/
client.go
87 lines (79 loc) · 1.76 KB
/
client.go
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package main
import (
"context"
"log"
"net/http"
"time"
"github.com/gorilla/websocket"
)
const (
writeWait = 10 * time.Second
pongWait = 60 * time.Second
pingPeriod = pongWait * 9 / 10
maxMessageSize = 512
)
const (
channelGeneral = "general"
)
var (
upgrader = websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool {
return true
},
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
)
type Client struct {
conn *websocket.Conn
}
func (c *Client) readPump() {
defer func() {
_ = c.conn.Close()
}()
c.conn.SetReadLimit(maxMessageSize)
c.conn.SetPongHandler(func(string) error { _ = c.conn.SetReadDeadline(time.Now().Add(pongWait)); return nil })
_ = c.conn.SetReadDeadline(time.Now().Add(pongWait))
for {
_, message, err := c.conn.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
log.Println(err)
}
break
}
if err := RDB.Publish(context.Background(), channelGeneral, message).Err(); err != nil {
log.Println(err)
}
}
}
func (c *Client) writePump() {
ticker := time.NewTicker(pingPeriod)
sub := RDB.Subscribe(context.Background(), channelGeneral)
defer func() {
ticker.Stop()
_ = c.conn.Close()
_ = sub.Close()
}()
for {
select {
case msg := <-sub.Channel():
_ = c.conn.SetWriteDeadline(time.Now().Add(writeWait))
w, err := c.conn.NextWriter(websocket.TextMessage)
if err != nil {
return
}
if _, err := w.Write([]byte(msg.Payload)); err != nil {
log.Println(err)
}
if err := w.Close(); err != nil {
return
}
case <-ticker.C:
_ = c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if err := c.conn.WriteMessage(websocket.PingMessage, nil); err != nil {
return
}
}
}
}