ba28679775
Motivation: The examples have not been updated since long time ago, showing various issues fixed in this commit. Modifications: - Overall simplification to reduce LoC - Use system properties to get options instead of parsing args. - Minimize option validation - Just use System.out/err instead of Logger - Do not pass config as parameters - just access it directly - Move the main logic to main(String[]) instead of creating a new instance meaninglessly - Update netty-build-21 to make checkstyle not complain - Remove 'throws Exception' clause if possible - Line wrap at 120 (previously at 80) - Add an option to enable SSL for most examples - Use ChannelFuture.sync() instead of await() - Use System.out for the actual result. Use System.err otherwise. - Delete examples that are not very useful: - websocket/html5 - websocketx/sslserver - localecho/multithreaded - Add run-example.sh which simplifies launching an example from command line Result: Shorter and simpler examples. A user can focus more on what it actually does than miscellaneous stuff. A user can launch an example very easily.
136 lines
6.2 KiB
Java
136 lines
6.2 KiB
Java
/*
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* Copyright 2012 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 org.jboss.netty.example.http.websocketx.autobahn;
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import org.jboss.netty.buffer.ChannelBuffers;
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import org.jboss.netty.channel.ChannelFuture;
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import org.jboss.netty.channel.ChannelFutureListener;
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import org.jboss.netty.channel.ChannelHandlerContext;
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import org.jboss.netty.channel.ExceptionEvent;
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import org.jboss.netty.channel.MessageEvent;
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import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
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import org.jboss.netty.handler.codec.http.DefaultHttpResponse;
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import org.jboss.netty.handler.codec.http.HttpHeaders;
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import org.jboss.netty.handler.codec.http.HttpRequest;
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import org.jboss.netty.handler.codec.http.HttpResponse;
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import org.jboss.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
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import org.jboss.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
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import org.jboss.netty.handler.codec.http.websocketx.ContinuationWebSocketFrame;
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import org.jboss.netty.handler.codec.http.websocketx.PingWebSocketFrame;
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import org.jboss.netty.handler.codec.http.websocketx.PongWebSocketFrame;
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import org.jboss.netty.handler.codec.http.websocketx.TextWebSocketFrame;
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import org.jboss.netty.handler.codec.http.websocketx.WebSocketFrame;
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import org.jboss.netty.handler.codec.http.websocketx.WebSocketServerHandshaker;
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import org.jboss.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory;
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import org.jboss.netty.logging.InternalLogger;
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import org.jboss.netty.logging.InternalLoggerFactory;
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import org.jboss.netty.util.CharsetUtil;
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import static org.jboss.netty.handler.codec.http.HttpHeaders.*;
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import static org.jboss.netty.handler.codec.http.HttpMethod.*;
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import static org.jboss.netty.handler.codec.http.HttpResponseStatus.*;
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import static org.jboss.netty.handler.codec.http.HttpVersion.*;
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/**
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* Handles handshakes and messages
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*/
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public class AutobahnServerHandler extends SimpleChannelUpstreamHandler {
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(AutobahnServerHandler.class);
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private WebSocketServerHandshaker handshaker;
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@Override
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public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
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Object msg = e.getMessage();
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if (msg instanceof HttpRequest) {
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handleHttpRequest(ctx, (HttpRequest) msg);
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} else if (msg instanceof WebSocketFrame) {
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handleWebSocketFrame(ctx, (WebSocketFrame) msg);
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}
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}
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private void handleHttpRequest(ChannelHandlerContext ctx, HttpRequest req) {
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// Allow only GET methods.
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if (req.getMethod() != GET) {
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sendHttpResponse(ctx, req, new DefaultHttpResponse(HTTP_1_1, FORBIDDEN));
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return;
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}
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// Handshake
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WebSocketServerHandshakerFactory wsFactory =
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new WebSocketServerHandshakerFactory(getWebSocketLocation(req), null, false);
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handshaker = wsFactory.newHandshaker(req);
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if (handshaker == null) {
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wsFactory.sendUnsupportedWebSocketVersionResponse(ctx.getChannel());
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} else {
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handshaker.handshake(ctx.getChannel(), req).addListener(WebSocketServerHandshaker.HANDSHAKE_LISTENER);
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}
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}
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private void handleWebSocketFrame(ChannelHandlerContext ctx, WebSocketFrame frame) {
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if (logger.isDebugEnabled()) {
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logger.debug(String.format(
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"Channel %s received %s", ctx.getChannel().getId(), frame.getClass().getSimpleName()));
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}
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if (frame instanceof CloseWebSocketFrame) {
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handshaker.close(ctx.getChannel(), (CloseWebSocketFrame) frame);
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} else if (frame instanceof PingWebSocketFrame) {
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ctx.getChannel().write(
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new PongWebSocketFrame(frame.isFinalFragment(), frame.getRsv(), frame.getBinaryData()));
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} else if (frame instanceof TextWebSocketFrame) {
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// String text = ((TextWebSocketFrame) frame).getText();
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ctx.getChannel().write(
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new TextWebSocketFrame(frame.isFinalFragment(), frame.getRsv(), frame.getBinaryData()));
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} else if (frame instanceof BinaryWebSocketFrame) {
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ctx.getChannel().write(
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new BinaryWebSocketFrame(frame.isFinalFragment(), frame.getRsv(), frame.getBinaryData()));
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} else if (frame instanceof ContinuationWebSocketFrame) {
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ctx.getChannel().write(
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new ContinuationWebSocketFrame(frame.isFinalFragment(), frame.getRsv(), frame.getBinaryData()));
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} else if (frame instanceof PongWebSocketFrame) {
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// Ignore
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} else {
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throw new UnsupportedOperationException(String.format("%s frame types not supported", frame.getClass()
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.getName()));
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}
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}
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private static void sendHttpResponse(ChannelHandlerContext ctx, HttpRequest req, HttpResponse res) {
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// Generate an error page if response status code is not OK (200).
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if (res.getStatus().getCode() != 200) {
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res.setContent(ChannelBuffers.copiedBuffer(res.getStatus().toString(), CharsetUtil.UTF_8));
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setContentLength(res, res.getContent().readableBytes());
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}
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// Send the response and close the connection if necessary.
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ChannelFuture f = ctx.getChannel().write(res);
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if (!isKeepAlive(req) || res.getStatus().getCode() != 200) {
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f.addListener(ChannelFutureListener.CLOSE);
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
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e.getCause().printStackTrace();
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e.getChannel().close();
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}
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private static String getWebSocketLocation(HttpRequest req) {
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return "ws://" + req.headers().get(HttpHeaders.Names.HOST);
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}
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}
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