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/*
* librdkafka - Apache Kafka C library
*
* Copyright (c) 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.
*/
/**
* A collection of smaller usage examples
*/
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#ifdef _WIN32
#include "../win32/wingetopt.h"
#else
#include <getopt.h>
#endif
/* 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"
const char *argv0;
static void usage(const char *reason, ...) {
fprintf(stderr,
"Miscellaneous librdkafka usage examples\n"
"\n"
"Usage: %s <options> <command> [<command arguments>]\n"
"\n"
"Commands:\n"
" List groups:\n"
" %s -b <brokers> list_groups <group>\n"
"\n"
" Show librdkafka version:\n"
" %s version\n"
"\n"
"Common options for all commands:\n"
" -b <brokers> Bootstrap server list to connect to.\n"
" -X <prop=val> Set librdkafka configuration property.\n"
" See CONFIGURATION.md for full list.\n"
" -d <dbg,..> Enable librdkafka debugging (%s).\n"
"\n",
argv0, argv0, argv0, rd_kafka_get_debug_contexts());
if (reason) {
va_list ap;
char reasonbuf[512];
va_start(ap, reason);
vsnprintf(reasonbuf, sizeof(reasonbuf), reason, ap);
va_end(ap);
fprintf(stderr, "ERROR: %s\n", reasonbuf);
}
exit(reason ? 1 : 0);
}
#define fatal(...) \
do { \
fprintf(stderr, "ERROR: "); \
fprintf(stderr, __VA_ARGS__); \
fprintf(stderr, "\n"); \
exit(2); \
} while (0)
/**
* @brief Set config property. Exit on failure.
*/
static void conf_set(rd_kafka_conf_t *conf, const char *name, const char *val) {
char errstr[512];
if (rd_kafka_conf_set(conf, name, val, errstr, sizeof(errstr)) !=
RD_KAFKA_CONF_OK)
fatal("Failed to set %s=%s: %s", name, val, errstr);
}
/**
* Commands
*
*/
/**
* @brief Just print the librdkafka version
*/
static void cmd_version(rd_kafka_conf_t *conf, int argc, char **argv) {
if (argc)
usage("version command takes no arguments");
printf("librdkafka v%s\n", rd_kafka_version_str());
rd_kafka_conf_destroy(conf);
}
/**
* @brief Call rd_kafka_list_groups() with an optional groupid argument.
*/
static void cmd_list_groups(rd_kafka_conf_t *conf, int argc, char **argv) {
rd_kafka_t *rk;
const char *groupid = NULL;
char errstr[512];
rd_kafka_resp_err_t err;
const struct rd_kafka_group_list *grplist;
int i;
int retval = 0;
if (argc > 1)
usage("too many arguments to list_groups");
if (argc == 1)
groupid = argv[0];
/*
* Create consumer instance
* 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_CONSUMER, conf, errstr, sizeof(errstr));
if (!rk)
fatal("Failed to create new consumer: %s", errstr);
/*
* List groups
*/
err = rd_kafka_list_groups(rk, groupid, &grplist, 10 * 1000 /*10s*/);
if (err)
fatal("rd_kafka_list_groups(%s) failed: %s", groupid,
rd_kafka_err2str(err));
if (grplist->group_cnt == 0) {
if (groupid) {
fprintf(stderr, "Group %s not found\n", groupid);
retval = 1;
} else {
fprintf(stderr, "No groups in cluster\n");
}
}
/*
* Print group information
*/
for (i = 0; i < grplist->group_cnt; i++) {
int j;
const struct rd_kafka_group_info *grp = &grplist->groups[i];
printf(
"Group \"%s\" protocol-type %s, protocol %s, "
"state %s, with %d member(s))",
grp->group, grp->protocol_type, grp->protocol, grp->state,
grp->member_cnt);
if (grp->err)
printf(" error: %s", rd_kafka_err2str(grp->err));
printf("\n");
for (j = 0; j < grp->member_cnt; j++) {
const struct rd_kafka_group_member_info *mb =
&grp->members[j];
printf(
" Member \"%s\" with client-id %s, host %s, "
"%d bytes of metadat, %d bytes of assignment\n",
mb->member_id, mb->client_id, mb->client_host,
mb->member_metadata_size,
mb->member_assignment_size);
}
}
rd_kafka_group_list_destroy(grplist);
/* Destroy the client instance */
rd_kafka_destroy(rk);
exit(retval);
}
int main(int argc, char **argv) {
rd_kafka_conf_t *conf; /**< Client configuration object */
int opt, i;
const char *cmd;
static const struct {
const char *cmd;
void (*func)(rd_kafka_conf_t *conf, int argc, char **argv);
} cmds[] = {
{"version", cmd_version},
{"list_groups", cmd_list_groups},
{NULL},
};
argv0 = argv[0];
if (argc == 1)
usage(NULL);
/*
* Create Kafka client configuration place-holder
*/
conf = rd_kafka_conf_new();
/*
* Parse common options
*/
while ((opt = getopt(argc, argv, "b:X:d:")) != -1) {
switch (opt) {
case 'b':
conf_set(conf, "bootstrap.servers", optarg);
break;
case 'X': {
char *name = optarg, *val;
if (!(val = strchr(name, '=')))
fatal("-X expects a name=value argument");
*val = '\0';
val++;
conf_set(conf, name, val);
break;
}
case 'd':
conf_set(conf, "debug", optarg);
break;
default:
usage("Unknown option %c", (char)opt);
}
}
if (optind == argc)
usage("No command specified");
cmd = argv[optind++];
/*
* Find matching command and run it
*/
for (i = 0; cmds[i].cmd; i++) {
if (!strcmp(cmds[i].cmd, cmd)) {
cmds[i].func(conf, argc - optind, &argv[optind]);
exit(0);
}
}
usage("Unknown command: %s", cmd);
/* NOTREACHED */
return 0;
}
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