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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 concurrent.futures
import threading
import time
import mock
import pytest
from google.api_core import exceptions
from google.api_core.future import polling
class PollingFutureImpl(polling.PollingFuture):
def done(self):
return False
def cancel(self):
return True
def cancelled(self):
return False
def running(self):
return True
def test_polling_future_constructor():
future = PollingFutureImpl()
assert not future.done()
assert not future.cancelled()
assert future.running()
assert future.cancel()
def test_set_result():
future = PollingFutureImpl()
callback = mock.Mock()
future.set_result(1)
assert future.result() == 1
future.add_done_callback(callback)
callback.assert_called_once_with(future)
def test_set_exception():
future = PollingFutureImpl()
exception = ValueError("meep")
future.set_exception(exception)
assert future.exception() == exception
with pytest.raises(ValueError):
future.result()
callback = mock.Mock()
future.add_done_callback(callback)
callback.assert_called_once_with(future)
def test_invoke_callback_exception():
future = PollingFutureImplWithPoll()
future.set_result(42)
# This should not raise, despite the callback causing an exception.
callback = mock.Mock(side_effect=ValueError)
future.add_done_callback(callback)
callback.assert_called_once_with(future)
class PollingFutureImplWithPoll(PollingFutureImpl):
def __init__(self):
super(PollingFutureImplWithPoll, self).__init__()
self.poll_count = 0
self.event = threading.Event()
def done(self):
self.poll_count += 1
self.event.wait()
self.set_result(42)
return True
def test_result_with_polling():
future = PollingFutureImplWithPoll()
future.event.set()
result = future.result()
assert result == 42
assert future.poll_count == 1
# Repeated calls should not cause additional polling
assert future.result() == result
assert future.poll_count == 1
class PollingFutureImplTimeout(PollingFutureImplWithPoll):
def done(self):
time.sleep(1)
return False
def test_result_timeout():
future = PollingFutureImplTimeout()
with pytest.raises(concurrent.futures.TimeoutError):
future.result(timeout=1)
def test_exception_timeout():
future = PollingFutureImplTimeout()
with pytest.raises(concurrent.futures.TimeoutError):
future.exception(timeout=1)
class PollingFutureImplTransient(PollingFutureImplWithPoll):
def __init__(self, errors):
super(PollingFutureImplTransient, self).__init__()
self._errors = errors
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
def test_result_transient_error():
future = PollingFutureImplTransient(
(
exceptions.TooManyRequests,
exceptions.InternalServerError,
exceptions.BadGateway,
)
)
result = future.result()
assert result == 42
assert future.poll_count == 1
# Repeated calls should not cause additional polling
assert future.result() == result
assert future.poll_count == 1
def test_callback_background_thread():
future = PollingFutureImplWithPoll()
callback = mock.Mock()
future.add_done_callback(callback)
assert future._polling_thread is not None
# Give the thread a second to poll
time.sleep(1)
assert future.poll_count == 1
future.event.set()
future._polling_thread.join()
callback.assert_called_once_with(future)
def test_double_callback_background_thread():
future = PollingFutureImplWithPoll()
callback = mock.Mock()
callback2 = mock.Mock()
future.add_done_callback(callback)
current_thread = future._polling_thread
assert current_thread is not None
# only one polling thread should be created.
future.add_done_callback(callback2)
assert future._polling_thread is current_thread
future.event.set()
future._polling_thread.join()
assert future.poll_count == 1
callback.assert_called_once_with(future)
callback2.assert_called_once_with(future)
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