Also refactor the handshakers to share more code and make it easier to implement a new one and less error-prone
245 lines
8.8 KiB
Java
245 lines
8.8 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.handler.codec.http;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.MessageBuf;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelInboundByteHandler;
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import io.netty.channel.ChannelOutboundMessageHandler;
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import io.netty.channel.CombinedChannelDuplexHandler;
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import io.netty.handler.codec.PrematureChannelClosureException;
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import java.util.ArrayDeque;
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import java.util.Queue;
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import java.util.concurrent.atomic.AtomicLong;
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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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*
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* If the {@link Channel} is closed and there are missing responses,
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* a {@link PrematureChannelClosureException} is thrown.
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*
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* @see HttpServerCodec
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*/
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public final class HttpClientCodec
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extends CombinedChannelDuplexHandler
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implements ChannelInboundByteHandler, ChannelOutboundMessageHandler<HttpObject> {
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/** A queue that is used for correlating a request and a response. */
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private final Queue<HttpMethod> queue = new ArrayDeque<HttpMethod>();
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/** If true, decoding stops (i.e. pass-through) */
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private volatile boolean done;
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private final AtomicLong requestResponseCounter = new AtomicLong();
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private final boolean failOnMissingResponse;
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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, false);
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}
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public void setSingleDecode(boolean singleDecode) {
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decoder().setSingleDecode(singleDecode);
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}
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public boolean isSingleDecode() {
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return decoder().isSingleDecode();
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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(int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
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this(maxInitialLineLength, maxHeaderSize, maxChunkSize, false);
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}
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public HttpClientCodec(
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int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean failOnMissingResponse) {
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init(new Decoder(maxInitialLineLength, maxHeaderSize, maxChunkSize), new Encoder());
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this.failOnMissingResponse = failOnMissingResponse;
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}
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private Decoder decoder() {
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return (Decoder) stateHandler();
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}
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private Encoder encoder() {
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return (Encoder) operationHandler();
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}
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@Override
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public ByteBuf newInboundBuffer(ChannelHandlerContext ctx) throws Exception {
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return decoder().newInboundBuffer(ctx);
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}
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@Override
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public void discardInboundReadBytes(ChannelHandlerContext ctx) throws Exception {
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decoder().discardInboundReadBytes(ctx);
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}
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@Override
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public void freeInboundBuffer(ChannelHandlerContext ctx) throws Exception {
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decoder().freeInboundBuffer(ctx);
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}
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@Override
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public MessageBuf<HttpObject> newOutboundBuffer(ChannelHandlerContext ctx) throws Exception {
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return encoder().newOutboundBuffer(ctx);
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}
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@Override
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public void freeOutboundBuffer(ChannelHandlerContext ctx) throws Exception {
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encoder().freeOutboundBuffer(ctx);
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}
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private final class Encoder extends HttpRequestEncoder {
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@Override
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protected void encode(
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ChannelHandlerContext ctx, HttpObject msg, ByteBuf out) 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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super.encode(ctx, msg, out);
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if (failOnMissingResponse) {
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// check if the request is chunked if so do not increment
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if (msg instanceof LastHttpContent) {
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// increment as its the last chunk
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requestResponseCounter.incrementAndGet();
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}
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}
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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(
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ChannelHandlerContext ctx, ByteBuf buffer) 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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Object msg = super.decode(ctx, buffer);
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if (failOnMissingResponse) {
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decrement(msg);
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}
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return msg;
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}
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}
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private void decrement(Object msg) {
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if (msg == null) {
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return;
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}
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// check if it's an Header and its transfer encoding is not chunked.
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if (msg instanceof LastHttpContent) {
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requestResponseCounter.decrementAndGet();
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} else if (msg instanceof Object[]) {
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Object[] objects = (Object[]) msg;
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for (Object obj: objects) {
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decrement(obj);
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}
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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().code();
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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 getMethod 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.name().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 getMethod 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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@Override
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public void channelInactive(ChannelHandlerContext ctx)
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throws Exception {
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super.channelInactive(ctx);
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if (failOnMissingResponse) {
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long missingResponses = requestResponseCounter.get();
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if (missingResponses > 0) {
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ctx.fireExceptionCaught(new PrematureChannelClosureException(
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"channel gone inactive with " + missingResponses +
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" missing response(s)"));
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}
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}
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}
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}
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}
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