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/*
* librdkafka - Apache Kafka C library
*
* Copyright (c) 2019-2022, 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.
*/
#include <iostream>
#include "testcpp.h"
extern "C" {
#include "rdkafka.h" /* For interceptor interface */
#include "../src/tinycthread.h" /* For mutexes */
}
class myThreadCb {
public:
myThreadCb() : startCnt_(0), exitCnt_(0) {
mtx_init(&lock_, mtx_plain);
}
~myThreadCb() {
mtx_destroy(&lock_);
}
int startCount() {
int cnt;
mtx_lock(&lock_);
cnt = startCnt_;
mtx_unlock(&lock_);
return cnt;
}
int exitCount() {
int cnt;
mtx_lock(&lock_);
cnt = exitCnt_;
mtx_unlock(&lock_);
return cnt;
}
virtual void thread_start_cb(const char *threadname) {
Test::Say(tostr() << "Started thread: " << threadname << "\n");
mtx_lock(&lock_);
startCnt_++;
mtx_unlock(&lock_);
}
virtual void thread_exit_cb(const char *threadname) {
Test::Say(tostr() << "Exiting from thread: " << threadname << "\n");
mtx_lock(&lock_);
exitCnt_++;
mtx_unlock(&lock_);
}
private:
int startCnt_;
int exitCnt_;
mtx_t lock_;
};
/**
* @brief C to C++ callback trampoline.
*/
static rd_kafka_resp_err_t on_thread_start_trampoline(
rd_kafka_t *rk,
rd_kafka_thread_type_t thread_type,
const char *threadname,
void *ic_opaque) {
myThreadCb *threadcb = (myThreadCb *)ic_opaque;
Test::Say(tostr() << "on_thread_start(" << thread_type << ", " << threadname
<< ") called\n");
threadcb->thread_start_cb(threadname);
return RD_KAFKA_RESP_ERR_NO_ERROR;
}
/**
* @brief C to C++ callback trampoline.
*/
static rd_kafka_resp_err_t on_thread_exit_trampoline(
rd_kafka_t *rk,
rd_kafka_thread_type_t thread_type,
const char *threadname,
void *ic_opaque) {
myThreadCb *threadcb = (myThreadCb *)ic_opaque;
Test::Say(tostr() << "on_thread_exit(" << thread_type << ", " << threadname
<< ") called\n");
threadcb->thread_exit_cb(threadname);
return RD_KAFKA_RESP_ERR_NO_ERROR;
}
/**
* @brief This interceptor is called when a new client instance is created
* prior to any threads being created.
* We use it to set up the instance's thread interceptors.
*/
static rd_kafka_resp_err_t on_new(rd_kafka_t *rk,
const rd_kafka_conf_t *conf,
void *ic_opaque,
char *errstr,
size_t errstr_size) {
Test::Say("on_new() interceptor called\n");
rd_kafka_interceptor_add_on_thread_start(
rk, "test:0100", on_thread_start_trampoline, ic_opaque);
rd_kafka_interceptor_add_on_thread_exit(rk, "test:0100",
on_thread_exit_trampoline, ic_opaque);
return RD_KAFKA_RESP_ERR_NO_ERROR;
}
/**
* @brief The on_conf_dup() interceptor let's use add the on_new interceptor
* in case the config object is copied, since interceptors are not
* automatically copied.
*/
static rd_kafka_resp_err_t on_conf_dup(rd_kafka_conf_t *new_conf,
const rd_kafka_conf_t *old_conf,
size_t filter_cnt,
const char **filter,
void *ic_opaque) {
Test::Say("on_conf_dup() interceptor called\n");
return rd_kafka_conf_interceptor_add_on_new(new_conf, "test:0100", on_new,
ic_opaque);
}
static void test_thread_cbs() {
RdKafka::Conf *conf = RdKafka::Conf::create(RdKafka::Conf::CONF_GLOBAL);
std::string errstr;
rd_kafka_conf_t *c_conf;
myThreadCb my_threads;
Test::conf_set(conf, "bootstrap.servers", "127.0.0.1:1");
/* Interceptors are not supported in the C++ API, instead use the C API:
* 1. Extract the C conf_t object
* 2. Set up an on_new() interceptor
* 3. Set up an on_conf_dup() interceptor to add interceptors in the
* case the config object is copied (which the C++ Conf always does).
* 4. In the on_new() interceptor, add the thread interceptors. */
c_conf = conf->c_ptr_global();
rd_kafka_conf_interceptor_add_on_new(c_conf, "test:0100", on_new,
&my_threads);
rd_kafka_conf_interceptor_add_on_conf_dup(c_conf, "test:0100", on_conf_dup,
&my_threads);
RdKafka::Producer *p = RdKafka::Producer::create(conf, errstr);
if (!p)
Test::Fail("Failed to create Producer: " + errstr);
p->poll(500);
delete conf;
delete p;
Test::Say(tostr() << my_threads.startCount() << " thread start calls, "
<< my_threads.exitCount() << " thread exit calls seen\n");
/* 3 = rdkafka main thread + internal broker + bootstrap broker */
if (my_threads.startCount() < 3)
Test::Fail("Did not catch enough thread start callback calls");
if (my_threads.exitCount() < 3)
Test::Fail("Did not catch enough thread exit callback calls");
if (my_threads.startCount() != my_threads.exitCount())
Test::Fail("Did not catch same number of start and exit callback calls");
}
extern "C" {
int main_0100_thread_interceptors(int argc, char **argv) {
test_thread_cbs();
return 0;
}
}
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