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# Copyright 2016, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import time
import threading
import unittest

from grpc._cython import cygrpc

from tests.unit.framework.common import test_constants


def _channel_and_completion_queue():
  channel = cygrpc.Channel('localhost:54321', cygrpc.ChannelArgs(()))
  completion_queue = cygrpc.CompletionQueue()
  return channel, completion_queue


def _connectivity_loop(channel, completion_queue):
  for _ in range(100):
    connectivity = channel.check_connectivity_state(True)
    channel.watch_connectivity_state(
        connectivity, cygrpc.Timespec(time.time() + 0.2), completion_queue,
        None)
    completion_queue.poll(deadline=cygrpc.Timespec(float('+inf')))


def _create_loop_destroy():
  channel, completion_queue = _channel_and_completion_queue()
  _connectivity_loop(channel, completion_queue)
  completion_queue.shutdown()


def _in_parallel(behavior, arguments):
  threads = tuple(
      threading.Thread(target=behavior, args=arguments)
      for _ in range(test_constants.THREAD_CONCURRENCY))
  for thread in threads:
    thread.start()
  for thread in threads:
    thread.join()


class ChannelTest(unittest.TestCase):

  def test_single_channel_lonely_connectivity(self):
    channel, completion_queue = _channel_and_completion_queue()
    _in_parallel(_connectivity_loop, (channel, completion_queue,))
    completion_queue.shutdown()

  def test_multiple_channels_lonely_connectivity(self):
    _in_parallel(_create_loop_destroy, ())


if __name__ == '__main__':
  unittest.main(verbosity=2)