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Filename :
logcapture.py
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""" This plugin captures logging statements issued during test execution. When an error or failure occurs, the captured log messages are attached to the running test in the test.capturedLogging attribute, and displayed with the error failure output. It is enabled by default but can be turned off with the option ``--nologcapture``. You can filter captured logging statements with the ``--logging-filter`` option. If set, it specifies which logger(s) will be captured; loggers that do not match will be passed. Example: specifying ``--logging-filter=sqlalchemy,myapp`` will ensure that only statements logged via sqlalchemy.engine, myapp or myapp.foo.bar logger will be logged. You can remove other installed logging handlers with the ``--logging-clear-handlers`` option. """ import logging from logging import Handler import threading from nose.plugins.base import Plugin from nose.util import anyp, ln, safe_str try: from io import StringIO except ImportError: from io import StringIO log = logging.getLogger(__name__) class FilterSet(object): def __init__(self, filter_components): self.inclusive, self.exclusive = self._partition(filter_components) # @staticmethod def _partition(components): inclusive, exclusive = [], [] for component in components: if component.startswith('-'): exclusive.append(component[1:]) else: inclusive.append(component) return inclusive, exclusive _partition = staticmethod(_partition) def allow(self, record): """returns whether this record should be printed""" if not self: # nothing to filter return True return self._allow(record) and not self._deny(record) # @staticmethod def _any_match(matchers, record): """return the bool of whether `record` starts with any item in `matchers`""" def record_matches_key(key): return record == key or record.startswith(key + '.') return anyp(bool, list(map(record_matches_key, matchers))) _any_match = staticmethod(_any_match) def _allow(self, record): if not self.inclusive: return True return self._any_match(self.inclusive, record) def _deny(self, record): if not self.exclusive: return False return self._any_match(self.exclusive, record) class MyMemoryHandler(Handler): def __init__(self, logformat, logdatefmt, filters): Handler.__init__(self) fmt = logging.Formatter(logformat, logdatefmt) self.setFormatter(fmt) self.filterset = FilterSet(filters) self.buffer = [] def emit(self, record): self.buffer.append(self.format(record)) def flush(self): pass # do nothing def truncate(self): self.buffer = [] def filter(self, record): if self.filterset.allow(record.name): return Handler.filter(self, record) def __getstate__(self): state = self.__dict__.copy() del state['lock'] return state def __setstate__(self, state): self.__dict__.update(state) self.lock = threading.RLock() class LogCapture(Plugin): """ Log capture plugin. Enabled by default. Disable with --nologcapture. This plugin captures logging statements issued during test execution, appending any output captured to the error or failure output, should the test fail or raise an error. """ enabled = True env_opt = 'NOSE_NOLOGCAPTURE' name = 'logcapture' score = 500 logformat = '%(name)s: %(levelname)s: %(message)s' logdatefmt = None clear = False filters = ['-nose'] def options(self, parser, env): """Register commandline options. """ parser.add_option( "--nologcapture", action="store_false", default=not env.get(self.env_opt), dest="logcapture", help="Disable logging capture plugin. " "Logging configuration will be left intact." " [NOSE_NOLOGCAPTURE]") parser.add_option( "--logging-format", action="store", dest="logcapture_format", default=env.get('NOSE_LOGFORMAT') or self.logformat, metavar="FORMAT", help="Specify custom format to print statements. " "Uses the same format as used by standard logging handlers." " [NOSE_LOGFORMAT]") parser.add_option( "--logging-datefmt", action="store", dest="logcapture_datefmt", default=env.get('NOSE_LOGDATEFMT') or self.logdatefmt, metavar="FORMAT", help="Specify custom date/time format to print statements. " "Uses the same format as used by standard logging handlers." " [NOSE_LOGDATEFMT]") parser.add_option( "--logging-filter", action="store", dest="logcapture_filters", default=env.get('NOSE_LOGFILTER'), metavar="FILTER", help="Specify which statements to filter in/out. " "By default, everything is captured. If the output is too" " verbose,\nuse this option to filter out needless output.\n" "Example: filter=foo will capture statements issued ONLY to\n" " foo or foo.what.ever.sub but not foobar or other logger.\n" "Specify multiple loggers with comma: filter=foo,bar,baz.\n" "If any logger name is prefixed with a minus, eg filter=-foo,\n" "it will be excluded rather than included. Default: " "exclude logging messages from nose itself (-nose)." " [NOSE_LOGFILTER]\n") parser.add_option( "--logging-clear-handlers", action="store_true", default=False, dest="logcapture_clear", help="Clear all other logging handlers") parser.add_option( "--logging-level", action="store", default='NOTSET', dest="logcapture_level", help="Set the log level to capture") def configure(self, options, conf): """Configure plugin. """ self.conf = conf # Disable if explicitly disabled, or if logging is # configured via logging config file if not options.logcapture or conf.loggingConfig: self.enabled = False self.logformat = options.logcapture_format self.logdatefmt = options.logcapture_datefmt self.clear = options.logcapture_clear self.loglevel = options.logcapture_level if options.logcapture_filters: self.filters = options.logcapture_filters.split(',') def setupLoghandler(self): # setup our handler with root logger root_logger = logging.getLogger() if self.clear: if hasattr(root_logger, "handlers"): for handler in root_logger.handlers: root_logger.removeHandler(handler) for logger in list(logging.Logger.manager.loggerDict.values()): if hasattr(logger, "handlers"): for handler in logger.handlers: logger.removeHandler(handler) # make sure there isn't one already # you can't simply use "if self.handler not in root_logger.handlers" # since at least in unit tests this doesn't work -- # LogCapture() is instantiated for each test case while root_logger # is module global # so we always add new MyMemoryHandler instance for handler in root_logger.handlers[:]: if isinstance(handler, MyMemoryHandler): root_logger.handlers.remove(handler) root_logger.addHandler(self.handler) # to make sure everything gets captured loglevel = getattr(self, "loglevel", "NOTSET") root_logger.setLevel(getattr(logging, loglevel)) def begin(self): """Set up logging handler before test run begins. """ self.start() def start(self): self.handler = MyMemoryHandler(self.logformat, self.logdatefmt, self.filters) self.setupLoghandler() def end(self): pass def beforeTest(self, test): """Clear buffers and handlers before test. """ self.setupLoghandler() def afterTest(self, test): """Clear buffers after test. """ self.handler.truncate() def formatFailure(self, test, err): """Add captured log messages to failure output. """ return self.formatError(test, err) def formatError(self, test, err): """Add captured log messages to error output. """ # logic flow copied from Capture.formatError test.capturedLogging = records = self.formatLogRecords() if not records: return err ec, ev, tb = err return (ec, self.addCaptureToErr(ev, records), tb) def formatLogRecords(self): return list(map(safe_str, self.handler.buffer)) def addCaptureToErr(self, ev, records): return '\n'.join([safe_str(ev), ln('>> begin captured logging <<')] + \ records + \ [ln('>> end captured logging <<')])