/usr/share/pyshared/metaconfig/mconf.py is in python-metaconfig 0.1.4a1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (c) 2010, Science & Technology Facilities Council (STFC)
# All rights reserved.
#
# See the LICENSE file in the source distribution of this software for
# the full license text.
"""
metaconfig
----------
We want to do:
{{{
import metaconfig
# Config is a ConfigParser instance (or subclass)
# Returns the lowest level config file available (e.g. if __name__ == 'foo.bar.baz' and there is a config
# defined for 'foo.bar' use that.
config = metaconfig.get_config(__name__)
}}}
These options are bootstraped on entry into Python as:
{{{
import metaconfig
metaconfig.add_config_file(name, path)
metaconfig.add_config(name, configParser)
metaconfig.metaconfig(metaconfig)
metaconfig.metaconfig_file(metaconfig_file)
metaconfig.from_argv()
or something like that
}}}
"""
import sys
import configparser
import re
import logging
import logging.config
log = logging.getLogger(__name__)
class Error(Exception):
pass
DEFAULT_CONFIG_PARSER = configparser.ConfigParser
class MetaConfig(object):
def __init__(self):
self._configs = {}
def add_config_file(self, name, path, ConfigClass=DEFAULT_CONFIG_PARSER):
log.info('Adding config %s from path %s' % (name, path))
conf = ConfigClass()
conf.read([path])
return self.add_config(name, conf)
def add_config_fh(self, name, fileobj, ConfigClass=DEFAULT_CONFIG_PARSER):
log.info('Adding config %s from file object' % name)
conf = ConfigClass()
conf.readfp(fileobj)
return self.add_config(name, conf)
def add_config(self, name, config_parser):
if name in self._configs:
Error("Config %s already exists" % name)
else:
config_parser.__config_name__ = name
self._configs[name] = config_parser
log.info('Config %s added' % name)
return config_parser
def get_config(self, name, ConfigClass=DEFAULT_CONFIG_PARSER, inherit=True):
log.debug('Requested config %s, inherit=%s' % (name, inherit))
if inherit:
parts = name.split('.')
while parts:
name1 = '.'.join(parts)
log.debug("Looking for config %s" % name1)
try:
config = self._configs[name1]
log.debug("Selected config %s" % name1)
return config
except KeyError:
parts = parts[:-1]
if name in self._configs:
log.debug("Selecting config %s" % name)
return self._configs[name]
else:
config = self.add_config(name, ConfigClass())
log.debug("New config %s" % name)
return config
@classmethod
def from_config(klass, config_parser):
mf = klass()
mf._setup_logging(config_parser)
mf._parse_nested_configs(config_parser)
mf._parse_external_configs(config_parser)
return mf
@classmethod
def from_config_file(klass, config_file):
cnf = DEFAULT_CONFIG_PARSER()
cnf.read(config_file)
return klass.from_config(cnf)
@classmethod
def from_config_fh(klass, config_fh):
cnf = DEFAULT_CONFIG_PARSER()
cnf.readfp(config_fh)
return klass.from_config(cnf)
def _parse_nested_configs(self, config_parser):
"""
Parse configs embedded in the metaconfig file.
"""
if not config_parser.has_option('metaconfig', 'configs'):
return
configs = config_parser.get('metaconfig', 'configs').split()
D = {}
for section in config_parser.sections():
mo = re.match(r'(.+?):(.+)', section)
if not mo:
continue
prefix, ssec = mo.groups()
D.setdefault(prefix, []).append(ssec)
for config in configs:
cp = DEFAULT_CONFIG_PARSER()
for ssec in D[config]:
sec = '%s:%s' % (config, ssec)
if ssec.lower() == 'default':
defaults = cp.defaults()
for option in config_parser.options(sec):
defaults[option] = config_parser.get(sec, option,
raw=True)
else:
cp.add_section(ssec)
for option in config_parser.options(sec):
cp.set(ssec, option, config_parser.get(sec, option,
raw=True))
self.add_config(config, cp)
def _parse_external_configs(self, config_parser):
"""
Parse external config files referenced in metaconfig.conf.
"""
pass
#!FIXME: need to name each config.
#if not config_parser.has_option('metaconfig', 'config-files'):
# return
#
#config_files = config_parser.get('metaconfig', 'config-files').split()
#for cf in config_files:
# self.add_config_file(cf)
def _setup_logging(self, config_parser):
"""
Initialise logging from a nested config.
"""
if not config_parser.has_option('metaconfig', 'logging'):
return
logging_file = config_parser.get('metaconfig', 'logging')
logging.config.fileConfig(logging_file)
log.info('Logging configuration initialised from %s' % logging_file)
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