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kafkacat.c
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/*
* kafkacat - Apache Kafka consumer and producer
*
* Copyright (c) 2014, 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.
*/
#ifndef _MSC_VER
#include <unistd.h>
#include <syslog.h>
#include <sys/time.h>
#include <sys/mman.h>
#else
#pragma comment(lib, "ws2_32.lib")
#include "win32/wingetopt.h"
#include <io.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "kafkacat.h"
struct conf conf = {
.run = 1,
.verbosity = 1,
.exitonerror = 1,
.partition = RD_KAFKA_PARTITION_UA,
.msg_size = 1024*1024,
.null_str = "NULL",
.index_file = NULL,
};
static struct stats {
uint64_t tx;
uint64_t tx_err_q;
uint64_t tx_err_dr;
uint64_t tx_delivered;
uint64_t rx;
} stats;
/* Partition's at EOF state array */
int *part_eof = NULL;
/* Number of partitions that has reached EOF */
int part_eof_cnt = 0;
/* Threshold level (partitions at EOF) before exiting */
int part_eof_thres = 0;
/* Handle last offset written for each partition of topic */
int64_t *g_partions_offset = NULL;
static void read_index_file( char const *index_file, uint32_t part_cnt )
{
FILE *stream = fopen(index_file, "r");
if (NULL == stream)
FATAL("[read_index_file] cannot open index file %s: %s", index_file, strerror(errno));
size_t const po_bytes = sizeof(*g_partions_offset) * part_cnt;
g_partions_offset = malloc(po_bytes);
memset(g_partions_offset, -1, po_bytes);
char line[1024];
char *sep = NULL, *e;
uint32_t part = 0;
int64_t offset = 0;
uint32_t i;
while (fgets(line, 1024, stream))
{
sep = strchr(line, ':');
if (NULL == sep)
FATAL("Cannot find partition:offset separator");
*sep = '\0';
// parse
part = strtoul(line, &e, 0);
if (e == line)
FATAL("Failed to parse partion ID: %s", line);
if (part >= part_cnt)
FATAL("Wrong partion ID: %u part_cnt: %u", part, part_cnt);
offset = strtoll(sep + 1, &e, 0);
if (e == sep + 1)
FATAL("Failed to parse offset: %s for part id: %u", sep + 1, part);
g_partions_offset[part] = offset;
}
fclose(stream);
// check for all sets
for( i = 0; i < part_cnt; ++i ) {
if (g_partions_offset[i] < 0)
FATAL("Offset for partition ID: %u is not set!", i);
}
// exit only if all partitions handled eof
part_eof_thres = part_cnt;
}
static void write_index_file( char const *index_file, uint32_t part_cnt )
{
FILE *stream = fopen(index_file, "w+");
if (NULL == stream)
FATAL("[write_index_file] cannot open index file %s: %s", index_file, strerror(errno));
uint32_t i;
for( i = 0; i < part_cnt; ++i ) {
INFO(3, "Written to offset index file: %u:%ld\n", i, g_partions_offset[i]);
fprintf(stream, "%u:%ld\n", i, g_partions_offset[i]);
}
fclose(stream);
}
/**
* Fatal error: print error and exit
*/
void RD_NORETURN fatal0 (const char *func, int line,
const char *fmt, ...) {
va_list ap;
char buf[1024];
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
INFO(2, "Fatal error at %s:%i:\n", func, line);
fprintf(stderr, "%% ERROR: %s\n", buf);
exit(1);
}
/**
* Print error and exit if needed
*/
void error0 (int exitonerror, const char *func, int line, const char *fmt, ...) {
va_list ap;
char buf[1024];
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
if (exitonerror)
INFO(2, "Error at %s:%i:\n", func, line);
fprintf(stderr, "%% ERROR: %s%s\n", buf, exitonerror ? " : terminating":"");
if (exitonerror)
exit(1);
}
/**
* The delivery report callback is called once per message to
* report delivery success or failure.
*/
static void dr_msg_cb (rd_kafka_t *rk, const rd_kafka_message_t *rkmessage,
void *opaque) {
static int say_once = 1;
if (rkmessage->err) {
INFO(1, "Delivery failed for message: %s\n",
rd_kafka_err2str(rkmessage->err));
stats.tx_err_dr++;
return;
}
INFO(3, "Message delivered to partition %"PRId32" (offset %"PRId64")\n",
rkmessage->partition, rkmessage->offset);
if (rkmessage->offset == 0 && say_once) {
INFO(3, "Enable message offset reporting "
"with '-X topic.produce.offset.report=true'\n");
say_once = 0;
}
stats.tx_delivered++;
}
/**
* Produces a single message, retries on queue congestion, and
* exits hard on error.
*/
static void produce (void *buf, size_t len,
const void *key, size_t key_len, int msgflags) {
/* Produce message: keep trying until it succeeds. */
do {
rd_kafka_resp_err_t err;
if (!conf.run)
FATAL("Program terminated while "
"producing message of %zd bytes", len);
if (rd_kafka_produce(conf.rkt, conf.partition, msgflags,
buf, len, key, key_len, NULL) != -1) {
stats.tx++;
break;
}
err = rd_kafka_errno2err(errno);
if (err != RD_KAFKA_RESP_ERR__QUEUE_FULL)
FATAL("Failed to produce message (%zd bytes): %s",
len, rd_kafka_err2str(err));
stats.tx_err_q++;
/* Internal queue full, sleep to allow
* messages to be produced/time out
* before trying again. */
rd_kafka_poll(conf.rk, 5);
} while (1);
/* Poll for delivery reports, errors, etc. */
rd_kafka_poll(conf.rk, 0);
}
/**
* Produce contents of file as a single message.
* Returns the file length on success, else -1.
*/
static ssize_t produce_file (const char *path) {
int fd;
void *ptr;
struct stat st;
ssize_t sz;
int msgflags = 0;
if ((fd = _COMPAT(open)(path, O_RDONLY)) == -1) {
INFO(1, "Failed to open %s: %s\n", path, strerror(errno));
return -1;
}
if (fstat(fd, &st) == -1) {
INFO(1, "Failed to stat %s: %s\n", path, strerror(errno));
_COMPAT(close)(fd);
return -1;
}
if (st.st_size == 0) {
INFO(3, "Skipping empty file %s\n", path);
_COMPAT(close)(fd);
return 0;
}
#ifndef _MSC_VER
ptr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (ptr == MAP_FAILED) {
INFO(1, "Failed to mmap %s: %s\n", path, strerror(errno));
_COMPAT(close)(fd);
return -1;
}
sz = st.st_size;
msgflags = RD_KAFKA_MSG_F_COPY;
#else
ptr = malloc(st.st_size);
if (!ptr) {
INFO(1, "Failed to allocate message for %s: %s\n",
path, strerror(errno));
_COMPAT(close)(fd);
return -1;
}
sz = _read(fd, ptr, st.st_size);
if (sz < st.st_size) {
INFO(1, "Read failed for %s (%zd/%zd): %s\n",
path, sz, (size_t)st.st_size, sz == -1 ? strerror(errno) :
"incomplete read");
free(ptr);
close(fd);
return -1;
}
msgflags = RD_KAFKA_MSG_F_FREE;
#endif
INFO(4, "Producing file %s (%"PRIdMAX" bytes)\n",
path, (intmax_t)st.st_size);
produce(ptr, sz, NULL, 0, msgflags);
_COMPAT(close)(fd);
if (!(msgflags & RD_KAFKA_MSG_F_FREE)) {
#ifndef _MSC_VER
munmap(ptr, st.st_size);
#else
free(ptr);
#endif
}
return sz;
}
/**
* Run producer, reading messages from 'fp' and producing to kafka.
* Or if 'pathcnt' is > 0, read messages from files in 'paths' instead.
*/
static void producer_run (FILE *fp, char **paths, int pathcnt) {
char *sbuf = NULL;
size_t size = 0;
ssize_t len;
char errstr[512];
/* Assign per-message delivery report callback. */
rd_kafka_conf_set_dr_msg_cb(conf.rk_conf, dr_msg_cb);
/* Create producer */
if (!(conf.rk = rd_kafka_new(RD_KAFKA_PRODUCER, conf.rk_conf,
errstr, sizeof(errstr))))
FATAL("Failed to create producer: %s", errstr);
if (!conf.debug && conf.verbosity == 0)
rd_kafka_set_log_level(conf.rk, 0);
/* Create topic */
if (!(conf.rkt = rd_kafka_topic_new(conf.rk, conf.topic,
conf.rkt_conf)))
FATAL("Failed to create topic %s: %s", conf.topic,
rd_kafka_err2str(rd_kafka_errno2err(errno)));
conf.rk_conf = NULL;
conf.rkt_conf = NULL;
if (pathcnt > 0 && !(conf.flags & CONF_F_LINE)) {
int i;
int good = 0;
/* Read messages from files, each file is its own message. */
for (i = 0 ; i < pathcnt ; i++)
if (produce_file(paths[i]) != -1)
good++;
if (!good)
conf.exitcode = 1;
else if (good < pathcnt)
INFO(1, "Failed to produce from %i/%i files\n",
pathcnt - good, pathcnt);
} else {
/* Read messages from input, delimited by conf.delim */
while (conf.run &&
(len = getdelim(&sbuf, &size, conf.delim, fp)) != -1) {
int msgflags = 0;
char *buf = sbuf;
char *key = NULL;
size_t key_len = 0;
size_t orig_len = len;
if (len == 0)
continue;
/* Shave off delimiter */
if ((int)buf[len-1] == conf.delim)
len--;
if (len == 0)
continue;
/* Extract key, if desired and found. */
if (conf.flags & CONF_F_KEY_DELIM) {
char *t;
if ((t = memchr(buf, conf.key_delim, len))) {
key_len = (size_t)(t-sbuf);
key = buf;
buf += key_len+1;
len -= key_len+1;
/* Since buf has been forwarded
* from its initial allocation point
* we must make sure we dont tell
* librdkafka to free it (since the
* address would be wrong). */
msgflags |= RD_KAFKA_MSG_F_COPY;
if (conf.flags & CONF_F_NULL) {
if (len == 0)
buf = NULL;
if (key_len == 0)
key = NULL;
}
}
}
if (!(msgflags & RD_KAFKA_MSG_F_COPY) &&
len > 1024 && !(conf.flags & CONF_F_TEE)) {
/* If message is larger than this arbitrary
* threshold it will be more effective to
* not copy the data but let rdkafka own it
* instead.
*
* Note that CONF_T_TEE must be checked,
* otherwise a possible race might occur.
* */
msgflags |= RD_KAFKA_MSG_F_FREE;
} else {
/* For smaller messages a copy is
* more efficient. */
msgflags |= RD_KAFKA_MSG_F_COPY;
}
/* Produce message */
produce(buf, len, key, key_len, msgflags);
if (conf.flags & CONF_F_TEE &&
fwrite(sbuf, orig_len, 1, stdout) != 1)
FATAL("Tee write error for message of %zd bytes: %s",
orig_len, strerror(errno));
if (msgflags & RD_KAFKA_MSG_F_FREE) {
/* rdkafka owns the allocated buffer
* memory now. */
sbuf = NULL;
size = 0;
}
/* Enforce -c <cnt> */
if (stats.tx == (uint64_t)conf.msg_cnt)
conf.run = 0;
}
if (conf.run) {
if (!feof(fp))
FATAL("Unable to read message: %s",
strerror(errno));
}
}
/* Wait for all messages to be transmitted */
conf.run = 1;
while (conf.run && rd_kafka_outq_len(conf.rk))
rd_kafka_poll(conf.rk, 50);
rd_kafka_topic_destroy(conf.rkt);
rd_kafka_destroy(conf.rk);
if (sbuf)
free(sbuf);
if (stats.tx_err_dr)
conf.exitcode = 1;
}
static void handle_partition_eof (rd_kafka_message_t *rkmessage) {
if (conf.mode == 'C') {
/* Store EOF offset.
* If partition is empty and at offset 0,
* store future first message (0). */
rd_kafka_offset_store(rkmessage->rkt,
rkmessage->partition,
rkmessage->offset == 0 ?
0 : rkmessage->offset-1);
if (NULL != g_partions_offset) {
/* store partition last offset */
g_partions_offset[rkmessage->partition] = rkmessage->offset;
}
if (conf.exit_eof) {
if (!part_eof[rkmessage->partition]) {
/* Stop consuming this partition */
rd_kafka_consume_stop(rkmessage->rkt,
rkmessage->partition);
part_eof[rkmessage->partition] = 1;
part_eof_cnt++;
if (part_eof_cnt >= part_eof_thres)
conf.run = 0;
}
}
} else if (conf.mode == 'G') {
/* FIXME: Not currently handled */
}
INFO(1, "Reached end of topic %s [%"PRId32"] "
"at offset %"PRId64"%s\n",
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition,
rkmessage->offset,
!conf.run ? ": exiting" : "");
}
/**
* Consume callback, called for each message consumed.
*/
static void consume_cb (rd_kafka_message_t *rkmessage, void *opaque) {
FILE *fp = opaque;
if (!conf.run)
return;
if (rkmessage->err) {
if (rkmessage->err == RD_KAFKA_RESP_ERR__PARTITION_EOF) {
handle_partition_eof(rkmessage);
return;
}
FATAL("Topic %s [%"PRId32"] error: %s",
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition,
rd_kafka_message_errstr(rkmessage));
}
/* Print message */
fmt_msg_output(fp, rkmessage);
if (conf.mode == 'C') {
rd_kafka_offset_store(rkmessage->rkt,
rkmessage->partition,
rkmessage->offset);
}
if (++stats.rx == (uint64_t)conf.msg_cnt)
conf.run = 0;
}
#if RD_KAFKA_VERSION >= 0x00090000
static void throttle_cb (rd_kafka_t *rk, const char *broker_name,
int32_t broker_id, int throttle_time_ms, void *opaque){
INFO(1, "Broker %s (%"PRId32") throttled request for %dms\n",
broker_name, broker_id, throttle_time_ms);
}
#endif
#if ENABLE_KAFKACONSUMER
static void print_partition_list (int is_assigned,
const rd_kafka_topic_partition_list_t
*partitions) {
int i;
for (i = 0 ; i < partitions->cnt ; i++) {
fprintf(stderr, "%s%s [%"PRId32"]",
i > 0 ? ", ":"",
partitions->elems[i].topic,
partitions->elems[i].partition);
}
fprintf(stderr, "\n");
}
static void rebalance_cb (rd_kafka_t *rk, rd_kafka_resp_err_t err,
rd_kafka_topic_partition_list_t *partitions,
void *opaque) {
INFO(1, "Group %s rebalanced (memberid %s): ",
conf.group, rd_kafka_memberid(rk));
switch (err)
{
case RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS:
if (conf.verbosity >= 1) {
fprintf(stderr, "assigned: ");
print_partition_list(1, partitions);
}
rd_kafka_assign(rk, partitions);
break;
case RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS:
if (conf.verbosity >= 1) {
fprintf(stderr, "revoked: ");
print_partition_list(1, partitions);
}
rd_kafka_assign(rk, NULL);
break;
default:
INFO(0, "failed: %s\n", rd_kafka_err2str(err));
break;
}
}
/**
* Run high-level KafkaConsumer, write messages to 'fp'
*/
static void kafkaconsumer_run (FILE *fp, char *const *topics, int topic_cnt) {
char errstr[512];
rd_kafka_resp_err_t err;
rd_kafka_topic_partition_list_t *topiclist;
int i;
rd_kafka_conf_set_rebalance_cb(conf.rk_conf, rebalance_cb);
rd_kafka_conf_set_default_topic_conf(conf.rk_conf, conf.rkt_conf);
conf.rkt_conf = NULL;
/* Create consumer */
if (!(conf.rk = rd_kafka_new(RD_KAFKA_CONSUMER, conf.rk_conf,
errstr, sizeof(errstr))))
FATAL("Failed to create consumer: %s", errstr);
conf.rk_conf = NULL;
/* Forward main event queue to consumer queue so we can
* serve both queues with a single consumer_poll() call. */
rd_kafka_poll_set_consumer(conf.rk);
if (conf.debug)
rd_kafka_set_log_level(conf.rk, LOG_DEBUG);
else if (conf.verbosity == 0)
rd_kafka_set_log_level(conf.rk, 0);
/* Build subscription set */
topiclist = rd_kafka_topic_partition_list_new(topic_cnt);
for (i = 0 ; i < topic_cnt ; i++)
rd_kafka_topic_partition_list_add(topiclist, topics[i], -1);
/* Subscribe */
if ((err = rd_kafka_subscribe(conf.rk, topiclist)))
FATAL("Failed to subscribe to %d topics: %s\n",
topiclist->cnt, rd_kafka_err2str(err));
rd_kafka_topic_partition_list_destroy(topiclist);
/* Read messages from Kafka, write to 'fp'. */
while (conf.run) {
rd_kafka_message_t *rkmessage;
rkmessage = rd_kafka_consumer_poll(conf.rk, 100);
if (!rkmessage)
continue;
consume_cb(rkmessage, fp);
rd_kafka_message_destroy(rkmessage);
}
if ((err = rd_kafka_consumer_close(conf.rk)))
FATAL("Failed to close consumer: %s\n", rd_kafka_err2str(err));
/* Wait for outstanding requests to finish. */
conf.run = 1;
while (conf.run && rd_kafka_outq_len(conf.rk) > 0)
rd_kafka_poll(conf.rk, 50);
rd_kafka_destroy(conf.rk);
}
#endif
/**
* Run consumer, consuming messages from Kafka and writing to 'fp'.
*/
static void consumer_run (FILE *fp) {
char errstr[512];
rd_kafka_resp_err_t err;
const rd_kafka_metadata_t *metadata;
int i;
rd_kafka_queue_t *rkqu;
/* Create consumer */
if (!(conf.rk = rd_kafka_new(RD_KAFKA_CONSUMER, conf.rk_conf,
errstr, sizeof(errstr))))
FATAL("Failed to create producer: %s", errstr);
if (!conf.debug && conf.verbosity == 0)
rd_kafka_set_log_level(conf.rk, 0);
/* The callback-based consumer API's offset store granularity is
* not good enough for us, disable automatic offset store
* and do it explicitly per-message in the consume callback instead. */
if (rd_kafka_topic_conf_set(conf.rkt_conf,
"auto.commit.enable", "false",
errstr, sizeof(errstr)) != RD_KAFKA_CONF_OK)
FATAL("%s", errstr);
/* Create topic */
if (!(conf.rkt = rd_kafka_topic_new(conf.rk, conf.topic,
conf.rkt_conf)))
FATAL("Failed to create topic %s: %s", conf.topic,
rd_kafka_err2str(rd_kafka_errno2err(errno)));
conf.rk_conf = NULL;
conf.rkt_conf = NULL;
/* Query broker for topic + partition information. */
if ((err = rd_kafka_metadata(conf.rk, 0, conf.rkt, &metadata, 5000)))
FATAL("Failed to query metadata for topic %s: %s",
rd_kafka_topic_name(conf.rkt), rd_kafka_err2str(err));
/* Error handling */
if (metadata->topic_cnt == 0)
FATAL("No such topic in cluster: %s",
rd_kafka_topic_name(conf.rkt));
if ((err = metadata->topics[0].err))
FATAL("Topic %s error: %s",
rd_kafka_topic_name(conf.rkt), rd_kafka_err2str(err));
if (metadata->topics[0].partition_cnt == 0)
FATAL("Topic %s has no partitions",
rd_kafka_topic_name(conf.rkt));
/* If Exit-at-EOF is enabled, set up array to track EOF
* state for each partition. */
if (conf.exit_eof) {
part_eof = calloc(sizeof(*part_eof),
metadata->topics[0].partition_cnt);
if (conf.partition != RD_KAFKA_PARTITION_UA)
part_eof_thres = 1;
else
part_eof_thres = metadata->topics[0].partition_cnt;
}
if (NULL != conf.index_file)
read_index_file(conf.index_file, metadata->topics[0].partition_cnt);
/* Create a shared queue that combines messages from
* all wanted partitions. */
rkqu = rd_kafka_queue_new(conf.rk);
/* Start consuming from all wanted partitions. */
for (i = 0 ; i < metadata->topics[0].partition_cnt ; i++) {
int32_t partition = metadata->topics[0].partitions[i].id;
/* If -p <part> was specified: skip unwanted partitions */
if (conf.partition != RD_KAFKA_PARTITION_UA &&
conf.partition != partition)
continue;
int64_t offset = NULL == g_partions_offset ? conf.offset : g_partions_offset[partition];
/* Start consumer for this partition */
if (rd_kafka_consume_start_queue(conf.rkt, partition, offset, rkqu) == -1)
FATAL("Failed to start consuming "
"topic %s [%"PRId32"]: %s",
conf.topic, partition,
rd_kafka_err2str(rd_kafka_errno2err(errno)));
if (conf.partition != RD_KAFKA_PARTITION_UA)
break;
}
if (conf.partition != RD_KAFKA_PARTITION_UA &&
i == metadata->topics[0].partition_cnt)
FATAL("Topic %s (with partitions 0..%i): "
"partition %i does not exist",
rd_kafka_topic_name(conf.rkt),
metadata->topics[0].partition_cnt-1,
conf.partition);
/* Read messages from Kafka, write to 'fp'. */
while (conf.run) {
rd_kafka_consume_callback_queue(rkqu, 100,
consume_cb, fp);
/* Poll for errors, etc */
rd_kafka_poll(conf.rk, 0);
}
/* Stop consuming */
for (i = 0 ; i < metadata->topics[0].partition_cnt ; i++) {
int32_t partition = metadata->topics[0].partitions[i].id;
/* If -p <part> was specified: skip unwanted partitions */
if (conf.partition != RD_KAFKA_PARTITION_UA &&
conf.partition != partition)
continue;
/* Dont stop already stopped partitions */
if (!part_eof || !part_eof[partition])
rd_kafka_consume_stop(conf.rkt, partition);
rd_kafka_consume_stop(conf.rkt, partition);
}
/* Destroy shared queue */
rd_kafka_queue_destroy(rkqu);
/* Wait for outstanding requests to finish. */
conf.run = 1;
while (conf.run && rd_kafka_outq_len(conf.rk) > 0)
rd_kafka_poll(conf.rk, 50);
/* flush offsets if enabled */
if (NULL != g_partions_offset) {
write_index_file(conf.index_file, metadata->topics[0].partition_cnt);
free(g_partions_offset);
g_partions_offset = NULL;
}
rd_kafka_metadata_destroy(metadata);
rd_kafka_topic_destroy(conf.rkt);
rd_kafka_destroy(conf.rk);
}
/**
* Print metadata information
*/
static void metadata_print (const rd_kafka_metadata_t *metadata) {
int i, j, k;
printf("Metadata for %s (from broker %"PRId32": %s):\n",
conf.topic ? conf.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 rd_kafka_metadata_topic_t *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 rd_kafka_metadata_partition_t *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");
}
}
}
/**
* Lists metadata
*/
static void metadata_list (void) {
char errstr[512];
rd_kafka_resp_err_t err;
const rd_kafka_metadata_t *metadata;
/* Create handle */
if (!(conf.rk = rd_kafka_new(RD_KAFKA_PRODUCER, conf.rk_conf,
errstr, sizeof(errstr))))
FATAL("Failed to create producer: %s", errstr);
if (!conf.debug && conf.verbosity == 0)
rd_kafka_set_log_level(conf.rk, 0);
/* Create topic, if specified */
if (conf.topic &&
!(conf.rkt = rd_kafka_topic_new(conf.rk, conf.topic,
conf.rkt_conf)))
FATAL("Failed to create topic %s: %s", conf.topic,
rd_kafka_err2str(rd_kafka_errno2err(errno)));
conf.rk_conf = NULL;
conf.rkt_conf = NULL;
/* Fetch metadata */
err = rd_kafka_metadata(conf.rk, conf.rkt ? 0 : 1, conf.rkt,
&metadata, 5000);
if (err != RD_KAFKA_RESP_ERR_NO_ERROR)
FATAL("Failed to acquire metadata: %s", rd_kafka_err2str(err));
/* Print metadata */
#if ENABLE_JSON
if (conf.flags & CONF_F_FMT_JSON)
metadata_print_json(metadata);
else
#endif
metadata_print(metadata);
rd_kafka_metadata_destroy(metadata);
if (conf.rkt)
rd_kafka_topic_destroy(conf.rkt);
rd_kafka_destroy(conf.rk);
}
/**
* Print usage and exit.
*/
static void RD_NORETURN usage (const char *argv0, int exitcode,
const char *reason,
int version_only) {
FILE *out = stdout;
char features[256];
size_t flen;
rd_kafka_conf_t *tmpconf;
if (reason) {
out = stderr;
fprintf(out, "Error: %s\n\n", reason);
}
if (!version_only)
fprintf(out, "Usage: %s <options> [file1 file2 .. | topic1 topic2 ..]]\n",
argv0);
/* Create a temporary config object to extract builtin.features */
tmpconf = rd_kafka_conf_new();
flen = sizeof(features);
if (rd_kafka_conf_get(tmpconf, "builtin.features",
features, &flen) != RD_KAFKA_CONF_OK)
strncpy(features, "n/a", sizeof(features));
rd_kafka_conf_destroy(tmpconf);
fprintf(out,
"kafkacat - Apache Kafka producer and consumer tool\n"
"https://github.com/edenhill/kafkacat\n"
"Copyright (c) 2014-2015, Magnus Edenhill\n"
"Version %s%s (librdkafka %s builtin.features=%s)\n"
"\n",
KAFKACAT_VERSION,
#if ENABLE_JSON
" (JSON)",
#else
"",
#endif
rd_kafka_version_str(), features
);
if (version_only)
exit(exitcode);
fprintf(out, "\n"
"General options:\n"
" -C | -P | -L | -Q Mode: Consume, Produce, Metadata List, Query mode\n"
#if ENABLE_KAFKACONSUMER
" -G <group-id> Mode: High-level KafkaConsumer (Kafka 0.9 balanced consumer groups)\n"
" Expects a list of topics to subscribe to\n"
#endif
" -t <topic> Topic to consume from, produce to, "
"or list\n"
" -p <partition> Partition\n"
" -b <brokers,..> Bootstrap broker(s) (host[:port])\n"
" -D <delim> Message delimiter character:\n"
" a-z.. | \\r | \\n | \\t | \\xNN\n"
" Default: \\n\n"
" -E Do not exit on non fatal error\n"
" -K <delim> Key delimiter (same format as -D)\n"
" -c <cnt> Limit message count\n"
" -X list List available librdkafka configuration "
"properties\n"
" -X prop=val Set librdkafka configuration property.\n"
" Properties prefixed with \"topic.\" are\n"
" applied as topic properties.\n"
" -X dump Dump configuration and exit.\n"