/*
* JBoss, Home of Professional Open Source.
* Copyright 2013 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.server.protocol.http;
import io.undertow.UndertowLogger;
import io.undertow.UndertowOptions;
import io.undertow.conduits.ReadDataStreamSourceConduit;
import io.undertow.server.Connectors;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.StringWriteChannelListener;
import org.xnio.ChannelListener;
import org.xnio.IoUtils;
import org.xnio.Pooled;
import org.xnio.StreamConnection;
import org.xnio.channels.StreamSinkChannel;
import org.xnio.channels.StreamSourceChannel;
import org.xnio.conduits.ConduitStreamSourceChannel;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
/**
* Listener which reads requests and headers off of an HTTP stream.
*
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
final class HttpReadListener implements ChannelListener<ConduitStreamSourceChannel>, Runnable {
private static final String BAD_REQUEST = "HTTP/1.1 400 Bad Request\r\nContent-Length: 0\r\nConnection: close\r\n\r\n";
private final HttpServerConnection connection;
private final ParseState state = new ParseState();
private final HttpRequestParser parser;
private HttpServerExchange httpServerExchange;
private int read = 0;
private final int maxRequestSize;
private final long maxEntitySize;
private final boolean recordRequestStartTime;
//0 = new request ok, reads resumed
//1 = request running, new request not ok
//2 = suspending/resuming in progress
private volatile int requestState;
private static final AtomicIntegerFieldUpdater<HttpReadListener> requestStateUpdater = AtomicIntegerFieldUpdater.newUpdater(HttpReadListener.class, "requestState");
HttpReadListener(final HttpServerConnection connection, final HttpRequestParser parser) {
this.connection = connection;
this.parser = parser;
this.maxRequestSize = connection.getUndertowOptions().get(UndertowOptions.MAX_HEADER_SIZE, UndertowOptions.DEFAULT_MAX_HEADER_SIZE);
this.maxEntitySize = connection.getUndertowOptions().get(UndertowOptions.MAX_ENTITY_SIZE, 0);
this.recordRequestStartTime = connection.getUndertowOptions().get(UndertowOptions.RECORD_REQUEST_START_TIME, false);
}
public void newRequest() {
state.reset();
read = 0;
httpServerExchange = new HttpServerExchange(connection, maxEntitySize);
}
public void handleEvent(final ConduitStreamSourceChannel channel) {
while (requestStateUpdater.get(this) != 0) {
//if the CAS fails it is because another thread is in the process of changing state
//we just immediately retry
if (requestStateUpdater.compareAndSet(this, 1, 2)) {
channel.suspendReads();
requestStateUpdater.set(this, 1);
return;
}
}
handleEventWithNoRunningRequest(channel);
}
public void handleEventWithNoRunningRequest(final ConduitStreamSourceChannel channel) {
Pooled<ByteBuffer> existing = connection.getExtraBytes();
if ((existing == null && connection.getOriginalSourceConduit().isReadShutdown()) || connection.getOriginalSinkConduit().isWriteShutdown()) {
IoUtils.safeClose(connection);
channel.suspendReads();
return;
}
final Pooled<ByteBuffer> pooled = existing == null ? connection.getBufferPool().allocate() : existing;
final ByteBuffer buffer = pooled.getResource();
boolean free = true;
try {
int res;
do {
if (existing == null) {
buffer.clear();
try {
res = channel.read(buffer);
} catch (IOException e) {
UndertowLogger.REQUEST_IO_LOGGER.debug("Error reading request", e);
IoUtils.safeClose(connection);
return;
}
} else {
res = buffer.remaining();
}
if (res <= 0) {
handleFailedRead(channel, res);
return;
}
if (existing != null) {
existing = null;
connection.setExtraBytes(null);
} else {
buffer.flip();
}
parser.handle(buffer, state, httpServerExchange);
if (buffer.hasRemaining()) {
free = false;
connection.setExtraBytes(pooled);
}
int total = read + res;
read = total;
if (read > maxRequestSize) {
UndertowLogger.REQUEST_LOGGER.requestHeaderWasTooLarge(connection.getPeerAddress(), maxRequestSize);
IoUtils.safeClose(connection);
return;
}
} while (!state.isComplete());
final HttpServerExchange httpServerExchange = this.httpServerExchange;
httpServerExchange.setRequestScheme(connection.getSslSession() != null ? "https" : "http");
this.httpServerExchange = null;
requestStateUpdater.set(this, 1);
HttpTransferEncoding.setupRequest(httpServerExchange);
if (recordRequestStartTime) {
Connectors.setRequestStartTime(httpServerExchange);
}
Connectors.executeRootHandler(connection.getRootHandler(), httpServerExchange);
} catch (Exception e) {
sendBadRequestAndClose(connection.getChannel(), e);
return;
} finally {
if (free) pooled.free();
}
}
private void handleFailedRead(ConduitStreamSourceChannel channel, int res) {
if (res == 0) {
channel.setReadListener(this);
channel.resumeReads();
} else if (res == -1) {
handleConnectionClose(channel);
}
}
private void handleConnectionClose(StreamSourceChannel channel) {
try {
channel.suspendReads();
channel.shutdownReads();
final StreamSinkChannel responseChannel = this.connection.getChannel().getSinkChannel();
responseChannel.shutdownWrites();
IoUtils.safeClose(connection);
} catch (IOException e) {
UndertowLogger.REQUEST_IO_LOGGER.debug("Error reading request", e);
// fuck it, it's all ruined
IoUtils.safeClose(connection);
}
}
private void sendBadRequestAndClose(final StreamConnection connection, final Exception exception) {
UndertowLogger.REQUEST_IO_LOGGER.failedToParseRequest(exception);
connection.getSourceChannel().suspendReads();
new StringWriteChannelListener(BAD_REQUEST) {
@Override
protected void writeDone(final StreamSinkChannel c) {
super.writeDone(c);
c.suspendWrites();
IoUtils.safeClose(connection);
}
@Override
protected void handleError(StreamSinkChannel channel, IOException e) {
IoUtils.safeClose(connection);
}
}.setup(connection.getSinkChannel());
}
public void exchangeComplete(final HttpServerExchange exchange) {
connection.clearChannel();
final HttpServerConnection connection = this.connection;
if (exchange.isPersistent() && !exchange.isUpgrade()) {
final StreamConnection channel = connection.getChannel();
if (connection.getExtraBytes() == null) {
//if we are not pipelining we just register a listener
//we have to resume from with the io thread
if (exchange.isInIoThread()) {
//no need for CAS, we are in the IO thread
newRequest();
channel.getSourceChannel().setReadListener(HttpReadListener.this);
channel.getSourceChannel().resumeReads();
requestStateUpdater.set(this, 0);
} else {
while (true) {
if (connection.getOriginalSourceConduit().isReadShutdown() || connection.getOriginalSinkConduit().isWriteShutdown()) {
channel.getSourceChannel().suspendReads();
channel.getSinkChannel().suspendWrites();
IoUtils.safeClose(connection);
return;
} else {
if (requestStateUpdater.compareAndSet(this, 1, 2)) {
newRequest();
channel.getSourceChannel().setReadListener(HttpReadListener.this);
requestStateUpdater.set(this, 0);
channel.getSourceChannel().resumeReads();
break;
}
}
}
}
} else {
if (exchange.isInIoThread()) {
requestStateUpdater.set(this, 0); //no need to CAS, as we don't actually resume
newRequest();
//no need to suspend reads here, the task will always run before the read listener anyway
channel.getIoThread().execute(this);
} else {
while (true) {
if (connection.getOriginalSinkConduit().isWriteShutdown()) {
channel.getSourceChannel().suspendReads();
channel.getSinkChannel().suspendWrites();
IoUtils.safeClose(connection);
return;
} else if (requestStateUpdater.compareAndSet(this, 1, 2)) {
newRequest();
channel.getSourceChannel().suspendReads();
requestStateUpdater.set(this, 0);
break;
}
}
Executor executor = exchange.getDispatchExecutor();
if (executor == null) {
executor = exchange.getConnection().getWorker();
}
executor.execute(this);
}
}
} else if (!exchange.isPersistent()) {
IoUtils.safeClose(connection);
} else if (exchange.isUpgrade()) {
if (connection.getExtraBytes() != null) {
connection.getChannel().getSourceChannel().setConduit(new ReadDataStreamSourceConduit(connection.getChannel().getSourceChannel().getConduit(), connection));
}
connection.getUpgradeListener().handleUpgrade(connection.getChannel(), exchange);
}
}
@Override
public void run() {
handleEvent(connection.getChannel().getSourceChannel());
}
}