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wsClient.go
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wsClient.go
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package reload
import (
"log"
"net/http"
"time"
"github.com/gorilla/websocket"
)
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
)
var (
newline = []byte{'\n'}
space = []byte{' '}
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
// Client is an middleman between the websocket connection and the hub.
type Client struct {
hub *Hub
// The websocket connection.
conn *websocket.Conn
// Buffered channel of outbound messages.
send chan []byte
}
// readPump pumps messages from the websocket connection to the hub.
func (c *Client) readPump() {
defer func() {
c.hub.unregister <- c
c.conn.Close()
}()
for {
_, _, err := c.conn.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway) {
log.Printf("An error happened when reading from the Websocket client: %v", err)
}
break
}
}
}
// write writes a message with the given message type and payload.
func (c *Client) write(mt int, payload []byte) error {
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
return c.conn.WriteMessage(mt, payload)
}
// writePump pumps messages from the hub to the websocket connection.
func (c *Client) writePump() {
ticker := time.NewTicker(pingPeriod)
defer func() {
ticker.Stop()
c.conn.Close()
}()
for {
select {
case message, ok := <-c.send:
if !ok {
// The hub closed the channel.
c.write(websocket.CloseMessage, []byte{})
return
}
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
w, err := c.conn.NextWriter(websocket.TextMessage)
if err != nil {
return
}
w.Write(message)
n := len(c.send)
for i := 0; i < n; i++ {
w.Write(newline)
w.Write(<-c.send)
}
if err := w.Close(); 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(hub *Hub, w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println(err)
return
}
client := &Client{hub: hub, conn: conn, send: make(chan []byte, 256)}
client.hub.register <- client
go client.writePump()
client.readPump()
}