8663716d38
Split the project into the following modules: * common * buffer * codec * codec-http * transport * transport-* * handler * example * testsuite (integration tests that involve 2+ modules) * all (does nothing yet, but will make it generate netty.jar) This commit also fixes the compilation errors with transport-sctp on non-Linux systems. It will at least compile without complaints.
166 lines
6.1 KiB
Java
166 lines
6.1 KiB
Java
/*
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* Copyright 2011 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.handler.codec.http;
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import java.util.Queue;
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import io.netty.buffer.ChannelBuffer;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelDownstreamHandler;
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import io.netty.channel.ChannelEvent;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelUpstreamHandler;
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import io.netty.util.internal.QueueFactory;
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/**
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* A combination of {@link HttpRequestEncoder} and {@link HttpResponseDecoder}
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* which enables easier client side HTTP implementation. {@link HttpClientCodec}
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* provides additional state management for <tt>HEAD</tt> and <tt>CONNECT</tt>
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* requests, which {@link HttpResponseDecoder} lacks. Please refer to
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* {@link HttpResponseDecoder} to learn what additional state management needs
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* to be done for <tt>HEAD</tt> and <tt>CONNECT</tt> and why
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* {@link HttpResponseDecoder} can not handle it by itself.
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* @see HttpServerCodec
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*
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* @apiviz.has io.netty.handler.codec.http.HttpResponseDecoder
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* @apiviz.has io.netty.handler.codec.http.HttpRequestEncoder
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*/
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public class HttpClientCodec implements ChannelUpstreamHandler,
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ChannelDownstreamHandler {
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/** A queue that is used for correlating a request and a response. */
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final Queue<HttpMethod> queue = QueueFactory.createQueue(HttpMethod.class);
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/** If true, decoding stops (i.e. pass-through) */
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volatile boolean done;
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private final HttpRequestEncoder encoder = new Encoder();
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private final HttpResponseDecoder decoder;
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/**
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* Creates a new instance with the default decoder options
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* ({@code maxInitialLineLength (4096}}, {@code maxHeaderSize (8192)}, and
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* {@code maxChunkSize (8192)}).
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*/
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public HttpClientCodec() {
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this(4096, 8192, 8192);
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}
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/**
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* Creates a new instance with the specified decoder options.
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*/
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public HttpClientCodec(
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int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
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decoder = new Decoder(maxInitialLineLength, maxHeaderSize, maxChunkSize);
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}
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@Override
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public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e)
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throws Exception {
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decoder.handleUpstream(ctx, e);
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}
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@Override
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public void handleDownstream(ChannelHandlerContext ctx, ChannelEvent e)
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throws Exception {
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encoder.handleDownstream(ctx, e);
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}
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private final class Encoder extends HttpRequestEncoder {
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Encoder() {
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}
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@Override
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protected Object encode(ChannelHandlerContext ctx, Channel channel,
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Object msg) throws Exception {
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if (msg instanceof HttpRequest && !done) {
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queue.offer(((HttpRequest) msg).getMethod());
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}
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return super.encode(ctx, channel, msg);
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}
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}
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private final class Decoder extends HttpResponseDecoder {
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Decoder(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
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super(maxInitialLineLength, maxHeaderSize, maxChunkSize);
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}
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@Override
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protected Object decode(ChannelHandlerContext ctx, Channel channel,
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ChannelBuffer buffer, State state) throws Exception {
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if (done) {
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return buffer.readBytes(actualReadableBytes());
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} else {
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return super.decode(ctx, channel, buffer, state);
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}
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}
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@Override
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protected boolean isContentAlwaysEmpty(HttpMessage msg) {
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final int statusCode = ((HttpResponse) msg).getStatus().getCode();
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if (statusCode == 100) {
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// 100-continue response should be excluded from paired comparison.
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return true;
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}
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// Get the method of the HTTP request that corresponds to the
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// current response.
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HttpMethod method = queue.poll();
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char firstChar = method.getName().charAt(0);
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switch (firstChar) {
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case 'H':
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// According to 4.3, RFC2616:
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// All responses to the HEAD request method MUST NOT include a
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// message-body, even though the presence of entity-header fields
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// might lead one to believe they do.
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if (HttpMethod.HEAD.equals(method)) {
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return true;
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// The following code was inserted to work around the servers
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// that behave incorrectly. It has been commented out
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// because it does not work with well behaving servers.
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// Please note, even if the 'Transfer-Encoding: chunked'
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// header exists in the HEAD response, the response should
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// have absolutely no content.
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//
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//// Interesting edge case:
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//// Some poorly implemented servers will send a zero-byte
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//// chunk if Transfer-Encoding of the response is 'chunked'.
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////
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//// return !msg.isChunked();
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}
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break;
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case 'C':
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// Successful CONNECT request results in a response with empty body.
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if (statusCode == 200) {
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if (HttpMethod.CONNECT.equals(method)) {
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// Proxy connection established - Not HTTP anymore.
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done = true;
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queue.clear();
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return true;
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}
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}
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break;
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}
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return super.isContentAlwaysEmpty(msg);
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}
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}
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}
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