0078-c_from_cpp.cpp

/*
 * librdkafka - Apache Kafka C library
 *
 * Copyright (c) 2016, 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 "rdkafka.h" /* Include before rdkafkacpp.h (from testcpp.h) */
#include "testcpp.h"
#include <cstring>

/**
 * @name Verify that the c_ptr()'s returned from C++ can be used
 *       to interact directly with the C API.
 */


extern "C" {
  int main_0078_c_from_cpp (int argc, char **argv) {
    RdKafka::Conf *conf = RdKafka::Conf::create(RdKafka::Conf::CONF_GLOBAL);

    std::string errstr;

    if (conf->set("client.id", "myclient", errstr))
      Test::Fail("conf->set() failed: " + errstr);

    RdKafka::Producer *p = RdKafka::Producer::create(conf, errstr);
    if (!p)
      Test::Fail("Failed to create Producer: " + errstr);

    delete conf;

    /*
     * Acquire rd_kafka_t and compare its name to the configured client.id
     */
    rd_kafka_t *rk = p->c_ptr();
    if (!rk)
      Test::Fail("Failed to acquire c_ptr");

    std::string name = p->name();
    std::string c_name = rd_kafka_name(rk);

    Test::Say("Compare C name " + c_name + " to C++ name " + name + "\n");
    if (c_name != name)
      Test::Fail("Expected C client name " + c_name + " to match C++ " + name);

    /*
     * Create topic object, acquire rd_kafka_topic_t and compare
     * its topic name.
     */

    RdKafka::Topic *topic = RdKafka::Topic::create(p, "mytopic", NULL, errstr);
    if (!topic)
      Test::Fail("Failed to create Topic: " + errstr);

    rd_kafka_topic_t *rkt = topic->c_ptr();
    if (!rkt)
      Test::Fail("Failed to acquire topic c_ptr");

    std::string topicname = topic->name();
    std::string c_topicname = rd_kafka_topic_name(rkt);

    Test::Say("Compare C topic " + c_topicname + " to C++ topic " + topicname + "\n");
    if (c_topicname != topicname)
      Test::Fail("Expected C topic " + c_topicname + " to match C++ topic " + topicname);

    delete topic;
    delete p;

    return 0;
  }
}