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# Copyright (c) 2008-2014 Simplistix Ltd
# See license.txt for license details.
from collections import defaultdict
import atexit
import logging
import warnings
from testfixtures.comparison import compare
from testfixtures.utils import wrap
class LogCapture(logging.Handler):
"""
These are used to capture entries logged to the Python logging
framework and make assertions about what was logged.
:param names: A string (or tuple of strings) containing the dotted name(s)
of loggers to capture. By default, the root logger is
captured.
:param install: If `True`, the :class:`LogCapture` will be
installed as part of its instantiation.
:param propagate: If specified, any captured loggers will have their
`propagate` attribute set to the supplied value. This can
be used to prevent propagation from a child logger to a
parent logger that has configured handlers.
:param attributes:
The sequence of attribute names to return for each record or a callable
that extracts a row from a record..
If a sequence of attribute names, those attributes will be taken from the
:class:`~logging.LogRecord`. If an attribute is callable, the value
used will be the result of calling it. If an attribute is missing,
``None`` will be used in its place.
If a callable, it will be called with the :class:`~logging.LogRecord`
and the value returned will be used as the row..
:param recursive_check:
If ``True``, log messages will be compared recursively by
:meth:`LogCapture.check`.
"""
instances = set()
atexit_setup = False
installed = False
def __init__(self, names=None, install=True, level=1, propagate=None,
attributes=('name', 'levelname', 'getMessage'),
recursive_check=False):
logging.Handler.__init__(self)
if not isinstance(names, tuple):
names = (names, )
self.names = names
self.level = level
self.propagate = propagate
self.attributes = attributes
self.recursive_check = recursive_check
self.old = defaultdict(dict)
self.clear()
if install:
self.install()
@classmethod
def atexit(cls):
if cls.instances:
warnings.warn(
'LogCapture instances not uninstalled by shutdown, '
'loggers captured:\n'
'%s' % ('\n'.join((str(i.names) for i in cls.instances)))
)
def clear(self):
"Clear any entries that have been captured."
self.records = []
def emit(self, record):
self.records.append(record)
def install(self):
"""
Install this :class:`LogHandler` into the Python logging
framework for the named loggers.
This will remove any existing handlers for those loggers and
drop their level to 1 in order to capture all logging.
"""
for name in self.names:
logger = logging.getLogger(name)
self.old['levels'][name] = logger.level
self.old['handlers'][name] = logger.handlers
self.old['disabled'][name] = logger.disabled
self.old['progagate'][name] = logger.propagate
logger.setLevel(self.level)
logger.handlers = [self]
logger.disabled = False
if self.propagate is not None:
logger.propagate = self.propagate
self.instances.add(self)
if not self.__class__.atexit_setup:
atexit.register(self.atexit)
self.__class__.atexit_setup = True
def uninstall(self):
"""
Un-install this :class:`LogHandler` from the Python logging
framework for the named loggers.
This will re-instate any existing handlers for those loggers
that were removed during installation and retore their level
that prior to installation.
"""
if self in self.instances:
for name in self.names:
logger = logging.getLogger(name)
logger.setLevel(self.old['levels'][name])
logger.handlers = self.old['handlers'][name]
logger.disabled = self.old['disabled'][name]
logger.propagate = self.old['progagate'][name]
self.instances.remove(self)
@classmethod
def uninstall_all(cls):
"This will uninstall all existing :class:`LogHandler` objects."
for i in tuple(cls.instances):
i.uninstall()
def _actual_row(self, record):
for a in self.attributes:
value = getattr(record, a, None)
if callable(value):
value = value()
yield value
def actual(self):
for r in self.records:
if callable(self.attributes):
yield self.attributes(r)
else:
result = tuple(self._actual_row(r))
if len(result) == 1:
yield result[0]
else:
yield result
def __str__(self):
if not self.records:
return 'No logging captured'
return '\n'.join(["%s %s\n %s" % r for r in self.actual()])
def check(self, *expected):
"""
This will compare the captured entries with the expected
entries provided and raise an :class:`AssertionError` if they
do not match.
:param expected: A sequence of 3-tuples containing the
expected log entries. Each tuple should be of
the form (logger_name, string_level, message)
"""
return compare(
expected,
actual=tuple(self.actual()),
recursive=self.recursive_check
)
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
self.uninstall()
class LogCaptureForDecorator(LogCapture):
def install(self):
LogCapture.install(self)
return self
def log_capture(*names, **kw):
"""
A decorator for making a :class:`LogCapture` installed an
available for the duration of a test function.
:param names: An optional sequence of names specifying the loggers
to be captured. If not specified, the root logger
will be captured.
Keyword parameters other than ``install`` may also be supplied and will be
passed on to the :class:`LogCapture` constructor.
"""
l = LogCaptureForDecorator(names or None, install=False, **kw)
return wrap(l.install, l.uninstall)