Motivation: Other implementations of FullHttpMessage allow .toString to be called after the Message has been released This brings AggregatedFullHttpMessage into line with those impls. Modifications: - Changed AggregatedFullHttpMessage to no longer be a sub-class of DefaultByteBufHolder - Changes AggregatedFullHttpMessage to implement ByteBufHolder - Hold the content buffer internally to AggregatedFullHttpMessage - Implement the required content() and release() methods that were missing - Do not check refcnt when accessing content() (similar to DefaultFullHttpMessage) Result: A released AggregatedFullHttpMessage can have .toString called without throwing an exception
524 lines
17 KiB
Java
524 lines
17 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.ByteBufHolder;
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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.ChannelHandler;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelPipeline;
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import io.netty.handler.codec.DecoderResult;
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import io.netty.handler.codec.MessageAggregator;
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import io.netty.handler.codec.TooLongFrameException;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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/**
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* A {@link ChannelHandler} that aggregates an {@link HttpMessage}
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* and its following {@link HttpContent}s into a single {@link FullHttpRequest}
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* or {@link FullHttpResponse} (depending on if it used to handle requests or responses)
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* with no following {@link HttpContent}s. It is useful when you don't want to take
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* care of HTTP messages whose transfer encoding is 'chunked'. Insert this
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* handler after {@link HttpObjectDecoder} in the {@link ChannelPipeline}:
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* <pre>
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* {@link ChannelPipeline} p = ...;
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* ...
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* p.addLast("encoder", new {@link HttpResponseEncoder}());
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* p.addLast("decoder", new {@link HttpRequestDecoder}());
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* p.addLast("aggregator", <b>new {@link HttpObjectAggregator}(1048576)</b>);
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* ...
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* p.addLast("handler", new HttpRequestHandler());
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* </pre>
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* Be aware that you need to have the {@link HttpResponseEncoder} or {@link HttpRequestEncoder}
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* before the {@link HttpObjectAggregator} in the {@link ChannelPipeline}.
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*/
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public class HttpObjectAggregator
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extends MessageAggregator<HttpObject, HttpMessage, HttpContent, FullHttpMessage> {
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(HttpObjectAggregator.class);
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private static final FullHttpResponse CONTINUE = new DefaultFullHttpResponse(
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HttpVersion.HTTP_1_1, HttpResponseStatus.CONTINUE, Unpooled.EMPTY_BUFFER);
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private static final FullHttpResponse TOO_LARGE = new DefaultFullHttpResponse(
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HttpVersion.HTTP_1_1, HttpResponseStatus.REQUEST_ENTITY_TOO_LARGE, Unpooled.EMPTY_BUFFER);
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static {
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TOO_LARGE.headers().set(HttpHeaderNames.CONTENT_LENGTH, 0);
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}
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/**
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* Creates a new instance.
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*
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* @param maxContentLength
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* the maximum length of the aggregated content in bytes.
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* If the length of the aggregated content exceeds this value,
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* {@link #handleOversizedMessage(ChannelHandlerContext, HttpMessage)}
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* will be called.
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*/
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public HttpObjectAggregator(int maxContentLength) {
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super(maxContentLength);
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}
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@Override
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protected boolean isStartMessage(HttpObject msg) throws Exception {
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return msg instanceof HttpMessage;
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}
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@Override
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protected boolean isContentMessage(HttpObject msg) throws Exception {
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return msg instanceof HttpContent;
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}
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@Override
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protected boolean isLastContentMessage(HttpContent msg) throws Exception {
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return msg instanceof LastHttpContent;
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}
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@Override
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protected boolean isAggregated(HttpObject msg) throws Exception {
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return msg instanceof FullHttpMessage;
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}
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@Override
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protected boolean hasContentLength(HttpMessage start) throws Exception {
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return HttpHeaderUtil.isContentLengthSet(start);
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}
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@Override
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protected long contentLength(HttpMessage start) throws Exception {
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return HttpHeaderUtil.getContentLength(start);
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}
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@Override
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protected Object newContinueResponse(HttpMessage start) throws Exception {
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if (HttpHeaderUtil.is100ContinueExpected(start)) {
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return CONTINUE;
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} else {
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return null;
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}
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}
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@Override
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protected FullHttpMessage beginAggregation(HttpMessage start, ByteBuf content) throws Exception {
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assert !(start instanceof FullHttpMessage);
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HttpHeaderUtil.setTransferEncodingChunked(start, false);
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AggregatedFullHttpMessage ret;
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if (start instanceof HttpRequest) {
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ret = new AggregatedFullHttpRequest((HttpRequest) start, content, null);
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} else if (start instanceof HttpResponse) {
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ret = new AggregatedFullHttpResponse((HttpResponse) start, content, null);
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} else {
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throw new Error();
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}
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return ret;
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}
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@Override
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protected void aggregate(FullHttpMessage aggregated, HttpContent content) throws Exception {
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if (content instanceof LastHttpContent) {
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// Merge trailing headers into the message.
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((AggregatedFullHttpMessage) aggregated).setTrailingHeaders(((LastHttpContent) content).trailingHeaders());
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}
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}
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@Override
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protected void finishAggregation(FullHttpMessage aggregated) throws Exception {
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// Set the 'Content-Length' header. If one isn't already set.
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// This is important as HEAD responses will use a 'Content-Length' header which
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// does not match the actual body, but the number of bytes that would be
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// transmitted if a GET would have been used.
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//
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// See rfc2616 14.13 Content-Length
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if (!HttpHeaderUtil.isContentLengthSet(aggregated)) {
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aggregated.headers().set(
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HttpHeaderNames.CONTENT_LENGTH,
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String.valueOf(aggregated.content().readableBytes()));
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}
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}
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@Override
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protected void handleOversizedMessage(final ChannelHandlerContext ctx, HttpMessage oversized) throws Exception {
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if (oversized instanceof HttpRequest) {
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// send back a 413 and close the connection
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ChannelFuture future = ctx.writeAndFlush(TOO_LARGE).addListener(new ChannelFutureListener() {
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@Override
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public void operationComplete(ChannelFuture future) throws Exception {
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if (!future.isSuccess()) {
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logger.debug("Failed to send a 413 Request Entity Too Large.", future.cause());
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ctx.close();
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}
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}
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});
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// If the client started to send data already, close because it's impossible to recover.
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// If keep-alive is off and 'Expect: 100-continue' is missing, no need to leave the connection open.
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if (oversized instanceof FullHttpMessage ||
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!HttpHeaderUtil.is100ContinueExpected(oversized) && !HttpHeaderUtil.isKeepAlive(oversized)) {
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future.addListener(ChannelFutureListener.CLOSE);
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}
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// If an oversized request was handled properly and the connection is still alive
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// (i.e. rejected 100-continue). the decoder should prepare to handle a new message.
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HttpObjectDecoder decoder = ctx.pipeline().get(HttpObjectDecoder.class);
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if (decoder != null) {
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decoder.reset();
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}
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} else if (oversized instanceof HttpResponse) {
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ctx.close();
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throw new TooLongFrameException("Response entity too large: " + oversized);
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} else {
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throw new IllegalStateException();
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}
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}
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private abstract static class AggregatedFullHttpMessage implements ByteBufHolder, FullHttpMessage {
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protected final HttpMessage message;
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private final ByteBuf content;
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private HttpHeaders trailingHeaders;
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AggregatedFullHttpMessage(HttpMessage message, ByteBuf content, HttpHeaders trailingHeaders) {
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this.message = message;
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this.content = content;
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this.trailingHeaders = trailingHeaders;
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}
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@Override
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public HttpHeaders trailingHeaders() {
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HttpHeaders trailingHeaders = this.trailingHeaders;
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if (trailingHeaders == null) {
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return HttpHeaders.EMPTY_HEADERS;
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} else {
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return trailingHeaders;
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}
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}
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void setTrailingHeaders(HttpHeaders trailingHeaders) {
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this.trailingHeaders = trailingHeaders;
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}
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@Override
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public HttpVersion getProtocolVersion() {
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return message.protocolVersion();
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}
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@Override
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public HttpVersion protocolVersion() {
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return message.protocolVersion();
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}
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@Override
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public FullHttpMessage setProtocolVersion(HttpVersion version) {
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message.setProtocolVersion(version);
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return this;
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}
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@Override
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public HttpHeaders headers() {
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return message.headers();
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}
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@Override
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public DecoderResult decoderResult() {
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return message.decoderResult();
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}
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@Override
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public DecoderResult getDecoderResult() {
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return message.decoderResult();
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}
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@Override
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public void setDecoderResult(DecoderResult result) {
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message.setDecoderResult(result);
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}
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@Override
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public ByteBuf content() {
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return content;
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}
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@Override
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public int refCnt() {
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return content.refCnt();
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}
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@Override
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public FullHttpMessage retain() {
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content.retain();
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return this;
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}
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@Override
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public FullHttpMessage retain(int increment) {
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content.retain(increment);
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return this;
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}
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@Override
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public FullHttpMessage touch(Object hint) {
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content.touch(hint);
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return this;
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}
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@Override
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public FullHttpMessage touch() {
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content.touch();
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return this;
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}
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@Override
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public boolean release() {
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return content.release();
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}
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@Override
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public boolean release(int decrement) {
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return content.release(decrement);
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}
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@Override
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public abstract FullHttpMessage copy();
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@Override
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public abstract FullHttpMessage duplicate();
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}
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private static final class AggregatedFullHttpRequest extends AggregatedFullHttpMessage implements FullHttpRequest {
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AggregatedFullHttpRequest(HttpRequest request, ByteBuf content, HttpHeaders trailingHeaders) {
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super(request, content, trailingHeaders);
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}
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/**
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* Copy this object
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*
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* @param copyContent
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* <ul>
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* <li>{@code true} if this object's {@link #content()} should be used to copy.</li>
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* <li>{@code false} if {@code newContent} should be used instead.</li>
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* </ul>
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* @param newContent
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* <ul>
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* <li>if {@code copyContent} is false then this will be used in the copy's content.</li>
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* <li>if {@code null} then a default buffer of 0 size will be selected</li>
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* </ul>
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* @return A copy of this object
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*/
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private FullHttpRequest copy(boolean copyContent, ByteBuf newContent) {
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DefaultFullHttpRequest copy = new DefaultFullHttpRequest(
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protocolVersion(), method(), uri(),
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copyContent ? content().copy() :
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newContent == null ? Unpooled.buffer(0) : newContent);
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copy.headers().set(headers());
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copy.trailingHeaders().set(trailingHeaders());
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return copy;
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}
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@Override
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public FullHttpRequest copy(ByteBuf newContent) {
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return copy(false, newContent);
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}
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@Override
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public FullHttpRequest copy() {
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return copy(true, null);
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}
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@Override
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public FullHttpRequest duplicate() {
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DefaultFullHttpRequest duplicate = new DefaultFullHttpRequest(
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getProtocolVersion(), getMethod(), getUri(), content().duplicate());
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duplicate.headers().set(headers());
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duplicate.trailingHeaders().set(trailingHeaders());
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return duplicate;
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}
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@Override
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public FullHttpRequest retain(int increment) {
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super.retain(increment);
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return this;
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}
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@Override
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public FullHttpRequest retain() {
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super.retain();
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return this;
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}
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@Override
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public FullHttpRequest touch() {
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super.touch();
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return this;
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}
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@Override
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public FullHttpRequest touch(Object hint) {
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super.touch(hint);
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return this;
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}
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@Override
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public FullHttpRequest setMethod(HttpMethod method) {
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((HttpRequest) message).setMethod(method);
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return this;
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}
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@Override
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public FullHttpRequest setUri(String uri) {
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((HttpRequest) message).setUri(uri);
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return this;
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}
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@Override
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public HttpMethod getMethod() {
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return ((HttpRequest) message).method();
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}
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@Override
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public String getUri() {
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return ((HttpRequest) message).uri();
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}
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@Override
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public HttpMethod method() {
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return getMethod();
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}
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@Override
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public String uri() {
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return getUri();
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}
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@Override
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public FullHttpRequest setProtocolVersion(HttpVersion version) {
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super.setProtocolVersion(version);
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return this;
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}
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@Override
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public String toString() {
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return HttpMessageUtil.appendFullRequest(new StringBuilder(256), this).toString();
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}
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}
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private static final class AggregatedFullHttpResponse extends AggregatedFullHttpMessage
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implements FullHttpResponse {
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AggregatedFullHttpResponse(HttpResponse message, ByteBuf content, HttpHeaders trailingHeaders) {
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super(message, content, trailingHeaders);
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}
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/**
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* Copy this object
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*
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* @param copyContent
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* <ul>
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* <li>{@code true} if this object's {@link #content()} should be used to copy.</li>
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* <li>{@code false} if {@code newContent} should be used instead.</li>
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* </ul>
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* @param newContent
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* <ul>
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* <li>if {@code copyContent} is false then this will be used in the copy's content.</li>
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* <li>if {@code null} then a default buffer of 0 size will be selected</li>
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* </ul>
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* @return A copy of this object
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*/
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private FullHttpResponse copy(boolean copyContent, ByteBuf newContent) {
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DefaultFullHttpResponse copy = new DefaultFullHttpResponse(
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protocolVersion(), status(),
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copyContent ? content().copy() :
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newContent == null ? Unpooled.buffer(0) : newContent);
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copy.headers().set(headers());
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copy.trailingHeaders().set(trailingHeaders());
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return copy;
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}
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@Override
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public FullHttpResponse copy(ByteBuf newContent) {
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return copy(false, newContent);
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}
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@Override
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public FullHttpResponse copy() {
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return copy(true, null);
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}
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@Override
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public FullHttpResponse duplicate() {
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DefaultFullHttpResponse duplicate = new DefaultFullHttpResponse(getProtocolVersion(), getStatus(),
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content().duplicate());
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duplicate.headers().set(headers());
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duplicate.trailingHeaders().set(trailingHeaders());
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return duplicate;
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}
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@Override
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public FullHttpResponse setStatus(HttpResponseStatus status) {
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((HttpResponse) message).setStatus(status);
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return this;
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}
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@Override
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public HttpResponseStatus getStatus() {
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return ((HttpResponse) message).status();
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}
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@Override
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public HttpResponseStatus status() {
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return getStatus();
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}
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@Override
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public FullHttpResponse setProtocolVersion(HttpVersion version) {
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super.setProtocolVersion(version);
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return this;
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}
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@Override
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public FullHttpResponse retain(int increment) {
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super.retain(increment);
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return this;
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}
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@Override
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public FullHttpResponse retain() {
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super.retain();
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return this;
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}
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@Override
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public FullHttpResponse touch(Object hint) {
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super.touch(hint);
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return this;
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}
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@Override
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public FullHttpResponse touch() {
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super.touch();
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return this;
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}
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@Override
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public String toString() {
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return HttpMessageUtil.appendFullResponse(new StringBuilder(256), this).toString();
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}
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}
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}
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