# 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/>.
"""cubicweb server sources support"""
__docformat__ = "restructuredtext en"
import itertools
from os.path import join, splitext
from datetime import datetime, timedelta
from logging import getLogger
from logilab.common import configuration
from logilab.common.deprecation import deprecated
from yams.schema import role_name
from cubicweb import ValidationError, set_log_methods, server
from cubicweb.schema import VIRTUAL_RTYPES
from cubicweb.server.sqlutils import SQL_PREFIX
from cubicweb.server.edition import EditedEntity
def dbg_st_search(uri, union, varmap, args, cachekey=None, prefix='rql for'):
if server.DEBUG & server.DBG_RQL:
print ' %s %s source: %s' % (prefix, uri, repr(union.as_string()))
if varmap:
print ' using varmap', varmap
if server.DEBUG & server.DBG_MORE:
print ' args', repr(args)
print ' cache key', cachekey
print ' solutions', ','.join(str(s.solutions)
for s in union.children)
# return true so it can be used as assertion (and so be killed by python -O)
return True
def dbg_results(results):
if server.DEBUG & server.DBG_RQL:
if len(results) > 10:
print ' -->', results[:10], '...', len(results)
else:
print ' -->', results
# return true so it can be used as assertion (and so be killed by python -O)
return True
class TimedCache(dict):
def __init__(self, ttl):
# time to live in seconds
if ttl <= 0:
raise ValueError('TimedCache initialized with a ttl of %ss' % ttl.seconds)
self.ttl = timedelta(seconds=ttl)
def __setitem__(self, key, value):
dict.__setitem__(self, key, (datetime.utcnow(), value))
def __getitem__(self, key):
return dict.__getitem__(self, key)[1]
def clear_expired(self):
now_ = datetime.utcnow()
ttl = self.ttl
for key, (timestamp, value) in self.items():
if now_ - timestamp > ttl:
del self[key]
class AbstractSource(object):
"""an abstract class for sources"""
# does the source copy data into the system source, or is it a *true* source
# (i.e. entities are not stored physically here)
copy_based_source = False
# boolean telling if modification hooks should be called when something is
# modified in this source
should_call_hooks = True
# boolean telling if the repository should connect to this source during
# migration
connect_for_migration = True
# mappings telling which entities and relations are available in the source
# keys are supported entity/relation types and values are boolean indicating
# wether the support is read-only (False) or read-write (True)
support_entities = {}
support_relations = {}
# a global identifier for this source, which has to be set by the source
# instance
uri = None
# a reference to the system information helper
repo = None
# a reference to the instance'schema (may differs from the source'schema)
schema = None
# multi-sources planning control
dont_cross_relations = ()
cross_relations = ()
# force deactivation (configuration error for instance)
disabled = False
# boolean telling if cwuri of entities from this source is the url that
# should be used as entity's absolute url
use_cwuri_as_url = False
# source configuration options
options = ()
# these are overridden by set_log_methods below
# only defining here to prevent pylint from complaining
info = warning = error = critical = exception = debug = lambda msg,*a,**kw: None
def __init__(self, repo, source_config, eid=None):
self.repo = repo
self.set_schema(repo.schema)
self.support_relations['identity'] = False
self.eid = eid
self.public_config = source_config.copy()
self.public_config.setdefault('use-cwuri-as-url', self.use_cwuri_as_url)
self.remove_sensitive_information(self.public_config)
self.uri = source_config.pop('uri')
set_log_methods(self, getLogger('cubicweb.sources.'+self.uri))
source_config.pop('type')
def __repr__(self):
return '<%s %s source %s @%#x>' % (self.uri, self.__class__.__name__,
self.eid, id(self))
def __cmp__(self, other):
"""simple comparison function to get predictable source order, with the
system source at last
"""
if self.uri == other.uri:
return 0
if self.uri == 'system':
return 1
if other.uri == 'system':
return -1
return cmp(self.uri, other.uri)
def backup(self, backupfile, confirm, format='native'):
"""method called to create a backup of source's data"""
pass
def restore(self, backupfile, confirm, drop, format='native'):
"""method called to restore a backup of source's data"""
pass
@classmethod
def check_conf_dict(cls, eid, confdict, _=unicode, fail_if_unknown=True):
"""check configuration of source entity. Return config dict properly
typed with defaults set.
"""
processed = {}
for optname, optdict in cls.options:
value = confdict.pop(optname, optdict.get('default'))
if value is configuration.REQUIRED:
if not fail_if_unknown:
continue
msg = _('specifying %s is mandatory' % optname)
raise ValidationError(eid, {role_name('config', 'subject'): msg})
elif value is not None:
# type check
try:
value = configuration.convert(value, optdict, optname)
except Exception, ex:
msg = unicode(ex) # XXX internationalization
raise ValidationError(eid, {role_name('config', 'subject'): msg})
processed[optname] = value
# cw < 3.10 bw compat
try:
processed['adapter'] = confdict['adapter']
except KeyError:
pass
# check for unknown options
if confdict and not confdict.keys() == ['adapter']:
if fail_if_unknown:
msg = _('unknown options %s') % ', '.join(confdict)
raise ValidationError(eid, {role_name('config', 'subject'): msg})
else:
logger = getLogger('cubicweb.sources')
logger.warning('unknown options %s', ', '.join(confdict))
# add options to processed, they may be necessary during migration
processed.update(confdict)
return processed
@classmethod
def check_config(cls, source_entity):
"""check configuration of source entity"""
return cls.check_conf_dict(source_entity.eid, source_entity.host_config,
_=source_entity._cw._)
def update_config(self, source_entity, typedconfig):
"""update configuration from source entity. `typedconfig` is config
properly typed with defaults set
"""
pass
# source initialization / finalization #####################################
def set_schema(self, schema):
"""set the instance'schema"""
self.schema = schema
def init_creating(self):
"""method called by the repository once ready to create a new instance"""
pass
def init(self, activated, source_entity):
"""method called by the repository once ready to handle request.
`activated` is a boolean flag telling if the source is activated or not.
"""
pass
PUBLIC_KEYS = ('type', 'uri', 'use-cwuri-as-url')
def remove_sensitive_information(self, sourcedef):
"""remove sensitive information such as login / password from source
definition
"""
for key in sourcedef.keys():
if not key in self.PUBLIC_KEYS:
sourcedef.pop(key)
# connections handling #####################################################
def get_connection(self):
"""open and return a connection to the source"""
raise NotImplementedError(self)
def check_connection(self, cnx):
"""Check connection validity, return None if the connection is still
valid else a new connection (called when the connections set using the
given connection is being attached to a session). Do nothing by default.
"""
pass
def close_source_connections(self):
for cnxset in self.repo.cnxsets:
cnxset._cursors.pop(self.uri, None)
cnxset.source_cnxs[self.uri][1].close()
def open_source_connections(self):
for cnxset in self.repo.cnxsets:
cnxset.source_cnxs[self.uri] = (self, self.get_connection())
def cnxset_freed(self, cnx):
"""the connections set holding the given connection is being reseted
from its current attached session.
do nothing by default
"""
pass
# cache handling ###########################################################
def reset_caches(self):
"""method called during test to reset potential source caches"""
pass
def clear_eid_cache(self, eid, etype):
"""clear potential caches for the given eid"""
pass
# external source api ######################################################
def support_entity(self, etype, write=False):
"""return true if the given entity's type is handled by this adapter
if write is true, return true only if it's a RW support
"""
try:
wsupport = self.support_entities[etype]
except KeyError:
return False
if write:
return wsupport
return True
def support_relation(self, rtype, write=False):
"""return true if the given relation's type is handled by this adapter
if write is true, return true only if it's a RW support
current implementation return true if the relation is defined into
`support_relations` or if it is a final relation of a supported entity
type
"""
try:
wsupport = self.support_relations[rtype]
except KeyError:
rschema = self.schema.rschema(rtype)
if not rschema.final or rschema.type == 'has_text':
return False
for etype in rschema.subjects():
try:
wsupport = self.support_entities[etype]
break
except KeyError:
continue
else:
return False
if write:
return wsupport
return True
def may_cross_relation(self, rtype):
"""return True if the relation may be crossed among sources. Rules are:
* if this source support the relation, can't be crossed unless explicitly
specified in .cross_relations
* if this source doesn't support the relation, can be crossed unless
explicitly specified in .dont_cross_relations
"""
# XXX find a way to have relation such as state_of in dont cross
# relation (eg composite relation without both end type available?
# card 1 relation ? ...)
if self.support_relation(rtype):
return rtype in self.cross_relations
return rtype not in self.dont_cross_relations
def before_entity_insertion(self, session, lid, etype, eid, sourceparams):
"""called by the repository when an eid has been attributed for an
entity stored here but the entity has not been inserted in the system
table yet.
This method must return the an Entity instance representation of this
entity.
"""
entity = self.repo.vreg['etypes'].etype_class(etype)(session)
entity.eid = eid
entity.cw_edited = EditedEntity(entity)
return entity
def after_entity_insertion(self, session, lid, entity, sourceparams):
"""called by the repository after an entity stored here has been
inserted in the system table.
"""
pass
def _load_mapping(self, session=None, **kwargs):
if not 'CWSourceSchemaConfig' in self.schema:
self.warning('instance is not mapping ready')
return
if session is None:
_session = self.repo.internal_session()
else:
_session = session
try:
for schemacfg in _session.execute(
'Any CFG,CFGO,S WHERE '
'CFG options CFGO, CFG cw_schema S, '
'CFG cw_for_source X, X eid %(x)s', {'x': self.eid}).entities():
self.add_schema_config(schemacfg, **kwargs)
finally:
if session is None:
_session.close()
def add_schema_config(self, schemacfg, checkonly=False):
"""added CWSourceSchemaConfig, modify mapping accordingly"""
msg = schemacfg._cw._("this source doesn't use a mapping")
raise ValidationError(schemacfg.eid, {None: msg})
def del_schema_config(self, schemacfg, checkonly=False):
"""deleted CWSourceSchemaConfig, modify mapping accordingly"""
msg = schemacfg._cw._("this source doesn't use a mapping")
raise ValidationError(schemacfg.eid, {None: msg})
def update_schema_config(self, schemacfg, checkonly=False):
"""updated CWSourceSchemaConfig, modify mapping accordingly"""
self.del_schema_config(schemacfg, checkonly)
self.add_schema_config(schemacfg, checkonly)
# user authentication api ##################################################
def authenticate(self, session, login, **kwargs):
"""if the source support CWUser entity type, it should implement
this method which should return CWUser eid for the given login/password
if this account is defined in this source and valid login / password is
given. Else raise `AuthenticationError`
"""
raise NotImplementedError(self)
# RQL query api ############################################################
def syntax_tree_search(self, session, union,
args=None, cachekey=None, varmap=None, debug=0):
"""return result from this source for a rql query (actually from a rql
syntax tree and a solution dictionary mapping each used variable to a
possible type). If cachekey is given, the query necessary to fetch the
results (but not the results themselves) may be cached using this key.
"""
raise NotImplementedError(self)
def flying_insert(self, table, session, union, args=None, varmap=None):
"""similar as .syntax_tree_search, but inserts data in the temporary
table (on-the-fly if possible, eg for the system source whose the given
cursor come from). If not possible, inserts all data by calling
.executemany().
"""
res = self.syntax_tree_search(session, union, args, varmap=varmap)
session.cnxset.source('system').manual_insert(res, table, session)
# write modification api ###################################################
# read-only sources don't have to implement methods below
def get_extid(self, entity):
"""return the external id for the given newly inserted entity"""
raise NotImplementedError(self)
def add_entity(self, session, entity):
"""add a new entity to the source"""
raise NotImplementedError(self)
def update_entity(self, session, entity):
"""update an entity in the source"""
raise NotImplementedError(self)
def delete_entities(self, session, entities):
"""delete several entities from the source"""
for entity in entities:
self.delete_entity(session, entity)
def delete_entity(self, session, entity):
"""delete an entity from the source"""
raise NotImplementedError(self)
def add_relation(self, session, subject, rtype, object):
"""add a relation to the source"""
raise NotImplementedError(self)
def add_relations(self, session, rtype, subj_obj_list):
"""add a relations to the source"""
# override in derived classes if you feel you can
# optimize
for subject, object in subj_obj_list:
self.add_relation(session, subject, rtype, object)
def delete_relation(self, session, subject, rtype, object):
"""delete a relation from the source"""
raise NotImplementedError(self)
# system source interface #################################################
def eid_type_source(self, session, eid):
"""return a tuple (type, source, extid) for the entity with id <eid>"""
raise NotImplementedError(self)
def create_eid(self, session):
raise NotImplementedError(self)
def add_info(self, session, entity, source, extid):
"""add type and source info for an eid into the system table"""
raise NotImplementedError(self)
def update_info(self, session, entity, need_fti_update):
"""mark entity as being modified, fulltext reindex if needed"""
raise NotImplementedError(self)
def delete_info_multi(self, session, entities, uri):
"""delete system information on deletion of a list of entities with the
same etype and belinging to the same source
"""
raise NotImplementedError(self)
def modified_entities(self, session, etypes, mtime):
"""return a 2-uple:
* list of (etype, eid) of entities of the given types which have been
modified since the given timestamp (actually entities whose full text
index content has changed)
* list of (etype, eid) of entities of the given types which have been
deleted since the given timestamp
"""
raise NotImplementedError(self)
def index_entity(self, session, entity):
"""create an operation to [re]index textual content of the given entity
on commit
"""
raise NotImplementedError(self)
def fti_unindex_entities(self, session, entities):
"""remove text content for entities from the full text index
"""
raise NotImplementedError(self)
def fti_index_entities(self, session, entities):
"""add text content of created/modified entities to the full text index
"""
raise NotImplementedError(self)
# sql system source interface #############################################
def sqlexec(self, session, sql, args=None):
"""execute the query and return its result"""
raise NotImplementedError(self)
def temp_table_def(self, selection, solution, table, basemap):
raise NotImplementedError(self)
def create_index(self, session, table, column, unique=False):
raise NotImplementedError(self)
def drop_index(self, session, table, column, unique=False):
raise NotImplementedError(self)
def create_temp_table(self, session, table, schema):
raise NotImplementedError(self)
def clean_temp_data(self, session, temptables):
"""remove temporary data, usually associated to temporary tables"""
pass
@deprecated('[3.13] use repo.eid2extid(source, eid, session)')
def eid2extid(self, eid, session=None):
return self.repo.eid2extid(self, eid, session)
@deprecated('[3.13] use extid2eid(source, value, etype, session, **kwargs)')
def extid2eid(self, value, etype, session=None, **kwargs):
return self.repo.extid2eid(self, value, etype, session, **kwargs)
class TrFunc(object):
"""lower, upper"""
def __init__(self, trname, index, attrname=None):
self._tr = trname.lower()
self.index = index
self.attrname = attrname
def apply(self, resdict):
value = resdict.get(self.attrname)
if value is not None:
return getattr(value, self._tr)()
return None
class GlobTrFunc(TrFunc):
"""count, sum, max, min, avg"""
funcs = {
'count': len,
'sum': sum,
'max': max,
'min': min,
# XXX avg
}
def apply(self, result):
"""have to 'groupby' manually. For instance, if we 'count' for index 1:
>>> self.apply([(1, 2), (3, 4), (1, 5)])
[(1, 7), (3, 4)]
"""
keys, values = [], {}
for row in result:
key = tuple(v for i, v in enumerate(row) if i != self.index)
value = row[self.index]
try:
values[key].append(value)
except KeyError:
keys.append(key)
values[key] = [value]
result = []
trfunc = self.funcs[self._tr]
for key in keys:
row = list(key)
row.insert(self.index, trfunc(values[key]))
result.append(row)
return result
class ConnectionWrapper(object):
def __init__(self, cnx=None):
self.cnx = cnx
def commit(self):
pass
def rollback(self):
pass
def cursor(self):
return None # no actual cursor support
def close(self):
if hasattr(self.cnx, 'close'):
self.cnx.close()
from cubicweb.server import SOURCE_TYPES
def source_adapter(source_type):
try:
return SOURCE_TYPES[source_type]
except KeyError:
raise RuntimeError('Unknown source type %r' % source_type)
def get_source(type, source_config, repo, eid):
"""return a source adapter according to the adapter field in the source's
configuration
"""
return source_adapter(type)(repo, source_config, eid)