# copyright 2003-2012 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/>.
"""Server subcube of cubicweb : defines objects used only on the server
(repository) side
The server module contains functions to initialize a new repository.
"""
__docformat__ = "restructuredtext en"
import sys
from os.path import join, exists
from glob import glob
from contextlib import contextmanager
from logilab.common.modutils import LazyObject
from logilab.common.textutils import splitstrip
from logilab.common.registry import yes
from logilab import database
from yams import BASE_GROUPS
from cubicweb import CW_SOFTWARE_ROOT
from cubicweb.appobject import AppObject
class ShuttingDown(BaseException):
"""raised when trying to access some resources while the repository is
shutting down. Inherit from BaseException so that `except Exception` won't
catch it.
"""
# server-side services #########################################################
class Service(AppObject):
"""Base class for services.
A service is a selectable object that performs an action server-side.
Use :class:`cubicweb.dbapi.Connection.call_service` to call them from
the web-side.
When inheriting this class, do not forget to define at least the __regid__
attribute (and probably __select__ too).
"""
__registry__ = 'services'
__select__ = yes()
def call(self, **kwargs):
raise NotImplementedError
# server-side debugging ########################################################
# server debugging flags. They may be combined using binary operators.
#:no debug information
DBG_NONE = 0 #: no debug information
#: rql execution information
DBG_RQL = 1
#: executed sql
DBG_SQL = 2
#: repository events
DBG_REPO = 4
#: multi-sources
DBG_MS = 8
#: hooks
DBG_HOOKS = 16
#: operations
DBG_OPS = 32
#: security
DBG_SEC = 64
#: more verbosity
DBG_MORE = 128
#: all level enabled
DBG_ALL = DBG_RQL + DBG_SQL + DBG_REPO + DBG_MS + DBG_HOOKS + DBG_OPS + DBG_SEC + DBG_MORE
_SECURITY_ITEMS = []
_SECURITY_CAPS = ['read', 'add', 'update', 'delete']
#: current debug mode
DEBUG = 0
@contextmanager
def tunesecurity(items=(), capabilities=()):
"""Context manager to use in conjunction with DBG_SEC.
This allows some tuning of:
* the monitored capabilities ('read', 'add', ....)
* the object being checked by the security checkers
When no item is given, all of them will be watched.
By default all capabilities are monitored, unless specified.
Example use::
from cubicweb.server import debugged, DBG_SEC, tunesecurity
with debugged(DBG_SEC):
with tunesecurity(items=('Elephant', 'trumps'),
capabilities=('update', 'delete')):
babar.cw_set(trumps=celeste)
flore.cw_delete()
==>
check_perm: 'update' 'relation Elephant.trumps.Elephant'
[(ERQLExpression(Any X WHERE U has_update_permission X, X eid %(x)s, U eid %(u)s),
{'eid': 2167}, True)]
check_perm: 'delete' 'Elephant'
[(ERQLExpression(Any X WHERE U has_delete_permission X, X eid %(x)s, U eid %(u)s),
{'eid': 2168}, True)]
"""
olditems = _SECURITY_ITEMS[:]
_SECURITY_ITEMS.extend(list(items))
oldactions = _SECURITY_CAPS[:]
_SECURITY_CAPS[:] = capabilities
yield
_SECURITY_ITEMS[:] = olditems
_SECURITY_CAPS[:] = oldactions
def set_debug(debugmode):
"""change the repository debugging mode"""
global DEBUG
if not debugmode:
DEBUG = 0
return
if isinstance(debugmode, basestring):
for mode in splitstrip(debugmode, sep='|'):
DEBUG |= globals()[mode]
else:
DEBUG |= debugmode
class debugged(object):
"""Context manager and decorator to help debug the repository.
It can be used either as a context manager:
>>> with debugged('DBG_RQL | DBG_REPO'):
... # some code in which you want to debug repository activity,
... # seing information about RQL being executed an repository events.
or as a function decorator:
>>> @debugged('DBG_RQL | DBG_REPO')
... def some_function():
... # some code in which you want to debug repository activity,
... # seing information about RQL being executed an repository events
The debug mode will be reset to its original value when leaving the "with"
block or the decorated function.
"""
def __init__(self, debugmode):
self.debugmode = debugmode
self._clevel = None
def __enter__(self):
"""enter with block"""
self._clevel = DEBUG
set_debug(self.debugmode)
def __exit__(self, exctype, exc, traceback):
"""leave with block"""
set_debug(self._clevel)
return traceback is None
def __call__(self, func):
"""decorate function"""
def wrapped(*args, **kwargs):
_clevel = DEBUG
set_debug(self.debugmode)
try:
return func(*args, **kwargs)
finally:
set_debug(self._clevel)
return wrapped
# database initialization ######################################################
def create_user(session, login, pwd, *groups):
# monkey patch this method if you want to customize admin/anon creation
# (that maybe necessary if you change CWUser's schema)
user = session.create_entity('CWUser', login=login, upassword=pwd)
for group in groups:
session.execute('SET U in_group G WHERE U eid %(u)s, G name %(group)s',
{'u': user.eid, 'group': group})
return user
def init_repository(config, interactive=True, drop=False, vreg=None):
"""initialise a repository database by creating tables add filling them
with the minimal set of entities (ie at least the schema, base groups and
a initial user)
"""
from cubicweb.dbapi import in_memory_repo_cnx
from cubicweb.server.repository import Repository
from cubicweb.server.utils import manager_userpasswd
from cubicweb.server.sqlutils import sqlexec, sqlschema, sql_drop_all_user_tables
from cubicweb.server.sqlutils import _SQL_DROP_ALL_USER_TABLES_FILTER_FUNCTION as drop_filter
# configuration to avoid db schema loading and user'state checking
# on connection
config.creating = True
config.consider_user_state = False
config.cubicweb_appobject_path = set(('hooks', 'entities'))
config.cube_appobject_path = set(('hooks', 'entities'))
# only enable the system source at initialization time
repo = Repository(config, vreg=vreg)
schema = repo.schema
sourcescfg = config.sources()
source = sourcescfg['system']
driver = source['db-driver']
sqlcnx = repo.system_source.get_connection()
sqlcursor = sqlcnx.cursor()
execute = sqlcursor.execute
if drop:
helper = database.get_db_helper(driver)
dropsql = sql_drop_all_user_tables(helper, sqlcursor)
# We may fail dropping some tables because of table dependencies, in a first pass.
# So, we try a second drop sequence to drop remaining tables if needed.
# Note that 2 passes is an arbitrary choice as it seems enougth for our usecases.
# (looping may induce infinite recursion when user have no right for example)
# Here we try to keep code simple and backend independant. That why we don't try to
# distinguish remaining tables (wrong right, dependencies, ...).
failed = sqlexec(dropsql, execute, cnx=sqlcnx,
pbtitle='-> dropping tables (first pass)')
if failed:
failed = sqlexec(failed, execute, cnx=sqlcnx,
pbtitle='-> dropping tables (second pass)')
remainings = filter(drop_filter, helper.list_tables(sqlcursor))
assert not remainings, 'Remaining tables: %s' % ', '.join(remainings)
_title = '-> creating tables '
print _title,
# schema entities and relations tables
# can't skip entities table even if system source doesn't support them,
# they are used sometimes by generated sql. Keeping them empty is much
# simpler than fixing this...
schemasql = sqlschema(schema, driver)
#skip_entities=[str(e) for e in schema.entities()
# if not repo.system_source.support_entity(str(e))])
failed = sqlexec(schemasql, execute, pbtitle=_title, delimiter=';;')
if failed:
print 'The following SQL statements failed. You should check your schema.'
print failed
raise Exception('execution of the sql schema failed, you should check your schema')
sqlcursor.close()
sqlcnx.commit()
sqlcnx.close()
session = repo.internal_session()
# insert entity representing the system source
ssource = session.create_entity('CWSource', type=u'native', name=u'system')
repo.system_source.eid = ssource.eid
session.execute('SET X cw_source X WHERE X eid %(x)s', {'x': ssource.eid})
# insert base groups and default admin
print '-> inserting default user and default groups.'
try:
login = unicode(sourcescfg['admin']['login'])
pwd = sourcescfg['admin']['password']
except KeyError:
if interactive:
msg = 'enter login and password of the initial manager account'
login, pwd = manager_userpasswd(msg=msg, confirm=True)
else:
login, pwd = unicode(source['db-user']), source['db-password']
# sort for eid predicatability as expected in some server tests
for group in sorted(BASE_GROUPS):
session.create_entity('CWGroup', name=unicode(group))
admin = create_user(session, login, pwd, 'managers')
session.execute('SET X owned_by U WHERE X is IN (CWGroup,CWSource), U eid %(u)s',
{'u': admin.eid})
session.commit()
session.close()
repo.shutdown()
# reloging using the admin user
config._cubes = None # avoid assertion error
repo, cnx = in_memory_repo_cnx(config, login, password=pwd)
repo.system_source.eid = ssource.eid # redo this manually
assert len(repo.sources) == 1, repo.sources
handler = config.migration_handler(schema, interactive=False,
cnx=cnx, repo=repo)
# install additional driver specific sql files
handler.cmd_install_custom_sql_scripts()
for cube in reversed(config.cubes()):
handler.cmd_install_custom_sql_scripts(cube)
# serialize the schema
initialize_schema(config, schema, handler)
# yoo !
cnx.commit()
repo.system_source.init_creating()
cnx.commit()
cnx.close()
repo.shutdown()
# restore initial configuration
config.creating = False
config.consider_user_state = True
# (drop instance attribute to get back to class attribute)
del config.cubicweb_appobject_path
del config.cube_appobject_path
print '-> database for instance %s initialized.' % config.appid
def initialize_schema(config, schema, mhandler, event='create'):
from cubicweb.server.schemaserial import serialize_schema
session = mhandler.session
cubes = config.cubes()
# deactivate every hooks but those responsible to set metadata
# so, NO INTEGRITY CHECKS are done, to have quicker db creation.
# Active integrity is kept else we may pb such as two default
# workflows for one entity type.
with session.deny_all_hooks_but('metadata', 'activeintegrity'):
# execute cubicweb's pre<event> script
mhandler.cmd_exec_event_script('pre%s' % event)
# execute cubes pre<event> script if any
for cube in reversed(cubes):
mhandler.cmd_exec_event_script('pre%s' % event, cube)
# execute instance's pre<event> script (useful in tests)
mhandler.cmd_exec_event_script('pre%s' % event, apphome=True)
# enter instance'schema into the database
session.set_cnxset()
serialize_schema(session, schema)
# execute cubicweb's post<event> script
mhandler.cmd_exec_event_script('post%s' % event)
# execute cubes'post<event> script if any
for cube in reversed(cubes):
mhandler.cmd_exec_event_script('post%s' % event, cube)
# execute instance's post<event> script (useful in tests)
mhandler.cmd_exec_event_script('post%s' % event, apphome=True)
# sqlite'stored procedures have to be registered at connection opening time
from logilab.database import SQL_CONNECT_HOOKS
# add to this set relations which should have their add security checking done
# *BEFORE* adding the actual relation (done after by default)
BEFORE_ADD_RELATIONS = set(('owned_by',))
# add to this set relations which should have their add security checking done
# *at COMMIT TIME* (done after by default)
ON_COMMIT_ADD_RELATIONS = set(())
# available sources registry
SOURCE_TYPES = {'native': LazyObject('cubicweb.server.sources.native', 'NativeSQLSource'),
'datafeed': LazyObject('cubicweb.server.sources.datafeed', 'DataFeedSource'),
'ldapfeed': LazyObject('cubicweb.server.sources.ldapfeed', 'LDAPFeedSource'),
'pyrorql': LazyObject('cubicweb.server.sources.pyrorql', 'PyroRQLSource'),
'zmqrql': LazyObject('cubicweb.server.sources.zmqrql', 'ZMQRQLSource'),
}