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The Async Http Client (AHC) classes.
/*
* Copyright (c) 2014 AsyncHttpClient Project. All rights reserved.
*
* This program is licensed to you under the Apache License Version 2.0,
* and you may not use this file except in compliance with the Apache License Version 2.0.
* You may obtain a copy of the Apache License Version 2.0 at
* http://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the Apache License Version 2.0 is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
*/
package org.asynchttpclient.netty.handler;
import io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.PrematureChannelClosureException;
import io.netty.handler.codec.http.HttpContent;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.util.ReferenceCountUtil;
import org.asynchttpclient.AsyncHttpClientConfig;
import org.asynchttpclient.HttpResponseBodyPart;
import org.asynchttpclient.exception.ChannelClosedException;
import org.asynchttpclient.netty.DiscardEvent;
import org.asynchttpclient.netty.NettyResponseFuture;
import org.asynchttpclient.netty.OnLastHttpContentCallback;
import org.asynchttpclient.netty.channel.ChannelManager;
import org.asynchttpclient.netty.channel.Channels;
import org.asynchttpclient.netty.future.StackTraceInspector;
import org.asynchttpclient.netty.handler.intercept.Interceptors;
import org.asynchttpclient.netty.request.NettyRequestSender;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.nio.channels.ClosedChannelException;
import static org.asynchttpclient.util.MiscUtils.getCause;
public abstract class AsyncHttpClientHandler extends ChannelInboundHandlerAdapter {
protected final Logger logger = LoggerFactory.getLogger(getClass());
protected final AsyncHttpClientConfig config;
protected final ChannelManager channelManager;
protected final NettyRequestSender requestSender;
final Interceptors interceptors;
final boolean hasIOExceptionFilters;
AsyncHttpClientHandler(AsyncHttpClientConfig config,
ChannelManager channelManager,
NettyRequestSender requestSender) {
this.config = config;
this.channelManager = channelManager;
this.requestSender = requestSender;
interceptors = new Interceptors(config, channelManager, requestSender);
hasIOExceptionFilters = !config.getIoExceptionFilters().isEmpty();
}
@Override
public void channelRead(final ChannelHandlerContext ctx, Object msg) throws Exception {
Channel channel = ctx.channel();
Object attribute = Channels.getAttribute(channel);
try {
if (attribute instanceof OnLastHttpContentCallback && msg instanceof LastHttpContent) {
((OnLastHttpContentCallback) attribute).call();
} else if (attribute instanceof NettyResponseFuture) {
NettyResponseFuture future = (NettyResponseFuture) attribute;
future.touch();
handleRead(channel, future, msg);
} else if (attribute instanceof StreamedResponsePublisher) {
StreamedResponsePublisher publisher = (StreamedResponsePublisher) attribute;
publisher.future().touch();
if (msg instanceof HttpContent) {
ByteBuf content = ((HttpContent) msg).content();
// Republish as a HttpResponseBodyPart
if (content.isReadable()) {
HttpResponseBodyPart part = config.getResponseBodyPartFactory().newResponseBodyPart(content, false);
ctx.fireChannelRead(part);
}
if (msg instanceof LastHttpContent) {
// Remove the handler from the pipeline, this will trigger
// it to finish
ctx.pipeline().remove(publisher);
// Trigger a read, just in case the last read complete
// triggered no new read
ctx.read();
// Send the last content on to the protocol, so that it can
// conclude the cleanup
handleRead(channel, publisher.future(), msg);
}
} else {
logger.info("Received unexpected message while expecting a chunk: " + msg);
ctx.pipeline().remove(publisher);
Channels.setDiscard(channel);
}
} else if (attribute != DiscardEvent.DISCARD) {
// unhandled message
logger.debug("Orphan channel {} with attribute {} received message {}, closing", channel, attribute, msg);
Channels.silentlyCloseChannel(channel);
}
} finally {
ReferenceCountUtil.release(msg);
}
}
public void channelInactive(ChannelHandlerContext ctx) throws Exception {
if (requestSender.isClosed())
return;
Channel channel = ctx.channel();
channelManager.removeAll(channel);
Object attribute = Channels.getAttribute(channel);
logger.debug("Channel Closed: {} with attribute {}", channel, attribute);
if (attribute instanceof StreamedResponsePublisher) {
// setting `attribute` to be the underlying future so that the retry
// logic can kick-in
attribute = ((StreamedResponsePublisher) attribute).future();
}
if (attribute instanceof OnLastHttpContentCallback) {
OnLastHttpContentCallback callback = (OnLastHttpContentCallback) attribute;
Channels.setAttribute(channel, callback.future());
callback.call();
} else if (attribute instanceof NettyResponseFuture) {
NettyResponseFuture future = (NettyResponseFuture) attribute;
future.touch();
if (hasIOExceptionFilters && requestSender.applyIoExceptionFiltersAndReplayRequest(future, ChannelClosedException.INSTANCE, channel))
return;
handleChannelInactive(future);
requestSender.handleUnexpectedClosedChannel(channel, future);
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable e) {
Throwable cause = getCause(e);
if (cause instanceof PrematureChannelClosureException || cause instanceof ClosedChannelException)
return;
Channel channel = ctx.channel();
NettyResponseFuture future = null;
logger.debug("Unexpected I/O exception on channel {}", channel, cause);
try {
Object attribute = Channels.getAttribute(channel);
if (attribute instanceof StreamedResponsePublisher) {
ctx.fireExceptionCaught(e);
// setting `attribute` to be the underlying future so that the
// retry logic can kick-in
attribute = ((StreamedResponsePublisher) attribute).future();
}
if (attribute instanceof NettyResponseFuture) {
future = (NettyResponseFuture) attribute;
future.attachChannel(null, false);
future.touch();
if (cause instanceof IOException) {
// FIXME why drop the original exception and throw a new one?
if (hasIOExceptionFilters) {
if (!requestSender.applyIoExceptionFiltersAndReplayRequest(future, ChannelClosedException.INSTANCE, channel)) {
// Close the channel so the recovering can occurs.
Channels.silentlyCloseChannel(channel);
}
return;
}
}
if (StackTraceInspector.recoverOnReadOrWriteException(cause)) {
logger.debug("Trying to recover from dead Channel: {}", channel);
future.pendingException = cause;
return;
}
} else if (attribute instanceof OnLastHttpContentCallback) {
future = OnLastHttpContentCallback.class.cast(attribute).future();
}
} catch (Throwable t) {
cause = t;
}
if (future != null)
try {
logger.debug("Was unable to recover Future: {}", future);
requestSender.abort(channel, future, cause);
handleException(future, e);
} catch (Throwable t) {
logger.error(t.getMessage(), t);
}
channelManager.closeChannel(channel);
// FIXME not really sure
// ctx.fireChannelRead(e);
Channels.silentlyCloseChannel(channel);
}
@Override
public void channelActive(ChannelHandlerContext ctx) {
ctx.read();
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) {
if (!isHandledByReactiveStreams(ctx)) {
ctx.read();
} else {
ctx.fireChannelReadComplete();
}
}
private boolean isHandledByReactiveStreams(ChannelHandlerContext ctx) {
return Channels.getAttribute(ctx.channel()) instanceof StreamedResponsePublisher;
}
void finishUpdate(NettyResponseFuture future, Channel channel, boolean close) {
future.cancelTimeouts();
if (close) {
channelManager.closeChannel(channel);
} else {
channelManager.tryToOfferChannelToPool(channel, future.getAsyncHandler(), true, future.getPartitionKey());
}
try {
future.done();
} catch (Exception t) {
// Never propagate exception once we know we are done.
logger.debug(t.getMessage(), t);
}
}
public abstract void handleRead(Channel channel, NettyResponseFuture future, Object message) throws Exception;
public abstract void handleException(NettyResponseFuture future, Throwable error);
public abstract void handleChannelInactive(NettyResponseFuture future);
}