【RabbitMQ 项目】服务端：服务器模块

月夜星辉雪2024-09-27 7:03

文章目录

一.编写思路

成员变量：

  1. muduo 库中的 TCP 服务器
  2. EventLoop 对象：用于主线程循环监控连接事件
  3. 协议处理句柄
  4. 分发器：用于初始化协议处理器，便于把不同请求派发给不同的业务处理函数
  5. 连接管理句柄
  6. 虚拟机句柄
  7. 消费者管理句柄
  8. 线程池管理句柄
    成员方法：
    向外提供的只有 2 个方法：
  9. start：启动服务
  10. 构造函数：
  • 完成各项成员的初始化，
  • 注册 TCP 服务器的两个回调函数：
    OnMessage：从接收缓冲区把数据读到用户缓冲区后的回调函数
    OnConnection：Tcp 连接建立或断开时的回调函数
  • 给分发器注册业务处理函数(私有成员方法，共 12 个)
    信道打开与与关闭；交换机，队列，绑定添加与删除，订阅与取消订阅，发布与确认消息
    私有成员(业务处理函数)：
    如果是创建或关闭信道，直接用连接管理句柄新增或删除信道，然后构建响应返回
    如果是其他请求，先用连接管理句柄找到信道(请求中携带了信道 id)，再使用信道提供的服务

二.代码实践

BrokerServer.hpp:

cpp 复制代码 
#pragma once
#include "muduo/protobuf/codec.h"
#include "muduo/protobuf/dispatcher.h"
#include "muduo/base/Logging.h"
#include "muduo/base/Mutex.h"
#include "muduo/net/EventLoop.h"
#include "muduo/net/TcpServer.h"

#include "VirtualHost.hpp"
#include "Connection.hpp"
#include "Consumer.hpp"
#include <functional>
#include <stdio.h>
#include <unistd.h>

namespace ns_server
{
    using ConnectionManagerPtr = std::shared_ptr<ns_connection::ConnectionManager>;
    using VirtualHostPtr = std::shared_ptr<ns_data::VirtualHost>;
    using ConsumerManagerPtr = std::shared_ptr<ns_consumer::ConsumerManager>;
    using ThreadPoolPtr = std::shared_ptr<ns_tp::ThreadPool>;
    using ProtobufCodecPtr = std::shared_ptr<ProtobufCodec>;

    /************
     * 定义协议的结构化数据的智能指针(在分发器中注册时需要的格式)
     * *************/
    using OpenChannelRequestPtr = std::shared_ptr<ns_protocol::OpenChannelRequest>;
    using CloseChannelRequestPtr = std::shared_ptr<ns_protocol::CloseChannelRequest>;
    using DeclareExchangeRequestPtr = std::shared_ptr<ns_protocol::DeclareExchangeRequest>;
    using DeleteExchangeRequestPtr = std::shared_ptr<ns_protocol::DeleteExchangeRequest>;
    using DeclareMsgQueueRequestPtr = std::shared_ptr<ns_protocol::DeclareMsgQueueRequest>;
    using DeleteMsgQueueRequestPtr = std::shared_ptr<ns_protocol::DeleteMsgQueueRequest>;
    using BindRequestPtr = std::shared_ptr<ns_protocol::BindRequest>;
    using UnbindRequestPtr = std::shared_ptr<ns_protocol::UnbindRequest>;
    using PublishMessageRequestPtr = std::shared_ptr<ns_protocol::PublishMessageRequest>;

    using SubscribeQueueRequestPtr = std::shared_ptr<ns_protocol::SubscribeQueueRequest>;
    using CancelSubscribeRequestPtr = std::shared_ptr<ns_protocol::CancelSubscribeRequest>;
    using AckRequestPtr = std::shared_ptr<ns_protocol::AckRequest>;

    class BrokerServer
    {
    public:
    private:
        muduo::net::EventLoop _baseLoop;
        muduo::net::TcpServer _server;
        ProtobufDispatcher _dispatcher;
        ProtobufCodecPtr _codecPtr;
        VirtualHostPtr _vhPtr;
        ConsumerManagerPtr _consumerManagerPtr;
        ConnectionManagerPtr _connManagerPtr;
        ThreadPoolPtr _threadPoolPtr;

    public:
        BrokerServer(int serverPort, const std::string &dbName, const std::string &msgDir)
            : _baseLoop(),
              _server(&_baseLoop, muduo::net::InetAddress("0.0.0.0", serverPort), "TcpServer", muduo::net::TcpServer::kReusePort),
              _dispatcher(std::bind(&BrokerServer::onUnknownMessage, this, std::placeholders::_1,
                                    std::placeholders::_2, std::placeholders::_3))
        {
            // 初始化成员
            _codecPtr = std::make_shared<ProtobufCodec>(std::bind(&ProtobufDispatcher::onProtobufMessage,
                                                                  &_dispatcher, std::placeholders::_1,
                                                                  std::placeholders::_2, std::placeholders::_3));
            _vhPtr = std::make_shared<ns_data::VirtualHost>(dbName, msgDir);

            _threadPoolPtr = std::make_shared<ns_tp::ThreadPool>();
            _threadPoolPtr->start();

            std::vector<std::string> qnames;
            _vhPtr->getAllQueueName(&qnames);
            _consumerManagerPtr = std::make_shared<ns_consumer::ConsumerManager>(qnames);

            _connManagerPtr = std::make_shared<ns_connection::ConnectionManager>();

            // 给_server注册两个回调函数
            _server.setConnectionCallback(std::bind(&BrokerServer::onConnection, this, std::placeholders::_1));
            _server.setMessageCallback(std::bind(&ProtobufCodec::onMessage, _codecPtr.get(), std::placeholders::_1,
                                                 std::placeholders::_2, std::placeholders::_3));

            // 给分发器注册业务处理函数
            _dispatcher.registerMessageCallback<ns_protocol::OpenChannelRequest>(std::bind(&BrokerServer::onOpenChannel,
                                                                                           this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

            _dispatcher.registerMessageCallback<ns_protocol::CloseChannelRequest>(std::bind(&BrokerServer::onCloseChannel,
                                                                                            this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

            _dispatcher.registerMessageCallback<ns_protocol::DeclareExchangeRequest>(std::bind(&BrokerServer::onDeclareExchange,
                                                                                               this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

            _dispatcher.registerMessageCallback<ns_protocol::DeleteExchangeRequest>(std::bind(&BrokerServer::onDeleteExchange,
                                                                                              this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

            _dispatcher.registerMessageCallback<ns_protocol::DeclareMsgQueueRequest>(std::bind(&BrokerServer::onDeclareMsgQueue,
                                                                                               this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

            _dispatcher.registerMessageCallback<ns_protocol::DeleteMsgQueueRequest>(std::bind(&BrokerServer::onDeleteMsgQueue,
                                                                                              this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

            _dispatcher.registerMessageCallback<ns_protocol::BindRequest>(std::bind(&BrokerServer::onBind,
                                                                                    this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

            _dispatcher.registerMessageCallback<ns_protocol::UnbindRequest>(std::bind(&BrokerServer::onUnbind,
                                                                                      this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

            _dispatcher.registerMessageCallback<ns_protocol::SubscribeQueueRequest>(std::bind(&BrokerServer::onSubScribe,
                                                                                              this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

            _dispatcher.registerMessageCallback<ns_protocol::CancelSubscribeRequest>(std::bind(&BrokerServer::onCancelSubScribe,
                                                                                               this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

            _dispatcher.registerMessageCallback<ns_protocol::PublishMessageRequest>(std::bind(&BrokerServer::onPublishMessage,
                                                                                              this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

            _dispatcher.registerMessageCallback<ns_protocol::AckRequest>(std::bind(&BrokerServer::onAck,
                                                                                   this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
        }

        void start()
        {
            // 开启监听状态
            _server.start();
            // 开始循环监控事件
            _baseLoop.loop();
        }

    private:
        // 给TcpServer设置的回调函数
        void onConnection(const muduo::net::TcpConnectionPtr &connPtr)
        {
            if (connPtr->connected())
            {
                _connManagerPtr->newConnection(connPtr, _codecPtr, _vhPtr, _consumerManagerPtr, _threadPoolPtr);
            }
            else
            {
                _connManagerPtr->deleteConnection(connPtr);
            }
        }

        // 业务处理函数
        void onUnknownMessage(const muduo::net::TcpConnectionPtr &connPtr, MessagePtr msgPtr, muduo::Timestamp time)
        {
            cout << "未知消息" << endl;
            connPtr->shutdown();
        }

        /************
         * 信道创建与删除
         * ***************/
        void onOpenChannel(const muduo::net::TcpConnectionPtr &connPtr, const OpenChannelRequestPtr &reqPtr, muduo::Timestamp time)
        {
            auto myConnPtr = _connManagerPtr->getConnection(connPtr);
            if (myConnPtr == nullptr)
            {
                LOG(WARNING) << "打开信道时, 未找到Connection" << endl;
                return;
            }
            myConnPtr->openChannel(*reqPtr);
            LOG(DEBUG) << "create new channel, channelId: " << reqPtr->channel_id() << endl;
        }

        void onCloseChannel(const muduo::net::TcpConnectionPtr &connPtr, const CloseChannelRequestPtr &reqPtr, muduo::Timestamp time)
        {
            auto myConnPtr = _connManagerPtr->getConnection(connPtr);
            if (myConnPtr == nullptr)
            {
                LOG(WARNING) << "关闭信道时, 未找到Connection" << endl;
                return;
            }
            myConnPtr->closeChannel(*reqPtr);
            LOG(DEBUG) << "close channel, channelId: " << reqPtr->channel_id() << endl;
        }

        /*********
         * 交换机声明与删除
         * ********/
        void onDeclareExchange(const muduo::net::TcpConnectionPtr &connPtr, const DeclareExchangeRequestPtr &reqPtr, muduo::Timestamp time)
        {
            auto myConnPtr = _connManagerPtr->getConnection(connPtr);
            if (myConnPtr == nullptr)
            {
                LOG(WARNING) << "声明交换机时, 未找到Connection" << endl;
                return;
            }

            auto channelPtr = myConnPtr->getChannel(reqPtr->channel_id());
            if (channelPtr == nullptr)
            {
                LOG(WARNING) << "没有找到信道" << endl;
                return;
            }

            channelPtr->declareExchange(*reqPtr);
            LOG(DEBUG) << "声明交换机, exchangeName: " << reqPtr->exchange_name() << endl;
        }

        void onDeleteExchange(const muduo::net::TcpConnectionPtr &connPtr, const DeleteExchangeRequestPtr &reqPtr, muduo::Timestamp time)
        {
            auto myConnPtr = _connManagerPtr->getConnection(connPtr);
            if (myConnPtr == nullptr)
            {
                LOG(WARNING) << "删除交换机时, 未找到Connection" << endl;
                return;
            }

            auto channelPtr = myConnPtr->getChannel(reqPtr->channel_id());
            if (channelPtr == nullptr)
            {
                LOG(WARNING) << "没有找到信道" << endl;
                return;
            }

            channelPtr->deleteExchange(*reqPtr);
            LOG(DEBUG) << "删除信道, exchangeName: " << reqPtr->exchange_name() << endl;
        }

        /************
         * 队列声明与删除
         * ***************/
        void onDeclareMsgQueue(const muduo::net::TcpConnectionPtr &connPtr, const DeclareMsgQueueRequestPtr &reqPtr, muduo::Timestamp time)
        {
            auto myConnPtr = _connManagerPtr->getConnection(connPtr);
            if (myConnPtr == nullptr)
            {
                LOG(WARNING) << "声明队列时, 未找到Connection" << endl;
                return;
            }

            auto channelPtr = myConnPtr->getChannel(reqPtr->channel_id());
            if (channelPtr == nullptr)
            {
                LOG(WARNING) << "没有找到信道" << endl;
                return;
            }

            channelPtr->declareMsgQueue(*reqPtr);
            LOG(DEBUG) << "声明队列, queueName: " << reqPtr->queue_name() << endl;
        }

        void onDeleteMsgQueue(const muduo::net::TcpConnectionPtr &connPtr, const DeleteMsgQueueRequestPtr &reqPtr, muduo::Timestamp time)
        {
            auto myConnPtr = _connManagerPtr->getConnection(connPtr);
            if (myConnPtr == nullptr)
            {
                LOG(WARNING) << "删除队列时, 未找到Connection" << endl;
                return;
            }

            auto channelPtr = myConnPtr->getChannel(reqPtr->channel_id());
            if (channelPtr == nullptr)
            {
                LOG(WARNING) << "没有找到信道" << endl;
                return;
            }

            channelPtr->deleteMsgQueue(*reqPtr);
            LOG(DEBUG) << "删除队列, queueName: " << reqPtr->queue_name() << endl;
        }

        /**********
         * 绑定与解绑
         * ***********/
        void onBind(const muduo::net::TcpConnectionPtr &connPtr, const BindRequestPtr &reqPtr, muduo::Timestamp time)
        {
            auto myConnPtr = _connManagerPtr->getConnection(connPtr);
            if (myConnPtr == nullptr)
            {
                LOG(WARNING) << "添加绑定时, 未找到Connection" << endl;
                return;
            }

            auto channelPtr = myConnPtr->getChannel(reqPtr->channel_id());
            if (channelPtr == nullptr)
            {
                LOG(WARNING) << "没有找到信道" << endl;
                return;
            }

            channelPtr->bind(*reqPtr);
            LOG(DEBUG) << "绑定: " << reqPtr->ename() << "->" << reqPtr->qname() << ": " << reqPtr->binding_key() << endl;
        }
        void onUnbind(const muduo::net::TcpConnectionPtr &connPtr, const UnbindRequestPtr &reqPtr, muduo::Timestamp time)
        {
            auto myConnPtr = _connManagerPtr->getConnection(connPtr);
            if (myConnPtr == nullptr)
            {
                LOG(WARNING) << "删除绑定时, 未找到Connection" << endl;
                return;
            }

            auto channelPtr = myConnPtr->getChannel(reqPtr->channel_id());
            if (channelPtr == nullptr)
            {
                LOG(WARNING) << "没有找到信道" << endl;
                return;
            }

            channelPtr->unbind(*reqPtr);
            LOG(DEBUG) << "解绑: " << reqPtr->ename() << "->" << reqPtr->qname() << endl;
        }

        /*************
         * 订阅与取消订阅
         * ************/
        void onSubScribe(const muduo::net::TcpConnectionPtr &connPtr, const SubscribeQueueRequestPtr &reqPtr, muduo::Timestamp time)
        {
            auto myConnPtr = _connManagerPtr->getConnection(connPtr);
            if (myConnPtr == nullptr)
            {
                LOG(WARNING) << "订阅队列时, 未找到Connection" << endl;
                return;
            }

            auto channelPtr = myConnPtr->getChannel(reqPtr->channel_id());
            if (channelPtr == nullptr)
            {
                LOG(WARNING) << "没有找到信道" << endl;
                return;
            }

            channelPtr->subscribeQueue(*reqPtr);
            LOG(DEBUG) << "订阅队列" << ", qname: " << reqPtr->qname() << endl;
        }

        void onCancelSubScribe(const muduo::net::TcpConnectionPtr &connPtr, const CancelSubscribeRequestPtr &reqPtr, muduo::Timestamp time)
        {
            auto myConnPtr = _connManagerPtr->getConnection(connPtr);
            if (myConnPtr == nullptr)
            {
                LOG(WARNING) << "取消订阅队列时, 未找到Connection" << endl;
                return;
            }

            auto channelPtr = myConnPtr->getChannel(reqPtr->channel_id());
            if (channelPtr == nullptr)
            {
                LOG(WARNING) << "没有找到信道" << endl;
                return;
            }

            channelPtr->cancelSubscribe(*reqPtr);
            LOG(DEBUG) << "取消订阅队列" << ", qname: " << reqPtr->qname() << endl;
        }

        /********
         * 发布与应答
         * **************/
        void onPublishMessage(const muduo::net::TcpConnectionPtr &connPtr, const PublishMessageRequestPtr &reqPtr, muduo::Timestamp time)
        {
            auto myConnPtr = _connManagerPtr->getConnection(connPtr);
            if (myConnPtr == nullptr)
            {
                LOG(WARNING) << "发布消息时, 未找到Connection" << endl;
                return;
            }

            auto channelPtr = myConnPtr->getChannel(reqPtr->channel_id());
            if (channelPtr == nullptr)
            {
                LOG(WARNING) << "没有找到信道" << endl;
                return;
            }

            channelPtr->publishMessage(*reqPtr);
            LOG(DEBUG) << "publish message: " << reqPtr->msg().saved_info().body() << endl;
        }

        void onAck(const muduo::net::TcpConnectionPtr &connPtr, const AckRequestPtr &reqPtr, muduo::Timestamp time)
        {
            auto myConnPtr = _connManagerPtr->getConnection(connPtr);
            if (myConnPtr == nullptr)
            {
                LOG(WARNING) << "确认消息时, 未找到Connection" << endl;
                return;
            }

            auto channelPtr = myConnPtr->getChannel(reqPtr->channel_id());
            if (channelPtr == nullptr)
            {
                LOG(WARNING) << "没有找到信道" << endl;
                return;
            }

            channelPtr->ackMessage(*reqPtr);
            LOG(DEBUG) << "应答消息, msgId: " << reqPtr->msg_id() << endl;
        }

        void sendCommonResponse(const muduo::net::TcpConnectionPtr &connPtr, const std::string &channelId,
                                const std::string &responseId, bool ok)
        {
            ns_protocol::CommomResponse resp;
            resp.set_channel_id(channelId);
            resp.set_response_id(responseId);
            resp.set_ok(ok);
            _codecPtr->send(connPtr, resp);
        }
    };
}

三.服务端模块关系总结

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