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.
182 lines
7.4 KiB
Java
182 lines
7.4 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.snoop;
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import org.jboss.netty.buffer.ChannelBuffer;
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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.Cookie;
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import org.jboss.netty.handler.codec.http.CookieDecoder;
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import org.jboss.netty.handler.codec.http.CookieEncoder;
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import org.jboss.netty.handler.codec.http.DefaultHttpResponse;
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import org.jboss.netty.handler.codec.http.HttpChunk;
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import org.jboss.netty.handler.codec.http.HttpChunkTrailer;
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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.QueryStringDecoder;
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import org.jboss.netty.util.CharsetUtil;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.Set;
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import static org.jboss.netty.handler.codec.http.HttpHeaders.Names.*;
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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.HttpResponseStatus.*;
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import static org.jboss.netty.handler.codec.http.HttpVersion.*;
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public class HttpSnoopServerHandler extends SimpleChannelUpstreamHandler {
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private HttpRequest request;
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private boolean readingChunks;
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/** Buffer that stores the response content */
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private final StringBuilder buf = new StringBuilder();
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@Override
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public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
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if (!readingChunks) {
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HttpRequest request = this.request = (HttpRequest) e.getMessage();
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if (is100ContinueExpected(request)) {
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send100Continue(e);
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}
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buf.setLength(0);
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buf.append("WELCOME TO THE WILD WILD WEB SERVER\r\n");
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buf.append("===================================\r\n");
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buf.append("VERSION: " + request.getProtocolVersion() + "\r\n");
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buf.append("HOSTNAME: " + getHost(request, "unknown") + "\r\n");
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buf.append("REQUEST_URI: " + request.getUri() + "\r\n\r\n");
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for (Map.Entry<String, String> h: request.headers()) {
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buf.append("HEADER: " + h.getKey() + " = " + h.getValue() + "\r\n");
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}
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buf.append("\r\n");
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QueryStringDecoder queryStringDecoder = new QueryStringDecoder(request.getUri());
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Map<String, List<String>> params = queryStringDecoder.getParameters();
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if (!params.isEmpty()) {
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for (Entry<String, List<String>> p: params.entrySet()) {
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String key = p.getKey();
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List<String> vals = p.getValue();
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for (String val : vals) {
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buf.append("PARAM: " + key + " = " + val + "\r\n");
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}
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}
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buf.append("\r\n");
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}
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if (request.isChunked()) {
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readingChunks = true;
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} else {
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ChannelBuffer content = request.getContent();
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if (content.readable()) {
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buf.append("CONTENT: " + content.toString(CharsetUtil.UTF_8) + "\r\n");
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}
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writeResponse(e);
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}
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} else {
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HttpChunk chunk = (HttpChunk) e.getMessage();
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if (chunk.isLast()) {
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readingChunks = false;
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buf.append("END OF CONTENT\r\n");
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HttpChunkTrailer trailer = (HttpChunkTrailer) chunk;
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if (!trailer.trailingHeaders().names().isEmpty()) {
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buf.append("\r\n");
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for (String name: trailer.trailingHeaders().names()) {
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for (String value: trailer.trailingHeaders().getAll(name)) {
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buf.append("TRAILING HEADER: " + name + " = " + value + "\r\n");
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}
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}
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buf.append("\r\n");
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}
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writeResponse(e);
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} else {
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buf.append("CHUNK: " + chunk.getContent().toString(CharsetUtil.UTF_8) + "\r\n");
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}
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}
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}
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private void writeResponse(MessageEvent e) {
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// Decide whether to close the connection or not.
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boolean keepAlive = isKeepAlive(request);
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// Build the response object.
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HttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
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response.setContent(ChannelBuffers.copiedBuffer(buf.toString(), CharsetUtil.UTF_8));
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response.headers().set(CONTENT_TYPE, "text/plain; charset=UTF-8");
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if (keepAlive) {
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// Add 'Content-Length' header only for a keep-alive connection.
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response.headers().set(CONTENT_LENGTH, response.getContent().readableBytes());
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// Add keep alive header as per:
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// - http://www.w3.org/Protocols/HTTP/1.1/draft-ietf-http-v11-spec-01.html#Connection
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response.headers().set(CONNECTION, HttpHeaders.Values.KEEP_ALIVE);
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}
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// Encode the cookie.
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String cookieString = request.headers().get(COOKIE);
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if (cookieString != null) {
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CookieDecoder cookieDecoder = new CookieDecoder();
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Set<Cookie> cookies = cookieDecoder.decode(cookieString);
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if (!cookies.isEmpty()) {
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// Reset the cookies if necessary.
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CookieEncoder cookieEncoder = new CookieEncoder(true);
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for (Cookie cookie : cookies) {
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cookieEncoder.addCookie(cookie);
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response.headers().add(SET_COOKIE, cookieEncoder.encode());
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}
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}
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} else {
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// Browser sent no cookie. Add some.
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CookieEncoder cookieEncoder = new CookieEncoder(true);
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cookieEncoder.addCookie("key1", "value1");
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response.headers().add(SET_COOKIE, cookieEncoder.encode());
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cookieEncoder.addCookie("key2", "value2");
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response.headers().add(SET_COOKIE, cookieEncoder.encode());
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}
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// Write the response.
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ChannelFuture future = e.getChannel().write(response);
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// Close the non-keep-alive connection after the write operation is done.
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if (!keepAlive) {
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future.addListener(ChannelFutureListener.CLOSE);
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}
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}
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private static void send100Continue(MessageEvent e) {
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HttpResponse response = new DefaultHttpResponse(HTTP_1_1, CONTINUE);
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e.getChannel().write(response);
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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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}
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