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PlainHttpConnection.java
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PlainHttpConnection.java
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/*
* Copyright (c) 2015, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.internal.net.http;
import java.io.IOException;
import java.net.ConnectException;
import java.net.InetSocketAddress;
import java.net.StandardSocketOptions;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.time.Duration;
import java.time.Instant;
import java.util.concurrent.CompletableFuture;
import java.util.function.Function;
import jdk.internal.net.http.common.FlowTube;
import jdk.internal.net.http.common.Log;
import jdk.internal.net.http.common.MinimalFuture;
import jdk.internal.net.http.common.Utils;
/**
* Plain raw TCP connection direct to destination.
* The connection operates in asynchronous non-blocking mode.
* All reads and writes are done non-blocking.
*/
class PlainHttpConnection extends HttpConnection {
private final Object reading = new Object();
protected final SocketChannel chan;
private final SocketTube tube; // need SocketTube to call signalClosed().
private final PlainHttpPublisher writePublisher = new PlainHttpPublisher(reading);
private volatile boolean connected;
private boolean closed;
private volatile ConnectTimerEvent connectTimerEvent; // may be null
private volatile int unsuccessfulAttempts;
// Indicates whether a connection attempt has succeeded or should be retried.
// If the attempt failed, and shouldn't be retried, there will be an exception
// instead.
private enum ConnectState { SUCCESS, RETRY }
/**
* Returns a ConnectTimerEvent iff there is a connect timeout duration,
* otherwise null.
*/
private ConnectTimerEvent newConnectTimer(Exchange<?> exchange,
CompletableFuture<?> cf) {
Duration duration = exchange.remainingConnectTimeout().orElse(null);
if (duration != null) {
ConnectTimerEvent cte = new ConnectTimerEvent(duration, exchange, cf);
return cte;
}
return null;
}
final class ConnectTimerEvent extends TimeoutEvent {
private final CompletableFuture<?> cf;
private final Exchange<?> exchange;
ConnectTimerEvent(Duration duration,
Exchange<?> exchange,
CompletableFuture<?> cf) {
super(duration);
this.exchange = exchange;
this.cf = cf;
}
@Override
public void handle() {
if (debug.on()) {
debug.log("HTTP connect timed out");
}
ConnectException ce = new ConnectException("HTTP connect timed out");
exchange.multi.cancel(ce);
client().theExecutor().execute(() -> cf.completeExceptionally(ce));
}
@Override
public String toString() {
return "ConnectTimerEvent, " + super.toString();
}
}
final class ConnectEvent extends AsyncEvent {
private final CompletableFuture<ConnectState> cf;
private final Exchange<?> exchange;
ConnectEvent(CompletableFuture<ConnectState> cf, Exchange<?> exchange) {
this.cf = cf;
this.exchange = exchange;
}
@Override
public SelectableChannel channel() {
return chan;
}
@Override
public int interestOps() {
return SelectionKey.OP_CONNECT;
}
@Override
public void handle() {
try {
assert !connected : "Already connected";
assert !chan.isBlocking() : "Unexpected blocking channel";
if (debug.on())
debug.log("ConnectEvent: finishing connect");
boolean finished = chan.finishConnect();
if (debug.on())
debug.log("ConnectEvent: connect finished: %s, cancelled: %s, Local addr: %s",
finished, exchange.multi.requestCancelled(), chan.getLocalAddress());
assert finished || exchange.multi.requestCancelled() : "Expected channel to be connected";
// complete async since the event runs on the SelectorManager thread
cf.completeAsync(() -> ConnectState.SUCCESS, client().theExecutor());
} catch (Throwable e) {
if (canRetryConnect(e)) {
unsuccessfulAttempts++;
cf.completeAsync(() -> ConnectState.RETRY, client().theExecutor());
return;
}
Throwable t = Utils.toConnectException(e);
client().theExecutor().execute( () -> cf.completeExceptionally(t));
close();
}
}
@Override
public void abort(IOException ioe) {
client().theExecutor().execute( () -> cf.completeExceptionally(ioe));
close();
}
}
@Override
public CompletableFuture<Void> connectAsync(Exchange<?> exchange) {
CompletableFuture<ConnectState> cf = new MinimalFuture<>();
try {
assert !connected : "Already connected";
assert !chan.isBlocking() : "Unexpected blocking channel";
boolean finished;
if (connectTimerEvent == null) {
connectTimerEvent = newConnectTimer(exchange, cf);
if (connectTimerEvent != null) {
if (debug.on())
debug.log("registering connect timer: " + connectTimerEvent);
client().registerTimer(connectTimerEvent);
}
}
PrivilegedExceptionAction<Boolean> pa =
() -> chan.connect(Utils.resolveAddress(address));
try {
finished = AccessController.doPrivileged(pa);
} catch (PrivilegedActionException e) {
throw e.getCause();
}
if (finished) {
if (debug.on()) debug.log("connect finished without blocking");
cf.complete(ConnectState.SUCCESS);
} else {
if (debug.on()) debug.log("registering connect event");
client().registerEvent(new ConnectEvent(cf, exchange));
}
cf = exchange.checkCancelled(cf, this);
} catch (Throwable throwable) {
cf.completeExceptionally(Utils.toConnectException(throwable));
try {
close();
} catch (Exception x) {
if (debug.on())
debug.log("Failed to close channel after unsuccessful connect");
}
}
return cf.handle((r,t) -> checkRetryConnect(r, t,exchange))
.thenCompose(Function.identity());
}
/**
* On some platforms, a ConnectEvent may be raised and a ConnectionException
* may occur with the message "Connection timed out: no further information"
* before our actual connection timeout has expired. In this case, this
* method will be called with a {@code connect} state of {@code ConnectState.RETRY)}
* and we will retry once again.
* @param connect indicates whether the connection was successful or should be retried
* @param failed the failure if the connection failed
* @param exchange the exchange
* @return a completable future that will take care of retrying the connection if needed.
*/
private CompletableFuture<Void> checkRetryConnect(ConnectState connect, Throwable failed, Exchange<?> exchange) {
// first check if the connection failed
if (failed != null) return MinimalFuture.failedFuture(failed);
// then check if the connection should be retried
if (connect == ConnectState.RETRY) {
int attempts = unsuccessfulAttempts;
assert attempts <= 1;
if (debug.on())
debug.log("Retrying connect after %d attempts", attempts);
return connectAsync(exchange);
}
// Otherwise, the connection was successful;
assert connect == ConnectState.SUCCESS;
return MinimalFuture.completedFuture(null);
}
private boolean canRetryConnect(Throwable e) {
if (!MultiExchange.RETRY_CONNECT) return false;
if (!(e instanceof ConnectException)) return false;
if (unsuccessfulAttempts > 0) return false;
ConnectTimerEvent timer = connectTimerEvent;
if (timer == null) return true;
return timer.deadline().isAfter(Instant.now());
}
@Override
public CompletableFuture<Void> finishConnect() {
assert connected == false;
if (debug.on()) debug.log("finishConnect, setting connected=true");
connected = true;
if (connectTimerEvent != null)
client().cancelTimer(connectTimerEvent);
return MinimalFuture.completedFuture(null);
}
@Override
SocketChannel channel() {
return chan;
}
@Override
final FlowTube getConnectionFlow() {
return tube;
}
PlainHttpConnection(InetSocketAddress addr, HttpClientImpl client) {
super(addr, client);
try {
this.chan = SocketChannel.open();
chan.configureBlocking(false);
if (debug.on()) {
int bufsize = getSoReceiveBufferSize();
debug.log("Initial receive buffer size is: %d", bufsize);
bufsize = getSoSendBufferSize();
debug.log("Initial send buffer size is: %d", bufsize);
}
if (trySetReceiveBufferSize(client.getReceiveBufferSize())) {
if (debug.on()) {
int bufsize = getSoReceiveBufferSize();
debug.log("Receive buffer size configured: %d", bufsize);
}
}
if (trySetSendBufferSize(client.getSendBufferSize())) {
if (debug.on()) {
int bufsize = getSoSendBufferSize();
debug.log("Send buffer size configured: %d", bufsize);
}
}
chan.setOption(StandardSocketOptions.TCP_NODELAY, true);
// wrap the channel in a Tube for async reading and writing
tube = new SocketTube(client(), chan, Utils::getBuffer);
} catch (IOException e) {
throw new InternalError(e);
}
}
private int getSoReceiveBufferSize() {
try {
return chan.getOption(StandardSocketOptions.SO_RCVBUF);
} catch (IOException x) {
if (debug.on())
debug.log("Failed to get initial receive buffer size on %s", chan);
}
return 0;
}
private int getSoSendBufferSize() {
try {
return chan.getOption(StandardSocketOptions.SO_SNDBUF);
} catch (IOException x) {
if (debug.on())
debug.log("Failed to get initial receive buffer size on %s", chan);
}
return 0;
}
private boolean trySetReceiveBufferSize(int bufsize) {
try {
if (bufsize > 0) {
chan.setOption(StandardSocketOptions.SO_RCVBUF, bufsize);
return true;
}
} catch (IOException x) {
if (debug.on())
debug.log("Failed to set receive buffer size to %d on %s",
bufsize, chan);
}
return false;
}
private boolean trySetSendBufferSize(int bufsize) {
try {
if (bufsize > 0) {
chan.setOption(StandardSocketOptions.SO_SNDBUF, bufsize);
return true;
}
} catch (IOException x) {
if (debug.on())
debug.log("Failed to set send buffer size to %d on %s",
bufsize, chan);
}
return false;
}
@Override
HttpPublisher publisher() { return writePublisher; }
@Override
public String toString() {
return "PlainHttpConnection: " + super.toString();
}
/**
* Closes this connection
*/
@Override
public void close() {
synchronized (this) {
if (closed) {
return;
}
closed = true;
}
try {
Log.logTrace("Closing: " + toString());
if (debug.on())
debug.log("Closing channel: " + client().debugInterestOps(chan));
if (connectTimerEvent != null)
client().cancelTimer(connectTimerEvent);
chan.close();
tube.signalClosed();
} catch (IOException e) {
Log.logTrace("Closing resulted in " + e);
}
}
@Override
ConnectionPool.CacheKey cacheKey() {
return new ConnectionPool.CacheKey(address, null);
}
@Override
synchronized boolean connected() {
return connected;
}
@Override
boolean isSecure() {
return false;
}
@Override
boolean isProxied() {
return false;
}
@Override
InetSocketAddress proxy() {
return null;
}
}