"""Defines the central class for the CubicWeb RQL server: the repository.
The repository is an abstraction allowing execution of rql queries against
data sources. Most of the work is actually done in helper classes. The
repository mainly:
* brings these classes all together to provide a single access
point to a cubicweb application.
* handles session management
* provides method for pyro registration, to call if pyro is enabled
:organization: Logilab
:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
"""
__docformat__ = "restructuredtext en"
import sys
import Queue
from os.path import join, exists
from time import time, localtime, strftime
from mx.DateTime import now
from logilab.common.decorators import cached
from yams import BadSchemaDefinition
from rql import RQLSyntaxError
from cubicweb import (CW_SOFTWARE_ROOT, UnknownEid, AuthenticationError,
ETypeNotSupportedBySources, RTypeNotSupportedBySources,
BadConnectionId, Unauthorized, ValidationError,
ExecutionError, typed_eid,
CW_MIGRATION_MAP)
from cubicweb.cwvreg import CubicWebRegistry
from cubicweb.schema import CubicWebSchema
from cubicweb.server.utils import RepoThread, LoopTask
from cubicweb.server.pool import ConnectionsPool, LateOperation, SingleLastOperation
from cubicweb.server.session import Session, InternalSession
from cubicweb.server.querier import QuerierHelper
from cubicweb.server.sources import get_source
from cubicweb.server.hooksmanager import HooksManager
from cubicweb.server.hookhelper import rproperty
class CleanupEidTypeCacheOp(SingleLastOperation):
"""on rollback of a insert query or commit of delete query, we have to
clear repository's cache from no more valid entries
NOTE: querier's rqlst/solutions cache may have been polluted too with
queries such as Any X WHERE X eid 32 if 32 has been rollbacked however
generated queries are unpredictable and analysing all the cache probably
too expensive. Notice that there is no pb when using args to specify eids
instead of giving them into the rql string.
"""
def commit_event(self):
"""the observed connections pool has been rollbacked,
remove inserted eid from repository type/source cache
"""
self.repo.clear_caches(self.session.query_data('pendingeids', ()))
def rollback_event(self):
"""the observed connections pool has been rollbacked,
remove inserted eid from repository type/source cache
"""
self.repo.clear_caches(self.session.query_data('neweids', ()))
class FTIndexEntityOp(LateOperation):
"""operation to delay entity full text indexation to commit
since fti indexing may trigger discovery of other entities, it should be
triggered on precommit, not commit, and this should be done after other
precommit operation which may add relations to the entity
"""
def precommit_event(self):
session = self.session
entity = self.entity
if entity.eid in session.query_data('pendingeids', ()):
return # entity added and deleted in the same transaction
session.repo.system_source.fti_unindex_entity(session, entity.eid)
for container in entity.fti_containers():
session.repo.index_entity(session, container)
def commit_event(self):
pass
def del_existing_rel_if_needed(session, eidfrom, rtype, eidto):
"""delete existing relation when adding a new one if card is 1 or ?
have to be done once the new relation has been inserted to avoid having
an entity without a relation for some time
this kind of behaviour has to be done in the repository so we don't have
hooks order hazardness
"""
# skip delete queries (only?) if session is an internal session. This is
# hooks responsability to ensure they do not violate relation's cardinality
if session.is_super_session:
return
card = rproperty(session, rtype, eidfrom, eidto, 'cardinality')
# one may be tented to check for neweids but this may cause more than one
# relation even with '1?' cardinality if thoses relations are added in the
# same transaction where the entity is being created. This never occurs from
# the web interface but may occurs during test or dbapi connection (though
# not expected for this). So: don't do it, we pretend to ensure repository
# consistency.
# XXX should probably not use unsafe_execute!
if card[0] in '1?':
rschema = session.repo.schema.rschema(rtype)
if not rschema.inlined:
session.unsafe_execute('DELETE X %s Y WHERE X eid %%(x)s, NOT Y eid %%(y)s' % rtype,
{'x': eidfrom, 'y': eidto}, 'x')
if card[1] in '1?':
session.unsafe_execute('DELETE X %s Y WHERE NOT X eid %%(x)s, Y eid %%(y)s' % rtype,
{'x': eidfrom, 'y': eidto}, 'y')
class Repository(object):
"""a repository provides access to a set of persistent storages for
entities and relations
XXX protect pyro access
"""
def __init__(self, config, vreg=None, debug=False):
self.config = config
if vreg is None:
vreg = CubicWebRegistry(config, debug)
self.vreg = vreg
self.pyro_registered = False
self.info('starting repository from %s', self.config.apphome)
# dictionary of opened sessions
self._sessions = {}
# list of functions to be called at regular interval
self._looping_tasks = []
# list of running threads
self._running_threads = []
# initial schema, should be build or replaced latter
self.schema = CubicWebSchema(config.appid)
# querier helper, need to be created after sources initialization
self.querier = QuerierHelper(self, self.schema)
# sources
self.sources = []
self.sources_by_uri = {}
# FIXME: store additional sources info in the system database ?
# FIXME: sources should be ordered (add_entity priority)
for uri, source_config in config.sources().items():
if uri == 'admin':
# not an actual source
continue
source = self.get_source(uri, source_config)
self.sources_by_uri[uri] = source
self.sources.append(source)
self.system_source = self.sources_by_uri['system']
# ensure system source is the first one
self.sources.remove(self.system_source)
self.sources.insert(0, self.system_source)
# cache eid -> type / source
self._type_source_cache = {}
# cache (extid, source uri) -> eid
self._extid_cache = {}
# create the hooks manager
self.hm = HooksManager(self.schema)
# open some connections pools
self._available_pools = Queue.Queue()
self._available_pools.put_nowait(ConnectionsPool(self.sources))
if config.read_application_schema:
# normal start: load the application schema from the database
self.fill_schema()
elif config.bootstrap_schema:
# usually during repository creation
self.warning("set fs application'schema as bootstrap schema")
config.bootstrap_cubes()
self.set_bootstrap_schema(self.config.load_schema())
# need to load the Any and EUser entity types
self.vreg.schema = self.schema
etdirectory = join(CW_SOFTWARE_ROOT, 'entities')
self.vreg.load_file(etdirectory, '__init__.py')
self.vreg.load_file(etdirectory, 'authobjs.py')
else:
# test start: use the file system schema (quicker)
self.warning("set fs application'schema")
config.bootstrap_cubes()
self.set_schema(self.config.load_schema())
if not config.creating:
if 'EProperty' in self.schema:
self.vreg.init_properties(self.properties())
# call source's init method to complete their initialisation if
# needed (for instance looking for persistent configuration using an
# internal session, which is not possible until pools have been
# initialized)
for source in self.sources:
source.init()
# call application level initialisation hooks
self.hm.call_hooks('server_startup', repo=self)
# register a task to cleanup expired session
self.looping_task(self.config['session-time']/3.,
self.clean_sessions)
else:
# call init_creating so for instance native source can configurate
# tsearch according to postgres version
for source in self.sources:
source.init_creating()
# close initialization pool and reopen fresh ones for proper
# initialization now that we know cubes
self._get_pool().close(True)
for i in xrange(config['connections-pool-size']):
self._available_pools.put_nowait(ConnectionsPool(self.sources))
# internals ###############################################################
def get_source(self, uri, source_config):
source_config['uri'] = uri
return get_source(source_config, self.schema, self)
def set_schema(self, schema, resetvreg=True):
schema.rebuild_infered_relations()
self.info('set schema %s %#x', schema.name, id(schema))
self.debug(', '.join(sorted(str(e) for e in schema.entities())))
self.querier.set_schema(schema)
for source in self.sources:
source.set_schema(schema)
self.schema = schema
if resetvreg:
# full reload of all appobjects
self.vreg.reset()
self.vreg.set_schema(schema)
self.hm.set_schema(schema)
self.hm.register_system_hooks(self.config)
# application specific hooks
if self.config.application_hooks:
self.info('loading application hooks')
self.hm.register_hooks(self.config.load_hooks(self.vreg))
def fill_schema(self):
"""lod schema from the repository"""
from cubicweb.server.schemaserial import deserialize_schema
self.info('loading schema from the repository')
appschema = CubicWebSchema(self.config.appid)
self.set_bootstrap_schema(self.config.load_bootstrap_schema())
self.debug('deserializing db schema into %s %#x', appschema.name, id(appschema))
session = self.internal_session()
try:
try:
deserialize_schema(appschema, session)
except BadSchemaDefinition:
raise
except Exception, ex:
raise Exception('Is the database initialised ? (cause: %s)' %
(ex.args and ex.args[0].strip() or 'unknown')), \
None, sys.exc_info()[-1]
self.info('set the actual schema')
# XXX have to do this since EProperty isn't in the bootstrap schema
# it'll be redone in set_schema
self.set_bootstrap_schema(appschema)
# 2.49 migration
if exists(join(self.config.apphome, 'vc.conf')):
session.set_pool()
if not 'template' in file(join(self.config.apphome, 'vc.conf')).read():
# remaning from cubicweb < 2.38...
session.execute('DELETE EProperty X WHERE X pkey "system.version.template"')
session.commit()
finally:
session.close()
self.config.init_cubes(self.get_cubes())
self.set_schema(appschema)
def set_bootstrap_schema(self, schema):
"""disable hooks when setting a bootstrap schema, but restore
the configuration for the next time
"""
config = self.config
# XXX refactor
config.core_hooks = False
config.usergroup_hooks = False
config.schema_hooks = False
config.notification_hooks = False
config.application_hooks = False
self.set_schema(schema, resetvreg=False)
config.core_hooks = True
config.usergroup_hooks = True
config.schema_hooks = True
config.notification_hooks = True
config.application_hooks = True
def start_looping_tasks(self):
assert isinstance(self._looping_tasks, list), 'already started'
for i, (interval, func) in enumerate(self._looping_tasks):
self._looping_tasks[i] = task = LoopTask(interval, func)
self.info('starting task %s with interval %.2fs', task.name,
interval)
task.start()
# ensure no tasks will be further added
self._looping_tasks = tuple(self._looping_tasks)
def looping_task(self, interval, func):
"""register a function to be called every `interval` seconds.
looping tasks can only be registered during repository initialization,
once done this method will fail.
"""
try:
self._looping_tasks.append( (interval, func) )
except AttributeError:
raise RuntimeError("can't add looping task once the repository is started")
def threaded_task(self, func):
"""start function in a separated thread"""
t = RepoThread(func, self._running_threads)
t.start()
#@locked
def _get_pool(self):
try:
return self._available_pools.get(True, timeout=5)
except Queue.Empty:
raise Exception('no pool available after 5 secs, probably either a '
'bug in code (to many uncommited/rollbacked '
'connections) or to much load on the server (in '
'which case you can try to set a bigger '
'connections pools size)')
def _free_pool(self, pool):
pool.rollback()
self._available_pools.put_nowait(pool)
def pinfo(self):
# XXX: session.pool is accessed from a local storage, would be interesting
# to see if there is a pool set in any thread specific data)
import threading
return '%s: %s (%s)' % (self._available_pools.qsize(),
','.join(session.user.login for session in self._sessions.values()
if session.pool),
threading.currentThread())
def shutdown(self):
"""called on server stop event to properly close opened sessions and
connections
"""
if isinstance(self._looping_tasks, tuple): # if tasks have been started
for looptask in self._looping_tasks:
self.info('canceling task %s...', looptask.name)
looptask.cancel()
looptask.join()
self.info('task %s finished', looptask.name)
for thread in self._running_threads:
self.info('waiting thread %s...', thread.name)
thread.join()
self.info('thread %s finished', thread.name)
self.hm.call_hooks('server_shutdown', repo=self)
self.close_sessions()
while not self._available_pools.empty():
pool = self._available_pools.get_nowait()
try:
pool.close(True)
except:
self.exception('error while closing %s' % pool)
continue
if self.pyro_registered:
pyro_unregister(self.config)
hits, misses = self.querier.cache_hit, self.querier.cache_miss
try:
self.info('rqlt st cache hit/miss: %s/%s (%s%% hits)', hits, misses,
(hits * 100) / (hits + misses))
hits, misses = self.system_source.cache_hit, self.system_source.cache_miss
self.info('sql cache hit/miss: %s/%s (%s%% hits)', hits, misses,
(hits * 100) / (hits + misses))
nocache = self.system_source.no_cache
self.info('sql cache usage: %s/%s (%s%%)', hits+ misses, nocache,
((hits + misses) * 100) / (hits + misses + nocache))
except ZeroDivisionError:
pass
def authenticate_user(self, session, login, password):
"""validate login / password, raise AuthenticationError on failure
return associated EUser instance on success
"""
for source in self.sources:
if source.support_entity('EUser'):
try:
eid = source.authenticate(session, login, password)
break
except AuthenticationError:
continue
else:
raise AuthenticationError('authentication failed with all sources')
euser = self._build_user(session, eid)
if self.config.consider_user_state and \
not euser.state in euser.AUTHENTICABLE_STATES:
raise AuthenticationError('user is not in authenticable state')
return euser
def _build_user(self, session, eid):
cls = self.vreg.etype_class('EUser')
rql = cls.fetch_rql(session.user, ['X eid %(x)s'])
rset = session.execute(rql, {'x': eid}, 'x')
assert len(rset) == 1, rset
euser = rset.get_entity(0, 0)
# prefetch / cache euser's groups and properties. This is especially
# useful for internal sessions to avoid security insertions
euser.groups
euser.properties
return euser
# public (dbapi) interface ################################################
def get_schema(self):
"""return the application schema. This is a public method, not
requiring a session id
"""
try:
# necessary to support pickling used by pyro
self.schema.__hashmode__ = 'pickle'
return self.schema
finally:
self.schema.__hashmode__ = None
def get_cubes(self):
"""return the list of cubes used by this application. This is a
public method, not requiring a session id.
"""
versions = self.get_versions(not self.config.creating)
cubes = list(versions)
cubes.remove('cubicweb')
return cubes
@cached
def get_versions(self, checkversions=False):
"""return the a dictionary containing cubes used by this application
as key with their version as value, including cubicweb version. This is a
public method, not requiring a session id.
"""
from logilab.common.changelog import Version
vcconf = {}
session = self.internal_session()
try:
for pk, version in session.execute(
'Any K,V WHERE P is EProperty, P value V, P pkey K, '
'P pkey ~="system.version.%"', build_descr=False):
cube = pk.split('.')[-1]
# XXX cubicweb migration
if cube in CW_MIGRATION_MAP:
cube = CW_MIGRATION_MAP[cube]
version = Version(version)
vcconf[cube] = version
if checkversions:
if cube != 'cubicweb':
fsversion = self.config.cube_version(cube)
else:
fsversion = self.config.cubicweb_version()
if version < fsversion:
msg = ('application has %s version %s but %s '
'is installed. Run "cubicweb-ctl upgrade".')
raise ExecutionError(msg % (cube, version, fsversion))
finally:
session.close()
return vcconf
@cached
def source_defs(self):
sources = self.config.sources().copy()
# remove manager information
sources.pop('admin', None)
# remove sensitive information
for uri, sourcedef in sources.iteritems():
sourcedef = sourcedef.copy()
self.sources_by_uri[uri].remove_sensitive_information(sourcedef)
sources[uri] = sourcedef
return sources
def properties(self):
"""return a result set containing system wide properties"""
session = self.internal_session()
try:
return session.execute('Any K,V WHERE P is EProperty,'
'P pkey K, P value V, NOT P for_user U',
build_descr=False)
finally:
session.close()
def register_user(self, login, password, **kwargs):
"""check a user with the given login exists, if not create it with the
given password. This method is designed to be used for anonymous
registration on public web site.
"""
session = self.internal_session()
try:
if session.execute('EUser X WHERE X login %(login)s', {'login': login}):
return False
# we have to create the user
user = self.vreg.etype_class('EUser')(session, None)
if isinstance(password, unicode):
# password should *always* be utf8 encoded
password = password.encode('UTF8')
kwargs['login'] = login
kwargs['upassword'] = password
user.update(kwargs)
self.glob_add_entity(session, user)
session.execute('SET X in_group G WHERE X eid %(x)s, G name "users"',
{'x': user.eid})
session.commit()
finally:
session.close()
return True
def connect(self, login, password, cnxprops=None):
"""open a connection for a given user
base_url may be needed to send mails
cnxtype indicate if this is a pyro connection or a in-memory connection
raise `AuthenticationError` if the authentication failed
raise `ConnectionError` if we can't open a connection
"""
# use an internal connection
session = self.internal_session()
# try to get a user object
try:
user = self.authenticate_user(session, login, password)
finally:
session.close()
session = Session(user, self, cnxprops)
user.req = user.rset.req = session
user.clear_related_cache()
self._sessions[session.id] = session
self.info('opened %s', session)
self.hm.call_hooks('session_open', session=session)
# commit session at this point in case write operation has been done
# during `session_open` hooks
session.commit()
return session.id
def execute(self, sessionid, rqlstring, args=None, eid_key=None, build_descr=True):
"""execute a RQL query
* rqlstring should be an unicode string or a plain ascii string
* args the optional parameters used in the query
* build_descr is a flag indicating if the description should be
built on select queries
"""
session = self._get_session(sessionid, setpool=True)
try:
try:
return self.querier.execute(session, rqlstring, args, eid_key,
build_descr)
except (Unauthorized, RQLSyntaxError):
raise
except ValidationError, ex:
# need ValidationError normalization here so error may pass
# through pyro
if hasattr(ex.entity, 'eid'):
ex.entity = ex.entity.eid # error raised by yams
args = list(ex.args)
args[0] = ex.entity
ex.args = tuple(args)
raise
except:
# FIXME: check error to catch internal errors
self.exception('unexpected error')
raise
finally:
session.reset_pool()
def describe(self, sessionid, eid):
"""return a tuple (type, source, extid) for the entity with id <eid>"""
session = self._get_session(sessionid, setpool=True)
try:
return self.type_and_source_from_eid(eid, session)
finally:
session.reset_pool()
def check_session(self, sessionid):
"""raise `BadSessionId` if the connection is no more valid"""
self._get_session(sessionid, setpool=False)
def get_shared_data(self, sessionid, key, default=None, pop=False):
"""return the session's data dictionary"""
session = self._get_session(sessionid, setpool=False)
return session.get_shared_data(key, default, pop)
def set_shared_data(self, sessionid, key, value, querydata=False):
"""set value associated to `key` in shared data
if `querydata` is true, the value will be added to the repository
session's query data which are cleared on commit/rollback of the current
transaction, and won't be available through the connexion, only on the
repository side.
"""
session = self._get_session(sessionid, setpool=False)
session.set_shared_data(key, value, querydata)
def commit(self, sessionid):
"""commit transaction for the session with the given id"""
self.debug('begin commit for session %s', sessionid)
try:
self._get_session(sessionid, setpool=True).commit()
except (ValidationError, Unauthorized):
raise
except:
self.exception('unexpected error')
raise
def rollback(self, sessionid):
"""commit transaction for the session with the given id"""
self.debug('begin rollback for session %s', sessionid)
try:
self._get_session(sessionid, setpool=True).rollback()
except:
self.exception('unexpected error')
raise
def close(self, sessionid):
"""close the session with the given id"""
session = self._get_session(sessionid, setpool=True)
# operation uncommited before close are rollbacked before hook is called
session.rollback()
self.hm.call_hooks('session_close', session=session)
# commit session at this point in case write operation has been done
# during `session_close` hooks
session.commit()
session.close()
del self._sessions[sessionid]
self.info('closed session %s for user %s', sessionid, session.user.login)
def user_info(self, sessionid, props=None):
"""this method should be used by client to:
* check session id validity
* update user information on each user's request (i.e. groups and
custom properties)
"""
session = self._get_session(sessionid, setpool=False)
if props:
# update session properties
for prop, value in props.items():
session.change_property(prop, value)
user = session.user
return user.eid, user.login, user.groups, user.properties
# public (inter-repository) interface #####################################
def entities_modified_since(self, etypes, mtime):
"""function designed to be called from an external repository which
is using this one as a rql source for synchronization, and return a
3-uple containing :
* the local date
* 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
"""
session = self.internal_session()
updatetime = now()
try:
modentities, delentities = self.system_source.modified_entities(
session, etypes, mtime)
return updatetime, modentities, delentities
finally:
session.close()
# session handling ########################################################
def close_sessions(self):
"""close every opened sessions"""
for sessionid in self._sessions.keys():
try:
self.close(sessionid)
except:
self.exception('error while closing session %s' % sessionid)
def clean_sessions(self):
"""close sessions not used since an amount of time specified in the
configuration
"""
mintime = time() - self.config['session-time']
self.debug('cleaning session unused since %s',
strftime('%T', localtime(mintime)))
nbclosed = 0
for session in self._sessions.values():
if session.timestamp < mintime:
self.close(session.id)
nbclosed += 1
return nbclosed
def internal_session(self, cnxprops=None):
"""return a dbapi like connection/cursor using internal user which
have every rights on the repository. You'll *have to* commit/rollback
or close (rollback implicitly) the session once the job's done, else
you'll leak connections pool up to the time where no more pool is
available, causing irremediable freeze...
"""
session = InternalSession(self, cnxprops)
session.set_pool()
return session
def _get_session(self, sessionid, setpool=False):
"""return the user associated to the given session identifier"""
try:
session = self._sessions[sessionid]
except KeyError:
raise BadConnectionId('No such session %s' % sessionid)
if setpool:
session.set_pool()
return session
# data sources handling ###################################################
# * correspondance between eid and (type, source)
# * correspondance between eid and local id (i.e. specific to a given source)
# * searchable text indexes
def type_and_source_from_eid(self, eid, session=None):
"""return a tuple (type, source, extid) for the entity with id <eid>"""
try:
eid = typed_eid(eid)
except ValueError:
raise UnknownEid(eid)
try:
return self._type_source_cache[eid]
except KeyError:
if session is None:
session = self.internal_session()
reset_pool = True
else:
reset_pool = False
try:
etype, uri, extid = self.system_source.eid_type_source(session,
eid)
finally:
if reset_pool:
session.reset_pool()
self._type_source_cache[eid] = (etype, uri, extid)
if uri != 'system':
self._extid_cache[(extid, uri)] = eid
return etype, uri, extid
def clear_caches(self, eids):
etcache = self._type_source_cache
extidcache = self._extid_cache
rqlcache = self.querier._rql_cache
for eid in eids:
try:
etype, uri, extid = etcache.pop(typed_eid(eid)) # may be a string in some cases
rqlcache.pop('%s X WHERE X eid %s' % (etype, eid), None)
extidcache.pop((extid, uri), None)
except KeyError:
etype = None
rqlcache.pop('Any X WHERE X eid %s' % eid, None)
for source in self.sources:
source.clear_eid_cache(eid, etype)
def type_from_eid(self, eid, session=None):
"""return the type of the entity with id <eid>"""
return self.type_and_source_from_eid(eid, session)[0]
def source_from_eid(self, eid, session=None):
"""return the source for the given entity's eid"""
return self.sources_by_uri[self.type_and_source_from_eid(eid, session)[1]]
def eid2extid(self, source, eid, session=None):
"""get local id from an eid"""
etype, uri, extid = self.type_and_source_from_eid(eid, session)
if source.uri != uri:
# eid not from the given source
raise UnknownEid(eid)
return extid
def extid2eid(self, source, lid, etype, session=None, insert=True):
"""get eid from a local id. An eid is attributed if no record is found"""
cachekey = (str(lid), source.uri)
try:
return self._extid_cache[cachekey]
except KeyError:
pass
reset_pool = False
if session is None:
session = self.internal_session()
reset_pool = True
eid = self.system_source.extid2eid(session, source, lid)
if eid is not None:
self._extid_cache[cachekey] = eid
self._type_source_cache[eid] = (etype, source.uri, lid)
if reset_pool:
session.reset_pool()
return eid
if not insert:
return
# no link between lid and eid, create one using an internal session
# since the current session user may not have required permissions to
# do necessary stuff and we don't want to commit user session.
#
# Moreover, even if session is already an internal session but is
# processing a commit, we have to use another one
if not session.is_internal_session:
session = self.internal_session()
reset_pool = True
try:
eid = self.system_source.create_eid(session)
self._extid_cache[cachekey] = eid
self._type_source_cache[eid] = (etype, source.uri, lid)
entity = source.before_entity_insertion(session, lid, etype, eid)
if source.should_call_hooks:
self.hm.call_hooks('before_add_entity', etype, session, entity)
# XXX call add_info with complete=False ?
self.add_info(session, entity, source, lid)
source.after_entity_insertion(session, lid, entity)
if source.should_call_hooks:
self.hm.call_hooks('after_add_entity', etype, session, entity)
else:
# minimal meta-data
session.execute('SET X is E WHERE X eid %(x)s, E name %(name)s',
{'x': entity.eid, 'name': entity.id}, 'x')
session.commit(reset_pool)
return eid
except:
session.rollback(reset_pool)
raise
def add_info(self, session, entity, source, extid=None, complete=True):
"""add type and source info for an eid into the system table,
and index the entity with the full text index
"""
# begin by inserting eid/type/source/extid into the entities table
self.system_source.add_info(session, entity, source, extid)
if complete:
entity.complete(entity.e_schema.indexable_attributes())
session.add_query_data('neweids', entity.eid)
# now we can update the full text index
FTIndexEntityOp(session, entity=entity)
CleanupEidTypeCacheOp(session)
def delete_info(self, session, eid):
self._prepare_delete_info(session, eid)
self._delete_info(session, eid)
def _prepare_delete_info(self, session, eid):
"""prepare the repository for deletion of an entity:
* update the fti
* mark eid as being deleted in session info
* setup cache update operation
"""
self.system_source.fti_unindex_entity(session, eid)
pending = session.query_data('pendingeids', set(), setdefault=True)
pending.add(eid)
CleanupEidTypeCacheOp(session)
def _delete_info(self, session, eid):
"""delete system information on deletion of an entity:
* delete all relations on this entity
* transfer record from the entities table to the deleted_entities table
"""
etype, uri, extid = self.type_and_source_from_eid(eid, session)
self._clear_eid_relations(session, etype, eid)
self.system_source.delete_info(session, eid, etype, uri, extid)
def _clear_eid_relations(self, session, etype, eid):
"""when a entity is deleted, build and execute rql query to delete all
its relations
"""
rql = []
eschema = self.schema.eschema(etype)
for rschema, targetschemas, x in eschema.relation_definitions():
rtype = rschema.type
if rtype == 'identity':
continue
var = '%s%s' % (rtype.upper(), x.upper())
if x == 'subject':
# don't skip inlined relation so they are regularly
# deleted and so hooks are correctly called
rql.append('X %s %s' % (rtype, var))
else:
rql.append('%s %s X' % (var, rtype))
rql = 'DELETE %s WHERE X eid %%(x)s' % ','.join(rql)
# unsafe_execute since we suppose that if user can delete the entity,
# he can delete all its relations without security checking
session.unsafe_execute(rql, {'x': eid}, 'x', build_descr=False)
def index_entity(self, session, entity):
"""full text index a modified entity"""
alreadydone = session.query_data('indexedeids', set(), setdefault=True)
if entity.eid in alreadydone:
self.info('skipping reindexation of %s, already done', entity.eid)
return
alreadydone.add(entity.eid)
self.system_source.fti_index_entity(session, entity)
def locate_relation_source(self, session, subject, rtype, object):
subjsource = self.source_from_eid(subject, session)
objsource = self.source_from_eid(object, session)
if not (subjsource is objsource and subjsource.support_relation(rtype, 1)):
source = self.system_source
if not source.support_relation(rtype, 1):
raise RTypeNotSupportedBySources(rtype)
else:
source = subjsource
return source
@cached
def rel_type_sources(self, rtype):
return [source for source in self.sources
if source.support_relation(rtype) or rtype in source.dont_cross_relations]
def locate_etype_source(self, etype):
for source in self.sources:
if source.support_entity(etype, 1):
return source
else:
raise ETypeNotSupportedBySources(etype)
def glob_add_entity(self, session, entity):
"""add an entity to the repository
the entity eid should originaly be None and a unique eid is assigned to
the entity instance
"""
entity = entity.pre_add_hook()
eschema = entity.e_schema
etype = str(eschema)
source = self.locate_etype_source(etype)
# attribute an eid to the entity before calling hooks
entity.set_eid(self.system_source.create_eid(session))
entity._is_saved = False # entity has an eid but is not yet saved
relations = []
# if inlined relations are specified, fill entity's related cache to
# avoid unnecessary queries
for attr in entity.keys():
rschema = eschema.subject_relation(attr)
if not rschema.is_final(): # inlined relation
entity.set_related_cache(attr, 'subject',
entity.req.eid_rset(entity[attr]))
relations.append((attr, entity[attr]))
if source.should_call_hooks:
self.hm.call_hooks('before_add_entity', etype, session, entity)
entity.set_defaults()
entity.check(creation=True)
source.add_entity(session, entity)
if source.uri != 'system':
extid = source.get_extid(entity)
self._extid_cache[(str(extid), source.uri)] = entity.eid
else:
extid = None
self.add_info(session, entity, source, extid, complete=False)
entity._is_saved = True # entity has an eid and is saved
#print 'added', entity#, entity.items()
# trigger after_add_entity after after_add_relation
if source.should_call_hooks:
self.hm.call_hooks('after_add_entity', etype, session, entity)
# call hooks for inlined relations
for attr, value in relations:
self.hm.call_hooks('before_add_relation', attr, session,
entity.eid, attr, value)
self.hm.call_hooks('after_add_relation', attr, session,
entity.eid, attr, value)
return entity.eid
def glob_update_entity(self, session, entity):
"""replace an entity in the repository
the type and the eid of an entity must not be changed
"""
#print 'update', entity
entity.check()
etype = str(entity.e_schema)
eschema = entity.e_schema
only_inline_rels, need_fti_update = True, False
relations = []
for attr in entity.keys():
if attr == 'eid':
continue
rschema = eschema.subject_relation(attr)
if rschema.is_final():
if eschema.rproperty(attr, 'fulltextindexed'):
need_fti_update = True
only_inline_rels = False
else:
# inlined relation
previous_value = entity.related(attr)
if previous_value:
previous_value = previous_value[0][0] # got a result set
self.hm.call_hooks('before_delete_relation', attr, session,
entity.eid, attr, previous_value)
entity.set_related_cache(attr, 'subject',
entity.req.eid_rset(entity[attr]))
relations.append((attr, entity[attr], previous_value))
source = self.source_from_eid(entity.eid, session)
if source.should_call_hooks:
# call hooks for inlined relations
for attr, value, _ in relations:
self.hm.call_hooks('before_add_relation', attr, session,
entity.eid, attr, value)
if not only_inline_rels:
self.hm.call_hooks('before_update_entity', etype, session,
entity)
source.update_entity(session, entity)
if not only_inline_rels:
if need_fti_update:
# reindex the entity only if this query is updating at least
# one indexable attribute
FTIndexEntityOp(session, entity=entity)
if source.should_call_hooks:
self.hm.call_hooks('after_update_entity', etype, session,
entity)
if source.should_call_hooks:
for attr, value, prevvalue in relations:
if prevvalue:
self.hm.call_hooks('after_delete_relation', attr, session,
entity.eid, attr, prevvalue)
del_existing_rel_if_needed(session, entity.eid, attr, value)
self.hm.call_hooks('after_add_relation', attr, session,
entity.eid, attr, value)
def glob_delete_entity(self, session, eid):
"""delete an entity and all related entities from the repository"""
#print 'deleting', eid
# call delete_info before hooks
self._prepare_delete_info(session, eid)
etype, uri, extid = self.type_and_source_from_eid(eid, session)
source = self.sources_by_uri[uri]
if source.should_call_hooks:
self.hm.call_hooks('before_delete_entity', etype, session, eid)
self._delete_info(session, eid)
source.delete_entity(session, etype, eid)
if source.should_call_hooks:
self.hm.call_hooks('after_delete_entity', etype, session, eid)
# don't clear cache here this is done in a hook on commit
def glob_add_relation(self, session, subject, rtype, object):
"""add a relation to the repository"""
assert subject is not None
assert rtype
assert object is not None
source = self.locate_relation_source(session, subject, rtype, object)
#print 'adding', subject, rtype, object, 'to', source
if source.should_call_hooks:
del_existing_rel_if_needed(session, subject, rtype, object)
self.hm.call_hooks('before_add_relation', rtype, session,
subject, rtype, object)
source.add_relation(session, subject, rtype, object)
if source.should_call_hooks:
self.hm.call_hooks('after_add_relation', rtype, session,
subject, rtype, object)
def glob_delete_relation(self, session, subject, rtype, object):
"""delete a relation from the repository"""
assert subject is not None
assert rtype
assert object is not None
source = self.locate_relation_source(session, subject, rtype, object)
#print 'delete rel', subject, rtype, object
if source.should_call_hooks:
self.hm.call_hooks('before_delete_relation', rtype, session,
subject, rtype, object)
source.delete_relation(session, subject, rtype, object)
if self.schema.rschema(rtype).symetric:
# on symetric relation, we can't now in which sense it's
# stored so try to delete both
source.delete_relation(session, object, rtype, subject)
if source.should_call_hooks:
self.hm.call_hooks('after_delete_relation', rtype, session,
subject, rtype, object)
# pyro handling ###########################################################
def pyro_register(self, host=''):
"""register the repository as a pyro object"""
from Pyro import core
port = self.config['pyro-port']
nshost, nsgroup = self.config['pyro-ns-host'], self.config['pyro-ns-group']
nsgroup = ':' + nsgroup
core.initServer(banner=0)
daemon = core.Daemon(host=host, port=port)
daemon.useNameServer(self.pyro_nameserver(nshost, nsgroup))
# use Delegation approach
impl = core.ObjBase()
impl.delegateTo(self)
nsid = self.config['pyro-id'] or self.config.appid
daemon.connect(impl, '%s.%s' % (nsgroup, nsid))
msg = 'repository registered as a pyro object using group %s and id %s'
self.info(msg, nsgroup, nsid)
self.pyro_registered = True
return daemon
def pyro_nameserver(self, host=None, group=None):
"""locate and bind the the name server to the daemon"""
from Pyro import naming, errors
# locate the name server
nameserver = naming.NameServerLocator().getNS(host)
if group is not None:
# make sure our namespace group exists
try:
nameserver.createGroup(group)
except errors.NamingError:
pass
return nameserver
def pyro_unregister(config):
"""unregister the repository from the pyro name server"""
nshost, nsgroup = config['pyro-ns-host'], config['pyro-ns-group']
appid = config['pyro-id'] or config.appid
from Pyro import core, naming, errors
core.initClient(banner=False)
try:
nameserver = naming.NameServerLocator().getNS(nshost)
except errors.PyroError, ex:
# name server not responding
config.error('can\'t locate pyro name server: %s', ex)
return
try:
nameserver.unregister(':%s.%s' % (nsgroup, appid))
config.info('%s unregistered from pyro name server', appid)
except errors.NamingError:
config.warning('%s already unregistered from pyro name server', appid)
from logging import getLogger
from cubicweb import set_log_methods
set_log_methods(Repository, getLogger('cubicweb.repository'))