func (m *WebSocketHandler) writer() {
l.If("wswriter process - %s - starting", m.subscriber.id)
defer close(m.send)
defer close(m.closeListener)
defer m.ws.Close()
defer l.If("wswriter process - %s - stopped", m.subscriber.id)
for {
select {
case message := <-m.send:
jsonData, _ := json.Marshal(message)
l.If("wswriter process - %s - serve json %s", m.subscriber.id, jsonData)
err := websocket.Message.Send(m.ws, string(jsonData))
if err != nil {
l.Ef("wswriter process - %s - error writing to socket: %s", m.subscriber.id, err.Error())
}
case command := <-m.subscriber.feedListener:
var response = SubscriberResponse{Status: 1, Commands: command.data}
jsonData, _ := json.Marshal(response)
l.If("wswriter process - %s - serve data: %s", m.subscriber.id, string(jsonData))
err := websocket.Message.Send(m.ws, string(jsonData))
if err != nil {
l.Ef("wswriter process - %s - error writing to socket: %s", m.subscriber.id, err.Error())
}
case <-m.closeListener:
l.If("wswriter process - %s - received close command", m.subscriber.id)
return
case <-time.After(30 * time.Second):
l.If("wswriter process - %s - alive", m.subscriber.id)
}
}
}
/**
* Http request handler
*/
func (h *Hub) ServeHTTP(w http.ResponseWriter, r *http.Request) {
defer func() {
if x := recover(); x != nil {
l.Ef("request %s caused error from %s {%s}: %v", r.URL.Path, r.RemoteAddr, r.Form.Encode(), x)
}
}()
w.Header().Set("Access-Control-Allow-Origin", "*")
parts := strings.Split(r.URL.Path, "/")
command := parts[1]
r.ParseForm()
startTime := time.Now()
l.If("http serving request %s from %s {%s}", r.URL.Path, r.RemoteAddr, r.Form.Encode())
mediator := HttpDataMediator{w: w, r: r}
h.route(command, &mediator)
delay := float64(time.Now().Sub(startTime).Nanoseconds()) / 1000000.0
l.If("http Served request %s from %s {%s} took %f ms", r.URL.Path, r.RemoteAddr, r.Form.Encode(), delay)
}
func (m *WebSocketHandler) reader() {
l.I("wsreader process - starting")
var subscriberId string = "anonymous"
for {
var message string
err := websocket.Message.Receive(m.ws, &message)
if err != nil {
l.If("wsreader process - %s - error reading from socket: %s", subscriberId, err.Error())
break
}
l.If("wsreader process - read from socket %s", string(message))
var command = new(WebSocketCommand)
err = json.Unmarshal([]byte(message), command)
if err != nil {
l.Ef("wsreader process - %s - error unmarshal commad %s", subscriberId, err.Error())
break
}
var mediator = WebSocketDataMediator{send: m.send, command: *command, RequestId: command.RequestId}
// special commands - keep alive and subscribe
if command.Command == "keepAlive" {
var subscriber = m.hub.subscribers[m.subscriber.id]
// subscriber not found
if subscriber == nil {
l.Wf("wsreader process - %s - timed out!", subscriberId)
break
} else {
subscriber.lastRequest = time.Now().Unix()
}
} else if command.Command == "subscribe" {
var channels = strings.Split(mediator.ReadParameter("channels"), ",")
var responseListener = make(chan Subscriber)
m.hub.subscriberCommandListener <- HubSubscriberRequest{command: Subscribe, channels: channels, responseListener: responseListener}
m.subscriber = <-responseListener
subscriberId = m.subscriber.id
go m.writer()
mediator.WriteResponse(map[string]interface{}{"command": "subscribe", "subscriberId": m.subscriber.id}, "json")
close(responseListener)
} else {
m.hub.route(command.Command, &mediator)
}
}
m.closeListener <- true
l.If("wsreader process - %s - stopped", subscriberId)
m.ws.Close()
}
func (h *Hub) createSubscriber(channels []string) Subscriber {
l.If("subscriber creating with channels %s", channels)
var id, err = newUUID()
if err != nil {
l.Ef("Error creation new uuid %s", err.Error())
}
subscriber := Subscriber{
id: id,
commandListener: make(chan SubscriberControlCommand, 10),
feedListener: make(chan SubscriberFeedCommand, subscriberQueueSize),
channels: make(map[string]*SubscriberChannel),
}
channels = append(channels, fmt.Sprintf("private_%s", id))
h.addChannelsToSubscriber(channels, &subscriber)
subscriber.lastRequest = time.Now().Unix()
go subscriber.subscriberCommandProcess(h)
h.subscribers[id] = &subscriber
l.If("subscriber %s created with channels %s", id, channels)
return subscriber
}