/
test_utils.py
78 lines (58 loc) · 2.04 KB
/
test_utils.py
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# Copyright 2020 Google LLC
#
# 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 threading
from typing import List, Union, Any, TypeVar, Generic, Optional, Callable
from asynctest import CoroutineMock
T = TypeVar("T")
async def async_iterable(elts: List[Union[Any, Exception]]):
for elt in elts:
if isinstance(elt, Exception):
raise elt
yield elt
def make_queue_waiter(
started_q: "asyncio.Queue[None]", result_q: "asyncio.Queue[Union[T, Exception]]"
):
"""
Given a queue to notify when started and a queue to get results from, return a waiter which
notifies started_q when started and returns from result_q when done.
"""
async def waiter(*args, **kwargs):
await started_q.put(None)
result = await result_q.get()
if isinstance(result, Exception):
raise result
return result
return waiter
class QueuePair:
called: asyncio.Queue
results: asyncio.Queue
def __init__(self):
self.called = asyncio.Queue()
self.results = asyncio.Queue()
def wire_queues(mock: CoroutineMock) -> QueuePair:
queues = QueuePair()
mock.side_effect = make_queue_waiter(queues.called, queues.results)
return queues
class Box(Generic[T]):
val: Optional[T]
def run_on_thread(func: Callable[[], T]) -> T:
box = Box()
def set_box():
box.val = func()
# Initialize watcher on another thread with a different event loop.
thread = threading.Thread(target=set_box)
thread.start()
thread.join()
return box.val