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wsconn.go
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wsconn.go
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package ws
import (
"bufio"
"io"
"net"
"sync"
"time"
"github.com/gorilla/websocket"
"v2ray.com/core/common/log"
)
type wsconn struct {
wsc *websocket.Conn
readBuffer *bufio.Reader
connClosing bool
reusable bool
rlock *sync.Mutex
wlock *sync.Mutex
config *Config
}
func (ws *wsconn) Read(b []byte) (n int, err error) {
ws.rlock.Lock()
n, err = ws.read(b)
ws.rlock.Unlock()
return n, err
}
func (ws *wsconn) read(b []byte) (n int, err error) {
if ws.connClosing {
return 0, io.EOF
}
n, err = ws.readNext(b)
return n, err
}
func (ws *wsconn) getNewReadBuffer() error {
_, r, err := ws.wsc.NextReader()
if err != nil {
log.Warning("WS transport: ws connection NewFrameReader return " + err.Error())
ws.connClosing = true
ws.Close()
return err
}
ws.readBuffer = bufio.NewReader(r)
return nil
}
func (ws *wsconn) readNext(b []byte) (n int, err error) {
if ws.readBuffer == nil {
err = ws.getNewReadBuffer()
if err != nil {
return 0, err
}
}
n, err = ws.readBuffer.Read(b)
if err == nil {
return n, err
}
if err == io.EOF {
ws.readBuffer = nil
if n == 0 {
return ws.readNext(b)
}
return n, nil
}
return n, err
}
func (ws *wsconn) Write(b []byte) (n int, err error) {
ws.wlock.Lock()
if ws.connClosing {
return 0, io.EOF
}
n, err = ws.write(b)
ws.wlock.Unlock()
return n, err
}
func (ws *wsconn) write(b []byte) (n int, err error) {
wr, err := ws.wsc.NextWriter(websocket.BinaryMessage)
if err != nil {
log.Warning("WS transport: ws connection NewFrameReader return " + err.Error())
ws.connClosing = true
ws.Close()
return 0, err
}
n, err = wr.Write(b)
if err != nil {
return 0, err
}
err = wr.Close()
if err != nil {
return 0, err
}
return n, err
}
func (ws *wsconn) Close() error {
ws.connClosing = true
ws.wlock.Lock()
ws.wsc.WriteControl(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""), time.Now().Add((time.Second * 5)))
ws.wlock.Unlock()
err := ws.wsc.Close()
return err
}
func (ws *wsconn) LocalAddr() net.Addr {
return ws.wsc.LocalAddr()
}
func (ws *wsconn) RemoteAddr() net.Addr {
return ws.wsc.RemoteAddr()
}
func (ws *wsconn) SetDeadline(t time.Time) error {
return func() error {
errr := ws.SetReadDeadline(t)
errw := ws.SetWriteDeadline(t)
if errr == nil || errw == nil {
return nil
}
if errr != nil {
return errr
}
return errw
}()
}
func (ws *wsconn) SetReadDeadline(t time.Time) error {
return ws.wsc.SetReadDeadline(t)
}
func (ws *wsconn) SetWriteDeadline(t time.Time) error {
return ws.wsc.SetWriteDeadline(t)
}
func (ws *wsconn) setup() {
ws.connClosing = false
/*
https://godoc.org/github.com/gorilla/websocket#Conn.NextReader
https://godoc.org/github.com/gorilla/websocket#Conn.NextWriter
Both Read and write access are both exclusive.
And in both case it will need a lock.
*/
ws.rlock = &sync.Mutex{}
ws.wlock = &sync.Mutex{}
ws.pingPong()
}
func (ws *wsconn) Reusable() bool {
return ws.reusable && !ws.connClosing
}
func (ws *wsconn) SetReusable(reusable bool) {
if !ws.config.ConnectionReuse.IsEnabled() {
return
}
ws.reusable = reusable
}
func (ws *wsconn) pingPong() {
pongRcv := make(chan int, 0)
ws.wsc.SetPongHandler(func(data string) error {
pongRcv <- 0
return nil
})
go func() {
for !ws.connClosing {
ws.wlock.Lock()
ws.wsc.WriteMessage(websocket.PingMessage, nil)
ws.wlock.Unlock()
tick := time.After(time.Second * 3)
select {
case <-pongRcv:
break
case <-tick:
if !ws.connClosing {
log.Debug("WS:Closing as ping is not responded~" + ws.wsc.UnderlyingConn().LocalAddr().String() + "-" + ws.wsc.UnderlyingConn().RemoteAddr().String())
}
ws.Close()
}
<-time.After(time.Second * 27)
}
return
}()
}