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# Copyright 2017, 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 mock
import pytest
from google.api_core import exceptions
from google.api_core.future import async_future
class AsyncFuture(async_future.AsyncFuture):
async def done(self):
return False
async def cancel(self):
return True
async def cancelled(self):
return False
async def running(self):
return True
@pytest.mark.asyncio
async def test_polling_future_constructor():
future = AsyncFuture()
assert not await future.done()
assert not await future.cancelled()
assert await future.running()
assert await future.cancel()
@pytest.mark.asyncio
async def test_set_result():
future = AsyncFuture()
callback = mock.Mock()
future.set_result(1)
assert await future.result() == 1
callback_called = asyncio.Event()
def callback(unused_future):
callback_called.set()
future.add_done_callback(callback)
await callback_called.wait()
@pytest.mark.asyncio
async def test_set_exception():
future = AsyncFuture()
exception = ValueError("meep")
future.set_exception(exception)
assert await future.exception() == exception
with pytest.raises(ValueError):
await future.result()
callback_called = asyncio.Event()
def callback(unused_future):
callback_called.set()
future.add_done_callback(callback)
await callback_called.wait()
@pytest.mark.asyncio
async def test_invoke_callback_exception():
future = AsyncFuture()
future.set_result(42)
# This should not raise, despite the callback causing an exception.
callback_called = asyncio.Event()
def callback(unused_future):
callback_called.set()
raise ValueError()
future.add_done_callback(callback)
await callback_called.wait()
class AsyncFutureWithPoll(AsyncFuture):
def __init__(self):
super().__init__()
self.poll_count = 0
self.event = asyncio.Event()
async def done(self):
self.poll_count += 1
await self.event.wait()
self.set_result(42)
return True
@pytest.mark.asyncio
async def test_result_with_polling():
future = AsyncFutureWithPoll()
future.event.set()
result = await future.result()
assert result == 42
assert future.poll_count == 1
# Repeated calls should not cause additional polling
assert await future.result() == result
assert future.poll_count == 1
class AsyncFutureTimeout(AsyncFutureWithPoll):
async def done(self):
await asyncio.sleep(0.2)
return False
@pytest.mark.asyncio
async def test_result_timeout():
future = AsyncFutureTimeout()
with pytest.raises(asyncio.TimeoutError):
await future.result(timeout=0.2)
@pytest.mark.asyncio
async def test_exception_timeout():
future = AsyncFutureTimeout()
with pytest.raises(asyncio.TimeoutError):
await future.exception(timeout=0.2)
@pytest.mark.asyncio
async def test_result_timeout_with_retry():
future = AsyncFutureTimeout()
with pytest.raises(asyncio.TimeoutError):
await future.exception(timeout=0.4)
class AsyncFutureTransient(AsyncFutureWithPoll):
def __init__(self, errors):
super().__init__()
self._errors = errors
async def done(self):
if self._errors:
error, self._errors = self._errors[0], self._errors[1:]
raise error("testing")
self.poll_count += 1
self.set_result(42)
return True
@mock.patch("asyncio.sleep", autospec=True)
@pytest.mark.asyncio
async def test_result_transient_error(unused_sleep):
future = AsyncFutureTransient(
(
exceptions.TooManyRequests,
exceptions.InternalServerError,
exceptions.BadGateway,
)
)
result = await future.result()
assert result == 42
assert future.poll_count == 1
# Repeated calls should not cause additional polling
assert await future.result() == result
assert future.poll_count == 1
@pytest.mark.asyncio
async def test_callback_concurrency():
future = AsyncFutureWithPoll()
callback_called = asyncio.Event()
def callback(unused_future):
callback_called.set()
future.add_done_callback(callback)
# Give the thread a second to poll
await asyncio.sleep(1)
assert future.poll_count == 1
future.event.set()
await callback_called.wait()
@pytest.mark.asyncio
async def test_double_callback_concurrency():
future = AsyncFutureWithPoll()
callback_called = asyncio.Event()
def callback(unused_future):
callback_called.set()
callback_called2 = asyncio.Event()
def callback2(unused_future):
callback_called2.set()
future.add_done_callback(callback)
future.add_done_callback(callback2)
# Give the thread a second to poll
await asyncio.sleep(1)
future.event.set()
assert future.poll_count == 1
await callback_called.wait()
await callback_called2.wait()
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