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# Copyright 2018 gRPC authors.
#
# 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.
"""Test of gRPC Python's interaction with the python logging module"""
import unittest
import six
from six.moves import reload_module
import logging
import grpc
import functools
import sys
def patch_stderr(f):
@functools.wraps(f)
def _impl(*args, **kwargs):
old_stderr = sys.stderr
sys.stderr = six.StringIO()
try:
f(*args, **kwargs)
finally:
sys.stderr = old_stderr
return _impl
def isolated_logging(f):
@functools.wraps(f)
def _impl(*args, **kwargs):
reload_module(logging)
reload_module(grpc)
try:
f(*args, **kwargs)
finally:
reload_module(logging)
return _impl
class LoggingTest(unittest.TestCase):
@isolated_logging
def test_logger_not_occupied(self):
self.assertEqual(0, len(logging.getLogger().handlers))
@patch_stderr
@isolated_logging
def test_handler_found(self):
self.assertEqual(0, len(sys.stderr.getvalue()))
@isolated_logging
def test_can_configure_logger(self):
intended_stream = six.StringIO()
logging.basicConfig(stream=intended_stream)
self.assertEqual(1, len(logging.getLogger().handlers))
self.assertIs(logging.getLogger().handlers[0].stream, intended_stream)
@isolated_logging
def test_grpc_logger(self):
self.assertIn("grpc", logging.Logger.manager.loggerDict)
root_logger = logging.getLogger("grpc")
self.assertEqual(1, len(root_logger.handlers))
self.assertIsInstance(root_logger.handlers[0], logging.NullHandler)
if __name__ == '__main__':
unittest.main(verbosity=2)
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