Fix a regression in SslHandler where delegated tasks run in a different executor makes the session hang

- Fixes #2098
- Deprecate specifying an alternative Executor for delegated tasks for SslHandler

handler/src/main/java/io/netty/handler/ssl/SslHandler.java

@@ -51,8 +51,10 @@ import java.nio.channels.ClosedChannelException;
 import java.nio.channels.DatagramChannel;
 import java.nio.channels.SocketChannel;
 import java.util.ArrayDeque;
+import java.util.ArrayList;
 import java.util.Deque;
 import java.util.List;
+import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
 import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.TimeUnit;
@@ -204,7 +206,7 @@ public class SslHandler extends ByteToMessageDecoder {
      * @param engine  the {@link SSLEngine} this handler will use
      */
     public SslHandler(SSLEngine engine) {
-        this(engine, ImmediateExecutor.INSTANCE);
+        this(engine, false);
     }
 
     /**
@@ -214,35 +216,23 @@ public class SslHandler extends ByteToMessageDecoder {
      * @param startTls  {@code true} if the first write request shouldn't be
      *                  encrypted by the {@link SSLEngine}
      */
+    @SuppressWarnings("deprecation")
     public SslHandler(SSLEngine engine, boolean startTls) {
         this(engine, startTls, ImmediateExecutor.INSTANCE);
     }
 
     /**
-     * Creates a new instance.
+     * @deprecated Use {@link #SslHandler(SSLEngine)} instead.
-     *
-     * @param engine
-     *        the {@link SSLEngine} this handler will use
-     * @param delegatedTaskExecutor
-     *        the {@link Executor} which will execute the delegated task
-     *        that {@link SSLEngine#getDelegatedTask()} will return
      */
+    @Deprecated
     public SslHandler(SSLEngine engine, Executor delegatedTaskExecutor) {
         this(engine, false, delegatedTaskExecutor);
     }
 
     /**
-     * Creates a new instance.
+     * @deprecated Use {@link #SslHandler(SSLEngine, boolean)} instead.
-     *
-     * @param engine
-     *        the {@link SSLEngine} this handler will use
-     * @param startTls
-     *        {@code true} if the first write request shouldn't be encrypted
-     *        by the {@link SSLEngine}
-     * @param delegatedTaskExecutor
-     *        the {@link Executor} which will execute the delegated task
-     *        that {@link SSLEngine#getDelegatedTask()} will return
      */
+    @Deprecated
     public SslHandler(SSLEngine engine, boolean startTls, Executor delegatedTaskExecutor) {
         if (engine == null) {
             throw new NullPointerException("engine");
@@ -947,14 +937,66 @@ public class SslHandler extends ByteToMessageDecoder {
         }
     }
 
+    /**
+     * Fetches all delegated tasks from the {@link SSLEngine} and runs them via the {@link #delegatedTaskExecutor}.
+     * If the {@link #delegatedTaskExecutor} is {@link ImmediateExecutor}, just call {@link Runnable#run()} directly
+     * instead of using {@link Executor#execute(Runnable)}.  Otherwise, run the tasks via
+     * the {@link #delegatedTaskExecutor} and wait until the tasks are finished.
+     */
     private void runDelegatedTasks() {
-        for (;;) {
+        if (delegatedTaskExecutor == ImmediateExecutor.INSTANCE) {
-            Runnable task = engine.getDelegatedTask();
+            for (;;) {
-            if (task == null) {
+                Runnable task = engine.getDelegatedTask();
-                break;
+                if (task == null) {
+                    break;
+                }
+
+                task.run();
+            }
+        } else {
+            final List<Runnable> tasks = new ArrayList<Runnable>(2);
+            for (;;) {
+                final Runnable task = engine.getDelegatedTask();
+                if (task == null) {
+                    break;
+                }
+
+                tasks.add(task);
             }
 
-            delegatedTaskExecutor.execute(task);
+            if (tasks.isEmpty()) {
+                return;
+            }
+
+            final CountDownLatch latch = new CountDownLatch(1);
+            delegatedTaskExecutor.execute(new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        for (Runnable task: tasks) {
+                            task.run();
+                        }
+                    } catch (Exception e) {
+                        ctx.fireExceptionCaught(e);
+                    } finally {
+                        latch.countDown();
+                    }
+                }
+            });
+
+            boolean interrupted = false;
+            while (latch.getCount() != 0) {
+                try {
+                    latch.await();
+                } catch (InterruptedException e) {
+                    // Interrupt later.
+                    interrupted = true;
+                }
+            }
+
+            if (interrupted) {
+                Thread.currentThread().interrupt();
+            }
         }
     }
 

testsuite/src/test/java/io/netty/testsuite/transport/socket/AbstractSocketTest.java

@@ -70,8 +70,11 @@ public abstract class AbstractSocketTest {
                         "Running: %s %d of %d (%s + %s) with %s",
                         testName.getMethodName(), ++ i, COMBO.size(), sb, cb, StringUtil.simpleClassName(allocator)));
                 try {
-                    Method m = getClass().getDeclaredMethod(
+                    String testMethodName = testName.getMethodName();
-                            testName.getMethodName(), ServerBootstrap.class, Bootstrap.class);
+                    if (testMethodName.contains("[")) {
+                        testMethodName = testMethodName.substring(0, testMethodName.indexOf('['));
+                    }
+                    Method m = getClass().getDeclaredMethod(testMethodName, ServerBootstrap.class, Bootstrap.class);
                     m.invoke(this, sb, cb);
                 } catch (InvocationTargetException ex) {
                     throw ex.getCause();

testsuite/src/test/java/io/netty/testsuite/transport/socket/SocketSslEchoTest.java

@@ -30,15 +30,24 @@ import io.netty.handler.stream.ChunkedWriteHandler;
 import io.netty.testsuite.util.BogusSslContextFactory;
 import io.netty.util.concurrent.Future;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
 
 import javax.net.ssl.SSLEngine;
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
 import java.util.Random;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
 
 import static org.junit.Assert.*;
 
+@RunWith(Parameterized.class)
 public class SocketSslEchoTest extends AbstractSocketTest {
 
     private static final int FIRST_MESSAGE_SIZE = 16384;
@@ -49,46 +58,42 @@ public class SocketSslEchoTest extends AbstractSocketTest {
         random.nextBytes(data);
     }
 
+    @Parameters(name = "{index}: " +
+            "serverUsesDelegatedTaskExecutor = {0}, clientUsesDelegatedTaskExecutor = {1}, " +
+            "useChunkedWriteHandler = {2}, useCompositeByteBuf = {3}")
+    public static Collection<Object[]> data() {
+        List<Object[]> params = new ArrayList<Object[]>();
+        for (int i = 0; i < 16; i ++) {
+            params.add(new Object[] {
+                    (i & 8) != 0, (i & 4) != 0, (i & 2) != 0, (i & 1) != 0
+            });
+        }
+        return params;
+    }
+
+    private final boolean serverUsesDelegatedTaskExecutor;
+    private final boolean clientUsesDelegatedTaskExecutor;
+    private final boolean useChunkedWriteHandler;
+    private final boolean useCompositeByteBuf;
+
+    public SocketSslEchoTest(
+            boolean serverUsesDelegatedTaskExecutor, boolean clientUsesDelegatedTaskExecutor,
+            boolean useChunkedWriteHandler, boolean useCompositeByteBuf) {
+        this.serverUsesDelegatedTaskExecutor = serverUsesDelegatedTaskExecutor;
+        this.clientUsesDelegatedTaskExecutor = clientUsesDelegatedTaskExecutor;
+        this.useChunkedWriteHandler = useChunkedWriteHandler;
+        this.useCompositeByteBuf = useCompositeByteBuf;
+    }
+
     @Test
     public void testSslEcho() throws Throwable {
         run();
     }
 
     public void testSslEcho(ServerBootstrap sb, Bootstrap cb) throws Throwable {
-        testSslEcho0(sb, cb, false, false);
+        final ExecutorService delegatedTaskExecutor = Executors.newCachedThreadPool();
-    }
+        final EchoHandler sh = new EchoHandler(true, useCompositeByteBuf);
-
+        final EchoHandler ch = new EchoHandler(false, useCompositeByteBuf);
-    @Test
-    public void testSslEchoComposite() throws Throwable {
-        run();
-    }
-
-    public void testSslEchoComposite(ServerBootstrap sb, Bootstrap cb) throws Throwable {
-        testSslEcho0(sb, cb, false, true);
-    }
-
-    @Test
-    public void testSslEchoWithChunkHandler() throws Throwable {
-        run();
-    }
-
-    public void testSslEchoWithChunkHandler(ServerBootstrap sb, Bootstrap cb) throws Throwable {
-        testSslEcho0(sb, cb, true, false);
-    }
-
-    @Test
-    public void testSslEchoWithChunkHandlerComposite() throws Throwable {
-        run();
-    }
-
-    public void testSslEchoWithChunkHandlerComposite(ServerBootstrap sb, Bootstrap cb) throws Throwable {
-        testSslEcho0(sb, cb, true, true);
-    }
-
-    private void testSslEcho0(ServerBootstrap sb, Bootstrap cb,
-                              final boolean chunkWriteHandler, final boolean composite) throws Throwable {
-        final EchoHandler sh = new EchoHandler(true, composite);
-        final EchoHandler ch = new EchoHandler(false, composite);
 
         final SSLEngine sse = BogusSslContextFactory.getServerContext().createSSLEngine();
         final SSLEngine cse = BogusSslContextFactory.getClientContext().createSSLEngine();
@@ -97,9 +102,14 @@ public class SocketSslEchoTest extends AbstractSocketTest {
 
         sb.childHandler(new ChannelInitializer<SocketChannel>() {
             @Override
+            @SuppressWarnings("deprecation")
             public void initChannel(SocketChannel sch) throws Exception {
-                sch.pipeline().addFirst("ssl", new SslHandler(sse));
+                if (serverUsesDelegatedTaskExecutor) {
-                if (chunkWriteHandler) {
+                    sch.pipeline().addFirst("ssl", new SslHandler(sse, delegatedTaskExecutor));
+                } else {
+                    sch.pipeline().addFirst("ssl", new SslHandler(sse));
+                }
+                if (useChunkedWriteHandler) {
                     sch.pipeline().addLast(new ChunkedWriteHandler());
                 }
                 sch.pipeline().addLast("handler", sh);
@@ -108,9 +118,14 @@ public class SocketSslEchoTest extends AbstractSocketTest {
 
         cb.handler(new ChannelInitializer<SocketChannel>() {
             @Override
+            @SuppressWarnings("deprecation")
             public void initChannel(SocketChannel sch) throws Exception {
-                sch.pipeline().addFirst("ssl", new SslHandler(cse));
+                if (clientUsesDelegatedTaskExecutor) {
-                if (chunkWriteHandler) {
+                    sch.pipeline().addFirst("ssl", new SslHandler(cse, delegatedTaskExecutor));
+                } else {
+                    sch.pipeline().addFirst("ssl", new SslHandler(cse));
+                }
+                if (useChunkedWriteHandler) {
                     sch.pipeline().addLast(new ChunkedWriteHandler());
                 }
                 sch.pipeline().addLast("handler", ch);
@@ -130,7 +145,7 @@ public class SocketSslEchoTest extends AbstractSocketTest {
         for (int i = FIRST_MESSAGE_SIZE; i < data.length;) {
             int length = Math.min(random.nextInt(1024 * 64), data.length - i);
             ByteBuf buf = Unpooled.wrappedBuffer(data, i, length);
-            if (composite) {
+            if (useCompositeByteBuf) {
                 buf = Unpooled.compositeBuffer().addComponent(buf).writerIndex(buf.writerIndex());
             }
             ChannelFuture future = cc.writeAndFlush(buf);
@@ -171,6 +186,7 @@ public class SocketSslEchoTest extends AbstractSocketTest {
         sh.channel.close().awaitUninterruptibly();
         ch.channel.close().awaitUninterruptibly();
         sc.close().awaitUninterruptibly();
+        delegatedTaskExecutor.shutdown();
 
         if (sh.exception.get() != null && !(sh.exception.get() instanceof IOException)) {
             throw sh.exception.get();