author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Thu, 22 Sep 2011 19:13:58 +0200 | |
branch | stable |
changeset 7838 | ea1360938033 |
parent 7471 | bf9443f8725f |
child 8493 | 25da1e5c7c50 |
permissions | -rw-r--r-- |
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# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved. |
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr |
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# |
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# This file is part of CubicWeb. |
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# |
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# CubicWeb is free software: you can redistribute it and/or modify it under the |
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# terms of the GNU Lesser General Public License as published by the Free |
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# Software Foundation, either version 2.1 of the License, or (at your option) |
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# any later version. |
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# |
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT |
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more |
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# details. |
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# |
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# You should have received a copy of the GNU Lesser General Public License along |
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# with CubicWeb. If not, see <http://www.gnu.org/licenses/>. |
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"""helper classes to handle server-side edition of entities""" |
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from __future__ import with_statement |
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__docformat__ = "restructuredtext en" |
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from copy import copy |
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from yams import ValidationError |
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_MARKER = object() |
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class dict_protocol_catcher(object): |
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def __init__(self, entity): |
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self.__entity = entity |
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def __getitem__(self, attr): |
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return self.__entity.cw_edited[attr] |
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def __setitem__(self, attr, value): |
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self.__entity.cw_edited[attr] = value |
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def __getattr__(self, attr): |
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return getattr(self.__entity, attr) |
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class EditedEntity(dict): |
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"""encapsulate entities attributes being written by an RQL query""" |
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def __init__(self, entity, **kwargs): |
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dict.__init__(self, **kwargs) |
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self.entity = entity |
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self.skip_security = set() |
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self.querier_pending_relations = {} |
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self.saved = False |
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def __hash__(self): |
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# dict|set keyable |
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return hash(id(self)) |
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def __cmp__(self, other): |
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# we don't want comparison by value inherited from dict |
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return cmp(id(self), id(other)) |
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def __setitem__(self, attr, value): |
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assert attr != 'eid' |
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# don't add attribute into skip_security if already in edited |
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# attributes, else we may accidentaly skip a desired security check |
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if attr not in self: |
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self.skip_security.add(attr) |
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self.edited_attribute(attr, value) |
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def __delitem__(self, attr): |
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assert not self.saved, 'too late to modify edited attributes' |
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super(EditedEntity, self).__delitem__(attr) |
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self.entity.cw_attr_cache.pop(attr, None) |
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def __copy__(self): |
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# default copy protocol fails in EditedEntity.__setitem__ because |
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# copied entity has no skip_security attribute at this point |
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return EditedEntity(self.entity, **self) |
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def pop(self, attr, *args): |
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# don't update skip_security by design (think to storage api) |
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assert not self.saved, 'too late to modify edited attributes' |
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value = super(EditedEntity, self).pop(attr, *args) |
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self.entity.cw_attr_cache.pop(attr, *args) |
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return value |
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def setdefault(self, attr, default): |
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assert attr != 'eid' |
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# don't add attribute into skip_security if already in edited |
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# attributes, else we may accidentaly skip a desired security check |
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if attr not in self: |
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self[attr] = default |
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return self[attr] |
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def update(self, values, skipsec=True): |
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if skipsec: |
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setitem = self.__setitem__ |
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else: |
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setitem = self.edited_attribute |
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for attr, value in values.iteritems(): |
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setitem(attr, value) |
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def edited_attribute(self, attr, value): |
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"""attribute being edited by a rql query: should'nt be added to |
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skip_security |
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""" |
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assert not self.saved, 'too late to modify edited attributes' |
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super(EditedEntity, self).__setitem__(attr, value) |
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self.entity.cw_attr_cache[attr] = value |
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def oldnewvalue(self, attr): |
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"""returns the couple (old attr value, new attr value) |
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NOTE: will only work in a before_update_entity hook |
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""" |
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assert not self.saved, 'too late to get the old value' |
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# get new value and remove from local dict to force a db query to |
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114 |
# fetch old value |
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newvalue = self.entity.cw_attr_cache.pop(attr, _MARKER) |
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oldvalue = getattr(self.entity, attr) |
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117 |
if newvalue is not _MARKER: |
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self.entity.cw_attr_cache[attr] = newvalue |
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119 |
else: |
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120 |
newvalue = oldvalue |
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121 |
return oldvalue, newvalue |
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122 |
|
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123 |
def set_defaults(self): |
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124 |
"""set default values according to the schema""" |
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for attr, value in self.entity.e_schema.defaults(): |
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126 |
if not attr in self: |
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127 |
self[str(attr)] = value |
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128 |
|
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129 |
def check(self, creation=False): |
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130 |
"""check the entity edition against its schema. Only final relation |
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131 |
are checked here, constraint on actual relations are checked in hooks |
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132 |
""" |
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133 |
entity = self.entity |
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134 |
if creation: |
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# on creations, we want to check all relations, especially |
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136 |
# required attributes |
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relations = [rschema for rschema in entity.e_schema.subject_relations() |
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if rschema.final and rschema.type != 'eid'] |
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139 |
else: |
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relations = [entity._cw.vreg.schema.rschema(rtype) |
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141 |
for rtype in self] |
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142 |
try: |
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entity.e_schema.check(dict_protocol_catcher(entity), |
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144 |
creation=creation, _=entity._cw._, |
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145 |
relations=relations) |
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146 |
except ValidationError, ex: |
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147 |
ex.entity = self.entity |
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148 |
raise |
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149 |
|
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150 |
def clone(self): |
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thecopy = EditedEntity(copy(self.entity)) |
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thecopy.entity.cw_attr_cache = copy(self.entity.cw_attr_cache) |
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thecopy.entity._cw_related_cache = {} |
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154 |
thecopy.update(self, skipsec=False) |
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155 |
return thecopy |