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/*
* librdkafka - Apache Kafka C/C++ library
*
* 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.
*/
#include <iostream>
#include <string>
#include <list>
#include <cerrno>
#include "rdkafkacpp_int.h"
RdKafka::Consumer::~Consumer() {
}
RdKafka::Consumer *RdKafka::Consumer::create(const RdKafka::Conf *conf,
std::string &errstr) {
char errbuf[512];
const RdKafka::ConfImpl *confimpl =
dynamic_cast<const RdKafka::ConfImpl *>(conf);
RdKafka::ConsumerImpl *rkc = new RdKafka::ConsumerImpl();
rd_kafka_conf_t *rk_conf = NULL;
if (confimpl) {
if (!confimpl->rk_conf_) {
errstr = "Requires RdKafka::Conf::CONF_GLOBAL object";
delete rkc;
return NULL;
}
rkc->set_common_config(confimpl);
rk_conf = rd_kafka_conf_dup(confimpl->rk_conf_);
}
rd_kafka_t *rk;
if (!(rk =
rd_kafka_new(RD_KAFKA_CONSUMER, rk_conf, errbuf, sizeof(errbuf)))) {
errstr = errbuf;
// rd_kafka_new() takes ownership only if succeeds
if (rk_conf)
rd_kafka_conf_destroy(rk_conf);
delete rkc;
return NULL;
}
rkc->rk_ = rk;
return rkc;
}
int64_t RdKafka::Consumer::OffsetTail(int64_t offset) {
return RD_KAFKA_OFFSET_TAIL(offset);
}
RdKafka::ErrorCode RdKafka::ConsumerImpl::start(Topic *topic,
int32_t partition,
int64_t offset) {
RdKafka::TopicImpl *topicimpl = dynamic_cast<RdKafka::TopicImpl *>(topic);
if (rd_kafka_consume_start(topicimpl->rkt_, partition, offset) == -1)
return static_cast<RdKafka::ErrorCode>(rd_kafka_last_error());
return RdKafka::ERR_NO_ERROR;
}
RdKafka::ErrorCode RdKafka::ConsumerImpl::start(Topic *topic,
int32_t partition,
int64_t offset,
Queue *queue) {
RdKafka::TopicImpl *topicimpl = dynamic_cast<RdKafka::TopicImpl *>(topic);
RdKafka::QueueImpl *queueimpl = dynamic_cast<RdKafka::QueueImpl *>(queue);
if (rd_kafka_consume_start_queue(topicimpl->rkt_, partition, offset,
queueimpl->queue_) == -1)
return static_cast<RdKafka::ErrorCode>(rd_kafka_last_error());
return RdKafka::ERR_NO_ERROR;
}
RdKafka::ErrorCode RdKafka::ConsumerImpl::stop(Topic *topic,
int32_t partition) {
RdKafka::TopicImpl *topicimpl = dynamic_cast<RdKafka::TopicImpl *>(topic);
if (rd_kafka_consume_stop(topicimpl->rkt_, partition) == -1)
return static_cast<RdKafka::ErrorCode>(rd_kafka_last_error());
return RdKafka::ERR_NO_ERROR;
}
RdKafka::ErrorCode RdKafka::ConsumerImpl::seek(Topic *topic,
int32_t partition,
int64_t offset,
int timeout_ms) {
RdKafka::TopicImpl *topicimpl = dynamic_cast<RdKafka::TopicImpl *>(topic);
if (rd_kafka_seek(topicimpl->rkt_, partition, offset, timeout_ms) == -1)
return static_cast<RdKafka::ErrorCode>(rd_kafka_last_error());
return RdKafka::ERR_NO_ERROR;
}
RdKafka::Message *RdKafka::ConsumerImpl::consume(Topic *topic,
int32_t partition,
int timeout_ms) {
RdKafka::TopicImpl *topicimpl = dynamic_cast<RdKafka::TopicImpl *>(topic);
rd_kafka_message_t *rkmessage;
rkmessage = rd_kafka_consume(topicimpl->rkt_, partition, timeout_ms);
if (!rkmessage)
return new RdKafka::MessageImpl(
RD_KAFKA_CONSUMER, topic,
static_cast<RdKafka::ErrorCode>(rd_kafka_last_error()));
return new RdKafka::MessageImpl(RD_KAFKA_CONSUMER, topic, rkmessage);
}
namespace {
/* Helper struct for `consume_callback'.
* Encapsulates the values we need in order to call `rd_kafka_consume_callback'
* and keep track of the C++ callback function and `opaque' value.
*/
struct ConsumerImplCallback {
ConsumerImplCallback(RdKafka::Topic *topic,
RdKafka::ConsumeCb *cb,
void *data) :
topic(topic), cb_cls(cb), cb_data(data) {
}
/* This function is the one we give to `rd_kafka_consume_callback', with
* the `opaque' pointer pointing to an instance of this struct, in which
* we can find the C++ callback and `cb_data'.
*/
static void consume_cb_trampoline(rd_kafka_message_t *msg, void *opaque) {
ConsumerImplCallback *instance =
static_cast<ConsumerImplCallback *>(opaque);
RdKafka::MessageImpl message(RD_KAFKA_CONSUMER, instance->topic, msg,
false /*don't free*/);
instance->cb_cls->consume_cb(message, instance->cb_data);
}
RdKafka::Topic *topic;
RdKafka::ConsumeCb *cb_cls;
void *cb_data;
};
} // namespace
int RdKafka::ConsumerImpl::consume_callback(RdKafka::Topic *topic,
int32_t partition,
int timeout_ms,
RdKafka::ConsumeCb *consume_cb,
void *opaque) {
RdKafka::TopicImpl *topicimpl = static_cast<RdKafka::TopicImpl *>(topic);
ConsumerImplCallback context(topic, consume_cb, opaque);
return rd_kafka_consume_callback(topicimpl->rkt_, partition, timeout_ms,
&ConsumerImplCallback::consume_cb_trampoline,
&context);
}
RdKafka::Message *RdKafka::ConsumerImpl::consume(Queue *queue, int timeout_ms) {
RdKafka::QueueImpl *queueimpl = dynamic_cast<RdKafka::QueueImpl *>(queue);
rd_kafka_message_t *rkmessage;
rkmessage = rd_kafka_consume_queue(queueimpl->queue_, timeout_ms);
if (!rkmessage)
return new RdKafka::MessageImpl(
RD_KAFKA_CONSUMER, NULL,
static_cast<RdKafka::ErrorCode>(rd_kafka_last_error()));
/*
* Recover our Topic * from the topic conf's opaque field, which we
* set in RdKafka::Topic::create() for just this kind of situation.
*/
void *opaque = rd_kafka_topic_opaque(rkmessage->rkt);
Topic *topic = static_cast<Topic *>(opaque);
return new RdKafka::MessageImpl(RD_KAFKA_CONSUMER, topic, rkmessage);
}
namespace {
/* Helper struct for `consume_callback' with a Queue.
* Encapsulates the values we need in order to call `rd_kafka_consume_callback'
* and keep track of the C++ callback function and `opaque' value.
*/
struct ConsumerImplQueueCallback {
ConsumerImplQueueCallback(RdKafka::ConsumeCb *cb, void *data) :
cb_cls(cb), cb_data(data) {
}
/* This function is the one we give to `rd_kafka_consume_callback', with
* the `opaque' pointer pointing to an instance of this struct, in which
* we can find the C++ callback and `cb_data'.
*/
static void consume_cb_trampoline(rd_kafka_message_t *msg, void *opaque) {
ConsumerImplQueueCallback *instance =
static_cast<ConsumerImplQueueCallback *>(opaque);
/*
* Recover our Topic * from the topic conf's opaque field, which we
* set in RdKafka::Topic::create() for just this kind of situation.
*/
void *topic_opaque = rd_kafka_topic_opaque(msg->rkt);
RdKafka::Topic *topic = static_cast<RdKafka::Topic *>(topic_opaque);
RdKafka::MessageImpl message(RD_KAFKA_CONSUMER, topic, msg,
false /*don't free*/);
instance->cb_cls->consume_cb(message, instance->cb_data);
}
RdKafka::ConsumeCb *cb_cls;
void *cb_data;
};
} // namespace
int RdKafka::ConsumerImpl::consume_callback(Queue *queue,
int timeout_ms,
RdKafka::ConsumeCb *consume_cb,
void *opaque) {
RdKafka::QueueImpl *queueimpl = dynamic_cast<RdKafka::QueueImpl *>(queue);
ConsumerImplQueueCallback context(consume_cb, opaque);
return rd_kafka_consume_callback_queue(
queueimpl->queue_, timeout_ms,
&ConsumerImplQueueCallback::consume_cb_trampoline, &context);
}
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