510 lines
21 KiB
Python
510 lines
21 KiB
Python
# -*- coding: utf-8 -*-
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"pretty small and local configuration management tool"
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# Copyright (C) 2012-2013 Team tiramisu (see AUTHORS for all contributors)
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# The original `Config` design model is unproudly borrowed from
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# the rough pypy's guys: http://codespeak.net/svn/pypy/dist/pypy/config/
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# the whole pypy projet is under MIT licence
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# ____________________________________________________________
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#from inspect import getmembers, ismethod
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from tiramisu.error import PropertiesOptionError, ConflictOptionError
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from tiramisu.option import OptionDescription, Option, SymLinkOption
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from tiramisu.setting import groups, Setting, apply_requires
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from tiramisu.value import Values
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from tiramisu.i18n import _
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class SubConfig(object):
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"sub configuration management entry"
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__slots__ = ('_cfgimpl_descr', '_cfgimpl_context')
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def __init__(self, descr, context):
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""" Configuration option management master class
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:param descr: describes the configuration schema
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:type descr: an instance of ``option.OptionDescription``
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:param context: the current root config
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:type context: `Config`
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"""
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# main option description
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if not isinstance(descr, OptionDescription):
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raise ValueError(_('descr must be an optiondescription, not {0}').format(type(descr)))
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self._cfgimpl_descr = descr
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# sub option descriptions
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self._cfgimpl_context = context
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def cfgimpl_get_context(self):
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return self._cfgimpl_context
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def cfgimpl_get_settings(self):
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return self._cfgimpl_context._cfgimpl_settings
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def cfgimpl_get_values(self):
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return self._cfgimpl_context._cfgimpl_values
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def cfgimpl_get_consistancies(self):
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return self.cfgimpl_get_context().cfgimpl_get_description()._consistancies
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def cfgimpl_get_description(self):
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return self._cfgimpl_descr
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# ____________________________________________________________
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# attribute methods
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def __setattr__(self, name, value):
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"attribute notation mechanism for the setting of the value of an option"
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if name.startswith('_cfgimpl_'):
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#self.__dict__[name] = value
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object.__setattr__(self, name, value)
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return
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self._setattr(name, value)
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def _setattr(self, name, value, force_permissive=False):
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if '.' in name:
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homeconfig, name = self.cfgimpl_get_home_by_path(name)
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return homeconfig.__setattr__(name, value)
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child = getattr(self._cfgimpl_descr, name)
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if type(child) != SymLinkOption:
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self.setoption(name, child, value, force_permissive)
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else:
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child.setoption(self.cfgimpl_get_context(), value)
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def __getattr__(self, name):
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return self._getattr(name)
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def _getattr(self, name, force_permissive=False, force_properties=None,
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validate=True):
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"""
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attribute notation mechanism for accessing the value of an option
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:param name: attribute name
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:return: option's value if name is an option name, OptionDescription
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otherwise
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"""
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# attribute access by passing a path,
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# for instance getattr(self, "creole.general.family.adresse_ip_eth0")
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if '.' in name:
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homeconfig, name = self.cfgimpl_get_home_by_path(name,
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force_permissive=force_permissive,
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force_properties=force_properties)
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return homeconfig._getattr(name, force_permissive=force_permissive,
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force_properties=force_properties,
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validate=validate)
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# special attributes
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if name.startswith('_cfgimpl_'):
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# if it were in __dict__ it would have been found already
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object.__getattr__(self, name)
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opt_or_descr = getattr(self._cfgimpl_descr, name)
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# symlink options
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if isinstance(opt_or_descr, SymLinkOption):
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rootconfig = self.cfgimpl_get_context()
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path = rootconfig.cfgimpl_get_description().get_path_by_opt(opt_or_descr.opt)
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return rootconfig._getattr(path, validate=validate,
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force_properties=force_properties,
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force_permissive=force_permissive)
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elif isinstance(opt_or_descr, OptionDescription):
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self.cfgimpl_get_settings().validate_properties(opt_or_descr,
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True, False,
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force_permissive=force_permissive,
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force_properties=force_properties)
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children = self.cfgimpl_get_description()._children
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if opt_or_descr not in children[1]:
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raise AttributeError(_("{0} with name {1} object has "
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"no attribute {2}").format(self.__class__,
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opt_or_descr._name,
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name))
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return SubConfig(opt_or_descr, self._cfgimpl_context)
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else:
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value = self.cfgimpl_get_values()._getitem(opt_or_descr,
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validate=validate,
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force_properties=force_properties,
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force_permissive=force_permissive)
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return value
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def setoption(self, name, child, value, force_permissive=False):
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"""effectively modifies the value of an Option()
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(typically called by the __setattr__)
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"""
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#needed ?
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apply_requires(child, self)
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if child not in self._cfgimpl_descr._children[1]:
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raise AttributeError(_('unknown option {0}').format(name))
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self.cfgimpl_get_values()[child] = value
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def cfgimpl_get_home_by_path(self, path, force_permissive=False, force_properties=None):
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""":returns: tuple (config, name)"""
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path = path.split('.')
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for step in path[:-1]:
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self = self._getattr(step,
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force_permissive=force_permissive,
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force_properties=force_properties)
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return self, path[-1]
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def getkey(self):
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return self._cfgimpl_descr.getkey(self)
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def __hash__(self):
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return hash(self.getkey())
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def __eq__(self, other):
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"Config comparison"
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if not isinstance(other, Config):
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return False
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return self.getkey() == other.getkey()
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def __ne__(self, other):
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"Config comparison"
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return not self == other
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# ______________________________________________________________________
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def __iter__(self):
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"""Pythonesque way of parsing group's ordered options.
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iteration only on Options (not OptionDescriptions)"""
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for child in self._cfgimpl_descr._children[1]:
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if not isinstance(child, OptionDescription):
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try:
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yield child._name, getattr(self, child._name)
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except GeneratorExit:
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raise StopIteration
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except PropertiesOptionError:
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pass # option with properties
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def iter_all(self):
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"""A way of parsing options **and** groups.
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iteration on Options and OptionDescriptions."""
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for child in self._cfgimpl_descr._children[1]:
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try:
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yield child._name, getattr(self, child._name)
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except GeneratorExit:
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raise StopIteration
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except PropertiesOptionError:
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pass # option with properties
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def iter_groups(self, group_type=None):
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"""iteration on groups objects only.
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All groups are returned if `group_type` is `None`, otherwise the groups
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can be filtered by categories (families, or whatever).
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:param group_type: if defined, is an instance of `groups.GroupType`
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or `groups.MasterGroupType` that lives in
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`setting.groups`
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"""
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if group_type is not None:
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if not isinstance(group_type, groups.GroupType):
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raise TypeError(_("unknown group_type: {0}").format(group_type))
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for child in self._cfgimpl_descr._children[1]:
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if isinstance(child, OptionDescription):
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try:
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if group_type is not None:
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if child.get_group_type() == group_type:
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yield child._name, getattr(self, child._name)
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else:
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yield child._name, getattr(self, child._name)
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except GeneratorExit:
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raise StopIteration
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except PropertiesOptionError:
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pass
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# ______________________________________________________________________
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def __str__(self):
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"Config's string representation"
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lines = []
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for name, grp in self.iter_groups():
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lines.append("[%s]" % name)
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for name, value in self:
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try:
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lines.append("%s = %s" % (name, value))
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except PropertiesOptionError:
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pass
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return '\n'.join(lines)
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__repr__ = __str__
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def getpaths(self, include_groups=False, allpaths=False):
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"""returns a list of all paths in self, recursively, taking care of
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the context of properties (hidden/disabled)
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:param include_groups: if true, OptionDescription are included
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:param allpaths: all the options (event the properties protected ones)
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:returns: list of all paths
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"""
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paths = []
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for path in self._cfgimpl_descr.getpaths(include_groups=include_groups):
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if allpaths:
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paths.append(path)
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else:
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try:
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getattr(self, path)
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except PropertiesOptionError:
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pass
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else:
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paths.append(path)
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return paths
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def getpath(self):
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descr = self.cfgimpl_get_description()
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context_descr = self.cfgimpl_get_context().cfgimpl_get_description()
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return context_descr.get_path_by_opt(descr)
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def find(self, bytype=None, byname=None, byvalue=None, type_='option'):
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"""
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finds a list of options recursively in the config
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:param bytype: Option class (BoolOption, StrOption, ...)
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:param byname: filter by Option._name
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:param byvalue: filter by the option's value
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:returns: list of matching Option objects
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"""
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return self.cfgimpl_get_context()._find(bytype, byname, byvalue,
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first=False,
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type_=type_,
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_subpath=self.getpath())
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def find_first(self, bytype=None, byname=None, byvalue=None, type_='option'):
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"""
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finds an option recursively in the config
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:param bytype: Option class (BoolOption, StrOption, ...)
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:param byname: filter by Option._name
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:param byvalue: filter by the option's value
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:returns: list of matching Option objects
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"""
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return self.cfgimpl_get_context()._find(bytype, byname, byvalue,
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first=True,
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type_=type_,
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_subpath=self.getpath())
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def make_dict(self, flatten=False, _currpath=None, withoption=None, withvalue=None):
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"""export the whole config into a `dict`
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:returns: dict of Option's name (or path) and values"""
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pathsvalues = []
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if _currpath is None:
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_currpath = []
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if withoption is None and withvalue is not None:
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raise ValueError(_("make_dict can't filtering with value without option"))
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if withoption is not None:
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mypath = self.getpath()
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for path in self.cfgimpl_get_context()._find(bytype=Option,
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byname=withoption,
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byvalue=withvalue,
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first=False,
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type_='path',
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_subpath=mypath):
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path = '.'.join(path.split('.')[:-1])
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opt = self.cfgimpl_get_context().cfgimpl_get_description().get_opt_by_path(path)
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if mypath is not None:
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if mypath == path:
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withoption = None
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withvalue = None
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break
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else:
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tmypath = mypath + '.'
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if not path.startswith(tmypath):
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raise AttributeError(_('unexpected path {0}, '
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'should start with {1}').format(path, mypath))
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path = path[len(tmypath):]
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self._make_sub_dict(opt, path, pathsvalues, _currpath, flatten)
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#withoption can be set to None below !
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if withoption is None:
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for opt in self.cfgimpl_get_description().getchildren():
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path = opt._name
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self._make_sub_dict(opt, path, pathsvalues, _currpath, flatten)
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if _currpath == []:
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options = dict(pathsvalues)
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return options
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return pathsvalues
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def _make_sub_dict(self, opt, path, pathsvalues, _currpath, flatten):
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if isinstance(opt, OptionDescription):
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pathsvalues += getattr(self, path).make_dict(flatten,
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_currpath + path.split('.'))
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else:
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try:
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value = self._getattr(opt._name)
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if flatten:
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name = opt._name
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else:
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name = '.'.join(_currpath + [opt._name])
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pathsvalues.append((name, value))
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except PropertiesOptionError:
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pass # this just a hidden or disabled option
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# ____________________________________________________________
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class Config(SubConfig):
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"main configuration management entry"
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__slots__ = ('_cfgimpl_settings', '_cfgimpl_values')
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def __init__(self, descr):
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""" Configuration option management master class
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:param descr: describes the configuration schema
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:type descr: an instance of ``option.OptionDescription``
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:param context: the current root config
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:type context: `Config`
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"""
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self._cfgimpl_settings = Setting(self)
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self._cfgimpl_values = Values(self)
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super(Config, self).__init__(descr, self) # , slots)
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self._cfgimpl_build_all_paths()
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def _cfgimpl_build_all_paths(self):
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self._cfgimpl_descr.build_cache()
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def unwrap_from_path(self, path):
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"""convenience method to extract and Option() object from the Config()
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and it is **fast**: finds the option directly in the appropriate
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namespace
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:returns: Option()
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"""
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if '.' in path:
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homeconfig, path = self.cfgimpl_get_home_by_path(path)
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return getattr(homeconfig._cfgimpl_descr, path)
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return getattr(self._cfgimpl_descr, path)
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def set(self, **kwargs):
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"""
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do what I mean"-interface to option setting. Searches all paths
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starting from that config for matches of the optional arguments
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and sets the found option if the match is not ambiguous.
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:param kwargs: dict of name strings to values.
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"""
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#opts, paths = self.cfgimpl_get_description()._cache_paths
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all_paths = [p.split(".") for p in self.getpaths(allpaths=True)]
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for key, value in kwargs.iteritems():
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key_p = key.split('.')
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candidates = [p for p in all_paths if p[-len(key_p):] == key_p]
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if len(candidates) == 1:
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name = '.'.join(candidates[0])
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homeconfig, name = self.cfgimpl_get_home_by_path(name)
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getattr(homeconfig, name)
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#except MandatoryError:
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# pass
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#except PropertiesOptionError, e:
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# raise e # HiddenOptionError or DisabledOptionError
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child = getattr(homeconfig._cfgimpl_descr, name)
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homeconfig.setoption(name, child, value)
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elif len(candidates) > 1:
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raise ConflictOptionError(
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_('more than one option that ends with {}').format(key))
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else:
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raise AttributeError(
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_('there is no option that matches {}'
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' or the option is hidden or disabled').format(key))
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def getpath(self):
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return None
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def _find(self, bytype, byname, byvalue, first, type_='option',
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_subpath=None):
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"""
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convenience method for finding an option that lives only in the subtree
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:param first: return only one option if True, a list otherwise
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:return: find list or an exception if nothing has been found
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"""
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def _filter_by_name():
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if byname is None:
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return True
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if path == byname or path.endswith('.' + byname):
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return True
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else:
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return False
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def _filter_by_value():
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if byvalue is None:
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return True
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try:
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value = getattr(self, path)
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if value == byvalue:
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return True
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except PropertiesOptionError: # a property restricts the access of the value
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pass
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return False
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def _filter_by_type():
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if bytype is None:
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return True
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if isinstance(option, bytype):
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return True
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return False
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#def _filter_by_attrs():
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# if byattrs is None:
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# return True
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# for key, val in byattrs.items():
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# print "----", path, key
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# if path == key or path.endswith('.' + key):
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# if value == val:
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# return True
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# else:
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# return False
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# return False
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if type_ not in ('option', 'path', 'value'):
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raise ValueError(_('unknown type_ type {0} for _find').format(type_))
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find_results = []
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opts, paths = self.cfgimpl_get_description()._cache_paths
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for index in range(0, len(paths)):
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option = opts[index]
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if isinstance(option, OptionDescription):
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continue
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path = paths[index]
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if _subpath is not None and not path.startswith(_subpath + '.'):
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continue
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if not _filter_by_name():
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continue
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if not _filter_by_value():
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continue
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#remove option with propertyerror, ...
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try:
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value = getattr(self, path)
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except PropertiesOptionError: # a property restricts the access of the value
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continue
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if not _filter_by_type():
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continue
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#if not _filter_by_attrs():
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# continue
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if type_ == 'value':
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retval = value
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elif type_ == 'path':
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retval = path
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else:
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retval = option
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if first:
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return retval
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else:
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find_results.append(retval)
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if find_results == []:
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raise AttributeError(_("no option found in config with these criteria"))
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else:
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return find_results
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def mandatory_warnings(config):
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"""convenience function to trace Options that are mandatory and
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where no value has been set
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:returns: generator of mandatory Option's path
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"""
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for path in config.cfgimpl_get_description().getpaths(include_groups=True):
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try:
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config._getattr(path, force_properties=('mandatory',))
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except PropertiesOptionError, err:
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if err.proptype == ['mandatory']:
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yield path
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