author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Thu, 17 Jun 2010 15:15:52 +0200 | |
changeset 5774 | 0d792bceb25d |
parent 5538 | 752bc67064f2 |
child 5877 | 0c7b7b76a84f |
permissions | -rw-r--r-- |
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# copyright 2003-2010 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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"""Core hooks: check for data integrity according to the instance'schema |
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validity |
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""" |
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__docformat__ = "restructuredtext en" |
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from threading import Lock |
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from yams.schema import role_name |
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from cubicweb import ValidationError |
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from cubicweb.schema import RQLConstraint, RQLUniqueConstraint |
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from cubicweb.selectors import implements |
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from cubicweb.uilib import soup2xhtml |
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from cubicweb.server import hook |
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from cubicweb.server.hook import set_operation |
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# special relations that don't have to be checked for integrity, usually |
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# because they are handled internally by hooks (so we trust ourselves) |
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DONT_CHECK_RTYPES_ON_ADD = set(('owned_by', 'created_by', |
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'is', 'is_instance_of', |
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'wf_info_for', 'from_state', 'to_state')) |
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DONT_CHECK_RTYPES_ON_DEL = set(('is', 'is_instance_of', |
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'wf_info_for', 'from_state', 'to_state')) |
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_UNIQUE_CONSTRAINTS_LOCK = Lock() |
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_UNIQUE_CONSTRAINTS_HOLDER = None |
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def _acquire_unique_cstr_lock(session): |
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"""acquire the _UNIQUE_CONSTRAINTS_LOCK for the session. |
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This lock used to avoid potential integrity pb when checking |
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RQLUniqueConstraint in two different transactions, as explained in |
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http://intranet.logilab.fr/jpl/ticket/36564 |
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""" |
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if 'uniquecstrholder' in session.transaction_data: |
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return |
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_UNIQUE_CONSTRAINTS_LOCK.acquire() |
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session.transaction_data['uniquecstrholder'] = True |
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# register operation responsible to release the lock on commit/rollback |
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_ReleaseUniqueConstraintsOperation(session) |
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def _release_unique_cstr_lock(session): |
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if 'uniquecstrholder' in session.transaction_data: |
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del session.transaction_data['uniquecstrholder'] |
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_UNIQUE_CONSTRAINTS_LOCK.release() |
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class _ReleaseUniqueConstraintsOperation(hook.Operation): |
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def commit_event(self): |
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pass |
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def postcommit_event(self): |
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_release_unique_cstr_lock(self.session) |
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def rollback_event(self): |
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_release_unique_cstr_lock(self.session) |
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class _CheckRequiredRelationOperation(hook.LateOperation): |
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"""checking relation cardinality has to be done after commit in |
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case the relation is being replaced |
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""" |
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role = key = base_rql = None |
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def precommit_event(self): |
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session =self.session |
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pendingeids = session.transaction_data.get('pendingeids', ()) |
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pendingrtypes = session.transaction_data.get('pendingrtypes', ()) |
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# poping key is not optional: if further operation trigger new deletion |
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# of relation, we'll need a new operation |
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for eid, rtype in session.transaction_data.pop(self.key): |
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# recheck pending eids / relation types |
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if eid in pendingeids: |
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continue |
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if rtype in pendingrtypes: |
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continue |
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if not session.execute(self.base_rql % rtype, {'x': eid}): |
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etype = session.describe(eid)[0] |
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_ = session._ |
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msg = _('at least one relation %(rtype)s is required on ' |
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'%(etype)s (%(eid)s)') |
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98 |
msg %= {'rtype': _(rtype), 'etype': _(etype), 'eid': eid} |
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99 |
raise ValidationError(eid, {role_name(rtype, self.role): msg}) |
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100 |
|
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101 |
|
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class _CheckSRelationOp(_CheckRequiredRelationOperation): |
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"""check required subject relation""" |
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role = 'subject' |
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105 |
key = '_cwisrel' |
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106 |
base_rql = 'Any O WHERE S eid %%(x)s, S %s O' |
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107 |
|
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class _CheckORelationOp(_CheckRequiredRelationOperation): |
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"""check required object relation""" |
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role = 'object' |
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key = '_cwiorel' |
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base_rql = 'Any S WHERE O eid %%(x)s, S %s O' |
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113 |
|
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114 |
|
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115 |
class IntegrityHook(hook.Hook): |
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__abstract__ = True |
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category = 'integrity' |
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118 |
|
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119 |
|
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class CheckCardinalityHook(IntegrityHook): |
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"""check cardinalities are satisfied""" |
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__regid__ = 'checkcard' |
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events = ('after_add_entity', 'before_delete_relation') |
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124 |
|
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125 |
def __call__(self): |
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getattr(self, self.event)() |
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127 |
|
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128 |
def after_add_entity(self): |
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eid = self.entity.eid |
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eschema = self.entity.e_schema |
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131 |
for rschema, targetschemas, role in eschema.relation_definitions(): |
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132 |
# skip automatically handled relations |
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133 |
if rschema.type in DONT_CHECK_RTYPES_ON_ADD: |
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134 |
continue |
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rdef = rschema.role_rdef(eschema, targetschemas[0], role) |
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136 |
if rdef.role_cardinality(role) in '1+': |
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137 |
if role == 'subject': |
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138 |
set_operation(self._cw, '_cwisrel', (eid, rschema.type), |
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139 |
_CheckSRelationOp, list) |
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140 |
else: |
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set_operation(self._cw, '_cwiorel', (eid, rschema.type), |
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142 |
_CheckORelationOp, list) |
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143 |
|
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144 |
def before_delete_relation(self): |
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rtype = self.rtype |
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146 |
if rtype in DONT_CHECK_RTYPES_ON_DEL: |
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147 |
return |
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148 |
session = self._cw |
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149 |
eidfrom, eidto = self.eidfrom, self.eidto |
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150 |
pendingrdefs = session.transaction_data.get('pendingrdefs', ()) |
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151 |
if (session.describe(eidfrom)[0], rtype, session.describe(eidto)[0]) in pendingrdefs: |
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152 |
return |
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card = session.schema_rproperty(rtype, eidfrom, eidto, 'cardinality') |
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154 |
if card[0] in '1+' and not session.deleted_in_transaction(eidfrom): |
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155 |
set_operation(self._cw, '_cwisrel', (eidfrom, rtype), |
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156 |
_CheckSRelationOp, list) |
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157 |
if card[1] in '1+' and not session.deleted_in_transaction(eidto): |
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158 |
set_operation(self._cw, '_cwiorel', (eidto, rtype), |
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159 |
_CheckORelationOp, list) |
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160 |
|
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161 |
|
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162 |
class _CheckConstraintsOp(hook.LateOperation): |
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163 |
""" check a new relation satisfy its constraints """ |
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164 |
|
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165 |
def precommit_event(self): |
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166 |
session = self.session |
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167 |
for values in session.transaction_data.pop('check_constraints_op'): |
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168 |
eidfrom, rtype, eidto, constraints = values |
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169 |
# first check related entities have not been deleted in the same |
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170 |
# transaction |
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171 |
if session.deleted_in_transaction(eidfrom): |
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172 |
return |
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173 |
if session.deleted_in_transaction(eidto): |
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174 |
return |
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175 |
for constraint in constraints: |
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176 |
# XXX |
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177 |
# * lock RQLConstraint as well? |
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178 |
# * use a constraint id to use per constraint lock and avoid |
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179 |
# unnecessary commit serialization ? |
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180 |
if isinstance(constraint, RQLUniqueConstraint): |
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181 |
_acquire_unique_cstr_lock(session) |
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182 |
try: |
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183 |
constraint.repo_check(session, eidfrom, rtype, eidto) |
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184 |
except NotImplementedError: |
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185 |
self.critical('can\'t check constraint %s, not supported', |
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186 |
constraint) |
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187 |
|
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188 |
def commit_event(self): |
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189 |
pass |
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190 |
|
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191 |
|
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192 |
class CheckConstraintHook(IntegrityHook): |
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193 |
"""check the relation satisfy its constraints |
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194 |
|
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195 |
this is delayed to a precommit time operation since other relation which |
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196 |
will make constraint satisfied (or unsatisfied) may be added later. |
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""" |
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__regid__ = 'checkconstraint' |
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199 |
events = ('after_add_relation',) |
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200 |
|
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201 |
def __call__(self): |
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# XXX get only RQL[Unique]Constraints? |
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constraints = self._cw.schema_rproperty(self.rtype, self.eidfrom, self.eidto, |
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'constraints') |
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if constraints: |
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206 |
hook.set_operation(self._cw, 'check_constraints_op', |
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207 |
(self.eidfrom, self.rtype, self.eidto, tuple(constraints)), |
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208 |
_CheckConstraintsOp, list) |
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209 |
|
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211 |
class CheckAttributeConstraintHook(IntegrityHook): |
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212 |
"""check the attribute relation satisfy its constraints |
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213 |
|
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214 |
this is delayed to a precommit time operation since other relation which |
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215 |
will make constraint satisfied (or unsatisfied) may be added later. |
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216 |
""" |
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217 |
__regid__ = 'checkattrconstraint' |
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218 |
events = ('after_add_entity', 'after_update_entity') |
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219 |
|
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220 |
def __call__(self): |
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221 |
eschema = self.entity.e_schema |
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222 |
for attr in self.entity.edited_attributes: |
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223 |
if eschema.subjrels[attr].final: |
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constraints = [c for c in eschema.rdef(attr).constraints |
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225 |
if isinstance(c, (RQLUniqueConstraint, RQLConstraint))] |
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226 |
if constraints: |
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227 |
hook.set_operation(self._cw, 'check_constraints_op', |
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228 |
(self.entity.eid, attr, None, tuple(constraints)), |
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229 |
_CheckConstraintsOp, list) |
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230 |
|
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231 |
|
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232 |
class CheckUniqueHook(IntegrityHook): |
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233 |
__regid__ = 'checkunique' |
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234 |
events = ('before_add_entity', 'before_update_entity') |
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235 |
|
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236 |
def __call__(self): |
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entity = self.entity |
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238 |
eschema = entity.e_schema |
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239 |
for attr in entity.edited_attributes: |
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240 |
if eschema.subjrels[attr].final and eschema.has_unique_values(attr): |
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241 |
val = entity[attr] |
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242 |
if val is None: |
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243 |
continue |
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244 |
rql = '%s X WHERE X %s %%(val)s' % (entity.e_schema, attr) |
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rset = self._cw.execute(rql, {'val': val}) |
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246 |
if rset and rset[0][0] != entity.eid: |
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msg = self._cw._('the value "%s" is already used, use another one') |
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248 |
qname = role_name(attr, 'subject') |
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249 |
raise ValidationError(entity.eid, {qname: msg % val}) |
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250 |
|
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251 |
|
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252 |
class DontRemoveOwnersGroupHook(IntegrityHook): |
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"""delete the composed of a composite relation when this relation is deleted |
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254 |
""" |
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255 |
__regid__ = 'checkownersgroup' |
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256 |
__select__ = IntegrityHook.__select__ & implements('CWGroup') |
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257 |
events = ('before_delete_entity', 'before_update_entity') |
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258 |
|
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259 |
def __call__(self): |
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if self.event == 'before_delete_entity' and self.entity.name == 'owners': |
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261 |
msg = self._cw._('can\'t be deleted') |
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262 |
raise ValidationError(self.entity.eid, {None: msg}) |
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263 |
elif self.event == 'before_update_entity' and \ |
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264 |
'name' in self.entity.edited_attributes: |
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265 |
newname = self.entity.pop('name') |
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266 |
oldname = self.entity.name |
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267 |
if oldname == 'owners' and newname != oldname: |
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268 |
qname = role_name('name', 'subject') |
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269 |
msg = self._cw._('can\'t be changed') |
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270 |
raise ValidationError(self.entity.eid, {qname: msg}) |
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self.entity['name'] = newname |
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272 |
|
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273 |
|
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274 |
class TidyHtmlFields(IntegrityHook): |
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275 |
"""tidy HTML in rich text strings""" |
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276 |
__regid__ = 'htmltidy' |
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277 |
events = ('before_add_entity', 'before_update_entity') |
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278 |
|
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279 |
def __call__(self): |
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entity = self.entity |
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281 |
metaattrs = entity.e_schema.meta_attributes() |
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282 |
for metaattr, (metadata, attr) in metaattrs.iteritems(): |
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283 |
if metadata == 'format' and attr in entity.edited_attributes: |
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284 |
try: |
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285 |
value = entity[attr] |
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286 |
except KeyError: |
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287 |
continue # no text to tidy |
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288 |
if isinstance(value, unicode): # filter out None and Binary |
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289 |
if getattr(entity, str(metaattr)) == 'text/html': |
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290 |
entity[attr] = soup2xhtml(value, self._cw.encoding) |
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291 |
|
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292 |
|
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293 |
class StripCWUserLoginHook(IntegrityHook): |
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294 |
"""ensure user logins are stripped""" |
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__regid__ = 'stripuserlogin' |
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__select__ = IntegrityHook.__select__ & implements('CWUser') |
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events = ('before_add_entity', 'before_update_entity',) |
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298 |
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2900 | 299 |
def __call__(self): |
300 |
user = self.entity |
|
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if 'login' in user.edited_attributes and user.login: |
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user.login = user.login.strip() |
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303 |
|
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304 |
|
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305 |
# 'active' integrity hooks: you usually don't want to deactivate them, they are |
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306 |
# not really integrity check, they maintain consistency on changes |
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307 |
|
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308 |
class _DelayedDeleteOp(hook.Operation): |
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309 |
"""delete the object of composite relation except if the relation has |
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310 |
actually been redirected to another composite |
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311 |
""" |
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312 |
key = base_rql = None |
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313 |
|
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314 |
def precommit_event(self): |
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315 |
session = self.session |
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316 |
pendingeids = session.transaction_data.get('pendingeids', ()) |
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317 |
neweids = session.transaction_data.get('neweids', ()) |
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318 |
# poping key is not optional: if further operation trigger new deletion |
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319 |
# of composite relation, we'll need a new operation |
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320 |
for eid, rtype in session.transaction_data.pop(self.key): |
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321 |
# don't do anything if the entity is being created or deleted |
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322 |
if not (eid in pendingeids or eid in neweids): |
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323 |
etype = session.describe(eid)[0] |
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#759035: Automate addition of eid cachekey in RQL analysis
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324 |
session.execute(self.base_rql % (etype, rtype), {'x': eid}) |
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325 |
|
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326 |
class _DelayedDeleteSEntityOp(_DelayedDeleteOp): |
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327 |
"""delete orphan subject entity of a composite relation""" |
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328 |
key = '_cwiscomp' |
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329 |
base_rql = 'DELETE %s X WHERE X eid %%(x)s, NOT X %s Y' |
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330 |
|
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331 |
class _DelayedDeleteOEntityOp(_DelayedDeleteOp): |
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332 |
"""check required object relation""" |
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333 |
key = '_cwiocomp' |
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334 |
base_rql = 'DELETE %s X WHERE X eid %%(x)s, NOT Y %s X' |
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335 |
|
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336 |
|
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337 |
class DeleteCompositeOrphanHook(hook.Hook): |
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338 |
"""delete the composed of a composite relation when this relation is deleted |
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339 |
""" |
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340 |
__regid__ = 'deletecomposite' |
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341 |
events = ('before_delete_relation',) |
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342 |
category = 'activeintegrity' |
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343 |
|
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344 |
def __call__(self): |
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345 |
# if the relation is being delete, don't delete composite's components |
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346 |
# automatically |
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|
347 |
pendingrdefs = self._cw.transaction_data.get('pendingrdefs', ()) |
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348 |
if (self._cw.describe(self.eidfrom)[0], self.rtype, |
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349 |
self._cw.describe(self.eidto)[0]) in pendingrdefs: |
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350 |
return |
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351 |
composite = self._cw.schema_rproperty(self.rtype, self.eidfrom, self.eidto, |
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352 |
'composite') |
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353 |
if composite == 'subject': |
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354 |
set_operation(self._cw, '_cwiocomp', (self.eidto, self.rtype), |
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355 |
_DelayedDeleteOEntityOp) |
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356 |
elif composite == 'object': |
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357 |
set_operation(self._cw, '_cwiscomp', (self.eidfrom, self.rtype), |
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358 |
_DelayedDeleteSEntityOp) |