基于libuv的TCP设计

      本人一直在寻找一个跨平台的网络库，boost与ACE比较庞大，不考虑。对比了libevent,libev,libuv后，最终选择了libuv.可libuv文档少，例子也简单，对于tcp只有个echo-server的例子。网上也找过对其封装的例子，如下

libsourcey库，封装了许多库。对libuv的封装跟其他代码耦合比较紧，难为剥离 http://sourcey.com/libuv-cpp-wrappers/
C++11封装的，可惜VS10未完全支持C++11 https://github.com/larroy/uvpp
C++封装的  https://github.com/keepallsimple/uvpp

       本人想实现一个raw tcp server,支持上万链接数的，网上找到的都没合适我的，没办法只能参照各例子自己封装了。

/***************************************
* @file     tcpsocket.h
* @brief    基于libuv封装的tcp服务器与客户端,使用log4z作日志工具
* @details
* @author   phata, [email protected]
* @date     2014-5-13
* @mod      2014-5-13  phata  修正服务器与客户端的错误.现服务器支持多客户端连接
                              修改客户端测试代码，支持并发多客户端测试
****************************************/
#ifndef TCPSocket_H
#define TCPSocket_H
#include "uv.h"
#include <string>
#include <list>
#include <map>
#define BUFFERSIZE (1024*1024)

namespace uv
{
typedef void (*newconnect)(int clientid);
typedef void (*server_recvcb)(int cliendid, const char* buf, int bufsize);
typedef void (*client_recvcb)(const char* buf, int bufsize, void* userdata);

class TCPServer;
class clientdata
{
public:
    clientdata(int clientid):client_id(clientid),recvcb_(nullptr) {
        client_handle = (uv_tcp_t*)malloc(sizeof(*client_handle));
        client_handle->data = this;
        readbuffer = uv_buf_init((char*)malloc(BUFFERSIZE), BUFFERSIZE);
		writebuffer = uv_buf_init((char*)malloc(BUFFERSIZE), BUFFERSIZE);
    }
    virtual ~clientdata() {
        free(readbuffer.base);
        readbuffer.base = nullptr;
        readbuffer.len = 0;

		free(writebuffer.base);
		writebuffer.base = nullptr;
		writebuffer.len = 0;

        free(client_handle);
        client_handle = nullptr;
    }
    int client_id;//客户端id,惟一
    uv_tcp_t* client_handle;//客户端句柄
    TCPServer* tcp_server;//服务器句柄(保存是因为某些回调函数需要到)
    uv_buf_t readbuffer;//接受数据的buf
	uv_buf_t writebuffer;//写数据的buf
    uv_write_t write_req;
    server_recvcb recvcb_;//接收数据回调给用户的函数
};


class TCPServer
{
public:
    TCPServer(uv_loop_t* loop = uv_default_loop());
    virtual ~TCPServer();
    static void StartLog(const char* logpath = nullptr);//启动日志，必须启动才会生成日志
public:
    //基本函数
    bool Start(const char *ip, int port);//启动服务器,地址为IP4
    bool Start6(const char *ip, int port);//启动服务器，地址为IP6
    void close();

    bool setNoDelay(bool enable);
    bool setKeepAlive(int enable, unsigned int delay);

    const char* GetLastErrMsg() const {
        return errmsg_.c_str();
    };

    virtual int  send(int clientid, const char* data, std::size_t len);
    virtual void setnewconnectcb(newconnect cb);
    virtual void setrecvcb(int clientid,server_recvcb cb);//设置接收回调函数，每个客户端各有一个
protected:
    int GetAvailaClientID()const;//获取可用的client id
    bool DeleteClient(int clientid);//删除链表中的客户端
    //静态回调函数
    static void AfterServerRecv(uv_stream_t *client, ssize_t nread, const uv_buf_t* buf);
    static void AfterSend(uv_write_t *req, int status);
    static void onAllocBuffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf);
    static void AfterServerClose(uv_handle_t *handle);
	static void AfterClientClose(uv_handle_t *handle);
    static void acceptConnection(uv_stream_t *server, int status);

private:
    bool init();
    bool run(int status = UV_RUN_DEFAULT);
    bool bind(const char* ip, int port);
    bool bind6(const char* ip, int port);
    bool listen(int backlog = 1024);


    uv_tcp_t server_;//服务器链接
    std::map<int,clientdata*> clients_list_;//子客户端链接
	uv_mutex_t mutex_handle_;//保护clients_list_
    uv_loop_t *loop_;
    std::string errmsg_;
    newconnect newconcb_;
	bool isinit_;//是否已初始化，用于close函数中判断
};



class TCPClient
{
    //直接调用connect/connect6会进行连接
public:
    TCPClient(uv_loop_t* loop = uv_default_loop());
    virtual ~TCPClient();
    static void StartLog(const char* logpath = nullptr);//启动日志，必须启动才会生成日志
public:
    //基本函数
    virtual bool connect(const char* ip, int port);//启动connect线程，循环等待直到connect完成
    virtual bool connect6(const char* ip, int port);//启动connect线程，循环等待直到connect完成
    virtual int  send(const char* data, std::size_t len);
    virtual void setrecvcb(client_recvcb cb, void* userdata);////设置接收回调函数，只有一个
    void close();

    //是否启用Nagle算法
    bool setNoDelay(bool enable);
    bool setKeepAlive(int enable, unsigned int delay);

    const char* GetLastErrMsg() const {
        return errmsg_.c_str();
    };
protected:
    //静态回调函数
    static void AfterConnect(uv_connect_t* handle, int status);
    static void AfterClientRecv(uv_stream_t *client, ssize_t nread, const uv_buf_t* buf);
    static void AfterSend(uv_write_t *req, int status);
    static void onAllocBuffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf);
    static void AfterClose(uv_handle_t *handle);

    static void ConnectThread(void* arg);//真正的connect线程
    static void ConnectThread6(void* arg);//真正的connect线程

    bool init();
    bool run(int status = UV_RUN_DEFAULT);
private:
    enum {
        CONNECT_TIMEOUT,
        CONNECT_FINISH,
        CONNECT_ERROR,
        CONNECT_DIS,
    };
    uv_tcp_t client_;//客户端连接
    uv_loop_t *loop_;
    uv_write_t write_req_;//写时请求
    uv_connect_t connect_req_;//连接时请求
    uv_thread_t connect_threadhanlde_;//线程句柄
    std::string errmsg_;//错误信息
    uv_buf_t readbuffer_;//接受数据的buf
	uv_buf_t writebuffer_;//写数据的buf
	uv_mutex_t write_mutex_handle_;//保护write,保存前一write完成才进行下一write

    int connectstatus_;//连接状态
    client_recvcb recvcb_;//回调函数
    void* userdata_;//回调函数的用户数据
    std::string connectip_;//连接的服务器IP
    int connectport_;//连接的服务器端口号
	bool isinit_;//是否已初始化，用于close函数中判断
};

}


#endif // TCPSocket_H

#include "tcpsocket.h"
#include "log4z.h"

std::string GetUVError(int retcode)
{
    std::string err;
    err = uv_err_name(retcode);
    err +=":";
    err += uv_strerror(retcode);
    return std::move(err);
}

namespace uv
{
/*****************************************TCP Server*************************************************************/
TCPServer::TCPServer(uv_loop_t* loop)
    :newconcb_(nullptr), isinit_(false)
{
    loop_ = loop;
}


TCPServer::~TCPServer()
{
    close();
    LOGI("tcp server exit.");
}

//初始化与关闭--服务器与客户端一致
bool TCPServer::init()
{
    if (isinit_) {
        return true;
    }

    if (!loop_) {
        errmsg_ = "loop is null on tcp init.";
        LOGE(errmsg_);
        return false;
    }
    int iret = uv_mutex_init(&mutex_handle_);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    iret = uv_tcp_init(loop_,&server_);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    isinit_ = true;
    server_.data = this;
    //iret = uv_tcp_keepalive(&server_, 1, 60);//调用此函数后后续函数会调用出错
    //if (iret) {
    //	errmsg_ = GetUVError(iret);
    //	return false;
    //}
    return true;
}

void TCPServer::close()
{
    for (auto it = clients_list_.begin(); it!=clients_list_.end(); ++it) {
        auto data = it->second;
        uv_close((uv_handle_t*)data->client_handle,AfterClientClose);
    }
    clients_list_.clear();

    LOGI("close server");
    if (isinit_) {
        uv_close((uv_handle_t*) &server_, AfterServerClose);
        LOGI("close server");
    }
    isinit_ = false;
    uv_mutex_destroy(&mutex_handle_);
}

bool TCPServer::run(int status)
{
    LOGI("server runing.");
    int iret = uv_run(loop_,(uv_run_mode)status);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    return true;
}
//属性设置--服务器与客户端一致
bool TCPServer::setNoDelay(bool enable)
{
    int iret = uv_tcp_nodelay(&server_, enable ? 1 : 0);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    return true;
}

bool TCPServer::setKeepAlive(int enable, unsigned int delay)
{
    int iret = uv_tcp_keepalive(&server_, enable , delay);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    return true;
}

//作为server时的函数
bool TCPServer::bind(const char* ip, int port)
{
    struct sockaddr_in bind_addr;
    int iret = uv_ip4_addr(ip, port, &bind_addr);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    iret = uv_tcp_bind(&server_, (const struct sockaddr*)&bind_addr,0);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    LOGI("server bind ip="<<ip<<", port="<<port);
    return true;
}

bool TCPServer::bind6(const char* ip, int port)
{
    struct sockaddr_in6 bind_addr;
    int iret = uv_ip6_addr(ip, port, &bind_addr);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    iret = uv_tcp_bind(&server_, (const struct sockaddr*)&bind_addr,0);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    LOGI("server bind ip="<<ip<<", port="<<port);
    return true;
}

bool TCPServer::listen(int backlog)
{
    int iret = uv_listen((uv_stream_t*) &server_, backlog, acceptConnection);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    LOGI("server listen");
    return true;
}

bool TCPServer::Start( const char *ip, int port )
{
    close();
    if (!init()) {
        return false;
    }
    if (!bind(ip,port)) {
        return false;
    }
    if (!listen(SOMAXCONN)) {
        return false;
    }
    if (!run()) {
        return false;
    }
    LOGI("start listen "<<ip<<": "<<port);
    return true;
}

bool TCPServer::Start6( const char *ip, int port )
{
    close();
    if (!init()) {
        return false;
    }
    if (!bind6(ip,port)) {
        return false;
    }
    if (!listen(SOMAXCONN)) {
        return false;
    }
    if (!run()) {
        return false;
    }
    return true;
}

//服务器发送函数
int TCPServer::send(int clientid, const char* data, std::size_t len)
{
    auto itfind = clients_list_.find(clientid);
    if (itfind == clients_list_.end()) {
        errmsg_ = "can't find cliendid ";
        errmsg_ += std::to_string((long long)clientid);
        LOGE(errmsg_);
        return -1;
    }
    //自己控制data的生命周期直到write结束
    if (itfind->second->writebuffer.len < len) {
        itfind->second->writebuffer.base = (char*)realloc(itfind->second->writebuffer.base,len);
        itfind->second->writebuffer.len = len;
    }
    memcpy(itfind->second->writebuffer.base,data,len);
    uv_buf_t buf = uv_buf_init((char*)itfind->second->writebuffer.base,len);
    int iret = uv_write(&itfind->second->write_req, (uv_stream_t*)itfind->second->client_handle, &buf, 1, AfterSend);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    return true;
}

//服务器-新客户端函数
void TCPServer::acceptConnection(uv_stream_t *server, int status)
{
    if (!server->data) {
        return;
    }
    TCPServer *tcpsock = (TCPServer *)server->data;
    int clientid = tcpsock->GetAvailaClientID();
    clientdata* cdata = new clientdata(clientid);//uv_close回调函数中释放
    cdata->tcp_server = tcpsock;//保存服务器的信息
    int iret = uv_tcp_init(tcpsock->loop_, cdata->client_handle);//析构函数释放
    if (iret) {
        delete cdata;
        tcpsock->errmsg_ = GetUVError(iret);
        LOGE(tcpsock->errmsg_);
        return;
    }
    iret = uv_accept((uv_stream_t*)&tcpsock->server_, (uv_stream_t*) cdata->client_handle);
    if ( iret) {
        tcpsock->errmsg_ = GetUVError(iret);
        uv_close((uv_handle_t*) cdata->client_handle, NULL);
        delete cdata;
        LOGE(tcpsock->errmsg_);
        return;
    }
    tcpsock->clients_list_.insert(std::make_pair(clientid,cdata));//加入到链接队列
    if (tcpsock->newconcb_) {
        tcpsock->newconcb_(clientid);
    }
    LOGI("new client("<<cdata->client_handle<<") id="<< clientid);
    iret = uv_read_start((uv_stream_t*)cdata->client_handle, onAllocBuffer, AfterServerRecv);//服务器开始接收客户端的数据
    return;
}

//服务器-接收数据回调函数
void TCPServer::setrecvcb(int clientid, server_recvcb cb )
{
    auto itfind = clients_list_.find(clientid);
    if (itfind != clients_list_.end()) {
        itfind->second->recvcb_ = cb;
    }
}

//服务器-新链接回调函数
void TCPServer::setnewconnectcb(newconnect cb )
{
    newconcb_ = cb;
}

//服务器分析空间函数
void TCPServer::onAllocBuffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf)
{
    if (!handle->data) {
        return;
    }
    clientdata *client = (clientdata*)handle->data;
    *buf = client->readbuffer;
}

void TCPServer::AfterServerRecv(uv_stream_t *handle, ssize_t nread, const uv_buf_t* buf)
{
    if (!handle->data) {
        return;
    }
    clientdata *client = (clientdata*)handle->data;//服务器的recv带的是clientdata
    if (nread < 0) {/* Error or EOF */
        TCPServer *server = (TCPServer *)client->tcp_server;
        if (nread == UV_EOF) {
            fprintf(stdout,"客户端(%d)连接断开，关闭此客户端\n",client->client_id);
            LOGW("客户端("<<client->client_id<<")主动断开");
        } else if (nread == UV_ECONNRESET) {
            fprintf(stdout,"客户端(%d)异常断开\n",client->client_id);
            LOGW("客户端("<<client->client_id<<")异常断开");
        } else {
            fprintf(stdout,"%s\n",GetUVError(nread));
            LOGW("客户端("<<client->client_id<<")异常断开："<<GetUVError(nread));
        }
        server->DeleteClient(client->client_id);//连接断开，关闭客户端
        return;
    } else if (0 == nread)  {/* Everything OK, but nothing read. */

    } else if (client->recvcb_) {
        client->recvcb_(client->client_id,buf->base,nread);
    }
}

//服务器与客户端一致
void TCPServer::AfterSend(uv_write_t *req, int status)
{
    if (status < 0) {
        LOGE("发送数据有误:"<<GetUVError(status));
        fprintf(stderr, "Write error %s\n", GetUVError(status));
    }
}

void TCPServer::AfterServerClose(uv_handle_t *handle)
{
    //服务器,不需要做什么
}

void TCPServer::AfterClientClose(uv_handle_t *handle)
{
    clientdata *cdata = (clientdata*)handle->data;
    LOGI("client "<<cdata->client_id<<" had closed.");
    delete cdata;
}

int TCPServer::GetAvailaClientID() const
{
    static int s_id = 0;
    return ++s_id;
}

bool TCPServer::DeleteClient( int clientid )
{
    uv_mutex_lock(&mutex_handle_);
    auto itfind = clients_list_.find(clientid);
    if (itfind == clients_list_.end()) {
        errmsg_ = "can't find client ";
        errmsg_ += std::to_string((long long)clientid);
        LOGE(errmsg_);
        uv_mutex_unlock(&mutex_handle_);
        return false;
    }
    if (uv_is_active((uv_handle_t*)itfind->second->client_handle)) {
        uv_read_stop((uv_stream_t*)itfind->second->client_handle);
    }
    uv_close((uv_handle_t*)itfind->second->client_handle,AfterClientClose);

    clients_list_.erase(itfind);
    LOGI("删除客户端"<<clientid);
    uv_mutex_unlock(&mutex_handle_);
    return true;
}


void TCPServer::StartLog( const char* logpath /*= nullptr*/ )
{
    zsummer::log4z::ILog4zManager::GetInstance()->SetLoggerMonthdir(LOG4Z_MAIN_LOGGER_ID, true);
    zsummer::log4z::ILog4zManager::GetInstance()->SetLoggerDisplay(LOG4Z_MAIN_LOGGER_ID,false);
    zsummer::log4z::ILog4zManager::GetInstance()->SetLoggerLevel(LOG4Z_MAIN_LOGGER_ID,LOG_LEVEL_DEBUG);
    zsummer::log4z::ILog4zManager::GetInstance()->SetLoggerLimitSize(LOG4Z_MAIN_LOGGER_ID,100);
    if (logpath) {
        zsummer::log4z::ILog4zManager::GetInstance()->SetLoggerPath(LOG4Z_MAIN_LOGGER_ID,logpath);
    }
    zsummer::log4z::ILog4zManager::GetInstance()->Start();
}


/*****************************************TCP Client*************************************************************/
TCPClient::TCPClient(uv_loop_t* loop)
    :recvcb_(nullptr),userdata_(nullptr)
    ,connectstatus_(CONNECT_DIS)
    , isinit_(false)
{
    readbuffer_ = uv_buf_init((char*) malloc(BUFFERSIZE), BUFFERSIZE);
    writebuffer_ = uv_buf_init((char*) malloc(BUFFERSIZE), BUFFERSIZE);
    loop_ = loop;
    connect_req_.data = this;
    write_req_.data = this;
}


TCPClient::~TCPClient()
{
    free(readbuffer_.base);
    readbuffer_.base = nullptr;
    readbuffer_.len = 0;
    free(writebuffer_.base);
    writebuffer_.base = nullptr;
    writebuffer_.len = 0;
    close();
    LOGI("客户端("<<this<<")退出");
}
//初始化与关闭--服务器与客户端一致
bool TCPClient::init()
{
    if (isinit_) {
        return true;
    }

    if (!loop_) {
        errmsg_ = "loop is null on tcp init.";
        LOGE(errmsg_);
        return false;
    }
    int iret = uv_tcp_init(loop_,&client_);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
	iret = uv_mutex_init(&write_mutex_handle_);
	if (iret) {
		errmsg_ = GetUVError(iret);
		LOGE(errmsg_);
		return false;
	}
	isinit_ = true;
    fprintf(stdout,"客户端(%p) init type = %d\n",&client_,client_.type);
    client_.data = this;
    //iret = uv_tcp_keepalive(&client_, 1, 60);//
    //if (iret) {
    //    errmsg_ = GetUVError(iret);
    //    return false;
    //}
    LOGI("客户端("<<this<<")Init");
    return true;
}

void TCPClient::close()
{
    if (!isinit_) {
        return;
    }
	uv_mutex_destroy(&write_mutex_handle_);
    uv_close((uv_handle_t*) &client_, AfterClose);
    LOGI("客户端("<<this<<")close");
    isinit_ = false;
}

bool TCPClient::run(int status)
{
    LOGI("客户端("<<this<<")run");
    int iret = uv_run(loop_,(uv_run_mode)status);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    return true;
}

//属性设置--服务器与客户端一致
bool TCPClient::setNoDelay(bool enable)
{
    //http://blog.csdn.net/u011133100/article/details/21485983
    int iret = uv_tcp_nodelay(&client_, enable ? 1 : 0);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    return true;
}

bool TCPClient::setKeepAlive(int enable, unsigned int delay)
{
    int iret = uv_tcp_keepalive(&client_, enable , delay);
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    return true;
}

//作为client的connect函数
bool TCPClient::connect(const char* ip, int port)
{
    close();
    init();
    connectip_ = ip;
    connectport_ = port;
    LOGI("客户端("<<this<<")start connect to server("<<ip<<":"<<port<<")");
    int iret = uv_thread_create(&connect_threadhanlde_, ConnectThread, this);//触发AfterConnect才算真正连接成功，所以用线程
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    while ( connectstatus_ == CONNECT_DIS) {
#if defined (WIN32) || defined(_WIN32)
        Sleep(100);
#else
        usleep((100) * 1000)
#endif
    }
    return connectstatus_ == CONNECT_FINISH;
}

bool TCPClient::connect6(const char* ip, int port)
{
    close();
    init();
    connectip_ = ip;
    connectport_ = port;
    LOGI("客户端("<<this<<")start connect to server("<<ip<<":"<<port<<")");
    int iret = uv_thread_create(&connect_threadhanlde_, ConnectThread6, this);//触发AfterConnect才算真正连接成功，所以用线程
    if (iret) {
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    while ( connectstatus_ == CONNECT_DIS) {
        //fprintf(stdout,"client(%p) wait, connect status %d\n",this,connectstatus_);
#if defined (WIN32) || defined(_WIN32)
        Sleep(100);
#else
        usleep((100) * 1000)
#endif
    }
    return connectstatus_ == CONNECT_FINISH;
}

void TCPClient::ConnectThread( void* arg )
{
    TCPClient *pclient = (TCPClient*)arg;
    fprintf(stdout,"client(%p) ConnectThread start\n",pclient);
    struct sockaddr_in bind_addr;
    int iret = uv_ip4_addr(pclient->connectip_.c_str(), pclient->connectport_, &bind_addr);
    if (iret) {
        pclient->errmsg_ = GetUVError(iret);
        LOGE(pclient->errmsg_);
        return;
    }
    iret = uv_tcp_connect(&pclient->connect_req_, &pclient->client_, (const sockaddr*)&bind_addr, AfterConnect);
    if (iret) {
        pclient->errmsg_ = GetUVError(iret);
        LOGE(pclient->errmsg_);
        return;
    }
    fprintf(stdout,"client(%p) ConnectThread end, connect status %d\n",pclient, pclient->connectstatus_);
    pclient->run();
}


void TCPClient::ConnectThread6( void* arg )
{
    TCPClient *pclient = (TCPClient*)arg;
    LOGI("客户端("<<pclient<<")Enter Connect Thread.");
    fprintf(stdout,"client(%p) ConnectThread start\n",pclient);
    struct sockaddr_in6 bind_addr;
    int iret = uv_ip6_addr(pclient->connectip_.c_str(), pclient->connectport_, &bind_addr);
    if (iret) {
        pclient->errmsg_ = GetUVError(iret);
        LOGE(pclient->errmsg_);
        return;
    }
    iret = uv_tcp_connect(&pclient->connect_req_, &pclient->client_, (const sockaddr*)&bind_addr, AfterConnect);
    if (iret) {
        pclient->errmsg_ = GetUVError(iret);
        LOGE(pclient->errmsg_);
        return;
    }
    fprintf(stdout,"client(%p) ConnectThread end, connect status %d\n",pclient, pclient->connectstatus_);
    LOGI("客户端("<<pclient<<")Leave Connect Thread. connect status "<<pclient->connectstatus_);
    pclient->run();
}

void TCPClient::AfterConnect(uv_connect_t* handle, int status)
{
    fprintf(stdout,"start after connect\n");
    TCPClient *pclient = (TCPClient*)handle->handle->data;
    if (status) {
        pclient->connectstatus_ = CONNECT_ERROR;
        fprintf(stdout,"connect error:%s\n",GetUVError(status));
        return;
    }

    int iret = uv_read_start(handle->handle, onAllocBuffer, AfterClientRecv);//客户端开始接收服务器的数据
    if (iret) {
        fprintf(stdout,"uv_read_start error:%s\n",GetUVError(iret));
        pclient->connectstatus_ = CONNECT_ERROR;
    } else {
        pclient->connectstatus_ = CONNECT_FINISH;
    }
    LOGI("客户端("<<pclient<<")run");
    fprintf(stdout,"end after connect\n");
}

//客户端的发送函数
int TCPClient::send(const char* data, std::size_t len)
{
    //自己控制data的生命周期直到write结束
    if (!data || len <= 0) {
        errmsg_ = "send data is null or len less than zero.";
        return 0;
    }

	uv_mutex_lock(&write_mutex_handle_);
    if (writebuffer_.len < len) {
        writebuffer_.base = (char*)realloc(writebuffer_.base,len);
        writebuffer_.len = len;
    }
    memcpy(writebuffer_.base,data,len);
    uv_buf_t buf = uv_buf_init((char*)writebuffer_.base,len);
    int iret = uv_write(&write_req_, (uv_stream_t*)&client_, &buf, 1, AfterSend);
    if (iret) {
		uv_mutex_unlock(&write_mutex_handle_);
        errmsg_ = GetUVError(iret);
        LOGE(errmsg_);
        return false;
    }
    return true;
}

//客户端-接收数据回调函数
void TCPClient::setrecvcb(client_recvcb cb, void* userdata )
{
    recvcb_ = cb;
    userdata_ = userdata;
}

//客户端分析空间函数
void TCPClient::onAllocBuffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf)
{
    if (!handle->data) {
        return;
    }
    TCPClient *client = (TCPClient*)handle->data;
    *buf = client->readbuffer_;
}


void TCPClient::AfterClientRecv(uv_stream_t *handle, ssize_t nread, const uv_buf_t* buf)
{
    if (!handle->data) {
        return;
    }
    TCPClient *client = (TCPClient*)handle->data;//服务器的recv带的是TCPClient
    if (nread < 0) {
        if (nread == UV_EOF) {
            fprintf(stdout,"服务器(%p)主动断开\n",handle);
            LOGW("服务器主动断开");
        } else if (nread == UV_ECONNRESET) {
            fprintf(stdout,"服务器(%p)异常断开\n",handle);
            LOGW("服务器异常断开");
        } else {
            fprintf(stdout,"服务器(%p)异常断开:%s\n",handle,GetUVError(nread));
            LOGW("服务器异常断开"<<GetUVError(nread));
        }
        uv_close((uv_handle_t*)handle, AfterClose);
        return;
    }
    if (nread > 0 && client->recvcb_) {
        client->recvcb_(buf->base,nread,client->userdata_);
    }
}

//服务器与客户端一致
void TCPClient::AfterSend(uv_write_t *req, int status)
{
	TCPClient *client = (TCPClient *)req->handle->data;
	uv_mutex_unlock(&client->write_mutex_handle_);
    if (status < 0) {
        LOGE("发送数据有误:"<<GetUVError(status));
        fprintf(stderr, "Write error %s\n", GetUVError(status));
    }
}
//服务器与客户端一致
void TCPClient::AfterClose(uv_handle_t *handle)
{
    fprintf(stdout,"客户端(%p)已close\n",handle);
    LOGI("客户端("<<handle<<")已close");
}

void TCPClient::StartLog( const char* logpath /*= nullptr*/ )
{
    zsummer::log4z::ILog4zManager::GetInstance()->SetLoggerMonthdir(LOG4Z_MAIN_LOGGER_ID, true);
    zsummer::log4z::ILog4zManager::GetInstance()->SetLoggerDisplay(LOG4Z_MAIN_LOGGER_ID,false);
    zsummer::log4z::ILog4zManager::GetInstance()->SetLoggerLevel(LOG4Z_MAIN_LOGGER_ID,LOG_LEVEL_DEBUG);
    zsummer::log4z::ILog4zManager::GetInstance()->SetLoggerLimitSize(LOG4Z_MAIN_LOGGER_ID,100);
    if (logpath) {
        zsummer::log4z::ILog4zManager::GetInstance()->SetLoggerPath(LOG4Z_MAIN_LOGGER_ID,logpath);
    }
    zsummer::log4z::ILog4zManager::GetInstance()->Start();
}

}

代码已上传到git:  https://github.com/wqvbjhc/libuv_tcp

按照例子，客户端可以并发20多路，超过uv_write就会assert出错，未找到原因

服务器可以接收几十路连接。万百上千路未测试过，因为没有模拟环境。