223efc5f99
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: - applet - websocket/html5 - websocketx/sslserver - localecho/multithreaded - Add run-example.sh which simplifies launching an example from command line - Rewrite FileServer example 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.
160 lines
6.2 KiB
Java
160 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 io.netty.example.http.websocketx.server;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.handler.codec.http.DefaultFullHttpResponse;
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import io.netty.handler.codec.http.FullHttpRequest;
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import io.netty.handler.codec.http.FullHttpResponse;
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import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.PongWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
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import io.netty.handler.codec.http.websocketx.WebSocketFrame;
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import io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker;
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import io.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory;
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import io.netty.util.CharsetUtil;
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import static io.netty.handler.codec.http.HttpHeaders.Names.*;
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import static io.netty.handler.codec.http.HttpHeaders.*;
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import static io.netty.handler.codec.http.HttpMethod.*;
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import static io.netty.handler.codec.http.HttpResponseStatus.*;
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import static io.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 WebSocketServerHandler extends SimpleChannelInboundHandler<Object> {
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private static final String WEBSOCKET_PATH = "/websocket";
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private WebSocketServerHandshaker handshaker;
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@Override
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public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
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if (msg instanceof FullHttpRequest) {
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handleHttpRequest(ctx, (FullHttpRequest) 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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@Override
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public void channelReadComplete(ChannelHandlerContext ctx) {
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ctx.flush();
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}
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private void handleHttpRequest(ChannelHandlerContext ctx, FullHttpRequest req) {
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// Handle a bad request.
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if (!req.getDecoderResult().isSuccess()) {
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sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, BAD_REQUEST));
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return;
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}
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// Allow only GET methods.
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if (req.getMethod() != GET) {
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sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, FORBIDDEN));
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return;
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}
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// Send the demo page and favicon.ico
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if ("/".equals(req.getUri())) {
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ByteBuf content = WebSocketServerIndexPage.getContent(getWebSocketLocation(req));
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FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, OK, content);
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res.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");
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setContentLength(res, content.readableBytes());
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sendHttpResponse(ctx, req, res);
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return;
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}
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if ("/favicon.ico".equals(req.getUri())) {
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FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, NOT_FOUND);
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sendHttpResponse(ctx, req, res);
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return;
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}
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// Handshake
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WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(
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getWebSocketLocation(req), null, false);
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handshaker = wsFactory.newHandshaker(req);
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if (handshaker == null) {
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WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(ctx.channel());
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} else {
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handshaker.handshake(ctx.channel(), req);
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}
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}
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private void handleWebSocketFrame(ChannelHandlerContext ctx, WebSocketFrame frame) {
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// Check for closing frame
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if (frame instanceof CloseWebSocketFrame) {
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handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame.retain());
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return;
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}
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if (frame instanceof PingWebSocketFrame) {
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ctx.channel().write(new PongWebSocketFrame(frame.content().retain()));
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return;
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}
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if (!(frame instanceof TextWebSocketFrame)) {
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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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// Send the uppercase string back.
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String request = ((TextWebSocketFrame) frame).text();
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System.err.printf("%s received %s%n", ctx.channel(), request);
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ctx.channel().write(new TextWebSocketFrame(request.toUpperCase()));
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}
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private static void sendHttpResponse(
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ChannelHandlerContext ctx, FullHttpRequest req, FullHttpResponse res) {
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// Generate an error page if response getStatus code is not OK (200).
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if (res.getStatus().code() != 200) {
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ByteBuf buf = Unpooled.copiedBuffer(res.getStatus().toString(), CharsetUtil.UTF_8);
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res.content().writeBytes(buf);
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buf.release();
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setContentLength(res, res.content().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.channel().writeAndFlush(res);
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if (!isKeepAlive(req) || res.getStatus().code() != 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, Throwable cause) {
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cause.printStackTrace();
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ctx.close();
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}
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private static String getWebSocketLocation(FullHttpRequest req) {
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String location = req.headers().get(HOST) + WEBSOCKET_PATH;
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if (WebSocketServer.SSL) {
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return "wss://" + location;
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} else {
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return "ws://" + location;
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}
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}
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}
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