org.wildfly.httpclient.common.HttpConnectionPool Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2017 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 org.wildfly.httpclient.common;
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.UndertowClient;
import io.undertow.connector.ByteBufferPool;
import io.undertow.protocols.ssl.UndertowXnioSsl;
import org.xnio.ChannelListener;
import org.xnio.IoUtils;
import org.xnio.OptionMap;
import org.xnio.XnioExecutor;
import org.xnio.XnioWorker;
import javax.net.ssl.SSLContext;
import java.io.Closeable;
import java.io.IOException;
import java.net.InetAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedDeque;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
/**
* A pool of HTTP connections for a given host pool.
*
* @author Stuart Douglas
* @author Flavia Rainone
*/
public class HttpConnectionPool implements Closeable {
private final int maxConnections;
private final int maxStreamsPerConnection;
private final XnioWorker worker;
private final ByteBufferPool byteBufferPool;
private final OptionMap options;
private final HostPool hostPool;
private final long connectionIdleTimeout;
private final Map> connections = new ConcurrentHashMap<>();
private final ConcurrentLinkedDeque pendingConnectionRequests = new ConcurrentLinkedDeque<>();
private final AtomicInteger activeInvocationCount = new AtomicInteger();
private final Map sslInstances = new ConcurrentHashMap<>();
private final Object NULL_SSL_CONTEXT = new Object();
private final PoolAuthenticationContext poolAuthenticationContext = new PoolAuthenticationContext();
public HttpConnectionPool(int maxConnections, int maxStreamsPerConnection, XnioWorker worker, ByteBufferPool byteBufferPool, OptionMap options, HostPool hostPool, long connectionIdleTimeout) {
this.maxConnections = maxConnections;
this.maxStreamsPerConnection = maxStreamsPerConnection;
this.worker = worker;
this.byteBufferPool = byteBufferPool;
this.hostPool = hostPool;
this.connectionIdleTimeout = connectionIdleTimeout;
final String hostname = hostPool.getUri().getHost();
if ("https".equals(hostPool.getUri().getScheme()) && hostname != null) {
try {
final InetAddress address = hostPool.getAddress().getAddress();
if (address.toString().charAt(0) != '/') {
// address not starting with / means hostname used, add the SNI option
options = OptionMap.builder().addAll(options).set(UndertowOptions.SSL_SNI_HOSTNAME, hostname).getMap();
}
} catch (UnknownHostException e) {
// if exception the URI contains a hostname
options = OptionMap.builder().addAll(options).set(UndertowOptions.SSL_SNI_HOSTNAME, hostname).getMap();
}
}
this.options = options;
}
public void getConnection(ConnectionListener connectionListener, ErrorListener errorListener, boolean ignoreConnectionLimits, SSLContext sslContext) {
pendingConnectionRequests.add(new RequestHolder(connectionListener, errorListener, ignoreConnectionLimits, sslContext));
runPending();
}
public void returnConnection(ClientConnectionHolder connection) {
activeInvocationCount.decrementAndGet();
if (connection.getConnection().isOpen()) {
connections.get(connection.sslContext == null ? NULL_SSL_CONTEXT : connection.sslContext).add(connection);
}
runPending();
}
protected ClientConnectionHolder createClientConnectionHolder(ClientConnection connection, URI uri, SSLContext sslContext) {
return new ClientConnectionHolder(connection, uri, sslContext);
}
int getProtocolVersion() {
return Protocol.LATEST;
}
private void runPending() {
int count;
do {
count = activeInvocationCount.get();
if (count == maxConnections) {
return;
}
} while (!activeInvocationCount.compareAndSet(count, count + 1));
RequestHolder next = pendingConnectionRequests.poll();
if (next == null) {
activeInvocationCount.decrementAndGet();
return;
}
SSLContext sslContext = null;
UndertowXnioSsl ssl = null;
if (hostPool.getUri().getScheme().equals("https")) {
sslContext = next.context;
if (sslContext != null) {
ssl = sslInstances.get(sslContext);
if (ssl == null) {
sslInstances.put(sslContext, ssl = new UndertowXnioSsl(worker.getXnio(), OptionMap.EMPTY, sslContext));
}
}
}
Object key = sslContext == null ? NULL_SSL_CONTEXT : sslContext;
ConcurrentLinkedDeque queue = connections.get(key);
if (queue == null) {
connections.putIfAbsent(key, new ConcurrentLinkedDeque<>());
queue = connections.get(key);
}
for (; ; ) {
ClientConnectionHolder existingConnection = queue.poll();
if (existingConnection == null) {
break;
}
if(!existingConnection.connection.isOpen()) {
continue;
}
if (existingConnection.tryAcquire()) {
next.connectionListener.done(existingConnection);
return;
}
}
HostPool.AddressResult hostPoolAddress = hostPool.getAddress();
InetAddress address;
try {
address = hostPoolAddress.getAddress();
} catch (UnknownHostException e) {
next.errorListener.error(e);
return;
}
try {
final SSLContext context = sslContext;
UndertowClient.getInstance().connect(new ClientCallback() {
@Override
public void completed(ClientConnection result) {
result.getCloseSetter().set((ChannelListener) connections::remove);
ClientConnectionHolder clientConnectionHolder = createClientConnectionHolder(result, hostPoolAddress.getURI(), context);
clientConnectionHolder.tryAcquire(); //aways suceeds
next.connectionListener.done(clientConnectionHolder);
}
@Override
public void failed(IOException e) {
hostPoolAddress.failed(); //notify the host pool that this host has failed
activeInvocationCount.decrementAndGet();
next.errorListener.error(e);
}
}, new URI(hostPoolAddress.getURI().getScheme(), hostPoolAddress.getURI().getUserInfo(), address.getHostAddress(), hostPoolAddress.getURI().getPort(), "/", null, null), worker, ssl, byteBufferPool, options);
} catch (URISyntaxException e) {
next.errorListener.error(e);
}
}
@Override
public void close() throws IOException {
//TODO
}
public interface ConnectionListener {
void done(ConnectionHandle connection);
}
public interface ErrorListener {
void error(Exception e);
}
public interface ConnectionHandle {
ClientConnection getConnection();
void done(boolean close);
URI getUri();
PoolAuthenticationContext getAuthenticationContext();
void sendRequest(ClientRequest request, ClientCallback callback);
}
private static class RequestHolder {
final ConnectionListener connectionListener;
final ErrorListener errorListener;
final boolean ignoreConnectionLimits;
final SSLContext context;
private RequestHolder(ConnectionListener connectionListener, ErrorListener errorListener, boolean ignoreConnectionLimits, SSLContext context) {
this.connectionListener = connectionListener;
this.errorListener = errorListener;
this.ignoreConnectionLimits = ignoreConnectionLimits;
this.context = context;
}
}
protected class ClientConnectionHolder implements ConnectionHandle {
private volatile AtomicInteger state = new AtomicInteger();
private final ClientConnection connection;
private final URI uri;
private volatile XnioExecutor.Key timeoutKey;
private long timeout;
private final SSLContext sslContext;
// keep track if the connection is in use (!IN_USE = idle)
private static final int IN_USE = 1;
// indicate this connection is closed
private static final int CLOSED = 1 << 1;
private final Runnable timeoutTask = new Runnable() {
@Override
public void run() {
timeoutKey = null;
if (hasFlags(CLOSED)) {
return;
}
long time = System.currentTimeMillis();
if (timeout > time) {
timeoutKey = connection.getIoThread().executeAfter(this, timeout - time, TimeUnit.MILLISECONDS);
return;
}
if (tryClose()) {
activeInvocationCount.decrementAndGet();
runPending(); //needed to avoid a very unlikely race
}
}
};
ClientConnectionHolder(ClientConnection connection, URI uri, SSLContext sslContext) {
this.connection = connection;
this.uri = uri;
this.sslContext = sslContext;
}
final boolean tryClose() {
if (setFlagsIfCleared(CLOSED, IN_USE)) {
IoUtils.safeClose(connection);
return true;
}
return false;
}
final boolean tryAcquire() {
return setFlagsIfCleared(IN_USE, CLOSED);
}
@Override
public ClientConnection getConnection() {
return connection;
}
@Override
public void done(boolean close) {
if (!clearFlags(IN_USE)) {
return;
}
if (close) {
IoUtils.safeClose(connection);
}
timeout = System.currentTimeMillis() + connectionIdleTimeout;
if (timeoutKey == null && connectionIdleTimeout > 0 && !close) {
timeoutKey = connection.getIoThread().executeAfter(timeoutTask, connectionIdleTimeout, TimeUnit.MILLISECONDS);
}
returnConnection(this);
}
@Override
public URI getUri() {
return uri;
}
@Override
public PoolAuthenticationContext getAuthenticationContext() {
return poolAuthenticationContext;
}
@Override
public void sendRequest(ClientRequest request, ClientCallback callback) {
connection.sendRequest(request, callback);
}
protected final void setFlags(int flags) {
int oldState;
do {
oldState = state.get();
if ((oldState & flags) == flags || (oldState & CLOSED) == CLOSED) {
return;
}
} while (! state.compareAndSet(oldState, oldState | flags));
}
protected final boolean setFlagsIfCleared(int flags, int clearedFlags) {
int oldState;
do {
oldState = state.get();
if ((oldState & flags) == flags || (oldState & clearedFlags) == clearedFlags) {
return false;
}
} while (! state.compareAndSet(oldState, oldState | flags));
return true;
}
protected final boolean clearFlags(int flags) {
int oldState;
do {
oldState = state.get();
if ((oldState & flags) == 0) {
return false;
}
} while (! state.compareAndSet(oldState, oldState & ~flags));
return true;
}
protected final boolean hasFlags(int flags) {
return (state.get() & flags) == flags;
}
}
}