// wsHandler is a WebSocket server that handles requests from the WebSocket client in the form of:
// 1. { 'cmd': 'register', 'roomid': $ROOM, 'clientid': $CLIENT' },
// which binds the WebSocket client to a client ID and room ID.
// A client should send this message only once right after the connection is open.
// or
// 2. { 'cmd': 'send', 'msg': $MSG }, which sends the message to the other client of the room.
// It should be sent to the server only after 'regiser' has been sent.
// The message may be cached by the server if the other client has not joined.
//
// Unexpected messages will cause the WebSocket connection to be closed.
func (c *Collider) wsHandler(ws *websocket.Conn) {
var rid, cid string
registered := false
var msg wsClientMsg
loop:
for {
err := ws.SetReadDeadline(time.Now().Add(time.Duration(wsReadTimeoutSec) * time.Second))
if err != nil {
c.wsError("ws.SetReadDeadline error: "+err.Error(), ws)
break
}
err = websocket.JSON.Receive(ws, &msg)
if err != nil {
if err.Error() != "EOF" {
c.wsError("websocket.JSON.Receive error: "+err.Error(), ws)
}
break
}
switch msg.Cmd {
case "register":
if registered {
c.wsError("Duplicated register request", ws)
break loop
}
if msg.RoomID == "" || msg.ClientID == "" {
c.wsError("Invalid register request: missing 'clientid' or 'roomid'", ws)
break loop
}
if err = c.roomTable.register(msg.RoomID, msg.ClientID, ws); err != nil {
c.wsError(err.Error(), ws)
break loop
}
registered, rid, cid = true, msg.RoomID, msg.ClientID
c.dash.incrWs()
defer c.roomTable.deregister(rid, cid)
break
case "send":
if !registered {
c.wsError("Client not registered", ws)
break loop
}
if msg.Msg == "" {
c.wsError("Invalid send request: missing 'msg'", ws)
break loop
}
c.roomTable.send(rid, cid, msg.Msg)
break
default:
c.wsError("Invalid message: unexpected 'cmd'", ws)
break
}
}
// This should be unnecessary but just be safe.
ws.Close()
}
func setDeadlines(ws *websocket.Conn) {
if err := ws.SetDeadline(time.Now().Add(100 * time.Hour)); err != nil {
log.Fatal(err)
}
if err := ws.SetReadDeadline(time.Now().Add(100 * time.Hour)); err != nil {
log.Fatal(err)
}
if err := ws.SetWriteDeadline(time.Now().Add(100 * time.Hour)); err != nil {
log.Fatal(err)
}
}
func CalcServer(ws *websocket.Conn) {
defer ws.Close()
ws.SetReadDeadline(time.Now().Add(time.Second * time.Duration(*Timeout)))
timeout := time.NewTimer(time.Second * time.Duration(*Timeout))
for {
select {
case <-timeout.C:
log.Printf("timeout exceeded for connection")
return
default:
var req []byte
err := websocket.Message.Receive(ws, &req)
if err != nil {
log.Printf("error receiving %s", err)
}
var request network.Request
err = proto.Unmarshal(req, &request)
if err != nil {
log.Printf("error unmarshalling request: %s", err)
return
}
log.Printf("recevied: %s", request)
task := Task{ws, request.Id}
calc := rpn.New(base.New(strings.NewReader(request.Expression)))
expr, err := calc.Parse()
if err != nil {
log.Printf("could not parse expression: %s", err)
task.error(err)
return
}
result, err := expr.Evaluate()
if err != nil {
log.Printf("could not evaluate expression: %s", err)
task.error(err)
return
}
log.Printf("calculated result: %f", result)
task.success(result)
return
}
}
}
func (hd *wshandler) Handle(conn *websocket.Conn) {
log.LogInfo("new websocket client: ", conn.RemoteAddr())
if !App.MustAppReady {
log.LogError("must app not ready")
conn.Close()
return
}
r := &s2c.Rpc{}
r.Sender = proto.String(App.Name)
h, p, err := GetLogin()
if err != nil {
e := &s2c.Error{}
e.ErrorNo = proto.Int32(share.ERROR_NOLOGIN)
b, err := proto.Marshal(e)
if err != nil {
conn.Close()
log.LogFatalf(err)
}
r.Servicemethod = proto.String("Login.Error")
r.Data = b
data, err := proto.Marshal(r)
if err != nil {
log.LogFatalf(err)
return
}
out, _ := util.CreateMsg(nil, data, share.S2C_RPC)
err = websocket.Message.Send(conn, out)
if err != nil {
conn.Close()
log.LogError(err)
return
}
} else {
l := &s2c.Login{}
l.Host = proto.String(h)
l.Port = proto.Int32(int32(p))
b, err := proto.Marshal(l)
if err != nil {
conn.Close()
log.LogFatalf(err)
}
log.LogInfo("client choose login:"******":", p)
r.Servicemethod = proto.String("Login.LoginInfo")
r.Data = b
data, err := proto.Marshal(r)
if err != nil {
log.LogFatalf(err)
return
}
out, _ := util.CreateMsg(nil, data, share.S2C_RPC)
err = websocket.Message.Send(conn, out)
if err != nil {
conn.Close()
log.LogError(err)
return
}
}
conn.SetReadDeadline(time.Now().Add(time.Second * 10))
websocket.Message.Receive(conn, hd.ignore[:])
log.LogMessage("client close: ", conn.RemoteAddr())
conn.Close()
}
// Subscriber Handle is the websocket handle for sub request.
func SubscribeHandle(ws *websocket.Conn) {
addr := ws.Request().RemoteAddr
params := ws.Request().URL.Query()
// get subscriber key
key := params.Get("key")
if key == "" {
ws.Write(ParamReply)
log.Warn("<%s> key param error", addr)
return
}
// get heartbeat second
heartbeatStr := params.Get("heartbeat")
i, err := strconv.Atoi(heartbeatStr)
if err != nil {
ws.Write(ParamReply)
log.Error("<%s> user_key:\"%s\" heartbeat argument error(%v)", addr, key, err)
return
}
if i < minHearbeatSec {
ws.Write(ParamReply)
log.Warn("<%s> user_key:\"%s\" heartbeat argument error, less than %d", addr, key, minHearbeatSec)
return
}
heartbeat := i + delayHeartbeatSec
token := params.Get("token")
version := params.Get("ver")
log.Info("<%s> subscribe to key = %s, heartbeat = %d, token = %s, version = %s", addr, key, heartbeat, token, version)
// fetch subscriber from the channel
c, err := UserChannel.Get(key, true)
if err != nil {
log.Warn("<%s> user_key:\"%s\" can't get a channel (%s)", addr, key, err)
if err == ErrChannelKey {
ws.Write(NodeReply)
} else {
ws.Write(ChannelReply)
}
return
}
// auth token
if ok := c.AuthToken(key, token); !ok {
ws.Write(AuthReply)
log.Error("<%s> user_key:\"%s\" auth token \"%s\" failed", addr, key, token)
return
}
// add a conn to the channel
connElem, err := c.AddConn(key, &Connection{Conn: ws, Proto: WebsocketProto, Version: version})
if err != nil {
log.Error("<%s> user_key:\"%s\" add conn error(%v)", addr, key, err)
return
}
// blocking wait client heartbeat
reply := ""
begin := time.Now().UnixNano()
end := begin + Second
for {
// more then 1 sec, reset the timer
if end-begin >= Second {
if err = ws.SetReadDeadline(time.Now().Add(time.Second * time.Duration(heartbeat))); err != nil {
log.Error("<%s> user_key:\"%s\" websocket.SetReadDeadline() error(%v)", addr, key, err)
break
}
begin = end
}
if err = websocket.Message.Receive(ws, &reply); err != nil {
log.Error("<%s> user_key:\"%s\" websocket.Message.Receive() error(%v)", addr, key, err)
break
}
if reply == Heartbeat {
if _, err = ws.Write(HeartbeatReply); err != nil {
log.Error("<%s> user_key:\"%s\" write heartbeat to client error(%s)", addr, key, err)
break
}
log.Debug("<%s> user_key:\"%s\" receive heartbeat", addr, key)
} else {
log.Warn("<%s> user_key:\"%s\" unknown heartbeat protocol", addr, key)
break
}
end = time.Now().UnixNano()
}
// remove exists conn
if err := c.RemoveConn(key, connElem); err != nil {
log.Error("<%s> user_key:\"%s\" remove conn error(%v)", addr, key, err)
}
return
}