io.undertow.client.http.HttpClientConnection Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.undertow.client.http;
import io.undertow.UndertowLogger;
import io.undertow.UndertowOptions;
import io.undertow.client.ClientCallback;
import io.undertow.client.ClientConnection;
import io.undertow.client.ClientExchange;
import io.undertow.client.ClientRequest;
import io.undertow.client.ClientResponse;
import io.undertow.client.ClientStatistics;
import io.undertow.client.UndertowClientMessages;
import io.undertow.client.http2.Http2ClearClientProvider;
import io.undertow.client.http2.Http2ClientConnection;
import io.undertow.conduits.ByteActivityCallback;
import io.undertow.conduits.BytesReceivedStreamSourceConduit;
import io.undertow.conduits.BytesSentStreamSinkConduit;
import io.undertow.conduits.ChunkedStreamSinkConduit;
import io.undertow.conduits.ChunkedStreamSourceConduit;
import io.undertow.conduits.ConduitListener;
import io.undertow.conduits.FinishableStreamSourceConduit;
import io.undertow.conduits.FixedLengthStreamSourceConduit;
import io.undertow.protocols.http2.Http2Channel;
import io.undertow.server.Connectors;
import io.undertow.server.protocol.http.HttpContinue;
import io.undertow.util.AbstractAttachable;
import io.undertow.util.ConnectionUtils;
import io.undertow.util.Headers;
import io.undertow.util.HttpString;
import io.undertow.util.Methods;
import io.undertow.util.PooledAdaptor;
import io.undertow.util.Protocols;
import io.undertow.util.StatusCodes;
import org.jboss.logging.Logger;
import org.xnio.ChannelExceptionHandler;
import org.xnio.ChannelListener;
import org.xnio.ChannelListeners;
import org.xnio.Option;
import org.xnio.OptionMap;
import io.undertow.connector.ByteBufferPool;
import io.undertow.connector.PooledByteBuffer;
import org.xnio.StreamConnection;
import org.xnio.XnioIoThread;
import org.xnio.XnioWorker;
import org.xnio.channels.StreamSourceChannel;
import org.xnio.conduits.ConduitStreamSinkChannel;
import org.xnio.conduits.ConduitStreamSourceChannel;
import org.xnio.conduits.PushBackStreamSourceConduit;
import org.xnio.conduits.StreamSinkConduit;
import org.xnio.conduits.StreamSourceConduit;
import org.xnio.ssl.SslConnection;
import java.io.Closeable;
import java.io.IOException;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.CopyOnWriteArrayList;
import static io.undertow.client.UndertowClientMessages.MESSAGES;
import static org.xnio.Bits.allAreClear;
import static org.xnio.Bits.allAreSet;
import static org.xnio.Bits.anyAreSet;
import static org.xnio.IoUtils.safeClose;
/**
* @author David M. Lloyd
*/
class HttpClientConnection extends AbstractAttachable implements Closeable, ClientConnection {
public final ConduitListener requestFinishListener = new ConduitListener() {
@Override
public void handleEvent(StreamSinkConduit channel) {
if(currentRequest != null) {
currentRequest.terminateRequest();
}
}
};
public final ConduitListener responseFinishedListener = new ConduitListener() {
@Override
public void handleEvent(StreamSourceConduit channel) {
if(currentRequest != null) {
currentRequest.terminateResponse();
}
}
};
private static final Logger log = Logger.getLogger(HttpClientConnection.class);
private final Deque pendingQueue = new ArrayDeque<>();
private HttpClientExchange currentRequest;
private HttpResponseBuilder pendingResponse;
private final OptionMap options;
private final StreamConnection connection;
private final PushBackStreamSourceConduit pushBackStreamSourceConduit;
private final ClientReadListener clientReadListener = new ClientReadListener();
private final ByteBufferPool bufferPool;
private PooledByteBuffer pooledBuffer;
private final StreamSinkConduit originalSinkConduit;
private static final int UPGRADED = 1 << 28;
private static final int UPGRADE_REQUESTED = 1 << 29;
private static final int CLOSE_REQ = 1 << 30;
private static final int CLOSED = 1 << 31;
private int state;
private final ChannelListener.SimpleSetter closeSetter = new ChannelListener.SimpleSetter<>();
private final ClientStatistics clientStatistics;
private int requestCount;
private int read, written;
private boolean http2Tried = false;
private boolean http2UpgradeReceived = false;
/**
* The actual connection if this has been upgraded to h2c
*/
private ClientConnection http2Delegate;
private final List> closeListeners = new CopyOnWriteArrayList<>();
HttpClientConnection(final StreamConnection connection, final OptionMap options, final ByteBufferPool bufferPool) {
//first we set up statistics, if required
if(options.get(UndertowOptions.ENABLE_STATISTICS, false)) {
clientStatistics = new ClientStatisticsImpl();
connection.getSinkChannel().setConduit(new BytesSentStreamSinkConduit(connection.getSinkChannel().getConduit(), new ByteActivityCallback() {
@Override
public void activity(long bytes) {
written+=bytes;
}
}));
connection.getSourceChannel().setConduit(new BytesReceivedStreamSourceConduit(connection.getSourceChannel().getConduit(), new ByteActivityCallback() {
@Override
public void activity(long bytes) {
read+=bytes;
}
}));
} else {
clientStatistics = null;
}
this.options = options;
this.connection = connection;
this.pushBackStreamSourceConduit = new PushBackStreamSourceConduit(connection.getSourceChannel().getConduit());
this.connection.getSourceChannel().setConduit(pushBackStreamSourceConduit);
this.bufferPool = bufferPool;
this.originalSinkConduit = connection.getSinkChannel().getConduit();
connection.getCloseSetter().set(new ChannelListener() {
public void handleEvent(StreamConnection channel) {
log.debugf("connection to %s closed", getPeerAddress());
HttpClientConnection.this.state |= CLOSED;
ChannelListeners.invokeChannelListener(HttpClientConnection.this, closeSetter.get());
try {
if (pooledBuffer != null) {
pooledBuffer.close();
}
} catch (Throwable ignored){}
for(ChannelListener listener : closeListeners) {
listener.handleEvent(HttpClientConnection.this);
}
HttpClientExchange pending = pendingQueue.poll();
while (pending != null) {
pending.setFailed(new ClosedChannelException());
pending = pendingQueue.poll();
}
if(currentRequest != null) {
currentRequest.setFailed(new ClosedChannelException());
currentRequest = null;
pendingResponse = null;
}
}
});
//we resume reads, so if the target goes away we get notified
connection.getSourceChannel().setReadListener(clientReadListener);
connection.getSourceChannel().resumeReads();
}
@Override
public ByteBufferPool getBufferPool() {
return bufferPool;
}
@Override
public SocketAddress getPeerAddress() {
return connection.getPeerAddress();
}
StreamConnection getConnection() {
return connection;
}
@Override
public A getPeerAddress(Class type) {
return connection.getPeerAddress(type);
}
@Override
public ChannelListener.Setter getCloseSetter() {
return closeSetter;
}
@Override
public SocketAddress getLocalAddress() {
return connection.getLocalAddress();
}
@Override
public A getLocalAddress(Class type) {
return connection.getLocalAddress(type);
}
@Override
public XnioWorker getWorker() {
return connection.getWorker();
}
@Override
public XnioIoThread getIoThread() {
return connection.getIoThread();
}
@Override
public boolean isOpen() {
if(http2Delegate != null) {
return http2Delegate.isOpen();
}
return connection.isOpen() && allAreClear(state, CLOSE_REQ | CLOSED);
}
@Override
public boolean supportsOption(Option option) {
if(http2Delegate != null) {
return http2Delegate.supportsOption(option);
}
return connection.supportsOption(option);
}
@Override
public T getOption(Option option) throws IOException {
if(http2Delegate != null) {
return http2Delegate.getOption(option);
}
return connection.getOption(option);
}
@Override
public T setOption(Option option, T value) throws IllegalArgumentException, IOException {
if(http2Delegate != null) {
return http2Delegate.setOption(option, value);
}
return connection.setOption(option, value);
}
@Override
public boolean isUpgraded() {
if(http2Delegate != null) {
return http2Delegate.isUpgraded();
}
return anyAreSet(state, UPGRADE_REQUESTED | UPGRADED);
}
@Override
public boolean isPushSupported() {
if(http2Delegate != null) {
return http2Delegate.isPushSupported();
}
return false;
}
@Override
public boolean isMultiplexingSupported() {
if(http2Delegate != null) {
return http2Delegate.isMultiplexingSupported();
}
return false;
}
@Override
public ClientStatistics getStatistics() {
if(http2Delegate != null) {
return http2Delegate.getStatistics();
}
return clientStatistics;
}
@Override
public boolean isUpgradeSupported() {
if(http2Delegate != null) {
return false;
}
return true;
}
@Override
public void addCloseListener(ChannelListener listener) {
closeListeners.add(listener);
}
@Override
public void sendRequest(final ClientRequest request, final ClientCallback clientCallback) {
if(http2Delegate != null) {
http2Delegate.sendRequest(request, clientCallback);
return;
}
if (anyAreSet(state, UPGRADE_REQUESTED | UPGRADED | CLOSE_REQ | CLOSED)) {
clientCallback.failed(UndertowClientMessages.MESSAGES.invalidConnectionState());
return;
}
final HttpClientExchange httpClientExchange = new HttpClientExchange(clientCallback, request, this);
boolean ssl = this.connection instanceof SslConnection;
if(!ssl && !http2Tried && options.get(UndertowOptions.ENABLE_HTTP2, false) && !request.getRequestHeaders().contains(Headers.UPGRADE)) {
//this is the first request, as we want to try a HTTP2 upgrade
request.getRequestHeaders().put(new HttpString("HTTP2-Settings"), Http2ClearClientProvider.createSettingsFrame(options, bufferPool));
request.getRequestHeaders().put(Headers.UPGRADE, Http2Channel.CLEARTEXT_UPGRADE_STRING);
request.getRequestHeaders().put(Headers.CONNECTION, "Upgrade, HTTP2-Settings");
http2Tried = true;
}
if (currentRequest == null) {
initiateRequest(httpClientExchange);
} else {
pendingQueue.add(httpClientExchange);
}
}
private void initiateRequest(HttpClientExchange httpClientExchange) {
this.requestCount++;
currentRequest = httpClientExchange;
pendingResponse = new HttpResponseBuilder();
ClientRequest request = httpClientExchange.getRequest();
String connectionString = request.getRequestHeaders().getFirst(Headers.CONNECTION);
if (connectionString != null) {
if (Headers.CLOSE.equalToString(connectionString)) {
state |= CLOSE_REQ;
} else if (Headers.UPGRADE.equalToString(connectionString)) {
state |= UPGRADE_REQUESTED;
}
} else if (request.getProtocol() != Protocols.HTTP_1_1) {
state |= CLOSE_REQ;
}
if (request.getRequestHeaders().contains(Headers.UPGRADE)) {
state |= UPGRADE_REQUESTED;
}
if(request.getMethod().equals(Methods.CONNECT)) {
//we treat CONNECT like upgrade requests
state |= UPGRADE_REQUESTED;
}
//setup the client request conduits
final ConduitStreamSourceChannel sourceChannel = connection.getSourceChannel();
sourceChannel.setReadListener(clientReadListener);
sourceChannel.resumeReads();
ConduitStreamSinkChannel sinkChannel = connection.getSinkChannel();
StreamSinkConduit conduit = originalSinkConduit;
HttpRequestConduit httpRequestConduit = new HttpRequestConduit(conduit, bufferPool, request);
httpClientExchange.setRequestConduit(httpRequestConduit);
conduit = httpRequestConduit;
String fixedLengthString = request.getRequestHeaders().getFirst(Headers.CONTENT_LENGTH);
String transferEncodingString = request.getRequestHeaders().getLast(Headers.TRANSFER_ENCODING);
boolean hasContent = true;
if (fixedLengthString != null) {
try {
long length = Long.parseLong(fixedLengthString);
conduit = new ClientFixedLengthStreamSinkConduit(conduit, length, false, false, currentRequest);
hasContent = length != 0;
} catch (NumberFormatException e) {
handleError(e);
return;
}
} else if (transferEncodingString != null) {
if (!transferEncodingString.toLowerCase(Locale.ENGLISH).contains(Headers.CHUNKED.toString())) {
handleError(UndertowClientMessages.MESSAGES.unknownTransferEncoding(transferEncodingString));
return;
}
conduit = new ChunkedStreamSinkConduit(conduit, httpClientExchange.getConnection().getBufferPool(), false, false, httpClientExchange.getRequest().getRequestHeaders(), requestFinishListener, httpClientExchange);
} else {
conduit = new ClientFixedLengthStreamSinkConduit(conduit, 0, false, false, currentRequest);
hasContent = false;
}
sinkChannel.setConduit(conduit);
httpClientExchange.invokeReadReadyCallback();
if (!hasContent) {
//if there is no content we flush the response channel.
//otherwise it is up to the user
try {
sinkChannel.shutdownWrites();
if (!sinkChannel.flush()) {
sinkChannel.setWriteListener(ChannelListeners.flushingChannelListener(null, new ChannelExceptionHandler() {
@Override
public void handleException(ConduitStreamSinkChannel channel, IOException exception) {
handleError(exception);
}
}));
sinkChannel.resumeWrites();
}
} catch (Throwable t) {
handleError(t);
}
}
}
private void handleError(Throwable exception) {
if (exception instanceof IOException) {
handleError((IOException) exception);
} else {
handleError(new IOException(exception));
}
}
private void handleError(IOException exception) {
UndertowLogger.REQUEST_IO_LOGGER.ioException(exception);
currentRequest.setFailed(exception);
currentRequest = null;
pendingResponse = null;
safeClose(connection);
}
public StreamConnection performUpgrade() throws IOException {
log.debugf("connection to %s is being upgraded", getPeerAddress());
// Upgrade the connection
// Set the upgraded flag already to prevent new requests after this one
if (allAreSet(state, UPGRADED | CLOSE_REQ | CLOSED)) {
throw new IOException(UndertowClientMessages.MESSAGES.connectionClosed());
}
state |= UPGRADED;
connection.getSinkChannel().setConduit(originalSinkConduit);
connection.getSourceChannel().setConduit(pushBackStreamSourceConduit);
return connection;
}
public void close() throws IOException {
log.debugf("close called on connection to %s", getPeerAddress());
if(http2Delegate != null) {
http2Delegate.close();
}
if (anyAreSet(state, CLOSED)) {
return;
}
state |= CLOSED | CLOSE_REQ;
ConnectionUtils.cleanClose(connection);
}
/**
* Notification that the current request is finished
*/
public void exchangeDone() {
log.debugf("exchange complete in connection to %s", getPeerAddress());
connection.getSinkChannel().setConduit(originalSinkConduit);
connection.getSourceChannel().setConduit(pushBackStreamSourceConduit);
connection.getSinkChannel().suspendWrites();
connection.getSinkChannel().setWriteListener(null);
if (anyAreSet(state, CLOSE_REQ)) {
currentRequest = null;
pendingResponse = null;
this.state |= CLOSED;
safeClose(connection);
} else if (anyAreSet(state, UPGRADE_REQUESTED)) {
connection.getSourceChannel().suspendReads();
currentRequest = null;
pendingResponse = null;
return;
}
currentRequest = null;
pendingResponse = null;
HttpClientExchange next = pendingQueue.poll();
if (next == null) {
//we resume reads, so if the target goes away we get notified
connection.getSourceChannel().setReadListener(clientReadListener);
connection.getSourceChannel().resumeReads();
} else {
initiateRequest(next);
}
}
public void requestDataSent() {
if(http2UpgradeReceived) {
doHttp2Upgrade();
}
}
class ClientReadListener implements ChannelListener {
public void handleEvent(StreamSourceChannel channel) {
HttpResponseBuilder builder = pendingResponse;
final PooledByteBuffer pooled = bufferPool.allocate();
final ByteBuffer buffer = pooled.getBuffer();
boolean free = true;
try {
if (builder == null) {
//read ready when no request pending
buffer.clear();
try {
int res = channel.read(buffer);
if(res == -1) {
UndertowLogger.CLIENT_LOGGER.debugf("Connection to %s was closed by the target server", connection.getPeerAddress());
safeClose(HttpClientConnection.this);
} else if(res != 0) {
UndertowLogger.CLIENT_LOGGER.debugf("Target server %s sent unexpected data when no request pending, closing connection", connection.getPeerAddress());
safeClose(HttpClientConnection.this);
}
//otherwise it is a spurious notification
} catch (IOException e) {
if (UndertowLogger.CLIENT_LOGGER.isDebugEnabled()) {
UndertowLogger.CLIENT_LOGGER.debugf(e, "Connection closed with IOException");
}
safeClose(connection);
}
return;
}
final ResponseParseState state = builder.getParseState();
int res;
do {
buffer.clear();
try {
res = channel.read(buffer);
} catch (IOException e) {
if (UndertowLogger.CLIENT_LOGGER.isDebugEnabled()) {
UndertowLogger.CLIENT_LOGGER.debugf(e, "Connection closed with IOException");
}
try {
if (currentRequest != null) {
currentRequest.setFailed(e);
currentRequest = null;
}
pendingResponse = null;
} finally {
safeClose(channel, HttpClientConnection.this);
}
return;
}
if (res == 0) {
if (!channel.isReadResumed()) {
channel.getReadSetter().set(this);
channel.resumeReads();
}
return;
} else if (res == -1) {
channel.suspendReads();
try {
// Cancel the current active request
if (currentRequest != null) {
currentRequest.setFailed(new IOException(MESSAGES.connectionClosed()));
currentRequest = null;
}
pendingResponse = null;
} finally {
safeClose(HttpClientConnection.this);
}
return;
}
buffer.flip();
HttpResponseParser.INSTANCE.handle(buffer, state, builder);
if (buffer.hasRemaining()) {
free = false;
pushBackStreamSourceConduit.pushBack(new PooledAdaptor(pooled));
pushBackStreamSourceConduit.wakeupReads();
}
} while (!state.isComplete());
final ClientResponse response = builder.build();
String connectionString = response.getResponseHeaders().getFirst(Headers.CONNECTION);
//check if an upgrade worked
if (anyAreSet(HttpClientConnection.this.state, UPGRADE_REQUESTED)) {
if ((connectionString == null || !Headers.UPGRADE.equalToString(connectionString)) && !response.getResponseHeaders().contains(Headers.UPGRADE)) {
if(!currentRequest.getRequest().getMethod().equals(Methods.CONNECT) || response.getResponseCode() != 200) { //make sure it was not actually a connect request
//just unset the upgrade requested flag
HttpClientConnection.this.state &= ~UPGRADE_REQUESTED;
}
}
}
boolean close = false;
if(connectionString != null) {
if (Headers.CLOSE.equalToString(connectionString)) {
close = true;
} else if(!response.getProtocol().equals(Protocols.HTTP_1_1)) {
if(!Headers.KEEP_ALIVE.equalToString(connectionString)) {
close = true;
}
}
} else if(!response.getProtocol().equals(Protocols.HTTP_1_1)) {
close = true;
}
if(close) {
HttpClientConnection.this.state |= CLOSE_REQ;
//we are going to close, kill any queued connections
HttpClientExchange ex = pendingQueue.poll();
while (ex != null) {
ex.setFailed(new IOException(UndertowClientMessages.MESSAGES.connectionClosed()));
ex = pendingQueue.poll();
}
}
if(response.getResponseCode() == StatusCodes.SWITCHING_PROTOCOLS && Http2Channel.CLEARTEXT_UPGRADE_STRING.equals(response.getResponseHeaders().getFirst(Headers.UPGRADE))) {
//http2 upgrade
http2UpgradeReceived = true;
if(currentRequest.isRequestDataSent()) {
doHttp2Upgrade();
}
} else if (builder.getStatusCode() == StatusCodes.CONTINUE) {
pendingResponse = new HttpResponseBuilder();
currentRequest.setContinueResponse(response);
} else {
prepareResponseChannel(response, currentRequest);
channel.getReadSetter().set(null);
channel.suspendReads();
pendingResponse = null;
currentRequest.setResponse(response);
if(response.getResponseCode() == StatusCodes.EXPECTATION_FAILED) {
if(HttpContinue.requiresContinueResponse(currentRequest.getRequest().getRequestHeaders())) {
HttpClientConnection.this.state |= CLOSE_REQ;
ConduitStreamSinkChannel sinkChannel = HttpClientConnection.this.connection.getSinkChannel();
sinkChannel.shutdownWrites();
if(!sinkChannel.flush()) {
sinkChannel.setWriteListener(ChannelListeners.flushingChannelListener(null, null));
sinkChannel.resumeWrites();
}
if(currentRequest != null) {
//we need the null check as flushing the response may have terminated the request
currentRequest.terminateRequest();
}
}
}
}
} catch (Throwable t) {
UndertowLogger.CLIENT_LOGGER.exceptionProcessingRequest(t);
safeClose(connection);
if(currentRequest != null) {
currentRequest.setFailed(new IOException(t));
}
} finally {
if (free) {
pooled.close();
pooledBuffer = null;
} else {
pooledBuffer = pooled;
}
}
}
}
protected void doHttp2Upgrade() {
try {
StreamConnection connectedStreamChannel = this.performUpgrade();
Http2Channel http2Channel = new Http2Channel(connectedStreamChannel, null, bufferPool, null, true, true, options);
Http2ClientConnection http2ClientConnection = new Http2ClientConnection(http2Channel, currentRequest.getResponseCallback(), currentRequest.getRequest(), currentRequest.getRequest().getRequestHeaders().getFirst(Headers.HOST), clientStatistics, false);
http2ClientConnection.getCloseSetter().set(new ChannelListener() {
@Override
public void handleEvent(ClientConnection channel) {
ChannelListeners.invokeChannelListener(HttpClientConnection.this, HttpClientConnection.this.closeSetter.get());
}
});
http2Delegate = http2ClientConnection;
connectedStreamChannel.getSourceChannel().wakeupReads(); //make sure the read listener is immediately invoked, as it may not happen if data is pushed back
currentRequest = null;
pendingResponse = null;
} catch (IOException e) {
UndertowLogger.REQUEST_IO_LOGGER.ioException(e);
safeClose(this);
}
}
private void prepareResponseChannel(ClientResponse response, ClientExchange exchange) {
String encoding = response.getResponseHeaders().getLast(Headers.TRANSFER_ENCODING);
boolean chunked = encoding != null && Headers.CHUNKED.equals(new HttpString(encoding));
String length = response.getResponseHeaders().getFirst(Headers.CONTENT_LENGTH);
if (exchange.getRequest().getMethod().equals(Methods.HEAD)) {
connection.getSourceChannel().setConduit(new FixedLengthStreamSourceConduit(connection.getSourceChannel().getConduit(), 0, responseFinishedListener));
} else if (chunked) {
connection.getSourceChannel().setConduit(new ChunkedStreamSourceConduit(connection.getSourceChannel().getConduit(), pushBackStreamSourceConduit, bufferPool, responseFinishedListener, exchange, connection));
} else if (length != null) {
try {
long contentLength = Long.parseLong(length);
connection.getSourceChannel().setConduit(new FixedLengthStreamSourceConduit(connection.getSourceChannel().getConduit(), contentLength, responseFinishedListener));
} catch (NumberFormatException e) {
handleError(e);
throw e;
}
} else if (response.getProtocol().equals(Protocols.HTTP_1_1) && !Connectors.isEntityBodyAllowed(response.getResponseCode())) {
connection.getSourceChannel().setConduit(new FixedLengthStreamSourceConduit(connection.getSourceChannel().getConduit(), 0, responseFinishedListener));
} else {
connection.getSourceChannel().setConduit(new FinishableStreamSourceConduit(connection.getSourceChannel().getConduit(), responseFinishedListener));
state |= CLOSE_REQ;
}
}
private class ClientStatisticsImpl implements ClientStatistics {
@Override
public long getRequests() {
return requestCount;
}
@Override
public long getRead() {
return read;
}
@Override
public long getWritten() {
return written;
}
@Override
public void reset() {
read = 0;
written = 0;
requestCount = 0;
}
}
}