mirror of
https://github.com/thegeeklab/ansible-later.git
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274 lines
9.3 KiB
Python
274 lines
9.3 KiB
Python
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from collections import defaultdict
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import atexit
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import logging
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import warnings
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from pprint import pformat
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from testfixtures.comparison import compare
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from testfixtures.utils import wrap
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class LogCapture(logging.Handler):
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"""
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These are used to capture entries logged to the Python logging
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framework and make assertions about what was logged.
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:param names: A string (or tuple of strings) containing the dotted name(s)
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of loggers to capture. By default, the root logger is
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captured.
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:param install: If `True`, the :class:`LogCapture` will be
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installed as part of its instantiation.
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:param propagate: If specified, any captured loggers will have their
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`propagate` attribute set to the supplied value. This can
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be used to prevent propagation from a child logger to a
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parent logger that has configured handlers.
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:param attributes:
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The sequence of attribute names to return for each record or a callable
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that extracts a row from a record.
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If a sequence of attribute names, those attributes will be taken from the
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:class:`~logging.LogRecord`. If an attribute is callable, the value
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used will be the result of calling it. If an attribute is missing,
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``None`` will be used in its place.
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If a callable, it will be called with the :class:`~logging.LogRecord`
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and the value returned will be used as the row..
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:param recursive_check:
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If ``True``, log messages will be compared recursively by
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:meth:`LogCapture.check`.
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"""
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instances = set()
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atexit_setup = False
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installed = False
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def __init__(self, names=None, install=True, level=1, propagate=None,
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attributes=('name', 'levelname', 'getMessage'),
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recursive_check=False):
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logging.Handler.__init__(self)
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if not isinstance(names, tuple):
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names = (names, )
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self.names = names
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self.level = level
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self.propagate = propagate
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self.attributes = attributes
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self.recursive_check = recursive_check
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self.old = defaultdict(dict)
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self.clear()
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if install:
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self.install()
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@classmethod
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def atexit(cls):
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if cls.instances:
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warnings.warn(
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'LogCapture instances not uninstalled by shutdown, '
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'loggers captured:\n'
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'%s' % ('\n'.join((str(i.names) for i in cls.instances)))
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)
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def clear(self):
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"Clear any entries that have been captured."
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self.records = []
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def emit(self, record):
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self.records.append(record)
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def install(self):
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"""
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Install this :class:`LogHandler` into the Python logging
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framework for the named loggers.
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This will remove any existing handlers for those loggers and
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drop their level to that specified on this :class:`LogCapture` in order
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to capture all logging.
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"""
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for name in self.names:
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logger = logging.getLogger(name)
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self.old['levels'][name] = logger.level
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self.old['handlers'][name] = logger.handlers
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self.old['disabled'][name] = logger.disabled
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self.old['progagate'][name] = logger.propagate
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logger.setLevel(self.level)
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logger.handlers = [self]
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logger.disabled = False
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if self.propagate is not None:
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logger.propagate = self.propagate
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self.instances.add(self)
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if not self.__class__.atexit_setup:
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atexit.register(self.atexit)
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self.__class__.atexit_setup = True
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def uninstall(self):
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"""
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Un-install this :class:`LogHandler` from the Python logging
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framework for the named loggers.
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This will re-instate any existing handlers for those loggers
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that were removed during installation and restore their level
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that prior to installation.
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"""
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if self in self.instances:
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for name in self.names:
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logger = logging.getLogger(name)
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logger.setLevel(self.old['levels'][name])
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logger.handlers = self.old['handlers'][name]
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logger.disabled = self.old['disabled'][name]
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logger.propagate = self.old['progagate'][name]
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self.instances.remove(self)
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@classmethod
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def uninstall_all(cls):
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"This will uninstall all existing :class:`LogHandler` objects."
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for i in tuple(cls.instances):
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i.uninstall()
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def _actual_row(self, record):
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for a in self.attributes:
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value = getattr(record, a, None)
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if callable(value):
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value = value()
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yield value
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def actual(self):
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"""
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The sequence of actual records logged, having had their attributes
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extracted as specified by the ``attributes`` parameter to the
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:class:`LogCapture` constructor.
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This can be useful for making more complex assertions about logged
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records. The actual records logged can also be inspected by using the
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:attr:`records` attribute.
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"""
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actual = []
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for r in self.records:
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if callable(self.attributes):
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actual.append(self.attributes(r))
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else:
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result = tuple(self._actual_row(r))
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if len(result) == 1:
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actual.append(result[0])
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else:
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actual.append(result)
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return actual
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def __str__(self):
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if not self.records:
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return 'No logging captured'
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return '\n'.join(["%s %s\n %s" % r for r in self.actual()])
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def check(self, *expected):
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"""
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This will compare the captured entries with the expected
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entries provided and raise an :class:`AssertionError` if they
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do not match.
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:param expected:
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A sequence of entries of the structure specified by the ``attributes``
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passed to the constructor.
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"""
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return compare(
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expected,
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actual=self.actual(),
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recursive=self.recursive_check
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)
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def check_present(self, *expected, **kw):
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"""
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This will check if the captured entries contain all of the expected
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entries provided and raise an :class:`AssertionError` if not.
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This will ignore entries that have been captured but that do not
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match those in ``expected``.
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:param expected:
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A sequence of entries of the structure specified by the ``attributes``
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passed to the constructor.
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:param order_matters:
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A keyword-only parameter that controls whether the order of the
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captured entries is required to match those of the expected entries.
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Defaults to ``True``.
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"""
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order_matters = kw.pop('order_matters', True)
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assert not kw, 'order_matters is the only keyword parameter'
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actual = self.actual()
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if order_matters:
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matched_indices = [0]
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matched = []
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for entry in expected:
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try:
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index = actual.index(entry, matched_indices[-1])
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except ValueError:
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if len(matched_indices) > 1:
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matched_indices.pop()
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matched.pop()
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break
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else:
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matched_indices.append(index+1)
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matched.append(entry)
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else:
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return
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compare(expected,
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actual=matched+actual[matched_indices[-1]:],
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recursive=self.recursive_check)
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else:
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expected = list(expected)
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matched = []
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unmatched = []
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for entry in actual:
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try:
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index = expected.index(entry)
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except ValueError:
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unmatched.append(entry)
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else:
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matched.append(expected.pop(index))
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if not expected:
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break
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if expected:
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raise AssertionError((
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'entries not as expected:\n\n'
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'expected and found:\n%s\n\n'
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'expected but not found:\n%s\n\n'
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'other entries:\n%s'
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) % (pformat(matched), pformat(expected), pformat(unmatched)))
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def __enter__(self):
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return self
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def __exit__(self, type, value, traceback):
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self.uninstall()
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class LogCaptureForDecorator(LogCapture):
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def install(self):
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LogCapture.install(self)
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self.clear()
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return self
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def log_capture(*names, **kw):
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"""
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A decorator for making a :class:`LogCapture` installed an
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available for the duration of a test function.
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:param names: An optional sequence of names specifying the loggers
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to be captured. If not specified, the root logger
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will be captured.
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Keyword parameters other than ``install`` may also be supplied and will be
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passed on to the :class:`LogCapture` constructor.
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"""
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l = LogCaptureForDecorator(names or None, install=False, **kw)
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return wrap(l.install, l.uninstall)
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