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# Copyright 2017 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 http.client
import mock
import pytest # type: ignore
from google._async_resumable_media import _helpers
from google.resumable_media import common
def test_do_nothing():
ret_val = _helpers.do_nothing()
assert ret_val is None
class Test_header_required(object):
def _success_helper(self, **kwargs):
name = "some-header"
value = "The Right Hand Side"
headers = {name: value, "other-name": "other-value"}
response = mock.Mock(
_headers=headers, headers=headers, spec=["_headers", "headers"]
)
result = _helpers.header_required(response, name, _get_headers, **kwargs)
assert result == value
def test_success(self):
self._success_helper()
def test_success_with_callback(self):
callback = mock.Mock(spec=[])
self._success_helper(callback=callback)
callback.assert_not_called()
def _failure_helper(self, **kwargs):
response = mock.Mock(_headers={}, headers={}, spec=["_headers", "headers"])
name = "any-name"
with pytest.raises(common.InvalidResponse) as exc_info:
_helpers.header_required(response, name, _get_headers, **kwargs)
error = exc_info.value
assert error.response is response
assert len(error.args) == 2
assert error.args[1] == name
def test_failure(self):
self._failure_helper()
def test_failure_with_callback(self):
callback = mock.Mock(spec=[])
self._failure_helper(callback=callback)
callback.assert_called_once_with()
class Test_require_status_code(object):
@staticmethod
def _get_status_code(response):
return response.status_code
def test_success(self):
status_codes = (http.client.OK, http.client.CREATED)
acceptable = (
http.client.OK,
int(http.client.OK),
http.client.CREATED,
int(http.client.CREATED),
)
for value in acceptable:
response = _make_response(value)
status_code = _helpers.require_status_code(
response, status_codes, self._get_status_code
)
assert value == status_code
def test_success_with_callback(self):
status_codes = (http.client.OK,)
response = _make_response(http.client.OK)
callback = mock.Mock(spec=[])
status_code = _helpers.require_status_code(
response, status_codes, self._get_status_code, callback=callback
)
assert status_code == http.client.OK
callback.assert_not_called()
def test_failure(self):
status_codes = (http.client.CREATED, http.client.NO_CONTENT)
response = _make_response(http.client.OK)
with pytest.raises(common.InvalidResponse) as exc_info:
_helpers.require_status_code(response, status_codes, self._get_status_code)
error = exc_info.value
assert error.response is response
assert len(error.args) == 5
assert error.args[1] == response.status_code
assert error.args[3:] == status_codes
def test_failure_with_callback(self):
status_codes = (http.client.OK,)
response = _make_response(http.client.NOT_FOUND)
callback = mock.Mock(spec=[])
with pytest.raises(common.InvalidResponse) as exc_info:
_helpers.require_status_code(
response, status_codes, self._get_status_code, callback=callback
)
error = exc_info.value
assert error.response is response
assert len(error.args) == 4
assert error.args[1] == response.status_code
assert error.args[3:] == status_codes
callback.assert_called_once_with()
class Test_calculate_retry_wait(object):
@mock.patch("random.randint", return_value=125)
def test_past_limit(self, randint_mock):
base_wait, wait_time = _helpers.calculate_retry_wait(70.0, 64.0)
assert base_wait == 64.0
assert wait_time == 64.125
randint_mock.assert_called_once_with(0, 1000)
@mock.patch("random.randint", return_value=250)
def test_at_limit(self, randint_mock):
base_wait, wait_time = _helpers.calculate_retry_wait(50.0, 50.0)
assert base_wait == 50.0
assert wait_time == 50.25
randint_mock.assert_called_once_with(0, 1000)
@mock.patch("random.randint", return_value=875)
def test_under_limit(self, randint_mock):
base_wait, wait_time = _helpers.calculate_retry_wait(16.0, 33.0)
assert base_wait == 32.0
assert wait_time == 32.875
randint_mock.assert_called_once_with(0, 1000)
class Test_wait_and_retry(object):
@pytest.mark.asyncio
async def test_success_no_retry(self):
truthy = http.client.OK
assert truthy not in common.RETRYABLE
response = _make_response(truthy)
func = mock.AsyncMock(return_value=response, spec=[])
retry_strategy = common.RetryStrategy()
ret_val = await _helpers.wait_and_retry(func, _get_status_code, retry_strategy)
assert ret_val is response
func.assert_called_once_with()
@mock.patch("time.sleep")
@mock.patch("random.randint")
@pytest.mark.asyncio
async def test_success_with_retry(self, randint_mock, sleep_mock):
randint_mock.side_effect = [125, 625, 375]
status_codes = (
http.client.INTERNAL_SERVER_ERROR,
http.client.BAD_GATEWAY,
http.client.SERVICE_UNAVAILABLE,
http.client.NOT_FOUND,
)
responses = [_make_response(status_code) for status_code in status_codes]
func = mock.AsyncMock(side_effect=responses, spec=[])
retry_strategy = common.RetryStrategy()
ret_val = await _helpers.wait_and_retry(func, _get_status_code, retry_strategy)
assert ret_val == responses[-1]
assert status_codes[-1] not in common.RETRYABLE
assert func.call_count == 4
assert func.mock_calls == [mock.call()] * 4
assert randint_mock.call_count == 3
assert randint_mock.mock_calls == [mock.call(0, 1000)] * 3
assert sleep_mock.call_count == 3
sleep_mock.assert_any_call(1.125)
sleep_mock.assert_any_call(2.625)
sleep_mock.assert_any_call(4.375)
@mock.patch("time.sleep")
@mock.patch("random.randint")
@pytest.mark.asyncio
async def test_success_with_retry_connection_error(self, randint_mock, sleep_mock):
randint_mock.side_effect = [125, 625, 375]
response = _make_response(http.client.NOT_FOUND)
responses = [ConnectionError, ConnectionError, ConnectionError, response]
func = mock.AsyncMock(side_effect=responses, spec=[])
retry_strategy = common.RetryStrategy()
ret_val = await _helpers.wait_and_retry(func, _get_status_code, retry_strategy)
assert ret_val == responses[-1]
assert func.call_count == 4
assert func.mock_calls == [mock.call()] * 4
assert randint_mock.call_count == 3
assert randint_mock.mock_calls == [mock.call(0, 1000)] * 3
assert sleep_mock.call_count == 3
sleep_mock.assert_any_call(1.125)
sleep_mock.assert_any_call(2.625)
sleep_mock.assert_any_call(4.375)
@mock.patch("time.sleep")
@mock.patch("random.randint")
@pytest.mark.asyncio
async def test_retry_exceeded_reraises_connection_error(
self, randint_mock, sleep_mock
):
randint_mock.side_effect = [875, 0, 375, 500, 500, 250, 125]
responses = [ConnectionError] * 8
func = mock.AsyncMock(side_effect=responses, spec=[])
retry_strategy = common.RetryStrategy(max_cumulative_retry=100.0)
with pytest.raises(ConnectionError):
await _helpers.wait_and_retry(func, _get_status_code, retry_strategy)
assert func.call_count == 8
assert func.mock_calls == [mock.call()] * 8
assert randint_mock.call_count == 7
assert randint_mock.mock_calls == [mock.call(0, 1000)] * 7
assert sleep_mock.call_count == 7
sleep_mock.assert_any_call(1.875)
sleep_mock.assert_any_call(2.0)
sleep_mock.assert_any_call(4.375)
sleep_mock.assert_any_call(8.5)
sleep_mock.assert_any_call(16.5)
sleep_mock.assert_any_call(32.25)
sleep_mock.assert_any_call(64.125)
@mock.patch("time.sleep")
@mock.patch("random.randint")
@pytest.mark.asyncio
async def test_retry_exceeds_max_cumulative(self, randint_mock, sleep_mock):
randint_mock.side_effect = [875, 0, 375, 500, 500, 250, 125]
status_codes = (
http.client.SERVICE_UNAVAILABLE,
http.client.GATEWAY_TIMEOUT,
http.client.TOO_MANY_REQUESTS,
http.client.INTERNAL_SERVER_ERROR,
http.client.SERVICE_UNAVAILABLE,
http.client.BAD_GATEWAY,
http.client.GATEWAY_TIMEOUT,
http.client.TOO_MANY_REQUESTS,
)
responses = [_make_response(status_code) for status_code in status_codes]
func = mock.AsyncMock(side_effect=responses, spec=[])
retry_strategy = common.RetryStrategy(max_cumulative_retry=100.0)
ret_val = await _helpers.wait_and_retry(func, _get_status_code, retry_strategy)
assert ret_val == responses[-1]
assert status_codes[-1] in common.RETRYABLE
assert func.call_count == 8
assert func.mock_calls == [mock.call()] * 8
assert randint_mock.call_count == 7
assert randint_mock.mock_calls == [mock.call(0, 1000)] * 7
assert sleep_mock.call_count == 7
sleep_mock.assert_any_call(1.875)
sleep_mock.assert_any_call(2.0)
sleep_mock.assert_any_call(4.375)
sleep_mock.assert_any_call(8.5)
sleep_mock.assert_any_call(16.5)
sleep_mock.assert_any_call(32.25)
sleep_mock.assert_any_call(64.125)
def _make_response(status_code):
return mock.AsyncMock(status_code=status_code, spec=["status_code"])
def _get_status_code(response):
return response.status_code
def _get_headers(response):
return response._headers
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