netty: Fix ByteBuf leaks in tests (#11593)

Part of #3353

netty/src/test/java/io/grpc/netty/NettyClientHandlerTest.java

@@ -217,6 +217,7 @@ public class NettyClientHandlerTest extends NettyHandlerTestBase<NettyClientHand
     // Simulate receipt of initial remote settings.
     ByteBuf serializedSettings = serializeSettings(new Http2Settings());
     channelRead(serializedSettings);
+    channel().releaseOutbound();
   }
 
   @Test
@@ -342,11 +343,12 @@ public class NettyClientHandlerTest extends NettyHandlerTestBase<NettyClientHand
     createStream();
 
     // Send a frame and verify that it was written.
+    ByteBuf content = content();
     ChannelFuture future
-        = enqueue(new SendGrpcFrameCommand(streamTransportState, content(), true));
+        = enqueue(new SendGrpcFrameCommand(streamTransportState, content, true));
 
     assertTrue(future.isSuccess());
-    verifyWrite().writeData(eq(ctx()), eq(STREAM_ID), eq(content()), eq(0), eq(true),
+    verifyWrite().writeData(eq(ctx()), eq(STREAM_ID), same(content), eq(0), eq(true),
         any(ChannelPromise.class));
     verify(mockKeepAliveManager, times(1)).onTransportActive(); // onStreamActive
     verifyNoMoreInteractions(mockKeepAliveManager);

netty/src/test/java/io/grpc/netty/NettyHandlerTestBase.java

@@ -38,7 +38,6 @@ import io.grpc.internal.TransportTracer;
 import io.grpc.internal.WritableBuffer;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufAllocator;
-import io.netty.buffer.ByteBufUtil;
 import io.netty.buffer.CompositeByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.buffer.UnpooledByteBufAllocator;
@@ -68,6 +67,7 @@ import java.io.ByteArrayInputStream;
 import java.nio.ByteBuffer;
 import java.util.concurrent.Delayed;
 import java.util.concurrent.TimeUnit;
+import org.junit.After;
 import org.junit.Assert;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -84,7 +84,6 @@ import org.mockito.verification.VerificationMode;
 public abstract class NettyHandlerTestBase<T extends Http2ConnectionHandler> {
 
   protected static final int STREAM_ID = 3;
-  private ByteBuf content;
 
   private EmbeddedChannel channel;
 
@@ -106,18 +105,24 @@ public abstract class NettyHandlerTestBase<T extends Http2ConnectionHandler> {
   protected final TransportTracer transportTracer = new TransportTracer();
   protected int flowControlWindow = DEFAULT_WINDOW_SIZE;
   protected boolean autoFlowControl = false;
-
   private final FakeClock fakeClock = new FakeClock();
 
   FakeClock fakeClock() {
     return fakeClock;
   }
 
+  @After
+  public void tearDown() throws Exception {
+    if (channel() != null) {
+      channel().releaseInbound();
+      channel().releaseOutbound();
+    }
+  }
+
   /**
    * Must be called by subclasses to initialize the handler and channel.
    */
   protected final void initChannel(Http2HeadersDecoder headersDecoder) throws Exception {
-    content = Unpooled.copiedBuffer("hello world", UTF_8);
     frameWriter = mock(Http2FrameWriter.class, delegatesTo(new DefaultHttp2FrameWriter()));
     frameReader = new DefaultHttp2FrameReader(headersDecoder);
 
@@ -233,11 +238,11 @@ public abstract class NettyHandlerTestBase<T extends Http2ConnectionHandler> {
   }
 
   protected final ByteBuf content() {
-    return content;
+    return Unpooled.copiedBuffer(contentAsArray());
   }
 
   protected final byte[] contentAsArray() {
-    return ByteBufUtil.getBytes(content());
+    return "\000\000\000\000\rhello world".getBytes(UTF_8);
   }
 
   protected final Http2FrameWriter verifyWrite() {
@@ -252,8 +257,8 @@ public abstract class NettyHandlerTestBase<T extends Http2ConnectionHandler> {
     channel.writeInbound(obj);
   }
 
-  protected ByteBuf grpcDataFrame(int streamId, boolean endStream, byte[] content) {
+  protected ByteBuf grpcFrame(byte[] message) {
-    final ByteBuf compressionFrame = Unpooled.buffer(content.length);
+    final ByteBuf compressionFrame = Unpooled.buffer(message.length);
     MessageFramer framer = new MessageFramer(
         new MessageFramer.Sink() {
           @Override
@@ -262,23 +267,22 @@ public abstract class NettyHandlerTestBase<T extends Http2ConnectionHandler> {
             if (frame != null) {
               ByteBuf bytebuf = ((NettyWritableBuffer) frame).bytebuf();
               compressionFrame.writeBytes(bytebuf);
+              bytebuf.release();
             }
           }
         },
         new NettyWritableBufferAllocator(ByteBufAllocator.DEFAULT),
         StatsTraceContext.NOOP);
-    framer.writePayload(new ByteArrayInputStream(content));
+    framer.writePayload(new ByteArrayInputStream(message));
-    framer.flush();
+    framer.close();
-    ChannelHandlerContext ctx = newMockContext();
+    return compressionFrame;
-    new DefaultHttp2FrameWriter().writeData(ctx, streamId, compressionFrame, 0, endStream,
+  }
-        newPromise());
+
-    return captureWrite(ctx);
+  protected final ByteBuf grpcDataFrame(int streamId, boolean endStream, byte[] content) {
+    return dataFrame(streamId, endStream, grpcFrame(content));
   }
 
   protected final ByteBuf dataFrame(int streamId, boolean endStream, ByteBuf content) {
-    // Need to retain the content since the frameWriter releases it.
-    content.retain();
-
     ChannelHandlerContext ctx = newMockContext();
     new DefaultHttp2FrameWriter().writeData(ctx, streamId, content, 0, endStream, newPromise());
     return captureWrite(ctx);
@@ -410,6 +414,7 @@ public abstract class NettyHandlerTestBase<T extends Http2ConnectionHandler> {
     channelRead(dataFrame(3, false, buff.copy()));
 
     assertEquals(length * 3, handler.flowControlPing().getDataSincePing());
+    buff.release();
   }
 
   @Test
@@ -608,12 +613,14 @@ public abstract class NettyHandlerTestBase<T extends Http2ConnectionHandler> {
 
   private void readPingAck(long pingData) throws Exception {
     channelRead(pingFrame(true, pingData));
+    channel().releaseOutbound();
   }
 
   private void readXCopies(int copies, byte[] data) throws Exception {
     for (int i = 0; i < copies; i++) {
       channelRead(grpcDataFrame(STREAM_ID, false, data)); // buffer it
       stream().request(1); // consume it
+      channel().releaseOutbound();
     }
   }
 

netty/src/test/java/io/grpc/netty/NettyServerHandlerTest.java

@@ -43,6 +43,7 @@ import static org.mockito.ArgumentMatchers.anyLong;
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.ArgumentMatchers.isA;
+import static org.mockito.ArgumentMatchers.same;
 import static org.mockito.Mockito.atLeastOnce;
 import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.doThrow;
@@ -74,7 +75,6 @@ import io.grpc.internal.StreamListener;
 import io.grpc.internal.testing.TestServerStreamTracer;
 import io.grpc.netty.GrpcHttp2HeadersUtils.GrpcHttp2ServerHeadersDecoder;
 import io.netty.buffer.ByteBuf;
-import io.netty.buffer.ByteBufUtil;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelPromise;
@@ -120,23 +120,16 @@ public class NettyServerHandlerTest extends NettyHandlerTestBase<NettyServerHand
   public final TestRule globalTimeout = new DisableOnDebug(Timeout.seconds(10));
   @Rule
   public final MockitoRule mocks = MockitoJUnit.rule();
-
   private static final AsciiString HTTP_FAKE_METHOD = AsciiString.of("FAKE");
-
-
   @Mock
   private ServerStreamListener streamListener;
-
   @Mock
   private ServerStreamTracer.Factory streamTracerFactory;
-
   private final ServerTransportListener transportListener =
       mock(ServerTransportListener.class, delegatesTo(new ServerTransportListenerImpl()));
   private final TestServerStreamTracer streamTracer = new TestServerStreamTracer();
-
   private NettyServerStream stream;
   private KeepAliveManager spyKeepAliveManager;
-
   final Queue<InputStream> streamListenerMessageQueue = new LinkedList<>();
 
   private int maxConcurrentStreams = Integer.MAX_VALUE;
@@ -208,6 +201,7 @@ public class NettyServerHandlerTest extends NettyHandlerTestBase<NettyServerHand
     // Simulate receipt of initial remote settings.
     ByteBuf serializedSettings = serializeSettings(new Http2Settings());
     channelRead(serializedSettings);
+    channel().releaseOutbound();
   }
 
   @Test
@@ -229,10 +223,11 @@ public class NettyServerHandlerTest extends NettyHandlerTestBase<NettyServerHand
     createStream();
 
     // Send a frame and verify that it was written.
+    ByteBuf content = content();
     ChannelFuture future = enqueue(
-        new SendGrpcFrameCommand(stream.transportState(), content(), false));
+        new SendGrpcFrameCommand(stream.transportState(), content, false));
     assertTrue(future.isSuccess());
-    verifyWrite().writeData(eq(ctx()), eq(STREAM_ID), eq(content()), eq(0), eq(false),
+    verifyWrite().writeData(eq(ctx()), eq(STREAM_ID), same(content), eq(0), eq(false),
         any(ChannelPromise.class));
   }
 
@@ -267,10 +262,11 @@ public class NettyServerHandlerTest extends NettyHandlerTestBase<NettyServerHand
     // Create a data frame and then trigger the handler to read it.
     ByteBuf frame = grpcDataFrame(STREAM_ID, endStream, contentAsArray());
     channelRead(frame);
+    channel().releaseOutbound();
     verify(streamListener, atLeastOnce())
         .messagesAvailable(any(StreamListener.MessageProducer.class));
     InputStream message = streamListenerMessageQueue.poll();
-    assertArrayEquals(ByteBufUtil.getBytes(content()), ByteStreams.toByteArray(message));
+    assertArrayEquals(contentAsArray(), ByteStreams.toByteArray(message));
     message.close();
     assertNull("no additional message expected", streamListenerMessageQueue.poll());
 
@@ -870,7 +866,7 @@ public class NettyServerHandlerTest extends NettyHandlerTestBase<NettyServerHand
     future.get();
     for (int i = 0; i < 10; i++) {
       future = enqueue(
-          new SendGrpcFrameCommand(stream.transportState(), content().retainedSlice(), false));
+          new SendGrpcFrameCommand(stream.transportState(), content(), false));
       future.get();
       channel().releaseOutbound();
       channelRead(pingFrame(false /* isAck */, 1L));
@@ -1293,6 +1289,7 @@ public class NettyServerHandlerTest extends NettyHandlerTestBase<NettyServerHand
     maxRstPeriodNanos = TimeUnit.MILLISECONDS.toNanos(100);
     manualSetUp();
     rapidReset(maxRstCount);
+
     assertTrue(channel().isOpen());
   }
 
@@ -1302,6 +1299,7 @@ public class NettyServerHandlerTest extends NettyHandlerTestBase<NettyServerHand
     maxRstPeriodNanos = TimeUnit.MILLISECONDS.toNanos(100);
     manualSetUp();
     assertThrows(ClosedChannelException.class, () -> rapidReset(maxRstCount + 1));
+
     assertFalse(channel().isOpen());
   }
 
@@ -1344,11 +1342,7 @@ public class NettyServerHandlerTest extends NettyHandlerTestBase<NettyServerHand
 
   private ByteBuf emptyGrpcFrame(int streamId, boolean endStream) throws Exception {
     ByteBuf buf = NettyTestUtil.messageFrame("");
-    try {
     return dataFrame(streamId, endStream, buf);
-    } finally {
-      buf.release();
-    }
   }
 
   @Override