1 /*
2 * Copyright 2020 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty.handler.codec.http3;
17
18 import io.netty.channel.ChannelInitializer;
19 import io.netty.channel.ChannelPipeline;
20 import io.netty.handler.codec.quic.QuicStreamChannel;
21 import io.netty.util.internal.StringUtil;
22
23 /**
24 * Abstract base class that users can extend to init HTTP/3 request-streams. This initializer
25 * will automatically add HTTP/3 codecs etc to the {@link ChannelPipeline} as well.
26 */
27 public abstract class Http3RequestStreamInitializer extends ChannelInitializer<QuicStreamChannel> {
28
29 @Override
30 protected final void initChannel(QuicStreamChannel ch) {
31 ChannelPipeline pipeline = ch.pipeline();
32 Http3ConnectionHandler connectionHandler = ch.parent().pipeline().get(Http3ConnectionHandler.class);
33 if (connectionHandler == null) {
34 throw new IllegalStateException("Couldn't obtain the " +
35 StringUtil.simpleClassName(Http3ConnectionHandler.class) + " of the parent Channel");
36 }
37
38 Http3RequestStreamEncodeStateValidator encodeStateValidator = new Http3RequestStreamEncodeStateValidator();
39 Http3RequestStreamDecodeStateValidator decodeStateValidator = new Http3RequestStreamDecodeStateValidator();
40
41 // Add the encoder and decoder in the pipeline so we can handle Http3Frames
42 pipeline.addLast(connectionHandler.newCodec(encodeStateValidator, decodeStateValidator));
43 // Add the handler that will validate what we write and receive on this stream.
44 pipeline.addLast(encodeStateValidator);
45 pipeline.addLast(decodeStateValidator);
46 pipeline.addLast(connectionHandler.newRequestStreamValidationHandler(ch, encodeStateValidator,
47 decodeStateValidator));
48 initRequestStream(ch);
49 }
50
51 /**
52 * Init the {@link QuicStreamChannel} to handle {@link Http3RequestStreamFrame}s. At the point of calling this
53 * method it is already valid to write {@link Http3RequestStreamFrame}s as the codec is already in the pipeline.
54 * @param ch the {QuicStreamChannel} for the request stream.
55 */
56 protected abstract void initRequestStream(QuicStreamChannel ch);
57 }