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/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.incubator.http.internal.common;
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import java.lang.System.Logger.Level;
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import java.nio.ByteBuffer;
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import java.util.List;
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import java.util.Objects;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.Executor;
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import java.util.concurrent.Flow;
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import java.util.concurrent.atomic.AtomicReference;
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import java.util.function.Consumer;
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import javax.net.ssl.SSLEngine;
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import javax.net.ssl.SSLHandshakeException;
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import javax.net.ssl.SSLEngineResult.HandshakeStatus;
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import jdk.incubator.http.internal.common.SubscriberWrapper.SchedulingAction;
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import static javax.net.ssl.SSLEngineResult.HandshakeStatus.NOT_HANDSHAKING;
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import static javax.net.ssl.SSLEngineResult.HandshakeStatus.FINISHED;
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/**
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* An implementation of FlowTube that wraps another FlowTube in an
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* SSL flow.
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* <p>
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* The following diagram shows a typical usage of the SSLTube, where
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* the SSLTube wraps a SocketTube on the right hand side, and is connected
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* to an HttpConnection on the left hand side.
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*
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* <preformatted>{@code
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* +---------- SSLTube -------------------------+
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* | |
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* | +---SSLFlowDelegate---+ |
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* HttpConnection | | | | SocketTube
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* read sink <- SSLSubscriberW. <- Reader <- upstreamR.() <---- read source
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* (a subscriber) | | \ / | | (a publisher)
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* | | SSLEngine | |
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* HttpConnection | | / \ | | SocketTube
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* write source -> SSLSubscriptionW. -> upstreamW.() -> Writer ----> write sink
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* (a publisher) | | | | (a subscriber)
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* | +---------------------+ |
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* | |
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* +---------------------------------------------+
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* }</preformatted>
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*/
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public class SSLTube implements FlowTube {
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static final boolean DEBUG = Utils.DEBUG; // revisit: temporary developer's flag.
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final System.Logger debug =
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Utils.getDebugLogger(this::dbgString, DEBUG);
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private final FlowTube tube;
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private final SSLSubscriberWrapper readSubscriber;
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private final SSLSubscriptionWrapper writeSubscription;
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private final SSLFlowDelegate sslDelegate;
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private final SSLEngine engine;
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private volatile boolean finished;
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public SSLTube(SSLEngine engine, Executor executor, FlowTube tube) {
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Objects.requireNonNull(engine);
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Objects.requireNonNull(executor);
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this.tube = Objects.requireNonNull(tube);
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writeSubscription = new SSLSubscriptionWrapper();
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readSubscriber = new SSLSubscriberWrapper();
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this.engine = engine;
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sslDelegate = new SSLTubeFlowDelegate(engine,
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executor,
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readSubscriber,
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tube);
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}
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final class SSLTubeFlowDelegate extends SSLFlowDelegate {
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SSLTubeFlowDelegate(SSLEngine engine, Executor executor,
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SSLSubscriberWrapper readSubscriber,
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FlowTube tube) {
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super(engine, executor, readSubscriber, tube);
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}
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protected SchedulingAction enterReadScheduling() {
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readSubscriber.processPendingSubscriber();
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return SchedulingAction.CONTINUE;
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}
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void connect(Flow.Subscriber<? super List<ByteBuffer>> downReader,
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Flow.Subscriber<? super List<ByteBuffer>> downWriter) {
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assert downWriter == tube;
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assert downReader == readSubscriber;
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// Connect the read sink first. That's the left-hand side
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// downstream subscriber from the HttpConnection (or more
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// accurately, the SSLSubscriberWrapper that will wrap it
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// when SSLTube::connectFlows is called.
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reader.subscribe(downReader);
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// Connect the right hand side tube (the socket tube).
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//
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// The SSLFlowDelegate.writer publishes ByteBuffer to
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// the SocketTube for writing on the socket, and the
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// SSLFlowDelegate::upstreamReader subscribes to the
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// SocketTube to receive ByteBuffers read from the socket.
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//
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// Basically this method is equivalent to:
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// // connect the read source:
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// // subscribe the SSLFlowDelegate upstream reader
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// // to the socket tube publisher.
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// tube.subscribe(upstreamReader());
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// // connect the write sink:
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// // subscribe the socket tube write subscriber
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// // with the SSLFlowDelegate downstream writer.
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// writer.subscribe(tube);
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tube.connectFlows(FlowTube.asTubePublisher(writer),
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FlowTube.asTubeSubscriber(upstreamReader()));
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// Finally connect the write source. That's the left
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// hand side publisher which will push ByteBuffer for
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// writing and encryption to the SSLFlowDelegate.
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// The writeSubscription is in fact the SSLSubscriptionWrapper
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// that will wrap the subscription provided by the
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// HttpConnection publisher when SSLTube::connectFlows
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// is called.
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upstreamWriter().onSubscribe(writeSubscription);
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}
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}
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public CompletableFuture<String> getALPN() {
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return sslDelegate.alpn();
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}
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@Override
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public void subscribe(Flow.Subscriber<? super List<ByteBuffer>> s) {
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readSubscriber.dropSubscription();
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readSubscriber.setDelegate(s);
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s.onSubscribe(readSubscription);
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}
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/**
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* Tells whether, or not, this FlowTube has finished receiving data.
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*
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* @return true when one of this FlowTube Subscriber's OnError or onComplete
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* methods have been invoked
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*/
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@Override
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public boolean isFinished() {
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return finished;
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}
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private volatile Flow.Subscription readSubscription;
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// The DelegateWrapper wraps a subscribed {@code Flow.Subscriber} and
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// tracks the subscriber's state. In particular it makes sure that
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// onComplete/onError are not called before onSubscribed.
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final static class DelegateWrapper implements FlowTube.TubeSubscriber {
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private final FlowTube.TubeSubscriber delegate;
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private final System.Logger debug;
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volatile boolean subscribedCalled;
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volatile boolean subscribedDone;
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volatile boolean completed;
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volatile Throwable error;
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DelegateWrapper(Flow.Subscriber<? super List<ByteBuffer>> delegate,
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System.Logger debug) {
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this.delegate = FlowTube.asTubeSubscriber(delegate);
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this.debug = debug;
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}
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@Override
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public void dropSubscription() {
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if (subscribedCalled && !completed) {
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delegate.dropSubscription();
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}
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}
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@Override
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public void onNext(List<ByteBuffer> item) {
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assert subscribedCalled;
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delegate.onNext(item);
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}
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@Override
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public void onSubscribe(Flow.Subscription subscription) {
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onSubscribe(delegate::onSubscribe, subscription);
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}
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private void onSubscribe(Consumer<Flow.Subscription> method,
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Flow.Subscription subscription) {
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subscribedCalled = true;
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method.accept(subscription);
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Throwable x;
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boolean finished;
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synchronized (this) {
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subscribedDone = true;
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x = error;
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finished = completed;
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}
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if (x != null) {
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debug.log(Level.DEBUG,
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"Subscriber completed before subscribe: forwarding %s",
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(Object)x);
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delegate.onError(x);
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} else if (finished) {
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debug.log(Level.DEBUG,
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"Subscriber completed before subscribe: calling onComplete()");
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delegate.onComplete();
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}
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}
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@Override
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public void onError(Throwable t) {
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if (completed) {
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debug.log(Level.DEBUG,
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"Subscriber already completed: ignoring %s",
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(Object)t);
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return;
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}
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boolean subscribed;
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synchronized (this) {
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if (completed) return;
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error = t;
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completed = true;
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subscribed = subscribedDone;
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}
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if (subscribed) {
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delegate.onError(t);
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} else {
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debug.log(Level.DEBUG,
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"Subscriber not yet subscribed: stored %s",
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(Object)t);
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}
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}
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@Override
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public void onComplete() {
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if (completed) return;
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boolean subscribed;
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synchronized (this) {
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if (completed) return;
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completed = true;
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subscribed = subscribedDone;
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}
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if (subscribed) {
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debug.log(Level.DEBUG, "DelegateWrapper: completing subscriber");
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delegate.onComplete();
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} else {
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debug.log(Level.DEBUG,
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"Subscriber not yet subscribed: stored completed=true");
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}
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}
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@Override
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public String toString() {
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return "DelegateWrapper:" + delegate.toString();
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}
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}
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// Used to read data from the SSLTube.
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final class SSLSubscriberWrapper implements FlowTube.TubeSubscriber {
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private AtomicReference<DelegateWrapper> pendingDelegate =
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new AtomicReference<>();
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private volatile DelegateWrapper subscribed;
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private volatile boolean onCompleteReceived;
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private final AtomicReference<Throwable> errorRef
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= new AtomicReference<>();
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// setDelegate can be called asynchronously when the SSLTube flow
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// is connected. At this time the permanent subscriber (this class)
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// may already be subscribed (readSubscription != null) or not.
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// 1. If it's already subscribed (readSubscription != null), we
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// are going to signal the SSLFlowDelegate reader, and make sure
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// onSubscribed is called within the reader flow
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// 2. If it's not yet subscribed (readSubscription == null), then
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// we're going to wait for onSubscribe to be called.
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//
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void setDelegate(Flow.Subscriber<? super List<ByteBuffer>> delegate) {
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debug.log(Level.DEBUG, "SSLSubscriberWrapper (reader) got delegate: %s",
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delegate);
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assert delegate != null;
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DelegateWrapper delegateWrapper = new DelegateWrapper(delegate, debug);
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DelegateWrapper previous;
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Flow.Subscription subscription;
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boolean handleNow;
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synchronized (this) {
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previous = pendingDelegate.getAndSet(delegateWrapper);
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subscription = readSubscription;
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handleNow = this.errorRef.get() != null || finished;
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}
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if (previous != null) {
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previous.dropSubscription();
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}
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if (subscription == null) {
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debug.log(Level.DEBUG, "SSLSubscriberWrapper (reader) no subscription yet");
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return;
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}
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if (handleNow || !sslDelegate.resumeReader()) {
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processPendingSubscriber();
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}
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}
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// Can be called outside of the flow if an error has already been
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// raise. Otherwise, must be called within the SSLFlowDelegate
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// downstream reader flow.
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// If there is a subscription, and if there is a pending delegate,
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// calls dropSubscription() on the previous delegate (if any),
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// then subscribe the pending delegate.
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void processPendingSubscriber() {
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Flow.Subscription subscription;
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DelegateWrapper delegateWrapper, previous;
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synchronized (this) {
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delegateWrapper = pendingDelegate.get();
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if (delegateWrapper == null) return;
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subscription = readSubscription;
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previous = subscribed;
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}
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if (subscription == null) {
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debug.log(Level.DEBUG,
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"SSLSubscriberWrapper (reader) %s",
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"processPendingSubscriber: no subscription yet");
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return;
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}
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delegateWrapper = pendingDelegate.getAndSet(null);
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if (delegateWrapper == null) return;
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if (previous != null) {
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previous.dropSubscription();
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}
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onNewSubscription(delegateWrapper, subscription);
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}
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@Override
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public void dropSubscription() {
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DelegateWrapper subscriberImpl = subscribed;
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if (subscriberImpl != null) {
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subscriberImpl.dropSubscription();
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}
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}
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@Override
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public void onSubscribe(Flow.Subscription subscription) {
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debug.log(Level.DEBUG,
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"SSLSubscriberWrapper (reader) onSubscribe(%s)",
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subscription);
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onSubscribeImpl(subscription);
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}
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// called in the reader flow, from onSubscribe.
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private void onSubscribeImpl(Flow.Subscription subscription) {
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assert subscription != null;
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DelegateWrapper subscriberImpl, pending;
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synchronized (this) {
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readSubscription = subscription;
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subscriberImpl = subscribed;
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pending = pendingDelegate.get();
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}
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if (subscriberImpl == null && pending == null) {
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debug.log(Level.DEBUG,
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"SSLSubscriberWrapper (reader) onSubscribeImpl: %s",
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"no delegate yet");
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return;
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}
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if (pending == null) {
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// There is no pending delegate, but we have a previously
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// subscribed delegate. This is obviously a re-subscribe.
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// We are in the downstream reader flow, so we should call
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// onSubscribe directly.
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debug.log(Level.DEBUG,
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"SSLSubscriberWrapper (reader) onSubscribeImpl: %s",
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"resubscribing");
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onNewSubscription(subscriberImpl, subscription);
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} else {
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// We have some pending subscriber: subscribe it now that we have
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// a subscription. If we already had a previous delegate then
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// it will get a dropSubscription().
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debug.log(Level.DEBUG,
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"SSLSubscriberWrapper (reader) onSubscribeImpl: %s",
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"subscribing pending");
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processPendingSubscriber();
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}
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}
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private void onNewSubscription(DelegateWrapper subscriberImpl,
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Flow.Subscription subscription) {
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assert subscriberImpl != null;
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assert subscription != null;
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Throwable failed;
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boolean completed;
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// reset any demand that may have been made by the previous
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// subscriber
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sslDelegate.resetReaderDemand();
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// send the subscription to the subscriber.
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subscriberImpl.onSubscribe(subscription);
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// The following twisted logic is just here that we don't invoke
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// onError before onSubscribe. It also prevents race conditions
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// if onError is invoked concurrently with setDelegate.
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synchronized (this) {
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failed = this.errorRef.get();
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completed = finished;
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subscribed = subscriberImpl;
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}
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if (failed != null) {
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subscriberImpl.onError(failed);
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} else if (completed) {
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subscriberImpl.onComplete();
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}
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}
|
|
427 |
|
|
428 |
@Override
|
|
429 |
public void onNext(List<ByteBuffer> item) {
|
|
430 |
subscribed.onNext(item);
|
|
431 |
}
|
|
432 |
|
|
433 |
public void onErrorImpl(Throwable throwable) {
|
|
434 |
// The following twisted logic is just here that we don't invoke
|
|
435 |
// onError before onSubscribe. It also prevents race conditions
|
|
436 |
// if onError is invoked concurrently with setDelegate.
|
|
437 |
// See setDelegate.
|
|
438 |
|
|
439 |
errorRef.compareAndSet(null, throwable);
|
|
440 |
Throwable failed = errorRef.get();
|
|
441 |
finished = true;
|
|
442 |
debug.log(Level.DEBUG, "%s: onErrorImpl: %s", this, throwable);
|
|
443 |
DelegateWrapper subscriberImpl;
|
|
444 |
synchronized (this) {
|
|
445 |
subscriberImpl = subscribed;
|
|
446 |
}
|
|
447 |
if (subscriberImpl != null) {
|
|
448 |
subscriberImpl.onError(failed);
|
|
449 |
} else {
|
|
450 |
debug.log(Level.DEBUG, "%s: delegate null, stored %s", this, failed);
|
|
451 |
}
|
|
452 |
// now if we have any pending subscriber, we should forward
|
|
453 |
// the error to them immediately as the read scheduler will
|
|
454 |
// already be stopped.
|
|
455 |
processPendingSubscriber();
|
|
456 |
}
|
|
457 |
|
|
458 |
@Override
|
|
459 |
public void onError(Throwable throwable) {
|
|
460 |
assert !finished && !onCompleteReceived;
|
|
461 |
onErrorImpl(throwable);
|
|
462 |
}
|
|
463 |
|
|
464 |
private boolean handshaking() {
|
|
465 |
HandshakeStatus hs = engine.getHandshakeStatus();
|
|
466 |
return !(hs == NOT_HANDSHAKING || hs == FINISHED);
|
|
467 |
}
|
|
468 |
|
|
469 |
private boolean handshakeFailed() {
|
|
470 |
// sslDelegate can be null if we reach here
|
|
471 |
// during the initial handshake, as that happens
|
|
472 |
// within the SSLFlowDelegate constructor.
|
|
473 |
// In that case we will want to raise an exception.
|
|
474 |
return handshaking()
|
|
475 |
&& (sslDelegate == null
|
|
476 |
|| !sslDelegate.closeNotifyReceived());
|
|
477 |
}
|
|
478 |
|
|
479 |
@Override
|
|
480 |
public void onComplete() {
|
|
481 |
assert !finished && !onCompleteReceived;
|
|
482 |
onCompleteReceived = true;
|
|
483 |
DelegateWrapper subscriberImpl;
|
|
484 |
synchronized(this) {
|
|
485 |
subscriberImpl = subscribed;
|
|
486 |
}
|
|
487 |
|
|
488 |
if (handshakeFailed()) {
|
|
489 |
debug.log(Level.DEBUG,
|
|
490 |
"handshake: %s, inbound done: %s outbound done: %s",
|
|
491 |
engine.getHandshakeStatus(),
|
|
492 |
engine.isInboundDone(),
|
|
493 |
engine.isOutboundDone());
|
|
494 |
onErrorImpl(new SSLHandshakeException(
|
|
495 |
"Remote host terminated the handshake"));
|
|
496 |
} else if (subscriberImpl != null) {
|
|
497 |
finished = true;
|
|
498 |
subscriberImpl.onComplete();
|
|
499 |
}
|
|
500 |
// now if we have any pending subscriber, we should complete
|
|
501 |
// them immediately as the read scheduler will already be stopped.
|
|
502 |
processPendingSubscriber();
|
|
503 |
}
|
|
504 |
}
|
|
505 |
|
|
506 |
@Override
|
|
507 |
public void connectFlows(TubePublisher writePub,
|
|
508 |
TubeSubscriber readSub) {
|
|
509 |
debug.log(Level.DEBUG, "connecting flows");
|
|
510 |
readSubscriber.setDelegate(readSub);
|
|
511 |
writePub.subscribe(this);
|
|
512 |
}
|
|
513 |
|
|
514 |
/** Outstanding write demand from the SSL Flow Delegate. */
|
|
515 |
private final Demand writeDemand = new Demand();
|
|
516 |
|
|
517 |
final class SSLSubscriptionWrapper implements Flow.Subscription {
|
|
518 |
|
|
519 |
volatile Flow.Subscription delegate;
|
|
520 |
|
|
521 |
void setSubscription(Flow.Subscription sub) {
|
|
522 |
long demand = writeDemand.get(); // FIXME: isn't it a racy way of passing the demand?
|
|
523 |
delegate = sub;
|
|
524 |
debug.log(Level.DEBUG, "setSubscription: demand=%d", demand);
|
|
525 |
if (demand > 0)
|
|
526 |
sub.request(demand);
|
|
527 |
}
|
|
528 |
|
|
529 |
@Override
|
|
530 |
public void request(long n) {
|
|
531 |
writeDemand.increase(n);
|
|
532 |
debug.log(Level.DEBUG, "request: n=%d", n);
|
|
533 |
Flow.Subscription sub = delegate;
|
|
534 |
if (sub != null && n > 0) {
|
|
535 |
sub.request(n);
|
|
536 |
}
|
|
537 |
}
|
|
538 |
|
|
539 |
@Override
|
|
540 |
public void cancel() {
|
|
541 |
// TODO: no-op or error?
|
|
542 |
}
|
|
543 |
}
|
|
544 |
|
|
545 |
/* Subscriber - writing side */
|
|
546 |
@Override
|
|
547 |
public void onSubscribe(Flow.Subscription subscription) {
|
|
548 |
Objects.requireNonNull(subscription);
|
|
549 |
Flow.Subscription x = writeSubscription.delegate;
|
|
550 |
if (x != null)
|
|
551 |
x.cancel();
|
|
552 |
|
|
553 |
writeSubscription.setSubscription(subscription);
|
|
554 |
}
|
|
555 |
|
|
556 |
@Override
|
|
557 |
public void onNext(List<ByteBuffer> item) {
|
|
558 |
Objects.requireNonNull(item);
|
|
559 |
boolean decremented = writeDemand.tryDecrement();
|
|
560 |
assert decremented : "Unexpected writeDemand: ";
|
|
561 |
debug.log(Level.DEBUG,
|
|
562 |
"sending %d buffers to SSL flow delegate", item.size());
|
|
563 |
sslDelegate.upstreamWriter().onNext(item);
|
|
564 |
}
|
|
565 |
|
|
566 |
@Override
|
|
567 |
public void onError(Throwable throwable) {
|
|
568 |
Objects.requireNonNull(throwable);
|
|
569 |
sslDelegate.upstreamWriter().onError(throwable);
|
|
570 |
}
|
|
571 |
|
|
572 |
@Override
|
|
573 |
public void onComplete() {
|
|
574 |
sslDelegate.upstreamWriter().onComplete();
|
|
575 |
}
|
|
576 |
|
|
577 |
@Override
|
|
578 |
public String toString() {
|
|
579 |
return dbgString();
|
|
580 |
}
|
|
581 |
|
|
582 |
final String dbgString() {
|
|
583 |
return "SSLTube(" + tube + ")";
|
|
584 |
}
|
|
585 |
|
|
586 |
}
|