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/*
* Copyright (c) 2025, 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.
*
* 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.
*/
/*
* @test
* @bug 8358764
* @summary Test closing a socket while a thread is blocked in read. The connection
* should be closed gracefuly so that the peer reads EOF.
* @run junit PeerReadsAfterAsyncClose
*/
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.SocketChannel;
import java.util.Arrays;
import java.util.Objects;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.stream.Stream;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
import static org.junit.jupiter.api.Assertions.*;
class PeerReadsAfterAsyncClose {
static Stream<ThreadFactory> factories() {
return Stream.of(Thread.ofPlatform().factory(), Thread.ofVirtual().factory());
}
/**
* Close SocketChannel while a thread is blocked reading from the channel's socket.
*/
@ParameterizedTest
@MethodSource("factories")
void testCloseDuringSocketChannelRead(ThreadFactory factory) throws Exception {
var loopback = InetAddress.getLoopbackAddress();
try (var listener = new ServerSocket()) {
listener.bind(new InetSocketAddress(loopback, 0));
try (SocketChannel sc = SocketChannel.open(listener.getLocalSocketAddress());
Socket peer = listener.accept()) {
// start thread to read from channel
var cceThrown = new AtomicBoolean();
Thread thread = factory.newThread(() -> {
try {
sc.read(ByteBuffer.allocate(1));
fail();
} catch (ClosedChannelException e) {
cceThrown.set(true);
} catch (Throwable e) {
e.printStackTrace();
}
});
thread.start();
try {
// close SocketChannel when thread sampled in implRead
onReach(thread, "sun.nio.ch.SocketChannelImpl.implRead", () -> {
try {
sc.close();
} catch (IOException ignore) { }
});
// peer should read EOF
int n = peer.getInputStream().read();
assertEquals(-1, n);
} finally {
thread.join();
}
assertEquals(true, cceThrown.get(), "ClosedChannelException not thrown");
}
}
}
/**
* Close Socket while a thread is blocked reading from the socket.
*/
@ParameterizedTest
@MethodSource("factories")
void testCloseDuringSocketUntimedRead(ThreadFactory factory) throws Exception {
testCloseDuringSocketRead(factory, 0);
}
/**
* Close Socket while a thread is blocked reading from the socket with a timeout.
*/
@ParameterizedTest
@MethodSource("factories")
void testCloseDuringSockeTimedRead(ThreadFactory factory) throws Exception {
testCloseDuringSocketRead(factory, 60_000);
}
private void testCloseDuringSocketRead(ThreadFactory factory, int timeout) throws Exception {
var loopback = InetAddress.getLoopbackAddress();
try (var listener = new ServerSocket()) {
listener.bind(new InetSocketAddress(loopback, 0));
try (Socket s = new Socket(loopback, listener.getLocalPort());
Socket peer = listener.accept()) {
// start thread to read from socket
var seThrown = new AtomicBoolean();
Thread thread = factory.newThread(() -> {
try {
s.setSoTimeout(timeout);
s.getInputStream().read();
fail();
} catch (SocketException e) {
seThrown.set(true);
} catch (Throwable e) {
e.printStackTrace();
}
});
thread.start();
try {
// close Socket when thread sampled in implRead
onReach(thread, "sun.nio.ch.NioSocketImpl.implRead", () -> {
try {
s.close();
} catch (IOException ignore) { }
});
// peer should read EOF
int n = peer.getInputStream().read();
assertEquals(-1, n);
} finally {
thread.join();
}
assertEquals(true, seThrown.get(), "SocketException not thrown");
}
}
}
/**
* Runs the given action when the given target thread is sampled at the given
* location. The location takes the form "{@code c.m}" where
* {@code c} is the fully qualified class name and {@code m} is the method name.
*/
private void onReach(Thread target, String location, Runnable action) {
int index = location.lastIndexOf('.');
String className = location.substring(0, index);
String methodName = location.substring(index + 1);
Thread.ofPlatform().daemon(true).start(() -> {
try {
boolean found = false;
while (!found) {
found = contains(target.getStackTrace(), className, methodName);
if (!found) {
Thread.sleep(20);
}
}
action.run();
} catch (Exception e) {
e.printStackTrace();
}
});
}
/**
* Returns true if the given stack trace contains an element for the given class
* and method name.
*/
private boolean contains(StackTraceElement[] stack, String className, String methodName) {
return Arrays.stream(stack)
.anyMatch(e -> className.equals(e.getClassName())
&& methodName.equals(e.getMethodName()));
}
}
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