WebSocketClientProtocolHandshakeHandler Class — netty Architecture

Source Code

codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketClientProtocolHandshakeHandler.java lines 30–134

class WebSocketClientProtocolHandshakeHandler extends ChannelInboundHandlerAdapter {
    private static final long DEFAULT_HANDSHAKE_TIMEOUT_MS = 10000L;

    private final WebSocketClientHandshaker handshaker;
    private final long handshakeTimeoutMillis;
    private ChannelHandlerContext ctx;
    private ChannelPromise handshakePromise;

    WebSocketClientProtocolHandshakeHandler(WebSocketClientHandshaker handshaker) {
        this(handshaker, DEFAULT_HANDSHAKE_TIMEOUT_MS);
    }

    WebSocketClientProtocolHandshakeHandler(WebSocketClientHandshaker handshaker, long handshakeTimeoutMillis) {
        this.handshaker = handshaker;
        this.handshakeTimeoutMillis = checkPositive(handshakeTimeoutMillis, "handshakeTimeoutMillis");
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        this.ctx = ctx;
        handshakePromise = ctx.newPromise();
    }

    @Override
    public void channelActive(final ChannelHandlerContext ctx) throws Exception {
        ctx.fireChannelActive();
        handshaker.handshake(ctx.channel()).addListener(future -> {
            if (!future.isSuccess()) {
                handshakePromise.tryFailure(future.cause());
                ctx.fireExceptionCaught(future.cause());
            } else {
                ctx.fireUserEventTriggered(
                        ClientHandshakeStateEvent.HANDSHAKE_ISSUED);
            }
        });
        applyHandshakeTimeout();
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        if (!handshakePromise.isDone()) {
            handshakePromise.tryFailure(new WebSocketClientHandshakeException("channel closed with handshake " +
                                                                              "in progress"));
        }

        super.channelInactive(ctx);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        if (!(msg instanceof FullHttpResponse)) {
            ctx.fireChannelRead(msg);
            return;
        }

        FullHttpResponse response = (FullHttpResponse) msg;
        try {
            if (!handshaker.isHandshakeComplete()) {
                handshaker.finishHandshake(ctx.channel(), response);
                handshakePromise.trySuccess();
                ctx.fireUserEventTriggered(
                        WebSocketClientProtocolHandler.ClientHandshakeStateEvent.HANDSHAKE_COMPLETE);
                ctx.pipeline().remove(this);
                return;
            }
            throw new IllegalStateException("WebSocketClientHandshaker should have been non finished yet");
        } finally {
            response.release();
        }
    }

    private void applyHandshakeTimeout() {
        final ChannelPromise localHandshakePromise = handshakePromise;
        if (handshakeTimeoutMillis <= 0 || localHandshakePromise.isDone()) {
            return;
        }

        final Future<?> timeoutFuture = ctx.executor().schedule(new Runnable() {
            @Override
            public void run() {
                if (localHandshakePromise.isDone()) {