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websocket.go
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/
websocket.go
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package weblogger
import (
"net"
"net/http"
"time"
"github.com/gorilla/websocket"
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
type Socket struct {
R <-chan []byte
RE <-chan error
W chan<- []byte
WE chan<- error
Addr net.Addr
}
func done(conn *websocket.Conn, cc int, msg string) {
conn.WriteControl(websocket.CloseMessage, websocket.FormatCloseMessage(cc, msg), time.Time{})
}
func read(conn *websocket.Conn, rc chan []byte, rec chan error) {
defer conn.Close()
for {
t, p, err := conn.ReadMessage()
if err != nil {
rec <- err
return
}
if t == websocket.TextMessage {
rc <- p
}
}
}
func write(conn *websocket.Conn, wc chan []byte, rec chan error, wec chan error) {
defer conn.Close()
for {
select {
case p, ok := <-wc:
if !ok {
done(conn, websocket.CloseNormalClosure, "OK")
return
}
err := conn.WriteMessage(websocket.TextMessage, []byte(p))
if err != nil {
done(conn, websocket.CloseInternalServerErr, err.Error())
rec <- err
return
}
case err := <-wec:
done(conn, websocket.CloseInternalServerErr, err.Error())
return
}
}
}
func WebSocket(r *http.Request, w http.ResponseWriter) (*Socket, error) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
return nil, err
}
// Make channels.
rc := make(chan []byte)
rec := make(chan error)
wc := make(chan []byte)
wec := make(chan error)
cs := &Socket{rc, rec, wc, wec, conn.RemoteAddr()}
// Start read and write routines.
go read(conn, rc, rec)
go write(conn, wc, rec, wec)
return cs, nil
}