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kcat.c
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/*
* kcat - Apache Kafka consumer and producer
*
* Copyright (c) 2014-2021, 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 <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "kcat.h"
#include "input.h"
#if ENABLE_MOCK
#include <librdkafka/rdkafka_mock.h>
#endif
#if RD_KAFKA_VERSION >= 0x01040000
#define ENABLE_TXNS 1
#endif
#if RD_KAFKA_VERSION >= 0x01060000
#define ENABLE_INCREMENTAL_ASSIGN 1
#endif
struct conf conf = {
.run = 1,
.verbosity = 1,
.exitonerror = 1,
.partition = RD_KAFKA_PARTITION_UA,
.msg_size = 1024*1024,
.null_str = "NULL",
.fixed_key = NULL,
.metadata_timeout = 5,
.offset = RD_KAFKA_OFFSET_INVALID,
};
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 stopped state array */
int *part_stop = NULL;
/* Number of partitions that are stopped */
int part_stop_cnt = 0;
/* Threshold level (partitions stopped) before exiting */
int part_stop_thres = 0;
/**
* 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);
KC_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)
KC_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) {
int32_t broker_id = -1;
struct buf *b = rkmessage->_private;
if (b)
buf_destroy(b);
if (rkmessage->err) {
KC_INFO(1, "Delivery failed for message: %s\n",
rd_kafka_err2str(rkmessage->err));
stats.tx_err_dr++;
return;
}
#if RD_KAFKA_VERSION >= 0x010500ff
broker_id = rd_kafka_message_broker_id(rkmessage);
#endif
KC_INFO(3,
"Message delivered to partition %"PRId32" (offset %"PRId64") "
"on broker %"PRId32"\n",
rkmessage->partition, rkmessage->offset, broker_id);
#if RD_KAFKA_VERSION < 0x01000000
if (rkmessage->offset == 0 && say_once) {
static int say_once = 1;
KC_INFO(3, "Enable message offset reporting "
"with '-X topic.produce.offset.report=true'\n");
say_once = 0;
}
#endif
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,
void *msg_opaque) {
rd_kafka_headers_t *hdrs = NULL;
/* Headers are freed on successful producev(), pass a copy. */
if (conf.headers)
hdrs = rd_kafka_headers_copy(conf.headers);
/* Produce message: keep trying until it succeeds. */
do {
rd_kafka_resp_err_t err;
if (!conf.run)
KC_FATAL("Program terminated while "
"producing message of %zd bytes", len);
err = rd_kafka_producev(
conf.rk,
RD_KAFKA_V_RKT(conf.rkt),
RD_KAFKA_V_PARTITION(conf.partition),
RD_KAFKA_V_MSGFLAGS(msgflags),
RD_KAFKA_V_VALUE(buf, len),
RD_KAFKA_V_KEY(key, key_len),
RD_KAFKA_V_HEADERS(hdrs),
RD_KAFKA_V_OPAQUE(msg_opaque),
RD_KAFKA_V_END);
if (!err) {
stats.tx++;
break;
}
if (err != RD_KAFKA_RESP_ERR__QUEUE_FULL)
KC_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) {
KC_INFO(1, "Failed to open %s: %s\n", path, strerror(errno));
return -1;
}
if (fstat(fd, &st) == -1) {
KC_INFO(1, "Failed to stat %s: %s\n", path, strerror(errno));
_COMPAT(close)(fd);
return -1;
}
if (st.st_size == 0) {
KC_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) {
KC_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) {
KC_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) {
KC_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
KC_INFO(4, "Producing file %s (%"PRIdMAX" bytes)\n",
path, (intmax_t)st.st_size);
produce(ptr, sz, conf.fixed_key, conf.fixed_key_len, msgflags, NULL);
_COMPAT(close)(fd);
if (!(msgflags & RD_KAFKA_MSG_F_FREE)) {
#ifndef _MSC_VER
munmap(ptr, st.st_size);
#else
free(ptr);
#endif
}
return sz;
}
static char *rd_strnstr (const char *haystack, size_t size,
const char *needle, size_t needle_len) {
const char *nend = needle + needle_len - 1;
const char *t;
size_t of = needle_len - 1;
while (of < size &&
(t = (const char *)memchr((void *)(haystack + of),
(int)*nend,
size - of))) {
const char *n = nend;
const char *p = t;
do {
n--;
p--;
} while (n >= needle && *n == *p);
if (n < needle)
return (char *)p+1;
of = (size_t)(t - haystack) + 1;
}
return NULL;
}
/**
* 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 errstr[512];
char tmp[16];
size_t tsize = sizeof(tmp);
if (rd_kafka_conf_get(conf.rk_conf, "transactional.id",
tmp, &tsize) == RD_KAFKA_CONF_OK && tsize > 1) {
KC_INFO(1, "Using transactional producer\n");
conf.txn = 1;
}
tsize = sizeof(tmp);
if (rd_kafka_conf_get(conf.rk_conf, "message.max.bytes",
tmp, &tsize) == RD_KAFKA_CONF_OK && tsize > 1) {
int msg_max_bytes = atoi(tmp);
KC_INFO(3, "Setting producer input buffer max size to "
"message.max.bytes value %d\n", msg_max_bytes);
conf.msg_size = msg_max_bytes;
}
/* 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))))
KC_FATAL("Failed to create producer: %s", errstr);
if (!conf.debug && conf.verbosity == 0)
rd_kafka_set_log_level(conf.rk, 0);
#if ENABLE_TXNS
if (conf.txn) {
rd_kafka_error_t *error;
error = rd_kafka_init_transactions(conf.rk,
conf.metadata_timeout*1000);
if (error)
KC_FATAL("init_transactions(): %s",
rd_kafka_error_string(error));
error = rd_kafka_begin_transaction(conf.rk);
if (error)
KC_FATAL("begin_transaction(): %s",
rd_kafka_error_string(error));
}
#endif
/* Create topic */
if (!(conf.rkt = rd_kafka_topic_new(conf.rk, conf.topic,
conf.rkt_conf)))
KC_FATAL("Failed to create topic %s: %s", conf.topic,
rd_kafka_err2str(rd_kafka_last_error()));
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)
KC_INFO(1, "Failed to produce from %i/%i files\n",
pathcnt - good, pathcnt);
} else {
struct inbuf inbuf;
struct buf *b;
inbuf_init(&inbuf, conf.msg_size, conf.delim, conf.delim_size);
/* Read messages from input, delimited by conf.delim */
while (conf.run &&
inbuf_read_to_delimeter(&inbuf, fp, &b)) {
int msgflags = 0;
char *buf = b->buf;
char *key = NULL;
size_t key_len = 0;
size_t len = b->size;
if (len == 0) {
buf_destroy(b);
continue;
}
/* Extract key, if desired and found. */
if (conf.flags & CONF_F_KEY_DELIM) {
char *t;
if ((t = rd_strnstr(buf, len,
conf.key_delim,
conf.key_delim_size))) {
key_len = (size_t)(t-buf);
key = buf;
buf = t + conf.key_delim_size;
len -= key_len + conf.key_delim_size;
if (conf.flags & CONF_F_NULL) {
if (len == 0)
buf = NULL;
if (key_len == 0)
key = NULL;
}
}
}
if (!key && conf.fixed_key) {
key = conf.fixed_key;
key_len = conf.fixed_key_len;
}
if (len < 1024) {
/* If message is smaller than this arbitrary
* threshold it will be more effective to
* copy the data in librdkafka. */
msgflags |= RD_KAFKA_MSG_F_COPY;
}
/* Produce message */
produce(buf, len, key, key_len, msgflags,
(msgflags & RD_KAFKA_MSG_F_COPY) ?
NULL : b);
if (conf.flags & CONF_F_TEE &&
fwrite(b->buf, b->size, 1, stdout) != 1)
KC_FATAL("Tee write error for message "
"of %zd bytes: %s",
b->size, strerror(errno));
if (msgflags & RD_KAFKA_MSG_F_COPY) {
/* librdkafka made a copy of the input. */
buf_destroy(b);
}
/* Enforce -c <cnt> */
if (stats.tx == (uint64_t)conf.msg_cnt)
conf.run = 0;
}
if (conf.run) {
if (!feof(fp))
KC_FATAL("Unable to read message: %s",
strerror(errno));
}
}
#if ENABLE_TXNS
if (conf.txn) {
rd_kafka_error_t *error;
const char *what;
if (conf.term_sig) {
KC_INFO(0,
"Aborting transaction due to "
"termination signal\n");
what = "abort_transaction()";
error = rd_kafka_abort_transaction(
conf.rk, conf.metadata_timeout * 1000);
} else {
KC_INFO(1, "Committing transaction\n");
what = "commit_transaction()";
error = rd_kafka_commit_transaction(
conf.rk, conf.metadata_timeout * 1000);
if (!error)
KC_INFO(1,
"Transaction successfully committed\n");
}
if (error)
KC_FATAL("%s: %s", what, rd_kafka_error_string(error));
}
#endif
/* 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 (stats.tx_err_dr)
conf.exitcode = 1;
}
static void stop_partition (rd_kafka_message_t *rkmessage) {
if (!part_stop[rkmessage->partition]) {
/* Stop consuming this partition */
rd_kafka_consume_stop(rkmessage->rkt,
rkmessage->partition);
part_stop[rkmessage->partition] = 1;
part_stop_cnt++;
if (part_stop_cnt >= part_stop_thres)
conf.run = 0;
}
}
/**
* @brief Mark partition as not at EOF
*/
static void partition_not_eof (const rd_kafka_message_t *rkmessage) {
rd_kafka_topic_partition_t *rktpar;
if (conf.mode != 'G' || !conf.exit_eof ||
!conf.assignment || conf.eof_cnt == 0)
return;
/* Find partition in assignment */
rktpar = rd_kafka_topic_partition_list_find(
conf.assignment,
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition);
if (!rktpar || rktpar->err != RD_KAFKA_RESP_ERR__PARTITION_EOF)
return;
rktpar->err = RD_KAFKA_RESP_ERR_NO_ERROR;
conf.eof_cnt--;
}
/**
* @brief Mark partition as at EOF
*/
static void partition_at_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 (conf.exit_eof) {
stop_partition(rkmessage);
}
} else if (conf.mode == 'G' && conf.exit_eof && conf.assignment) {
/* Find partition in assignment */
rd_kafka_topic_partition_t *rktpar;
rktpar = rd_kafka_topic_partition_list_find(
conf.assignment,
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition);
if (rktpar && rktpar->err != RD_KAFKA_RESP_ERR__PARTITION_EOF) {
rktpar->err = RD_KAFKA_RESP_ERR__PARTITION_EOF;
conf.eof_cnt++;
if (conf.eof_cnt == conf.assignment->cnt)
conf.run = 0;
}
}
KC_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) {
partition_at_eof(rkmessage);
return;
}
if (rkmessage->rkt)
KC_FATAL("Topic %s [%"PRId32"] error: %s",
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition,
rd_kafka_message_errstr(rkmessage));
else
KC_FATAL("Consumer error: %s",
rd_kafka_message_errstr(rkmessage));
} else {
partition_not_eof(rkmessage);
}
if (conf.stopts) {
int64_t ts = rd_kafka_message_timestamp(rkmessage, NULL);
if (ts >= conf.stopts) {
stop_partition(rkmessage);
KC_INFO(1, "Reached stop timestamp for topic "
"%s [%"PRId32"] "
"at offset %"PRId64"%s\n",
rd_kafka_topic_name(rkmessage->rkt),
rkmessage->partition,
rkmessage->offset,
!conf.run ? ": exiting" : "");
return;
}
}
/* 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;
rd_kafka_yield(conf.rk);
}
}
#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){
KC_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");
}
#if ENABLE_INCREMENTAL_ASSIGN
static void
incremental_rebalance_cb (rd_kafka_t *rk, rd_kafka_resp_err_t err,
rd_kafka_topic_partition_list_t *partitions,
void *opaque) {
rd_kafka_error_t *error = NULL;
int i;
KC_INFO(1, "Group %s rebalanced: incremental %s of %d partition(s) "
"(memberid %s%s, %s rebalance protocol): ",
conf.group,
err == RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS ?
"assignment" : "revoke",
partitions->cnt,
rd_kafka_memberid(rk),
rd_kafka_assignment_lost(rk) ? ", assignment lost" : "",
rd_kafka_rebalance_protocol(rk));
switch (err)
{
case RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS:
if (conf.verbosity >= 1)
print_partition_list(1, partitions);
if (!conf.assignment)
conf.assignment =
rd_kafka_topic_partition_list_new(
partitions->cnt);
for (i = 0 ; i < partitions->cnt ; i++) {
rd_kafka_topic_partition_t *rktpar =
&partitions->elems[i];
/* Set start offset from -o .. */
if (conf.offset != RD_KAFKA_OFFSET_INVALID)
rktpar->offset = conf.offset;
rktpar->offset = conf.offset;
rd_kafka_topic_partition_list_add(conf.assignment,
rktpar->topic,
rktpar->partition);
}
error = rd_kafka_incremental_assign(rk, partitions);
break;
case RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS:
if (conf.verbosity >= 1)
print_partition_list(1, partitions);
/* Remove partitions from conf.assignment in reverse order
* to minimize array shrink sizes. */
for (i = partitions->cnt - 1 ;
conf.assignment && i >= 0 ;
i--) {
rd_kafka_topic_partition_t *rktpar =
&partitions->elems[i];
rd_kafka_topic_partition_list_del(conf.assignment,
rktpar->topic,
rktpar->partition);
}
error = rd_kafka_incremental_unassign(rk, partitions);
break;
default:
KC_INFO(0, "failed: %s\n", rd_kafka_err2str(err));
break;
}
if (error) {
KC_ERROR("Incremental rebalance %s of %d partition(s) "
"failed: %s\n",
err == RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS ?
"assign" : "unassign",
partitions->cnt, rd_kafka_error_string(error));
rd_kafka_error_destroy(error);
}
}
#endif
static void rebalance_cb (rd_kafka_t *rk, rd_kafka_resp_err_t err,
rd_kafka_topic_partition_list_t *partitions,
void *opaque) {
rd_kafka_resp_err_t ret_err = RD_KAFKA_RESP_ERR_NO_ERROR;
#if ENABLE_INCREMENTAL_ASSIGN
if (!strcmp(rd_kafka_rebalance_protocol(rk), "COOPERATIVE")) {
incremental_rebalance_cb(rk, err, partitions, opaque);
return;
}
#endif
KC_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);
}
if (conf.offset != RD_KAFKA_OFFSET_INVALID) {
int i;
for (i = 0 ; i < partitions->cnt ; i++)
partitions->elems[i].offset = conf.offset;
}
if (conf.assignment)
rd_kafka_topic_partition_list_destroy(conf.assignment);
conf.assignment =
rd_kafka_topic_partition_list_copy(partitions);
ret_err = 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);
}
if (conf.assignment) {
rd_kafka_topic_partition_list_destroy(conf.assignment);
conf.assignment = NULL;
}
ret_err = rd_kafka_assign(rk, NULL);
break;
default:
KC_INFO(0, "failed: %s\n", rd_kafka_err2str(err));
break;
}
if (ret_err)
KC_ERROR("Rebalance %s of %d partition(s) failed: %s\n",
err == RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS ?
"assign" : "unassign",
partitions->cnt, rd_kafka_err2str(ret_err));
}
/**
* 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))))
KC_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)))
KC_FATAL("Failed to subscribe to %d topics: %s\n",
topiclist->cnt, rd_kafka_err2str(err));
KC_INFO(1, "Waiting for group rebalance\n");
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)))
KC_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);
if (conf.assignment)
rd_kafka_topic_partition_list_destroy(conf.assignment);
rd_kafka_destroy(conf.rk);
}
#endif
/**
* Get offsets from conf.startts for consumer_run
*/
static int64_t *get_offsets (rd_kafka_metadata_topic_t *topic) {
int i;
int64_t *offsets;
rd_kafka_resp_err_t err;
rd_kafka_topic_partition_list_t *rktparlistp =
rd_kafka_topic_partition_list_new(1);
for (i = 0 ; i < topic->partition_cnt ; i++) {
int32_t partition = topic->partitions[i].id;
/* If -p <part> was specified: skip unwanted partitions */
if (conf.partition != RD_KAFKA_PARTITION_UA &&
conf.partition != partition)
continue;
rd_kafka_topic_partition_list_add(
rktparlistp,
rd_kafka_topic_name(conf.rkt),
partition)->offset = conf.startts;
if (conf.partition != RD_KAFKA_PARTITION_UA)
break;
}
err = rd_kafka_offsets_for_times(conf.rk, rktparlistp,
conf.metadata_timeout * 1000);
if (err)
KC_FATAL("offsets_for_times failed: %s", rd_kafka_err2str(err));
offsets = calloc(sizeof(int64_t), topic->partition_cnt);
for (i = 0 ; i < rktparlistp->cnt ; i++) {
const rd_kafka_topic_partition_t *p = &rktparlistp->elems[i];
offsets[p->partition] = p->offset;
}
rd_kafka_topic_partition_list_destroy(rktparlistp);
return offsets;
}
/**
* 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;
int64_t *offsets = NULL;
rd_kafka_queue_t *rkqu;
/* Create consumer */
if (!(conf.rk = rd_kafka_new(RD_KAFKA_CONSUMER, conf.rk_conf,
errstr, sizeof(errstr))))
KC_FATAL("Failed to create consumer: %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)
KC_FATAL("%s", errstr);
/* Create topic */
if (!(conf.rkt = rd_kafka_topic_new(conf.rk, conf.topic,
conf.rkt_conf)))
KC_FATAL("Failed to create topic %s: %s", conf.topic,
rd_kafka_err2str(rd_kafka_last_error()));
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,
conf.metadata_timeout * 1000)))
KC_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)
KC_FATAL("No such topic in cluster: %s",
rd_kafka_topic_name(conf.rkt));