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OpenStack Study: log.py**** CubicPower OpenStack Study ****
# Copyright 2011 OpenStack Foundation. # Copyright 2010 United States Government as represented by the # Administrator of the National Aeronautics and Space Administration. # All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. """Openstack logging handler. This module adds to logging functionality by adding the option to specify a context object when calling the various log methods. If the context object is not specified, default formatting is used. Additionally, an instance uuid may be passed as part of the log message, which is intended to make it easier for admins to find messages related to a specific instance. It also allows setting of formatting information through conf. """ import inspect import itertools import logging import logging.config import logging.handlers import os import re import sys import traceback from oslo.config import cfg import six from six import moves from nova.openstack.common.gettextutils import _ from nova.openstack.common import importutils from nova.openstack.common import jsonutils from nova.openstack.common import local _DEFAULT_LOG_DATE_FORMAT = "%Y-%m-%d %H:%M:%S" _SANITIZE_KEYS = ['adminPass', 'admin_pass', 'password', 'admin_password'] # NOTE(ldbragst): Let's build a list of regex objects using the list of # _SANITIZE_KEYS we already have. This way, we only have to add the new key # to the list of _SANITIZE_KEYS and we can generate regular expressions # for XML and JSON automatically. _SANITIZE_PATTERNS = [] _FORMAT_PATTERNS = [r'(%(key)s\s*[=]\s*[\"\']).*?([\"\'])', r'(<%(key)s>).*?()', r'([\"\']%(key)s[\"\']\s*:\s*[\"\']).*?([\"\'])', r'([\'"].*?%(key)s[\'"]\s*:\s*u?[\'"]).*?([\'"])'] for key in _SANITIZE_KEYS: for pattern in _FORMAT_PATTERNS: reg_ex = re.compile(pattern % {'key': key}, re.DOTALL) _SANITIZE_PATTERNS.append(reg_ex) common_cli_opts = [ cfg.BoolOpt('debug', short='d', default=False, help='Print debugging output (set logging level to ' 'DEBUG instead of default WARNING level).'), cfg.BoolOpt('verbose', short='v', default=False, help='Print more verbose output (set logging level to ' 'INFO instead of default WARNING level).'), ] logging_cli_opts = [ cfg.StrOpt('log-config-append', metavar='PATH', deprecated_name='log-config', help='The name of logging configuration file. It does not ' 'disable existing loggers, but just appends specified ' 'logging configuration to any other existing logging ' 'options. Please see the Python logging module ' 'documentation for details on logging configuration ' 'files.'), cfg.StrOpt('log-format', default=None, metavar='FORMAT', help='DEPRECATED. ' 'A logging.Formatter log message format string which may ' 'use any of the available logging.LogRecord attributes. ' 'This option is deprecated. Please use ' 'logging_context_format_string and ' 'logging_default_format_string instead.'), cfg.StrOpt('log-date-format', default=_DEFAULT_LOG_DATE_FORMAT, metavar='DATE_FORMAT', help='Format string for %%(asctime)s in log records. ' 'Default: %(default)s'), cfg.StrOpt('log-file', metavar='PATH', deprecated_name='logfile', help='(Optional) Name of log file to output to. ' 'If no default is set, logging will go to stdout.'), cfg.StrOpt('log-dir', deprecated_name='logdir', help='(Optional) The base directory used for relative ' '--log-file paths'), cfg.BoolOpt('use-syslog', default=False, help='Use syslog for logging. ' 'Existing syslog format is DEPRECATED during I, ' 'and then will be changed in J to honor RFC5424'), cfg.BoolOpt('use-syslog-rfc-format', # TODO(bogdando) remove or use True after existing # syslog format deprecation in J default=False, help='(Optional) Use syslog rfc5424 format for logging. ' 'If enabled, will add APP-NAME (RFC5424) before the ' 'MSG part of the syslog message. The old format ' 'without APP-NAME is deprecated in I, ' 'and will be removed in J.'), cfg.StrOpt('syslog-log-facility', default='LOG_USER', help='syslog facility to receive log lines') ] generic_log_opts = [ cfg.BoolOpt('use_stderr', default=True, help='Log output to standard error') ] log_opts = [ cfg.StrOpt('logging_context_format_string', default='%(asctime)s.%(msecs)03d %(process)d %(levelname)s ' '%(name)s [%(request_id)s %(user)s %(tenant)s] ' '%(instance)s%(message)s', help='format string to use for log messages with context'), cfg.StrOpt('logging_default_format_string', default='%(asctime)s.%(msecs)03d %(process)d %(levelname)s ' '%(name)s [-] %(instance)s%(message)s', help='format string to use for log messages without context'), cfg.StrOpt('logging_debug_format_suffix', default='%(funcName)s %(pathname)s:%(lineno)d', help='data to append to log format when level is DEBUG'), cfg.StrOpt('logging_exception_prefix', default='%(asctime)s.%(msecs)03d %(process)d TRACE %(name)s ' '%(instance)s', help='prefix each line of exception output with this format'), cfg.ListOpt('default_log_levels', default=[ 'amqp=WARN', 'amqplib=WARN', 'boto=WARN', 'qpid=WARN', 'sqlalchemy=WARN', 'suds=INFO', 'oslo.messaging=INFO', 'iso8601=WARN', ], help='list of logger=LEVEL pairs'), cfg.BoolOpt('publish_errors', default=False, help='publish error events'), cfg.BoolOpt('fatal_deprecations', default=False, help='make deprecations fatal'), # NOTE(mikal): there are two options here because sometimes we are handed # a full instance (and could include more information), and other times we # are just handed a UUID for the instance. cfg.StrOpt('instance_format', default='[instance: %(uuid)s] ', help='If an instance is passed with the log message, format ' 'it like this'), cfg.StrOpt('instance_uuid_format', default='[instance: %(uuid)s] ', help='If an instance UUID is passed with the log message, ' 'format it like this'), ] CONF = cfg.CONF CONF.register_cli_opts(common_cli_opts) CONF.register_cli_opts(logging_cli_opts) CONF.register_opts(generic_log_opts) CONF.register_opts(log_opts) # our new audit level # NOTE(jkoelker) Since we synthesized an audit level, make the logging # module aware of it so it acts like other levels. logging.AUDIT = logging.INFO + 1 logging.addLevelName(logging.AUDIT, 'AUDIT') try: NullHandler = logging.NullHandler except AttributeError: # NOTE(jkoelker) NullHandler added in Python 2.7 class NullHandler(logging.Handler):
**** CubicPower OpenStack Study **** def _dictify_context(context): if context is None: return None if not isinstance(context, dict) and getattr(context, 'to_dict', None): context = context.to_dict() return context
**** CubicPower OpenStack Study **** def _get_binary_name(): return os.path.basename(inspect.stack()[-1][1])
**** CubicPower OpenStack Study **** def _get_log_file_path(binary=None): logfile = CONF.log_file logdir = CONF.log_dir if logfile and not logdir: return logfile if logfile and logdir: return os.path.join(logdir, logfile) if logdir: binary = binary or _get_binary_name() return '%s.log' % (os.path.join(logdir, binary),) return None
**** CubicPower OpenStack Study **** def mask_password(message, secret="***"): """Replace password with 'secret' in message. :param message: The string which includes security information. :param secret: value with which to replace passwords. :returns: The unicode value of message with the password fields masked. For example: >>> mask_password("'adminPass' : 'aaaaa'") "'adminPass' : '***'" >>> mask_password("'admin_pass' : 'aaaaa'") "'admin_pass' : '***'" >>> mask_password('"password" : "aaaaa"') '"password" : "***"' >>> mask_password("'original_password' : 'aaaaa'") "'original_password' : '***'" >>> mask_password("u'original_password' : u'aaaaa'") "u'original_password' : u'***'" """ message = six.text_type(message) # NOTE(ldbragst): Check to see if anything in message contains any key # specified in _SANITIZE_KEYS, if not then just return the message since # we don't have to mask any passwords. if not any(key in message for key in _SANITIZE_KEYS): return message secret = r'\g<1>' + secret + r'\g<2>' for pattern in _SANITIZE_PATTERNS: message = re.sub(pattern, secret, message) return message
**** CubicPower OpenStack Study **** class BaseLoggerAdapter(logging.LoggerAdapter):
**** CubicPower OpenStack Study **** def audit(self, msg, *args, **kwargs): self.log(logging.AUDIT, msg, *args, **kwargs)
**** CubicPower OpenStack Study **** class LazyAdapter(BaseLoggerAdapter):
**** CubicPower OpenStack Study **** def __init__(self, name='unknown', version='unknown'): self._logger = None self.extra = {} self.name = name self.version = version @property
**** CubicPower OpenStack Study **** def logger(self): if not self._logger: self._logger = getLogger(self.name, self.version) return self._logger
**** CubicPower OpenStack Study **** class ContextAdapter(BaseLoggerAdapter): warn = logging.LoggerAdapter.warning
**** CubicPower OpenStack Study **** def __init__(self, logger, project_name, version_string): self.logger = logger self.project = project_name self.version = version_string @property
**** CubicPower OpenStack Study **** def handlers(self): return self.logger.handlers
**** CubicPower OpenStack Study **** def deprecated(self, msg, *args, **kwargs): stdmsg = _("Deprecated: %s") % msg if CONF.fatal_deprecations: self.critical(stdmsg, *args, **kwargs) raise DeprecatedConfig(msg=stdmsg) else: self.warn(stdmsg, *args, **kwargs)
**** CubicPower OpenStack Study **** def process(self, msg, kwargs): # NOTE(mrodden): catch any Message/other object and # coerce to unicode before they can get # to the python logging and possibly # cause string encoding trouble if not isinstance(msg, six.string_types): msg = six.text_type(msg) if 'extra' not in kwargs: kwargs['extra'] = {} extra = kwargs['extra'] context = kwargs.pop('context', None) if not context: context = getattr(local.store, 'context', None) if context: extra.update(_dictify_context(context)) instance = kwargs.pop('instance', None) instance_uuid = (extra.get('instance_uuid', None) or kwargs.pop('instance_uuid', None)) instance_extra = '' if instance: instance_extra = CONF.instance_format % instance elif instance_uuid: instance_extra = (CONF.instance_uuid_format % {'uuid': instance_uuid}) extra.update({'instance': instance_extra}) extra.update({"project": self.project}) extra.update({"version": self.version}) extra['extra'] = extra.copy() return msg, kwargs
**** CubicPower OpenStack Study **** class JSONFormatter(logging.Formatter):
**** CubicPower OpenStack Study **** def __init__(self, fmt=None, datefmt=None): # NOTE(jkoelker) we ignore the fmt argument, but its still there # since logging.config.fileConfig passes it. self.datefmt = datefmt
**** CubicPower OpenStack Study **** def formatException(self, ei, strip_newlines=True): lines = traceback.format_exception(*ei) if strip_newlines: lines = [moves.filter( lambda x: x, line.rstrip().splitlines()) for line in lines] lines = list(itertools.chain(*lines)) return lines
**** CubicPower OpenStack Study **** def format(self, record): message = {'message': record.getMessage(), 'asctime': self.formatTime(record, self.datefmt), 'name': record.name, 'msg': record.msg, 'args': record.args, 'levelname': record.levelname, 'levelno': record.levelno, 'pathname': record.pathname, 'filename': record.filename, 'module': record.module, 'lineno': record.lineno, 'funcname': record.funcName, 'created': record.created, 'msecs': record.msecs, 'relative_created': record.relativeCreated, 'thread': record.thread, 'thread_name': record.threadName, 'process_name': record.processName, 'process': record.process, 'traceback': None} if hasattr(record, 'extra'): message['extra'] = record.extra if record.exc_info: message['traceback'] = self.formatException(record.exc_info) return jsonutils.dumps(message) def _create_logging_excepthook(product_name):
**** CubicPower OpenStack Study **** def _create_logging_excepthook(product_name):
**** CubicPower OpenStack Study **** def logging_excepthook(exc_type, value, tb): extra = {} if CONF.verbose or CONF.debug: extra['exc_info'] = (exc_type, value, tb) getLogger(product_name).critical( "".join(traceback.format_exception_only(exc_type, value)), **extra) return logging_excepthook
**** CubicPower OpenStack Study **** class LogConfigError(Exception): message = _('Error loading logging config %(log_config)s: %(err_msg)s')
**** CubicPower OpenStack Study **** def __init__(self, log_config, err_msg): self.log_config = log_config self.err_msg = err_msg
**** CubicPower OpenStack Study **** def __str__(self): return self.message % dict(log_config=self.log_config, err_msg=self.err_msg) def _load_log_config(log_config_append): try: logging.config.fileConfig(log_config_append, disable_existing_loggers=False) except moves.configparser.Error as exc: raise LogConfigError(log_config_append, str(exc)) def setup(product_name): """Setup logging.""" if CONF.log_config_append: _load_log_config(CONF.log_config_append) else: _setup_logging_from_conf() sys.excepthook = _create_logging_excepthook(product_name) def set_defaults(logging_context_format_string): cfg.set_defaults(log_opts, logging_context_format_string= logging_context_format_string) def _find_facility_from_conf(): facility_names = logging.handlers.SysLogHandler.facility_names facility = getattr(logging.handlers.SysLogHandler, CONF.syslog_log_facility, None) if facility is None and CONF.syslog_log_facility in facility_names: facility = facility_names.get(CONF.syslog_log_facility) if facility is None: valid_facilities = facility_names.keys() consts = ['LOG_AUTH', 'LOG_AUTHPRIV', 'LOG_CRON', 'LOG_DAEMON', 'LOG_FTP', 'LOG_KERN', 'LOG_LPR', 'LOG_MAIL', 'LOG_NEWS', 'LOG_AUTH', 'LOG_SYSLOG', 'LOG_USER', 'LOG_UUCP', 'LOG_LOCAL0', 'LOG_LOCAL1', 'LOG_LOCAL2', 'LOG_LOCAL3', 'LOG_LOCAL4', 'LOG_LOCAL5', 'LOG_LOCAL6', 'LOG_LOCAL7'] valid_facilities.extend(consts) raise TypeError(_('syslog facility must be one of: %s') % ', '.join("'%s'" % fac for fac in valid_facilities)) return facility
**** CubicPower OpenStack Study **** def _load_log_config(log_config_append): try: logging.config.fileConfig(log_config_append, disable_existing_loggers=False) except moves.configparser.Error as exc: raise LogConfigError(log_config_append, str(exc))
**** CubicPower OpenStack Study **** def setup(product_name): """Setup logging.""" if CONF.log_config_append: _load_log_config(CONF.log_config_append) else: _setup_logging_from_conf() sys.excepthook = _create_logging_excepthook(product_name)
**** CubicPower OpenStack Study **** def set_defaults(logging_context_format_string): cfg.set_defaults(log_opts, logging_context_format_string= logging_context_format_string)
**** CubicPower OpenStack Study **** def _find_facility_from_conf(): facility_names = logging.handlers.SysLogHandler.facility_names facility = getattr(logging.handlers.SysLogHandler, CONF.syslog_log_facility, None) if facility is None and CONF.syslog_log_facility in facility_names: facility = facility_names.get(CONF.syslog_log_facility) if facility is None: valid_facilities = facility_names.keys() consts = ['LOG_AUTH', 'LOG_AUTHPRIV', 'LOG_CRON', 'LOG_DAEMON', 'LOG_FTP', 'LOG_KERN', 'LOG_LPR', 'LOG_MAIL', 'LOG_NEWS', 'LOG_AUTH', 'LOG_SYSLOG', 'LOG_USER', 'LOG_UUCP', 'LOG_LOCAL0', 'LOG_LOCAL1', 'LOG_LOCAL2', 'LOG_LOCAL3', 'LOG_LOCAL4', 'LOG_LOCAL5', 'LOG_LOCAL6', 'LOG_LOCAL7'] valid_facilities.extend(consts) raise TypeError(_('syslog facility must be one of: %s') % ', '.join("'%s'" % fac for fac in valid_facilities)) return facility
**** CubicPower OpenStack Study **** class RFCSysLogHandler(logging.handlers.SysLogHandler):
**** CubicPower OpenStack Study **** def __init__(self, *args, **kwargs): self.binary_name = _get_binary_name() super(RFCSysLogHandler, self).__init__(*args, **kwargs)
**** CubicPower OpenStack Study **** def format(self, record): msg = super(RFCSysLogHandler, self).format(record) msg = self.binary_name + ' ' + msg return msg def _setup_logging_from_conf(): log_root = getLogger(None).logger for handler in log_root.handlers: log_root.removeHandler(handler) if CONF.use_syslog: facility = _find_facility_from_conf() # TODO(bogdando) use the format provided by RFCSysLogHandler # after existing syslog format deprecation in J if CONF.use_syslog_rfc_format: syslog = RFCSysLogHandler(address='/dev/log', facility=facility) else: syslog = logging.handlers.SysLogHandler(address='/dev/log', facility=facility) log_root.addHandler(syslog) logpath = _get_log_file_path() if logpath: filelog = logging.handlers.WatchedFileHandler(logpath) log_root.addHandler(filelog) if CONF.use_stderr: streamlog = ColorHandler() log_root.addHandler(streamlog) elif not logpath: # pass sys.stdout as a positional argument # python2.6 calls the argument strm, in 2.7 it's stream streamlog = logging.StreamHandler(sys.stdout) log_root.addHandler(streamlog) if CONF.publish_errors: handler = importutils.import_object( "nova.openstack.common.log_handler.PublishErrorsHandler", logging.ERROR) log_root.addHandler(handler) datefmt = CONF.log_date_format for handler in log_root.handlers: # NOTE(alaski): CONF.log_format overrides everything currently. This # should be deprecated in favor of context aware formatting. if CONF.log_format: handler.setFormatter(logging.Formatter(fmt=CONF.log_format, datefmt=datefmt)) log_root.info('Deprecated: log_format is now deprecated and will ' 'be removed in the next release') else: handler.setFormatter(ContextFormatter(datefmt=datefmt)) if CONF.debug: log_root.setLevel(logging.DEBUG) elif CONF.verbose: log_root.setLevel(logging.INFO) else: log_root.setLevel(logging.WARNING) for pair in CONF.default_log_levels: mod, _sep, level_name = pair.partition('=') level = logging.getLevelName(level_name) logger = logging.getLogger(mod) logger.setLevel(level) _loggers = {} def getLogger(name='unknown', version='unknown'): if name not in _loggers: _loggers[name] = ContextAdapter(logging.getLogger(name), name, version) return _loggers[name] def getLazyLogger(name='unknown', version='unknown'): """Returns lazy logger. Creates a pass-through logger that does not create the real logger until it is really needed and delegates all calls to the real logger once it is created. """ return LazyAdapter(name, version)
**** CubicPower OpenStack Study **** def _setup_logging_from_conf(): log_root = getLogger(None).logger for handler in log_root.handlers: log_root.removeHandler(handler) if CONF.use_syslog: facility = _find_facility_from_conf() # TODO(bogdando) use the format provided by RFCSysLogHandler # after existing syslog format deprecation in J if CONF.use_syslog_rfc_format: syslog = RFCSysLogHandler(address='/dev/log', facility=facility) else: syslog = logging.handlers.SysLogHandler(address='/dev/log', facility=facility) log_root.addHandler(syslog) logpath = _get_log_file_path() if logpath: filelog = logging.handlers.WatchedFileHandler(logpath) log_root.addHandler(filelog) if CONF.use_stderr: streamlog = ColorHandler() log_root.addHandler(streamlog) elif not logpath: # pass sys.stdout as a positional argument # python2.6 calls the argument strm, in 2.7 it's stream streamlog = logging.StreamHandler(sys.stdout) log_root.addHandler(streamlog) if CONF.publish_errors: handler = importutils.import_object( "nova.openstack.common.log_handler.PublishErrorsHandler", logging.ERROR) log_root.addHandler(handler) datefmt = CONF.log_date_format for handler in log_root.handlers: # NOTE(alaski): CONF.log_format overrides everything currently. This # should be deprecated in favor of context aware formatting. if CONF.log_format: handler.setFormatter(logging.Formatter(fmt=CONF.log_format, datefmt=datefmt)) log_root.info('Deprecated: log_format is now deprecated and will ' 'be removed in the next release') else: handler.setFormatter(ContextFormatter(datefmt=datefmt)) if CONF.debug: log_root.setLevel(logging.DEBUG) elif CONF.verbose: log_root.setLevel(logging.INFO) else: log_root.setLevel(logging.WARNING) for pair in CONF.default_log_levels: mod, _sep, level_name = pair.partition('=') level = logging.getLevelName(level_name) logger = logging.getLogger(mod) logger.setLevel(level) _loggers = {}
**** CubicPower OpenStack Study **** def getLogger(name='unknown', version='unknown'): if name not in _loggers: _loggers[name] = ContextAdapter(logging.getLogger(name), name, version) return _loggers[name]
**** CubicPower OpenStack Study **** def getLazyLogger(name='unknown', version='unknown'): """Returns lazy logger. Creates a pass-through logger that does not create the real logger until it is really needed and delegates all calls to the real logger once it is created. """ return LazyAdapter(name, version)
**** CubicPower OpenStack Study **** class WritableLogger(object): """A thin wrapper that responds to `write` and logs."""
**** CubicPower OpenStack Study **** def __init__(self, logger, level=logging.INFO): self.logger = logger self.level = level
**** CubicPower OpenStack Study **** def write(self, msg): self.logger.log(self.level, msg.rstrip())
**** CubicPower OpenStack Study **** class ContextFormatter(logging.Formatter): """A context.RequestContext aware formatter configured through flags. The flags used to set format strings are: logging_context_format_string and logging_
**** CubicPower OpenStack Study **** def format(self, record): """Uses contextstring if request_id is set, otherwise default.""" # NOTE(sdague): default the fancier formatting params # to an empty string so we don't throw an exception if # they get used for key in ('instance', 'color'): if key not in record.__dict__: record.__dict__[key] = '' if record.__dict__.get('request_id', None): self._fmt = CONF.logging_context_format_string else: self._fmt = CONF.logging_default_format_string if (record.levelno == logging.DEBUG and CONF.logging_debug_format_suffix): self._fmt += " " + CONF.logging_debug_format_suffix # Cache this on the record, Logger will respect our formatted copy if record.exc_info: record.exc_text = self.formatException(record.exc_info, record) return logging.Formatter.format(self, record)
**** CubicPower OpenStack Study **** def formatException(self, exc_info, record=None): """Format exception output with CONF.logging_exception_prefix.""" if not record: return logging.Formatter.formatException(self, exc_info) stringbuffer = moves.StringIO() traceback.print_exception(exc_info[0], exc_info[1], exc_info[2], None, stringbuffer) lines = stringbuffer.getvalue().split('\n') stringbuffer.close() if CONF.logging_exception_prefix.find('%(asctime)') != -1: record.asctime = self.formatTime(record, self.datefmt) formatted_lines = [] for line in lines: pl = CONF.logging_exception_prefix % record.__dict__ fl = '%s%s' % (pl, line) formatted_lines.append(fl) return '\n'.join(formatted_lines)
**** CubicPower OpenStack Study **** class ColorHandler(logging.StreamHandler): LEVEL_COLORS = { logging.DEBUG: '\033[00;32m', # GREEN logging.INFO: '\033[00;36m', # CYAN logging.AUDIT: '\033[01;36m', # BOLD CYAN logging.WARN: '\033[01;33m', # BOLD YELLOW logging.ERROR: '\033[01;31m', # BOLD RED logging.CRITICAL: '\033[01;31m', # BOLD RED }
**** CubicPower OpenStack Study **** def format(self, record): record.color = self.LEVEL_COLORS[record.levelno] return logging.StreamHandler.format(self, record)
**** CubicPower OpenStack Study **** class DeprecatedConfig(Exception): message = _("Fatal call to deprecated config: %(msg)s")
**** CubicPower OpenStack Study **** def __init__(self, msg): super(Exception, self).__init__(self.message % dict(msg=msg))
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