# Copyright 2016 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import hyperframe.frame
import logging

import http2_base_server

class TestcaseSettingsMaxStreams(object):
  """
    This test sets MAX_CONCURRENT_STREAMS to 1 and asserts that at any point
    only 1 stream is active.
  """
  def __init__(self):
    self._base_server = http2_base_server.H2ProtocolBaseServer()
    self._base_server._handlers['DataReceived'] = self.on_data_received
    self._base_server._handlers['ConnectionMade'] = self.on_connection_made

  def get_base_server(self):
    return self._base_server

  def on_connection_made(self):
    logging.info('Connection Made')
    self._base_server._conn.initiate_connection()
    self._base_server._conn.update_settings(
                  {hyperframe.frame.SettingsFrame.MAX_CONCURRENT_STREAMS: 1})
    self._base_server.transport.setTcpNoDelay(True)
    self._base_server.transport.write(self._base_server._conn.data_to_send())

  def on_data_received(self, event):
    self._base_server.on_data_received_default(event)
    sr = self._base_server.parse_received_data(event.stream_id)
    if sr:
      logging.info('Creating response of size = %s' % sr.response_size)
      response_data = self._base_server.default_response_data(sr.response_size)
      self._base_server.setup_send(response_data, event.stream_id)
    # TODO (makdharma): Add assertion to check number of live streams