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package znet
import (
"errors"
"fmt"
"io"
"net"
"zinx/ziface"
)
type Connection struct {
//当前连接的socket TCP套接字
Conn *net.TCPConn
//当前连接的ID 也可以称作为SessionID,ID全局唯一
ConnID uint32
//当前连接的关闭状态
isClosed bool
//消息管理MsgId和对应处理方法的消息管理模块
MsgHandler ziface.IMsgHandle
//告知该链接已经退出/停止的channel
ExitBuffChan chan bool
//无缓冲管道,用于读、写两个goroutine之间的消息通信
msgChan chan []byte
//给缓冲队列发送数据的channel,
// 如果向缓冲队列发送数据,那么把数据发送到这个channel下
// SendBuffChan chan []byte
}
//创建连接的方法
func NewConntion(conn *net.TCPConn, connID uint32, msgHandler ziface.IMsgHandle) *Connection{
c := &Connection{
Conn: conn,
ConnID: connID,
isClosed: false,
MsgHandler: msgHandler,
ExitBuffChan: make(chan bool, 1),
msgChan:make(chan []byte),
// SendBuffChan: make(chan []byte, 512),
}
return c
}
/*
写消息Goroutine, 用户将数据发送给客户端
*/
func (c *Connection) StartWriter() {
defer fmt.Println(c.RemoteAddr().String(), " conn Writer exit!")
defer c.Stop()
for {
select {
case data := <-c.msgChan:
//有数据要写给客户端
if _, err := c.Conn.Write(data); err != nil {
fmt.Println("Send Data error:, ", err, " Conn Writer exit")
return
}
case <- c.ExitBuffChan:
//conn已经关闭
return
}
}
}
/*
读消息Goroutine,用于从客户端中读取数据
*/
func (c *Connection) StartReader() {
fmt.Println("Reader Goroutine is running")
defer fmt.Println(c.RemoteAddr().String(), " conn reader exit!")
defer c.Stop()
for {
// 创建拆包解包的对象
dp := NewDataPack()
//读取客户端的Msg head
headData := make([]byte, dp.GetHeadLen())
if _, err := io.ReadFull(c.GetTCPConnection(), headData); err != nil {
fmt.Println("read msg head error ", err)
c.ExitBuffChan <- true
continue
}
//拆包,得到msgid 和 datalen 放在msg中
msg , err := dp.Unpack(headData)
if err != nil {
fmt.Println("unpack error ", err)
c.ExitBuffChan <- true
continue
}
//根据 dataLen 读取 data,放在msg.Data中
var data []byte
if msg.GetDataLen() > 0 {
data = make([]byte, msg.GetDataLen())
if _, err := io.ReadFull(c.GetTCPConnection(), data); err != nil {
fmt.Println("read msg data error ", err)
c.ExitBuffChan <- true
continue
}
}
msg.SetData(data)
//得到当前客户端请求的Request数据
req := Request{
conn:c,
msg:msg,
}
//从绑定好的消息和对应的处理方法中执行对应的Handle方法
go c.MsgHandler.DoMsgHandler(&req)
}
}
//启动连接,让当前连接开始工作
func (c *Connection) Start() {
//1 开启用户从客户端读取数据流程的Goroutine
go c.StartReader()
//2 开启用于写回客户端数据流程的Goroutine
go c.StartWriter()
for {
select {
case <- c.ExitBuffChan:
//得到退出消息,不再阻塞
return
}
}
}
//停止连接,结束当前连接状态M
func (c *Connection) Stop() {
//1. 如果当前链接已经关闭
if c.isClosed == true {
return
}
c.isClosed = true
//TODO Connection Stop() 如果用户注册了该链接的关闭回调业务,那么在此刻应该显示调用
// 关闭socket链接
c.Conn.Close()
//通知从缓冲队列读数据的业务,该链接已经关闭
c.ExitBuffChan <- true
//关闭该链接全部管道
close(c.ExitBuffChan)
//close(c.SendBuffChan)
}
//从当前连接获取原始的socket TCPConn
func (c *Connection) GetTCPConnection() *net.TCPConn {
return c.Conn
}
//获取当前连接ID
func (c *Connection) GetConnID() uint32{
return c.ConnID
}
//获取远程客户端地址信息
func (c *Connection) RemoteAddr() net.Addr {
return c.Conn.RemoteAddr()
}
//直接将Message数据发送数据给远程的TCP客户端
func (c *Connection) SendMsg(msgId uint32, data []byte) error {
if c.isClosed == true {
return errors.New("Connection closed when send msg")
}
//将data封包,并且发送
dp := NewDataPack()
msg, err := dp.Pack(NewMsgPackage(msgId, data))
if err != nil {
fmt.Println("Pack error msg id = ", msgId)
return errors.New("Pack error msg ")
}
//写回客户端
c.msgChan <- msg
return nil
}
//将数据发送给缓冲队列,通过专门从缓冲队列读数据的go写给客户端
//func (c *Connection) SendBuff(data []byte) error {
// return nil
//}