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conn.go
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conn.go
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package zero
import (
"io"
"net"
"time"
"bytes"
"errors"
"context"
"encoding/binary"
)
// Conn wrap net.Conn
type Conn struct {
sid string
rawConn net.Conn
sendCh chan []byte
done chan error
hbTimer *time.Timer
name string
messageCh chan *Message
hbInterval time.Duration
hbTimeout time.Duration
}
// GetName Get conn name
func (c *Conn) GetName() string {
return c.name
}
// NewConn create new conn
func NewConn(c net.Conn, hbInterval time.Duration, hbTimeout time.Duration) *Conn {
conn := &Conn{
rawConn: c,
sendCh: make(chan []byte, 100),
done: make(chan error),
messageCh: make(chan *Message, 100),
hbInterval: hbInterval,
hbTimeout: hbTimeout,
}
conn.name = c.RemoteAddr().String()
conn.hbTimer = time.NewTimer(conn.hbInterval)
if conn.hbInterval == 0 {
conn.hbTimer.Stop()
}
return conn
}
// Close close connection
func (c *Conn) Close() {
c.hbTimer.Stop()
c.rawConn.Close()
}
// SendMessage send message
func (c *Conn) SendMessage(msg *Message) error {
pkg, err := Encode(msg)
if err != nil {
return err
}
c.sendCh <- pkg
return nil
}
// writeCoroutine write coroutine
func (c *Conn) writeCoroutine(ctx context.Context) {
hbData := make([]byte, 0)
for {
select {
case <-ctx.Done():
return
case pkt := <-c.sendCh:
if pkt == nil {
continue
}
if _, err := c.rawConn.Write(pkt); err != nil {
c.done <- err
}
case <-c.hbTimer.C:
hbMessage := NewMessage(MsgHeartbeat, hbData)
c.SendMessage(hbMessage)
}
}
}
// readCoroutine read coroutine
func (c *Conn) readCoroutine(ctx context.Context) {
for {
select {
case <-ctx.Done():
return
default:
// 设置超时
if c.hbInterval > 0 {
err := c.rawConn.SetReadDeadline(time.Now().Add(c.hbTimeout))
if err != nil {
c.done <- err
continue
}
}
// 读取长度
buf := make([]byte, 4)
_, err := io.ReadFull(c.rawConn, buf)
if err != nil {
c.done <- err
continue
}
bufReader := bytes.NewReader(buf)
var dataSize int32
err = binary.Read(bufReader, binary.LittleEndian, &dataSize)
if err != nil {
c.done <- err
continue
}
if dataSize < 0 {
c.done <- errors.New("closed")
continue
}
// 读取数据
databuf := make([]byte, dataSize)
_, err = io.ReadFull(c.rawConn, databuf)
if err != nil {
c.done <- err
continue
}
// 解码
msg, err := Decode(databuf)
if err != nil {
c.done <- err
continue
}
// 设置心跳timer
if c.hbInterval > 0 {
c.hbTimer.Reset(c.hbInterval)
}
if msg.GetID() == MsgHeartbeat {
continue
}
c.messageCh <- msg
}
}
}