c++使用libhv实现TCP客户端服务端长连接(带有心跳包回复)

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利用libhv三方通信库实现tcp客户端、服务端长连接功能，带有心跳包回复，由于hvlib是在时间中创建的hio对象，如果程序是带有界面，直接用单线程创建hio即可，使用单线程对接收到的数据通过std::function发送到界面进行显示
[libhv源码地址](https://download.csdn.net/download/Pailugou/64827333)
[libhv编译windows 64库地址](https://download.csdn.net/download/Pailugou/64827902)
server端：
#pragma once
#include <iostream>
#include <functional>
#include <mutex>
#include "hvlib/include/hv/hloop.h"

class HVTcpServer
{
public:
	typedef struct
	{
		std::string cmd;
		int len;
		std::string message;
	}MessageData;
	explicit HVTcpServer();
	~HVTcpServer();

	void openServer(const std::size_t port, const std::string ip);

	void sendMessage(const std::string message);

	void setDataCB(std::function<void(std::string)>);
private:
	void initHV();

	static void acceptCallBack(hio_t* io);

	static void hio_closeConnect(hio_t* io);

	static void hio_readMessage(hio_t* io, void* buf, int readBytes);

	static void hio_heart_beat(hio_t* io);

	static void hio_sendMessage(hio_t* io, const void* buf, int writeBytes);

	void dataCB();
private:
	std::size_t m_iPort;

	std::string m_strIP;

	hio_t* m_pHIO;

	std::function<void(std::string)> m_pDataCB;
};
#include "HVTcpServer.h"
#include <thread>
#include <vector>
#include <QByteArray>

std::vector<std::string> g_DataVec;
std::mutex g_mutx;

hio_t* g_hio;
#define CMD_HreatBeat "ServerBackHreatBeat"
#define CMD_SendMessage 0x01
HVTcpServer::HVTcpServer()
{
	//initHV();
}

HVTcpServer::~HVTcpServer()
{
	
}

void HVTcpServer::openServer(const std::size_t port, const std::string ip)
{
	m_iPort = port;
	m_strIP = ip;
	std::thread runIOThread(&HVTcpServer::initHV, this);
	runIOThread.detach();

	std::thread sendData(&HVTcpServer::dataCB, this);
	sendData.detach();
}

void HVTcpServer::initHV()
{
	std::unique_lock<std::mutex> lock(g_mutx);
	g_DataVec.clear();
	lock.unlock();
	hloop_t* pLoop = hloop_new();
	m_pHIO = hloop_create_tcp_server(pLoop, m_strIP.c_str(), m_iPort, HVTcpServer::acceptCallBack);
	hloop_run(pLoop);
	hloop_free(&pLoop);

	std::cout << "hclib 初始化完成" << std::endl;
}

void HVTcpServer::acceptCallBack(hio_t* io)
{
	g_hio = io;
	std::cout << hio_fd(io) << std::endl;
	std::cout << "-----connect success" << std::endl;
	hio_setcb_close(io, HVTcpServer::hio_closeConnect);

	hio_setcb_read(io, HVTcpServer::hio_readMessage);
	//hio_set_heartbeat(io, 400, HVTcpServer::hio_heart_beat);

	//hio_setcb_write(io, HVTcpServer::hio_sendMessage);

	//hio_set_keepalive_timeout(io, 5000);

	hio_read(io);

}

void HVTcpServer::hio_closeConnect(hio_t* io)
{
	std::unique_lock<std::mutex> lock(g_mutx);
	g_DataVec.clear();
	lock.unlock();
	hio_close(io);

	std::cout << hio_fd(io)<<"-----close connect" << std::endl;
}

void HVTcpServer::hio_readMessage(hio_t* io, void* buf, int readBytes)
{
	std::cout << hio_fd(io) << std::endl;
	const char* data = /*reinterpret_cast<char*>*/(char*)(buf);
	std::string msg(data, static_cast<std::size_t>(readBytes));
	if (msg.size() == 0)return;
	std::cout << msg.c_str() << std::endl;
	std::lock_guard<std::mutex> lock(g_mutx);
	g_DataVec.emplace_back(msg);
	if (msg.compare("ClientHreatbeat") == 0)
	{
		hio_write(io, CMD_HreatBeat, strlen(CMD_HreatBeat));
	}
	else
	{
		std::cout << "send:" << data << std::endl;
	}


	fflush(stdout);
}

void HVTcpServer::hio_heart_beat(hio_t* io)
{
	hio_write(io, "server hreat beat", strlen("server hreat beat"));
}

void HVTcpServer::hio_sendMessage(hio_t* io, const void* buf, int writeBytes) 
{
	std::cout << hio_fd(io) << std::endl;
	std::cout << "send hio" << std::endl;
	//hio_write(io, m_strSendMessage, writeBytes);
}

void HVTcpServer::sendMessage(const std::string message)
{
	std::string str = message;
	//void* vp = const_cast<void*>(&str);
	hio_write(g_hio, str.c_str(), strlen(message.c_str()));
}

void HVTcpServer::dataCB()
{
	while (true)
	{
		if (g_DataVec.empty())continue;
		std::this_thread::sleep_for(std::chrono::milliseconds(200));
		std::unique_lock<std::mutex> lock(g_mutx);
		if (m_pDataCB)
			m_pDataCB(g_DataVec.front());
		g_DataVec.erase(g_DataVec.begin());
		lock.unlock();
	}
}

void HVTcpServer::setDataCB(std::function<void(std::string)> cb)
{
	this->m_pDataCB = cb;
}

client端：
#pragma once
#include "hloop.h"
#include <iostream>
#include <functional>
#include <thread>
#include <mutex>
#include <vector>


class HVTcpClient
{
public:
	explicit HVTcpClient();
	~HVTcpClient();

	//开启hio
	void setNetInfo(const std::size_t port, const std::string ip);

	//发送消息
	void sendMessage(const std::string message);

	//是否开启心跳
	void openHreatBeat(const bool status);

	//设置数据回调接口
	void setDataCB(std::function<void (std::string)>);
private:
	void initHV();

	//连接成功接口
	static void hioConnect(hio_t* io);

	//心跳回调接口
	static void hioHreatBeat(hio_t* io);

	//接受数据回调接口
	static void hioRecv(hio_t* io, void* buf, int readBytes);

	//关闭回调接口
	static void hioClose(hio_t* io);

	static void hioHRead(hio_t*, void* buf, int bytes);

	//单线程将接收到的数据发送到界面上
	void threadSendMessageToUI();
private:
	std::size_t m_iPort;
	std::string m_strIP;

	hio_t* m_pSockio;

	bool m_bOpenHreatBeat;

	std::function<void(std::string)> m_pDataCB;

	hloop_t* m_pHloop;
};


#include "HVTcpClient.h"
std::mutex g_mutex;
std::vector<std::string> m_DataVec;
#define CMD_HreatBeat "ClientHreatbeat"
#define CMD_SendMessage 0x01
HVTcpClient::HVTcpClient()
	: m_pSockio(nullptr)
	, m_iPort(6666)
	, m_strIP("127.0.0.1")
{
}

HVTcpClient::~HVTcpClient()
{
	this->m_pDataCB = nullptr;
	hio_read_stop(m_pSockio);

	if (m_pSockio)
	{
		delete m_pSockio;
		m_pSockio = nullptr;
	}
}

void HVTcpClient::setNetInfo(const std::size_t port, const std::string ip)
{
	m_iPort = port;
	m_strIP = ip;
	/*std::unique_lock<std::mutex> lock(g_mutex);
	m_hreatBeatVec.clear();
	lock.unlock();*/
	std::thread runSocketThread(&HVTcpClient::initHV, this);
	runSocketThread.detach();

	std::thread thread(&HVTcpClient::threadSendMessageToUI, this);
	thread.detach();
	//initHV();
}

void HVTcpClient::openHreatBeat(const bool status)
{
	if (m_pSockio == nullptr || status == false)return;
	hio_set_heartbeat(m_pSockio, 5000, HVTcpClient::hioHreatBeat);
}

void HVTcpClient::setDataCB(std::function<void(std::string)> cb)
{
	this->m_pDataCB = cb;
}

void HVTcpClient::initHV()
{
	hloop_t* pHloop = hloop_new(HLOOP_FLAG_QUIT_WHEN_NO_ACTIVE_EVENTS);
	std::cout << pHloop << std::endl;;
	auto pHIO = hread(pHloop, 0, nullptr, 0, HVTcpClient::hioHRead);
	if (pHIO == nullptr)
	{
		std::cout << "read io is nullptr" << std::endl;
		return;
	}
	m_pSockio =  hloop_create_tcp_client(pHloop, m_strIP.c_str(), m_iPort, HVTcpClient::hioConnect);
	if (m_pSockio == nullptr)
	{
		std::cout << "creat socke falid" << std::endl;
		return;
	}
	
	hloop_run(pHloop);
	hloop_free(&pHloop);
}

void HVTcpClient::hioHRead(hio_t*, void* buf, int bytes)
{

}

void HVTcpClient::hioConnect(hio_t* io)
{
	std::cout << "----Connect success" << std::endl;

	hio_setcb_read(io, HVTcpClient::hioRecv);

	hio_setcb_close(io, HVTcpClient::hioClose);

	hio_set_keepalive_timeout(io, 75000);

	hio_read(io);

}

void HVTcpClient::hioHreatBeat(hio_t* io)
{
	hio_write(io, CMD_HreatBeat, strlen(CMD_HreatBeat));
}


void HVTcpClient::hioRecv(hio_t* io, void* buf, int recvBytes)
{
	char* data = reinterpret_cast<char*>(buf);
	std::string msg(data, static_cast<std::size_t>(recvBytes));
	if (msg.size() == 0)return;
	std::cout << msg << std::endl;
	std::lock_guard<std::mutex> lock(g_mutex);
	m_DataVec.emplace_back(msg);

	if (msg.compare("ServerBackHreatBeat") == 0)
	{
		std::cout << "ServerBackHreatBeat" << std::endl;
	}
	else
	{
		std::cout << "send:" << data << std::endl;
	}
	

	fflush(stdout);
}

void HVTcpClient::hioClose(hio_t* io)
{
	std::unique_lock<std::mutex> lock(g_mutex);
	m_DataVec.clear();
	lock.unlock();
	hio_close(io);
	
	std::cout << hio_fd(io) << "client close" << std::endl;
}

void HVTcpClient::threadSendMessageToUI()
{
	while (true)
	{
		if (m_DataVec.empty())continue;
		std::this_thread::sleep_for(std::chrono::milliseconds(200));
		std::unique_lock<std::mutex> lock(g_mutex);
		if (m_pDataCB)
			m_pDataCB(m_DataVec.front());
		m_DataVec.erase(m_DataVec.begin());
		lock.unlock();
	}
}

void HVTcpClient::sendMessage(const std::string message)
{
	std::lock_guard<std::mutex> lock(g_mutex);
	if (m_pSockio == nullptr)return;
	std::string str = message;
	hio_write(m_pSockio, str.c_str(), strlen(message.c_str()));
}