/
client.go
100 lines (85 loc) · 1.92 KB
/
client.go
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package socket
import (
"log"
"net/http"
"time"
"github.com/gorilla/websocket"
)
const (
writeWait = 10 * time.Second
pongWait = 5 * time.Second
pingPeriod = (pongWait * 9) / 10
maxMessageSize = 512
)
var (
newline = []byte{'\n'}
space = []byte{' '}
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
// allowing all origins!!
CheckOrigin: func(r *http.Request) bool {
return true
},
}
func ServeWebsocket(w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Printf("error: %v", err)
return
}
client := &Client{hub: H, conn: conn, send: make(chan interface{}, 256)}
client.hub.register <- client
go client.read()
go client.write()
}
type Client struct {
hub *hub
// the websocket connection
conn *websocket.Conn
// bufferend channel of outbound messages
send chan interface{}
}
func (c *Client) read() {
defer func() {
c.hub.unregister <- c
c.conn.Close()
}()
c.conn.SetReadLimit(maxMessageSize)
c.conn.SetReadDeadline(time.Now().Add(pongWait))
c.conn.SetPongHandler(func(string) error { c.conn.SetReadDeadline(time.Now().Add(pongWait)); return nil })
for {
_, msg, err := c.conn.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway) {
log.Printf("error: %v", err)
}
break
}
log.Printf("Recieved message from socket: %s", msg)
}
}
func (c *Client) write() {
ticker := time.NewTicker(pingPeriod)
defer func() {
ticker.Stop()
c.conn.Close()
}()
for {
select {
case msg, ok := <-c.send:
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if !ok {
c.conn.WriteMessage(websocket.CloseMessage, []byte{})
return
}
c.conn.WriteJSON(msg)
case <-ticker.C:
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if err := c.conn.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
return
}
}
}
}