mirror of https://github.com/gorilla/websocket.git
107 lines
2.4 KiB
Go
107 lines
2.4 KiB
Go
// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package main
|
|
|
|
import (
|
|
"github.com/gorilla/websocket"
|
|
"log"
|
|
"net/http"
|
|
"time"
|
|
)
|
|
|
|
const (
|
|
// Time allowed to write a message to the peer.
|
|
writeWait = 10 * time.Second
|
|
|
|
// Time allowed to read the next pong message from the peer.
|
|
pongWait = 60 * time.Second
|
|
|
|
// Send pings to peer with this period. Must be less than pongWait.
|
|
pingPeriod = (pongWait * 9) / 10
|
|
|
|
// Maximum message size allowed from peer.
|
|
maxMessageSize = 512
|
|
)
|
|
|
|
var upgrader = websocket.Upgrader{
|
|
ReadBufferSize: 1024,
|
|
WriteBufferSize: 1024,
|
|
}
|
|
|
|
// connection is an middleman between the websocket connection and the hub.
|
|
type connection struct {
|
|
// The websocket connection.
|
|
ws *websocket.Conn
|
|
|
|
// Buffered channel of outbound messages.
|
|
send chan []byte
|
|
}
|
|
|
|
// readPump pumps messages from the websocket connection to the hub.
|
|
func (c *connection) readPump() {
|
|
defer func() {
|
|
h.unregister <- c
|
|
c.ws.Close()
|
|
}()
|
|
c.ws.SetReadLimit(maxMessageSize)
|
|
c.ws.SetReadDeadline(time.Now().Add(pongWait))
|
|
c.ws.SetPongHandler(func(string) error { c.ws.SetReadDeadline(time.Now().Add(pongWait)); return nil })
|
|
for {
|
|
_, message, err := c.ws.ReadMessage()
|
|
if err != nil {
|
|
break
|
|
}
|
|
h.broadcast <- message
|
|
}
|
|
}
|
|
|
|
// write writes a message with the given message type and payload.
|
|
func (c *connection) write(mt int, payload []byte) error {
|
|
c.ws.SetWriteDeadline(time.Now().Add(writeWait))
|
|
return c.ws.WriteMessage(mt, payload)
|
|
}
|
|
|
|
// writePump pumps messages from the hub to the websocket connection.
|
|
func (c *connection) writePump() {
|
|
ticker := time.NewTicker(pingPeriod)
|
|
defer func() {
|
|
ticker.Stop()
|
|
c.ws.Close()
|
|
}()
|
|
for {
|
|
select {
|
|
case message, ok := <-c.send:
|
|
if !ok {
|
|
c.write(websocket.CloseMessage, []byte{})
|
|
return
|
|
}
|
|
if err := c.write(websocket.TextMessage, message); err != nil {
|
|
return
|
|
}
|
|
case <-ticker.C:
|
|
if err := c.write(websocket.PingMessage, []byte{}); err != nil {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// serveWs handles websocket requests from the peer.
|
|
func serveWs(w http.ResponseWriter, r *http.Request) {
|
|
if r.Method != "GET" {
|
|
http.Error(w, "Method not allowed", 405)
|
|
return
|
|
}
|
|
ws, err := upgrader.Upgrade(w, r, nil)
|
|
if err != nil {
|
|
log.Println(err)
|
|
return
|
|
}
|
|
c := &connection{send: make(chan []byte, 256), ws: ws}
|
|
h.register <- c
|
|
go c.writePump()
|
|
c.readPump()
|
|
}
|