# Copyright 2001-2023 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.
"""
Configuration functions for the logging package for Python. The core package
is based on PEP 282 and comments thereto in comp.lang.python, and influenced
by Apache's log4j system.
Copyright (C) 2001-2022 Vinay Sajip. All Rights Reserved.
To use, simply 'import logging' and log away!
"""
import errno
import functools
import io
import logging
import logging.handlers
import os
import queue
import re
import struct
import threading
import traceback
from socketserver import ThreadingTCPServer, StreamRequestHandler
DEFAULT_LOGGING_CONFIG_PORT = 9030
RESET_ERROR = errno.ECONNRESET
#
# The following code implements a socket listener for on-the-fly
# reconfiguration of logging.
#
# _listener holds the server object doing the listening
_listener = None
def fileConfig(fname, defaults=None, disable_existing_loggers=True, encoding=None):
"""
Read the logging configuration from a ConfigParser-format file.
This can be called several times from an application, allowing an end user
the ability to select from various pre-canned configurations (if the
developer provides a mechanism to present the choices and load the chosen
configuration).
"""
import configparser
if isinstance(fname, str):
if not os.path.exists(fname):
raise FileNotFoundError(f"{fname} doesn't exist")
elif not os.path.getsize(fname):
raise RuntimeError(f'{fname} is an empty file')
if isinstance(fname, configparser.RawConfigParser):
cp = fname
else:
try:
cp = configparser.ConfigParser(defaults)
if hasattr(fname, 'readline'):
cp.read_file(fname)
else:
encoding = io.text_encoding(encoding)
cp.read(fname, encoding=encoding)
except configparser.ParsingError as e:
raise RuntimeError(f'{fname} is invalid: {e}')
formatters = _create_formatters(cp)
# critical section
logging._acquireLock()
try:
_clearExistingHandlers()
# Handlers add themselves to logging._handlers
handlers = _install_handlers(cp, formatters)
_install_loggers(cp, handlers, disable_existing_loggers)
finally:
logging._releaseLock()
def _resolve(name):
"""Resolve a dotted name to a global object."""
name = name.split('.')
used = name.pop(0)
found = __import__(used)
for n in name:
used = used + '.' + n
try:
found = getattr(found, n)
except AttributeError:
__import__(used)
found = getattr(found, n)
return found
def _strip_spaces(alist):
return map(str.strip, alist)
def _create_formatters(cp):
"""Create and return formatters"""
flist = cp["formatters"]["keys"]
if not len(flist):
return {}
flist = flist.split(",")
flist = _strip_spaces(flist)
formatters = {}
for form in flist:
sectname = "formatter_%s" % form
fs = cp.get(sectname, "format", raw=True, fallback=None)
dfs = cp.get(sectname, "datefmt", raw=True, fallback=None)
stl = cp.get(sectname, "style", raw=True, fallback='%')
defaults = cp.get(sectname, "defaults", raw=True, fallback=None)
c = logging.Formatter
class_name = cp[sectname].get("class")
if class_name:
c = _resolve(class_name)
if defaults is not None:
defaults = eval(defaults, vars(logging))
f = c(fs, dfs, stl, defaults=defaults)
else:
f = c(fs, dfs, stl)
formatters[form] = f
return formatters
def _install_handlers(cp, formatters):
"""Install and return handlers"""
hlist = cp["handlers"]["keys"]
if not len(hlist):
return {}
hlist = hlist.split(",")
hlist = _strip_spaces(hlist)
handlers = {}
fixups = [] #for inter-handler references
for hand in hlist:
section = cp["handler_%s" % hand]
klass = section["class"]
fmt = section.get("formatter", "")
try:
klass = eval(klass, vars(logging))
except (AttributeError, NameError):
klass = _resolve(klass)
args = section.get("args", '()')
args = eval(args, vars(logging))
kwargs = section.get("kwargs", '{}')
kwargs = eval(kwargs, vars(logging))
h = klass(*args, **kwargs)
h.name = hand
if "level" in section:
level = section["level"]
h.setLevel(level)
if len(fmt):
h.setFormatter(formatters[fmt])
if issubclass(klass, logging.handlers.MemoryHandler):
target = section.get("target", "")
if len(target): #the target handler may not be loaded yet, so keep for later...
fixups.append((h, target))
handlers[hand] = h
#now all handlers are loaded, fixup inter-handler references...
for h, t in fixups:
h.setTarget(handlers[t])
return handlers
def _handle_existing_loggers(existing, child_loggers, disable_existing):
"""
When (re)configuring logging, handle loggers which were in the previous
configuration but are not in the new configuration. There's no point
deleting them as other threads may continue to hold references to them;
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. Also, allow existing loggers to NOT be
disabled if disable_existing is false.
"""
root = logging.root
for log in existing:
logger = root.manager.loggerDict[log]
if log in child_loggers:
if not isinstance(logger, logging.PlaceHolder):
logger.setLevel(logging.NOTSET)
logger.handlers = []
logger.propagate = True
else:
logger.disabled = disable_existing
def _install_loggers(cp, handlers, disable_existing):
"""Create and install loggers"""
# configure the root first
llist = cp["loggers"]["keys"]
llist = llist.split(",")
llist = list(_strip_spaces(llist))
llist.remove("root")
section = cp["logger_root"]
root = logging.root
log = root
if "level" in section:
level = section["level"]
log.setLevel(level)
for h in root.handlers[:]:
root.removeHandler(h)
hlist = section["handlers"]
if len(hlist):
hlist = hlist.split(",")
hlist = _strip_spaces(hlist)
for hand in hlist:
log.addHandler(handlers[hand])
#and now the others...
#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.
existing = list(root.manager.loggerDict.keys())
#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...
for log in llist:
section = cp["logger_%s" % log]
qn = section["qualname"]
propagate = section.getint("propagate", fallback=1)
logger = logging.getLogger(qn)
if qn in existing:
i = existing.index(qn) + 1 # start with the entry after qn
prefixed = qn + "."
pflen = len(prefixed)
num_existing = len(existing)
while i < num_existing:
if existing[i][:pflen] == prefixed:
child_loggers.append(existing[i])
i += 1
existing.remove(qn)
if "level" in section:
level = section["level"]
logger.setLevel(level)
for h in logger.handlers[:]:
logger.removeHandler(h)
logger.propagate = propagate
logger.disabled = 0
hlist = section["handlers"]
if len(hlist):
hlist = hlist.split(",")
hlist = _strip_spaces(hlist)
for hand in hlist:
logger.addHandler(handlers[hand])
#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 = 1
# elif disable_existing_loggers:
# logger.disabled = 1
_handle_existing_loggers(existing, child_loggers, disable_existing)
def _clearExistingHandlers():
"""Clear and close existing handlers"""
logging._handlers.clear()
logging.shutdown(logging._handlerList[:])
del logging._handlerList[:]
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
class ConvertingMixin(object):
"""For ConvertingXXX's, this mixin class provides common functions"""
def convert_with_key(self, key, value, replace=True):
result = self.configurator.convert(value)
#If the converted value is different, save for next time
if value is not result:
if replace:
self[key] = result
if type(result) in (ConvertingDict, ConvertingList,
ConvertingTuple):
result.parent = self
result.key = key
return result
def convert(self, value):
result = self.configurator.convert(value)
if value is not result:
if type(result) in (ConvertingDict, ConvertingList,
ConvertingTuple):
result.parent = self
return result
# 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, ConvertingMixin):
"""A converting dictionary wrapper."""
def __getitem__(self, key):
value = dict.__getitem__(self, key)
return self.convert_with_key(key, value)
def get(self, key, default=None):
value = dict.get(self, key, default)
return self.convert_with_key(key, value)
def pop(self, key, default=None):
value = dict.pop(self, key, default)
return self.convert_with_key(key, value, replace=False)
class ConvertingList(list, ConvertingMixin):
"""A converting list wrapper."""
def __getitem__(self, key):
value = list.__getitem__(self, key)
return self.convert_with_key(key, value)
def pop(self, idx=-1):
value = list.pop(self, idx)
return self.convert(value)
class ConvertingTuple(tuple, ConvertingMixin):
"""A converting tuple wrapper."""
def __getitem__(self, key):
value = tuple.__getitem__(self, key)
# Can't replace a tuple entry.
return self.convert_with_key(key, value, replace=False)
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 = staticmethod(__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 as e:
v = ValueError('Cannot resolve %r: %s' % (s, e))
raise v from e
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) and not hasattr(value, '_fields'):
value = ConvertingTuple(value)
value.configurator = self
elif isinstance(value, str): # 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 callable(c):
c = self.resolve(c)
# Check for valid identifiers
kwargs = {k: config[k] for k in config if (k != '.' and valid_ident(k))}
result = c(**kwargs)
props = config.pop('.', None)
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)
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(logging._checkLevel(level))
except Exception as e:
raise ValueError('Unable to configure handler '
'%r' % name) from e
loggers = config.get('loggers', EMPTY_DICT)
for name in loggers:
try:
self.configure_logger(name, loggers[name], True)
except Exception as e:
raise ValueError('Unable to configure logger '
'%r' % name) from e
root = config.get('root', None)
if root:
try:
self.configure_root(root, True)
except Exception as e:
raise ValueError('Unable to configure root '
'logger') from e
else:
disable_existing = config.pop('disable_existing_loggers', True)
_clearExistingHandlers()
# 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 Exception as e:
raise ValueError('Unable to configure '
'formatter %r' % name) from 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 Exception as e:
raise ValueError('Unable to configure '
'filter %r' % name) from 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)
deferred = []
for name in sorted(handlers):
try:
handler = self.configure_handler(handlers[name])
handler.name = name
handlers[name] = handler
except Exception as e:
if ' not configured yet' in str(e.__cause__):
deferred.append(name)
else:
raise ValueError('Unable to configure handler '
'%r' % name) from e
# Now do any that were deferred
for name in deferred:
try:
handler = self.configure_handler(handlers[name])
handler.name = name
handlers[name] = handler
except Exception as e:
raise ValueError('Unable to configure handler '
'%r' % name) from 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.keys())
#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) + 1 # look after name
prefixed = name + "."
pflen = len(prefixed)
num_existing = len(existing)
while i < num_existing:
if existing[i][:pflen] == prefixed:
child_loggers.append(existing[i])
i += 1
existing.remove(name)
try:
self.configure_logger(name, loggers[name])
except Exception as e:
raise ValueError('Unable to configure logger '
'%r' % name) from 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
_handle_existing_loggers(existing, child_loggers,
disable_existing)
# And finally, do the root logger
root = config.get('root', None)
if root:
try:
self.configure_root(root)
except Exception as e:
raise ValueError('Unable to configure root '
'logger') from 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)
style = config.get('style', '%')
cname = config.get('class', None)
defaults = config.get('defaults', None)
if not cname:
c = logging.Formatter
else:
c = _resolve(cname)
kwargs = {}
# Add defaults only if it exists.
# Prevents TypeError in custom formatter callables that do not
# accept it.
if defaults is not None:
kwargs['defaults'] = defaults
# A TypeError would be raised if "validate" key is passed in with a formatter callable
# that does not accept "validate" as a parameter
if 'validate' in config: # if user hasn't mentioned it, the default will be fine
result = c(fmt, dfmt, style, config['validate'], **kwargs)
else:
result = c(fmt, dfmt, style, **kwargs)
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:
if callable(f) or callable(getattr(f, 'filter', None)):
filter_ = f
else:
filter_ = self.config['filters'][f]
filterer.addFilter(filter_)
except Exception as e:
raise ValueError('Unable to add filter %r' % f) from e
def _configure_queue_handler(self, klass, **kwargs):
if 'queue' in kwargs:
q = kwargs['queue']
else:
q = queue.Queue() # unbounded
rhl = kwargs.get('respect_handler_level', False)
if 'listener' in kwargs:
lklass = kwargs['listener']
else:
lklass = logging.handlers.QueueListener
listener = lklass(q, *kwargs.get('handlers', []), respect_handler_level=rhl)
handler = klass(q)
handler.listener = listener
return handler
def configure_handler(self, config):
"""Configure a handler from a dictionary."""
config_copy = dict(config) # for restoring in case of error
formatter = config.pop('formatter', None)
if formatter:
try:
formatter = self.config['formatters'][formatter]
except Exception as e:
raise ValueError('Unable to set formatter '
'%r' % formatter) from e
level = config.pop('level', None)
filters = config.pop('filters', None)
if '()' in config:
c = config.pop('()')
if not callable(c):
c = self.resolve(c)
factory = c
else:
cname = config.pop('class')
if callable(cname):
klass = cname
else:
klass = self.resolve(cname)
if issubclass(klass, logging.handlers.MemoryHandler) and\
'target' in config:
# Special case for handler which refers to another handler
try:
tn = config['target']
th = self.config['handlers'][tn]
if not isinstance(th, logging.Handler):
config.update(config_copy) # restore for deferred cfg
raise TypeError('target not configured yet')
config['target'] = th
except Exception as e:
raise ValueError('Unable to set target handler %r' % tn) from e
elif issubclass(klass, logging.handlers.QueueHandler):
# Another special case for handler which refers to other handlers
# if 'handlers' not in config:
# raise ValueError('No handlers specified for a QueueHandler')
if 'queue' in config:
from multiprocessing.queues import Queue as MPQueue
qspec = config['queue']
if not isinstance(qspec, (queue.Queue, MPQueue)):
if isinstance(qspec, str):
q = self.resolve(qspec)
if not callable(q):
raise TypeError('Invalid queue specifier %r' % qspec)
q = q()
elif isinstance(qspec, dict):
if '()' not in qspec:
raise TypeError('Invalid queue specifier %r' % qspec)
q = self.configure_custom(dict(qspec))
else:
raise TypeError('Invalid queue specifier %r' % qspec)
config['queue'] = q
if 'listener' in config:
lspec = config['listener']
if isinstance(lspec, type):
if not issubclass(lspec, logging.handlers.QueueListener):
raise TypeError('Invalid listener specifier %r' % lspec)
else:
if isinstance(lspec, str):
listener = self.resolve(lspec)
if isinstance(listener, type) and\
not issubclass(listener, logging.handlers.QueueListener):
raise TypeError('Invalid listener specifier %r' % lspec)
elif isinstance(lspec, dict):
if '()' not in lspec:
raise TypeError('Invalid listener specifier %r' % lspec)
listener = self.configure_custom(dict(lspec))
else:
raise TypeError('Invalid listener specifier %r' % lspec)
if not callable(listener):
raise TypeError('Invalid listener specifier %r' % lspec)
config['listener'] = listener
if 'handlers' in config:
hlist = []
try:
for hn in config['handlers']:
h = self.config['handlers'][hn]
if not isinstance(h, logging.Handler):
config.update(config_copy) # restore for deferred cfg
raise TypeError('Required handler %r '
'is not configured yet' % hn)
hlist.append(h)
except Exception as e:
raise ValueError('Unable to set required handler %r' % hn) from e
config['handlers'] = hlist
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'])
if issubclass(klass, logging.handlers.QueueHandler):
factory = functools.partial(self._configure_queue_handler, klass)
else:
factory = klass
kwargs = {k: config[k] for k in config if (k != '.' and 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(logging._checkLevel(level))
if filters:
self.add_filters(result, filters)
props = config.pop('.', None)
if props:
for name, value in props.items():
setattr(result, name, value)
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 Exception as e:
raise ValueError('Unable to add handler %r' % h) from 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(logging._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)
logger.disabled = False
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()
def listen(port=DEFAULT_LOGGING_CONFIG_PORT, verify=None):
"""
Start up a socket server on the specified port, and listen for new
configurations.
These will be sent as a file suitable for processing by fileConfig().
Returns a Thread object on which you can call start() to start the server,
and which you can join() when appropriate. To stop the server, call
stopListening().
Use the ``verify`` argument to verify any bytes received across the wire
from a client. If specified, it should be a callable which receives a
single argument - the bytes of configuration data received across the
network - and it should return either ``None``, to indicate that the
passed in bytes could not be verified and should be discarded, or a
byte string which is then passed to the configuration machinery as
normal. Note that you can return transformed bytes, e.g. by decrypting
the bytes passed in.
"""
class ConfigStreamHandler(StreamRequestHandler):
"""
Handler for a logging configuration request.
It expects a completely new logging configuration and uses fileConfig
to install it.
"""
def handle(self):
"""
Handle a request.
Each request is expected to be a 4-byte length, packed using
struct.pack(">L", n), followed by the config file.
Uses fileConfig() to do the grunt work.
"""
try:
conn = self.connection
chunk = conn.recv(4)
if len(chunk) == 4:
slen = struct.unpack(">L", chunk)[0]
chunk = self.connection.recv(slen)
while len(chunk) < slen:
chunk = chunk + conn.recv(slen - len(chunk))
if self.server.verify is not None:
chunk = self.server.verify(chunk)
if chunk is not None: # verified, can process
chunk = chunk.decode("utf-8")
try:
import json
d =json.loads(chunk)
assert isinstance(d, dict)
dictConfig(d)
except Exception:
#Apply new configuration.
file = io.StringIO(chunk)
try:
fileConfig(file)
except Exception:
traceback.print_exc()
if self.server.ready:
self.server.ready.set()
except OSError as e:
if e.errno != RESET_ERROR:
raise
class ConfigSocketReceiver(ThreadingTCPServer):
"""
A simple TCP socket-based logging config receiver.
"""
allow_reuse_address = 1
def __init__(self, host='localhost', port=DEFAULT_LOGGING_CONFIG_PORT,
handler=None, ready=None, verify=None):
ThreadingTCPServer.__init__(self, (host, port), handler)
logging._acquireLock()
self.abort = 0
logging._releaseLock()
self.timeout = 1
self.ready = ready
self.verify = verify
def serve_until_stopped(self):
import select
abort = 0
while not abort:
rd, wr, ex = select.select([self.socket.fileno()],
[], [],
self.timeout)
if rd:
self.handle_request()
logging._acquireLock()
abort = self.abort
logging._releaseLock()
self.server_close()
class Server(threading.Thread):
def __init__(self, rcvr, hdlr, port, verify):
super(Server, self).__init__()
self.rcvr = rcvr
self.hdlr = hdlr
self.port = port
self.verify = verify
self.ready = threading.Event()
def run(self):
server = self.rcvr(port=self.port, handler=self.hdlr,
ready=self.ready,
verify=self.verify)
if self.port == 0:
self.port = server.server_address[1]
self.ready.set()
global _listener
logging._acquireLock()
_listener = server
logging._releaseLock()
server.serve_until_stopped()
return Server(ConfigSocketReceiver, ConfigStreamHandler, port, verify)
def stopListening():
"""
Stop the listening server which was created with a call to listen().
"""
global _listener
logging._acquireLock()
try:
if _listener:
_listener.abort = 1
_listener = None
finally:
logging._releaseLock()
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