Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 1 | # Copyright 2016 gRPC authors. |
Alexander Polcyn | 50fdc8a | 2017-02-09 21:06:08 -0800 | [diff] [blame] | 2 | # |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 3 | # Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | # you may not use this file except in compliance with the License. |
| 5 | # You may obtain a copy of the License at |
Alexander Polcyn | 50fdc8a | 2017-02-09 21:06:08 -0800 | [diff] [blame] | 6 | # |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 7 | # http://www.apache.org/licenses/LICENSE-2.0 |
Alexander Polcyn | 50fdc8a | 2017-02-09 21:06:08 -0800 | [diff] [blame] | 8 | # |
Jan Tattermusch | 7897ae9 | 2017-06-07 22:57:36 +0200 | [diff] [blame] | 9 | # Unless required by applicable law or agreed to in writing, software |
| 10 | # distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | # See the License for the specific language governing permissions and |
| 13 | # limitations under the License. |
Alexander Polcyn | 50fdc8a | 2017-02-09 21:06:08 -0800 | [diff] [blame] | 14 | |
| 15 | import http2_base_server |
| 16 | import logging |
| 17 | import messages_pb2 |
| 18 | |
| 19 | # Set the number of padding bytes per data frame to be very large |
| 20 | # relative to the number of data bytes for each data frame sent. |
| 21 | _LARGE_PADDING_LENGTH = 255 |
| 22 | _SMALL_READ_CHUNK_SIZE = 5 |
| 23 | |
| 24 | class TestDataFramePadding(object): |
| 25 | """ |
| 26 | In response to an incoming request, this test sends headers, followed by |
| 27 | data, followed by a reset stream frame. Client asserts that the RPC failed. |
| 28 | Client needs to deliver the complete message to the application layer. |
| 29 | """ |
| 30 | def __init__(self, use_padding=True): |
| 31 | self._base_server = http2_base_server.H2ProtocolBaseServer() |
| 32 | self._base_server._handlers['DataReceived'] = self.on_data_received |
| 33 | self._base_server._handlers['WindowUpdated'] = self.on_window_update |
| 34 | self._base_server._handlers['RequestReceived'] = self.on_request_received |
| 35 | |
| 36 | # _total_updates maps stream ids to total flow control updates received |
| 37 | self._total_updates = {} |
| 38 | # zero window updates so far for connection window (stream id '0') |
| 39 | self._total_updates[0] = 0 |
| 40 | self._read_chunk_size = _SMALL_READ_CHUNK_SIZE |
| 41 | |
| 42 | if use_padding: |
| 43 | self._pad_length = _LARGE_PADDING_LENGTH |
| 44 | else: |
| 45 | self._pad_length = None |
| 46 | |
| 47 | def get_base_server(self): |
| 48 | return self._base_server |
| 49 | |
| 50 | def on_data_received(self, event): |
| 51 | logging.info('on data received. Stream id: %d. Data length: %d' % (event.stream_id, len(event.data))) |
| 52 | self._base_server.on_data_received_default(event) |
| 53 | if len(event.data) == 0: |
| 54 | return |
| 55 | sr = self._base_server.parse_received_data(event.stream_id) |
| 56 | stream_bytes = '' |
| 57 | # Check if full grpc msg has been read into the recv buffer yet |
| 58 | if sr: |
| 59 | response_data = self._base_server.default_response_data(sr.response_size) |
| 60 | logging.info('Stream id: %d. total resp size: %d' % (event.stream_id, len(response_data))) |
| 61 | # Begin sending the response. Add ``self._pad_length`` padding to each |
| 62 | # data frame and split the whole message into data frames each carrying |
| 63 | # only self._read_chunk_size of data. |
| 64 | # The purpose is to have the majority of the data frame response bytes |
| 65 | # be padding bytes, since ``self._pad_length`` >> ``self._read_chunk_size``. |
| 66 | self._base_server.setup_send(response_data , event.stream_id, pad_length=self._pad_length, read_chunk_size=self._read_chunk_size) |
| 67 | |
| 68 | def on_request_received(self, event): |
| 69 | self._base_server.on_request_received_default(event) |
| 70 | logging.info('on request received. Stream id: %s.' % event.stream_id) |
| 71 | self._total_updates[event.stream_id] = 0 |
| 72 | |
| 73 | # Log debug info and try to resume sending on all currently active streams. |
| 74 | def on_window_update(self, event): |
| 75 | logging.info('on window update. Stream id: %s. Delta: %s' % (event.stream_id, event.delta)) |
| 76 | self._total_updates[event.stream_id] += event.delta |
| 77 | total = self._total_updates[event.stream_id] |
| 78 | logging.info('... - total updates for stream %d : %d' % (event.stream_id, total)) |
| 79 | self._base_server.on_window_update_default(event, pad_length=self._pad_length, read_chunk_size=self._read_chunk_size) |