/*
* librdkafka - Apache Kafka C library
*
* Copyright (c) 2012, 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.
*/
/**
* Apache Kafka consumer & producer example programs
* using the Kafka driver from librdkafka
* (https://github.com/edenhill/librdkafka)
*/
#include <ctype.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <syslog.h>
#include <time.h>
#include <sys/time.h>
#include <getopt.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" /* for Kafka driver */
static int run = 1;
static rd_kafka_t *rk;
static int exit_eof = 0;
static int quiet = 0;
static enum {
OUTPUT_HEXDUMP,
OUTPUT_RAW,
} output = OUTPUT_HEXDUMP;
static void stop (int sig) {
run = 0;
fclose(stdin); /* abort fgets() */
}
static void hexdump (FILE *fp, const char *name, const void *ptr, size_t len) {
const char *p = (const char *)ptr;
size_t of = 0;
if (name)
fprintf(fp, "%s hexdump (%zd bytes):\n", name, len);
for (of = 0 ; of < len ; of += 16) {
char hexen[16*3+1];
char charen[16+1];
int hof = 0;
int cof = 0;
int i;
for (i = of ; i < (int)of + 16 && i < (int)len ; i++) {
hof += sprintf(hexen+hof, "%02x ", p[i] & 0xff);
cof += sprintf(charen+cof, "%c",
isprint((int)p[i]) ? p[i] : '.');
}
fprintf(fp, "%08zx: %-48s %-16s\n",
of, hexen, charen);
}
}
/**
* Kafka logger callback (optional)
*/
static void logger (const rd_kafka_t *rk, int level,
const char *fac, const char *buf) {
struct timeval tv;
gettimeofday(&tv, NULL);
fprintf(stderr, "%u.%03u RDKAFKA-%i-%s: %s: %s\n",
(int)tv.tv_sec, (int)(tv.tv_usec / 1000),
level, fac, rk ? rd_kafka_name(rk) : NULL, buf);
}
/**
* Message delivery report callback.
* Called once for each message.
* See rdkafka.h for more information.
*/
static void msg_delivered (rd_kafka_t *rk,
void *payload, size_t len,
int error_code,
void *opaque, void *msg_opaque) {
if (error_code)
fprintf(stderr, "%% Message delivery failed: %s\n",
rd_kafka_err2str(error_code));
else if (!quiet)
fprintf(stderr, "%% Message delivered (%zd bytes): %.*s\n", len,
(int)len, (const char *)payload);
}
/**
* Message delivery report callback using the richer rd_kafka_message_t object.
*/
static void msg_delivered2 (rd_kafka_t *rk,
const rd_kafka_message_t *rkmessage, void *opaque) {
printf("del: %s: offset %"PRId64"\n",
rd_kafka_err2str(rkmessage->err), rkmessage->offset);
if (rkmessage->err)
fprintf(stderr, "%% Message delivery failed: %s\n",
rd_kafka_err2str(rkmessage->err));
else if (!quiet)
fprintf(stderr,
"%% Message delivered (%zd bytes, offset %"PRId64", "
"partition %"PRId32"): %.*s\n",
rkmessage->len, rkmessage->offset,
rkmessage->partition,
(int)rkmessage->len, (const char *)rkmessage->payload);
}
static void msg_consume (rd_kafka_message_t *rkmessage,
void *opaque) {
if (rkmessage->err) {
if (rkmessage->err == RD_KAFKA_RESP_ERR__PARTITION_EOF) {
fprintf(stderr,
"%% Consumer reached end of %s [%"PRId32"] "
"message queue at offset %"PRId64"\n",
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition, rkmessage->offset);
if (exit_eof)
run = 0;
return;
}
fprintf(stderr, "%% Consume error for topic \"%s\" [%"PRId32"] "
"offset %"PRId64": %s\n",
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition,
rkmessage->offset,
rd_kafka_message_errstr(rkmessage));
if (rkmessage->err == RD_KAFKA_RESP_ERR__UNKNOWN_PARTITION ||
rkmessage->err == RD_KAFKA_RESP_ERR__UNKNOWN_TOPIC)
run = 0;
return;
}
if (!quiet) {
rd_kafka_timestamp_type_t tstype;
int64_t timestamp;
rd_kafka_headers_t *hdrs;
fprintf(stdout, "%% Message (offset %"PRId64", %zd bytes):\n",
rkmessage->offset, rkmessage->len);
timestamp = rd_kafka_message_timestamp(rkmessage, &tstype);
if (tstype != RD_KAFKA_TIMESTAMP_NOT_AVAILABLE) {
const char *tsname = "?";
if (tstype == RD_KAFKA_TIMESTAMP_CREATE_TIME)
tsname = "create time";
else if (tstype == RD_KAFKA_TIMESTAMP_LOG_APPEND_TIME)
tsname = "log append time";
fprintf(stdout, "%% Message timestamp: %s %"PRId64
" (%ds ago)\n",
tsname, timestamp,
!timestamp ? 0 :
(int)time(NULL) - (int)(timestamp/1000));
}
if (!rd_kafka_message_headers(rkmessage, &hdrs)) {
size_t idx = 0;
const char *name;
const void *val;
size_t size;
fprintf(stdout, "%% Headers:");
while (!rd_kafka_header_get_all(hdrs, idx++,
&name, &val, &size)) {
fprintf(stdout, "%s%s=",
idx == 1 ? " " : ", ", name);
if (val)
fprintf(stdout, "\"%.*s\"",
(int)size, (const char *)val);
else
fprintf(stdout, "NULL");
}
fprintf(stdout, "\n");
}
}
if (rkmessage->key_len) {
if (output == OUTPUT_HEXDUMP)
hexdump(stdout, "Message Key",
rkmessage->key, rkmessage->key_len);
else
printf("Key: %.*s\n",
(int)rkmessage->key_len, (char *)rkmessage->key);
}
if (output == OUTPUT_HEXDUMP)
hexdump(stdout, "Message Payload",
rkmessage->payload, rkmessage->len);
else
printf("%.*s\n",
(int)rkmessage->len, (char *)rkmessage->payload);
}
static void metadata_print (const char *topic,
const struct rd_kafka_metadata *metadata) {
int i, j, k;
printf("Metadata for %s (from broker %"PRId32": %s):\n",
topic ? : "all topics",
metadata->orig_broker_id,
metadata->orig_broker_name);
/* Iterate brokers */
printf(" %i brokers:\n", metadata->broker_cnt);
for (i = 0 ; i < metadata->broker_cnt ; i++)
printf(" broker %"PRId32" at %s:%i\n",
metadata->brokers[i].id,
metadata->brokers[i].host,
metadata->brokers[i].port);
/* Iterate topics */
printf(" %i topics:\n", metadata->topic_cnt);
for (i = 0 ; i < metadata->topic_cnt ; i++) {
const struct rd_kafka_metadata_topic *t = &metadata->topics[i];
printf(" topic \"%s\" with %i partitions:",
t->topic,
t->partition_cnt);
if (t->err) {
printf(" %s", rd_kafka_err2str(t->err));
if (t->err == RD_KAFKA_RESP_ERR_LEADER_NOT_AVAILABLE)
printf(" (try again)");
}
printf("\n");
/* Iterate topic's partitions */
for (j = 0 ; j < t->partition_cnt ; j++) {
const struct rd_kafka_metadata_partition *p;
p = &t->partitions[j];
printf(" partition %"PRId32", "
"leader %"PRId32", replicas: ",
p->id, p->leader);
/* Iterate partition's replicas */
for (k = 0 ; k < p->replica_cnt ; k++)
printf("%s%"PRId32,
k > 0 ? ",":"", p->replicas[k]);
/* Iterate partition's ISRs */
printf(", isrs: ");
for (k = 0 ; k < p->isr_cnt ; k++)
printf("%s%"PRId32,
k > 0 ? ",":"", p->isrs[k]);
if (p->err)
printf(", %s\n", rd_kafka_err2str(p->err));
else
printf("\n");
}
}
}
static void sig_usr1 (int sig) {
rd_kafka_dump(stdout, rk);
}
int main (int argc, char **argv) {
rd_kafka_topic_t *rkt;
char *brokers = "localhost:9092";
char mode = 'C';
char *topic = NULL;
int partition = RD_KAFKA_PARTITION_UA;
int opt;
rd_kafka_conf_t *conf;
rd_kafka_topic_conf_t *topic_conf;
char errstr[512];
int64_t start_offset = 0;
int report_offsets = 0;
int do_conf_dump = 0;
char tmp[16];
int64_t seek_offset = 0;
int64_t tmp_offset = 0;
int get_wmarks = 0;
rd_kafka_headers_t *hdrs = NULL;
rd_kafka_resp_err_t err;
/* Kafka configuration */
conf = rd_kafka_conf_new();
/* Set logger */
rd_kafka_conf_set_log_cb(conf, logger);
/* Quick termination */
snprintf(tmp, sizeof(tmp), "%i", SIGIO);
rd_kafka_conf_set(conf, "internal.termination.signal", tmp, NULL, 0);
/* Topic configuration */
topic_conf = rd_kafka_topic_conf_new();
while ((opt = getopt(argc, argv, "PCLt:p:b:z:qd:o:eX:As:H:")) != -1) {
switch (opt) {
case 'P':
case 'C':
case 'L':
mode = opt;
break;
case 't':
topic = optarg;
break;
case 'p':
partition = atoi(optarg);
break;
case 'b':
brokers = optarg;
break;
case 'z':
if (rd_kafka_conf_set(conf, "compression.codec",
optarg,
errstr, sizeof(errstr)) !=
RD_KAFKA_CONF_OK) {
fprintf(stderr, "%% %s\n", errstr);
exit(1);
}
break;
case 'o':
case 's':
if (!strcmp(optarg, "end"))
tmp_offset = RD_KAFKA_OFFSET_END;
else if (!strcmp(optarg, "beginning"))
tmp_offset = RD_KAFKA_OFFSET_BEGINNING;
else if (!strcmp(optarg, "stored"))
tmp_offset = RD_KAFKA_OFFSET_STORED;
else if (!strcmp(optarg, "report"))
report_offsets = 1;
else if (!strcmp(optarg, "wmark"))
get_wmarks = 1;
else {
tmp_offset = strtoll(optarg, NULL, 10);
if (tmp_offset < 0)
tmp_offset = RD_KAFKA_OFFSET_TAIL(-tmp_offset);
}
if (opt == 'o')
start_offset = tmp_offset;
else if (opt == 's')
seek_offset = tmp_offset;
break;
case 'e':
exit_eof = 1;
break;
case 'd':
if (rd_kafka_conf_set(conf, "debug", optarg,
errstr, sizeof(errstr)) !=
RD_KAFKA_CONF_OK) {
fprintf(stderr,
"%% Debug configuration failed: "
"%s: %s\n",
errstr, optarg);
exit(1);
}
break;
case 'q':
quiet = 1;
break;
case 'A':
output = OUTPUT_RAW;
break;
case 'H':
{
char *name, *val;
size_t name_sz = -1;
name = optarg;
val = strchr(name, '=');
if (val) {
name_sz = (size_t)(val-name);
val++; /* past the '=' */
}
if (!hdrs)
hdrs = rd_kafka_headers_new(8);
err = rd_kafka_header_add(hdrs, name, name_sz, val, -1);
if (err) {
fprintf(stderr,
"%% Failed to add header %s: %s\n",
name, rd_kafka_err2str(err));
exit(1);
}
}
break;
case 'X':
{
char *name, *val;
rd_kafka_conf_res_t res;
if (!strcmp(optarg, "list") ||
!strcmp(optarg, "help")) {
rd_kafka_conf_properties_show(stdout);
exit(0);
}
if (!strcmp(optarg, "dump")) {
do_conf_dump = 1;
continue;
}
name = optarg;
if (!(val = strchr(name, '='))) {
char dest[512];
size_t dest_size = sizeof(dest);
/* Return current value for property. */
res = RD_KAFKA_CONF_UNKNOWN;
if (!strncmp(name, "topic.", strlen("topic.")))
res = rd_kafka_topic_conf_get(
topic_conf,
name+strlen("topic."),
dest, &dest_size);
if (res == RD_KAFKA_CONF_UNKNOWN)
res = rd_kafka_conf_get(
conf, name, dest, &dest_size);
if (res == RD_KAFKA_CONF_OK) {
printf("%s = %s\n", name, dest);
exit(0);
} else {
fprintf(stderr,
"%% %s property\n",
res == RD_KAFKA_CONF_UNKNOWN ?
"Unknown" : "Invalid");
exit(1);
}
}
*val = '\0';
val++;
res = RD_KAFKA_CONF_UNKNOWN;
/* Try "topic." prefixed properties on topic
* conf first, and then fall through to global if
* it didnt match a topic configuration property. */
if (!strncmp(name, "topic.", strlen("topic.")))
res = rd_kafka_topic_conf_set(topic_conf,
name+
strlen("topic."),
val,
errstr,
sizeof(errstr));
if (res == RD_KAFKA_CONF_UNKNOWN)
res = rd_kafka_conf_set(conf, name, val,
errstr, sizeof(errstr));
if (res != RD_KAFKA_CONF_OK) {
fprintf(stderr, "%% %s\n", errstr);
exit(1);
}
}
break;
default:
goto usage;
}
}
if (do_conf_dump) {
const char **arr;
size_t cnt;
int pass;
for (pass = 0 ; pass < 2 ; pass++) {
int i;
if (pass == 0) {
arr = rd_kafka_conf_dump(conf, &cnt);
printf("# Global config\n");
} else {
printf("# Topic config\n");
arr = rd_kafka_topic_conf_dump(topic_conf,
&cnt);
}
for (i = 0 ; i < (int)cnt ; i += 2)
printf("%s = %s\n",
arr[i], arr[i+1]);
printf("\n");
rd_kafka_conf_dump_free(arr, cnt);
}
exit(0);
}
if (optind != argc || (mode != 'L' && !topic)) {
usage:
fprintf(stderr,
"Usage: %s -C|-P|-L -t <topic> "
"[-p <partition>] [-b <host1:port1,host2:port2,..>]\n"
"\n"
"librdkafka version %s (0x%08x)\n"
"\n"
" Options:\n"
" -C | -P Consumer or Producer mode\n"
" -L Metadata list mode\n"
" -t <topic> Topic to fetch / produce\n"
" -p <num> Partition (random partitioner)\n"
" -b <brokers> Broker address (localhost:9092)\n"
" -z <codec> Enable compression:\n"
" none|gzip|snappy\n"
" -o <offset> Start offset (consumer):\n"
" beginning, end, NNNNN or -NNNNN\n"
" wmark returns the current hi&lo "
"watermarks.\n"
" -o report Report message offsets (producer)\n"
" -e Exit consumer when last message\n"
" in partition has been received.\n"
" -d [facs..] Enable debugging contexts:\n"
" %s\n"
" -q Be quiet\n"
" -A Raw payload output (consumer)\n"
" -H <name[=value]> Add header to message (producer)\n"
" -X <prop=name> Set arbitrary librdkafka "
"configuration property\n"
" Properties prefixed with \"topic.\" "
"will be set on topic object.\n"
" -X list Show full list of supported "
"properties.\n"
" -X <prop> Get single property value\n"
"\n"
" In Consumer mode:\n"
" writes fetched messages to stdout\n"
" In Producer mode:\n"
" reads messages from stdin and sends to broker\n"
" In List mode:\n"
" queries broker for metadata information, "
"topic is optional.\n"
"\n"
"\n"
"\n",
argv[0],
rd_kafka_version_str(), rd_kafka_version(),
RD_KAFKA_DEBUG_CONTEXTS);
exit(1);
}
if ((mode == 'C' && !isatty(STDIN_FILENO)) ||
(mode != 'C' && !isatty(STDOUT_FILENO)))
quiet = 1;
signal(SIGINT, stop);
signal(SIGUSR1, sig_usr1);
if (mode == 'P') {
/*
* Producer
*/
char buf[2048];
int sendcnt = 0;
/* Set up a message delivery report callback.
* It will be called once for each message, either on successful
* delivery to broker, or upon failure to deliver to broker. */
/* If offset reporting (-o report) is enabled, use the
* richer dr_msg_cb instead. */
if (report_offsets) {
rd_kafka_topic_conf_set(topic_conf,
"produce.offset.report",
"true", errstr, sizeof(errstr));
rd_kafka_conf_set_dr_msg_cb(conf, msg_delivered2);
} else
rd_kafka_conf_set_dr_cb(conf, msg_delivered);
/* Create Kafka handle */
if (!(rk = rd_kafka_new(RD_KAFKA_PRODUCER, conf,
errstr, sizeof(errstr)))) {
fprintf(stderr,
"%% Failed to create new producer: %s\n",
errstr);
exit(1);
}
/* Add brokers */
if (rd_kafka_brokers_add(rk, brokers) == 0) {
fprintf(stderr, "%% No valid brokers specified\n");
exit(1);
}
/* Create topic */
rkt = rd_kafka_topic_new(rk, topic, topic_conf);
topic_conf = NULL; /* Now owned by topic */
if (!quiet)
fprintf(stderr,
"%% Type stuff and hit enter to send\n");
while (run && fgets(buf, sizeof(buf), stdin)) {
size_t len = strlen(buf);
if (buf[len-1] == '\n')
buf[--len] = '\0';
/* Send/Produce message. */
if (hdrs) {
rd_kafka_headers_t *hdrs_copy;
hdrs_copy = rd_kafka_headers_copy(hdrs);
err = rd_kafka_producev(
rk,
RD_KAFKA_V_RKT(rkt),
RD_KAFKA_V_PARTITION(partition),
RD_KAFKA_V_MSGFLAGS(RD_KAFKA_MSG_F_COPY),
RD_KAFKA_V_VALUE(buf, len),
RD_KAFKA_V_HEADERS(hdrs_copy),
RD_KAFKA_V_END);
if (err)
rd_kafka_headers_destroy(hdrs_copy);
} else {
if (rd_kafka_produce(
rkt, partition,
RD_KAFKA_MSG_F_COPY,
/* Payload and length */
buf, len,
/* Optional key and its length */
NULL, 0,
/* Message opaque, provided in
* delivery report callback as
* msg_opaque. */
NULL) == -1) {
err = rd_kafka_last_error();
}
}
if (err) {
fprintf(stderr,
"%% Failed to produce to topic %s "
"partition %i: %s\n",
rd_kafka_topic_name(rkt), partition,
rd_kafka_err2str(err));
/* Poll to handle delivery reports */
rd_kafka_poll(rk, 0);
continue;
}
if (!quiet)
fprintf(stderr, "%% Sent %zd bytes to topic "
"%s partition %i\n",
len, rd_kafka_topic_name(rkt), partition);
sendcnt++;
/* Poll to handle delivery reports */
rd_kafka_poll(rk, 0);
}
/* Poll to handle delivery reports */
rd_kafka_poll(rk, 0);
/* Wait for messages to be delivered */
while (run && rd_kafka_outq_len(rk) > 0)
rd_kafka_poll(rk, 100);
/* Destroy topic */
rd_kafka_topic_destroy(rkt);
/* Destroy the handle */
rd_kafka_destroy(rk);
} else if (mode == 'C') {
/*
* Consumer
*/
/* Create Kafka handle */
if (!(rk = rd_kafka_new(RD_KAFKA_CONSUMER, conf,
errstr, sizeof(errstr)))) {
fprintf(stderr,
"%% Failed to create new consumer: %s\n",
errstr);
exit(1);
}
/* Add brokers */
if (rd_kafka_brokers_add(rk, brokers) == 0) {
fprintf(stderr, "%% No valid brokers specified\n");
exit(1);
}
if (get_wmarks) {
int64_t lo, hi;
rd_kafka_resp_err_t err;
/* Only query for hi&lo partition watermarks */
if ((err = rd_kafka_query_watermark_offsets(
rk, topic, partition, &lo, &hi, 5000))) {
fprintf(stderr, "%% query_watermark_offsets() "
"failed: %s\n",
rd_kafka_err2str(err));
exit(1);
}
printf("%s [%d]: low - high offsets: "
"%"PRId64" - %"PRId64"\n",
topic, partition, lo, hi);
rd_kafka_destroy(rk);
exit(0);
}
/* Create topic */
rkt = rd_kafka_topic_new(rk, topic, topic_conf);
topic_conf = NULL; /* Now owned by topic */
/* Start consuming */
if (rd_kafka_consume_start(rkt, partition, start_offset) == -1){
rd_kafka_resp_err_t err = rd_kafka_last_error();
fprintf(stderr, "%% Failed to start consuming: %s\n",
rd_kafka_err2str(err));
if (err == RD_KAFKA_RESP_ERR__INVALID_ARG)
fprintf(stderr,
"%% Broker based offset storage "
"requires a group.id, "
"add: -X group.id=yourGroup\n");
exit(1);
}
while (run) {
rd_kafka_message_t *rkmessage;
rd_kafka_resp_err_t err;
/* Poll for errors, etc. */
rd_kafka_poll(rk, 0);
/* Consume single message.
* See rdkafka_performance.c for high speed
* consuming of messages. */
rkmessage = rd_kafka_consume(rkt, partition, 1000);
if (!rkmessage) /* timeout */
continue;
msg_consume(rkmessage, NULL);
/* Return message to rdkafka */
rd_kafka_message_destroy(rkmessage);
if (seek_offset) {
err = rd_kafka_seek(rkt, partition, seek_offset,
2000);
if (err)
printf("Seek failed: %s\n",
rd_kafka_err2str(err));
else
printf("Seeked to %"PRId64"\n",
seek_offset);
seek_offset = 0;
}
}
/* Stop consuming */
rd_kafka_consume_stop(rkt, partition);
while (rd_kafka_outq_len(rk) > 0)
rd_kafka_poll(rk, 10);
/* Destroy topic */
rd_kafka_topic_destroy(rkt);
/* Destroy handle */
rd_kafka_destroy(rk);
} else if (mode == 'L') {
rd_kafka_resp_err_t err = RD_KAFKA_RESP_ERR_NO_ERROR;
/* Create Kafka handle */
if (!(rk = rd_kafka_new(RD_KAFKA_PRODUCER, conf,
errstr, sizeof(errstr)))) {
fprintf(stderr,
"%% Failed to create new producer: %s\n",
errstr);
exit(1);
}
/* Add brokers */
if (rd_kafka_brokers_add(rk, brokers) == 0) {
fprintf(stderr, "%% No valid brokers specified\n");
exit(1);
}
/* Create topic */
if (topic) {
rkt = rd_kafka_topic_new(rk, topic, topic_conf);
topic_conf = NULL; /* Now owned by topic */
} else
rkt = NULL;
while (run) {
const struct rd_kafka_metadata *metadata;
/* Fetch metadata */
err = rd_kafka_metadata(rk, rkt ? 0 : 1, rkt,
&metadata, 5000);
if (err != RD_KAFKA_RESP_ERR_NO_ERROR) {
fprintf(stderr,
"%% Failed to acquire metadata: %s\n",
rd_kafka_err2str(err));
run = 0;
break;
}
metadata_print(topic, metadata);
rd_kafka_metadata_destroy(metadata);
run = 0;
}
/* Destroy topic */
if (rkt)
rd_kafka_topic_destroy(rkt);
/* Destroy the handle */
rd_kafka_destroy(rk);
if (topic_conf)
rd_kafka_topic_conf_destroy(topic_conf);
/* Exit right away, dont wait for background cleanup, we haven't
* done anything important anyway. */
exit(err ? 2 : 0);
}
if (hdrs)
rd_kafka_headers_destroy(hdrs);
if (topic_conf)
rd_kafka_topic_conf_destroy(topic_conf);
/* Let background threads clean up and terminate cleanly. */
run = 5;
while (run-- > 0 && rd_kafka_wait_destroyed(1000) == -1)
printf("Waiting for librdkafka to decommission\n");
if (run <= 0)
rd_kafka_dump(stdout, rk);
return 0;
}