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# Copyright 2022 Google Inc.
#
# 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 mock
import pytest # type: ignore
from google.auth import _exponential_backoff
from google.auth import exceptions
@mock.patch("time.sleep", return_value=None)
def test_exponential_backoff(mock_time):
eb = _exponential_backoff.ExponentialBackoff()
curr_wait = eb._current_wait_in_seconds
iteration_count = 0
for attempt in eb:
if attempt == 1:
assert mock_time.call_count == 0
else:
backoff_interval = mock_time.call_args[0][0]
jitter = curr_wait * eb._randomization_factor
assert (curr_wait - jitter) <= backoff_interval <= (curr_wait + jitter)
assert attempt == iteration_count + 1
assert eb.backoff_count == iteration_count + 1
assert eb._current_wait_in_seconds == eb._multiplier ** iteration_count
curr_wait = eb._current_wait_in_seconds
iteration_count += 1
assert eb.total_attempts == _exponential_backoff._DEFAULT_RETRY_TOTAL_ATTEMPTS
assert eb.backoff_count == _exponential_backoff._DEFAULT_RETRY_TOTAL_ATTEMPTS
assert iteration_count == _exponential_backoff._DEFAULT_RETRY_TOTAL_ATTEMPTS
assert (
mock_time.call_count == _exponential_backoff._DEFAULT_RETRY_TOTAL_ATTEMPTS - 1
)
def test_minimum_total_attempts():
with pytest.raises(exceptions.InvalidValue):
_exponential_backoff.ExponentialBackoff(total_attempts=0)
with pytest.raises(exceptions.InvalidValue):
_exponential_backoff.ExponentialBackoff(total_attempts=-1)
_exponential_backoff.ExponentialBackoff(total_attempts=1)
@pytest.mark.asyncio
@mock.patch("asyncio.sleep", return_value=None)
async def test_exponential_backoff_async(mock_time_async):
eb = _exponential_backoff.AsyncExponentialBackoff()
curr_wait = eb._current_wait_in_seconds
iteration_count = 0
# Workaround issue in python 3.9 related to code coverage by adding `# pragma: no branch`
# See https://github.com/googleapis/gapic-generator-python/pull/1174#issuecomment-1025132372
async for attempt in eb: # pragma: no branch
if attempt == 1:
assert mock_time_async.call_count == 0
else:
backoff_interval = mock_time_async.call_args[0][0]
jitter = curr_wait * eb._randomization_factor
assert (curr_wait - jitter) <= backoff_interval <= (curr_wait + jitter)
assert attempt == iteration_count + 1
assert eb.backoff_count == iteration_count + 1
assert eb._current_wait_in_seconds == eb._multiplier ** iteration_count
curr_wait = eb._current_wait_in_seconds
iteration_count += 1
assert eb.total_attempts == _exponential_backoff._DEFAULT_RETRY_TOTAL_ATTEMPTS
assert eb.backoff_count == _exponential_backoff._DEFAULT_RETRY_TOTAL_ATTEMPTS
assert iteration_count == _exponential_backoff._DEFAULT_RETRY_TOTAL_ATTEMPTS
assert (
mock_time_async.call_count
== _exponential_backoff._DEFAULT_RETRY_TOTAL_ATTEMPTS - 1
)
def test_minimum_total_attempts_async():
with pytest.raises(exceptions.InvalidValue):
_exponential_backoff.AsyncExponentialBackoff(total_attempts=0)
with pytest.raises(exceptions.InvalidValue):
_exponential_backoff.AsyncExponentialBackoff(total_attempts=-1)
_exponential_backoff.AsyncExponentialBackoff(total_attempts=1)
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