# copyright 2003-2015 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/>.
"""Repository users' and internal' sessions."""
from __future__ import print_function
__docformat__ = "restructuredtext en"
import sys
from time import time
from uuid import uuid4
from warnings import warn
import functools
from contextlib import contextmanager
from six import text_type
from logilab.common.deprecation import deprecated
from logilab.common.textutils import unormalize
from logilab.common.registry import objectify_predicate
from cubicweb import QueryError, schema, server, ProgrammingError
from cubicweb.req import RequestSessionBase
from cubicweb.utils import make_uid
from cubicweb.rqlrewrite import RQLRewriter
from cubicweb.server.edition import EditedEntity
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')
NO_UNDO_TYPES.add('cw_source')
# XXX rememberme,forgotpwd,apycot,vcsfile
@objectify_predicate
def is_user_session(cls, req, **kwargs):
"""return 1 when session is not internal.
This predicate can only be used repository side only. """
return not req.is_internal_session
@objectify_predicate
def is_internal_session(cls, req, **kwargs):
"""return 1 when session is not internal.
This predicate can only be used repository side only. """
return req.is_internal_session
@objectify_predicate
def repairing(cls, req, **kwargs):
"""return 1 when repository is running in repair mode"""
return req.vreg.config.repairing
@deprecated('[3.17] use <object>.allow/deny_all_hooks_but instead')
def hooks_control(obj, mode, *categories):
assert mode in (HOOKS_ALLOW_ALL, HOOKS_DENY_ALL)
if mode == HOOKS_ALLOW_ALL:
return obj.allow_all_hooks_but(*categories)
elif mode == HOOKS_DENY_ALL:
return obj.deny_all_hooks_but(*categories)
class _hooks_control(object):
"""context manager to control activated hooks categories.
If mode is `HOOKS_DENY_ALL`, given hooks categories will
be enabled.
If mode is `HOOKS_ALLOW_ALL`, given hooks categories will
be disabled.
.. sourcecode:: python
with _hooks_control(cnx, HOOKS_ALLOW_ALL, 'integrity'):
# ... do stuff with all but 'integrity' hooks activated
with _hooks_control(cnx, HOOKS_DENY_ALL, 'integrity'):
# ... do stuff with none but 'integrity' hooks activated
This is an internal API, you should rather use
:meth:`~cubicweb.server.session.Connection.deny_all_hooks_but` or
:meth:`~cubicweb.server.session.Connection.allow_all_hooks_but`
Connection methods.
"""
def __init__(self, cnx, mode, *categories):
assert mode in (HOOKS_ALLOW_ALL, HOOKS_DENY_ALL)
self.cnx = cnx
self.mode = mode
self.categories = categories
self.oldmode = None
self.changes = ()
def __enter__(self):
self.oldmode = self.cnx.hooks_mode
self.cnx.hooks_mode = self.mode
if self.mode is HOOKS_DENY_ALL:
self.changes = self.cnx.enable_hook_categories(*self.categories)
else:
self.changes = self.cnx.disable_hook_categories(*self.categories)
self.cnx.ctx_count += 1
def __exit__(self, exctype, exc, traceback):
self.cnx.ctx_count -= 1
try:
if self.categories:
if self.mode is HOOKS_DENY_ALL:
self.cnx.disable_hook_categories(*self.categories)
else:
self.cnx.enable_hook_categories(*self.categories)
finally:
self.cnx.hooks_mode = self.oldmode
@deprecated('[3.17] use <object>.security_enabled instead')
def security_enabled(obj, *args, **kwargs):
return obj.security_enabled(*args, **kwargs)
class _security_enabled(object):
"""context manager to control security w/ session.execute,
By default security is disabled on queries executed on the repository
side.
"""
def __init__(self, cnx, read=None, write=None):
self.cnx = cnx
self.read = read
self.write = write
self.oldread = None
self.oldwrite = None
def __enter__(self):
if self.read is None:
self.oldread = None
else:
self.oldread = self.cnx.read_security
self.cnx.read_security = self.read
if self.write is None:
self.oldwrite = None
else:
self.oldwrite = self.cnx.write_security
self.cnx.write_security = self.write
self.cnx.ctx_count += 1
def __exit__(self, exctype, exc, traceback):
self.cnx.ctx_count -= 1
if self.oldread is not None:
self.cnx.read_security = self.oldread
if self.oldwrite is not None:
self.cnx.write_security = self.oldwrite
HOOKS_ALLOW_ALL = object()
HOOKS_DENY_ALL = object()
DEFAULT_SECURITY = object() # evaluated to true by design
class SessionClosedError(RuntimeError):
pass
def _open_only(func):
"""decorator for Connection method that check it is open"""
@functools.wraps(func)
def check_open(cnx, *args, **kwargs):
if not cnx._open:
raise ProgrammingError('Closed Connection: %s'
% cnx.connectionid)
return func(cnx, *args, **kwargs)
return check_open
class Connection(RequestSessionBase):
"""Repository Connection
Holds all connection related data
Database connection resources:
:attr:`hooks_in_progress`, boolean flag telling if the executing
query is coming from a repoapi connection or is a query from
within the repository (e.g. started by hooks)
:attr:`cnxset`, the connections set to use to execute queries on sources.
If the transaction is read only, the connection set may be freed between
actual queries. This allows multiple connections with a reasonably low
connection set pool size. Control mechanism is detailed below.
.. automethod:: cubicweb.server.session.Connection.set_cnxset
.. automethod:: cubicweb.server.session.Connection.free_cnxset
:attr:`mode`, string telling the connections set handling mode, may be one
of 'read' (connections set may be freed), 'write' (some write was done in
the connections set, it can't be freed before end of the transaction),
'transaction' (we want to keep the connections set during all the
transaction, with or without writing)
Shared data:
:attr:`data` is a dictionary bound to the underlying session,
who will be present for the life time of the session. This may
be useful for web clients that rely on the server for managing
bits of session-scoped data.
:attr:`transaction_data` is a dictionary cleared at the end of
the transaction. Hooks and operations may put arbitrary data in
there.
Internal state:
:attr:`pending_operations`, ordered list of operations to be processed on
commit/rollback
:attr:`commit_state`, describing the transaction commit state, may be one
of None (not yet committing), 'precommit' (calling precommit event on
operations), 'postcommit' (calling postcommit event on operations),
'uncommitable' (some :exc:`ValidationError` or :exc:`Unauthorized` error
has been raised during the transaction and so it must be rolled back).
Hooks controls:
:attr:`hooks_mode`, may be either `HOOKS_ALLOW_ALL` or `HOOKS_DENY_ALL`.
:attr:`enabled_hook_cats`, when :attr:`hooks_mode` is
`HOOKS_DENY_ALL`, this set contains hooks categories that are enabled.
:attr:`disabled_hook_cats`, when :attr:`hooks_mode` is
`HOOKS_ALLOW_ALL`, this set contains hooks categories that are disabled.
Security level Management:
:attr:`read_security` and :attr:`write_security`, boolean flags telling if
read/write security is currently activated.
"""
is_request = False
hooks_in_progress = False
is_repo_in_memory = True # bw compat
def __init__(self, session):
# using super(Connection, self) confuse some test hack
RequestSessionBase.__init__(self, session.vreg)
#: connection unique id
self._open = None
self.connectionid = '%s-%s' % (session.sessionid, uuid4().hex)
self.session = session
self.sessionid = session.sessionid
#: reentrance handling
self.ctx_count = 0
#: server.Repository object
self.repo = session.repo
self.vreg = self.repo.vreg
self._execute = self.repo.querier.execute
# other session utility
self._session_timestamp = session._timestamp
# internal (root) session
self.is_internal_session = isinstance(session.user, InternalManager)
#: dict containing arbitrary data cleared at the end of the transaction
self.transaction_data = {}
self._session_data = session.data
#: ordered list of operations to be processed on commit/rollback
self.pending_operations = []
#: (None, 'precommit', 'postcommit', 'uncommitable')
self.commit_state = None
### hook control attribute
self.hooks_mode = HOOKS_ALLOW_ALL
self.disabled_hook_cats = set()
self.enabled_hook_cats = set()
self.pruned_hooks_cache = {}
### security control attributes
self._read_security = DEFAULT_SECURITY # handled by a property
self.write_security = DEFAULT_SECURITY
# undo control
config = session.repo.config
if config.creating or config.repairing or self.is_internal_session:
self.undo_actions = False
else:
self.undo_actions = config['undo-enabled']
# RQLRewriter are not thread safe
self._rewriter = RQLRewriter(self)
# other session utility
if session.user.login == '__internal_manager__':
self.user = session.user
self.set_language(self.user.prefered_language())
else:
self._set_user(session.user)
@_open_only
def source_defs(self):
"""Return the definition of sources used by the repository."""
return self.session.repo.source_defs()
@_open_only
def get_schema(self):
"""Return the schema currently used by the repository."""
return self.session.repo.source_defs()
@_open_only
def get_option_value(self, option):
"""Return the value for `option` in the configuration."""
return self.session.repo.get_option_value(option)
# transaction api
@_open_only
def undoable_transactions(self, ueid=None, **actionfilters):
"""Return a list of undoable transaction objects by the connection's
user, ordered by descendant transaction time.
Managers may filter according to user (eid) who has done the transaction
using the `ueid` argument. Others will only see their own transactions.
Additional filtering capabilities is provided by using the following
named arguments:
* `etype` to get only transactions creating/updating/deleting entities
of the given type
* `eid` to get only transactions applied to entity of the given eid
* `action` to get only transactions doing the given action (action in
'C', 'U', 'D', 'A', 'R'). If `etype`, action can only be 'C', 'U' or
'D'.
* `public`: when additional filtering is provided, they are by default
only searched in 'public' actions, unless a `public` argument is given
and set to false.
"""
return self.repo.system_source.undoable_transactions(self, ueid,
**actionfilters)
@_open_only
def transaction_info(self, txuuid):
"""Return transaction object for the given uid.
raise `NoSuchTransaction` if not found or if session's user is
not allowed (eg not in managers group and the transaction
doesn't belong to him).
"""
return self.repo.system_source.tx_info(self, txuuid)
@_open_only
def transaction_actions(self, txuuid, public=True):
"""Return an ordered list of actions effectued during that transaction.
If public is true, return only 'public' actions, i.e. not ones
triggered under the cover by hooks, else return all actions.
raise `NoSuchTransaction` if the transaction is not found or
if the user is not allowed (eg not in managers group).
"""
return self.repo.system_source.tx_actions(self, txuuid, public)
@_open_only
def undo_transaction(self, txuuid):
"""Undo the given transaction. Return potential restoration errors.
raise `NoSuchTransaction` if not found or if user is not
allowed (eg not in managers group).
"""
return self.repo.system_source.undo_transaction(self, txuuid)
# life cycle handling ####################################################
def __enter__(self):
assert self._open is None # first opening
self._open = True
self.cnxset = self.repo._get_cnxset()
return self
def __exit__(self, exctype=None, excvalue=None, tb=None):
assert self._open # actually already open
self.rollback()
self._open = False
self.cnxset.cnxset_freed()
self.repo._free_cnxset(self.cnxset)
self.cnxset = None
@contextmanager
def running_hooks_ops(self):
"""this context manager should be called whenever hooks or operations
are about to be run (but after hook selection)
It will help the undo logic record pertinent metadata or some
hooks to run (or not) depending on who/what issued the query.
"""
prevmode = self.hooks_in_progress
self.hooks_in_progress = True
yield
self.hooks_in_progress = prevmode
# shared data handling ###################################################
@property
def data(self):
return self._session_data
@property
def rql_rewriter(self):
return self._rewriter
@_open_only
@deprecated('[3.19] use session or transaction data', stacklevel=3)
def get_shared_data(self, key, default=None, pop=False, txdata=False):
"""return value associated to `key` in session data"""
if txdata:
data = self.transaction_data
else:
data = self._session_data
if pop:
return data.pop(key, default)
else:
return data.get(key, default)
@_open_only
@deprecated('[3.19] use session or transaction data', stacklevel=3)
def set_shared_data(self, key, value, txdata=False):
"""set value associated to `key` in session data"""
if txdata:
self.transaction_data[key] = value
else:
self._session_data[key] = value
def clear(self):
"""reset internal data"""
self.transaction_data = {}
#: ordered list of operations to be processed on commit/rollback
self.pending_operations = []
#: (None, 'precommit', 'postcommit', 'uncommitable')
self.commit_state = None
self.pruned_hooks_cache = {}
self.local_perm_cache.clear()
self.rewriter = RQLRewriter(self)
@deprecated('[3.19] cnxset are automatically managed now.'
' stop using explicit set and free.')
def set_cnxset(self):
pass
@deprecated('[3.19] cnxset are automatically managed now.'
' stop using explicit set and free.')
def free_cnxset(self, ignoremode=False):
pass
@property
@contextmanager
@_open_only
@deprecated('[3.21] a cnxset is automatically set on __enter__ call now.'
' stop using .ensure_cnx_set')
def ensure_cnx_set(self):
yield
@property
def anonymous_connection(self):
return self.session.anonymous_session
# Entity cache management #################################################
#
# The connection entity cache as held in cnx.transaction_data is removed at the
# end of the connection (commit and rollback)
#
# XXX connection 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
def set_entity_cache(self, entity):
"""Add `entity` to the connection entity cache"""
# XXX not using _open_only because before at creation time. _set_user
# call this function to cache the Connection user.
if entity.cw_etype != 'CWUser' and not self._open:
raise ProgrammingError('Closed Connection: %s'
% self.connectionid)
ecache = self.transaction_data.setdefault('ecache', {})
ecache.setdefault(entity.eid, entity)
@_open_only
def entity_cache(self, eid):
"""get cache entity for `eid`"""
return self.transaction_data['ecache'][eid]
@_open_only
def cached_entities(self):
"""return the whole entity cache"""
return self.transaction_data.get('ecache', {}).values()
@_open_only
def drop_entity_cache(self, eid=None):
"""drop entity from the cache
If eid is None, the whole cache is dropped"""
if eid is None:
self.transaction_data.pop('ecache', None)
else:
del self.transaction_data['ecache'][eid]
# relations handling #######################################################
@_open_only
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.
"""
self.add_relations([(rtype, [(fromeid, toeid)])])
@_open_only
def add_relations(self, relations):
'''set many relation using a shortcut similar to the one in add_relation
relations is a list of 2-uples, the first element of each
2-uple is the rtype, and the second is a list of (fromeid,
toeid) tuples
'''
edited_entities = {}
relations_dict = {}
with self.security_enabled(False, False):
for rtype, eids in relations:
if self.vreg.schema[rtype].inlined:
for fromeid, toeid in eids:
if fromeid not in edited_entities:
entity = self.entity_from_eid(fromeid)
edited = EditedEntity(entity)
edited_entities[fromeid] = edited
else:
edited = edited_entities[fromeid]
edited.edited_attribute(rtype, toeid)
else:
relations_dict[rtype] = eids
self.repo.glob_add_relations(self, relations_dict)
for edited in edited_entities.values():
self.repo.glob_update_entity(self, edited)
@_open_only
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 self.security_enabled(False, False):
if self.vreg.schema[rtype].inlined:
entity = self.entity_from_eid(fromeid)
entity.cw_attr_cache[rtype] = None
self.repo.glob_update_entity(self, entity, set((rtype,)))
else:
self.repo.glob_delete_relation(self, fromeid, rtype, toeid)
# relations cache handling #################################################
@_open_only
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)
@_open_only
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)
@_open_only
def _update_entity_rel_cache_add(self, eid, rtype, role, targeteid):
try:
entity = self.entity_cache(eid)
except KeyError:
return
rcache = entity.cw_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.entity_metas(targeteid)['type']])
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._cw_related_cache['%s_%s' % (rtype, role)] = (
rset, tuple(entities))
@_open_only
def _update_entity_rel_cache_del(self, eid, rtype, role, targeteid):
try:
entity = self.entity_cache(eid)
except KeyError:
return
rcache = entity.cw_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._cw_related_cache['%s_%s' % (rtype, role)] = (
rset, tuple(entities))
# Tracking of entities added of removed in the transaction ##################
@_open_only
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', ())
@_open_only
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', ())
# Operation management ####################################################
@_open_only
def add_operation(self, operation, index=None):
"""add an operation to be executed at the end of the transaction"""
if index is None:
self.pending_operations.append(operation)
else:
self.pending_operations.insert(index, operation)
# Hooks control ###########################################################
@_open_only
def allow_all_hooks_but(self, *categories):
return _hooks_control(self, HOOKS_ALLOW_ALL, *categories)
@_open_only
def deny_all_hooks_but(self, *categories):
return _hooks_control(self, HOOKS_DENY_ALL, *categories)
@_open_only
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()
self.pruned_hooks_cache.clear()
categories = set(categories)
if self.hooks_mode is HOOKS_DENY_ALL:
enabledcats = self.enabled_hook_cats
changes = enabledcats & categories
enabledcats -= changes # changes is small hence faster
else:
disabledcats = self.disabled_hook_cats
changes = categories - disabledcats
disabledcats |= changes # changes is small hence faster
return tuple(changes)
@_open_only
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()
self.pruned_hooks_cache.clear()
categories = set(categories)
if self.hooks_mode is HOOKS_DENY_ALL:
enabledcats = self.enabled_hook_cats
changes = categories - enabledcats
enabledcats |= changes # changes is small hence faster
else:
disabledcats = self.disabled_hook_cats
changes = disabledcats & categories
disabledcats -= changes # changes is small hence faster
return tuple(changes)
@_open_only
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 HOOKS_DENY_ALL:
return category in self.enabled_hook_cats
return category not in self.disabled_hook_cats
@_open_only
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)
# Security management #####################################################
@_open_only
def security_enabled(self, read=None, write=None):
return _security_enabled(self, read=read, write=write)
@property
@_open_only
def read_security(self):
return self._read_security
@read_security.setter
@_open_only
def read_security(self, activated):
self._read_security = activated
# undo support ############################################################
@_open_only
def ertype_supports_undo(self, ertype):
return self.undo_actions and ertype not in NO_UNDO_TYPES
@_open_only
def transaction_uuid(self, set=True):
uuid = self.transaction_data.get('tx_uuid')
if set and uuid is None:
self.transaction_data['tx_uuid'] = uuid = text_type(uuid4().hex)
self.repo.system_source.start_undoable_transaction(self, uuid)
return uuid
@_open_only
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
# db-api like interface ###################################################
@_open_only
def source_defs(self):
return self.repo.source_defs()
@deprecated('[3.19] use .entity_metas(eid) instead')
@_open_only
def describe(self, eid, asdict=False):
"""return a tuple (type, sourceuri, extid) for the entity with id <eid>"""
etype, extid, source = self.repo.type_and_source_from_eid(eid, self)
metas = {'type': etype, 'source': source, 'extid': extid}
if asdict:
metas['asource'] = metas['source'] # XXX pre 3.19 client compat
return metas
return etype, source, extid
@_open_only
def entity_metas(self, eid):
"""return a tuple (type, sourceuri, extid) for the entity with id <eid>"""
etype, extid, source = self.repo.type_and_source_from_eid(eid, self)
return {'type': etype, 'source': source, 'extid': extid}
# core method #############################################################
@_open_only
def execute(self, rql, kwargs=None, build_descr=True):
"""db-api like method directly linked to the querier execute method.
See :meth:`cubicweb.dbapi.Cursor.execute` documentation.
"""
self._session_timestamp.touch()
rset = self._execute(self, rql, kwargs, build_descr)
rset.req = self
self._session_timestamp.touch()
return rset
@_open_only
def rollback(self, free_cnxset=None, reset_pool=None):
"""rollback the current transaction"""
if free_cnxset is not None:
warn('[3.21] free_cnxset is now unneeded',
DeprecationWarning, stacklevel=2)
if reset_pool is not None:
warn('[3.13] reset_pool is now unneeded',
DeprecationWarning, stacklevel=2)
cnxset = self.cnxset
assert cnxset is not None
try:
# by default, operations are executed with security turned off
with self.security_enabled(False, False):
while self.pending_operations:
try:
operation = self.pending_operations.pop(0)
operation.handle_event('rollback_event')
except BaseException:
self.critical('rollback error', exc_info=sys.exc_info())
continue
cnxset.rollback()
self.debug('rollback for transaction %s done', self.connectionid)
finally:
self._session_timestamp.touch()
self.clear()
@_open_only
def commit(self, free_cnxset=None, reset_pool=None):
"""commit the current session's transaction"""
if free_cnxset is not None:
warn('[3.21] free_cnxset is now unneeded',
DeprecationWarning, stacklevel=2)
if reset_pool is not None:
warn('[3.13] reset_pool is now unneeded',
DeprecationWarning, stacklevel=2)
assert self.cnxset is not None
cstate = self.commit_state
if cstate == 'uncommitable':
raise QueryError('transaction must be rolled back')
if cstate == 'precommit':
self.warn('calling commit in precommit makes no sense; ignoring commit')
return
if cstate == 'postcommit':
self.critical('postcommit phase is not allowed to write to the db; ignoring commit')
return
assert cstate is None
# 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
debug = server.DEBUG & server.DBG_OPS
try:
# by default, operations are executed with security turned off
with self.security_enabled(False, False):
processed = []
self.commit_state = 'precommit'
if debug:
print(self.commit_state, '*' * 20)
try:
with self.running_hooks_ops():
while self.pending_operations:
operation = self.pending_operations.pop(0)
operation.processed = 'precommit'
processed.append(operation)
if debug:
print(operation)
operation.handle_event('precommit_event')
self.pending_operations[:] = processed
self.debug('precommit transaction %s done', self.connectionid)
except BaseException:
# 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
if debug:
print(self.commit_state, '*' * 20)
with self.running_hooks_ops():
for operation in reversed(processed):
if debug:
print(operation)
try:
operation.handle_event('revertprecommit_event')
except BaseException:
self.critical('error while reverting precommit',
exc_info=True)
# XXX use slice notation since self.pending_operations is a
# read-only property.
self.pending_operations[:] = processed + self.pending_operations
self.rollback()
raise
self.cnxset.commit()
self.commit_state = 'postcommit'
if debug:
print(self.commit_state, '*' * 20)
with self.running_hooks_ops():
while self.pending_operations:
operation = self.pending_operations.pop(0)
if debug:
print(operation)
operation.processed = 'postcommit'
try:
operation.handle_event('postcommit_event')
except BaseException:
self.critical('error while postcommit',
exc_info=sys.exc_info())
self.debug('postcommit transaction %s done', self.connectionid)
return self.transaction_uuid(set=False)
finally:
self._session_timestamp.touch()
self.clear()
# resource accessors ######################################################
@_open_only
def call_service(self, regid, **kwargs):
self.debug('calling service %s', regid)
service = self.vreg['services'].select(regid, self, **kwargs)
return service.call(**kwargs)
@_open_only
def system_sql(self, sql, args=None, rollback_on_failure=True):
"""return a sql cursor on the system database"""
source = self.repo.system_source
try:
return source.doexec(self, sql, args, rollback=rollback_on_failure)
except (source.OperationalError, source.InterfaceError):
if not rollback_on_failure:
raise
source.warning("trying to reconnect")
self.cnxset.reconnect()
return source.doexec(self, sql, args, rollback=rollback_on_failure)
@_open_only
def rtype_eids_rdef(self, rtype, eidfrom, eidto):
# use type_and_source_from_eid instead of type_from_eid for optimization
# (avoid two extra methods call)
subjtype = self.repo.type_and_source_from_eid(eidfrom, self)[0]
objtype = self.repo.type_and_source_from_eid(eidto, self)[0]
return self.vreg.schema.rschema(rtype).rdefs[(subjtype, objtype)]
def cnx_attr(attr_name, writable=False):
"""return a property to forward attribute access to connection.
This is to be used by session"""
args = {}
@deprecated('[3.19] use a Connection object instead')
def attr_from_cnx(session):
return getattr(session._cnx, attr_name)
args['fget'] = attr_from_cnx
if writable:
@deprecated('[3.19] use a Connection object instead')
def write_attr(session, value):
return setattr(session._cnx, attr_name, value)
args['fset'] = write_attr
return property(**args)
class Timestamp(object):
def __init__(self):
self.value = time()
def touch(self):
self.value = time()
def __float__(self):
return float(self.value)
class Session(object):
"""Repository user session
This ties all together:
* session id,
* user,
* other session data.
"""
def __init__(self, user, repo, cnxprops=None, _id=None):
self.sessionid = _id or make_uid(unormalize(user.login))
self.user = user # XXX repoapi: deprecated and store only a login.
self.repo = repo
self.vreg = repo.vreg
self._timestamp = Timestamp()
self.data = {}
self.closed = False
def close(self):
self.closed = True
def __enter__(self):
return self
def __exit__(self, *args):
pass
def __unicode__(self):
return '<session %s (%s 0x%x)>' % (
unicode(self.user.login), self.sessionid, id(self))
@property
def timestamp(self):
return float(self._timestamp)
@property
@deprecated('[3.19] session.id is deprecated, use session.sessionid')
def id(self):
return self.sessionid
@property
def login(self):
return self.user.login
def new_cnx(self):
"""Return a new Connection object linked to the session
The returned Connection will *not* be managed by the Session.
"""
return Connection(self)
@deprecated('[3.19] use a Connection object instead')
def get_option_value(self, option, foreid=None):
if foreid is not None:
warn('[3.19] foreid argument is deprecated', DeprecationWarning,
stacklevel=2)
return self.repo.get_option_value(option)
def _touch(self):
"""update latest session usage timestamp and reset mode to read"""
self._timestamp.touch()
local_perm_cache = cnx_attr('local_perm_cache')
@local_perm_cache.setter
def local_perm_cache(self, value):
#base class assign an empty dict:-(
assert value == {}
pass
# deprecated ###############################################################
@property
def anonymous_session(self):
# XXX for now, anonymous_user only exists in webconfig (and testconfig).
# It will only be present inside all-in-one instance.
# there is plan to move it down to global config.
if not hasattr(self.repo.config, 'anonymous_user'):
# not a web or test config, no anonymous user
return False
return self.user.login == self.repo.config.anonymous_user()[0]
@deprecated('[3.13] use getattr(session.rtype_eids_rdef(rtype, eidfrom, eidto), prop)')
def schema_rproperty(self, rtype, eidfrom, eidto, rprop):
return getattr(self.rtype_eids_rdef(rtype, eidfrom, eidto), rprop)
# 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
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, lang='en'):
self.eid = -1
self.login = u'__internal_manager__'
self.properties = {}
self.groups = set(['managers'])
self.lang = lang
def matching_groups(self, groups):
return 1
def is_in_group(self, group):
return True
def owns(self, eid):
return True
def property_value(self, key):
if key == 'ui.language':
return self.lang
return None
def prefered_language(self, language=None):
# mock CWUser.prefered_language, mainly for testing purpose
return self.property_value('ui.language')
# CWUser compat for notification ###########################################
def name(self):
return ''
class _IEmailable:
@staticmethod
def get_email():
return ''
def cw_adapt_to(self, iface):
if iface == 'IEmailable':
return self._IEmailable
return None
from logging import getLogger
from cubicweb import set_log_methods
set_log_methods(Session, getLogger('cubicweb.session'))
set_log_methods(Connection, getLogger('cubicweb.session'))