Examples with SMALLEST_MAX_CONCURRENT_STREAMS io.netty.handler.codec.http2.Http2CodecUtil.SMALLEST_MAX_CONCURRENT_STREAMS used on opensource projects

Example 1 with SMALLEST_MAX_CONCURRENT_STREAMS

use of io.netty.handler.codec.http2.Http2CodecUtil.SMALLEST_MAX_CONCURRENT_STREAMS in project servicetalk by apple.

the class H2PriorKnowledgeFeatureParityTest method clientRespectsSettingsFrame.

@ParameterizedTest(name = "{displayName} [{index}] client={0}, h2PriorKnowledge={1}")
@MethodSource("clientExecutors")
void clientRespectsSettingsFrame(HttpTestExecutionStrategy strategy, boolean h2PriorKnowledge) throws Exception {
    setUp(strategy, h2PriorKnowledge);
    assumeTrue(h2PriorKnowledge, "Only HTTP/2 supports SETTINGS frames");
    int expectedMaxConcurrent = 1;
    BlockingQueue<FilterableStreamingHttpConnection> connectionQueue = new LinkedBlockingQueue<>();
    BlockingQueue<Publisher<? extends ConsumableEvent<Integer>>> maxConcurrentPubQueue = new LinkedBlockingQueue<>();
    AtomicReference<Channel> serverParentChannelRef = new AtomicReference<>();
    CountDownLatch serverChannelLatch = new CountDownLatch(1);
    CountDownLatch serverSettingsAckLatch = new CountDownLatch(2);
    serverAcceptorChannel = bindH2Server(serverEventLoopGroup, new ChannelInitializer<Channel>() {

        @Override
        protected void initChannel(final Channel ch) {
            ch.pipeline().addLast(new EchoHttp2Handler());
        }
    }, parentPipeline -> parentPipeline.addLast(new ChannelInboundHandlerAdapter() {

        @Override
        public void channelActive(ChannelHandlerContext ctx) throws Exception {
            if (serverParentChannelRef.compareAndSet(null, ctx.channel())) {
                serverChannelLatch.countDown();
            }
            super.channelActive(ctx);
        }

        @Override
        public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
            if (msg instanceof Http2SettingsAckFrame) {
                serverSettingsAckLatch.countDown();
            }
            super.channelRead(ctx, msg);
        }
    }), identity());
    InetSocketAddress serverAddress = (InetSocketAddress) serverAcceptorChannel.localAddress();
    try (StreamingHttpClient client = forSingleAddress(HostAndPort.of(serverAddress)).protocols(h2PriorKnowledge ? h2Default() : h1Default()).executionStrategy(clientExecutionStrategy).appendConnectionFilter(conn -> new TestConnectionFilter(conn, connectionQueue, maxConcurrentPubQueue)).buildStreaming()) {
        Processor<Buffer, Buffer> requestPayload = newProcessor();
        client.request(client.post("/0").payloadBody(fromSource(requestPayload))).toFuture().get();
        serverChannelLatch.await();
        Channel serverParentChannel = serverParentChannelRef.get();
        serverParentChannel.writeAndFlush(new DefaultHttp2SettingsFrame(new Http2Settings().maxConcurrentStreams(expectedMaxConcurrent))).sync();
        Iterator<? extends ConsumableEvent<Integer>> maxItr = maxConcurrentPubQueue.take().toIterable().iterator();
        // Verify that the initial maxConcurrency value is the default number
        assertThat("No initial maxConcurrency value", maxItr.hasNext(), is(true));
        ConsumableEvent<Integer> next = maxItr.next();
        assertThat(next, is(notNullValue()));
        assertThat("First event is not the default", next.event(), is(SMALLEST_MAX_CONCURRENT_STREAMS));
        // We previously made a request, and intentionally didn't complete the request body. We want to verify
        // that we have received the SETTINGS frame reducing the total number of streams to 1.
        assertThat("No maxConcurrency value received", maxItr.hasNext(), is(true));
        next = maxItr.next();
        assertThat(next, is(notNullValue()));
        assertThat("maxConcurrency did not change to the expected value", next.event(), is(expectedMaxConcurrent));
        // Wait for a server to receive a settings ack
        serverSettingsAckLatch.await();
        // After this point we want to issue a new request and verify that client selects a new connection.
        Processor<Buffer, Buffer> requestPayload2 = newProcessor();
        client.request(client.post("/1").payloadBody(fromSource(requestPayload2))).toFuture().get();
        // We expect 2 connections to be created.
        assertNotSame(connectionQueue.take(), connectionQueue.take());
        requestPayload.onComplete();
        requestPayload2.onComplete();
    }
}