Method _connect

systemvm/agent/noVNC/core/rfb.js:707–763

()

    // ===== PRIVATE METHODS =====

    _connect() {
        Log.Debug(">> RFB.connect");

        if (this._url) {
            Log.Info(`connecting to ${this._url}`);
            this._sock.open(this._url, this._wsProtocols);
        } else {
            Log.Info(`attaching ${this._rawChannel} to Websock`);
            this._sock.attach(this._rawChannel);

            if (this._sock.readyState === 'closed') {
                throw Error("Cannot use already closed WebSocket/RTCDataChannel");
            }

            if (this._sock.readyState === 'open') {
                // FIXME: _socketOpen() can in theory call _fail(), which
                //        isn't allowed this early, but I'm not sure that can
                //        happen without a bug messing up our state variables
                this._socketOpen();
            }
        }

        // Make our elements part of the page
        this._target.appendChild(this._screen);

        this._gestures.attach(this._canvas);

        this._cursor.attach(this._canvas);
        this._refreshCursor();

        // Monitor size changes of the screen element
        this._resizeObserver.observe(this._screen);

        // Always grab focus on some kind of click event
        this._canvas.addEventListener("mousedown", this._eventHandlers.focusCanvas);
        this._canvas.addEventListener("touchstart", this._eventHandlers.focusCanvas);

        // Mouse events
        this._canvas.addEventListener('mousedown', this._eventHandlers.handleMouse);
        this._canvas.addEventListener('mouseup', this._eventHandlers.handleMouse);
        this._canvas.addEventListener('mousemove', this._eventHandlers.handleMouse);
        // Prevent middle-click pasting (see handler for why we bind to document)
        this._canvas.addEventListener('click', this._eventHandlers.handleMouse);
        // preventDefault() on mousedown doesn't stop this event for some
        // reason so we have to explicitly block it
        this._canvas.addEventListener('contextmenu', this._eventHandlers.handleMouse);

        // Wheel events
        this._canvas.addEventListener("wheel", this._eventHandlers.handleWheel);

        // Gesture events
        this._canvas.addEventListener("gesturestart", this._eventHandlers.handleGesture);
        this._canvas.addEventListener("gesturemove", this._eventHandlers.handleGesture);
        this._canvas.addEventListener("gestureend", this._eventHandlers.handleGesture);

        Log.Debug("<< RFB.connect");
    }