mirror of https://github.com/grpc/grpc.git
The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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94 lines
4.5 KiB
94 lines
4.5 KiB
# Copyright 2016, Google Inc. |
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# All rights reserved. |
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# |
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# Redistribution and use in source and binary forms, with or without |
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# modification, are permitted provided that the following conditions are |
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# met: |
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# |
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# * Redistributions of source code must retain the above copyright |
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# notice, this list of conditions and the following disclaimer. |
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# * Redistributions in binary form must reproduce the above |
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# copyright notice, this list of conditions and the following disclaimer |
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# in the documentation and/or other materials provided with the |
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# distribution. |
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# * Neither the name of Google Inc. nor the names of its |
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# contributors may be used to endorse or promote products derived from |
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# this software without specific prior written permission. |
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# |
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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import http2_base_server |
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import logging |
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import messages_pb2 |
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# Set the number of padding bytes per data frame to be very large |
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# relative to the number of data bytes for each data frame sent. |
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_LARGE_PADDING_LENGTH = 255 |
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_SMALL_READ_CHUNK_SIZE = 5 |
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class TestDataFramePadding(object): |
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""" |
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In response to an incoming request, this test sends headers, followed by |
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data, followed by a reset stream frame. Client asserts that the RPC failed. |
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Client needs to deliver the complete message to the application layer. |
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""" |
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def __init__(self, use_padding=True): |
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self._base_server = http2_base_server.H2ProtocolBaseServer() |
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self._base_server._handlers['DataReceived'] = self.on_data_received |
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self._base_server._handlers['WindowUpdated'] = self.on_window_update |
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self._base_server._handlers['RequestReceived'] = self.on_request_received |
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# _total_updates maps stream ids to total flow control updates received |
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self._total_updates = {} |
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# zero window updates so far for connection window (stream id '0') |
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self._total_updates[0] = 0 |
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self._read_chunk_size = _SMALL_READ_CHUNK_SIZE |
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if use_padding: |
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self._pad_length = _LARGE_PADDING_LENGTH |
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else: |
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self._pad_length = None |
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def get_base_server(self): |
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return self._base_server |
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def on_data_received(self, event): |
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logging.info('on data received. Stream id: %d. Data length: %d' % (event.stream_id, len(event.data))) |
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self._base_server.on_data_received_default(event) |
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if len(event.data) == 0: |
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return |
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sr = self._base_server.parse_received_data(event.stream_id) |
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stream_bytes = '' |
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# Check if full grpc msg has been read into the recv buffer yet |
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if sr: |
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response_data = self._base_server.default_response_data(sr.response_size) |
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logging.info('Stream id: %d. total resp size: %d' % (event.stream_id, len(response_data))) |
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# Begin sending the response. Add ``self._pad_length`` padding to each |
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# data frame and split the whole message into data frames each carrying |
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# only self._read_chunk_size of data. |
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# The purpose is to have the majority of the data frame response bytes |
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# be padding bytes, since ``self._pad_length`` >> ``self._read_chunk_size``. |
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self._base_server.setup_send(response_data , event.stream_id, pad_length=self._pad_length, read_chunk_size=self._read_chunk_size) |
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def on_request_received(self, event): |
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self._base_server.on_request_received_default(event) |
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logging.info('on request received. Stream id: %s.' % event.stream_id) |
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self._total_updates[event.stream_id] = 0 |
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# Log debug info and try to resume sending on all currently active streams. |
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def on_window_update(self, event): |
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logging.info('on window update. Stream id: %s. Delta: %s' % (event.stream_id, event.delta)) |
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self._total_updates[event.stream_id] += event.delta |
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total = self._total_updates[event.stream_id] |
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logging.info('... - total updates for stream %d : %d' % (event.stream_id, total)) |
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self._base_server.on_window_update_default(event, pad_length=self._pad_length, read_chunk_size=self._read_chunk_size)
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