//处理连接请求
func (this *server) handlerConnection(conn *net.TCPConn) {
defer logger.CatchException()
logger.Infof("New connection coming ... IP=%s ", conn.RemoteAddr())
conn.SetNoDelay(true) //无延迟
conn.SetKeepAlive(true) //保持激活
conn.SetReadBuffer(64 * 1024) //设置读缓冲区大小
conn.SetWriteBuffer(64 * 1024) //设置写缓冲区大小
conn.SetReadDeadline(time.Now().Add(30000000 * time.Second)) //设置读超时
session := network.NewSession(conn)
defer session.Close()
for {
msg, err := session.RecvMSG()
if err != nil {
logger.Infof("RecvMsgs IP=%s err=%v", conn.RemoteAddr(), err.Error())
return
}
ret := this.ProcessMessage(session, msg)
if ret == false {
return
}
}
}
// Accept accepts connections on the listener and serves requests
// for each incoming connection. Accept blocks; the caller typically
// invokes it in a go statement.
func acceptTCP(server *Server, lis *net.TCPListener) {
var (
conn *net.TCPConn
err error
r int
)
for {
if conn, err = lis.AcceptTCP(); err != nil {
// if listener close then return
log.Error("listener.Accept(\"%s\") error(%v)", lis.Addr().String(), err)
return
}
if err = conn.SetKeepAlive(Conf.TCPKeepalive); err != nil {
log.Error("conn.SetKeepAlive() error(%v)", err)
return
}
if err = conn.SetReadBuffer(Conf.TCPSndbuf); err != nil {
log.Error("conn.SetReadBuffer() error(%v)", err)
return
}
if err = conn.SetWriteBuffer(Conf.TCPRcvbuf); err != nil {
log.Error("conn.SetWriteBuffer() error(%v)", err)
return
}
go serveTCP(server, conn, r)
if r++; r == maxInt {
r = 0
}
}
}
// NewConn creates a new connection for the sio. It generates the session id and
// prepares the internal structure for usage.
func newConn(serv *Server, fd uint32, nc *net.TCPConn) (c *Conn, err error) {
host, _, err := net.SplitHostPort(nc.RemoteAddr().String())
if err != nil {
serv.Log("mudoo/newConn: GetRemoteAddr:", err)
return
}
c = &Conn{
serv: serv,
fd: fd,
nc: nc,
raddr: host,
online: true,
lastConnected: time.Now().UnixNano(),
wakeupFlusher: make(chan byte),
wakeupReader: make(chan byte),
numConns: 0,
numHeartbeats: 0,
decBuf: new(Buffer),
}
nc.SetReadBuffer(serv.config.ReadBufferSize)
nc.SetWriteBuffer(serv.config.WriteBufferSize)
go c.keepalive()
// go c.flusher()
go c.reader()
return
}
// Accept accepts connections on the listener and serves requests
// for each incoming connection. Accept blocks; the caller typically
// invokes it in a go statement.
func (server *Server) AcceptTCP(lis *net.TCPListener, i int) {
var (
conn *net.TCPConn
err error
)
for {
log.Debug("server: accept round: %d", i)
if conn, err = lis.AcceptTCP(); err != nil {
// if listener close then return
log.Error("listener.Accept(\"%s\") error(%v)", lis.Addr().String(), err)
return
}
if err = conn.SetKeepAlive(Conf.TCPKeepalive); err != nil {
log.Error("conn.SetKeepAlive() error(%v)", err)
return
}
if err = conn.SetReadBuffer(Conf.TCPSndbuf); err != nil {
log.Error("conn.SetReadBuffer() error(%v)", err)
return
}
if err = conn.SetWriteBuffer(Conf.TCPRcvbuf); err != nil {
log.Error("conn.SetWriteBuffer() error(%v)", err)
return
}
go server.serveConn(conn, i)
if i++; i == maxInt {
i = 0
}
}
}
func (server *TcpServer) Start() (err error) {
for {
var conn *net.TCPConn
if conn, err = server.TCPListener.AcceptTCP(); err != nil {
return err
}
if server.keepAlive != nil {
if err := conn.SetKeepAlive(server.keepAlive.(bool)); err != nil {
return err
}
}
if server.keepAlivePeriod != nil {
if kap, ok := (net.Conn(conn)).(iKeepAlivePeriod); ok {
if err := kap.SetKeepAlivePeriod(server.keepAlivePeriod.(time.Duration)); err != nil {
return err
}
}
}
if server.linger != nil {
if err := conn.SetLinger(server.linger.(int)); err != nil {
return err
}
}
if server.noDelay != nil {
if err := conn.SetNoDelay(server.noDelay.(bool)); err != nil {
return err
}
}
if server.readBuffer != nil {
if err := conn.SetReadBuffer(server.readBuffer.(int)); err != nil {
return err
}
}
if server.writerBuffer != nil {
if err := conn.SetWriteBuffer(server.writerBuffer.(int)); err != nil {
return err
}
}
if server.deadline != nil {
if err := conn.SetDeadline(server.deadline.(time.Time)); err != nil {
return err
}
}
if server.readDeadline != nil {
if err := conn.SetReadDeadline(server.readDeadline.(time.Time)); err != nil {
return err
}
}
if server.writerDeadline != nil {
if err := conn.SetWriteDeadline(server.writerDeadline.(time.Time)); err != nil {
return err
}
}
if server.config != nil {
server.ServeTCP(tls.Client(conn, server.config))
} else {
server.ServeTCP(conn)
}
}
}
func configureConn (conn *net.TCPConn, spec *ConnectionSpec) {
// these two -- the most important -- are causing problems on my osx/64
// where a "service unavailable" pops up in the async reads
// but we absolutely need to be able to use timeouts.
// conn.SetReadTimeout(spec.rTimeout);
// conn.SetWriteTimeout(spec.wTimeout);
conn.SetLinger(spec.lingerspec);
conn.SetKeepAlive(spec.keepalive);
conn.SetReadBuffer(spec.rBufSize);
conn.SetWriteBuffer(spec.wBufSize);
}
func TCPConnWrite(c *net.TCPConn) error {
c.SetWriteBuffer(*packetsize)
for {
_, err := c.Write(b)
if err != nil {
if err == io.EOF {
log.Println("Client ", c.RemoteAddr(), " disconnected")
c.Close()
return nil
} else {
log.Println("Failed writing bytes to conn: ", c, " with error ", err)
c.Close()
return err
}
}
}
return nil
}
func handleConnection(conn *net.TCPConn) {
defer conn.Close()
defer func() {
if err := recover(); err != nil {
fmt.Println(err)
return
}
}()
conn.SetKeepAlive(true)
conn.SetReadBuffer(4096)
conn.SetWriteBuffer(4096)
handler := NewHandler(conn)
accu := lendecoder.NewAccumulator(handler, 2, 1200)
err := accu.ReadFrom(conn)
if err != nil {
fmt.Printf("Error: %v\n", err)
}
}
func NewSession(conn *net.TCPConn, rc *turbo.RemotingConfig) *Session {
conn.SetKeepAlive(true)
conn.SetKeepAlivePeriod(rc.IdleTime * 2)
//禁用nagle
conn.SetNoDelay(true)
conn.SetReadBuffer(rc.ReadBufferSize)
conn.SetWriteBuffer(rc.WriteBufferSize)
session := &Session{
conn: conn,
br: bufio.NewReaderSize(conn, rc.ReadBufferSize),
bw: bufio.NewWriterSize(conn, rc.WriteBufferSize),
ReadChannel: make(chan *packet.Packet, rc.ReadChannelSize),
WriteChannel: make(chan *packet.Packet, rc.WriteChannelSize),
isClose: false,
remoteAddr: conn.RemoteAddr().String(),
rc: rc}
return session
}
// ServeTCP ...
func (service *TcpService) ServeTCP(conn *net.TCPConn) (err error) {
if service.keepAlive != nil {
if err = conn.SetKeepAlive(service.keepAlive.(bool)); err != nil {
return err
}
}
if service.keepAlivePeriod != nil {
if kap, ok := (net.Conn(conn)).(iKeepAlivePeriod); ok {
if err = kap.SetKeepAlivePeriod(service.keepAlivePeriod.(time.Duration)); err != nil {
return err
}
}
}
if service.linger != nil {
if err = conn.SetLinger(service.linger.(int)); err != nil {
return err
}
}
if service.noDelay != nil {
if err = conn.SetNoDelay(service.noDelay.(bool)); err != nil {
return err
}
}
if service.readBuffer != nil {
if err = conn.SetReadBuffer(service.readBuffer.(int)); err != nil {
return err
}
}
if service.writeBuffer != nil {
if err = conn.SetWriteBuffer(service.writeBuffer.(int)); err != nil {
return err
}
}
if service.config != nil {
tlsConn := tls.Server(conn, service.config)
tlsConn.Handshake()
return service.Serve(tlsConn)
}
return service.Serve(conn)
}
// start a goroutine when a new connection is accepted
func handleClient(conn *net.TCPConn) {
defer utils.PrintPanicStack()
// set per-connection socket buffer
conn.SetReadBuffer(SO_RCVBUF)
// set initial socket buffer
conn.SetWriteBuffer(SO_SNDBUF)
// initial network control struct
header := make([]byte, 2)
in := make(chan []byte)
defer func() {
close(in) // session will close
}()
// create a new session object for the connection
var sess Session
host, port, err := net.SplitHostPort(conn.RemoteAddr().String())
if err != nil {
log.Error("cannot get remote address:", err)
return
}
sess.IP = net.ParseIP(host)
log.Infof("new connection from:%v port:%v", host, port)
// session die signal
sess.Die = make(chan struct{})
// create a write buffer
out := new_buffer(conn, sess.Die)
go out.start()
// start one agent for handling packet
wg.Add(1)
go agent(&sess, in, out)
// network loop
for {
// solve dead link problem
conn.SetReadDeadline(time.Now().Add(TCP_READ_DEADLINE * time.Second))
n, err := io.ReadFull(conn, header)
if err != nil {
log.Warningf("read header failed, ip:%v reason:%v size:%v", sess.IP, err, n)
return
}
size := binary.BigEndian.Uint16(header)
// alloc a byte slice for reading
payload := make([]byte, size)
// read msg
n, err = io.ReadFull(conn, payload)
if err != nil {
log.Warningf("read payload failed, ip:%v reason:%v size:%v", sess.IP, err, n)
return
}
select {
case in <- payload: // payload queued
case <-sess.Die:
log.Warningf("connection closed by logic, flag:%v ip:%v", sess.Flag, sess.IP)
return
}
}
}
func (service *TcpService) ServeTCP(conn *net.TCPConn) (err error) {
if service.keepAlive != nil {
if err = conn.SetKeepAlive(service.keepAlive.(bool)); err != nil {
return err
}
}
if service.keepAlivePeriod != nil {
if kap, ok := (net.Conn(conn)).(iKeepAlivePeriod); ok {
if err = kap.SetKeepAlivePeriod(service.keepAlivePeriod.(time.Duration)); err != nil {
return err
}
}
}
if service.linger != nil {
if err = conn.SetLinger(service.linger.(int)); err != nil {
return err
}
}
if service.noDelay != nil {
if err = conn.SetNoDelay(service.noDelay.(bool)); err != nil {
return err
}
}
if service.readBuffer != nil {
if err = conn.SetReadBuffer(service.readBuffer.(int)); err != nil {
return err
}
}
if service.writeBuffer != nil {
if err = conn.SetWriteBuffer(service.writeBuffer.(int)); err != nil {
return err
}
}
if service.timeout != nil {
if err = conn.SetDeadline(time.Now().Add(service.timeout.(time.Duration))); err != nil {
return err
}
}
go func(conn net.Conn) {
if service.config != nil {
tlsConn := tls.Server(conn, service.config)
tlsConn.Handshake()
conn = tlsConn
}
var data []byte
var err error
for {
if service.readTimeout != nil {
err = conn.SetReadDeadline(time.Now().Add(service.readTimeout.(time.Duration)))
}
if err == nil {
data, err = receiveDataOverTcp(conn)
}
if err == nil {
data = service.Handle(data, conn)
if service.writeTimeout != nil {
err = conn.SetWriteDeadline(time.Now().Add(service.writeTimeout.(time.Duration)))
}
if err == nil {
err = sendDataOverTcp(conn, data)
}
}
if err != nil {
conn.Close()
break
}
}
}(conn)
return nil
}
// start a goroutine when a new connection is accepted
func handleClient(conn *net.TCPConn) {
defer utils.PrintPanicStack()
// set per-connection socket buffer
//设置conn连接接受缓存的大小, 当超过缓存时, 会进入阻塞状态,等待被读取
conn.SetReadBuffer(SO_RCVBUF)
// set initial socket buffer
//设置conn连接发送缓存的大小, 当超过缓存时, 会进入阻塞状态,等待被发送成功
conn.SetWriteBuffer(SO_SNDBUF)
// initial network control struct
// 初始化2个字节数组, 用于存储header长度, 既后面要读取的文件长度
header := make([]byte, 2)
// 输入流通道, 解析后的数据将放入，等待被处理
in := make(chan []byte)
//设置延迟函数，当玩家断开连接时, 函数退出之前，关闭输入流
defer func() {
close(in) // session will close
}()
// create a new session object for the connection
//创建session对象, 用于封装客户端和服务器的信息交换
var sess Session
host, port, err := net.SplitHostPort(conn.RemoteAddr().String())
if err != nil {
log.Error("cannot get remote address:", err)
return
}
//存储用户ip
sess.IP = net.ParseIP(host)
//打印用户的ip和端口, 用户可能会双开？
log.Infof("new connection from:%v port:%v", host, port)
// session die signal
sess_die := make(chan bool)
//SESSION_DIE 监控有问题.................
// create a write buffer
// 创建写入buffer对象
out := new_buffer(conn, sess_die)
go out.start()
// start one agent for handling packet
//记录goroutine个数，让系统接收到关闭命令后，会阻塞主线程，至少所有agent线程退出，已保证数据落地
wg.Add(1)
go agent(&sess, in, out, sess_die)
//network loop
for {
// solve dead line problem
// 设置读超时时间, 如果在任意一次执行Read syscall 返回的时候，超过这个时间点， 则算超时
conn.SetReadDeadline(time.Now().Add(TCP_READ_DEADLINE * time.Second))
//先读取2个字节头文件长度
n, err := io.ReadFull(conn, header)
if err != nil {
log.Warningf("read header failed, ip:%v reason:%v size:%v", sess.IP, err, n)
return
}
//将2个字节数组转成int16类型, 不丢失精度
size := binary.BigEndian.Uint16(header)
// alloc a byte slice for reading
// 创建一个指定长度的切片，用于存放具体内容
payload := make([]byte, size)
//read msg
n, err = io.ReadFull(conn, payload)
if err != nil {
log.Warningf("read payload failed, ip:%v reason:%v size:%v", sess.IP, err, n)
return
}
select {
//接收的数据，转入in通道
case in <- payload: //payload queued
//监听sess_die 通道
case <-sess_die:
log.Warning("connection closed by logic, flag:%v ip:%v", sess.Flag, sess.IP)
return
}
}
// 好像没有处理连接超时, 如果玩家连上游戏后，一直未操作，再次链接时，会是新的连接？难道客户端在许久没有操作的情况下，先发一次ping, 如果有响应，继续操作，如果没响应，则执行重连？
// 如果玩家已经退出了游戏，但是通过非正常途径退出的，这时，服务器还保留着该session, 当玩家再次登陆时， 原先的连接何时删除
}
func (server *TcpServer) handle() (err error) {
defer func() {
if e := recover(); e != nil && err == nil {
err = fmt.Errorf("%v", e)
}
}()
if server.listener == nil {
return nil
}
var conn *net.TCPConn
if conn, err = server.listener.AcceptTCP(); err != nil {
return err
}
if server.keepAlive != nil {
if err = conn.SetKeepAlive(server.keepAlive.(bool)); err != nil {
return err
}
}
if server.keepAlivePeriod != nil {
if kap, ok := (net.Conn(conn)).(iKeepAlivePeriod); ok {
if err = kap.SetKeepAlivePeriod(server.keepAlivePeriod.(time.Duration)); err != nil {
return err
}
}
}
if server.linger != nil {
if err = conn.SetLinger(server.linger.(int)); err != nil {
return err
}
}
if server.noDelay != nil {
if err = conn.SetNoDelay(server.noDelay.(bool)); err != nil {
return err
}
}
if server.readBuffer != nil {
if err = conn.SetReadBuffer(server.readBuffer.(int)); err != nil {
return err
}
}
if server.writerBuffer != nil {
if err = conn.SetWriteBuffer(server.writerBuffer.(int)); err != nil {
return err
}
}
if server.deadline != nil {
if err = conn.SetDeadline(server.deadline.(time.Time)); err != nil {
return err
}
}
if server.readDeadline != nil {
if err = conn.SetReadDeadline(server.readDeadline.(time.Time)); err != nil {
return err
}
}
if server.writerDeadline != nil {
if err = conn.SetWriteDeadline(server.writerDeadline.(time.Time)); err != nil {
return err
}
}
if server.config != nil {
server.ServeTCP(tls.Client(conn, server.config))
} else {
server.ServeTCP(conn)
}
return nil
}
// PIPELINE #1: handleClient
// the goroutine is used for reading incoming PACKETS
// each packet is defined as :
// | 2B size | DATA |
//
func handleClient(conn *net.TCPConn) {
defer utils.PrintPanicStack()
// set socket read buffer
conn.SetReadBuffer(SO_RCVBUF)
// set socket write buffer
conn.SetWriteBuffer(SO_SNDBUF)
// for reading the 2-Byte header
header := make([]byte, 2)
// the input channel for agent()
in := make(chan []byte)
defer func() {
close(in) // session will close
}()
// create a new session object for the connection
// and record it's IP address
var sess Session
host, port, err := net.SplitHostPort(conn.RemoteAddr().String())
if err != nil {
log.Error("cannot get remote address:", err)
return
}
sess.IP = net.ParseIP(host)
log.Infof("new connection from:%v port:%v", host, port)
// session die signal, will be triggered by agent()
sess.Die = make(chan struct{})
// create a write buffer
out := new_buffer(conn, sess.Die)
go out.start()
// start agent for PACKET processing
wg.Add(1)
go agent(&sess, in, out)
// read loop
for {
// solve dead link problem:
// physical disconnection without any communcation between client and server
// will cause the read to block FOREVER, so a timeout is a rescue.
conn.SetReadDeadline(time.Now().Add(TCP_READ_DEADLINE * time.Second))
// read 2B header
n, err := io.ReadFull(conn, header)
if err != nil {
log.Warningf("read header failed, ip:%v reason:%v size:%v", sess.IP, err, n)
return
}
size := binary.BigEndian.Uint16(header)
// alloc a byte slice of the size defined in the header for reading data
payload := make([]byte, size)
n, err = io.ReadFull(conn, payload)
if err != nil {
log.Warningf("read payload failed, ip:%v reason:%v size:%v", sess.IP, err, n)
return
}
// deliver the data to the input queue of agent()
select {
case in <- payload: // payload queued
case <-sess.Die:
log.Warningf("connection closed by logic, flag:%v ip:%v", sess.Flag, sess.IP)
return
}
}
}