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Async Http Client library purpose is to allow Java applications to easily execute HTTP requests and
asynchronously process the HTTP responses.
/*
* Copyright (c) 2014-2015 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 com.ning.http.client.providers.netty.request;
import static com.ning.http.util.AsyncHttpProviderUtils.WEBSOCKET;
import static com.ning.http.util.AsyncHttpProviderUtils.isSecure;
import static com.ning.http.util.AsyncHttpProviderUtils.useProxyConnect;
import static com.ning.http.util.AsyncHttpProviderUtils.REMOTELY_CLOSED_EXCEPTION;
import static com.ning.http.util.AsyncHttpProviderUtils.getDefaultPort;
import static com.ning.http.util.AsyncHttpProviderUtils.requestTimeout;
import static com.ning.http.util.AuthenticatorUtils.perConnectionAuthorizationHeader;
import static com.ning.http.util.AuthenticatorUtils.perConnectionProxyAuthorizationHeader;
import static com.ning.http.util.ProxyUtils.avoidProxy;
import static com.ning.http.util.ProxyUtils.getProxyServer;
import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.handler.codec.http.HttpHeaders;
import org.jboss.netty.handler.codec.http.HttpMethod;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.util.Timeout;
import org.jboss.netty.util.Timer;
import org.jboss.netty.util.TimerTask;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.ning.http.client.AsyncHandler;
import com.ning.http.client.AsyncHandlerExtensions;
import com.ning.http.client.AsyncHttpClientConfig;
import com.ning.http.client.ConnectionPoolPartitioning;
import com.ning.http.client.FluentCaseInsensitiveStringsMap;
import com.ning.http.client.ListenableFuture;
import com.ning.http.client.ProxyServer;
import com.ning.http.client.Realm;
import com.ning.http.client.Request;
import com.ning.http.client.filter.FilterContext;
import com.ning.http.client.filter.FilterException;
import com.ning.http.client.filter.IOExceptionFilter;
import com.ning.http.client.listener.TransferCompletionHandler;
import com.ning.http.client.providers.netty.NettyAsyncHttpProviderConfig;
import com.ning.http.client.providers.netty.channel.ChannelManager;
import com.ning.http.client.providers.netty.channel.Channels;
import com.ning.http.client.providers.netty.future.NettyResponseFuture;
import com.ning.http.client.providers.netty.request.timeout.ReadTimeoutTimerTask;
import com.ning.http.client.providers.netty.request.timeout.RequestTimeoutTimerTask;
import com.ning.http.client.providers.netty.request.timeout.TimeoutsHolder;
import com.ning.http.client.uri.Uri;
import com.ning.http.client.ws.WebSocketUpgradeHandler;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
public final class NettyRequestSender {
private static final Logger LOGGER = LoggerFactory.getLogger(NettyRequestSender.class);
private final AsyncHttpClientConfig config;
private final ChannelManager channelManager;
private final Timer nettyTimer;
private final AtomicBoolean closed;
private final NettyRequestFactory requestFactory;
public NettyRequestSender(AsyncHttpClientConfig config,//
NettyAsyncHttpProviderConfig nettyConfig,//
ChannelManager channelManager,//
Timer nettyTimer,//
AtomicBoolean closed) {
this.config = config;
this.channelManager = channelManager;
this.nettyTimer = nettyTimer;
this.closed = closed;
requestFactory = new NettyRequestFactory(config, nettyConfig);
}
public ListenableFuture sendRequest(final Request request,//
final AsyncHandler asyncHandler,//
NettyResponseFuture future,//
boolean reclaimCache) throws IOException {
if (closed.get())
throw new IOException("Closed");
Uri uri = request.getUri();
validateWebSocketRequest(request, uri, asyncHandler);
ProxyServer proxyServer = getProxyServer(config, request);
boolean resultOfAConnect = future != null && future.getNettyRequest() != null
&& future.getNettyRequest().getHttpRequest().getMethod() == HttpMethod.CONNECT;
boolean useProxy = proxyServer != null && !resultOfAConnect;
if (useProxy && useProxyConnect(uri))
// SSL proxy, have to handle CONNECT
if (future != null && future.isConnectAllowed())
// CONNECT forced
return sendRequestWithCertainForceConnect(request, asyncHandler, future, reclaimCache, uri, proxyServer, true, true);
else
return sendRequestThroughSslProxy(request, asyncHandler, future, reclaimCache, uri, proxyServer);
else
return sendRequestWithCertainForceConnect(request, asyncHandler, future, reclaimCache, uri, proxyServer, useProxy, false);
}
/**
* We know for sure if we have to force to connect or not, so we can
* build the HttpRequest right away
* This reduces the probability of having a pooled channel closed by the
* server by the time we build the request
*/
private ListenableFuture sendRequestWithCertainForceConnect(//
Request request,//
AsyncHandler asyncHandler,//
NettyResponseFuture future,//
boolean reclaimCache,//
Uri uri,//
ProxyServer proxyServer,//
boolean useProxy,//
boolean forceConnect) throws IOException {
NettyResponseFuture newFuture = newNettyRequestAndResponseFuture(request, asyncHandler, future, uri, proxyServer, forceConnect);
Channel channel = getCachedChannel(future, uri, request.getConnectionPoolPartitioning(), proxyServer, asyncHandler);
if (Channels.isChannelValid(channel))
return sendRequestWithCachedChannel(request, uri, proxyServer, newFuture, asyncHandler, channel);
else
return sendRequestWithNewChannel(request, uri, proxyServer, useProxy, newFuture, asyncHandler, reclaimCache);
}
/**
* Using CONNECT depends on wither we can fetch a valid channel or not
* Loop until we get a valid channel from the pool and it's still valid
* once the request is built
*/
@SuppressWarnings("unused")
private ListenableFuture sendRequestThroughSslProxy(//
Request request,//
AsyncHandler asyncHandler,//
NettyResponseFuture future,//
boolean reclaimCache,//
Uri uri,//
ProxyServer proxyServer) throws IOException {
NettyResponseFuture newFuture = null;
for (int i = 0; i < 3; i++) {
Channel channel = getCachedChannel(future, uri, request.getConnectionPoolPartitioning(), proxyServer, asyncHandler);
if (Channels.isChannelValid(channel))
if (newFuture == null)
newFuture = newNettyRequestAndResponseFuture(request, asyncHandler, future, uri, proxyServer, false);
if (Channels.isChannelValid(channel))
// if the channel is still active, we can use it, otherwise try gain
return sendRequestWithCachedChannel(request, uri, proxyServer, newFuture, asyncHandler, channel);
else
// pool is empty
break;
}
newFuture = newNettyRequestAndResponseFuture(request, asyncHandler, future, uri, proxyServer, true);
return sendRequestWithNewChannel(request, uri, proxyServer, true, newFuture, asyncHandler, reclaimCache);
}
private NettyResponseFuture newNettyRequestAndResponseFuture(final Request request, final AsyncHandler asyncHandler,
NettyResponseFuture originalFuture, Uri uri, ProxyServer proxy, boolean forceConnect) throws IOException {
NettyRequest nettyRequest = requestFactory.newNettyRequest(request, uri, forceConnect, proxy);
if (originalFuture == null) {
return newNettyResponseFuture(uri, request, asyncHandler, nettyRequest, proxy);
} else {
originalFuture.setNettyRequest(nettyRequest);
originalFuture.setRequest(request);
return originalFuture;
}
}
private Channel getCachedChannel(NettyResponseFuture future, Uri uri, ConnectionPoolPartitioning partitioning,
ProxyServer proxyServer, AsyncHandler asyncHandler) {
if (future != null && future.reuseChannel() && Channels.isChannelValid(future.channel()))
return future.channel();
else
return pollAndVerifyCachedChannel(uri, proxyServer, partitioning, asyncHandler);
}
private ListenableFuture sendRequestWithCachedChannel(Request request, Uri uri, ProxyServer proxy,
NettyResponseFuture future, AsyncHandler asyncHandler, Channel channel) throws IOException {
if (asyncHandler instanceof AsyncHandlerExtensions)
AsyncHandlerExtensions.class.cast(asyncHandler).onConnectionPooled();
future.setState(NettyResponseFuture.STATE.POOLED);
future.attachChannel(channel, false);
LOGGER.debug("Using cached Channel {} for {} '{}'",
channel,
future.getNettyRequest().getHttpRequest().getMethod(),
future.getNettyRequest().getHttpRequest().getUri());
if (Channels.isChannelValid(channel)) {
Channels.setAttribute(channel, future);
try {
writeRequest(future, channel);
} catch (Exception ex) {
// write request isn't supposed to throw Exceptions
LOGGER.debug("writeRequest failure", ex);
if (ex.getMessage() != null && ex.getMessage().contains("SSLEngine")) {
// FIXME what is this for? https://github.com/AsyncHttpClient/async-http-client/commit/a847c3d4523ccc09827743e15b17e6bab59c553b
// can such an exception happen as we write async?
LOGGER.debug("SSLEngine failure", ex);
future = null;
} else {
try {
asyncHandler.onThrowable(ex);
} catch (Throwable t) {
LOGGER.warn("doConnect.writeRequest()", t);
}
IOException ioe = new IOException(ex.getMessage());
ioe.initCause(ex);
throw ioe;
}
}
} else {
// bad luck, the channel was closed in-between
// there's a very good chance onClose was already notified but the future wasn't already registered
handleUnexpectedClosedChannel(channel, future);
}
return future;
}
private ListenableFuture sendRequestWithNewChannel(//
Request request,//
Uri uri,//
ProxyServer proxy,//
boolean useProxy,//
NettyResponseFuture future,//
AsyncHandler asyncHandler,//
boolean reclaimCache) throws IOException {
boolean useSSl = isSecure(uri) && !useProxy;
// some headers are only set when performing the first request
HttpHeaders headers = future.getNettyRequest().getHttpRequest().headers();
Realm realm = request.getRealm() != null ? request.getRealm() : config.getRealm();
boolean connect = future.getNettyRequest().getHttpRequest().getMethod() == HttpMethod.CONNECT;
requestFactory.addAuthorizationHeader(headers, perConnectionAuthorizationHeader(request, uri, proxy, realm));
requestFactory.setProxyAuthorizationHeader(headers, perConnectionProxyAuthorizationHeader(request, proxy, connect));
// Do not throw an exception when we need an extra connection for a
// redirect
// FIXME why? This violate the max connection per host handling, right?
ClientBootstrap bootstrap = channelManager.getBootstrap(request.getUri().getScheme(), useProxy, useSSl);
boolean channelPreempted = false;
Object partitionKey = future.getPartitionKey();
try {
// Do not throw an exception when we need an extra connection for a redirect.
if (!reclaimCache) {
channelManager.preemptChannel(partitionKey);
channelPreempted = true;
}
if (asyncHandler instanceof AsyncHandlerExtensions)
AsyncHandlerExtensions.class.cast(asyncHandler).onOpenConnection();
ChannelFuture channelFuture = connect(request, uri, proxy, useProxy, bootstrap, asyncHandler);
channelFuture.addListener(new NettyConnectListener(future, this, channelManager, channelPreempted, partitionKey));
} catch (Throwable t) {
if (channelPreempted)
channelManager.abortChannelPreemption(partitionKey);
abort(null, future, t.getCause() == null ? t : t.getCause());
}
return future;
}
private NettyResponseFuture newNettyResponseFuture(Uri uri, Request request, AsyncHandler asyncHandler,
NettyRequest nettyRequest, ProxyServer proxyServer) {
NettyResponseFuture future = new NettyResponseFuture<>(//
uri,//
request,//
asyncHandler,//
nettyRequest,//
config.getMaxRequestRetry(),//
request.getConnectionPoolPartitioning(),//
proxyServer);
String expectHeader = request.getHeaders().getFirstValue(HttpHeaders.Names.EXPECT);
if (expectHeader != null && expectHeader.equalsIgnoreCase(HttpHeaders.Values.CONTINUE))
future.setDontWriteBodyBecauseExpectContinue(true);
return future;
}
public void writeRequest(NettyResponseFuture future, Channel channel) {
NettyRequest nettyRequest = future.getNettyRequest();
HttpRequest httpRequest = nettyRequest.getHttpRequest();
AsyncHandler handler = future.getAsyncHandler();
// if the channel is dead because it was pooled and the remote
// server decided to close it,
// we just let it go and the channelInactive do its work
if (!Channels.isChannelValid(channel))
return;
try {
if (handler instanceof TransferCompletionHandler)
configureTransferAdapter(handler, httpRequest);
if (!future.isHeadersAlreadyWrittenOnContinue()) {
if (future.getAsyncHandler() instanceof AsyncHandlerExtensions)
AsyncHandlerExtensions.class.cast(future.getAsyncHandler()).onSendRequest(nettyRequest);
channel.write(httpRequest).addListener(new ProgressListener(config, future.getAsyncHandler(), future, true));
}
if (nettyRequest.getBody() != null && !future.isDontWriteBodyBecauseExpectContinue() && httpRequest.getMethod() != HttpMethod.CONNECT)
nettyRequest.getBody().write(channel, future, config);
// don't bother scheduling timeouts if channel became invalid
if (Channels.isChannelValid(channel))
scheduleTimeouts(future);
} catch (Throwable t) {
LOGGER.error("Can't write request", t);
Channels.silentlyCloseChannel(channel);
}
}
private InetSocketAddress remoteAddress(Request request, Uri uri, ProxyServer proxy, boolean useProxy) throws UnknownHostException {
InetAddress address;
int port = getDefaultPort(uri);
if (request.getInetAddress() != null) {
address = request.getInetAddress();
} else if (!useProxy || avoidProxy(proxy, uri.getHost())) {
address = request.getNameResolver().resolve(uri.getHost());
} else {
address = request.getNameResolver().resolve(proxy.getHost());
port = proxy.getPort();
}
return new InetSocketAddress(address, port);
}
private ChannelFuture connect(Request request, Uri uri, ProxyServer proxy, boolean useProxy, ClientBootstrap bootstrap, AsyncHandler asyncHandler) throws UnknownHostException {
InetSocketAddress remoteAddress = remoteAddress(request, uri, proxy, useProxy);
if (asyncHandler instanceof AsyncHandlerExtensions)
AsyncHandlerExtensions.class.cast(asyncHandler).onDnsResolved(remoteAddress.getAddress());
if (request.getLocalAddress() != null)
return bootstrap.connect(remoteAddress, new InetSocketAddress(request.getLocalAddress(), 0));
else
return bootstrap.connect(remoteAddress);
}
private void configureTransferAdapter(AsyncHandler handler, HttpRequest httpRequest) {
FluentCaseInsensitiveStringsMap h = new FluentCaseInsensitiveStringsMap();
for (Map.Entry entries : httpRequest.headers()) {
h.add(entries.getKey(), entries.getValue());
}
TransferCompletionHandler.class.cast(handler).headers(h);
}
private void scheduleTimeouts(NettyResponseFuture nettyResponseFuture) {
nettyResponseFuture.touch();
int requestTimeoutInMs = requestTimeout(config, nettyResponseFuture.getRequest());
TimeoutsHolder timeoutsHolder = new TimeoutsHolder();
if (requestTimeoutInMs != -1) {
Timeout requestTimeout = newTimeout(new RequestTimeoutTimerTask(nettyResponseFuture, this, timeoutsHolder,
requestTimeoutInMs), requestTimeoutInMs);
timeoutsHolder.requestTimeout = requestTimeout;
}
int readTimeoutValue = config.getReadTimeout();
if (readTimeoutValue != -1 && readTimeoutValue < requestTimeoutInMs) {
// no need for a readTimeout that's less than the requestTimeout
Timeout readTimeout = newTimeout(new ReadTimeoutTimerTask(nettyResponseFuture, this, timeoutsHolder,
requestTimeoutInMs, readTimeoutValue), readTimeoutValue);
timeoutsHolder.readTimeout = readTimeout;
}
nettyResponseFuture.setTimeoutsHolder(timeoutsHolder);
}
public Timeout newTimeout(TimerTask task, long delay) {
return nettyTimer.newTimeout(task, delay, TimeUnit.MILLISECONDS);
}
public void abort(Channel channel, NettyResponseFuture future, Throwable t) {
if (channel != null)
channelManager.closeChannel(channel);
if (!future.isDone()) {
LOGGER.debug("Aborting Future {}\n", future);
LOGGER.debug(t.getMessage(), t);
future.abort(t);
}
}
public void handleUnexpectedClosedChannel(Channel channel, NettyResponseFuture future) {
if (future.isDone())
channelManager.closeChannel(channel);
else if (!retry(future))
abort(channel, future, REMOTELY_CLOSED_EXCEPTION);
}
public boolean retry(NettyResponseFuture future) {
if (isClosed())
return false;
// FIXME this was done in AHC2, is this a bug?
// channelManager.removeAll(channel);
if (future.canBeReplayed()) {
future.setState(NettyResponseFuture.STATE.RECONNECTED);
LOGGER.debug("Trying to recover request {}\n", future.getNettyRequest().getHttpRequest());
if (future.getAsyncHandler() instanceof AsyncHandlerExtensions)
AsyncHandlerExtensions.class.cast(future.getAsyncHandler()).onRetry();
try {
sendNextRequest(future.getRequest(), future);
return true;
} catch (IOException iox) {
future.setState(NettyResponseFuture.STATE.CLOSED);
future.abort(iox);
LOGGER.error("Remotely closed, unable to recover", iox);
return false;
}
} else {
LOGGER.debug("Unable to recover future {}\n", future);
return false;
}
}
public boolean applyIoExceptionFiltersAndReplayRequest(NettyResponseFuture future, IOException e, Channel channel)
throws IOException {
boolean replayed = false;
@SuppressWarnings({ "unchecked", "rawtypes" })
FilterContext fc = new FilterContext.FilterContextBuilder().asyncHandler(future.getAsyncHandler()).request(future.getRequest())
.ioException(e).build();
for (IOExceptionFilter asyncFilter : config.getIOExceptionFilters()) {
try {
fc = asyncFilter.filter(fc);
if (fc == null) {
throw new NullPointerException("FilterContext is null");
}
} catch (FilterException efe) {
abort(channel, future, efe);
}
}
if (fc.replayRequest() && future.canBeReplayed()) {
replayRequest(future, fc, channel);
replayed = true;
}
return replayed;
}
public void sendNextRequest(Request request, NettyResponseFuture future) throws IOException {
sendRequest(request, future.getAsyncHandler(), future, true);
}
private void validateWebSocketRequest(Request request, Uri uri, AsyncHandler asyncHandler) {
if (asyncHandler instanceof WebSocketUpgradeHandler) {
if (!uri.getScheme().startsWith(WEBSOCKET))
throw new IllegalArgumentException("WebSocketUpgradeHandler but scheme isn't ws or wss: " + uri.getScheme());
else if (!request.getMethod().equals(HttpMethod.GET.getName()))
throw new IllegalArgumentException("WebSocketUpgradeHandler but method isn't GET: " + request.getMethod());
} else if (uri.getScheme().startsWith(WEBSOCKET)) {
throw new IllegalArgumentException("No WebSocketUpgradeHandler but scheme is " + uri.getScheme());
}
}
public Channel pollAndVerifyCachedChannel(Uri uri, ProxyServer proxy, ConnectionPoolPartitioning connectionPoolPartitioning, AsyncHandler asyncHandler) {
if (asyncHandler instanceof AsyncHandlerExtensions)
AsyncHandlerExtensions.class.cast(asyncHandler).onPoolConnection();
final Channel channel = channelManager.poll(uri, proxy, connectionPoolPartitioning);
if (channel != null) {
LOGGER.debug("Using cached Channel {}\n for uri {}\n", channel, uri);
try {
// Always make sure the channel who got cached support the proper protocol. It could
// only occurs when a HttpMethod.CONNECT is used against a proxy that requires upgrading from http to
// https.
channelManager.verifyChannelPipeline(channel.getPipeline(), uri.getScheme());
} catch (Exception ex) {
LOGGER.debug(ex.getMessage(), ex);
}
}
return channel;
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public void replayRequest(final NettyResponseFuture future, FilterContext fc, Channel channel) throws IOException {
final Request newRequest = fc.getRequest();
future.setAsyncHandler(fc.getAsyncHandler());
future.setState(NettyResponseFuture.STATE.NEW);
future.touch();
LOGGER.debug("\n\nReplaying Request {}\n for Future {}\n", newRequest, future);
if (future.getAsyncHandler() instanceof AsyncHandlerExtensions)
AsyncHandlerExtensions.class.cast(future.getAsyncHandler()).onRetry();
channelManager.drainChannelAndOffer(channel, future);
sendNextRequest(newRequest, future);
return;
}
public boolean isClosed() {
return closed.get();
}
}
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