io.netty.example.http2.helloworld.server.Http2ServerInitializer Maven / Gradle / Ivy
/*
* Copyright 2014 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.example.http2.helloworld.server;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpMessage;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.HttpServerUpgradeHandler;
import io.netty.handler.codec.http.HttpServerUpgradeHandler.UpgradeCodec;
import io.netty.handler.codec.http.HttpServerUpgradeHandler.UpgradeCodecFactory;
import io.netty.handler.codec.http2.CleartextHttp2ServerUpgradeHandler;
import io.netty.handler.codec.http2.Http2CodecUtil;
import io.netty.handler.codec.http2.Http2ServerUpgradeCodec;
import io.netty.handler.ssl.SslContext;
import io.netty.util.AsciiString;
import io.netty.util.ReferenceCountUtil;
/**
* Sets up the Netty pipeline for the example server. Depending on the endpoint config, sets up the
* pipeline for NPN or cleartext HTTP upgrade to HTTP/2.
*/
public class Http2ServerInitializer extends ChannelInitializer {
private static final UpgradeCodecFactory upgradeCodecFactory = new UpgradeCodecFactory() {
@Override
public UpgradeCodec newUpgradeCodec(CharSequence protocol) {
if (AsciiString.contentEquals(Http2CodecUtil.HTTP_UPGRADE_PROTOCOL_NAME, protocol)) {
return new Http2ServerUpgradeCodec(new HelloWorldHttp2HandlerBuilder().build());
} else {
return null;
}
}
};
private final SslContext sslCtx;
private final int maxHttpContentLength;
public Http2ServerInitializer(SslContext sslCtx) {
this(sslCtx, 16 * 1024);
}
public Http2ServerInitializer(SslContext sslCtx, int maxHttpContentLength) {
if (maxHttpContentLength < 0) {
throw new IllegalArgumentException("maxHttpContentLength (expected >= 0): " + maxHttpContentLength);
}
this.sslCtx = sslCtx;
this.maxHttpContentLength = maxHttpContentLength;
}
@Override
public void initChannel(SocketChannel ch) {
if (sslCtx != null) {
configureSsl(ch);
} else {
configureClearText(ch);
}
}
/**
* Configure the pipeline for TLS NPN negotiation to HTTP/2.
*/
private void configureSsl(SocketChannel ch) {
ch.pipeline().addLast(sslCtx.newHandler(ch.alloc()), new Http2OrHttpHandler());
}
/**
* Configure the pipeline for a cleartext upgrade from HTTP to HTTP/2.0
*/
private void configureClearText(SocketChannel ch) {
final ChannelPipeline p = ch.pipeline();
final HttpServerCodec sourceCodec = new HttpServerCodec();
final HttpServerUpgradeHandler upgradeHandler = new HttpServerUpgradeHandler(sourceCodec, upgradeCodecFactory);
final CleartextHttp2ServerUpgradeHandler cleartextHttp2ServerUpgradeHandler =
new CleartextHttp2ServerUpgradeHandler(sourceCodec, upgradeHandler,
new HelloWorldHttp2HandlerBuilder().build());
p.addLast(cleartextHttp2ServerUpgradeHandler);
p.addLast(new SimpleChannelInboundHandler() {
@Override
protected void channelRead0(ChannelHandlerContext ctx, HttpMessage msg) throws Exception {
// If this handler is hit then no upgrade has been attempted and the client is just talking HTTP.
System.err.println("Directly talking: " + msg.protocolVersion() + " (no upgrade was attempted)");
ChannelPipeline pipeline = ctx.pipeline();
pipeline.addAfter(ctx.name(), null, new HelloWorldHttp1Handler("Direct. No Upgrade Attempted."));
pipeline.replace(this, null, new HttpObjectAggregator(maxHttpContentLength));
ctx.fireChannelRead(ReferenceCountUtil.retain(msg));
}
});
p.addLast(new UserEventLogger());
}
/**
* Class that logs any User Events triggered on this channel.
*/
private static class UserEventLogger extends ChannelInboundHandlerAdapter {
@Override
public void userEventTriggered(ChannelHandlerContext ctx, Object evt) {
System.out.println("User Event Triggered: " + evt);
ctx.fireUserEventTriggered(evt);
}
}
}