e24a5d8839
Motivation: This allows using handlers for Streams in normal Netty-style. Frames are read/written to the channel as messages, not directly as a callback/method call. Handlers allow mixing and can ease HTTP/1 and HTTP/2 interoperability by eventually supporting HTTP/1 handlers in HTTP/2 and vise versa. Modifications: New handler Http2MultiplexCodec that converts from the current HTTP/2 API to a message-based API and child channels for streams. Result: The basics are done for server-side: new streams trigger creation of new channels in much the same appearance to how new connections trigger new channel creation. The basic frames HEADERS and DATA are handled, but also GOAWAY and RST_STREAM. Inbound flow control is implemented, but outbound is not. That will be done later, along with not completing write promises on the child channel until the write actually completes on the parent. There is not yet support for outbound priority/weight, push promises, and many other features. There is a generic Object that may be set on stream frames. This also paves the way for client-side support which needs a way to refer to yet-to-be-created streams (due to how HEADERS allocates a stream id, and the allocation order must be the same as transmission order).
97 lines
4.2 KiB
Java
97 lines
4.2 KiB
Java
/*
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* Copyright 2016 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.example.http2.helloworld.multiplex.server;
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import io.netty.bootstrap.ServerBootstrap;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelOption;
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import io.netty.channel.EventLoopGroup;
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import io.netty.channel.nio.NioEventLoopGroup;
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import io.netty.channel.socket.nio.NioServerSocketChannel;
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import io.netty.handler.codec.http2.Http2SecurityUtil;
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import io.netty.handler.logging.LogLevel;
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import io.netty.handler.logging.LoggingHandler;
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import io.netty.handler.ssl.ApplicationProtocolConfig;
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import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
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import io.netty.handler.ssl.ApplicationProtocolConfig.SelectedListenerFailureBehavior;
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import io.netty.handler.ssl.ApplicationProtocolConfig.SelectorFailureBehavior;
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import io.netty.handler.ssl.ApplicationProtocolNames;
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import io.netty.handler.ssl.OpenSsl;
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import io.netty.handler.ssl.SslContext;
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import io.netty.handler.ssl.SslContextBuilder;
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import io.netty.handler.ssl.SslProvider;
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import io.netty.handler.ssl.SupportedCipherSuiteFilter;
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import io.netty.handler.ssl.util.SelfSignedCertificate;
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/**
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* A HTTP/2 Server that responds to requests with a Hello World. Once started, you can test the
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* server with the example client.
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*
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* <p>This example is making use of the "multiplexing" http2 API, where streams are mapped to child
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* Channels. This API is very experimental and incomplete.
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*/
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public final class Http2Server {
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static final boolean SSL = System.getProperty("ssl") != null;
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static final int PORT = Integer.parseInt(System.getProperty("port", SSL? "8443" : "8080"));
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public static void main(String[] args) throws Exception {
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// Configure SSL.
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final SslContext sslCtx;
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if (SSL) {
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SslProvider provider = OpenSsl.isAlpnSupported() ? SslProvider.OPENSSL : SslProvider.JDK;
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SelfSignedCertificate ssc = new SelfSignedCertificate();
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sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey())
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.sslProvider(provider)
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/* NOTE: the cipher filter may not include all ciphers required by the HTTP/2 specification.
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* Please refer to the HTTP/2 specification for cipher requirements. */
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.ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
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.applicationProtocolConfig(new ApplicationProtocolConfig(
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Protocol.ALPN,
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// NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
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SelectorFailureBehavior.NO_ADVERTISE,
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// ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
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SelectedListenerFailureBehavior.ACCEPT,
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ApplicationProtocolNames.HTTP_2,
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ApplicationProtocolNames.HTTP_1_1))
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.build();
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} else {
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sslCtx = null;
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}
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// Configure the server.
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EventLoopGroup group = new NioEventLoopGroup();
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try {
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ServerBootstrap b = new ServerBootstrap();
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b.option(ChannelOption.SO_BACKLOG, 1024);
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b.group(group)
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.channel(NioServerSocketChannel.class)
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.handler(new LoggingHandler(LogLevel.INFO))
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.childHandler(new Http2ServerInitializer(sslCtx));
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Channel ch = b.bind(PORT).sync().channel();
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System.err.println("Open your HTTP/2-enabled web browser and navigate to " +
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(SSL? "https" : "http") + "://127.0.0.1:" + PORT + '/');
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ch.closeFuture().sync();
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} finally {
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group.shutdownGracefully();
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}
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}
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}
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