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.
197 lines
7.7 KiB
Java
197 lines
7.7 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.snoop;
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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.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.DecoderResult;
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import io.netty.handler.codec.http.Cookie;
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import io.netty.handler.codec.http.CookieDecoder;
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import io.netty.handler.codec.http.DefaultFullHttpResponse;
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import io.netty.handler.codec.http.FullHttpResponse;
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import io.netty.handler.codec.http.HttpContent;
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import io.netty.handler.codec.http.HttpHeaders;
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import io.netty.handler.codec.http.HttpObject;
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import io.netty.handler.codec.http.HttpRequest;
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import io.netty.handler.codec.http.LastHttpContent;
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import io.netty.handler.codec.http.QueryStringDecoder;
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import io.netty.handler.codec.http.ServerCookieEncoder;
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import io.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 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.HttpResponseStatus.*;
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import static io.netty.handler.codec.http.HttpVersion.*;
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public class HttpSnoopServerHandler extends SimpleChannelInboundHandler<Object> {
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private HttpRequest request;
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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 channelReadComplete(ChannelHandlerContext ctx) {
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ctx.flush();
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}
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@Override
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protected void channelRead0(ChannelHandlerContext ctx, Object msg) {
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if (msg instanceof HttpRequest) {
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HttpRequest request = this.request = (HttpRequest) msg;
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if (is100ContinueExpected(request)) {
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send100Continue(ctx);
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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: ").append(request.getProtocolVersion()).append("\r\n");
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buf.append("HOSTNAME: ").append(getHost(request, "unknown")).append("\r\n");
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buf.append("REQUEST_URI: ").append(request.getUri()).append("\r\n\r\n");
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HttpHeaders headers = request.headers();
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if (!headers.isEmpty()) {
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for (Map.Entry<String, String> h: headers) {
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String key = h.getKey();
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String value = h.getValue();
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buf.append("HEADER: ").append(key).append(" = ").append(value).append("\r\n");
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}
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buf.append("\r\n");
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}
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QueryStringDecoder queryStringDecoder = new QueryStringDecoder(request.getUri());
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Map<String, List<String>> params = queryStringDecoder.parameters();
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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: ").append(key).append(" = ").append(val).append("\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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appendDecoderResult(buf, request);
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}
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if (msg instanceof HttpContent) {
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HttpContent httpContent = (HttpContent) msg;
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ByteBuf content = httpContent.content();
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if (content.isReadable()) {
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buf.append("CONTENT: ");
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buf.append(content.toString(CharsetUtil.UTF_8));
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buf.append("\r\n");
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appendDecoderResult(buf, request);
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}
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if (msg instanceof LastHttpContent) {
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buf.append("END OF CONTENT\r\n");
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LastHttpContent trailer = (LastHttpContent) msg;
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if (!trailer.trailingHeaders().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: ");
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buf.append(name).append(" = ").append(value).append("\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 (!writeResponse(trailer, ctx)) {
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// If keep-alive is off, close the connection once the content is fully written.
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ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
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}
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}
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}
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}
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private static void appendDecoderResult(StringBuilder buf, HttpObject o) {
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DecoderResult result = o.getDecoderResult();
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if (result.isSuccess()) {
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return;
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}
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buf.append(".. WITH DECODER FAILURE: ");
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buf.append(result.cause());
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buf.append("\r\n");
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}
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private boolean writeResponse(HttpObject currentObj, ChannelHandlerContext ctx) {
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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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FullHttpResponse response = new DefaultFullHttpResponse(
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HTTP_1_1, currentObj.getDecoderResult().isSuccess()? OK : BAD_REQUEST,
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Unpooled.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.content().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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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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for (Cookie cookie: cookies) {
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response.headers().add(SET_COOKIE, ServerCookieEncoder.encode(cookie));
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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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response.headers().add(SET_COOKIE, ServerCookieEncoder.encode("key1", "value1"));
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response.headers().add(SET_COOKIE, ServerCookieEncoder.encode("key2", "value2"));
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}
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// Write the response.
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ctx.write(response);
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return keepAlive;
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}
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private static void send100Continue(ChannelHandlerContext ctx) {
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FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, CONTINUE);
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ctx.write(response);
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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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}
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