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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 cStringIO import StringIO
from testtools.content import Content
from testtools.content_type import UTF8_TEXT
from fixtures import Fixture
__all__ = [
'FakeLogger',
'LoggerFixture',
]
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()
output = StringIO()
self.addDetail(
u"pythonlogging:'%s'" % self._name,
Content(UTF8_TEXT, lambda: [output.getvalue()]))
self._output = output
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):
logger.removeHandler(handler)
self.addCleanup(logger.addHandler, handler)
handler = StreamHandler(output)
if self._format:
handler.setFormatter(Formatter(self._format))
try:
logger.addHandler(handler)
finally:
self.addCleanup(logger.removeHandler, handler)
@property
def output(self):
return self._output.getvalue()
LoggerFixture = FakeLogger
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