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# Copyright 2019 The 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 asyncio
import functools
import logging
from typing import Callable
import unittest
from grpc.experimental import aio
__all__ = 'AioTestBase'
_COROUTINE_FUNCTION_ALLOWLIST = ['setUp', 'tearDown']
def _async_to_sync_decorator(f: Callable, loop: asyncio.AbstractEventLoop):
@functools.wraps(f)
def wrapper(*args, **kwargs):
return loop.run_until_complete(f(*args, **kwargs))
return wrapper
def _get_default_loop(debug=True):
try:
loop = asyncio.get_event_loop()
except:
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
finally:
loop.set_debug(debug)
return loop
# NOTE(gnossen) this test class can also be implemented with metaclass.
class AioTestBase(unittest.TestCase):
# NOTE(lidi) We need to pick a loop for entire testing phase, otherwise it
# will trigger create new loops in new threads, leads to deadlock.
_TEST_LOOP = _get_default_loop()
@property
def loop(self):
return self._TEST_LOOP
def __getattribute__(self, name):
"""Overrides the loading logic to support coroutine functions."""
attr = super().__getattribute__(name)
# If possible, converts the coroutine into a sync function.
if name.startswith('test_') or name in _COROUTINE_FUNCTION_ALLOWLIST:
if asyncio.iscoroutinefunction(attr):
return _async_to_sync_decorator(attr, self._TEST_LOOP)
# For other attributes, let them pass.
return attr
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