Rabbitmq C++客户端 Rabbitmq Client

概述

最近项目消息队列服务选用了rabbitmq，server端用的C++开发的，于是需要开发rabbitmq的c++客户端，国际惯例先百度了一圈，然后github搜了一圈，竟然发现排名靠前的需要付费才能使用，尼玛这都拿出来骗钱(愤青了)，于是产生了写个客户端给大家使用的念头。

我的应用场景是这样的生产者是用java写的(java别说了，一搜一大堆，改个服务器地址就能用)，服务端作为消费者，老本行用的C++开发的，只需写个c++的rabbitmq客户端嵌入到我的server里就行，所有的消费者监听的一个队列，无需指定routing key和exchange，任何一个消费者消费到数据就行(我的服务端是个集群)。话不多说上代码。

实现

我的环境是Linux centos7.2

amqpclient.cpp源码如下：

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>

#include "amqp_tcp_socket.h"
#include "amqp.h"
#include "amqp_framing.h"
#include "utils.h"
#include "platform_utils.h"
#include "amqpclient.h"

/*
* 构造函数
* hostname,port,user,pwd,vhost
*/

AmqpClient::AmqpClient(const char* hostname, const int port, const char* user,
const char* pwd, const char* vhost, const char* queuename)
{
    if((hostname != NULL) || (port != 0) || (user != NULL)
    || (pwd != NULL) || (vhost != NULL) || (queuename != NULL))
    {
        strcpy(this->m_hostname, hostname);
        this->m_port = port;
        strcpy(this->m_user, user);
        strcpy(this->m_pwd, pwd);
        strcpy(this->m_vhost, vhost);
        strcpy(this->m_queuename, queuename);
    }
}

bool AmqpClient::ConnectRabbitmq()
{
    amqp_socket_t *socket ;
    amqp_rpc_reply_t reply ;
    int status;

    conn = amqp_new_connection();
    socket = amqp_tcp_socket_new(conn);
    if(!socket)
    {
        printf("amqp new socket error\n");
        return 0;
    }
    status = amqp_socket_open(socket, m_hostname, m_port);
    if(status)
    {
        printf("amqp open socket error\n");
        return 0;
    }
    reply = amqp_login(conn, m_vhost, 0, 131072, 0, AMQP_SASL_METHOD_PLAIN, m_user, m_pwd);
    if (reply.reply_type == AMQP_RESPONSE_SERVER_EXCEPTION)
    {
        printf("amqp login error\n");
        return 0;
    }
    amqp_channel_open(conn, 1);
    reply = amqp_get_rpc_reply(conn);
    if(reply.reply_type == AMQP_RESPONSE_SERVER_EXCEPTION)
    {
        printf("ConnectRabbitmq::amqp get rpc_reply error\n");
        return 0;
    }
}

bool AmqpClient::StartConsumer()
{
    amqp_rpc_reply_t reply ;
    //自动回复ACK
    amqp_basic_consume(conn, 1, amqp_cstring_bytes(m_queuename), amqp_empty_bytes, 0, 1, 0, amqp_empty_table);
    reply = amqp_get_rpc_reply(conn);
    if(reply.reply_type == AMQP_RESPONSE_SERVER_EXCEPTION)
    {
        printf("StartConsumer::amqp get rpc_reply error\n");
        return false;
    }
    {
        for (;;)
        {
            amqp_rpc_reply_t res;
            amqp_envelope_t envelope;

            amqp_maybe_release_buffers(conn);

            res = amqp_consume_message(conn, &envelope, NULL, 0);

            if (AMQP_RESPONSE_NORMAL != res.reply_type) {
                break;
            }

            printf("Delivery %u, exchange %.*s routingkey %.*s\n",
                    (unsigned) envelope.delivery_tag,
                    (int) envelope.exchange.len, (char *) envelope.exchange.bytes,
                    (int) envelope.routing_key.len, (char *) envelope.routing_key.bytes);

            if (envelope.message.properties._flags & AMQP_BASIC_CONTENT_TYPE_FLAG) {
                printf("Content-type: %.*s\n",
                    (int) envelope.message.properties.content_type.len,
                    (char *) envelope.message.properties.content_type.bytes);
            }
            printf("----\n");

            amqp_dump(envelope.message.body.bytes, envelope.message.body.len);

            amqp_destroy_envelope(&envelope);
        }
    }
}

void AmqpClient::CloseConnect()
{
    amqp_rpc_reply_t reply ;
    amqp_channel_close(conn, 1, AMQP_REPLY_SUCCESS);
    amqp_connection_close(conn, AMQP_REPLY_SUCCESS);
    amqp_destroy_connection(conn);
}

amqpclient.h源码如下：

#ifndef _AMQPCLIENT_H
#define _AMQPCLIENT_H

#include "amqp.h"

class AmqpClient
{
public:
    AmqpClient(const char* hostname, const int port, const char* user, const char* pwd,
    const char* vhost, const char* queuename);
    bool ConnectRabbitmq();
    bool StartConsumer();
    void CloseConnect();
private:
    amqp_connection_state_t conn = NULL;
    char m_hostname[128];
    int  m_port;
    char m_user[128];
    char m_pwd[128];
    char m_vhost[128];
    char m_queuename[128];
};

#endif

main.cpp源码如下：

#include <stdio.h>
#include "amqpclient.h"

int main()
{
    const char* hostname = "192.168.12.20";
    const int   port = 5672;
    const char* user = "woniu201";
    const char* pwd  = "woniu201";
    const char* vhost = "/";
    const char* queuename = "queuename001";

    AmqpClient amqpClient(hostname, port, user, pwd, vhost, queuename);
    amqpClient.ConnectRabbitmq();
    printf("connect rabbitmq succ, is consuming!\n");
    amqpClient.StartConsumer();

    return 1;
}

Makefile文件：

EXE=rabbitmq_consumer
SUBDIR=src

#CXXFLAGS:编译选项, LDFLAGS:链接选项
CXXFLAGS +=
LDFLAGS += -L/usr/local/lib -lrabbitmq

CXX_SOURCES =$(foreach dir,$(SUBDIR), $(wildcard $(dir)/*.cpp))
CXX_OBJECTS=$(patsubst  %.cpp, %.o, $(CXX_SOURCES))
DEP_FILES  =$(patsubst  %.o,  %.d, $(CXX_OBJECTS))

$(EXE): $(CXX_OBJECTS)
	g++  $(CXX_OBJECTS) -o $(EXE) $(LDFLAGS)

%.o: %.cpp
	g++  -c  $(CXXFLAGS) -MMD $<  -o  $@

-include $(DEP_FILES)

clean:
	rm  -rf  $(CXX_OBJECTS)  $(DEP_FILES)  $(EXE)

test:
	echo $(CXX_OBJECTS)

initlib:
	ln -s lib/librabbitmq.so.4.2.0 /usr/local/lib/librabbitmq.so
	ln -s lib/librabbitmq.so.4.2.0 /usr/lib64/librabbitmq.so.4
	

这里用到了librabbitmq.so.4动态库，make前先执行make initlib指令，会把所用的librabbitmq.so库放到系统环境中。

make完后会生产rabbitmq_consumer可执行文件，./rabbitmq_consumer执行。

测试结果如下：

如果到这里还有问题可以直接下载我的源码或者留言交流：http://download.csdn.net/detail/woniu211111/9911075

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