Respond with message on connect (api) (#550)

fix #549

bridge/api/api.go

@@ -102,6 +102,14 @@ func (b *Api) handleMessages(c echo.Context) error {
 func (b *Api) handleStream(c echo.Context) error {
 	c.Response().Header().Set(echo.HeaderContentType, echo.MIMEApplicationJSON)
 	c.Response().WriteHeader(http.StatusOK)
+	greet := config.Message{
+		Event:config.EVENT_API_CONNECTED,
+		Timestamp:time.Now(),
+	}
+	if err := json.NewEncoder(c.Response()).Encode(greet); err != nil {
+		return err
+	}
+	c.Response().Flush()
 	closeNotifier := c.Response().CloseNotify()
 	for {
 		select {

bridge/config/config.go

@@ -22,6 +22,7 @@ const (
 	EVENT_REJOIN_CHANNELS   = "rejoin_channels"
 	EVENT_USER_ACTION       = "user_action"
 	EVENT_MSG_DELETE        = "msg_delete"
+	EVENT_API_CONNECTED     = "api_connected"
 )
 
 type Message struct {