TEST_P(Http2CodecImplFlowControlTest, EarlyResetRestoresWindow) {
  initialize();
  MockStreamCallbacks callbacks;
  request_encoder_->getStream().addCallbacks(callbacks);

  TestHeaderMapImpl request_headers;
  HttpTestUtility::addDefaultHeaders(request_headers);
  TestHeaderMapImpl expected_headers;
  HttpTestUtility::addDefaultHeaders(expected_headers);
  EXPECT_CALL(request_decoder_, decodeHeaders_(HeaderMapEqual(&expected_headers), false));
  request_encoder_->encodeHeaders(request_headers, false);

  // Force the server stream to be read disabled. This will cause it to stop sending window
  // updates to the client.
  server_->getStream(1)->readDisable(true);

  uint32_t initial_stream_window =
      nghttp2_session_get_stream_effective_local_window_size(client_->session(), 1);
  uint32_t initial_connection_window = nghttp2_session_get_remote_window_size(client_->session());
  // If this limit is changed, this test will fail due to the initial large writes being divided
  // into more than 4 frames. Fast fail here with this explanatory comment.
  ASSERT_EQ(65535, initial_stream_window);
  // One large write may get broken into smaller frames.
  EXPECT_CALL(request_decoder_, decodeData(_, false)).Times(AnyNumber());
  Buffer::OwnedImpl long_data(std::string(initial_stream_window, 'a'));
  // The one giant write will cause the buffer to go over the limit, then drain and go back under
  // the limit.
  request_encoder_->encodeData(long_data, false);

  // Verify that the window is full. The client will not send more data to the server for this
  // stream.
  EXPECT_EQ(0, nghttp2_session_get_stream_local_window_size(server_->session(), 1));
  EXPECT_EQ(0, nghttp2_session_get_stream_remote_window_size(client_->session(), 1));
  EXPECT_EQ(initial_stream_window, server_->getStream(1)->unconsumed_bytes_);
  EXPECT_GT(initial_connection_window, nghttp2_session_get_remote_window_size(client_->session()));

  EXPECT_CALL(server_stream_callbacks_,
              onResetStream(StreamResetReason::LocalRefusedStreamReset, _));
  EXPECT_CALL(callbacks, onAboveWriteBufferHighWatermark()).Times(0);
  EXPECT_CALL(callbacks, onBelowWriteBufferLowWatermark()).Times(0);
  EXPECT_CALL(server_stream_callbacks_, onAboveWriteBufferHighWatermark()).Times(0);
  EXPECT_CALL(server_stream_callbacks_, onBelowWriteBufferLowWatermark()).Times(0);
  EXPECT_CALL(callbacks, onResetStream(StreamResetReason::RemoteRefusedStreamReset, _))
      .WillOnce(Invoke([&](StreamResetReason, absl::string_view) -> void {
        // Test the case where the reset callbacks cause the socket to fill up,
        // causing the underlying connection to back up. Given the stream is
        // being destroyed the watermark callbacks should not fire (mocks for Times(0)
        // above)
        client_->onUnderlyingConnectionAboveWriteBufferHighWatermark();
        client_->onUnderlyingConnectionBelowWriteBufferLowWatermark();
        server_->onUnderlyingConnectionAboveWriteBufferHighWatermark();
        server_->onUnderlyingConnectionBelowWriteBufferLowWatermark();
      }));
  response_encoder_->getStream().resetStream(StreamResetReason::LocalRefusedStreamReset);

  // Regression test that the window is consumed even if the stream is destroyed early.
  EXPECT_EQ(initial_connection_window, nghttp2_session_get_remote_window_size(client_->session()));
}
TEST_P(Http2CodecImplFlowControlTest, EarlyResetRestoresWindow) {
  initialize();
  MockStreamCallbacks callbacks;
  request_encoder_->getStream().addCallbacks(callbacks);

  TestHeaderMapImpl request_headers;
  HttpTestUtility::addDefaultHeaders(request_headers);
  TestHeaderMapImpl expected_headers;
  HttpTestUtility::addDefaultHeaders(expected_headers);
  EXPECT_CALL(request_decoder_, decodeHeaders_(HeaderMapEqual(&expected_headers), false));
  request_encoder_->encodeHeaders(request_headers, false);

   
   
  server_->getStream(1)->readDisable(true);

  uint32_t initial_stream_window =
      nghttp2_session_get_stream_effective_local_window_size(client_->session(), 1);
  uint32_t initial_connection_window = nghttp2_session_get_remote_window_size(client_->session());
   
   
  ASSERT_EQ(65535, initial_stream_window);
   
  EXPECT_CALL(request_decoder_, decodeData(_, false)).Times(AnyNumber());
  Buffer::OwnedImpl long_data(std::string(initial_stream_window, 'a'));
   
   
  request_encoder_->encodeData(long_data, false);

   
   
  EXPECT_EQ(0, nghttp2_session_get_stream_local_window_size(server_->session(), 1));
  EXPECT_EQ(0, nghttp2_session_get_stream_remote_window_size(client_->session(), 1));
  EXPECT_EQ(initial_stream_window, server_->getStream(1)->unconsumed_bytes_);
  EXPECT_GT(initial_connection_window, nghttp2_session_get_remote_window_size(client_->session()));

  EXPECT_CALL(server_stream_callbacks_,
              onResetStream(StreamResetReason::LocalRefusedStreamReset, _));
  EXPECT_CALL(callbacks, onAboveWriteBufferHighWatermark()).Times(0);
  EXPECT_CALL(callbacks, onBelowWriteBufferLowWatermark()).Times(0);
  EXPECT_CALL(server_stream_callbacks_, onAboveWriteBufferHighWatermark()).Times(0);
  EXPECT_CALL(server_stream_callbacks_, onBelowWriteBufferLowWatermark()).Times(0);
  EXPECT_CALL(callbacks, onResetStream(StreamResetReason::RemoteRefusedStreamReset, _))
      .WillOnce(Invoke([&](StreamResetReason, absl::string_view) -> void {
         
         
         
         
        client_->onUnderlyingConnectionAboveWriteBufferHighWatermark();
        client_->onUnderlyingConnectionBelowWriteBufferLowWatermark();
        server_->onUnderlyingConnectionAboveWriteBufferHighWatermark();
        server_->onUnderlyingConnectionBelowWriteBufferLowWatermark();
      }));
  response_encoder_->getStream().resetStream(StreamResetReason::LocalRefusedStreamReset);

   
  EXPECT_EQ(initial_connection_window, nghttp2_session_get_remote_window_size(client_->session()));
}