initChannel() — netty Function Reference

Source Code

codec-http3/src/main/java/io/netty/handler/codec/http3/Http3PushStreamServerInitializer.java lines 40–70

    @Override
    protected final void initChannel(QuicStreamChannel ch) {
        if (!isServerInitiatedQuicStream(ch)) {
            throw new IllegalArgumentException("Using server push stream initializer for client stream: " +
                    ch.streamId());
        }
        Http3CodecUtils.verifyIsUnidirectional(ch);

        // We need to write stream type into the stream before doing anything else.
        // See https://tools.ietf.org/html/draft-ietf-quic-http-32#section-6.2.1
        // Just allocate 16 bytes which would be the max needed to write 2 variable length ints.
        ByteBuf buffer = ch.alloc().buffer(16);
        writeVariableLengthInteger(buffer, Http3CodecUtils.HTTP3_PUSH_STREAM_TYPE);
        writeVariableLengthInteger(buffer, pushId);
        ch.write(buffer);

        Http3ConnectionHandler connectionHandler = Http3CodecUtils.getConnectionHandlerOrClose(ch.parent());
        if (connectionHandler == null) {
            // connection should have been closed
            return;
        }

        ChannelPipeline pipeline = ch.pipeline();
        Http3RequestStreamEncodeStateValidator encodeStateValidator = new Http3RequestStreamEncodeStateValidator();
        // Add the encoder and decoder in the pipeline so we can handle Http3Frames
        pipeline.addLast(connectionHandler.newCodec(encodeStateValidator, NO_STATE));
        pipeline.addLast(encodeStateValidator);
        // Add the handler that will validate what we write and receive on this stream.
        pipeline.addLast(connectionHandler.newPushStreamValidationHandler(ch, NO_STATE));
        initPushStream(ch);
    }