
"Set AVRO schema ID."
},
#endif
{
FLB_CONFIG_MAP_STR, "topics", (char *)NULL,
0, FLB_FALSE, 0,
"Set the kafka topics, delimited by commas."
},
{
FLB_CONFIG_MAP_STR, "brokers", (char *)NULL,
0, FLB_FALSE, 0,
"Set the kafka brokers, delimited by commas."
},
{
FLB_CONFIG_MAP_STR, "client_id", (char *)NULL,
0, FLB_FALSE, 0,
"Set the kafka client_id."
},
{
FLB_CONFIG_MAP_STR, "group_id", (char *)NULL,
0, FLB_FALSE, 0,
"Set the kafka group_id."
},
{
FLB_CONFIG_MAP_STR_PREFIX, "rdkafka.", NULL,
//FLB_CONFIG_MAP_MULT, FLB_TRUE, offsetof(struct flb_out_kafka, rdkafka_opts),
0, FLB_FALSE, 0,
"Set the kafka group_id."
},
/* EOF */
{0}
};
struct flb_output_plugin out_kafka_plugin = {
.name = "kafka",
.description = "Kafka",
.cb_init = cb_kafka_init,
.cb_flush = cb_kafka_flush,
.cb_exit = cb_kafka_exit,
.config_map = config_map,
.flags = 0
};
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