tiramisu/tiramisu/value.py

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# -*- coding: utf-8 -*-
"takes care of the option's values and multi values"
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# Copyright (C) 2013 Team tiramisu (see AUTHORS for all contributors)
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#
# 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
#
# ____________________________________________________________
from time import time
from copy import copy
import sys
import weakref
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from tiramisu.error import ConfigError, SlaveError
from tiramisu.setting import owners, multitypes, expires_time, undefined
from tiramisu.autolib import carry_out_calculation
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from tiramisu.i18n import _
from tiramisu.option import SymLinkOption
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class Values(object):
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"""The `Config`'s root is indeed in charge of the `Option()`'s values,
but the values are physicaly located here, in `Values`, wich is also
responsible of a caching utility.
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"""
__slots__ = ('context', '_p_', '__weakref__')
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def __init__(self, context, storage):
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"""
Initializes the values's dict.
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:param context: the context is the home config's values
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"""
self.context = weakref.ref(context)
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# the storage type is dictionary or sqlite3
self._p_ = storage
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def _getcontext(self):
"""context could be None, we need to test it
context is None only if all reference to `Config` object is deleted
(for example we delete a `Config` and we manipulate a reference to
old `SubConfig`, `Values`, `Multi` or `Settings`)
"""
context = self.context()
if context is None:
raise ConfigError(_('the context does not exist anymore'))
return context
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def _getdefault(self, opt):
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"""
actually retrieves the default value
:param opt: the `option.Option()` object
"""
meta = self._getcontext().cfgimpl_get_meta()
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if meta is not None:
value = meta.cfgimpl_get_values()[opt]
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else:
value = opt.impl_getdefault()
if opt.impl_is_multi():
return copy(value)
else:
return value
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def _getvalue(self, opt, path, validate=True):
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"""actually retrieves the value
:param opt: the `option.Option()` object
:returns: the option's value (or the default value if not set)
"""
if not self._p_.hasvalue(path):
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# if there is no value
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value = self._getdefault(opt)
if opt.impl_is_multi():
value = Multi(value, self.context, opt, path, validate)
else:
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# if there is a value
value = self._p_.getvalue(path)
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if opt.impl_is_multi() and not isinstance(value, Multi):
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# load value so don't need to validate if is not a Multi
value = Multi(value, self.context, opt, path, validate=False)
return value
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def get_modified_values(self):
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return self._p_.get_modified_values()
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def __contains__(self, opt):
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"""
implements the 'in' keyword syntax in order provide a pythonic way
to kow if an option have a value
:param opt: the `option.Option()` object
"""
path = self._get_opt_path(opt)
return self._contains(path)
def _contains(self, path):
return self._p_.hasvalue(path)
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def __delitem__(self, opt):
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"""overrides the builtins `del()` instructions"""
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self.reset(opt)
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def reset(self, opt, path=None):
if path is None:
path = self._get_opt_path(opt)
if self._p_.hasvalue(path):
context = self._getcontext()
setting = context.cfgimpl_get_settings()
opt.impl_validate(opt.impl_getdefault(),
context, 'validator' in setting)
context.cfgimpl_reset_cache()
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if (opt.impl_is_multi() and
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opt.impl_get_multitype() == multitypes.master):
for slave in opt.impl_get_master_slaves():
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self.reset(slave)
self._p_.resetvalue(path)
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def _isempty(self, opt, value):
"convenience method to know if an option is empty"
empty = opt._empty
if (not opt.impl_is_multi() and (value is None or value == empty)) or \
(opt.impl_is_multi() and (value == [] or
None in value or empty in value)):
return True
return False
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def _getcallback_value(self, opt, index=None, max_len=None):
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"""
retrieves a value for the options that have a callback
:param opt: the `option.Option()` object
:param index: if an option is multi, only calculates the nth value
:type index: int
:returns: a calculated value
"""
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callback, callback_params = opt._callback
if callback_params is None:
callback_params = {}
return carry_out_calculation(opt, config=self._getcontext(),
callback=callback,
callback_params=callback_params,
index=index, max_len=max_len)
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def __getitem__(self, opt):
"enables us to use the pythonic dictionary-like access to values"
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return self.getitem(opt)
def getitem(self, opt, path=None, validate=True, force_permissive=False,
force_properties=None, validate_properties=True):
if path is None:
path = self._get_opt_path(opt)
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ntime = None
setting = self._getcontext().cfgimpl_get_settings()
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if 'cache' in setting and self._p_.hascache(path):
if 'expire' in setting:
ntime = int(time())
is_cached, value = self._p_.getcache(path, ntime)
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if is_cached:
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if opt.impl_is_multi() and not isinstance(value, Multi):
#load value so don't need to validate if is not a Multi
value = Multi(value, self.context, opt, path, validate=False)
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return value
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val = self._getitem(opt, path, validate, force_permissive,
force_properties, validate_properties)
if 'cache' in setting and validate and validate_properties and \
force_permissive is False and force_properties is None:
if 'expire' in setting:
if ntime is None:
ntime = int(time())
ntime = ntime + expires_time
self._p_.setcache(path, val, ntime)
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return val
def _getitem(self, opt, path, validate, force_permissive, force_properties,
validate_properties):
# options with callbacks
context = self._getcontext()
setting = context.cfgimpl_get_settings()
is_frozen = 'frozen' in setting[opt]
# For calculating properties, we need value (ie for mandatory value).
# If value is calculating with a PropertiesOptionError's option
# _getcallback_value raise a ConfigError.
# We can not raise ConfigError if this option should raise
# PropertiesOptionError too. So we get config_error and raise
# ConfigError if properties did not raise.
config_error = None
force_permissives = None
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# if value is callback and is not set
# or frozen with force_default_on_freeze
if opt.impl_has_callback() and (
self._is_default_owner(path) or
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(is_frozen and 'force_default_on_freeze' in setting[opt])):
lenmaster = None
no_value_slave = False
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if (opt.impl_is_multi() and
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opt.impl_get_multitype() == multitypes.slave):
masterp = self._get_opt_path(opt.impl_get_master_slaves())
mastervalue = getattr(context, masterp)
lenmaster = len(mastervalue)
if lenmaster == 0:
value = []
no_value_slave = True
if not no_value_slave:
try:
value = self._getcallback_value(opt, max_len=lenmaster)
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except ConfigError as err:
# cannot assign config_err directly in python 3.3
config_error = err
value = None
# should not raise PropertiesOptionError if option is
# mandatory
force_permissives = set(['mandatory'])
else:
if (opt.impl_is_multi() and
opt.impl_get_multitype() == multitypes.slave):
if not isinstance(value, list):
value = [value for i in range(lenmaster)]
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if config_error is None:
if opt.impl_is_multi():
value = Multi(value, self.context, opt, path, validate)
# suppress value if already set
self.reset(opt, path)
# frozen and force default
elif is_frozen and 'force_default_on_freeze' in setting[opt]:
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value = self._getdefault(opt)
if opt.impl_is_multi():
value = Multi(value, self.context, opt, path, validate)
else:
value = self._getvalue(opt, path, validate)
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if config_error is None and validate:
opt.impl_validate(value, context, 'validator' in setting)
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if config_error is None and self._is_default_owner(path) and \
'force_store_value' in setting[opt]:
self.setitem(opt, value, path, is_write=False)
if validate_properties:
setting.validate_properties(opt, False, False, value=value, path=path,
force_permissive=force_permissive,
force_properties=force_properties,
force_permissives=force_permissives)
if config_error is not None:
raise config_error
return value
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def __setitem__(self, opt, value):
raise ValueError('you should only set value with config')
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def setitem(self, opt, value, path, force_permissive=False,
is_write=True):
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# is_write is, for example, used with "force_store_value"
# user didn't change value, so not write
# valid opt
context = self._getcontext()
opt.impl_validate(value, context,
'validator' in context.cfgimpl_get_settings())
if opt.impl_is_multi() and not isinstance(value, Multi):
value = Multi(value, self.context, opt, path, setitem=True)
self._setvalue(opt, path, value, force_permissive=force_permissive,
is_write=is_write)
def _setvalue(self, opt, path, value, force_permissive=False,
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force_properties=None,
is_write=True, validate_properties=True):
context = self._getcontext()
context.cfgimpl_reset_cache()
if validate_properties:
setting = context.cfgimpl_get_settings()
setting.validate_properties(opt, False, is_write,
value=value, path=path,
force_permissive=force_permissive,
force_properties=force_properties)
owner = context.cfgimpl_get_settings().getowner()
self._p_.setvalue(path, value, owner)
def getowner(self, opt):
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"""
retrieves the option's owner
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:param opt: the `option.Option` object
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:returns: a `setting.owners.Owner` object
"""
if isinstance(opt, SymLinkOption):
opt = opt._opt
path = self._get_opt_path(opt)
return self._getowner(path)
def _getowner(self, path):
owner = self._p_.getowner(path, owners.default)
meta = self._getcontext().cfgimpl_get_meta()
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if owner is owners.default and meta is not None:
owner = meta.cfgimpl_get_values()._getowner(path)
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return owner
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def setowner(self, opt, owner):
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"""
sets a owner to an option
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:param opt: the `option.Option` object
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:param owner: a valid owner, that is a `setting.owners.Owner` object
"""
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if not isinstance(owner, owners.Owner):
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raise TypeError(_("invalid generic owner {0}").format(str(owner)))
path = self._get_opt_path(opt)
self._setowner(path, owner)
def _setowner(self, path, owner):
if self._getowner(path) == owners.default:
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raise ConfigError(_('no value for {0} cannot change owner to {1}'
'').format(path, owner))
self._p_.setowner(path, owner)
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def is_default_owner(self, opt):
"""
:param config: *must* be only the **parent** config
(not the toplevel config)
:return: boolean
"""
path = self._get_opt_path(opt)
return self._is_default_owner(path)
def _is_default_owner(self, path):
return self._getowner(path) == owners.default
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def reset_cache(self, only_expired):
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"""
clears the cache if necessary
"""
if only_expired:
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self._p_.reset_expired_cache(int(time()))
else:
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self._p_.reset_all_cache()
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def _get_opt_path(self, opt):
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"""
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retrieve the option's path in the config
:param opt: the `option.Option` object
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:returns: a string with points like "gc.dummy.my_option"
"""
return self._getcontext().cfgimpl_get_description().impl_get_path_by_opt(opt)
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# information
def set_information(self, key, value):
"""updates the information's attribute
:param key: information's key (ex: "help", "doc"
:param value: information's value (ex: "the help string")
"""
self._p_.set_information(key, value)
def get_information(self, key, default=None):
"""retrieves one information's item
:param key: the item string (ex: "help")
"""
try:
return self._p_.get_information(key)
except ValueError:
if default is not None:
return default
else:
raise ValueError(_("information's item"
" not found: {0}").format(key))
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def __getstate__(self):
return {'_p_': self._p_}
def _impl_setstate(self, storage):
self._p_._storage = storage
def __setstate__(self, states):
self._p_ = states['_p_']
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# ____________________________________________________________
# multi types
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class Multi(list):
"""multi options values container
that support item notation for the values of multi options"""
__slots__ = ('opt', 'path', 'context')
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def __init__(self, value, context, opt, path, validate=True,
setitem=False):
"""
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:param value: the Multi wraps a list value
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:param context: the home config that has the values
:param opt: the option object that have this Multi value
:param setitem: only if set a value
"""
self.opt = opt
self.path = path
if not isinstance(context, weakref.ReferenceType):
raise ValueError('context must be a Weakref')
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self.context = context
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if not isinstance(value, list):
value = [value]
if validate and self.opt.impl_get_multitype() == multitypes.slave:
value = self._valid_slave(value, setitem)
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elif validate and self.opt.impl_get_multitype() == multitypes.master:
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self._valid_master(value)
super(Multi, self).__init__(value)
def _getcontext(self):
"""context could be None, we need to test it
context is None only if all reference to `Config` object is deleted
(for example we delete a `Config` and we manipulate a reference to
old `SubConfig`, `Values`, `Multi` or `Settings`)
"""
context = self.context()
if context is None:
raise ConfigError(_('the context does not exist anymore'))
return context
def _valid_slave(self, value, setitem):
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#if slave, had values until master's one
context = self._getcontext()
values = context.cfgimpl_get_values()
masterp = context.cfgimpl_get_description().impl_get_path_by_opt(
self.opt.impl_get_master_slaves())
mastervalue = getattr(context, masterp)
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masterlen = len(mastervalue)
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valuelen = len(value)
is_default_owner = not values._is_default_owner(self.path) or setitem
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if valuelen > masterlen or (valuelen < masterlen and
is_default_owner):
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raise SlaveError(_("invalid len for the slave: {0}"
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" which has {1} as master").format(
self.opt._name, masterp))
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elif valuelen < masterlen:
for num in range(0, masterlen - valuelen):
if self.opt.impl_has_callback():
# if callback add a value, but this value will not change
# anymore automaticly (because this value has owner)
index = value.__len__()
value.append(values._getcallback_value(self.opt,
index=index))
else:
value.append(self.opt.impl_getdefault_multi())
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#else: same len so do nothing
return value
def _valid_master(self, value):
masterlen = len(value)
values = self._getcontext().cfgimpl_get_values()
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for slave in self.opt._master_slaves:
path = values._get_opt_path(slave)
if not values._is_default_owner(path):
value_slave = values._getvalue(slave, path)
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if len(value_slave) > masterlen:
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raise SlaveError(_("invalid len for the master: {0}"
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" which has {1} as slave with"
" greater len").format(
self.opt._name, slave._name))
elif len(value_slave) < masterlen:
for num in range(0, masterlen - len(value_slave)):
if slave.impl_has_callback():
# if callback add a value, but this value will not
# change anymore automaticly (because this value
# has owner)
index = value_slave.__len__()
value_slave.append(
values._getcallback_value(slave, index=index),
force=True)
else:
value_slave.append(undefined, force=True)
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def __setitem__(self, index, value):
self._validate(value, index)
#assume not checking mandatory property
super(Multi, self).__setitem__(index, value)
self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
def append(self, value=undefined, force=False):
"""the list value can be updated (appened)
only if the option is a master
"""
context = self._getcontext()
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if not force:
if self.opt.impl_get_multitype() == multitypes.slave:
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raise SlaveError(_("cannot append a value on a multi option {0}"
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" which is a slave").format(self.opt._name))
elif self.opt.impl_get_multitype() == multitypes.master:
values = context.cfgimpl_get_values()
if value is undefined and self.opt.impl_has_callback():
value = values._getcallback_value(self.opt)
#Force None il return a list
if isinstance(value, list):
value = None
index = self.__len__()
if value is undefined:
value = self.opt.impl_getdefault_multi()
self._validate(value, index)
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super(Multi, self).append(value)
context.cfgimpl_get_values()._setvalue(self.opt, self.path,
self,
validate_properties=not force)
if not force and self.opt.impl_get_multitype() == multitypes.master:
for slave in self.opt.impl_get_master_slaves():
path = values._get_opt_path(slave)
if not values._is_default_owner(path):
if slave.impl_has_callback():
dvalue = values._getcallback_value(slave, index=index)
else:
dvalue = slave.impl_getdefault_multi()
old_value = values.getitem(slave, path,
validate_properties=False)
if len(old_value) < self.__len__():
values.getitem(slave, path,
validate_properties=False).append(
dvalue, force=True)
else:
values.getitem(slave, path,
validate_properties=False)[
index] = dvalue
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def sort(self, cmp=None, key=None, reverse=False):
if self.opt.impl_get_multitype() in [multitypes.slave,
multitypes.master]:
raise SlaveError(_("cannot sort multi option {0} if master or slave"
"").format(self.opt._name))
if sys.version_info[0] >= 3:
if cmp is not None:
raise ValueError(_('cmp is not permitted in python v3 or greater'))
super(Multi, self).sort(key=key, reverse=reverse)
else:
super(Multi, self).sort(cmp=cmp, key=key, reverse=reverse)
self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
def reverse(self):
if self.opt.impl_get_multitype() in [multitypes.slave,
multitypes.master]:
raise SlaveError(_("cannot reverse multi option {0} if master or "
"slave").format(self.opt._name))
super(Multi, self).reverse()
self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
def insert(self, index, obj):
if self.opt.impl_get_multitype() in [multitypes.slave,
multitypes.master]:
raise SlaveError(_("cannot insert multi option {0} if master or "
"slave").format(self.opt._name))
super(Multi, self).insert(index, obj)
self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
def extend(self, iterable):
if self.opt.impl_get_multitype() in [multitypes.slave,
multitypes.master]:
raise SlaveError(_("cannot extend multi option {0} if master or "
"slave").format(self.opt._name))
super(Multi, self).extend(iterable)
self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
def _validate(self, value, force_index):
if value is not None:
try:
self.opt.impl_validate(value, context=self._getcontext(),
force_index=force_index)
except ValueError as err:
raise ValueError(_("invalid value {0} "
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"for option {1}: {2}"
"").format(str(value),
self.opt._name, err))
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def pop(self, index, force=False):
"""the list value can be updated (poped)
only if the option is a master
:param index: remove item a index
:type index: int
:param force: force pop item (withoud check master/slave)
:type force: boolean
:returns: item at index
"""
context = self._getcontext()
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if not force:
if self.opt.impl_get_multitype() == multitypes.slave:
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raise SlaveError(_("cannot pop a value on a multi option {0}"
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" which is a slave").format(self.opt._name))
elif self.opt.impl_get_multitype() == multitypes.master:
for slave in self.opt.impl_get_master_slaves():
values = context.cfgimpl_get_values()
if not values.is_default_owner(slave):
#get multi without valid properties
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values.getitem(slave,
validate_properties=False
).pop(index, force=True)
#set value without valid properties
ret = super(Multi, self).pop(index)
context.cfgimpl_get_values()._setvalue(self.opt, self.path, self, validate_properties=not force)
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return ret