/
client.go
155 lines (136 loc) · 3.21 KB
/
client.go
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package wss
import (
"encoding/json"
"log"
"time"
"github.com/gorilla/websocket"
"github.com/labstack/gommon/random"
)
// Client is a middleman between the websocket connection and the hub.
type Client struct {
srv *Server
id string
// The websocket connection.
conn *websocket.Conn
// Buffered channel of outbound messages.
send chan *Reply
closed chan bool
routers map[string]IRouter
}
func newClient(srv *Server, conn *websocket.Conn, id string) *Client {
if id == "" {
id = generator()
}
return &Client{
srv: srv,
id: id,
conn: conn,
send: make(chan *Reply, 256),
closed: make(chan bool),
routers: make(map[string]IRouter),
}
}
// 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.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) {
log.Printf("error: %v", err)
}
break
}
var msg Message
if err := json.Unmarshal(message, &msg); err != nil {
log.Printf("error: %v", err)
break
}
if router, ok := c.srv.routers[msg.Channel]; ok {
switch msg.Command {
case cmdSubscribe:
if err := router.Register(c, &msg); err == nil {
c.routers[msg.Channel] = router
}
case cmdUnsubscribe:
router.Unregister(c, &msg)
delete(c.routers, msg.Channel)
default:
router.Perform(c, &msg)
}
}
}
}
// 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.close()
}()
for {
select {
case reply, ok := <-c.send:
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if !ok {
// The hub closed the channel.
c.conn.WriteMessage(websocket.CloseMessage, []byte{})
return
}
if err := c.conn.WriteJSON(reply); err != nil {
return
}
case <-ticker.C:
c.conn.SetWriteDeadline(time.Now().Add(writeWait))
if err := c.conn.WriteMessage(websocket.PingMessage, nil); err != nil {
return
}
}
}
}
func (c *Client) run() {
c.srv.hub.register <- c
go c.readPump()
go c.writePump()
}
func (c *Client) close() {
select {
case <-c.closed:
default:
close(c.closed)
close(c.send)
c.conn.Close()
for _, r := range c.routers {
r.Unregister(c, nil)
}
c.srv.hub.unregister <- c
}
}
// Connection return websocket connection
func (c *Client) Connection() *websocket.Conn {
return c.conn
}
// Reply send reply to client
func (c *Client) Reply(reply *Reply) {
select {
case <-c.closed:
default:
c.send <- reply
}
}
func generator() string {
return random.String(32)
}