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# fixtures: Fixtures with cleanups for testing and convenience.
#
# Copyright (c) 2011, Robert Collins <robertc@robertcollins.net>
#
# Licensed under either the Apache License, Version 2.0 or the BSD 3-clause
# license at the users choice. A copy of both licenses are available in the
# project source as Apache-2.0 and BSD. You may not use this file except in
# compliance with one of these two licences.
#
# Unless required by applicable law or agreed to in writing, software
# distributed under these licenses is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# license you chose for the specific language governing permissions and
# limitations under that license.
from logging import StreamHandler, getLogger, INFO, Formatter
from testtools.compat import _u
from fixtures import Fixture
from fixtures._fixtures.streams import StringStream
__all__ = [
'FakeLogger',
'LoggerFixture',
'LogHandler',
]
class LogHandler(Fixture):
"""Replace a logger's handlers."""
def __init__(self, handler, name="", level=None, nuke_handlers=True):
"""Create a LogHandler fixture.
:param handler: The handler to replace other handlers with.
If nuke_handlers is False, then added as an extra handler.
:param name: The name of the logger to replace. Defaults to "".
:param level: The log level to set, defaults to not changing the level.
:param nuke_handlers: If True remove all existing handles (prevents
existing messages going to e.g. stdout). Defaults to True.
"""
super(LogHandler, self).__init__()
self.handler = handler
self._name = name
self._level = level
self._nuke_handlers = nuke_handlers
def setUp(self):
super(LogHandler, self).setUp()
logger = getLogger(self._name)
if self._level:
self.addCleanup(logger.setLevel, logger.level)
logger.setLevel(self._level)
if self._nuke_handlers:
for handler in reversed(logger.handlers):
self.addCleanup(logger.addHandler, handler)
logger.removeHandler(handler)
try:
logger.addHandler(self.handler)
finally:
self.addCleanup(logger.removeHandler, self.handler)
class FakeLogger(Fixture):
"""Replace a logger and capture its output."""
def __init__(self, name="", level=INFO, format=None, nuke_handlers=True):
"""Create a FakeLogger fixture.
:param name: The name of the logger to replace. Defaults to "".
:param level: The log level to set, defaults to INFO.
:param format: Logging format to use. Defaults to capturing supplied
messages verbatim.
:param nuke_handlers: If True remove all existing handles (prevents
existing messages going to e.g. stdout). Defaults to True.
Example:
def test_log(self)
fixture = self.useFixture(LoggerFixture())
logging.info('message')
self.assertEqual('message', fixture.output)
"""
super(FakeLogger, self).__init__()
self._name = name
self._level = level
self._format = format
self._nuke_handlers = nuke_handlers
def setUp(self):
super(FakeLogger, self).setUp()
name = _u("pythonlogging:'%s'") % self._name
output = self.useFixture(StringStream(name)).stream
self._output = output
handler = StreamHandler(output)
if self._format:
handler.setFormatter(Formatter(self._format))
self.useFixture(
LogHandler(handler, name=self._name, level=self._level,
nuke_handlers=self._nuke_handlers))
@property
def output(self):
self._output.seek(0)
return self._output.read()
LoggerFixture = FakeLogger
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