# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""schema hooks:
- synchronize the living schema object with the persistent schema
- perform physical update on the source when necessary
checking for schema consistency is done in hooks.py
"""
__docformat__ = "restructuredtext en"
from copy import copy
from yams.schema import BASE_TYPES, RelationSchema, RelationDefinitionSchema
from yams import buildobjs as ybo, schema2sql as y2sql
from logilab.common.decorators import clear_cache
from cubicweb import ValidationError
from cubicweb.selectors import is_instance
from cubicweb.schema import (SCHEMA_TYPES, META_RTYPES, VIRTUAL_RTYPES,
CONSTRAINTS, ETYPE_NAME_MAP, display_name)
from cubicweb.server import hook, schemaserial as ss
from cubicweb.server.sqlutils import SQL_PREFIX
TYPE_CONVERTER = { # XXX
'Boolean': bool,
'Int': int,
'BigInt': int,
'Float': float,
'Password': str,
'String': unicode,
'Date' : unicode,
'Datetime' : unicode,
'Time' : unicode,
'TZDatetime' : unicode,
'TZTime' : unicode,
}
# core entity and relation types which can't be removed
CORE_TYPES = BASE_TYPES | SCHEMA_TYPES | META_RTYPES | set(
('CWUser', 'CWGroup','login', 'upassword', 'name', 'in_group'))
def get_constraints(session, entity):
constraints = []
for cstreid in session.transaction_data.get(entity.eid, ()):
cstrent = session.entity_from_eid(cstreid)
cstr = CONSTRAINTS[cstrent.type].deserialize(cstrent.value)
cstr.eid = cstreid
constraints.append(cstr)
return constraints
def group_mapping(cw):
try:
return cw.transaction_data['groupmap']
except KeyError:
cw.transaction_data['groupmap'] = gmap = ss.group_mapping(cw)
return gmap
def add_inline_relation_column(session, etype, rtype):
"""add necessary column and index for an inlined relation"""
attrkey = '%s.%s' % (etype, rtype)
createdattrs = session.transaction_data.setdefault('createdattrs', set())
if attrkey in createdattrs:
return
createdattrs.add(attrkey)
table = SQL_PREFIX + etype
column = SQL_PREFIX + rtype
try:
session.system_sql(str('ALTER TABLE %s ADD %s integer'
% (table, column)), rollback_on_failure=False)
session.info('added column %s to table %s', column, table)
except Exception:
# silent exception here, if this error has not been raised because the
# column already exists, index creation will fail anyway
session.exception('error while adding column %s to table %s',
table, column)
# create index before alter table which may expectingly fail during test
# (sqlite) while index creation should never fail (test for index existence
# is done by the dbhelper)
session.cnxset.source('system').create_index(session, table, column)
session.info('added index on %s(%s)', table, column)
def insert_rdef_on_subclasses(session, eschema, rschema, rdefdef, props):
# XXX 'infered': True/False, not clear actually
props.update({'constraints': rdefdef.constraints,
'description': rdefdef.description,
'cardinality': rdefdef.cardinality,
'permissions': rdefdef.get_permissions(),
'order': rdefdef.order,
'infered': False, 'eid': None
})
cstrtypemap = ss.cstrtype_mapping(session)
groupmap = group_mapping(session)
object = rschema.schema.eschema(rdefdef.object)
for specialization in eschema.specialized_by(False):
if (specialization, rdefdef.object) in rschema.rdefs:
continue
sperdef = RelationDefinitionSchema(specialization, rschema,
object, props)
ss.execschemarql(session.execute, sperdef,
ss.rdef2rql(sperdef, cstrtypemap, groupmap))
def check_valid_changes(session, entity, ro_attrs=('name', 'final')):
errors = {}
# don't use getattr(entity, attr), we would get the modified value if any
for attr in entity.cw_edited:
if attr in ro_attrs:
origval, newval = entity.cw_edited.oldnewvalue(attr)
if newval != origval:
errors[attr] = session._("can't change the %s attribute") % \
display_name(session, attr)
if errors:
raise ValidationError(entity.eid, errors)
class _MockEntity(object): # XXX use a named tuple with python 2.6
def __init__(self, eid):
self.eid = eid
class SyncSchemaHook(hook.Hook):
"""abstract class for schema synchronization hooks (in the `syncschema`
category)
"""
__abstract__ = True
category = 'syncschema'
# operations for low-level database alteration ################################
class DropTable(hook.Operation):
"""actually remove a database from the instance's schema"""
table = None # make pylint happy
def precommit_event(self):
dropped = self.session.transaction_data.setdefault('droppedtables',
set())
if self.table in dropped:
return # already processed
dropped.add(self.table)
self.session.system_sql('DROP TABLE %s' % self.table)
self.info('dropped table %s', self.table)
# XXX revertprecommit_event
class DropRelationTable(DropTable):
def __init__(self, session, rtype):
super(DropRelationTable, self).__init__(
session, table='%s_relation' % rtype)
session.transaction_data.setdefault('pendingrtypes', set()).add(rtype)
class DropColumn(hook.Operation):
"""actually remove the attribut's column from entity table in the system
database
"""
table = column = None # make pylint happy
def precommit_event(self):
session, table, column = self.session, self.table, self.column
source = session.repo.system_source
# drop index if any
source.drop_index(session, table, column)
if source.dbhelper.alter_column_support:
session.system_sql('ALTER TABLE %s DROP COLUMN %s'
% (table, column), rollback_on_failure=False)
self.info('dropped column %s from table %s', column, table)
else:
# not supported by sqlite for instance
self.error('dropping column not supported by the backend, handle '
'it yourself (%s.%s)', table, column)
# XXX revertprecommit_event
# base operations for in-memory schema synchronization ########################
class MemSchemaNotifyChanges(hook.SingleLastOperation):
"""the update schema operation:
special operation which should be called once and after all other schema
operations. It will trigger internal structures rebuilding to consider
schema changes.
"""
def __init__(self, session):
hook.SingleLastOperation.__init__(self, session)
def precommit_event(self):
for eschema in self.session.repo.schema.entities():
if not eschema.final:
clear_cache(eschema, 'ordered_relations')
def postcommit_event(self):
rebuildinfered = self.session.data.get('rebuild-infered', True)
repo = self.session.repo
# commit event should not raise error, while set_schema has chances to
# do so because it triggers full vreg reloading
try:
repo.set_schema(repo.schema, rebuildinfered=rebuildinfered)
# CWUser class might have changed, update current session users
cwuser_cls = self.session.vreg['etypes'].etype_class('CWUser')
for session in repo._sessions.values():
session.user.__class__ = cwuser_cls
except Exception:
self.critical('error while setting schema', exc_info=True)
def rollback_event(self):
self.precommit_event()
class MemSchemaOperation(hook.Operation):
"""base class for schema operations"""
def __init__(self, session, **kwargs):
hook.Operation.__init__(self, session, **kwargs)
# every schema operation is triggering a schema update
MemSchemaNotifyChanges(session)
# operations for high-level source database alteration ########################
class CWETypeAddOp(MemSchemaOperation):
"""after adding a CWEType entity:
* add it to the instance's schema
* create the necessary table
* set creation_date and modification_date by creating the necessary
CWAttribute entities
* add owned_by relation by creating the necessary CWRelation entity
"""
entity = None # make pylint happy
def precommit_event(self):
session = self.session
entity = self.entity
schema = session.vreg.schema
etype = ybo.EntityType(eid=entity.eid, name=entity.name,
description=entity.description)
eschema = schema.add_entity_type(etype)
# create the necessary table
tablesql = y2sql.eschema2sql(session.cnxset.source('system').dbhelper,
eschema, prefix=SQL_PREFIX)
for sql in tablesql.split(';'):
if sql.strip():
session.system_sql(sql)
# add meta relations
gmap = group_mapping(session)
cmap = ss.cstrtype_mapping(session)
for rtype in (META_RTYPES - VIRTUAL_RTYPES):
try:
rschema = schema[rtype]
except KeyError:
if rtype == 'cw_source':
continue # XXX 3.10 migration
raise
sampletype = rschema.subjects()[0]
desttype = rschema.objects()[0]
rdef = copy(rschema.rdef(sampletype, desttype))
rdef.subject = _MockEntity(eid=entity.eid)
mock = _MockEntity(eid=None)
ss.execschemarql(session.execute, mock, ss.rdef2rql(rdef, cmap, gmap))
def revertprecommit_event(self):
# revert changes on in memory schema
self.session.vreg.schema.del_entity_type(self.entity.name)
# revert changes on database
self.session.system_sql('DROP TABLE %s%s' % (SQL_PREFIX, self.entity.name))
class CWETypeRenameOp(MemSchemaOperation):
"""this operation updates physical storage accordingly"""
oldname = newname = None # make pylint happy
def rename(self, oldname, newname):
self.session.vreg.schema.rename_entity_type(oldname, newname)
# we need sql to operate physical changes on the system database
sqlexec = self.session.system_sql
dbhelper= self.session.cnxset.source('system').dbhelper
sql = dbhelper.sql_rename_table(SQL_PREFIX+oldname,
SQL_PREFIX+newname)
sqlexec(sql)
self.info('renamed table %s to %s', oldname, newname)
sqlexec('UPDATE entities SET type=%(newname)s WHERE type=%(oldname)s',
{'newname': newname, 'oldname': oldname})
sqlexec('UPDATE deleted_entities SET type=%(newname)s WHERE type=%(oldname)s',
{'newname': newname, 'oldname': oldname})
# XXX transaction records
def precommit_event(self):
self.rename(self.oldname, self.newname)
def revertprecommit_event(self):
self.rename(self.newname, self.oldname)
class CWRTypeUpdateOp(MemSchemaOperation):
"""actually update some properties of a relation definition"""
rschema = entity = values = None # make pylint happy
oldvalus = None
def precommit_event(self):
rschema = self.rschema
if rschema.final:
return # watched changes to final relation type are unexpected
session = self.session
if 'fulltext_container' in self.values:
op = UpdateFTIndexOp.get_instance(session)
for subjtype, objtype in rschema.rdefs:
op.add_data(subjtype)
op.add_data(objtype)
# update the in-memory schema first
self.oldvalues = dict( (attr, getattr(rschema, attr)) for attr in self.values)
self.rschema.__dict__.update(self.values)
# then make necessary changes to the system source database
if not 'inlined' in self.values:
return # nothing to do
inlined = self.values['inlined']
# check in-lining is possible when inlined
if inlined:
self.entity.check_inlined_allowed()
# inlined changed, make necessary physical changes!
sqlexec = self.session.system_sql
rtype = rschema.type
eidcolumn = SQL_PREFIX + 'eid'
if not inlined:
# need to create the relation if it has not been already done by
# another event of the same transaction
if not rschema.type in session.transaction_data.get('createdtables', ()):
tablesql = y2sql.rschema2sql(rschema)
# create the necessary table
for sql in tablesql.split(';'):
if sql.strip():
sqlexec(sql)
session.transaction_data.setdefault('createdtables', []).append(
rschema.type)
# copy existant data
column = SQL_PREFIX + rtype
for etype in rschema.subjects():
table = SQL_PREFIX + str(etype)
sqlexec('INSERT INTO %s_relation SELECT %s, %s FROM %s WHERE NOT %s IS NULL'
% (rtype, eidcolumn, column, table, column))
# drop existant columns
#if session.repo.system_source.dbhelper.alter_column_support:
for etype in rschema.subjects():
DropColumn(session, table=SQL_PREFIX + str(etype),
column=SQL_PREFIX + rtype)
else:
for etype in rschema.subjects():
try:
add_inline_relation_column(session, str(etype), rtype)
except Exception, ex:
# the column probably already exists. this occurs when the
# entity's type has just been added or if the column has not
# been previously dropped (eg sqlite)
self.error('error while altering table %s: %s', etype, ex)
# copy existant data.
# XXX don't use, it's not supported by sqlite (at least at when i tried it)
#sqlexec('UPDATE %(etype)s SET %(rtype)s=eid_to '
# 'FROM %(rtype)s_relation '
# 'WHERE %(etype)s.eid=%(rtype)s_relation.eid_from'
# % locals())
table = SQL_PREFIX + str(etype)
cursor = sqlexec('SELECT eid_from, eid_to FROM %(table)s, '
'%(rtype)s_relation WHERE %(table)s.%(eidcolumn)s='
'%(rtype)s_relation.eid_from' % locals())
args = [{'val': eid_to, 'x': eid} for eid, eid_to in cursor.fetchall()]
if args:
column = SQL_PREFIX + rtype
cursor.executemany('UPDATE %s SET %s=%%(val)s WHERE %s=%%(x)s'
% (table, column, eidcolumn), args)
# drop existant table
DropRelationTable(session, rtype)
def revertprecommit_event(self):
# revert changes on in memory schema
self.rschema.__dict__.update(self.oldvalues)
# XXX revert changes on database
class CWAttributeAddOp(MemSchemaOperation):
"""an attribute relation (CWAttribute) has been added:
* add the necessary column
* set default on this column if any and possible
* register an operation to add the relation definition to the
instance's schema on commit
constraints are handled by specific hooks
"""
entity = None # make pylint happy
def init_rdef(self, **kwargs):
entity = self.entity
fromentity = entity.stype
rdefdef = self.rdefdef = ybo.RelationDefinition(
str(fromentity.name), entity.rtype.name, str(entity.otype.name),
description=entity.description, cardinality=entity.cardinality,
constraints=get_constraints(self.session, entity),
order=entity.ordernum, eid=entity.eid, **kwargs)
self.session.vreg.schema.add_relation_def(rdefdef)
self.session.execute('SET X ordernum Y+1 '
'WHERE X from_entity SE, SE eid %(se)s, X ordernum Y, '
'X ordernum >= %(order)s, NOT X eid %(x)s',
{'x': entity.eid, 'se': fromentity.eid,
'order': entity.ordernum or 0})
return rdefdef
def precommit_event(self):
session = self.session
entity = self.entity
# entity.defaultval is a string or None, but we need a correctly typed
# value
default = entity.defaultval
if default is not None:
default = TYPE_CONVERTER[entity.otype.name](default)
props = {'default': default,
'indexed': entity.indexed,
'fulltextindexed': entity.fulltextindexed,
'internationalizable': entity.internationalizable}
# update the in-memory schema first
rdefdef = self.init_rdef(**props)
# then make necessary changes to the system source database
syssource = session.cnxset.source('system')
attrtype = y2sql.type_from_constraints(
syssource.dbhelper, rdefdef.object, rdefdef.constraints)
# XXX should be moved somehow into lgdb: sqlite doesn't support to
# add a new column with UNIQUE, it should be added after the ALTER TABLE
# using ADD INDEX
if syssource.dbdriver == 'sqlite' and 'UNIQUE' in attrtype:
extra_unique_index = True
attrtype = attrtype.replace(' UNIQUE', '')
else:
extra_unique_index = False
# added some str() wrapping query since some backend (eg psycopg) don't
# allow unicode queries
table = SQL_PREFIX + rdefdef.subject
column = SQL_PREFIX + rdefdef.name
try:
session.system_sql(str('ALTER TABLE %s ADD %s %s'
% (table, column, attrtype)),
rollback_on_failure=False)
self.info('added column %s to table %s', table, column)
except Exception, ex:
# the column probably already exists. this occurs when
# the entity's type has just been added or if the column
# has not been previously dropped
self.error('error while altering table %s: %s', table, ex)
if extra_unique_index or entity.indexed:
try:
syssource.create_index(session, table, column,
unique=extra_unique_index)
except Exception, ex:
self.error('error while creating index for %s.%s: %s',
table, column, ex)
# final relations are not infered, propagate
schema = session.vreg.schema
try:
eschema = schema.eschema(rdefdef.subject)
except KeyError:
return # entity type currently being added
# propagate attribute to children classes
rschema = schema.rschema(rdefdef.name)
# if relation type has been inserted in the same transaction, its final
# attribute is still set to False, so we've to ensure it's False
rschema.final = True
insert_rdef_on_subclasses(session, eschema, rschema, rdefdef, props)
# set default value, using sql for performance and to avoid
# modification_date update
if default:
session.system_sql('UPDATE %s SET %s=%%(default)s' % (table, column),
{'default': default})
def revertprecommit_event(self):
# revert changes on in memory schema
self.session.vreg.schema.del_relation_def(
self.rdefdef.subject, self.rdefdef.name, self.rdefdef.object)
# XXX revert changes on database
class CWRelationAddOp(CWAttributeAddOp):
"""an actual relation has been added:
* add the relation definition to the instance's schema
* if this is an inlined relation, add the necessary column else if it's the
first instance of this relation type, add the necessary table and set
default permissions
constraints are handled by specific hooks
"""
entity = None # make pylint happy
def precommit_event(self):
session = self.session
entity = self.entity
# update the in-memory schema first
rdefdef = self.init_rdef(composite=entity.composite)
# then make necessary changes to the system source database
schema = session.vreg.schema
rtype = rdefdef.name
rschema = schema.rschema(rtype)
# this have to be done before permissions setting
if rschema.inlined:
# need to add a column if the relation is inlined and if this is the
# first occurence of "Subject relation Something" whatever Something
if len(rschema.objects(rdefdef.subject)) == 1:
add_inline_relation_column(session, rdefdef.subject, rtype)
eschema = schema[rdefdef.subject]
insert_rdef_on_subclasses(session, eschema, rschema, rdefdef,
{'composite': entity.composite})
else:
if rschema.symmetric:
# for symmetric relations, rdefs will store relation definitions
# in both ways (i.e. (subj -> obj) and (obj -> subj))
relation_already_defined = len(rschema.rdefs) > 2
else:
relation_already_defined = len(rschema.rdefs) > 1
# need to create the relation if no relation definition in the
# schema and if it has not been added during other event of the same
# transaction
if not (relation_already_defined or
rtype in session.transaction_data.get('createdtables', ())):
rschema = schema.rschema(rtype)
# create the necessary table
for sql in y2sql.rschema2sql(rschema).split(';'):
if sql.strip():
session.system_sql(sql)
session.transaction_data.setdefault('createdtables', []).append(
rtype)
# XXX revertprecommit_event
class RDefDelOp(MemSchemaOperation):
"""an actual relation has been removed"""
rdef = None # make pylint happy
def precommit_event(self):
session = self.session
rdef = self.rdef
rschema = rdef.rtype
# make necessary changes to the system source database first
rdeftype = rschema.final and 'CWAttribute' or 'CWRelation'
execute = session.execute
rset = execute('Any COUNT(X) WHERE X is %s, X relation_type R,'
'R eid %%(x)s' % rdeftype, {'x': rschema.eid})
lastrel = rset[0][0] == 0
# we have to update physical schema systematically for final and inlined
# relations, but only if it's the last instance for this relation type
# for other relations
if (rschema.final or rschema.inlined):
rset = execute('Any COUNT(X) WHERE X is %s, X relation_type R, '
'R eid %%(r)s, X from_entity E, E eid %%(e)s'
% rdeftype,
{'r': rschema.eid, 'e': rdef.subject.eid})
if rset[0][0] == 0 and not session.deleted_in_transaction(rdef.subject.eid):
ptypes = session.transaction_data.setdefault('pendingrtypes', set())
ptypes.add(rschema.type)
DropColumn(session, table=SQL_PREFIX + str(rdef.subject),
column=SQL_PREFIX + str(rschema))
elif lastrel:
DropRelationTable(session, str(rschema))
# then update the in-memory schema
if rdef.subject not in ETYPE_NAME_MAP and rdef.object not in ETYPE_NAME_MAP:
rschema.del_relation_def(rdef.subject, rdef.object)
# if this is the last relation definition of this type, drop associated
# relation type
if lastrel and not session.deleted_in_transaction(rschema.eid):
execute('DELETE CWRType X WHERE X eid %(x)s', {'x': rschema.eid})
def revertprecommit_event(self):
# revert changes on in memory schema
#
# Note: add_relation_def takes a RelationDefinition, not a
# RelationDefinitionSchema, needs to fake it
rdef = self.rdef
rdef.name = str(rdef.rtype)
if rdef.subject not in ETYPE_NAME_MAP and rdef.object not in ETYPE_NAME_MAP:
self.session.vreg.schema.add_relation_def(rdef)
class RDefUpdateOp(MemSchemaOperation):
"""actually update some properties of a relation definition"""
rschema = rdefkey = values = None # make pylint happy
rdef = oldvalues = None
indexed_changed = null_allowed_changed = False
def precommit_event(self):
session = self.session
rdef = self.rdef = self.rschema.rdefs[self.rdefkey]
# update the in-memory schema first
self.oldvalues = dict( (attr, getattr(rdef, attr)) for attr in self.values)
rdef.update(self.values)
# then make necessary changes to the system source database
syssource = session.cnxset.source('system')
if 'indexed' in self.values:
syssource.update_rdef_indexed(session, rdef)
self.indexed_changed = True
if 'cardinality' in self.values and (rdef.rtype.final or
rdef.rtype.inlined) \
and self.values['cardinality'][0] != self.oldvalues['cardinality'][0]:
syssource.update_rdef_null_allowed(self.session, rdef)
self.null_allowed_changed = True
if 'fulltextindexed' in self.values:
UpdateFTIndexOp.get_instance(session).add_data(rdef.subject)
def revertprecommit_event(self):
if self.rdef is None:
return
# revert changes on in memory schema
self.rdef.update(self.oldvalues)
# revert changes on database
syssource = self.session.cnxset.source('system')
if self.indexed_changed:
syssource.update_rdef_indexed(self.session, self.rdef)
if self.null_allowed_changed:
syssource.update_rdef_null_allowed(self.session, self.rdef)
def _set_modifiable_constraints(rdef):
# for proper in-place modification of in-memory schema: if rdef.constraints
# is already a list, reuse it (we're updating multiple constraints of the
# same rdef in the same transactions)
if not isinstance(rdef.constraints, list):
rdef.constraints = list(rdef.constraints)
class CWConstraintDelOp(MemSchemaOperation):
"""actually remove a constraint of a relation definition"""
rdef = oldcstr = newcstr = None # make pylint happy
size_cstr_changed = unique_changed = False
def precommit_event(self):
session = self.session
rdef = self.rdef
# in-place modification of in-memory schema first
_set_modifiable_constraints(rdef)
rdef.constraints.remove(self.oldcstr)
# then update database: alter the physical schema on size/unique
# constraint changes
syssource = session.cnxset.source('system')
cstrtype = self.oldcstr.type()
if cstrtype == 'SizeConstraint':
syssource.update_rdef_column(session, rdef)
self.size_cstr_changed = True
elif cstrtype == 'UniqueConstraint':
syssource.update_rdef_unique(session, rdef)
self.unique_changed = True
def revertprecommit_event(self):
# revert changes on in memory schema
if self.newcstr is not None:
self.rdef.constraints.remove(self.newcstr)
if self.oldcstr is not None:
self.rdef.constraints.append(self.oldcstr)
# revert changes on database
syssource = self.session.cnxset.source('system')
if self.size_cstr_changed:
syssource.update_rdef_column(self.session, self.rdef)
if self.unique_changed:
syssource.update_rdef_unique(self.session, self.rdef)
class CWConstraintAddOp(CWConstraintDelOp):
"""actually update constraint of a relation definition"""
entity = None # make pylint happy
def precommit_event(self):
session = self.session
rdefentity = self.entity.reverse_constrained_by[0]
# when the relation is added in the same transaction, the constraint
# object is created by the operation adding the attribute or relation,
# so there is nothing to do here
if session.added_in_transaction(rdefentity.eid):
return
rdef = self.rdef = session.vreg.schema.schema_by_eid(rdefentity.eid)
cstrtype = self.entity.type
oldcstr = self.oldcstr = rdef.constraint_by_type(cstrtype)
newcstr = self.newcstr = CONSTRAINTS[cstrtype].deserialize(self.entity.value)
# in-place modification of in-memory schema first
_set_modifiable_constraints(rdef)
newcstr.eid = self.entity.eid
if oldcstr is not None:
rdef.constraints.remove(oldcstr)
rdef.constraints.append(newcstr)
# then update database: alter the physical schema on size/unique
# constraint changes
syssource = session.cnxset.source('system')
if cstrtype == 'SizeConstraint' and (oldcstr is None or
oldcstr.max != newcstr.max):
syssource.update_rdef_column(session, rdef)
self.size_cstr_changed = True
elif cstrtype == 'UniqueConstraint' and oldcstr is None:
syssource.update_rdef_unique(session, rdef)
self.unique_changed = True
class CWUniqueTogetherConstraintAddOp(MemSchemaOperation):
entity = None # make pylint happy
def precommit_event(self):
session = self.session
prefix = SQL_PREFIX
table = '%s%s' % (prefix, self.entity.constraint_of[0].name)
cols = ['%s%s' % (prefix, r.name) for r in self.entity.relations]
dbhelper= session.cnxset.source('system').dbhelper
sqls = dbhelper.sqls_create_multicol_unique_index(table, cols)
for sql in sqls:
session.system_sql(sql)
# XXX revertprecommit_event
def postcommit_event(self):
eschema = self.session.vreg.schema.schema_by_eid(self.entity.constraint_of[0].eid)
attrs = [r.name for r in self.entity.relations]
eschema._unique_together.append(attrs)
class CWUniqueTogetherConstraintDelOp(MemSchemaOperation):
entity = oldcstr = None # for pylint
cols = [] # for pylint
def precommit_event(self):
session = self.session
prefix = SQL_PREFIX
table = '%s%s' % (prefix, self.entity.type)
dbhelper= session.cnxset.source('system').dbhelper
cols = ['%s%s' % (prefix, c) for c in self.cols]
sqls = dbhelper.sqls_drop_multicol_unique_index(table, cols)
for sql in sqls:
session.system_sql(sql)
# XXX revertprecommit_event
def postcommit_event(self):
eschema = self.session.vreg.schema.schema_by_eid(self.entity.eid)
cols = set(self.cols)
unique_together = [ut for ut in eschema._unique_together
if set(ut) != cols]
eschema._unique_together = unique_together
# operations for in-memory schema synchronization #############################
class MemSchemaCWETypeDel(MemSchemaOperation):
"""actually remove the entity type from the instance's schema"""
etype = None # make pylint happy
def postcommit_event(self):
# del_entity_type also removes entity's relations
self.session.vreg.schema.del_entity_type(self.etype)
class MemSchemaCWRTypeAdd(MemSchemaOperation):
"""actually add the relation type to the instance's schema"""
rtypedef = None # make pylint happy
def precommit_event(self):
self.session.vreg.schema.add_relation_type(self.rtypedef)
def revertprecommit_event(self):
self.session.vreg.schema.del_relation_type(self.rtypedef.name)
class MemSchemaCWRTypeDel(MemSchemaOperation):
"""actually remove the relation type from the instance's schema"""
rtype = None # make pylint happy
def postcommit_event(self):
try:
self.session.vreg.schema.del_relation_type(self.rtype)
except KeyError:
# s/o entity type have already been deleted
pass
class MemSchemaPermissionAdd(MemSchemaOperation):
"""synchronize schema when a *_permission relation has been added on a group
"""
eid = action = group_eid = expr = None # make pylint happy
def precommit_event(self):
"""the observed connections.cnxset has been commited"""
try:
erschema = self.session.vreg.schema.schema_by_eid(self.eid)
except KeyError:
# duh, schema not found, log error and skip operation
self.warning('no schema for %s', self.eid)
return
perms = list(erschema.action_permissions(self.action))
if self.group_eid is not None:
perm = self.session.entity_from_eid(self.group_eid).name
else:
perm = erschema.rql_expression(self.expr)
try:
perms.index(perm)
self.warning('%s already in permissions for %s on %s',
perm, self.action, erschema)
except ValueError:
perms.append(perm)
erschema.set_action_permissions(self.action, perms)
# XXX revertprecommit_event
class MemSchemaPermissionDel(MemSchemaPermissionAdd):
"""synchronize schema when a *_permission relation has been deleted from a
group
"""
def precommit_event(self):
"""the observed connections set has been commited"""
try:
erschema = self.session.vreg.schema.schema_by_eid(self.eid)
except KeyError:
# duh, schema not found, log error and skip operation
self.warning('no schema for %s', self.eid)
return
if isinstance(erschema, RelationSchema): # XXX 3.6 migration
return
if isinstance(erschema, RelationDefinitionSchema) and \
self.action in ('delete', 'add'): # XXX 3.6.1 migration
return
perms = list(erschema.action_permissions(self.action))
if self.group_eid is not None:
perm = self.session.entity_from_eid(self.group_eid).name
else:
perm = erschema.rql_expression(self.expr)
try:
perms.remove(perm)
erschema.set_action_permissions(self.action, perms)
except ValueError:
self.error('can\'t remove permission %s for %s on %s',
perm, self.action, erschema)
# XXX revertprecommit_event
class MemSchemaSpecializesAdd(MemSchemaOperation):
etypeeid = parentetypeeid = None # make pylint happy
def precommit_event(self):
eschema = self.session.vreg.schema.schema_by_eid(self.etypeeid)
parenteschema = self.session.vreg.schema.schema_by_eid(self.parentetypeeid)
eschema._specialized_type = parenteschema.type
parenteschema._specialized_by.append(eschema.type)
# XXX revertprecommit_event
class MemSchemaSpecializesDel(MemSchemaOperation):
etypeeid = parentetypeeid = None # make pylint happy
def precommit_event(self):
try:
eschema = self.session.vreg.schema.schema_by_eid(self.etypeeid)
parenteschema = self.session.vreg.schema.schema_by_eid(self.parentetypeeid)
except KeyError:
# etype removed, nothing to do
return
eschema._specialized_type = None
parenteschema._specialized_by.remove(eschema.type)
# XXX revertprecommit_event
# CWEType hooks ################################################################
class DelCWETypeHook(SyncSchemaHook):
"""before deleting a CWEType entity:
* check that we don't remove a core entity type
* cascade to delete related CWAttribute and CWRelation entities
* instantiate an operation to delete the entity type on commit
"""
__regid__ = 'syncdelcwetype'
__select__ = SyncSchemaHook.__select__ & is_instance('CWEType')
events = ('before_delete_entity',)
def __call__(self):
# final entities can't be deleted, don't care about that
name = self.entity.name
if name in CORE_TYPES:
raise ValidationError(self.entity.eid, {None: self._cw._('can\'t be deleted')})
# delete every entities of this type
if name not in ETYPE_NAME_MAP:
self._cw.execute('DELETE %s X' % name)
MemSchemaCWETypeDel(self._cw, etype=name)
DropTable(self._cw, table=SQL_PREFIX + name)
class AfterDelCWETypeHook(DelCWETypeHook):
__regid__ = 'wfcleanup'
events = ('after_delete_entity',)
def __call__(self):
# workflow cleanup
self._cw.execute('DELETE Workflow X WHERE NOT X workflow_of Y')
class AfterAddCWETypeHook(DelCWETypeHook):
"""after adding a CWEType entity:
* create the necessary table
* set creation_date and modification_date by creating the necessary
CWAttribute entities
* add owned_by relation by creating the necessary CWRelation entity
* register an operation to add the entity type to the instance's
schema on commit
"""
__regid__ = 'syncaddcwetype'
events = ('after_add_entity',)
def __call__(self):
entity = self.entity
if entity.cw_edited.get('final'):
# final entity types don't need a table in the database and are
# systematically added by yams at schema initialization time so
# there is no need to do further processing. Simply assign its eid.
self._cw.vreg.schema[entity.name].eid = entity.eid
return
CWETypeAddOp(self._cw, entity=entity)
class BeforeUpdateCWETypeHook(DelCWETypeHook):
"""check name change, handle final"""
__regid__ = 'syncupdatecwetype'
events = ('before_update_entity',)
def __call__(self):
entity = self.entity
check_valid_changes(self._cw, entity, ro_attrs=('final',))
# don't use getattr(entity, attr), we would get the modified value if any
if 'name' in entity.cw_edited:
oldname, newname = entity.cw_edited.oldnewvalue('name')
if newname.lower() != oldname.lower():
CWETypeRenameOp(self._cw, oldname=oldname, newname=newname)
# CWRType hooks ################################################################
class DelCWRTypeHook(SyncSchemaHook):
"""before deleting a CWRType entity:
* check that we don't remove a core relation type
* cascade to delete related CWAttribute and CWRelation entities
* instantiate an operation to delete the relation type on commit
"""
__regid__ = 'syncdelcwrtype'
__select__ = SyncSchemaHook.__select__ & is_instance('CWRType')
events = ('before_delete_entity',)
def __call__(self):
name = self.entity.name
if name in CORE_TYPES:
raise ValidationError(self.entity.eid, {None: self._cw._('can\'t be deleted')})
# delete relation definitions using this relation type
self._cw.execute('DELETE CWAttribute X WHERE X relation_type Y, Y eid %(x)s',
{'x': self.entity.eid})
self._cw.execute('DELETE CWRelation X WHERE X relation_type Y, Y eid %(x)s',
{'x': self.entity.eid})
MemSchemaCWRTypeDel(self._cw, rtype=name)
class AfterAddCWRTypeHook(DelCWRTypeHook):
"""after a CWRType entity has been added:
* register an operation to add the relation type to the instance's
schema on commit
We don't know yet this point if a table is necessary
"""
__regid__ = 'syncaddcwrtype'
events = ('after_add_entity',)
def __call__(self):
entity = self.entity
rtypedef = ybo.RelationType(name=entity.name,
description=entity.description,
inlined=entity.cw_edited.get('inlined', False),
symmetric=entity.cw_edited.get('symmetric', False),
eid=entity.eid)
MemSchemaCWRTypeAdd(self._cw, rtypedef=rtypedef)
class BeforeUpdateCWRTypeHook(DelCWRTypeHook):
"""check name change, handle final"""
__regid__ = 'syncupdatecwrtype'
events = ('before_update_entity',)
def __call__(self):
entity = self.entity
check_valid_changes(self._cw, entity)
newvalues = {}
for prop in ('symmetric', 'inlined', 'fulltext_container'):
if prop in entity.cw_edited:
old, new = entity.cw_edited.oldnewvalue(prop)
if old != new:
newvalues[prop] = new
if newvalues:
rschema = self._cw.vreg.schema.rschema(entity.name)
CWRTypeUpdateOp(self._cw, rschema=rschema, entity=entity,
values=newvalues)
class AfterDelRelationTypeHook(SyncSchemaHook):
"""before deleting a CWAttribute or CWRelation entity:
* if this is a final or inlined relation definition, instantiate an
operation to drop necessary column, else if this is the last instance
of a non final relation, instantiate an operation to drop necessary
table
* instantiate an operation to delete the relation definition on commit
* delete the associated relation type when necessary
"""
__regid__ = 'syncdelrelationtype'
__select__ = SyncSchemaHook.__select__ & hook.match_rtype('relation_type')
events = ('after_delete_relation',)
def __call__(self):
session = self._cw
try:
rdef = session.vreg.schema.schema_by_eid(self.eidfrom)
except KeyError:
self.critical('cant get schema rdef associated to %s', self.eidfrom)
return
subjschema, rschema, objschema = rdef.as_triple()
pendingrdefs = session.transaction_data.setdefault('pendingrdefs', set())
# first delete existing relation if necessary
if rschema.final:
rdeftype = 'CWAttribute'
pendingrdefs.add((subjschema, rschema))
else:
rdeftype = 'CWRelation'
pendingrdefs.add((subjschema, rschema, objschema))
if not (session.deleted_in_transaction(subjschema.eid) or
session.deleted_in_transaction(objschema.eid)):
session.execute('DELETE X %s Y WHERE X is %s, Y is %s'
% (rschema, subjschema, objschema))
RDefDelOp(session, rdef=rdef)
# CWAttribute / CWRelation hooks ###############################################
class AfterAddCWAttributeHook(SyncSchemaHook):
__regid__ = 'syncaddcwattribute'
__select__ = SyncSchemaHook.__select__ & is_instance('CWAttribute')
events = ('after_add_entity',)
def __call__(self):
CWAttributeAddOp(self._cw, entity=self.entity)
class AfterAddCWRelationHook(AfterAddCWAttributeHook):
__regid__ = 'syncaddcwrelation'
__select__ = SyncSchemaHook.__select__ & is_instance('CWRelation')
def __call__(self):
CWRelationAddOp(self._cw, entity=self.entity)
class AfterUpdateCWRDefHook(SyncSchemaHook):
__regid__ = 'syncaddcwattribute'
__select__ = SyncSchemaHook.__select__ & is_instance('CWAttribute',
'CWRelation')
events = ('before_update_entity',)
def __call__(self):
entity = self.entity
if self._cw.deleted_in_transaction(entity.eid):
return
subjtype = entity.stype.name
objtype = entity.otype.name
if subjtype in ETYPE_NAME_MAP or objtype in ETYPE_NAME_MAP:
return
rschema = self._cw.vreg.schema[entity.rtype.name]
# note: do not access schema rdef here, it may be added later by an
# operation
newvalues = {}
for prop in RelationDefinitionSchema.rproperty_defs(objtype):
if prop == 'constraints':
continue
if prop == 'order':
attr = 'ordernum'
else:
attr = prop
if attr in entity.cw_edited:
old, new = entity.cw_edited.oldnewvalue(attr)
if old != new:
newvalues[prop] = new
if newvalues:
RDefUpdateOp(self._cw, rschema=rschema, rdefkey=(subjtype, objtype),
values=newvalues)
# constraints synchronization hooks ############################################
class AfterAddCWConstraintHook(SyncSchemaHook):
__regid__ = 'syncaddcwconstraint'
__select__ = SyncSchemaHook.__select__ & is_instance('CWConstraint')
events = ('after_add_entity', 'after_update_entity')
def __call__(self):
CWConstraintAddOp(self._cw, entity=self.entity)
class AfterAddConstrainedByHook(SyncSchemaHook):
__regid__ = 'syncaddconstrainedby'
__select__ = SyncSchemaHook.__select__ & hook.match_rtype('constrained_by')
events = ('after_add_relation',)
def __call__(self):
if self._cw.added_in_transaction(self.eidfrom):
# used by get_constraints() which is called in CWAttributeAddOp
self._cw.transaction_data.setdefault(self.eidfrom, []).append(self.eidto)
class BeforeDeleteConstrainedByHook(SyncSchemaHook):
__regid__ = 'syncdelconstrainedby'
__select__ = SyncSchemaHook.__select__ & hook.match_rtype('constrained_by')
events = ('before_delete_relation',)
def __call__(self):
if self._cw.deleted_in_transaction(self.eidfrom):
return
schema = self._cw.vreg.schema
entity = self._cw.entity_from_eid(self.eidto)
rdef = schema.schema_by_eid(self.eidfrom)
try:
cstr = rdef.constraint_by_type(entity.type)
except IndexError:
self._cw.critical('constraint type no more accessible')
else:
CWConstraintDelOp(self._cw, rdef=rdef, oldcstr=cstr)
# unique_together constraints
# XXX: use setoperations and before_add_relation here (on constraint_of and relations)
class AfterAddCWUniqueTogetherConstraintHook(SyncSchemaHook):
__regid__ = 'syncadd_cwuniquetogether_constraint'
__select__ = SyncSchemaHook.__select__ & is_instance('CWUniqueTogetherConstraint')
events = ('after_add_entity',)
def __call__(self):
CWUniqueTogetherConstraintAddOp(self._cw, entity=self.entity)
class BeforeDeleteConstraintOfHook(SyncSchemaHook):
__regid__ = 'syncdelconstraintof'
__select__ = SyncSchemaHook.__select__ & hook.match_rtype('constraint_of')
events = ('before_delete_relation',)
def __call__(self):
if self._cw.deleted_in_transaction(self.eidto):
return
schema = self._cw.vreg.schema
cstr = self._cw.entity_from_eid(self.eidfrom)
entity = schema.schema_by_eid(self.eidto)
cols = [r.name for r in cstr.relations]
CWUniqueTogetherConstraintDelOp(self._cw, entity=entity,
oldcstr=cstr, cols=cols)
# permissions synchronization hooks ############################################
class AfterAddPermissionHook(SyncSchemaHook):
"""added entity/relation *_permission, need to update schema"""
__regid__ = 'syncaddperm'
__select__ = SyncSchemaHook.__select__ & hook.match_rtype(
'read_permission', 'add_permission', 'delete_permission',
'update_permission')
events = ('after_add_relation',)
def __call__(self):
action = self.rtype.split('_', 1)[0]
if self._cw.describe(self.eidto)[0] == 'CWGroup':
MemSchemaPermissionAdd(self._cw, action=action, eid=self.eidfrom,
group_eid=self.eidto)
else: # RQLExpression
expr = self._cw.entity_from_eid(self.eidto).expression
MemSchemaPermissionAdd(self._cw, action=action, eid=self.eidfrom,
expr=expr)
class BeforeDelPermissionHook(AfterAddPermissionHook):
"""delete entity/relation *_permission, need to update schema
skip the operation if the related type is being deleted
"""
__regid__ = 'syncdelperm'
events = ('before_delete_relation',)
def __call__(self):
if self._cw.deleted_in_transaction(self.eidfrom):
return
action = self.rtype.split('_', 1)[0]
if self._cw.describe(self.eidto)[0] == 'CWGroup':
MemSchemaPermissionDel(self._cw, action=action, eid=self.eidfrom,
group_eid=self.eidto)
else: # RQLExpression
expr = self._cw.entity_from_eid(self.eidto).expression
MemSchemaPermissionDel(self._cw, action=action, eid=self.eidfrom,
expr=expr)
class UpdateFTIndexOp(hook.DataOperationMixIn, hook.SingleLastOperation):
"""operation to update full text indexation of entity whose schema change
We wait after the commit to as the schema in memory is only updated after
the commit.
"""
def postcommit_event(self):
session = self.session
source = session.repo.system_source
schema = session.repo.vreg.schema
to_reindex = self.get_data()
self.info('%i etypes need full text indexed reindexation',
len(to_reindex))
for etype in to_reindex:
rset = session.execute('Any X WHERE X is %s' % etype)
self.info('Reindexing full text index for %i entity of type %s',
len(rset), etype)
still_fti = list(schema[etype].indexable_attributes())
for entity in rset.entities():
source.fti_unindex_entities(session, [entity])
for container in entity.cw_adapt_to('IFTIndexable').fti_containers():
if still_fti or container is not entity:
source.fti_unindex_entities(session, [container])
source.fti_index_entities(session, [container])
if to_reindex:
# Transaction has already been committed
session.cnxset.commit()
# specializes synchronization hooks ############################################
class AfterAddSpecializesHook(SyncSchemaHook):
__regid__ = 'syncaddspecializes'
__select__ = SyncSchemaHook.__select__ & hook.match_rtype('specializes')
events = ('after_add_relation',)
def __call__(self):
MemSchemaSpecializesAdd(self._cw, etypeeid=self.eidfrom,
parentetypeeid=self.eidto)
class AfterDelSpecializesHook(SyncSchemaHook):
__regid__ = 'syncdelspecializes'
__select__ = SyncSchemaHook.__select__ & hook.match_rtype('specializes')
events = ('after_delete_relation',)
def __call__(self):
MemSchemaSpecializesDel(self._cw, etypeeid=self.eidfrom,
parentetypeeid=self.eidto)