/
client.go
130 lines (115 loc) · 3.3 KB
/
client.go
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package ws
import (
"bytes"
"encoding/json"
"github.com/gorilla/websocket"
logger "github.com/sirupsen/logrus"
"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 = 1024
)
var (
newline = []byte{'\n'}
space = []byte{' '}
)
// Client is a middleman between the websocket connection and the hub.
type Client struct {
hub *Hub
// uid of user
uid string
// The websocket connection.
conn *websocket.Conn
// Buffered channel of outbound messages.
send chan []byte
// Subscribed message
channelSet *ChannelSet
}
// readPump pumps messages from the websocket connection to the hub.
//
// The application runs readPump in a per-connection goroutine. The application
// ensures that there is at most one reader on a connection by executing all
// reads from this goroutine.
func (c *Client) readPump() {
defer func() {
c.hub.unregister <- c
close(c.send)
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 {
_, message, err := c.conn.ReadMessage()
if err != nil {
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
logger.WithError(err).Error("read message error")
}
break
}
message = bytes.TrimSpace(bytes.Replace(message, newline, space, -1))
pkg := &WrapPackageReq{
Raw: message,
}
if err = json.Unmarshal(message, pkg); err != nil {
logger.WithError(err).WithField("package", string(message)).Error("call json.Unmarshal to PackageReq failed")
bytes, _ := encodePackageResp(MessageError, newNotSupportMessageError(pkg.Raw))
c.send <- bytes
} else {
if pkg.Subscribe != nil {
if *pkg.Subscribe {
c.channelSet.Add(pkg.Channel)
pkg.Sender = c
c.hub.broadcast <- pkg
} else {
c.channelSet.Remove(pkg.Channel)
}
} else {
pkg.Sender = c
c.hub.broadcast <- pkg
}
}
}
}
// writePump pumps messages from the hub to the websocket connection.
//
// A goroutine running writePump is started for each connection. The
// application ensures that there is at most one writer to a connection by
// executing all writes from this goroutine.
func (c *Client) writePump() {
ticker := time.NewTicker(pingPeriod)
defer func() {
ticker.Stop()
c.conn.Close()
}()
for {
select {
case message, ok := <-c.send:
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if !ok {
// The hub closed the channel.
c.conn.WriteMessage(websocket.CloseMessage, []byte{})
return
}
c.conn.WriteMessage(websocket.TextMessage, message)
// Add queued chat messages to the current websocket message.
n := len(c.send)
for i := 0; i < n; i++ {
c.conn.WriteMessage(websocket.TextMessage, <-c.send)
}
case <-ticker.C:
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if err := c.conn.WriteMessage(websocket.PingMessage, nil); err != nil {
logger.WithError(err).Debug("write ping message error")
return
}
}
}
}