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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 logging
import grpc
import subprocess
import sys
INTERPRETER = sys.executable
class LoggingTest(unittest.TestCase):
def test_logger_not_occupied(self):
script = """if True:
import logging
import grpc
if len(logging.getLogger().handlers) != 0:
raise Exception('expected 0 logging handlers')
"""
self._verifyScriptSucceeds(script)
def test_handler_found(self):
script = """if True:
import logging
import grpc
"""
out, err = self._verifyScriptSucceeds(script)
self.assertEqual(0, len(err), 'unexpected output to stderr')
def test_can_configure_logger(self):
script = """if True:
import logging
import six
import grpc
intended_stream = six.StringIO()
logging.basicConfig(stream=intended_stream)
if len(logging.getLogger().handlers) != 1:
raise Exception('expected 1 logging handler')
if logging.getLogger().handlers[0].stream is not intended_stream:
raise Exception('wrong handler stream')
"""
self._verifyScriptSucceeds(script)
def test_grpc_logger(self):
script = """if True:
import logging
import grpc
if "grpc" not in logging.Logger.manager.loggerDict:
raise Exception('grpc logger not found')
root_logger = logging.getLogger("grpc")
if len(root_logger.handlers) != 1:
raise Exception('expected 1 root logger handler')
if not isinstance(root_logger.handlers[0], logging.NullHandler):
raise Exception('expected logging.NullHandler')
"""
self._verifyScriptSucceeds(script)
def _verifyScriptSucceeds(self, script):
process = subprocess.Popen(
[INTERPRETER, '-c', script],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out, err = process.communicate()
self.assertEqual(
0, process.returncode,
'process failed with exit code %d (stdout: %s, stderr: %s)' %
(process.returncode, out, err))
return out, err
if __name__ == '__main__':
unittest.main(verbosity=2)
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