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/*
* librdkafka - Apache Kafka C library
*
* Copyright (c) 2020, 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.
*/
/**
* Example utility that shows how to use DeleteRecords (AdminAPI)
* do delete all messages/records up to (but not including) a specific offset
* from one or more topic partitions.
*/
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
/* Typical include path would be <librdkafka/rdkafka.h>, but this program
* is builtin from within the librdkafka source tree and thus differs. */
#include "rdkafka.h"
static rd_kafka_queue_t *queue; /** Admin result queue.
* This is a global so we can
* yield in stop() */
static volatile sig_atomic_t run = 1;
/**
* @brief Signal termination of program
*/
static void stop(int sig) {
if (!run) {
fprintf(stderr, "%% Forced termination\n");
exit(2);
}
run = 0;
rd_kafka_queue_yield(queue);
}
/**
* @brief Parse an integer or fail.
*/
int64_t parse_int(const char *what, const char *str) {
char *end;
unsigned long n = strtoull(str, &end, 0);
if (end != str + strlen(str)) {
fprintf(stderr, "%% Invalid input for %s: %s: not an integer\n",
what, str);
exit(1);
}
return (int64_t)n;
}
int main(int argc, char **argv) {
rd_kafka_conf_t *conf; /* Temporary configuration object */
char errstr[512]; /* librdkafka API error reporting buffer */
const char *brokers; /* Argument: broker list */
rd_kafka_t *rk; /* Admin client instance */
rd_kafka_topic_partition_list_t *offsets_before; /* Delete messages up
* to but not
* including these
* offsets */
rd_kafka_DeleteRecords_t *del_records; /* Container for offsets_before*/
rd_kafka_AdminOptions_t *options; /* (Optional) Options for
* DeleteRecords() */
rd_kafka_event_t *event; /* DeleteRecords result event */
int exitcode = 0;
int i;
/*
* Argument validation
*/
if (argc < 5 || (argc - 2) % 3 != 0) {
fprintf(stderr,
"%% Usage: %s <broker> "
"<topic> <partition> <offset_before> "
"<topic2> <partition2> <offset_before2> ...\n"
"\n"
"Delete all messages up to but not including the "
"specified offset(s).\n"
"\n",
argv[0]);
return 1;
}
brokers = argv[1];
/* Parse topic partition offset tuples and add to offsets list */
offsets_before = rd_kafka_topic_partition_list_new((argc - 2) / 3);
for (i = 2; i < argc; i += 3) {
const char *topic = argv[i];
int partition = parse_int("partition", argv[i + 1]);
int64_t offset = parse_int("offset_before", argv[i + 2]);
rd_kafka_topic_partition_list_add(offsets_before, topic,
partition)
->offset = offset;
}
/*
* Create Kafka client configuration place-holder
*/
conf = rd_kafka_conf_new();
/* Set bootstrap broker(s) as a comma-separated list of
* host or host:port (default port 9092).
* librdkafka will use the bootstrap brokers to acquire the full
* set of brokers from the cluster. */
if (rd_kafka_conf_set(conf, "bootstrap.servers", brokers, errstr,
sizeof(errstr)) != RD_KAFKA_CONF_OK) {
fprintf(stderr, "%s\n", errstr);
return 1;
}
rd_kafka_conf_set(conf, "debug", "admin,topic,metadata", NULL, 0);
/*
* Create an admin client, it can be created using any client type,
* so we choose producer since it requires no extra configuration
* and is more light-weight than the consumer.
*
* NOTE: rd_kafka_new() takes ownership of the conf object
* and the application must not reference it again after
* this call.
*/
rk = rd_kafka_new(RD_KAFKA_PRODUCER, conf, errstr, sizeof(errstr));
if (!rk) {
fprintf(stderr, "%% Failed to create new producer: %s\n",
errstr);
return 1;
}
/* The Admin API is completely asynchronous, results are emitted
* on the result queue that is passed to DeleteRecords() */
queue = rd_kafka_queue_new(rk);
/* Signal handler for clean shutdown */
signal(SIGINT, stop);
/* Set timeout (optional) */
options =
rd_kafka_AdminOptions_new(rk, RD_KAFKA_ADMIN_OP_DELETERECORDS);
if (rd_kafka_AdminOptions_set_request_timeout(
options, 30 * 1000 /* 30s */, errstr, sizeof(errstr))) {
fprintf(stderr, "%% Failed to set timeout: %s\n", errstr);
return 1;
}
/* Create argument */
del_records = rd_kafka_DeleteRecords_new(offsets_before);
/* We're now done with offsets_before */
rd_kafka_topic_partition_list_destroy(offsets_before);
/* Call DeleteRecords */
rd_kafka_DeleteRecords(rk, &del_records, 1, options, queue);
/* Clean up input arguments */
rd_kafka_DeleteRecords_destroy(del_records);
rd_kafka_AdminOptions_destroy(options);
/* Wait for results */
event = rd_kafka_queue_poll(queue, -1 /*indefinitely*/);
if (!event) {
/* User hit Ctrl-C */
fprintf(stderr, "%% Cancelled by user\n");
} else if (rd_kafka_event_error(event)) {
/* DeleteRecords request failed */
fprintf(stderr, "%% DeleteRecords failed: %s\n",
rd_kafka_event_error_string(event));
exitcode = 2;
} else {
/* DeleteRecords request succeeded, but individual
* partitions may have errors. */
const rd_kafka_DeleteRecords_result_t *result;
const rd_kafka_topic_partition_list_t *offsets;
int i;
result = rd_kafka_event_DeleteRecords_result(event);
offsets = rd_kafka_DeleteRecords_result_offsets(result);
printf("DeleteRecords results:\n");
for (i = 0; i < offsets->cnt; i++)
printf(" %s [%" PRId32 "] offset %" PRId64 ": %s\n",
offsets->elems[i].topic,
offsets->elems[i].partition,
offsets->elems[i].offset,
rd_kafka_err2str(offsets->elems[i].err));
}
/* Destroy event object when we're done with it.
* Note: rd_kafka_event_destroy() allows a NULL event. */
rd_kafka_event_destroy(event);
signal(SIGINT, SIG_DFL);
/* Destroy queue */
rd_kafka_queue_destroy(queue);
/* Destroy the producer instance */
rd_kafka_destroy(rk);
return exitcode;
}
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