/
conn.go
103 lines (91 loc) · 2.17 KB
/
conn.go
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package main
import (
"github.com/gorilla/websocket"
"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 = 30 * 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
)
type connection struct {
control chan *channel
channel *channel
send chan []byte
ws *websocket.Conn
h *hub
path string
}
func newConnection(ws *websocket.Conn, h *hub, path string) *connection {
return &connection{
control: make(chan *channel, 1),
send: make(chan []byte, 256),
ws: ws,
h: h,
path: path,
}
}
func (c *connection) run() {
c.h.queue <- command{cmd: SUBSCRIBE, conn: c, path: c.path}
c.channel = <-c.control
close(c.control)
incr("websockets", 1)
defer func() {
decr("websockets", 1)
c.channel.queue <- command{cmd: UNSUBSCRIBE, conn: c, path: c.path}
}()
go c.writer()
c.reader()
}
func (c *connection) reader() {
c.ws.SetReadLimit(maxMessageSize)
c.ws.SetReadDeadline(time.Now().Add(pongWait))
c.ws.SetPongHandler(func(s string) error { c.ws.SetReadDeadline(time.Now().Add(pongWait)); return nil })
for {
_, message, err := c.ws.ReadMessage()
if err != nil {
break
}
// empty message: echo only, no broadcast
if len(message) == 0 {
c.send <- []byte{}
continue
}
c.channel.queue <- command{cmd: PUBLISH, path: c.path, text: message}
mark("websocketmsgs", 1)
}
c.ws.Close()
}
func (c *connection) writer() {
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
}
mark("sends", 1)
case <-ticker.C:
if err := c.write(websocket.PingMessage, []byte{}); err != nil {
return
}
}
}
}
func (c *connection) write(mt int, payload []byte) error {
c.ws.SetWriteDeadline(time.Now().Add(writeWait))
return c.ws.WriteMessage(mt, payload)
}