"""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
:organization: Logilab
:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
__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 logilab.common.testlib import mock_object
from cubicweb import ValidationError
from cubicweb.selectors import implements
from cubicweb.schema import META_RTYPES, VIRTUAL_RTYPES, CONSTRAINTS, display_name
from cubicweb.server import hook, schemaserial as ss
from cubicweb.server.sqlutils import SQL_PREFIX
TYPE_CONVERTER = { # XXX
'Boolean': bool,
'Int': int,
'Float': float,
'Password': str,
'String': unicode,
'Date' : unicode,
'Datetime' : unicode,
'Time' : unicode,
}
# core entity and relation types which can't be removed
CORE_ETYPES = list(BASE_TYPES) + ['CWEType', 'CWRType', 'CWUser', 'CWGroup',
'CWConstraint', 'CWAttribute', 'CWRelation']
CORE_RTYPES = ['eid', 'creation_date', 'modification_date', 'cwuri',
'login', 'upassword', 'name',
'is', 'instanceof', 'owned_by', 'created_by', 'in_group',
'relation_type', 'from_entity', 'to_entity',
'constrainted_by',
'read_permission', 'add_permission',
'delete_permission', 'updated_permission',
]
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"""
table = SQL_PREFIX + etype
column = SQL_PREFIX + rtype
try:
session.system_sql(str('ALTER TABLE %s ADD COLUMN %s integer'
% (table, column)), rollback_on_failure=False)
session.info('added column %s to table %s', column, table)
except:
# 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.pool.source('system').create_index(session, table, column)
session.info('added index on %s(%s)', table, column)
session.transaction_data.setdefault('createdattrs', []).append(
'%s.%s' % (etype, rtype))
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.edited_attributes:
if attr in ro_attrs:
newval = entity.pop(attr)
origval = getattr(entity, attr)
if newval != origval:
errors[attr] = session._("can't change the %s attribute") % \
display_name(session, attr)
entity[attr] = newval
if errors:
raise ValidationError(entity.eid, errors)
# 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)
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
# drop index if any
session.pool.source('system').drop_index(session, table, column)
try:
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)
except Exception, ex:
# not supported by sqlite for instance
self.error('error while altering table %s: %s', table, ex)
# 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 commit_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:
self.critical('error while setting schmea', exc_info=True)
def rollback_event(self):
self.precommit_event()
class MemSchemaOperation(hook.Operation):
"""base class for schema operations"""
def __init__(self, session, kobj=None, **kwargs):
self.kobj = kobj
# once Operation.__init__ has been called, event may be triggered, so
# do this last !
hook.Operation.__init__(self, session, **kwargs)
# every schema operation is triggering a schema update
MemSchemaNotifyChanges(session)
def prepare_constraints(self, rdef):
# if 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)
self.constraints = rdef.constraints
class MemSchemaEarlyOperation(MemSchemaOperation):
def insert_index(self):
"""schema operation which are inserted at the begining of the queue
(typically to add/remove entity or relation types)
"""
i = -1
for i, op in enumerate(self.session.pending_operations):
if not isinstance(op, MemSchemaEarlyOperation):
return i
return i + 1
# operations for high-level source database alteration ########################
class SourceDbCWETypeRename(hook.Operation):
"""this operation updates physical storage accordingly"""
oldname = newname = None # make pylint happy
def precommit_event(self):
# we need sql to operate physical changes on the system database
sqlexec = self.session.system_sql
sqlexec('ALTER TABLE %s%s RENAME TO %s%s' % (SQL_PREFIX, self.oldname,
SQL_PREFIX, self.newname))
self.info('renamed table %s to %s', self.oldname, self.newname)
sqlexec('UPDATE entities SET type=%s WHERE type=%s',
(self.newname, self.oldname))
sqlexec('UPDATE deleted_entities SET type=%s WHERE type=%s',
(self.newname, self.oldname))
class SourceDbCWRTypeUpdate(hook.Operation):
"""actually update some properties of a relation definition"""
rschema = entity = values = None # make pylint happy
def precommit_event(self):
rschema = self.rschema
if rschema.final:
return
session = self.session
if 'fulltext_container' in self.values:
ftiupdates = session.transaction_data.setdefault(
'fti_update_etypes', set())
for subjtype, objtype in rschema.rdefs:
ftiupdates.add(subjtype)
ftiupdates.add(objtype)
UpdateFTIndexOp(session)
if not 'inlined' in self.values:
return # nothing to do
inlined = self.values['inlined']
# check in-lining is necessary / possible
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
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
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)
class SourceDbCWAttributeAdd(hook.Operation):
"""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
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})
subj = str(fromentity.name)
rtype = entity.rtype.name
obj = str(entity.otype.name)
constraints = get_constraints(self.session, entity)
rdef = ybo.RelationDefinition(subj, rtype, obj,
description=entity.description,
cardinality=entity.cardinality,
constraints=constraints,
order=entity.ordernum,
eid=entity.eid,
**kwargs)
MemSchemaRDefAdd(self.session, rdef)
return rdef
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}
rdef = self.init_rdef(**props)
sysource = session.pool.source('system')
attrtype = y2sql.type_from_constraints(
sysource.dbhelper, rdef.object, rdef.constraints)
# XXX should be moved somehow into lgc.adbh: sqlite doesn't support to
# add a new column with UNIQUE, it should be added after the ALTER TABLE
# using ADD INDEX
if sysource.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 + rdef.subject
column = SQL_PREFIX + rdef.name
try:
session.system_sql(str('ALTER TABLE %s ADD COLUMN %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:
sysource.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(rdef.subject)
except KeyError:
return # entity type currently being added
# propagate attribute to children classes
rschema = schema.rschema(rdef.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
# XXX 'infered': True/False, not clear actually
props.update({'constraints': rdef.constraints,
'description': rdef.description,
'cardinality': rdef.cardinality,
'constraints': rdef.constraints,
'permissions': rdef.get_permissions(),
'order': rdef.order,
'infered': False, 'eid': None
})
cstrtypemap = ss.cstrtype_mapping(session)
groupmap = group_mapping(session)
object = schema.eschema(rdef.object)
for specialization in eschema.specialized_by(False):
if (specialization, rdef.object) in rschema.rdefs:
continue
sperdef = RelationDefinitionSchema(specialization, rschema,
object, props)
ss.execschemarql(session.execute, sperdef,
ss.rdef2rql(sperdef, cstrtypemap, groupmap))
# 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})
class SourceDbCWRelationAdd(SourceDbCWAttributeAdd):
"""an actual relation has been added:
* 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
* 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 precommit_event(self):
session = self.session
entity = self.entity
rdef = self.init_rdef(composite=entity.composite)
schema = session.vreg.schema
rtype = rdef.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
# and if it has not been added during other event of the same
# transaction
key = '%s.%s' % (rdef.subject, rtype)
try:
alreadythere = bool(rschema.objects(rdef.subject))
except KeyError:
alreadythere = False
if not (alreadythere or
key in session.transaction_data.get('createdattrs', ())):
add_inline_relation_column(session, rdef.subject, rtype)
else:
# 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 (rschema.subjects() or
rtype in session.transaction_data.get('createdtables', ())):
try:
rschema = schema.rschema(rtype)
tablesql = y2sql.rschema2sql(rschema)
except KeyError:
# fake we add it to the schema now to get a correctly
# initialized schema but remove it before doing anything
# more dangerous...
rschema = schema.add_relation_type(rdef)
tablesql = y2sql.rschema2sql(rschema)
schema.del_relation_type(rtype)
# create the necessary table
for sql in tablesql.split(';'):
if sql.strip():
session.system_sql(sql)
session.transaction_data.setdefault('createdtables', []).append(
rtype)
class SourceDbRDefUpdate(hook.Operation):
"""actually update some properties of a relation definition"""
rschema = values = None # make pylint happy
def precommit_event(self):
session = self.session
etype = self.kobj[0]
table = SQL_PREFIX + etype
column = SQL_PREFIX + self.rschema.type
if 'indexed' in self.values:
sysource = session.pool.source('system')
if self.values['indexed']:
sysource.create_index(session, table, column)
else:
sysource.drop_index(session, table, column)
if 'cardinality' in self.values and self.rschema.final:
adbh = session.pool.source('system').dbhelper
if not adbh.alter_column_support:
# not supported (and NOT NULL not set by yams in that case, so
# no worry)
return
atype = self.rschema.objects(etype)[0]
constraints = self.rschema.rdef(etype, atype).constraints
coltype = y2sql.type_from_constraints(adbh, atype, constraints,
creating=False)
# XXX check self.values['cardinality'][0] actually changed?
notnull = self.values['cardinality'][0] != '1'
sql = adbh.sql_set_null_allowed(table, column, coltype, notnull)
session.system_sql(sql)
if 'fulltextindexed' in self.values:
UpdateFTIndexOp(session)
session.transaction_data.setdefault(
'fti_update_etypes', set()).add(etype)
class SourceDbCWConstraintAdd(hook.Operation):
"""actually update constraint of a relation definition"""
entity = None # make pylint happy
cancelled = False
def precommit_event(self):
rdef = self.entity.reverse_constrained_by[0]
session = self.session
# 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(rdef.eid):
return
rdefschema = session.vreg.schema.schema_by_eid(rdef.eid)
subjtype, rtype, objtype = rdefschema.as_triple()
cstrtype = self.entity.type
oldcstr = rtype.rdef(subjtype, objtype).constraint_by_type(cstrtype)
newcstr = CONSTRAINTS[cstrtype].deserialize(self.entity.value)
table = SQL_PREFIX + str(subjtype)
column = SQL_PREFIX + str(rtype)
# alter the physical schema on size constraint changes
if newcstr.type() == 'SizeConstraint' and (
oldcstr is None or oldcstr.max != newcstr.max):
adbh = self.session.pool.source('system').dbhelper
card = rtype.rdef(subjtype, objtype).cardinality
coltype = y2sql.type_from_constraints(adbh, objtype, [newcstr],
creating=False)
sql = adbh.sql_change_col_type(table, column, coltype, card != '1')
try:
session.system_sql(sql, rollback_on_failure=False)
self.info('altered column %s of table %s: now VARCHAR(%s)',
column, table, newcstr.max)
except Exception, ex:
# not supported by sqlite for instance
self.error('error while altering table %s: %s', table, ex)
elif cstrtype == 'UniqueConstraint' and oldcstr is None:
session.pool.source('system').create_index(
self.session, table, column, unique=True)
class SourceDbCWConstraintDel(hook.Operation):
"""actually remove a constraint of a relation definition"""
rtype = subjtype = None # make pylint happy
def precommit_event(self):
cstrtype = self.cstr.type()
table = SQL_PREFIX + str(self.subjtype)
column = SQL_PREFIX + str(self.rtype)
# alter the physical schema on size/unique constraint changes
if cstrtype == 'SizeConstraint':
try:
self.session.system_sql('ALTER TABLE %s ALTER COLUMN %s TYPE TEXT'
% (table, column),
rollback_on_failure=False)
self.info('altered column %s of table %s: now TEXT',
column, table)
except Exception, ex:
# not supported by sqlite for instance
self.error('error while altering table %s: %s', table, ex)
elif cstrtype == 'UniqueConstraint':
self.session.pool.source('system').drop_index(
self.session, table, column, unique=True)
# operations for in-memory schema synchronization #############################
class MemSchemaCWETypeAdd(MemSchemaEarlyOperation):
"""actually add the entity type to the instance's schema"""
eid = None # make pylint happy
def commit_event(self):
self.session.vreg.schema.add_entity_type(self.kobj)
class MemSchemaCWETypeRename(MemSchemaOperation):
"""this operation updates physical storage accordingly"""
oldname = newname = None # make pylint happy
def commit_event(self):
self.session.vreg.schema.rename_entity_type(self.oldname, self.newname)
class MemSchemaCWETypeDel(MemSchemaOperation):
"""actually remove the entity type from the instance's schema"""
def commit_event(self):
try:
# del_entity_type also removes entity's relations
self.session.vreg.schema.del_entity_type(self.kobj)
except KeyError:
# s/o entity type have already been deleted
pass
class MemSchemaCWRTypeAdd(MemSchemaEarlyOperation):
"""actually add the relation type to the instance's schema"""
eid = None # make pylint happy
def commit_event(self):
self.session.vreg.schema.add_relation_type(self.kobj)
class MemSchemaCWRTypeUpdate(MemSchemaOperation):
"""actually update some properties of a relation definition"""
rschema = values = None # make pylint happy
def commit_event(self):
# structure should be clean, not need to remove entity's relations
# at this point
self.rschema.__dict__.update(self.values)
class MemSchemaCWRTypeDel(MemSchemaOperation):
"""actually remove the relation type from the instance's schema"""
def commit_event(self):
try:
self.session.vreg.schema.del_relation_type(self.kobj)
except KeyError:
# s/o entity type have already been deleted
pass
class MemSchemaRDefAdd(MemSchemaEarlyOperation):
"""actually add the attribute relation definition to the instance's
schema
"""
def commit_event(self):
self.session.vreg.schema.add_relation_def(self.kobj)
class MemSchemaRDefUpdate(MemSchemaOperation):
"""actually update some properties of a relation definition"""
rschema = values = None # make pylint happy
def commit_event(self):
# structure should be clean, not need to remove entity's relations
# at this point
self.rschema.rdefs[self.kobj].update(self.values)
class MemSchemaRDefDel(MemSchemaOperation):
"""actually remove the relation definition from the instance's schema"""
def commit_event(self):
subjtype, rtype, objtype = self.kobj
try:
self.session.vreg.schema.del_relation_def(subjtype, rtype, objtype)
except KeyError:
# relation type may have been already deleted
pass
class MemSchemaCWConstraintAdd(MemSchemaOperation):
"""actually update constraint of a relation definition
has to be called before SourceDbCWConstraintAdd
"""
cancelled = False
def precommit_event(self):
rdef = 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 self.session.added_in_transaction(rdef.eid):
self.cancelled = True
return
rdef = self.session.vreg.schema.schema_by_eid(rdef.eid)
self.prepare_constraints(rdef)
cstrtype = self.entity.type
self.cstr = rdef.constraint_by_type(cstrtype)
self.newcstr = CONSTRAINTS[cstrtype].deserialize(self.entity.value)
self.newcstr.eid = self.entity.eid
def commit_event(self):
if self.cancelled:
return
# in-place modification
if not self.cstr is None:
self.constraints.remove(self.cstr)
self.constraints.append(self.newcstr)
class MemSchemaCWConstraintDel(MemSchemaOperation):
"""actually remove a constraint of a relation definition
has to be called before SourceDbCWConstraintDel
"""
rtype = subjtype = objtype = None # make pylint happy
def precommit_event(self):
self.prepare_constraints(self.rdef)
def commit_event(self):
self.constraints.remove(self.cstr)
class MemSchemaPermissionAdd(MemSchemaOperation):
"""synchronize schema when a *_permission relation has been added on a group
"""
def commit_event(self):
"""the observed connections pool 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 hasattr(self, 'group_eid'):
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)
class MemSchemaPermissionDel(MemSchemaPermissionAdd):
"""synchronize schema when a *_permission relation has been deleted from a
group
"""
def commit_event(self):
"""the observed connections pool 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 hasattr(self, 'group_eid'):
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)
class MemSchemaSpecializesAdd(MemSchemaOperation):
def commit_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)
class MemSchemaSpecializesDel(MemSchemaOperation):
def commit_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)
class SyncSchemaHook(hook.Hook):
__abstract__ = True
category = 'syncschema'
# 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__ & implements('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_ETYPES:
raise ValidationError(self.entity.eid, {None: self._cw._('can\'t be deleted')})
# delete every entities of this type
self._cw.execute('DELETE %s X' % name)
DropTable(self._cw, table=SQL_PREFIX + name)
MemSchemaCWETypeDel(self._cw, 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.get('final'):
return
schema = self._cw.vreg.schema
name = entity['name']
etype = ybo.EntityType(name=name, description=entity.get('description'),
meta=entity.get('meta')) # don't care about final
# fake we add it to the schema now to get a correctly initialized schema
# but remove it before doing anything more dangerous...
schema = self._cw.vreg.schema
eschema = schema.add_entity_type(etype)
# generate table sql and rql to add metadata
tablesql = y2sql.eschema2sql(self._cw.pool.source('system').dbhelper,
eschema, prefix=SQL_PREFIX)
rdefrqls = []
gmap = group_mapping(self._cw)
cmap = ss.cstrtype_mapping(self._cw)
for rtype in (META_RTYPES - VIRTUAL_RTYPES):
rschema = schema[rtype]
sampletype = rschema.subjects()[0]
desttype = rschema.objects()[0]
rdef = copy(rschema.rdef(sampletype, desttype))
rdef.subject = mock_object(eid=entity.eid)
mock = mock_object(eid=None)
rdefrqls.append( (mock, tuple(ss.rdef2rql(rdef, cmap, gmap))) )
# now remove it !
schema.del_entity_type(name)
# create the necessary table
for sql in tablesql.split(';'):
if sql.strip():
self._cw.system_sql(sql)
# register operation to modify the schema on commit
# this have to be done before adding other relations definitions
# or permission settings
etype.eid = entity.eid
MemSchemaCWETypeAdd(self._cw, etype)
# add meta relations
for rdef, relrqls in rdefrqls:
ss.execschemarql(self._cw.execute, rdef, relrqls)
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.edited_attributes:
newname = entity.pop('name')
oldname = entity.name
if newname.lower() != oldname.lower():
SourceDbCWETypeRename(self._cw, oldname=oldname, newname=newname)
MemSchemaCWETypeRename(self._cw, oldname=oldname, newname=newname)
entity['name'] = 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__ & implements('CWRType')
events = ('before_delete_entity',)
def __call__(self):
name = self.entity.name
if name in CORE_RTYPES:
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, 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
rtype = ybo.RelationType(name=entity.name,
description=entity.get('description'),
meta=entity.get('meta', False),
inlined=entity.get('inlined', False),
symmetric=entity.get('symmetric', False),
eid=entity.eid)
MemSchemaCWRTypeAdd(self._cw, rtype)
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.edited_attributes:
old, new = hook.entity_oldnewvalue(entity, prop)
if old != new:
newvalues[prop] = entity[prop]
if newvalues:
rschema = self._cw.vreg.schema.rschema(entity.name)
SourceDbCWRTypeUpdate(self._cw, rschema=rschema, entity=entity,
values=newvalues)
MemSchemaCWRTypeUpdate(self._cw, rschema=rschema, 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
rdef = session.vreg.schema.schema_by_eid(self.eidfrom)
subjschema, rschema, objschema = rdef.as_triple()
pendings = session.transaction_data.get('pendingeids', ())
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 (subjschema.eid in pendings or objschema.eid in pendings):
session.execute('DELETE X %s Y WHERE X is %s, Y is %s'
% (rschema, subjschema, objschema))
execute = session.execute
rset = execute('Any COUNT(X) WHERE X is %s, X relation_type R,'
'R eid %%(x)s' % rdeftype, {'x': self.eidto})
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 %%(x)s, X from_entity E, E name %%(name)s'
% rdeftype, {'x': self.eidto, 'name': str(subjschema)})
if rset[0][0] == 0 and not subjschema.eid in pendings:
ptypes = session.transaction_data.setdefault('pendingrtypes', set())
ptypes.add(rschema.type)
DropColumn(session, table=SQL_PREFIX + subjschema.type,
column=SQL_PREFIX + rschema.type)
elif lastrel:
DropRelationTable(session, rschema.type)
# if this is the last instance, drop associated relation type
if lastrel and not self.eidto in pendings:
execute('DELETE CWRType X WHERE X eid %(x)s', {'x': self.eidto})
MemSchemaRDefDel(session, (subjschema, rschema, objschema))
# CWAttribute / CWRelation hooks ###############################################
class AfterAddCWAttributeHook(SyncSchemaHook):
__regid__ = 'syncaddcwattribute'
__select__ = SyncSchemaHook.__select__ & implements('CWAttribute')
events = ('after_add_entity',)
def __call__(self):
SourceDbCWAttributeAdd(self._cw, entity=self.entity)
class AfterAddCWRelationHook(AfterAddCWAttributeHook):
__regid__ = 'syncaddcwrelation'
__select__ = SyncSchemaHook.__select__ & implements('CWRelation')
def __call__(self):
SourceDbCWRelationAdd(self._cw, entity=self.entity)
class AfterUpdateCWRDefHook(SyncSchemaHook):
__regid__ = 'syncaddcwattribute'
__select__ = SyncSchemaHook.__select__ & implements('CWAttribute',
'CWRelation')
events = ('before_update_entity',)
def __call__(self):
entity = self.entity
if self._cw.deleted_in_transaction(entity.eid):
return
desttype = entity.otype.name
rschema = self._cw.vreg.schema[entity.rtype.name]
newvalues = {}
for prop in RelationDefinitionSchema.rproperty_defs(desttype):
if prop == 'constraints':
continue
if prop == 'order':
prop = 'ordernum'
if prop in entity.edited_attributes:
old, new = hook.entity_oldnewvalue(entity, prop)
if old != new:
newvalues[prop] = entity[prop]
if newvalues:
subjtype = entity.stype.name
MemSchemaRDefUpdate(self._cw, kobj=(subjtype, desttype),
rschema=rschema, values=newvalues)
SourceDbRDefUpdate(self._cw, kobj=(subjtype, desttype),
rschema=rschema, values=newvalues)
# constraints synchronization hooks ############################################
class AfterAddCWConstraintHook(SyncSchemaHook):
__regid__ = 'syncaddcwconstraint'
__select__ = SyncSchemaHook.__select__ & implements('CWConstraint')
events = ('after_add_entity', 'after_update_entity')
def __call__(self):
MemSchemaCWConstraintAdd(self._cw, entity=self.entity)
SourceDbCWConstraintAdd(self._cw, entity=self.entity)
class AfterAddConstrainedByHook(SyncSchemaHook):
__regid__ = 'syncdelconstrainedby'
__select__ = SyncSchemaHook.__select__ & hook.match_rtype('constrained_by')
events = ('after_add_relation',)
def __call__(self):
if self._cw.added_in_transaction(self.eidfrom):
self._cw.transaction_data.setdefault(self.eidfrom, []).append(self.eidto)
class BeforeDeleteConstrainedByHook(AfterAddConstrainedByHook):
__regid__ = 'syncdelconstrainedby'
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:
SourceDbCWConstraintDel(self._cw, cstr=cstr,
subjtype=rdef.subject, rtype=rdef.rtype)
MemSchemaCWConstraintDel(self._cw, rdef=rdef, cstr=cstr)
# 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.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
to_reindex = session.transaction_data.get('fti_update_etypes', ())
self.info('%i etypes need full text indexed reindexation',
len(to_reindex))
schema = self.session.repo.vreg.schema
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_entity(session, entity.eid)
for container in entity.fti_containers():
if still_fti or container is not entity:
source.fti_unindex_entity(session, entity.eid)
source.fti_index_entity(session, container)
if len(to_reindex):
# Transaction have already been committed
session.pool.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)