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dictconfig.py
# This is a copy of the Python logging.config.dictconfig module, # reproduced with permission. It is provided here for backwards # compatibility for Python versions prior to 2.7. # # Copyright 2009-2010 by Vinay Sajip. All Rights Reserved. # # Permission to use, copy, modify, and distribute this software and its # documentation for any purpose and without fee is hereby granted, # provided that the above copyright notice appear in all copies and that # both that copyright notice and this permission notice appear in # supporting documentation, and that the name of Vinay Sajip # not be used in advertising or publicity pertaining to distribution # of the software without specific, written prior permission. # VINAY SAJIP DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING # ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL # VINAY SAJIP BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR # ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER # IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. from __future__ import absolute_import import logging.handlers import re import sys import types from pip._vendor import six # flake8: noqa IDENTIFIER = re.compile('^[a-z_][a-z0-9_]*$', re.I) def valid_ident(s): m = IDENTIFIER.match(s) if not m: raise ValueError('Not a valid Python identifier: %r' % s) return True # # This function is defined in logging only in recent versions of Python # try: from logging import _checkLevel except ImportError: def _checkLevel(level): if isinstance(level, int): rv = level elif str(level) == level: if level not in logging._levelNames: raise ValueError('Unknown level: %r' % level) rv = logging._levelNames[level] else: raise TypeError('Level not an integer or a ' 'valid string: %r' % level) return rv # The ConvertingXXX classes are wrappers around standard Python containers, # and they serve to convert any suitable values in the container. The # conversion converts base dicts, lists and tuples to their wrapped # equivalents, whereas strings which match a conversion format are converted # appropriately. # # Each wrapper should have a configurator attribute holding the actual # configurator to use for conversion. class ConvertingDict(dict): """A converting dictionary wrapper.""" def __getitem__(self, key): value = dict.__getitem__(self, key) result = self.configurator.convert(value) # If the converted value is different, save for next time if value is not result: self[key] = result if type(result) in (ConvertingDict, ConvertingList, ConvertingTuple): result.parent = self result.key = key return result def get(self, key, default=None): value = dict.get(self, key, default) result = self.configurator.convert(value) # If the converted value is different, save for next time if value is not result: self[key] = result if type(result) in (ConvertingDict, ConvertingList, ConvertingTuple): result.parent = self result.key = key return result def pop(self, key, default=None): value = dict.pop(self, key, default) result = self.configurator.convert(value) if value is not result: if type(result) in (ConvertingDict, ConvertingList, ConvertingTuple): result.parent = self result.key = key return result class ConvertingList(list): """A converting list wrapper.""" def __getitem__(self, key): value = list.__getitem__(self, key) result = self.configurator.convert(value) # If the converted value is different, save for next time if value is not result: self[key] = result if type(result) in (ConvertingDict, ConvertingList, ConvertingTuple): result.parent = self result.key = key return result def pop(self, idx=-1): value = list.pop(self, idx) result = self.configurator.convert(value) if value is not result: if type(result) in (ConvertingDict, ConvertingList, ConvertingTuple): result.parent = self return result class ConvertingTuple(tuple): """A converting tuple wrapper.""" def __getitem__(self, key): value = tuple.__getitem__(self, key) result = self.configurator.convert(value) if value is not result: if type(result) in (ConvertingDict, ConvertingList, ConvertingTuple): result.parent = self result.key = key return result class BaseConfigurator(object): """ The configurator base class which defines some useful defaults. """ CONVERT_PATTERN = re.compile(r'^(?P<prefix>[a-z]+)://(?P<suffix>.*)$') WORD_PATTERN = re.compile(r'^\s*(\w+)\s*') DOT_PATTERN = re.compile(r'^\.\s*(\w+)\s*') INDEX_PATTERN = re.compile(r'^\[\s*(\w+)\s*\]\s*') DIGIT_PATTERN = re.compile(r'^\d+$') value_converters = { 'ext' : 'ext_convert', 'cfg' : 'cfg_convert', } # We might want to use a different one, e.g. importlib importer = __import__ def __init__(self, config): self.config = ConvertingDict(config) self.config.configurator = self def resolve(self, s): """ Resolve strings to objects using standard import and attribute syntax. """ name = s.split('.') used = name.pop(0) try: found = self.importer(used) for frag in name: used += '.' + frag try: found = getattr(found, frag) except AttributeError: self.importer(used) found = getattr(found, frag) return found except ImportError: e, tb = sys.exc_info()[1:] v = ValueError('Cannot resolve %r: %s' % (s, e)) v.__cause__, v.__traceback__ = e, tb raise v def ext_convert(self, value): """Default converter for the ext:// protocol.""" return self.resolve(value) def cfg_convert(self, value): """Default converter for the cfg:// protocol.""" rest = value m = self.WORD_PATTERN.match(rest) if m is None: raise ValueError("Unable to convert %r" % value) else: rest = rest[m.end():] d = self.config[m.groups()[0]] # print d, rest while rest: m = self.DOT_PATTERN.match(rest) if m: d = d[m.groups()[0]] else: m = self.INDEX_PATTERN.match(rest) if m: idx = m.groups()[0] if not self.DIGIT_PATTERN.match(idx): d = d[idx] else: try: n = int(idx) # try as number first (most likely) d = d[n] except TypeError: d = d[idx] if m: rest = rest[m.end():] else: raise ValueError('Unable to convert ' '%r at %r' % (value, rest)) # rest should be empty return d def convert(self, value): """ Convert values to an appropriate type. dicts, lists and tuples are replaced by their converting alternatives. Strings are checked to see if they have a conversion format and are converted if they do. """ if not isinstance(value, ConvertingDict) and isinstance(value, dict): value = ConvertingDict(value) value.configurator = self elif not isinstance(value, ConvertingList) and isinstance(value, list): value = ConvertingList(value) value.configurator = self elif not isinstance(value, ConvertingTuple) and\ isinstance(value, tuple): value = ConvertingTuple(value) value.configurator = self elif isinstance(value, six.string_types): # str for py3k m = self.CONVERT_PATTERN.match(value) if m: d = m.groupdict() prefix = d['prefix'] converter = self.value_converters.get(prefix, None) if converter: suffix = d['suffix'] converter = getattr(self, converter) value = converter(suffix) return value def configure_custom(self, config): """Configure an object with a user-supplied factory.""" c = config.pop('()') if not hasattr(c, '__call__') and hasattr(types, 'ClassType') and type(c) != types.ClassType: c = self.resolve(c) props = config.pop('.', None) # Check for valid identifiers kwargs = dict((k, config[k]) for k in config if valid_ident(k)) result = c(**kwargs) if props: for name, value in props.items(): setattr(result, name, value) return result def as_tuple(self, value): """Utility function which converts lists to tuples.""" if isinstance(value, list): value = tuple(value) return value class DictConfigurator(BaseConfigurator): """ Configure logging using a dictionary-like object to describe the configuration. """ def configure(self): """Do the configuration.""" config = self.config if 'version' not in config: raise ValueError("dictionary doesn't specify a version") if config['version'] != 1: raise ValueError("Unsupported version: %s" % config['version']) incremental = config.pop('incremental', False) EMPTY_DICT = {} logging._acquireLock() try: if incremental: handlers = config.get('handlers', EMPTY_DICT) # incremental handler config only if handler name # ties in to logging._handlers (Python 2.7) if sys.version_info[:2] == (2, 7): for name in handlers: if name not in logging._handlers: raise ValueError('No handler found with ' 'name %r' % name) else: try: handler = logging._handlers[name] handler_config = handlers[name] level = handler_config.get('level', None) if level: handler.setLevel(_checkLevel(level)) except StandardError as e: raise ValueError('Unable to configure handler ' '%r: %s' % (name, e)) loggers = config.get('loggers', EMPTY_DICT) for name in loggers: try: self.configure_logger(name, loggers[name], True) except StandardError as e: raise ValueError('Unable to configure logger ' '%r: %s' % (name, e)) root = config.get('root', None) if root: try: self.configure_root(root, True) except StandardError as e: raise ValueError('Unable to configure root ' 'logger: %s' % e) else: disable_existing = config.pop('disable_existing_loggers', True) logging._handlers.clear() del logging._handlerList[:] # Do formatters first - they don't refer to anything else formatters = config.get('formatters', EMPTY_DICT) for name in formatters: try: formatters[name] = self.configure_formatter( formatters[name]) except StandardError as e: raise ValueError('Unable to configure ' 'formatter %r: %s' % (name, e)) # Next, do filters - they don't refer to anything else, either filters = config.get('filters', EMPTY_DICT) for name in filters: try: filters[name] = self.configure_filter(filters[name]) except StandardError as e: raise ValueError('Unable to configure ' 'filter %r: %s' % (name, e)) # Next, do handlers - they refer to formatters and filters # As handlers can refer to other handlers, sort the keys # to allow a deterministic order of configuration handlers = config.get('handlers', EMPTY_DICT) for name in sorted(handlers): try: handler = self.configure_handler(handlers[name]) handler.name = name handlers[name] = handler except StandardError as e: raise ValueError('Unable to configure handler ' '%r: %s' % (name, e)) # Next, do loggers - they refer to handlers and filters # we don't want to lose the existing loggers, # since other threads may have pointers to them. # existing is set to contain all existing loggers, # and as we go through the new configuration we # remove any which are configured. At the end, # what's left in existing is the set of loggers # which were in the previous configuration but # which are not in the new configuration. root = logging.root existing = list(root.manager.loggerDict) # The list needs to be sorted so that we can # avoid disabling child loggers of explicitly # named loggers. With a sorted list it is easier # to find the child loggers. existing.sort() # We'll keep the list of existing loggers # which are children of named loggers here... child_loggers = [] # now set up the new ones... loggers = config.get('loggers', EMPTY_DICT) for name in loggers: if name in existing: i = existing.index(name) prefixed = name + "." pflen = len(prefixed) num_existing = len(existing) i = i + 1 # look at the entry after name while (i < num_existing) and\ (existing[i][:pflen] == prefixed): child_loggers.append(existing[i]) i = i + 1 existing.remove(name) try: self.configure_logger(name, loggers[name]) except StandardError as e: raise ValueError('Unable to configure logger ' '%r: %s' % (name, e)) # Disable any old loggers. There's no point deleting # them as other threads may continue to hold references # and by disabling them, you stop them doing any logging. # However, don't disable children of named loggers, as that's # probably not what was intended by the user. for log in existing: logger = root.manager.loggerDict[log] if log in child_loggers: logger.level = logging.NOTSET logger.handlers = [] logger.propagate = True elif disable_existing: logger.disabled = True # And finally, do the root logger root = config.get('root', None) if root: try: self.configure_root(root) except StandardError as e: raise ValueError('Unable to configure root ' 'logger: %s' % e) finally: logging._releaseLock() def configure_formatter(self, config): """Configure a formatter from a dictionary.""" if '()' in config: factory = config['()'] # for use in exception handler try: result = self.configure_custom(config) except TypeError as te: if "'format'" not in str(te): raise # Name of parameter changed from fmt to format. # Retry with old name. # This is so that code can be used with older Python versions #(e.g. by Django) config['fmt'] = config.pop('format') config['()'] = factory result = self.configure_custom(config) else: fmt = config.get('format', None) dfmt = config.get('datefmt', None) result = logging.Formatter(fmt, dfmt) return result def configure_filter(self, config): """Configure a filter from a dictionary.""" if '()' in config: result = self.configure_custom(config) else: name = config.get('name', '') result = logging.Filter(name) return result def add_filters(self, filterer, filters): """Add filters to a filterer from a list of names.""" for f in filters: try: filterer.addFilter(self.config['filters'][f]) except StandardError as e: raise ValueError('Unable to add filter %r: %s' % (f, e)) def configure_handler(self, config): """Configure a handler from a dictionary.""" formatter = config.pop('formatter', None) if formatter: try: formatter = self.config['formatters'][formatter] except StandardError as e: raise ValueError('Unable to set formatter ' '%r: %s' % (formatter, e)) level = config.pop('level', None) filters = config.pop('filters', None) if '()' in config: c = config.pop('()') if not hasattr(c, '__call__') and hasattr(types, 'ClassType') and type(c) != types.ClassType: c = self.resolve(c) factory = c else: klass = self.resolve(config.pop('class')) # Special case for handler which refers to another handler if issubclass(klass, logging.handlers.MemoryHandler) and\ 'target' in config: try: config['target'] = self.config['handlers'][config['target']] except StandardError as e: raise ValueError('Unable to set target handler ' '%r: %s' % (config['target'], e)) elif issubclass(klass, logging.handlers.SMTPHandler) and\ 'mailhost' in config: config['mailhost'] = self.as_tuple(config['mailhost']) elif issubclass(klass, logging.handlers.SysLogHandler) and\ 'address' in config: config['address'] = self.as_tuple(config['address']) factory = klass kwargs = dict((k, config[k]) for k in config if valid_ident(k)) try: result = factory(**kwargs) except TypeError as te: if "'stream'" not in str(te): raise # The argument name changed from strm to stream # Retry with old name. # This is so that code can be used with older Python versions #(e.g. by Django) kwargs['strm'] = kwargs.pop('stream') result = factory(**kwargs) if formatter: result.setFormatter(formatter) if level is not None: result.setLevel(_checkLevel(level)) if filters: self.add_filters(result, filters) return result def add_handlers(self, logger, handlers): """Add handlers to a logger from a list of names.""" for h in handlers: try: logger.addHandler(self.config['handlers'][h]) except StandardError as e: raise ValueError('Unable to add handler %r: %s' % (h, e)) def common_logger_config(self, logger, config, incremental=False): """ Perform configuration which is common to root and non-root loggers. """ level = config.get('level', None) if level is not None: logger.setLevel(_checkLevel(level)) if not incremental: # Remove any existing handlers for h in logger.handlers[:]: logger.removeHandler(h) handlers = config.get('handlers', None) if handlers: self.add_handlers(logger, handlers) filters = config.get('filters', None) if filters: self.add_filters(logger, filters) def configure_logger(self, name, config, incremental=False): """Configure a non-root logger from a dictionary.""" logger = logging.getLogger(name) self.common_logger_config(logger, config, incremental) propagate = config.get('propagate', None) if propagate is not None: logger.propagate = propagate def configure_root(self, config, incremental=False): """Configure a root logger from a dictionary.""" root = logging.getLogger() self.common_logger_config(root, config, incremental) dictConfigClass = DictConfigurator def dictConfig(config): """Configure logging using a dictionary.""" dictConfigClass(config).configure()
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