"""Repository users' and internal' sessions.
: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
"""
from __future__ import with_statement
__docformat__ = "restructuredtext en"
import sys
import threading
from time import time
from uuid import uuid4
from warnings import warn
from logilab.common.deprecation import deprecated
from rql.nodes import VariableRef, Function, ETYPE_PYOBJ_MAP, etype_from_pyobj
from yams import BASE_TYPES
from cubicweb import Binary, UnknownEid, schema
from cubicweb.req import RequestSessionBase
from cubicweb.dbapi import ConnectionProperties
from cubicweb.utils import make_uid, RepeatList
from cubicweb.rqlrewrite import RQLRewriter
ETYPE_PYOBJ_MAP[Binary] = 'Bytes'
NO_UNDO_TYPES = schema.SCHEMA_TYPES.copy()
NO_UNDO_TYPES.add('CWCache')
# is / is_instance_of are usually added by sql hooks except when using
# dataimport.NoHookRQLObjectStore, and we don't want to record them
# anyway in the later case
NO_UNDO_TYPES.add('is')
NO_UNDO_TYPES.add('is_instance_of')
# XXX rememberme,forgotpwd,apycot,vcsfile
def is_final(rqlst, variable, args):
# try to find if this is a final var or not
for select in rqlst.children:
for sol in select.solutions:
etype = variable.get_type(sol, args)
if etype is None:
continue
if etype in BASE_TYPES:
return True
return False
def _make_description(selected, args, solution):
"""return a description for a result set"""
description = []
for term in selected:
description.append(term.get_type(solution, args))
return description
class hooks_control(object):
"""context manager to control activated hooks categories.
If mode is session.`HOOKS_DENY_ALL`, given hooks categories will
be enabled.
If mode is session.`HOOKS_ALLOW_ALL`, given hooks categories will
be disabled.
"""
def __init__(self, session, mode, *categories):
self.session = session
self.mode = mode
self.categories = categories
def __enter__(self):
self.oldmode = self.session.set_hooks_mode(self.mode)
if self.mode is self.session.HOOKS_DENY_ALL:
self.changes = self.session.enable_hook_categories(*self.categories)
else:
self.changes = self.session.disable_hook_categories(*self.categories)
def __exit__(self, exctype, exc, traceback):
if self.changes:
if self.mode is self.session.HOOKS_DENY_ALL:
self.session.disable_hook_categories(*self.changes)
else:
self.session.enable_hook_categories(*self.changes)
self.session.set_hooks_mode(self.oldmode)
INDENT = ''
class security_enabled(object):
"""context manager to control security w/ session.execute, since by
default security is disabled on queries executed on the repository
side.
"""
def __init__(self, session, read=None, write=None):
self.session = session
self.read = read
self.write = write
def __enter__(self):
# global INDENT
if self.read is not None:
self.oldread = self.session.set_read_security(self.read)
# print INDENT + 'read', self.read, self.oldread
if self.write is not None:
self.oldwrite = self.session.set_write_security(self.write)
# print INDENT + 'write', self.write, self.oldwrite
# INDENT += ' '
def __exit__(self, exctype, exc, traceback):
# global INDENT
# INDENT = INDENT[:-2]
if self.read is not None:
self.session.set_read_security(self.oldread)
# print INDENT + 'reset read to', self.oldread
if self.write is not None:
self.session.set_write_security(self.oldwrite)
# print INDENT + 'reset write to', self.oldwrite
class Session(RequestSessionBase):
"""tie session id, user, connections pool and other session data all
together
"""
is_internal_session = False
def __init__(self, user, repo, cnxprops=None, _id=None):
super(Session, self).__init__(repo.vreg)
self.id = _id or make_uid(user.login.encode('UTF8'))
cnxprops = cnxprops or ConnectionProperties('inmemory')
self.user = user
self.repo = repo
self.cnxtype = cnxprops.cnxtype
self.creation = time()
self.timestamp = self.creation
self.default_mode = 'read'
# support undo for Create Update Delete entity / Add Remove relation
if repo.config.creating or repo.config.repairing or self.is_internal_session:
self.undo_actions = ()
else:
self.undo_actions = set(repo.config['undo-support'].upper())
if self.undo_actions - set('CUDAR'):
raise Exception('bad undo-support string in configuration')
# short cut to querier .execute method
self._execute = repo.querier.execute
# shared data, used to communicate extra information between the client
# and the rql server
self.data = {}
# i18n initialization
self.set_language(cnxprops.lang)
# internals
self._threaddata = threading.local()
self._threads_in_transaction = set()
self._closed = False
def __unicode__(self):
return '<%ssession %s (%s 0x%x)>' % (
self.cnxtype, unicode(self.user.login), self.id, id(self))
def hijack_user(self, user):
"""return a fake request/session using specified user"""
session = Session(user, self.repo)
threaddata = session._threaddata
threaddata.pool = self.pool
# share pending_operations, else operation added in the hi-jacked
# session such as SendMailOp won't ever be processed
threaddata.pending_operations = self.pending_operations
# everything in transaction_data should be copied back but the entity
# type cache we don't want to avoid security pb
threaddata.transaction_data = self.transaction_data.copy()
threaddata.transaction_data.pop('ecache', None)
return session
def add_relation(self, fromeid, rtype, toeid):
"""provide direct access to the repository method to add a relation.
This is equivalent to the following rql query:
SET X rtype Y WHERE X eid fromeid, T eid toeid
without read security check but also all the burden of rql execution.
You may use this in hooks when you know both eids of the relation you
want to add.
"""
with security_enabled(self, False, False):
if self.vreg.schema[rtype].inlined:
entity = self.entity_from_eid(fromeid)
entity[rtype] = toeid
self.repo.glob_update_entity(self, entity, set((rtype,)))
else:
self.repo.glob_add_relation(self, fromeid, rtype, toeid)
def delete_relation(self, fromeid, rtype, toeid):
"""provide direct access to the repository method to delete a relation.
This is equivalent to the following rql query:
DELETE X rtype Y WHERE X eid fromeid, T eid toeid
without read security check but also all the burden of rql execution.
You may use this in hooks when you know both eids of the relation you
want to delete.
"""
with security_enabled(self, False, False):
if self.vreg.schema[rtype].inlined:
entity = self.entity_from_eid(fromeid)
entity[rtype] = None
self.repo.glob_update_entity(self, entity, set((rtype,)))
else:
self.repo.glob_delete_relation(self, fromeid, rtype, toeid)
# relations cache handling #################################################
def update_rel_cache_add(self, subject, rtype, object, symmetric=False):
self._update_entity_rel_cache_add(subject, rtype, 'subject', object)
if symmetric:
self._update_entity_rel_cache_add(object, rtype, 'subject', subject)
else:
self._update_entity_rel_cache_add(object, rtype, 'object', subject)
def update_rel_cache_del(self, subject, rtype, object, symmetric=False):
self._update_entity_rel_cache_del(subject, rtype, 'subject', object)
if symmetric:
self._update_entity_rel_cache_del(object, rtype, 'object', object)
else:
self._update_entity_rel_cache_del(object, rtype, 'object', subject)
def _update_entity_rel_cache_add(self, eid, rtype, role, targeteid):
try:
entity = self.entity_cache(eid)
except KeyError:
return
rcache = entity.relation_cached(rtype, role)
if rcache is not None:
rset, entities = rcache
rset = rset.copy()
entities = list(entities)
rset.rows.append([targeteid])
if not isinstance(rset.description, list): # else description not set
rset.description = list(rset.description)
rset.description.append([self.describe(targeteid)[0]])
targetentity = self.entity_from_eid(targeteid)
if targetentity.cw_rset is None:
targetentity.cw_rset = rset
targetentity.cw_row = rset.rowcount
targetentity.cw_col = 0
rset.rowcount += 1
entities.append(targetentity)
entity._related_cache['%s_%s' % (rtype, role)] = (rset, tuple(entities))
def _update_entity_rel_cache_del(self, eid, rtype, role, targeteid):
try:
entity = self.entity_cache(eid)
except KeyError:
return
rcache = entity.relation_cached(rtype, role)
if rcache is not None:
rset, entities = rcache
for idx, row in enumerate(rset.rows):
if row[0] == targeteid:
break
else:
# this may occurs if the cache has been filed by a hook
# after the database update
self.debug('cache inconsistency for %s %s %s %s', eid, rtype,
role, targeteid)
return
rset = rset.copy()
entities = list(entities)
del rset.rows[idx]
if isinstance(rset.description, list): # else description not set
del rset.description[idx]
del entities[idx]
rset.rowcount -= 1
entity._related_cache['%s_%s' % (rtype, role)] = (rset, tuple(entities))
# resource accessors ######################################################
def system_sql(self, sql, args=None, rollback_on_failure=True):
"""return a sql cursor on the system database"""
if sql.split(None, 1)[0].upper() != 'SELECT':
self.mode = 'write'
source = self.pool.source('system')
try:
return source.doexec(self, sql, args, rollback=rollback_on_failure)
except (source.OperationalError, source.InterfaceError):
source.warning("trying to reconnect")
self.pool.reconnect(self)
return source.doexec(self, sql, args, rollback=rollback_on_failure)
def set_language(self, language):
"""i18n configuration for translation"""
vreg = self.vreg
language = language or self.user.property_value('ui.language')
try:
gettext, pgettext = vreg.config.translations[language]
self._ = self.__ = gettext
self.pgettext = pgettext
except KeyError:
language = vreg.property_value('ui.language')
try:
gettext, pgettext = vreg.config.translations[language]
self._ = self.__ = gettext
self.pgettext = pgettext
except KeyError:
self._ = self.__ = unicode
self.pgettext = lambda x, y: y
self.lang = language
def change_property(self, prop, value):
assert prop == 'lang' # this is the only one changeable property for now
self.set_language(value)
def deleted_in_transaction(self, eid):
"""return True if the entity of the given eid is being deleted in the
current transaction
"""
return eid in self.transaction_data.get('pendingeids', ())
def added_in_transaction(self, eid):
"""return True if the entity of the given eid is being created in the
current transaction
"""
return eid in self.transaction_data.get('neweids', ())
def schema_rproperty(self, rtype, eidfrom, eidto, rprop):
rschema = self.repo.schema[rtype]
subjtype = self.describe(eidfrom)[0]
objtype = self.describe(eidto)[0]
rdef = rschema.rdef(subjtype, objtype)
return rdef.get(rprop)
# security control #########################################################
DEFAULT_SECURITY = object() # evaluated to true by design
@property
def read_security(self):
"""return a boolean telling if read security is activated or not"""
try:
return self._threaddata.read_security
except AttributeError:
self._threaddata.read_security = self.DEFAULT_SECURITY
return self._threaddata.read_security
def set_read_security(self, activated):
"""[de]activate read security, returning the previous value set for
later restoration.
you should usually use the `security_enabled` context manager instead
of this to change security settings.
"""
oldmode = self.read_security
self._threaddata.read_security = activated
# dbapi_query used to detect hooks triggered by a 'dbapi' query (eg not
# issued on the session). This is tricky since we the execution model of
# a (write) user query is:
#
# repository.execute (security enabled)
# \-> querier.execute
# \-> repo.glob_xxx (add/update/delete entity/relation)
# \-> deactivate security before calling hooks
# \-> WE WANT TO CHECK QUERY NATURE HERE
# \-> potentially, other calls to querier.execute
#
# so we can't rely on simply checking session.read_security, but
# recalling the first transition from DEFAULT_SECURITY to something
# else (False actually) is not perfect but should be enough
#
# also reset dbapi_query to true when we go back to DEFAULT_SECURITY
self._threaddata.dbapi_query = (oldmode is self.DEFAULT_SECURITY
or activated is self.DEFAULT_SECURITY)
return oldmode
@property
def write_security(self):
"""return a boolean telling if write security is activated or not"""
try:
return self._threaddata.write_security
except:
self._threaddata.write_security = self.DEFAULT_SECURITY
return self._threaddata.write_security
def set_write_security(self, activated):
"""[de]activate write security, returning the previous value set for
later restoration.
you should usually use the `security_enabled` context manager instead
of this to change security settings.
"""
oldmode = self.write_security
self._threaddata.write_security = activated
return oldmode
@property
def running_dbapi_query(self):
"""return a boolean telling if it's triggered by a db-api query or by
a session query.
To be used in hooks, else may have a wrong value.
"""
return getattr(self._threaddata, 'dbapi_query', True)
# hooks activation control #################################################
# all hooks should be activated during normal execution
HOOKS_ALLOW_ALL = object()
HOOKS_DENY_ALL = object()
@property
def hooks_mode(self):
return getattr(self._threaddata, 'hooks_mode', self.HOOKS_ALLOW_ALL)
def set_hooks_mode(self, mode):
assert mode is self.HOOKS_ALLOW_ALL or mode is self.HOOKS_DENY_ALL
oldmode = getattr(self._threaddata, 'hooks_mode', self.HOOKS_ALLOW_ALL)
self._threaddata.hooks_mode = mode
return oldmode
@property
def disabled_hook_categories(self):
try:
return getattr(self._threaddata, 'disabled_hook_cats')
except AttributeError:
cats = self._threaddata.disabled_hook_cats = set()
return cats
@property
def enabled_hook_categories(self):
try:
return getattr(self._threaddata, 'enabled_hook_cats')
except AttributeError:
cats = self._threaddata.enabled_hook_cats = set()
return cats
def disable_hook_categories(self, *categories):
"""disable the given hook categories:
- on HOOKS_DENY_ALL mode, ensure those categories are not enabled
- on HOOKS_ALLOW_ALL mode, ensure those categories are disabled
"""
changes = set()
if self.hooks_mode is self.HOOKS_DENY_ALL:
enablecats = self.enabled_hook_categories
for category in categories:
if category in enablecats:
enablecats.remove(category)
changes.add(category)
else:
disablecats = self.disabled_hook_categories
for category in categories:
if category not in disablecats:
disablecats.add(category)
changes.add(category)
return tuple(changes)
def enable_hook_categories(self, *categories):
"""enable the given hook categories:
- on HOOKS_DENY_ALL mode, ensure those categories are enabled
- on HOOKS_ALLOW_ALL mode, ensure those categories are not disabled
"""
changes = set()
if self.hooks_mode is self.HOOKS_DENY_ALL:
enablecats = self.enabled_hook_categories
for category in categories:
if category not in enablecats:
enablecats.add(category)
changes.add(category)
else:
disablecats = self.disabled_hook_categories
for category in categories:
if category in self.disabled_hook_categories:
disablecats.remove(category)
changes.add(category)
return tuple(changes)
def is_hook_category_activated(self, category):
"""return a boolean telling if the given category is currently activated
or not
"""
if self.hooks_mode is self.HOOKS_DENY_ALL:
return category in self.enabled_hook_categories
return category not in self.disabled_hook_categories
def is_hook_activated(self, hook):
"""return a boolean telling if the given hook class is currently
activated or not
"""
return self.is_hook_category_activated(hook.category)
# connection management ###################################################
def keep_pool_mode(self, mode):
"""set pool_mode, e.g. how the session will keep its pool:
* if mode == 'write', the pool is freed after each ready query, but kept
until the transaction's end (eg commit or rollback) when a write query
is detected (eg INSERT/SET/DELETE queries)
* if mode == 'transaction', the pool is only freed after the
transaction's end
notice that a repository has a limited set of pools, and a session has to
wait for a free pool to run any rql query (unless it already has a pool
set).
"""
assert mode in ('transaction', 'write')
if mode == 'transaction':
self.default_mode = 'transaction'
else: # mode == 'write'
self.default_mode = 'read'
def get_mode(self):
return getattr(self._threaddata, 'mode', self.default_mode)
def set_mode(self, value):
self._threaddata.mode = value
mode = property(get_mode, set_mode,
doc='transaction mode (read/write/transaction), resetted to'
' default_mode on commit / rollback')
def get_commit_state(self):
return getattr(self._threaddata, 'commit_state', None)
def set_commit_state(self, value):
self._threaddata.commit_state = value
commit_state = property(get_commit_state, set_commit_state)
@property
def pool(self):
"""connections pool, set according to transaction mode for each query"""
return getattr(self._threaddata, 'pool', None)
def set_pool(self, checkclosed=True):
"""the session need a pool to execute some queries"""
if checkclosed and self._closed:
raise Exception('try to set pool on a closed session')
if self.pool is None:
# get pool first to avoid race-condition
self._threaddata.pool = pool = self.repo._get_pool()
try:
pool.pool_set()
except:
self._threaddata.pool = None
self.repo._free_pool(pool)
raise
self._threads_in_transaction.add(threading.currentThread())
return self._threaddata.pool
def reset_pool(self, ignoremode=False):
"""the session is no longer using its pool, at least for some time"""
# pool may be none if no operation has been done since last commit
# or rollback
if self.pool is not None and (ignoremode or self.mode == 'read'):
# even in read mode, we must release the current transaction
pool = self.pool
try:
self._threads_in_transaction.remove(threading.currentThread())
except KeyError:
pass
pool.pool_reset()
del self._threaddata.pool
# free pool once everything is done to avoid race-condition
self.repo._free_pool(pool)
def _touch(self):
"""update latest session usage timestamp and reset mode to read"""
self.timestamp = time()
self.local_perm_cache.clear() # XXX simply move in transaction_data, no?
self._threaddata.mode = self.default_mode
# shared data handling ###################################################
def get_shared_data(self, key, default=None, pop=False):
"""return value associated to `key` in session data"""
if pop:
return self.data.pop(key, default)
else:
return self.data.get(key, default)
def set_shared_data(self, key, value, querydata=False):
"""set value associated to `key` in session data"""
if querydata:
self.transaction_data[key] = value
else:
self.data[key] = value
# request interface #######################################################
@property
def cursor(self):
"""return a rql cursor"""
return self
def set_entity_cache(self, entity):
# XXX session level caching may be a pb with multiple repository
# instances, but 1. this is probably not the only one :$ and 2. it
# may be an acceptable risk. Anyway we could activate it or not
# according to a configuration option
try:
self.transaction_data['ecache'].setdefault(entity.eid, entity)
except KeyError:
self.transaction_data['ecache'] = ecache = {}
ecache[entity.eid] = entity
def entity_cache(self, eid):
return self.transaction_data['ecache'][eid]
def cached_entities(self):
return self.transaction_data.get('ecache', {}).values()
def drop_entity_cache(self, eid=None):
if eid is None:
self.transaction_data.pop('ecache', None)
else:
del self.transaction_data['ecache'][eid]
def base_url(self):
url = self.repo.config['base-url']
if not url:
try:
url = self.repo.config.default_base_url()
except AttributeError: # default_base_url() might not be available
self.warning('missing base-url definition in server config')
url = u''
return url
def from_controller(self):
"""return the id (string) of the controller issuing the request (no
sense here, always return 'view')
"""
return 'view'
def source_defs(self):
return self.repo.source_defs()
def describe(self, eid):
"""return a tuple (type, sourceuri, extid) for the entity with id <eid>"""
return self.repo.type_and_source_from_eid(eid, self)
# db-api like interface ###################################################
def source_from_eid(self, eid):
"""return the source where the entity with id <eid> is located"""
return self.repo.source_from_eid(eid, self)
def execute(self, rql, kwargs=None, eid_key=None, build_descr=True):
"""db-api like method directly linked to the querier execute method.
See :meth:`cubicweb.dbapi.Cursor.execute` documentation.
"""
if eid_key is not None:
warn('[3.8] eid_key is deprecated, you can safely remove this argument',
DeprecationWarning, stacklevel=2)
rset = self._execute(self, rql, kwargs, build_descr)
rset.req = self
return rset
def _clear_thread_data(self):
"""remove everything from the thread local storage, except pool
which is explicitly removed by reset_pool, and mode which is set anyway
by _touch
"""
store = self._threaddata
for name in ('commit_state', 'transaction_data', 'pending_operations',
'_rewriter'):
try:
delattr(store, name)
except AttributeError:
pass
def commit(self, reset_pool=True):
"""commit the current session's transaction"""
if self.pool is None:
assert not self.pending_operations
self._clear_thread_data()
self._touch()
self.debug('commit session %s done (no db activity)', self.id)
return
if self.commit_state:
return
# by default, operations are executed with security turned off
with security_enabled(self, False, False):
# on rollback, an operation should have the following state
# information:
# - processed by the precommit/commit event or not
# - if processed, is it the failed operation
try:
for trstate in ('precommit', 'commit'):
processed = []
self.commit_state = trstate
try:
while self.pending_operations:
operation = self.pending_operations.pop(0)
operation.processed = trstate
processed.append(operation)
operation.handle_event('%s_event' % trstate)
self.pending_operations[:] = processed
self.debug('%s session %s done', trstate, self.id)
except:
self.exception('error while %sing', trstate)
# if error on [pre]commit:
#
# * set .failed = True on the operation causing the failure
# * call revert<event>_event on processed operations
# * call rollback_event on *all* operations
#
# that seems more natural than not calling rollback_event
# for processed operations, and allow generic rollback
# instead of having to implements rollback, revertprecommit
# and revertcommit, that will be enough in mont case.
operation.failed = True
for operation in processed:
operation.handle_event('revert%s_event' % trstate)
# XXX use slice notation since self.pending_operations is a
# read-only property.
self.pending_operations[:] = processed + self.pending_operations
self.rollback(reset_pool)
raise
self.pool.commit()
self.commit_state = trstate = 'postcommit'
while self.pending_operations:
operation = self.pending_operations.pop(0)
operation.processed = trstate
try:
operation.handle_event('%s_event' % trstate)
except:
self.critical('error while %sing', trstate,
exc_info=sys.exc_info())
self.info('%s session %s done', trstate, self.id)
return self.transaction_uuid(set=False)
finally:
self._clear_thread_data()
self._touch()
if reset_pool:
self.reset_pool(ignoremode=True)
def rollback(self, reset_pool=True):
"""rollback the current session's transaction"""
if self.pool is None:
assert not self.pending_operations
self._clear_thread_data()
self._touch()
self.debug('rollback session %s done (no db activity)', self.id)
return
# by default, operations are executed with security turned off
with security_enabled(self, False, False):
try:
while self.pending_operations:
try:
operation = self.pending_operations.pop(0)
operation.handle_event('rollback_event')
except:
self.critical('rollback error', exc_info=sys.exc_info())
continue
self.pool.rollback()
self.debug('rollback for session %s done', self.id)
finally:
self._clear_thread_data()
self._touch()
if reset_pool:
self.reset_pool(ignoremode=True)
def close(self):
"""do not close pool on session close, since they are shared now"""
self._closed = True
# copy since _threads_in_transaction maybe modified while waiting
for thread in self._threads_in_transaction.copy():
if thread is threading.currentThread():
continue
self.info('waiting for thread %s', thread)
# do this loop/break instead of a simple join(10) in case thread is
# the main thread (in which case it will be removed from
# self._threads_in_transaction but still be alive...)
for i in xrange(10):
thread.join(1)
if not (thread.isAlive() and
thread in self._threads_in_transaction):
break
else:
self.error('thread %s still alive after 10 seconds, will close '
'session anyway', thread)
self.rollback()
del self._threaddata
# transaction data/operations management ##################################
@property
def transaction_data(self):
try:
return self._threaddata.transaction_data
except AttributeError:
self._threaddata.transaction_data = {}
return self._threaddata.transaction_data
@property
def pending_operations(self):
try:
return self._threaddata.pending_operations
except AttributeError:
self._threaddata.pending_operations = []
return self._threaddata.pending_operations
def add_operation(self, operation, index=None):
"""add an observer"""
assert self.commit_state != 'commit'
if index is None:
self.pending_operations.append(operation)
else:
self.pending_operations.insert(index, operation)
# undo support ############################################################
def undoable_action(self, action, ertype):
return action in self.undo_actions and not ertype in NO_UNDO_TYPES
# XXX elif transaction on mark it partial
def transaction_uuid(self, set=True):
try:
return self.transaction_data['tx_uuid']
except KeyError:
if not set:
return
self.transaction_data['tx_uuid'] = uuid = uuid4().hex
self.repo.system_source.start_undoable_transaction(self, uuid)
return uuid
def transaction_inc_action_counter(self):
num = self.transaction_data.setdefault('tx_action_count', 0) + 1
self.transaction_data['tx_action_count'] = num
return num
# querier helpers #########################################################
@property
def rql_rewriter(self):
# in thread local storage since the rewriter isn't thread safe
try:
return self._threaddata._rewriter
except AttributeError:
self._threaddata._rewriter = RQLRewriter(self)
return self._threaddata._rewriter
def build_description(self, rqlst, args, result):
"""build a description for a given result"""
if len(rqlst.children) == 1 and len(rqlst.children[0].solutions) == 1:
# easy, all lines are identical
selected = rqlst.children[0].selection
solution = rqlst.children[0].solutions[0]
description = _make_description(selected, args, solution)
return RepeatList(len(result), tuple(description))
# hard, delegate the work :o)
return self.manual_build_descr(rqlst, args, result)
def manual_build_descr(self, rqlst, args, result):
"""build a description for a given result by analysing each row
XXX could probably be done more efficiently during execution of query
"""
# not so easy, looks for variable which changes from one solution
# to another
unstables = rqlst.get_variable_variables()
basedescription = []
todetermine = []
selected = rqlst.children[0].selection # sample selection
for i, term in enumerate(selected):
if isinstance(term, Function) and term.descr().rtype is not None:
basedescription.append(term.get_type(term.descr().rtype, args))
continue
for vref in term.get_nodes(VariableRef):
if vref.name in unstables:
basedescription.append(None)
todetermine.append( (i, is_final(rqlst, vref.variable, args)) )
break
else:
# sample etype
etype = rqlst.children[0].solutions[0]
basedescription.append(term.get_type(etype, args))
if not todetermine:
return RepeatList(len(result), tuple(basedescription))
return self._build_descr(result, basedescription, todetermine)
def _build_descr(self, result, basedescription, todetermine):
description = []
etype_from_eid = self.describe
for row in result:
row_descr = basedescription
for index, isfinal in todetermine:
value = row[index]
if value is None:
# None value inserted by an outer join, no type
row_descr[index] = None
continue
if isfinal:
row_descr[index] = etype_from_pyobj(value)
else:
try:
row_descr[index] = etype_from_eid(value)[0]
except UnknownEid:
self.critical('wrong eid %s in repository, should check database' % value)
row_descr[index] = row[index] = None
description.append(tuple(row_descr))
return description
# deprecated ###############################################################
@deprecated("[3.7] execute is now unsafe by default in hooks/operation. You"
" can also control security with the security_enabled context "
"manager")
def unsafe_execute(self, rql, kwargs=None, eid_key=None, build_descr=True,
propagate=False):
"""like .execute but with security checking disabled (this method is
internal to the server, it's not part of the db-api)
"""
with security_enabled(self, read=False, write=False):
return self.execute(rql, kwargs, eid_key, build_descr)
@property
@deprecated("[3.7] is_super_session is deprecated, test "
"session.read_security and or session.write_security")
def is_super_session(self):
return not self.read_security or not self.write_security
@deprecated("[3.7] session is actual session")
def actual_session(self):
"""return the original parent session if any, else self"""
return self
@property
@deprecated("[3.6] use session.vreg.schema")
def schema(self):
return self.repo.schema
@deprecated("[3.4] use vreg['etypes'].etype_class(etype)")
def etype_class(self, etype):
"""return an entity class for the given entity type"""
return self.vreg['etypes'].etype_class(etype)
@deprecated('[3.4] use direct access to session.transaction_data')
def query_data(self, key, default=None, setdefault=False, pop=False):
if setdefault:
assert not pop
return self.transaction_data.setdefault(key, default)
if pop:
return self.transaction_data.pop(key, default)
else:
return self.transaction_data.get(key, default)
@deprecated('[3.4] use entity_from_eid(eid, etype=None)')
def entity(self, eid):
"""return a result set for the given eid"""
return self.entity_from_eid(eid)
class InternalSession(Session):
"""special session created internaly by the repository"""
is_internal_session = True
running_dbapi_query = False
def __init__(self, repo, cnxprops=None):
super(InternalSession, self).__init__(InternalManager(), repo, cnxprops,
_id='internal')
self.user.req = self # XXX remove when "vreg = user.req.vreg" hack in entity.py is gone
self.cnxtype = 'inmemory'
self.disable_hook_categories('integrity')
class InternalManager(object):
"""a manager user with all access rights used internally for task such as
bootstrapping the repository or creating regular users according to
repository content
"""
def __init__(self):
self.eid = -1
self.login = u'__internal_manager__'
self.properties = {}
def matching_groups(self, groups):
return 1
def is_in_group(self, group):
return True
def owns(self, eid):
return True
def has_permission(self, pname, contexteid=None):
return True
def property_value(self, key):
if key == 'ui.language':
return 'en'
return None
from logging import getLogger
from cubicweb import set_log_methods
set_log_methods(Session, getLogger('cubicweb.session'))