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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
20
21class TestcaseSettingsMaxStreams(object):
22    """
23    This test sets MAX_CONCURRENT_STREAMS to 1 and asserts that at any point
24    only 1 stream is active.
25  """
26
27    def __init__(self):
28        self._base_server = http2_base_server.H2ProtocolBaseServer()
29        self._base_server._handlers['DataReceived'] = self.on_data_received
30        self._base_server._handlers['ConnectionMade'] = self.on_connection_made
31
32    def get_base_server(self):
33        return self._base_server
34
35    def on_connection_made(self):
36        logging.info('Connection Made')
37        self._base_server._conn.initiate_connection()
38        self._base_server._conn.update_settings(
39            {hyperframe.frame.SettingsFrame.MAX_CONCURRENT_STREAMS: 1})
40        self._base_server.transport.setTcpNoDelay(True)
41        self._base_server.transport.write(
42            self._base_server._conn.data_to_send())
43
44    def on_data_received(self, event):
45        self._base_server.on_data_received_default(event)
46        sr = self._base_server.parse_received_data(event.stream_id)
47        if sr:
48            logging.info('Creating response of size = %s' % sr.response_size)
49            response_data = self._base_server.default_response_data(
50                sr.response_size)
51            self._base_server.setup_send(response_data, event.stream_id)
52        # TODO (makdharma): Add assertion to check number of live streams
53