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0083-cb_event.c
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/*
* librdkafka - Apache Kafka C library
*
* Copyright (c) 2018-2022, 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.
*/
/**
* Tests the queue callback IO event signalling.
*/
#include "test.h"
/* Typical include path would be <librdkafka/rdkafka.h>, but this program
* is built from within the librdkafka source tree and thus differs. */
#include "rdkafka.h" /* for Kafka driver */
/**
* @brief Thread safe event counter */
static struct {
mtx_t lock;
int count;
} event_receiver;
/**
* @brief Event callback function. Check the opaque pointer and
* increase the count of received event. */
static void event_cb(rd_kafka_t *rk_p, void *opaque) {
TEST_ASSERT(opaque == (void *)0x1234,
"Opaque pointer is not as expected (got: %p)", opaque);
mtx_lock(&event_receiver.lock);
event_receiver.count += 1;
mtx_unlock(&event_receiver.lock);
}
/**
* @brief Wait for one or more events to be received.
* Return 0 if no event was received within the timeout. */
static int wait_event_cb(int timeout_secs) {
int event_count = 0;
for (; timeout_secs >= 0; timeout_secs--) {
mtx_lock(&event_receiver.lock);
event_count = event_receiver.count;
event_receiver.count = 0;
mtx_unlock(&event_receiver.lock);
if (event_count > 0 || timeout_secs == 0)
return event_count;
rd_sleep(1);
}
return 0;
}
int main_0083_cb_event(int argc, char **argv) {
rd_kafka_conf_t *conf;
rd_kafka_topic_conf_t *tconf;
rd_kafka_t *rk_p, *rk_c;
const char *topic;
rd_kafka_topic_t *rkt_p;
rd_kafka_queue_t *queue;
uint64_t testid;
int msgcnt = 100;
int recvd = 0;
int wait_multiplier = 1;
rd_kafka_resp_err_t err;
enum { _NOPE, _YEP, _REBALANCE } expecting_io = _REBALANCE;
int callback_event_count;
rd_kafka_event_t *rkev;
int eventcnt = 0;
mtx_init(&event_receiver.lock, mtx_plain);
testid = test_id_generate();
topic = test_mk_topic_name(__FUNCTION__, 1);
rk_p = test_create_producer();
rkt_p = test_create_producer_topic(rk_p, topic, NULL);
test_wait_topic_exists(rk_p, topic, 5000);
err = test_auto_create_topic_rkt(rk_p, rkt_p, tmout_multip(5000));
TEST_ASSERT(!err, "Topic auto creation failed: %s",
rd_kafka_err2str(err));
test_conf_init(&conf, &tconf, 0);
rd_kafka_conf_set_events(conf, RD_KAFKA_EVENT_REBALANCE);
test_conf_set(conf, "session.timeout.ms", "6000");
test_conf_set(conf, "enable.partition.eof", "false");
/* Speed up propagation of new topics */
test_conf_set(conf, "metadata.max.age.ms", "5000");
test_topic_conf_set(tconf, "auto.offset.reset", "earliest");
rk_c = test_create_consumer(topic, NULL, conf, tconf);
queue = rd_kafka_queue_get_consumer(rk_c);
test_consumer_subscribe(rk_c, topic);
rd_kafka_queue_cb_event_enable(queue, event_cb, (void *)0x1234);
/**
* 1) Wait for rebalance event
* 2) Wait 1 interval (1s) expecting no IO (nothing produced).
* 3) Produce half the messages
* 4) Expect CB
* 5) Consume the available messages
* 6) Wait 1 interval expecting no CB.
* 7) Produce remaing half
* 8) Expect CB
* 9) Done.
*/
while (recvd < msgcnt) {
TEST_SAY("Waiting for event\n");
callback_event_count = wait_event_cb(1 * wait_multiplier);
TEST_ASSERT(callback_event_count <= 1,
"Event cb called %d times", callback_event_count);
if (callback_event_count == 1) {
TEST_SAY("Events received: %d\n", callback_event_count);
while ((rkev = rd_kafka_queue_poll(queue, 0))) {
eventcnt++;
switch (rd_kafka_event_type(rkev)) {
case RD_KAFKA_EVENT_REBALANCE:
TEST_SAY(
"Got %s: %s\n",
rd_kafka_event_name(rkev),
rd_kafka_err2str(
rd_kafka_event_error(rkev)));
if (expecting_io != _REBALANCE)
TEST_FAIL(
"Got Rebalance when "
"expecting message\n");
if (rd_kafka_event_error(rkev) ==
RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS) {
rd_kafka_assign(
rk_c,
rd_kafka_event_topic_partition_list(
rkev));
expecting_io = _NOPE;
} else
rd_kafka_assign(rk_c, NULL);
break;
case RD_KAFKA_EVENT_FETCH:
if (expecting_io != _YEP)
TEST_FAIL(
"Did not expect more "
"messages at %d/%d\n",
recvd, msgcnt);
recvd++;
if (recvd == (msgcnt / 2) ||
recvd == msgcnt)
expecting_io = _NOPE;
break;
case RD_KAFKA_EVENT_ERROR:
TEST_FAIL(
"Error: %s\n",
rd_kafka_event_error_string(rkev));
break;
default:
TEST_SAY("Ignoring event %s\n",
rd_kafka_event_name(rkev));
}
rd_kafka_event_destroy(rkev);
}
TEST_SAY("%d events, Consumed %d/%d messages\n",
eventcnt, recvd, msgcnt);
wait_multiplier = 1;
} else {
if (expecting_io == _REBALANCE) {
continue;
} else if (expecting_io == _YEP) {
TEST_FAIL(
"Did not see expected IO after %d/%d "
"msgs\n",
recvd, msgcnt);
}
TEST_SAY("Event wait timeout (good)\n");
TEST_SAY("Got idle period, producing\n");
test_produce_msgs(rk_p, rkt_p, testid, 0, recvd,
msgcnt / 2, NULL, 10);
expecting_io = _YEP;
/* When running slowly (e.g., valgrind) it might take
* some time before the first message is received
* after producing. */
wait_multiplier = 3;
}
}
TEST_SAY("Done\n");
rd_kafka_topic_destroy(rkt_p);
rd_kafka_destroy(rk_p);
rd_kafka_queue_destroy(queue);
rd_kafka_consumer_close(rk_c);
rd_kafka_destroy(rk_c);
mtx_destroy(&event_receiver.lock);
return 0;
}