456 lines
20 KiB
Python
456 lines
20 KiB
Python
# -*- coding: utf-8 -*-
|
||
"pretty small and local configuration management tool"
|
||
# Copyright (C) 2012 Team tiramisu (see README for all contributors)
|
||
#
|
||
# This program is free software; you can redistribute it and/or modify
|
||
# it under the terms of the GNU General Public License as published by
|
||
# the Free Software Foundation; either version 2 of the License, or
|
||
# (at your option) any later version.
|
||
#
|
||
# This program is distributed in the hope that it will be useful,
|
||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
# GNU General Public License for more details.
|
||
#
|
||
# You should have received a copy of the GNU General Public License
|
||
# along with this program; if not, write to the Free Software
|
||
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||
#
|
||
# The original `Config` design model is unproudly borrowed from
|
||
# the rough gus of pypy: pypy: http://codespeak.net/svn/pypy/dist/pypy/config/
|
||
# the whole pypy projet is under MIT licence
|
||
# ____________________________________________________________
|
||
from error import (HiddenOptionError, ConfigError, NotFoundError,
|
||
AmbigousOptionError, ConflictConfigError, NoMatchingOptionFound,
|
||
SpecialOwnersError, MandatoryError, MethodCallError,
|
||
DisabledOptionError, ModeOptionError)
|
||
from option import (OptionDescription, Option, SymLinkOption, group_types,
|
||
apply_requires, modes)
|
||
import autolib
|
||
from autolib import special_owners, special_owner_factory
|
||
# ____________________________________________________________
|
||
class Config(object):
|
||
_cfgimpl_hidden = True
|
||
_cfgimpl_disabled = True
|
||
_cfgimpl_mandatory = True
|
||
_cfgimpl_frozen = False
|
||
_cfgimpl_owner = "user"
|
||
_cfgimpl_toplevel = None
|
||
_cfgimpl_mode = 'normal'
|
||
|
||
def __init__(self, descr, parent=None, **overrides):
|
||
self._cfgimpl_descr = descr
|
||
self._cfgimpl_value_owners = {}
|
||
self._cfgimpl_parent = parent
|
||
# `Config()` indeed supports the configuration `Option()`'s values...
|
||
self._cfgimpl_values = {}
|
||
self._cfgimpl_previous_values = {}
|
||
# XXX warnings are a great idea, let's make up a better use of it
|
||
self._cfgimpl_warnings = []
|
||
self._cfgimpl_toplevel = self._cfgimpl_get_toplevel()
|
||
# `freeze()` allows us to carry out this calculation again if necessary
|
||
self._cfgimpl_frozen = self._cfgimpl_toplevel._cfgimpl_frozen
|
||
#
|
||
self._cfgimpl_build(overrides)
|
||
|
||
def _validate_duplicates(self, children):
|
||
duplicates = []
|
||
for dup in children:
|
||
if dup._name not in duplicates:
|
||
duplicates.append(dup._name)
|
||
else:
|
||
raise ConflictConfigError('duplicate option name: <%s>' % \
|
||
dup._name)
|
||
|
||
def _cfgimpl_build(self, overrides):
|
||
self._validate_duplicates(self._cfgimpl_descr._children)
|
||
for child in self._cfgimpl_descr._children:
|
||
if isinstance(child, Option):
|
||
self._cfgimpl_values[child._name] = child.getdefault()
|
||
self._cfgimpl_value_owners[child._name] = 'default'
|
||
elif isinstance(child, OptionDescription):
|
||
self._validate_duplicates(child._children)
|
||
self._cfgimpl_values[child._name] = Config(child, parent=self)
|
||
self.override(overrides)
|
||
|
||
def cfgimpl_update(self):
|
||
"dynamically adds `Option()` or `OptionDescription()`"
|
||
# Nothing is static. Everything evolve.
|
||
# FIXME this is an update for new options in the schema only
|
||
# see the update_child() method of the descr object
|
||
for child in self._cfgimpl_descr._children:
|
||
if isinstance(child, Option):
|
||
if child._name not in self._cfgimpl_values:
|
||
self._cfgimpl_values[child._name] = child.getdefault()
|
||
self._cfgimpl_value_owners[child._name] = 'default'
|
||
elif isinstance(child, OptionDescription):
|
||
if child._name not in self._cfgimpl_values:
|
||
self._cfgimpl_values[child._name] = Config(child, parent=self)
|
||
|
||
def override(self, overrides):
|
||
for name, value in overrides.iteritems():
|
||
homeconfig, name = self._cfgimpl_get_home_by_path(name)
|
||
# if there are special_owners, impossible to override
|
||
if homeconfig._cfgimpl_value_owners[name] in special_owners:
|
||
raise SpecialOwnersError("cannot override option: {0} because "
|
||
"of its special owner".format(name))
|
||
homeconfig.setoption(name, value, 'default')
|
||
|
||
def cfgimpl_set_owner(self, owner):
|
||
self._cfgimpl_owner = owner
|
||
for child in self._cfgimpl_descr._children:
|
||
if isinstance(child, OptionDescription):
|
||
self._cfgimpl_values[child._name].cfgimpl_set_owner(owner)
|
||
# ____________________________________________________________
|
||
def cfgimpl_hide(self):
|
||
if self._cfgimpl_parent != None:
|
||
raise MethodCallError("this method root_hide() shall not be"
|
||
"used with non-root Config() object")
|
||
rootconfig = self._cfgimpl_get_toplevel()
|
||
rootconfig._cfgimpl_hidden = True
|
||
|
||
def cfgimpl_show(self):
|
||
if self._cfgimpl_parent != None:
|
||
raise MethodCallError("this method root_hide() shall not be"
|
||
"used with non-root Config() object")
|
||
rootconfig = self._cfgimpl_get_toplevel()
|
||
rootconfig._cfgimpl_hidden = False
|
||
# ____________________________________________________________
|
||
def cfgimpl_disable(self):
|
||
if self._cfgimpl_parent != None:
|
||
raise MethodCallError("this method root_hide() shall not be"
|
||
"used with non-root Confit() object")
|
||
rootconfig = self._cfgimpl_get_toplevel()
|
||
rootconfig._cfgimpl_disabled = True
|
||
|
||
def cfgimpl_enable(self):
|
||
if self._cfgimpl_parent != None:
|
||
raise MethodCallError("this method root_hide() shall not be"
|
||
"used with non-root Confit() object")
|
||
rootconfig = self._cfgimpl_get_toplevel()
|
||
rootconfig._cfgimpl_disabled = False
|
||
# ____________________________________________________________
|
||
def __setattr__(self, name, value):
|
||
if '.' in name:
|
||
homeconfig, name = self._cfgimpl_get_home_by_path(name)
|
||
return setattr(homeconfig, name, value)
|
||
|
||
if name.startswith('_cfgimpl_'):
|
||
self.__dict__[name] = value
|
||
return
|
||
if self._cfgimpl_frozen and getattr(self, name) != value:
|
||
raise TypeError("trying to change a value in a frozen config"
|
||
": {0} {1}".format(name, value))
|
||
if type(getattr(self._cfgimpl_descr, name)) != SymLinkOption:
|
||
self._validate(name, getattr(self._cfgimpl_descr, name))
|
||
self.setoption(name, value, self._cfgimpl_owner)
|
||
|
||
def _validate(self, name, opt_or_descr):
|
||
if not type(opt_or_descr) == OptionDescription:
|
||
apply_requires(opt_or_descr, self)
|
||
# hidden options
|
||
if self._cfgimpl_toplevel._cfgimpl_hidden and \
|
||
(opt_or_descr._is_hidden() or self._cfgimpl_descr._is_hidden()):
|
||
raise HiddenOptionError("trying to access to a hidden option:"
|
||
" {0}".format(name))
|
||
# disabled options
|
||
if self._cfgimpl_toplevel._cfgimpl_disabled and \
|
||
(opt_or_descr._is_disabled() or self._cfgimpl_descr._is_disabled()):
|
||
raise DisabledOptionError("this option is disabled:"
|
||
" {0}".format(name))
|
||
# expert options
|
||
# XXX currently doesn't look at the group, is it really necessary ?
|
||
if self._cfgimpl_toplevel._cfgimpl_mode != 'normal':
|
||
if opt_or_descr.get_mode() != 'normal':
|
||
raise ModeOptionError("this option's mode is not normal:"
|
||
" {0}".format(name))
|
||
if type(opt_or_descr) == OptionDescription:
|
||
apply_requires(opt_or_descr, self)
|
||
|
||
def __getattr__(self, name):
|
||
# attribute access by passing a path,
|
||
# for instance getattr(self, "creole.general.family.adresse_ip_eth0")
|
||
if '.' in name:
|
||
homeconfig, name = self._cfgimpl_get_home_by_path(name)
|
||
return getattr(homeconfig, name)
|
||
opt_or_descr = getattr(self._cfgimpl_descr, name)
|
||
# symlink options
|
||
if type(opt_or_descr) == SymLinkOption:
|
||
return getattr(self, opt_or_descr.path)
|
||
self._validate(name, opt_or_descr)
|
||
# special attributes
|
||
if name.startswith('_cfgimpl_'):
|
||
# if it were in __dict__ it would have been found already
|
||
return self.__dict__[name]
|
||
raise AttributeError("%s object has no attribute %s" %
|
||
(self.__class__, name))
|
||
if name not in self._cfgimpl_values:
|
||
raise AttributeError("%s object has no attribute %s" %
|
||
(self.__class__, name))
|
||
if name in self._cfgimpl_value_owners:
|
||
owner = self._cfgimpl_value_owners[name]
|
||
# special owners
|
||
if owner in special_owners:
|
||
return special_owner_factory(name, owner,
|
||
default=opt_or_descr.getdefault(),
|
||
callback=opt_or_descr.getcallback(),
|
||
config=self)
|
||
# mandatory options
|
||
if not isinstance(opt_or_descr, OptionDescription):
|
||
homeconfig = self._cfgimpl_get_toplevel()
|
||
mandatory = homeconfig._cfgimpl_mandatory
|
||
if opt_or_descr.is_mandatory() and mandatory:
|
||
if self._cfgimpl_values[name] == None\
|
||
and opt_or_descr.getdefault() == None:
|
||
raise MandatoryError("option: {0} is mandatory "
|
||
"and shall have a value".format(name))
|
||
return self._cfgimpl_values[name]
|
||
|
||
def __dir__(self):
|
||
#from_type = dir(type(self))
|
||
from_dict = list(self.__dict__)
|
||
extras = list(self._cfgimpl_values)
|
||
return sorted(set(extras + from_dict))
|
||
|
||
def unwrap_from_name(self, name):
|
||
# didn't have to stoop so low: `self.get()` must be the proper method
|
||
# **and it is slow**: it recursively searches into the namespaces
|
||
paths = self.getpaths(allpaths=True)
|
||
opts = dict([(path, self.unwrap_from_path(path)) for path in paths])
|
||
all_paths = [p.split(".") for p in self.getpaths()]
|
||
for pth in all_paths:
|
||
if name in pth:
|
||
return opts[".".join(pth)]
|
||
raise NotFoundError("name: {0} not found".format(name))
|
||
|
||
def unwrap_from_path(self, path):
|
||
# didn't have to stoop so low, `geattr(self, path)` is much better
|
||
# **fast**: finds the option directly in the appropriate namespace
|
||
if '.' in path:
|
||
homeconfig, path = self._cfgimpl_get_home_by_path(path)
|
||
return getattr(homeconfig._cfgimpl_descr, path)
|
||
return getattr(self._cfgimpl_descr, path)
|
||
|
||
def __delattr__(self, name):
|
||
# if you use delattr you are responsible for all bad things happening
|
||
if name.startswith('_cfgimpl_'):
|
||
del self.__dict__[name]
|
||
return
|
||
self._cfgimpl_value_owners[name] = 'default'
|
||
opt = getattr(self._cfgimpl_descr, name)
|
||
if isinstance(opt, OptionDescription):
|
||
raise AttributeError("can't option subgroup")
|
||
self._cfgimpl_values[name] = getattr(opt, 'default', None)
|
||
|
||
def setoption(self, name, value, who=None):
|
||
if who == None:
|
||
who == self._cfgimpl_owner
|
||
child = getattr(self._cfgimpl_descr, name)
|
||
if type(child) != SymLinkOption:
|
||
if name not in self._cfgimpl_values:
|
||
raise AttributeError('unknown option %s' % (name,))
|
||
# special owners, a value with a owner *auto* cannot be changed
|
||
oldowner = self._cfgimpl_value_owners[child._name]
|
||
if oldowner == 'auto':
|
||
if who == 'auto':
|
||
raise ConflictConfigError('cannot override value to %s for '
|
||
'option %s' % (value, name))
|
||
if oldowner == who:
|
||
oldvalue = getattr(self, name)
|
||
if oldvalue == value: #or who in ("default",):
|
||
return
|
||
child.setoption(self, value, who)
|
||
# if the value owner is 'auto', set the option to hidden
|
||
if who == 'auto':
|
||
if not child._is_hidden():
|
||
child.hide()
|
||
self._cfgimpl_value_owners[name] = who
|
||
else:
|
||
homeconfig = self._cfgimpl_get_toplevel()
|
||
child.setoption(homeconfig, value, who)
|
||
|
||
def set(self, **kwargs):
|
||
all_paths = [p.split(".") for p in self.getpaths(allpaths=True)]
|
||
for key, value in kwargs.iteritems():
|
||
key_p = key.split('.')
|
||
candidates = [p for p in all_paths if p[-len(key_p):] == key_p]
|
||
if len(candidates) == 1:
|
||
name = '.'.join(candidates[0])
|
||
homeconfig, name = self._cfgimpl_get_home_by_path(name)
|
||
try:
|
||
getattr(homeconfig, name)
|
||
except MandatoryError:
|
||
pass
|
||
except Exception, e:
|
||
raise e # HiddenOptionError or DisabledOptionError
|
||
homeconfig.setoption(name, value, self._cfgimpl_owner)
|
||
elif len(candidates) > 1:
|
||
raise AmbigousOptionError(
|
||
'more than one option that ends with %s' % (key, ))
|
||
else:
|
||
raise NoMatchingOptionFound(
|
||
'there is no option that matches %s'
|
||
' or the option is hidden or disabled'% (key, ))
|
||
|
||
def get(self, name):
|
||
paths = self.getpaths(allpaths=True)
|
||
pathsvalues = []
|
||
for path in paths:
|
||
pathname = path.split('.')[-1]
|
||
if pathname == name:
|
||
try:
|
||
value = getattr(self, path)
|
||
return value
|
||
except Exception, e:
|
||
raise e
|
||
raise NotFoundError("option {0} not found in config".format(name))
|
||
|
||
def _cfgimpl_get_home_by_path(self, path):
|
||
"""returns tuple (config, name)"""
|
||
path = path.split('.')
|
||
|
||
for step in path[:-1]:
|
||
self = getattr(self, step)
|
||
return self, path[-1]
|
||
|
||
def _cfgimpl_get_toplevel(self):
|
||
while self._cfgimpl_parent is not None:
|
||
self = self._cfgimpl_parent
|
||
return self
|
||
|
||
def add_warning(self, warning):
|
||
self._cfgimpl_get_toplevel()._cfgimpl_warnings.append(warning)
|
||
|
||
def get_warnings(self):
|
||
return self._cfgimpl_get_toplevel()._cfgimpl_warnings
|
||
# ____________________________________________________________
|
||
# freeze and read-write statuses
|
||
def cfgimpl_freeze(self):
|
||
rootconfig = self._cfgimpl_get_toplevel()
|
||
rootconfig._cfgimpl_frozen = True
|
||
self._cfgimpl_frozen = True
|
||
|
||
def cfgimpl_unfreeze(self):
|
||
rootconfig = self._cfgimpl_get_toplevel()
|
||
rootconfig._cfgimpl_frozen = False
|
||
self._cfgimpl_frozen = False
|
||
|
||
def is_frozen(self):
|
||
# it should be the same value as self._cfgimpl_frozen...
|
||
rootconfig = self._cfgimpl_get_toplevel()
|
||
return rootconfig.__dict__['_cfgimpl_frozen']
|
||
|
||
def cfgimpl_read_only(self):
|
||
# hung up on freeze, hidden and disabled concepts
|
||
self.cfgimpl_freeze()
|
||
rootconfig = self._cfgimpl_get_toplevel()
|
||
rootconfig._cfgimpl_hidden = False
|
||
rootconfig._cfgimpl_disabled = True
|
||
rootconfig._cfgimpl_mandatory = True
|
||
|
||
def cfgimpl_set_mode(self, mode):
|
||
# normal or expert mode
|
||
rootconfig = self._cfgimpl_get_toplevel()
|
||
if mode not in modes:
|
||
raise ConfigError("mode {0} not available".format(mode))
|
||
rootconfig._cfgimpl_mode = mode
|
||
|
||
def cfgimpl_read_write(self):
|
||
# hung up on freeze, hidden and disabled concepts
|
||
self.cfgimpl_unfreeze()
|
||
rootconfig = self._cfgimpl_get_toplevel()
|
||
rootconfig._cfgimpl_hidden = True
|
||
rootconfig._cfgimpl_disabled = False
|
||
rootconfig._cfgimpl_mandatory = False
|
||
# ____________________________________________________________
|
||
def getkey(self):
|
||
return self._cfgimpl_descr.getkey(self)
|
||
|
||
def __hash__(self):
|
||
return hash(self.getkey())
|
||
|
||
def __eq__(self, other):
|
||
return self.getkey() == other.getkey()
|
||
|
||
def __ne__(self, other):
|
||
return not self == other
|
||
|
||
def __iter__(self):
|
||
# iteration only on Options (not OptionDescriptions)
|
||
for child in self._cfgimpl_descr._children:
|
||
if isinstance(child, Option):
|
||
try:
|
||
yield child._name, getattr(self, child._name)
|
||
except:
|
||
pass # hidden, disabled option group
|
||
|
||
def iter_groups(self, group_type=None):
|
||
"iteration on OptionDescriptions"
|
||
if group_type == None:
|
||
groups = group_types
|
||
else:
|
||
if group_type not in group_types:
|
||
raise TypeError("Unknown group_type: {0}".format(group_type))
|
||
groups = [group_type]
|
||
for child in self._cfgimpl_descr._children:
|
||
if isinstance(child, OptionDescription):
|
||
try:
|
||
if child.get_group_type() in groups:
|
||
yield child._name, getattr(self, child._name)
|
||
except:
|
||
pass # hidden, disabled option
|
||
|
||
def __str__(self, indent=""):
|
||
lines = []
|
||
children = [(child._name, child)
|
||
for child in self._cfgimpl_descr._children]
|
||
children.sort()
|
||
for name, child in children:
|
||
if self._cfgimpl_value_owners.get(name, None) == 'default':
|
||
continue
|
||
value = getattr(self, name)
|
||
if isinstance(value, Config):
|
||
substr = value.__str__(indent + " ")
|
||
else:
|
||
substr = "%s %s = %s" % (indent, name, value)
|
||
if substr:
|
||
lines.append(substr)
|
||
if indent and not lines:
|
||
return '' # hide subgroups with all default values
|
||
lines.insert(0, "%s[%s]" % (indent, self._cfgimpl_descr._name,))
|
||
return '\n'.join(lines)
|
||
|
||
def getpaths(self, include_groups=False, allpaths=False):
|
||
"""returns a list of all paths in self, recursively, taking care of
|
||
the context (hidden/disabled)
|
||
"""
|
||
paths = []
|
||
for path in self._cfgimpl_descr.getpaths(include_groups=include_groups):
|
||
try:
|
||
value = getattr(self, path)
|
||
except Exception, e:
|
||
if not allpaths:
|
||
pass # hidden or disabled option
|
||
else:
|
||
paths.append(path) # hidden or disabled option added
|
||
else:
|
||
paths.append(path)
|
||
return paths
|
||
|
||
def make_dict(config, flatten=False):
|
||
paths = config.getpaths()
|
||
pathsvalues = []
|
||
for path in paths:
|
||
if flatten:
|
||
pathname = path.split('.')[-1]
|
||
else:
|
||
pathname = path
|
||
try:
|
||
value = getattr(config, path)
|
||
pathsvalues.append((pathname, value))
|
||
except:
|
||
pass # this just a hidden or disabled option
|
||
options = dict(pathsvalues)
|
||
return options
|
||
# ____________________________________________________________
|
||
|