1# Copyright 2016 gRPC authors.
2#
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
6#
7#     http://www.apache.org/licenses/LICENSE-2.0
8#
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.
14
15import hyperframe.frame
16import logging
17
18import http2_base_server
19
20class TestcaseSettingsMaxStreams(object):
21  """
22    This test sets MAX_CONCURRENT_STREAMS to 1 and asserts that at any point
23    only 1 stream is active.
24  """
25  def __init__(self):
26    self._base_server = http2_base_server.H2ProtocolBaseServer()
27    self._base_server._handlers['DataReceived'] = self.on_data_received
28    self._base_server._handlers['ConnectionMade'] = self.on_connection_made
29
30  def get_base_server(self):
31    return self._base_server
32
33  def on_connection_made(self):
34    logging.info('Connection Made')
35    self._base_server._conn.initiate_connection()
36    self._base_server._conn.update_settings(
37                  {hyperframe.frame.SettingsFrame.MAX_CONCURRENT_STREAMS: 1})
38    self._base_server.transport.setTcpNoDelay(True)
39    self._base_server.transport.write(self._base_server._conn.data_to_send())
40
41  def on_data_received(self, event):
42    self._base_server.on_data_received_default(event)
43    sr = self._base_server.parse_received_data(event.stream_id)
44    if sr:
45      logging.info('Creating response of size = %s' % sr.response_size)
46      response_data = self._base_server.default_response_data(sr.response_size)
47      self._base_server.setup_send(response_data, event.stream_id)
48    # TODO (makdharma): Add assertion to check number of live streams
49