@VisibleForTesting
static void prepareHeaders(
    Metadata headers,
    DecompressorRegistry decompressorRegistry,
    Compressor compressor,
    boolean fullStreamDecompression) {
  headers.discardAll(MESSAGE_ENCODING_KEY);
  if (compressor != Codec.Identity.NONE) {
    headers.put(MESSAGE_ENCODING_KEY, compressor.getMessageEncoding());
  }

  headers.discardAll(MESSAGE_ACCEPT_ENCODING_KEY);
  byte[] advertisedEncodings =
      InternalDecompressorRegistry.getRawAdvertisedMessageEncodings(decompressorRegistry);
  if (advertisedEncodings.length != 0) {
    headers.put(MESSAGE_ACCEPT_ENCODING_KEY, advertisedEncodings);
  }

  headers.discardAll(CONTENT_ENCODING_KEY);
  headers.discardAll(CONTENT_ACCEPT_ENCODING_KEY);
  if (fullStreamDecompression) {
    headers.put(CONTENT_ACCEPT_ENCODING_KEY, FULL_STREAM_DECOMPRESSION_ENCODINGS);
  }
}
 

private InputStream getCompressedBody() {
  if (decompressor == Codec.Identity.NONE) {
    throw Status.INTERNAL.withDescription(
        "Can't decode compressed gRPC message as compression not configured")
        .asRuntimeException();
  }

  try {
    // Enforce the maxMessageSize limit on the returned stream.
    InputStream unlimitedStream =
        decompressor.decompress(ReadableBuffers.openStream(nextFrame, true));
    return new SizeEnforcingInputStream(
        unlimitedStream, maxInboundMessageSize, statsTraceCtx);
  } catch (IOException e) {
    throw new RuntimeException(e);
  }
}
 

@Test
public void prepareHeaders_removeReservedHeaders() {
  Metadata m = new Metadata();
  m.put(GrpcUtil.MESSAGE_ENCODING_KEY, "gzip");
  m.put(GrpcUtil.MESSAGE_ACCEPT_ENCODING_KEY, "gzip".getBytes(GrpcUtil.US_ASCII));
  m.put(GrpcUtil.CONTENT_ENCODING_KEY, "gzip");
  m.put(GrpcUtil.CONTENT_ACCEPT_ENCODING_KEY, "gzip".getBytes(GrpcUtil.US_ASCII));

  ClientCallImpl.prepareHeaders(
      m, DecompressorRegistry.emptyInstance(), Codec.Identity.NONE, false);

  assertNull(m.get(GrpcUtil.MESSAGE_ENCODING_KEY));
  assertNull(m.get(GrpcUtil.MESSAGE_ACCEPT_ENCODING_KEY));
  assertNull(m.get(GrpcUtil.CONTENT_ENCODING_KEY));
  assertNull(m.get(GrpcUtil.CONTENT_ACCEPT_ENCODING_KEY));
}
 

@Test
public void inboundHeadersReceived_disallowsContentAndMessageEncoding() {
  AbstractClientStream stream =
      new BaseAbstractClientStream(allocator, statsTraceCtx, transportTracer);
  stream.start(mockListener);
  Metadata headers = new Metadata();
  headers.put(GrpcUtil.CONTENT_ENCODING_KEY, "gzip");
  headers.put(GrpcUtil.MESSAGE_ENCODING_KEY, new Codec.Gzip().getMessageEncoding());

  stream.setFullStreamDecompression(true);
  stream.transportState().inboundHeadersReceived(headers);

  verifyNoMoreInteractions(mockListener);
  Throwable t = ((BaseTransportState) stream.transportState()).getDeframeFailedCause();
  assertEquals(Status.INTERNAL.getCode(), Status.fromThrowable(t).getCode());
  assertTrue(
      "unexpected deframe failed description",
      Status.fromThrowable(t)
          .getDescription()
          .equals("Full stream and gRPC message encoding cannot both be set"));
}
 

@Test
public void endOfStreamWithInvalidGzipBlockShouldNotifyDeframerClosedWithPartialMessage() {
  assumeTrue("test only valid for full-stream compression", useGzipInflatingBuffer);

  // Create new deframer to allow writing bytes directly to the GzipInflatingBuffer
  MessageDeframer deframer = new MessageDeframer(listener, Codec.Identity.NONE,
          DEFAULT_MAX_MESSAGE_SIZE, statsTraceCtx, transportTracer);
  deframer.setFullStreamDecompressor(new GzipInflatingBuffer());
  deframer.request(1);
  fakeClock.forwardTime(10, TimeUnit.MILLISECONDS);
  deframer.deframe(buffer(new byte[1]));
  deframer.closeWhenComplete();
  verify(listener).deframerClosed(true);
  verifyNoMoreInteractions(listener);
  checkStats(tracer, transportTracer.getStats(), fakeClock);
}
 

@Test
public void compressed() throws Exception {
  allocator = new BytesWritableBufferAllocator(100, Integer.MAX_VALUE);
  // setMessageCompression should default to true
  framer = new MessageFramer(sink, allocator, statsTraceCtx)
      .setCompressor(new Codec.Gzip());
  writeKnownLength(framer, new byte[1000]);
  framer.flush();
  // The GRPC header is written first as a separate frame.
  // The message count is only bumped when a message is completely written.
  verify(sink).deliverFrame(frameCaptor.capture(), eq(false), eq(false), eq(0));
  verify(sink).deliverFrame(frameCaptor.capture(), eq(false), eq(true), eq(1));

  // Check the header
  ByteWritableBuffer buffer = frameCaptor.getAllValues().get(0);

  assertEquals(0x1, buffer.data[0]);
  ByteBuffer byteBuf = ByteBuffer.wrap(buffer.data, 1, 4);
  byteBuf.order(ByteOrder.BIG_ENDIAN);
  int length = byteBuf.getInt();
  // compressed data should be smaller than uncompressed data.
  assertTrue(length < 1000);

  assertEquals(frameCaptor.getAllValues().get(1).size(), length);
  checkStats(length, 1000);
}
 

@Test
public void dontCompressIfNotRequested() throws Exception {
  allocator = new BytesWritableBufferAllocator(100, Integer.MAX_VALUE);
  framer = new MessageFramer(sink, allocator, statsTraceCtx)
      .setCompressor(new Codec.Gzip())
      .setMessageCompression(false);
  writeKnownLength(framer, new byte[1000]);
  framer.flush();
  // The GRPC header is written first as a separate frame
  verify(sink).deliverFrame(frameCaptor.capture(), eq(false), eq(true), eq(1));

  // Check the header
  ByteWritableBuffer buffer = frameCaptor.getAllValues().get(0);
  // We purposefully don't check the last byte of length, since that depends on how exactly it
  // compressed.

  assertEquals(0x0, buffer.data[0]);
  ByteBuffer byteBuf = ByteBuffer.wrap(buffer.data, 1, 4);
  byteBuf.order(ByteOrder.BIG_ENDIAN);
  int length = byteBuf.getInt();
  assertEquals(1000, length);

  assertEquals(buffer.data.length - 5 , length);
  checkStats(1000, 1000);
}
 

@ConditionalOnBean(GrpcCodecDiscoverer.class)
@ConditionalOnMissingBean
@Bean
public DecompressorRegistry defaultDecompressorRegistry(final GrpcCodecDiscoverer codecDiscoverer) {
    log.debug("Found GrpcCodecDiscoverer -> Creating custom DecompressorRegistry");
    DecompressorRegistry registry = DecompressorRegistry.getDefaultInstance();
    for (final GrpcCodecDefinition definition : codecDiscoverer.findGrpcCodecs()) {
        if (definition.getCodecType().isForDecompression()) {
            final Codec codec = definition.getCodec();
            final boolean isAdvertised = definition.isAdvertised();
            log.debug("Registering {} decompressor: '{}' ({})",
                    isAdvertised ? "advertised" : "", codec.getMessageEncoding(), codec.getClass().getName());
            registry = registry.with(codec, isAdvertised);
        }
    }
    return registry;
}
 

@Override
public Collection<GrpcCodecDefinition> findGrpcCodecs() {
    if (this.definitions == null) {
        log.debug("Searching for codecs...");
        final String[] beanNames = this.applicationContext.getBeanNamesForAnnotation(GrpcCodec.class);
        final ImmutableList.Builder<GrpcCodecDefinition> builder = ImmutableList.builder();
        for (final String beanName : beanNames) {
            final Codec codec = this.applicationContext.getBean(beanName, Codec.class);
            final GrpcCodec annotation = this.applicationContext.findAnnotationOnBean(beanName, GrpcCodec.class);
            builder.add(new GrpcCodecDefinition(codec, annotation.advertised(), annotation.codecType()));
            log.debug("Found gRPC codec: {}, bean: {}, class: {}",
                    codec.getMessageEncoding(), beanName, codec.getClass().getName());
        }
        this.definitions = builder.build();
        log.debug("Done");
    }
    return this.definitions;
}
 

@ConditionalOnBean(GrpcCodecDiscoverer.class)
@ConditionalOnMissingBean
@Bean
public DecompressorRegistry defaultDecompressorRegistry(final GrpcCodecDiscoverer codecDiscoverer) {
    log.debug("Found GrpcCodecDiscoverer -> Creating custom DecompressorRegistry");
    DecompressorRegistry registry = DecompressorRegistry.getDefaultInstance();
    for (final GrpcCodecDefinition definition : codecDiscoverer.findGrpcCodecs()) {
        if (definition.getCodecType().isForDecompression()) {
            final Codec codec = definition.getCodec();
            final boolean isAdvertised = definition.isAdvertised();
            log.debug("Registering {} decompressor: '{}' ({})",
                    isAdvertised ? "advertised" : "", codec.getMessageEncoding(), codec.getClass().getName());
            registry = registry.with(codec, isAdvertised);
        }
    }
    return registry;
}
 

@Override
public Collection<GrpcCodecDefinition> findGrpcCodecs() {
    if (this.definitions == null) {
        log.debug("Searching for codecs...");
        final String[] beanNames = this.applicationContext.getBeanNamesForAnnotation(GrpcCodec.class);
        final ImmutableList.Builder<GrpcCodecDefinition> builder = ImmutableList.builder();
        for (final String beanName : beanNames) {
            final Codec codec = this.applicationContext.getBean(beanName, Codec.class);
            final GrpcCodec annotation = this.applicationContext.findAnnotationOnBean(beanName, GrpcCodec.class);
            builder.add(new GrpcCodecDefinition(codec, annotation.advertised(), annotation.codecType()));
            log.debug("Found gRPC codec: {}, bean: {}, class: {}",
                    codec.getMessageEncoding(), beanName, codec.getClass().getName());
        }
        this.definitions = builder.build();
        log.debug("Done");
    }
    return this.definitions;
}
 

@Test
void uncompressedClient_compressedEndpoint() throws Exception {
    final ManagedChannel nonDecompressingChannel =
            ManagedChannelBuilder.forAddress("127.0.0.1", server.httpPort())
                                 .decompressorRegistry(
                                         DecompressorRegistry.emptyInstance()
                                                             .with(Codec.Identity.NONE, false))
                                 .usePlaintext()
                                 .build();
    final UnitTestServiceBlockingStub client = UnitTestServiceGrpc.newBlockingStub(
            nonDecompressingChannel);
    assertThat(client.staticUnaryCallSetsMessageCompression(REQUEST_MESSAGE))
            .isEqualTo(RESPONSE_MESSAGE);
    nonDecompressingChannel.shutdownNow();

    checkRequestLog((rpcReq, rpcRes, grpcStatus) -> {
        assertThat(rpcReq.method()).isEqualTo(
                "armeria.grpc.testing.UnitTestService/StaticUnaryCallSetsMessageCompression");
        assertThat(rpcReq.params()).containsExactly(REQUEST_MESSAGE);
        assertThat(rpcRes.get()).isEqualTo(RESPONSE_MESSAGE);
    });
}
 

@VisibleForTesting
static void prepareHeaders(
    Metadata headers,
    DecompressorRegistry decompressorRegistry,
    Compressor compressor,
    boolean fullStreamDecompression) {
  headers.discardAll(MESSAGE_ENCODING_KEY);
  if (compressor != Codec.Identity.NONE) {
    headers.put(MESSAGE_ENCODING_KEY, compressor.getMessageEncoding());
  }

  headers.discardAll(MESSAGE_ACCEPT_ENCODING_KEY);
  byte[] advertisedEncodings =
      InternalDecompressorRegistry.getRawAdvertisedMessageEncodings(decompressorRegistry);
  if (advertisedEncodings.length != 0) {
    headers.put(MESSAGE_ACCEPT_ENCODING_KEY, advertisedEncodings);
  }

  headers.discardAll(CONTENT_ENCODING_KEY);
  headers.discardAll(CONTENT_ACCEPT_ENCODING_KEY);
  if (fullStreamDecompression) {
    headers.put(CONTENT_ACCEPT_ENCODING_KEY, FULL_STREAM_DECOMPRESSION_ENCODINGS);
  }
}
 

private InputStream getCompressedBody() {
  if (decompressor == Codec.Identity.NONE) {
    throw Status.INTERNAL.withDescription(
        "Can't decode compressed gRPC message as compression not configured")
        .asRuntimeException();
  }

  try {
    // Enforce the maxMessageSize limit on the returned stream.
    InputStream unlimitedStream =
        decompressor.decompress(ReadableBuffers.openStream(nextFrame, true));
    return new SizeEnforcingInputStream(
        unlimitedStream, maxInboundMessageSize, statsTraceCtx);
  } catch (IOException e) {
    throw new RuntimeException(e);
  }
}
 

@Test
public void prepareHeaders_removeReservedHeaders() {
  Metadata m = new Metadata();
  m.put(GrpcUtil.MESSAGE_ENCODING_KEY, "gzip");
  m.put(GrpcUtil.MESSAGE_ACCEPT_ENCODING_KEY, "gzip".getBytes(GrpcUtil.US_ASCII));
  m.put(GrpcUtil.CONTENT_ENCODING_KEY, "gzip");
  m.put(GrpcUtil.CONTENT_ACCEPT_ENCODING_KEY, "gzip".getBytes(GrpcUtil.US_ASCII));

  ClientCallImpl.prepareHeaders(
      m, DecompressorRegistry.emptyInstance(), Codec.Identity.NONE, false);

  assertNull(m.get(GrpcUtil.MESSAGE_ENCODING_KEY));
  assertNull(m.get(GrpcUtil.MESSAGE_ACCEPT_ENCODING_KEY));
  assertNull(m.get(GrpcUtil.CONTENT_ENCODING_KEY));
  assertNull(m.get(GrpcUtil.CONTENT_ACCEPT_ENCODING_KEY));
}
 

@Test
public void inboundHeadersReceived_disallowsContentAndMessageEncoding() {
  AbstractClientStream stream =
      new BaseAbstractClientStream(allocator, statsTraceCtx, transportTracer);
  stream.start(mockListener);
  Metadata headers = new Metadata();
  headers.put(GrpcUtil.CONTENT_ENCODING_KEY, "gzip");
  headers.put(GrpcUtil.MESSAGE_ENCODING_KEY, new Codec.Gzip().getMessageEncoding());

  stream.setFullStreamDecompression(true);
  stream.transportState().inboundHeadersReceived(headers);

  verifyNoMoreInteractions(mockListener);
  Throwable t = ((BaseTransportState) stream.transportState()).getDeframeFailedCause();
  assertEquals(Status.INTERNAL.getCode(), Status.fromThrowable(t).getCode());
  assertTrue(
      "unexpected deframe failed description",
      Status.fromThrowable(t)
          .getDescription()
          .equals("Full stream and gRPC message encoding cannot both be set"));
}
 

@Test
public void endOfStreamWithInvalidGzipBlockShouldNotifyDeframerClosedWithPartialMessage() {
  assumeTrue("test only valid for full-stream compression", useGzipInflatingBuffer);

  // Create new deframer to allow writing bytes directly to the GzipInflatingBuffer
  MessageDeframer deframer = new MessageDeframer(listener, Codec.Identity.NONE,
          DEFAULT_MAX_MESSAGE_SIZE, statsTraceCtx, transportTracer);
  deframer.setFullStreamDecompressor(new GzipInflatingBuffer());
  deframer.request(1);
  fakeClock.forwardTime(10, TimeUnit.MILLISECONDS);
  deframer.deframe(buffer(new byte[1]));
  deframer.closeWhenComplete();
  verify(listener).deframerClosed(true);
  verifyNoMoreInteractions(listener);
  checkStats(tracer, transportTracer.getStats(), fakeClock);
}
 

@Test
public void compressed() {
  allocator = new BytesWritableBufferAllocator(100, Integer.MAX_VALUE);
  // setMessageCompression should default to true
  framer = new MessageFramer(sink, allocator, statsTraceCtx)
      .setCompressor(new Codec.Gzip());
  writeKnownLength(framer, new byte[1000]);
  framer.flush();
  // The GRPC header is written first as a separate frame.
  // The message count is only bumped when a message is completely written.
  verify(sink).deliverFrame(frameCaptor.capture(), eq(false), eq(false), eq(0));
  verify(sink).deliverFrame(frameCaptor.capture(), eq(false), eq(true), eq(1));

  // Check the header
  ByteWritableBuffer buffer = frameCaptor.getAllValues().get(0);

  assertEquals(0x1, buffer.data[0]);
  ByteBuffer byteBuf = ByteBuffer.wrap(buffer.data, 1, 4);
  byteBuf.order(ByteOrder.BIG_ENDIAN);
  int length = byteBuf.getInt();
  // compressed data should be smaller than uncompressed data.
  assertTrue(length < 1000);

  assertEquals(frameCaptor.getAllValues().get(1).size(), length);
  checkStats(length, 1000);
}
 

@Test
public void dontCompressIfNotRequested() {
  allocator = new BytesWritableBufferAllocator(100, Integer.MAX_VALUE);
  framer = new MessageFramer(sink, allocator, statsTraceCtx)
      .setCompressor(new Codec.Gzip())
      .setMessageCompression(false);
  writeKnownLength(framer, new byte[1000]);
  framer.flush();
  // The GRPC header is written first as a separate frame
  verify(sink).deliverFrame(frameCaptor.capture(), eq(false), eq(true), eq(1));

  // Check the header
  ByteWritableBuffer buffer = frameCaptor.getAllValues().get(0);
  // We purposefully don't check the last byte of length, since that depends on how exactly it
  // compressed.

  assertEquals(0x0, buffer.data[0]);
  ByteBuffer byteBuf = ByteBuffer.wrap(buffer.data, 1, 4);
  byteBuf.order(ByteOrder.BIG_ENDIAN);
  int length = byteBuf.getInt();
  assertEquals(1000, length);

  assertEquals(buffer.data.length - 5 , length);
  checkStats(1000, 1000);
}
 

@Override
public void sendHeaders(Metadata headers) {
  checkState(!sendHeadersCalled, "sendHeaders has already been called");
  checkState(!closeCalled, "call is closed");

  headers.discardAll(MESSAGE_ENCODING_KEY);
  if (compressor == null) {
    compressor = Codec.Identity.NONE;
  } else {
    if (messageAcceptEncoding != null) {
      // TODO(carl-mastrangelo): remove the string allocation.
      if (!GrpcUtil.iterableContains(
          ACCEPT_ENCODING_SPLITTER.split(new String(messageAcceptEncoding, GrpcUtil.US_ASCII)),
          compressor.getMessageEncoding())) {
        // resort to using no compression.
        compressor = Codec.Identity.NONE;
      }
    } else {
      compressor = Codec.Identity.NONE;
    }
  }

  // Always put compressor, even if it's identity.
  headers.put(MESSAGE_ENCODING_KEY, compressor.getMessageEncoding());

  stream.setCompressor(compressor);

  headers.discardAll(MESSAGE_ACCEPT_ENCODING_KEY);
  byte[] advertisedEncodings =
      InternalDecompressorRegistry.getRawAdvertisedMessageEncodings(decompressorRegistry);
  if (advertisedEncodings.length != 0) {
    headers.put(MESSAGE_ACCEPT_ENCODING_KEY, advertisedEncodings);
  }

  // Don't check if sendMessage has been called, since it requires that sendHeaders was already
  // called.
  sendHeadersCalled = true;
  stream.writeHeaders(headers);
}
 

protected TransportState(
    int maxMessageSize,
    StatsTraceContext statsTraceCtx,
    TransportTracer transportTracer) {
  this.statsTraceCtx = checkNotNull(statsTraceCtx, "statsTraceCtx");
  this.transportTracer = checkNotNull(transportTracer, "transportTracer");
  deframer = new MessageDeframer(
      this,
      Codec.Identity.NONE,
      maxMessageSize,
      statsTraceCtx,
      transportTracer);
}
 

@Override
public void setFullStreamDecompressor(GzipInflatingBuffer fullStreamDecompressor) {
  checkState(decompressor == Codec.Identity.NONE, "per-message decompressor already set");
  checkState(this.fullStreamDecompressor == null, "full stream decompressor already set");
  this.fullStreamDecompressor =
      checkNotNull(fullStreamDecompressor, "Can't pass a null full stream decompressor");
  unprocessed = null;
}
 

@Test
public void setStream_sendsAllMessages() {
  stream.start(listener);
  stream.setCompressor(Codec.Identity.NONE);
  stream.setDecompressorRegistry(DecompressorRegistry.getDefaultInstance());

  stream.setMessageCompression(true);
  InputStream message = new ByteArrayInputStream(new byte[]{'a'});
  stream.writeMessage(message);
  stream.setMessageCompression(false);
  stream.writeMessage(message);

  stream.setStream(realStream);

  verify(realStream).setCompressor(Codec.Identity.NONE);
  verify(realStream).setDecompressorRegistry(DecompressorRegistry.getDefaultInstance());

  verify(realStream).setMessageCompression(true);
  verify(realStream).setMessageCompression(false);

  verify(realStream, times(2)).writeMessage(message);
  verify(realStream).start(listenerCaptor.capture());

  stream.writeMessage(message);
  verify(realStream, times(3)).writeMessage(message);

  verifyNoMoreInteractions(listener);
  listenerCaptor.getValue().onReady();
  verify(listener).onReady();
}
 

@Test
public void prepareHeaders_userAgentIgnored() {
  Metadata m = new Metadata();
  m.put(GrpcUtil.USER_AGENT_KEY, "batmobile");
  ClientCallImpl.prepareHeaders(m, decompressorRegistry, Codec.Identity.NONE, false);

  // User Agent is removed and set by the transport
  assertThat(m.get(GrpcUtil.USER_AGENT_KEY)).isNotNull();
}
 

@Test
public void prepareHeaders_ignoreIdentityEncoding() {
  Metadata m = new Metadata();
  ClientCallImpl.prepareHeaders(m, decompressorRegistry, Codec.Identity.NONE, false);

  assertNull(m.get(GrpcUtil.MESSAGE_ENCODING_KEY));
}
 

@Test
public void prepareHeaders_noAcceptedContentEncodingsWithoutFullStreamDecompressionEnabled() {
  Metadata m = new Metadata();
  ClientCallImpl.prepareHeaders(m, decompressorRegistry, Codec.Identity.NONE, false);

  assertNull(m.get(GrpcUtil.CONTENT_ACCEPT_ENCODING_KEY));
}
 

@Test
public void inboundHeadersReceived_acceptsGzipMessageEncoding() {
  AbstractClientStream stream =
      new BaseAbstractClientStream(allocator, statsTraceCtx, transportTracer);
  stream.start(mockListener);
  Metadata headers = new Metadata();
  headers.put(GrpcUtil.MESSAGE_ENCODING_KEY, new Codec.Gzip().getMessageEncoding());

  stream.transportState().inboundHeadersReceived(headers);
  verify(mockListener).headersRead(headers);
}
 

@Test
public void inboundHeadersReceived_acceptsIdentityMessageEncoding() {
  AbstractClientStream stream =
      new BaseAbstractClientStream(allocator, statsTraceCtx, transportTracer);
  stream.start(mockListener);
  Metadata headers = new Metadata();
  headers.put(GrpcUtil.MESSAGE_ENCODING_KEY, Codec.Identity.NONE.getMessageEncoding());

  stream.transportState().inboundHeadersReceived(headers);
  verify(mockListener).headersRead(headers);
}
 

@Test
public void compressed() {
  deframer = new MessageDeframer(listener, new Codec.Gzip(), DEFAULT_MAX_MESSAGE_SIZE,
          statsTraceCtx, transportTracer);
  deframer.request(1);

  byte[] payload = compress(new byte[1000]);
  assertTrue(payload.length < 100);
  byte[] header = new byte[]{1, 0, 0, 0, (byte) payload.length};
  deframer.deframe(buffer(Bytes.concat(header, payload)));
  verify(listener).messagesAvailable(producer.capture());
  assertEquals(Bytes.asList(new byte[1000]), bytes(producer.getValue().next()));
  verify(listener, atLeastOnce()).bytesRead(anyInt());
  verifyNoMoreInteractions(listener);
}
 

@Test
public void zeroLengthCompressibleMessageIsNotCompressed() {
  framer.setCompressor(new Codec.Gzip());
  framer.setMessageCompression(true);
  writeKnownLength(framer, new byte[]{});
  framer.flush();
  verify(sink).deliverFrame(toWriteBuffer(new byte[] {0, 0, 0, 0, 0}), false, true, 1);
  checkStats(0, 0);
}