goa/gaesource.py
author sylvain.thenault@logilab.fr
Mon, 23 Mar 2009 17:55:59 +0100
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"""Adapter for google appengine source.
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:organization: Logilab
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:copyright: 2008-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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from cubicweb import AuthenticationError, UnknownEid
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from cubicweb.server.sources import AbstractSource, ConnectionWrapper
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from cubicweb.server.pool import SingleOperation
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from cubicweb.server.utils import crypt_password
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from cubicweb.goa.dbinit import set_user_groups
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from cubicweb.goa.rqlinterpreter import RQLInterpreter
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from google.appengine.api.datastore import Key, Entity, Put, Delete
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from google.appengine.api import datastore_errors, users
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def _init_groups(guser, euser):
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    # set default groups
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    if guser is None:
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        groups = ['guests']
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    else:
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        groups = ['users']
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        if users.is_current_user_admin():
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            groups.append('managers')
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    set_user_groups(euser, groups)
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def _clear_related_cache(session, gaesubject, rtype, gaeobject):
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    subject, object = str(gaesubject.key()), str(gaeobject.key())
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    for eid, role in ((subject, 'subject'), (object, 'object')):
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        # clear related cache if necessary
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        try:
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            entity = session.entity_cache(eid)
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        except KeyError:
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            pass
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        else:
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            entity.clear_related_cache(rtype, role)
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    if gaesubject.kind() == 'EUser':
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        for asession in session.repo._sessions.itervalues():
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            if asession.user.eid == subject:
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                asession.user.clear_related_cache(rtype, 'subject')
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    if gaeobject.kind() == 'EUser':
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        for asession in session.repo._sessions.itervalues():
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            if asession.user.eid == object:
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                asession.user.clear_related_cache(rtype, 'object')
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def _mark_modified(session, gaeentity):
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    modified = session.query_data('modifiedentities', {}, setdefault=True)
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    modified[str(gaeentity.key())] = gaeentity
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    DatastorePutOp(session)
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def _rinfo(session, subject, rtype, object):
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    gaesubj = session.datastore_get(subject)
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    gaeobj = session.datastore_get(object)
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    rschema = session.vreg.schema.rschema(rtype)
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    cards = rschema.rproperty(gaesubj.kind(), gaeobj.kind(), 'cardinality')
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    return gaesubj, gaeobj, cards
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def _radd(session, gaeentity, targetkey, relation, card):
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    if card in '?1':
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        gaeentity[relation] = targetkey
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    else:
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        try:
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            related = gaeentity[relation]
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        except KeyError:
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            related = []
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        else:
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            if related is None:
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                related = []
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        related.append(targetkey)
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        gaeentity[relation] = related
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    _mark_modified(session, gaeentity)
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def _rdel(session, gaeentity, targetkey, relation, card):
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    if card in '?1':
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        gaeentity[relation] = None
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    else:
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        related = gaeentity[relation]
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        if related is not None:
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            related = [key for key in related if not key == targetkey]
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            gaeentity[relation] = related or None
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    _mark_modified(session, gaeentity)
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class DatastorePutOp(SingleOperation):
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    """delayed put of entities to have less datastore write api calls
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    * save all modified entities at precommit (should be the first operation
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      processed, hence the 0 returned by insert_index())
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    * in case others precommit operations modify some entities, resave modified
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      entities at commit. This suppose that no db changes will occurs during
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      commit event but it should be the case.
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    """
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    def insert_index(self):
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        return 0
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    def _put_entities(self):
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        pending = self.session.query_data('pendingeids', ())
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        modified = self.session.query_data('modifiedentities', {})
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        for eid, gaeentity in modified.iteritems():
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            assert not eid in pending
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            Put(gaeentity)
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        modified.clear()
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    def commit_event(self):
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        self._put_entities()
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    def precommit_event(self):
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        self._put_entities()
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class GAESource(AbstractSource):
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    """adapter for a system source on top of google appengine datastore"""
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    passwd_rql = "Any P WHERE X is EUser, X login %(login)s, X upassword P"
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    auth_rql = "Any X WHERE X is EUser, X login %(login)s, X upassword %(pwd)s"
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    _sols = ({'X': 'EUser', 'P': 'Password'},)
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    options = ()
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    def __init__(self, repo, appschema, source_config, *args, **kwargs):
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        AbstractSource.__init__(self, repo, appschema, source_config,
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                                *args, **kwargs)
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        if repo.config['use-google-auth']:
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            self.info('using google authentication service')
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            self.authenticate = self.authenticate_gauth
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        else:
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            self.authenticate = self.authenticate_local
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    def reset_caches(self):
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        """method called during test to reset potential source caches"""
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        pass
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    def init_creating(self):
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        pass
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    def init(self):
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        # XXX unregister unsupported hooks
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        from cubicweb.server.hooks import sync_owner_after_add_composite_relation
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        self.repo.hm.unregister_hook(sync_owner_after_add_composite_relation,
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                                     'after_add_relation', '')
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    def get_connection(self):
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        return ConnectionWrapper()
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    # ISource interface #######################################################
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    def compile_rql(self, rql):
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        rqlst = self.repo.querier._rqlhelper.parse(rql)
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        rqlst.restricted_vars = ()
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        rqlst.children[0].solutions = self._sols
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        return rqlst
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    def set_schema(self, schema):
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        """set the application'schema"""
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        self.interpreter = RQLInterpreter(schema)
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        self.schema = schema
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        if 'EUser' in schema and not self.repo.config['use-google-auth']:
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            # rql syntax trees used to authenticate users
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            self._passwd_rqlst = self.compile_rql(self.passwd_rql)
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            self._auth_rqlst = self.compile_rql(self.auth_rql)
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    def support_entity(self, etype, write=False):
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        """return true if the given entity's type is handled by this adapter
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        if write is true, return true only if it's a RW support
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        """
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        return True
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   170
    
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    def support_relation(self, rtype, write=False):
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        """return true if the given relation's type is handled by this adapter
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        if write is true, return true only if it's a RW support
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        """
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        return True
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    def authenticate_gauth(self, session, login, password):
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        guser = users.get_current_user()
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        # allowing or not anonymous connection should be done in the app.yaml
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        # file, suppose it's authorized if we are there
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        if guser is None:
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            login = u'anonymous'
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        else:
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            login = unicode(guser.nickname())
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        # XXX http://code.google.com/appengine/docs/users/userobjects.html
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        # use a reference property to automatically work with email address
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        # changes after the propagation feature is implemented
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        key = Key.from_path('EUser', 'key_' + login, parent=None)
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        try:
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            euser = session.datastore_get(key)
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            # XXX fix user. Required until we find a better way to fix broken records
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   192
            if not euser.get('s_in_group'):
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   193
                _init_groups(guser, euser)
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   194
                Put(euser)
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   195
            return str(key)
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   196
        except datastore_errors.EntityNotFoundError:
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   197
            # create a record for this user
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            euser = Entity('EUser', name='key_' + login)
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            euser['s_login'] = login
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            _init_groups(guser, euser)
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            Put(euser)
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   202
            return str(euser.key())
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   203
        
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    def authenticate_local(self, session, login, password):
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        """return EUser eid for the given login/password if this account is
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        defined in this source, else raise `AuthenticationError`
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   207
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        two queries are needed since passwords are stored crypted, so we have
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        to fetch the salt first
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        """
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        args = {'login': login, 'pwd' : password}
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   212
        if password is not None:
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            rset = self.syntax_tree_search(session, self._passwd_rqlst, args)
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            try:
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                pwd = rset[0][0]
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   216
            except IndexError:
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                raise AuthenticationError('bad login')
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            # passwords are stored using the bytea type, so we get a StringIO
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            if pwd is not None:
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                args['pwd'] = crypt_password(password, pwd[:2])
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   221
        # get eid from login and (crypted) password
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        rset = self.syntax_tree_search(session, self._auth_rqlst, args)
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   223
        try:
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   224
            return rset[0][0]
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   225
        except IndexError:
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   226
            raise AuthenticationError('bad password')
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   227
    
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   228
    def syntax_tree_search(self, session, union, args=None, cachekey=None, 
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                           varmap=None):
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        """return result from this source for a rql query (actually from a rql
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        syntax tree and a solution dictionary mapping each used variable to a
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   232
        possible type). If cachekey is given, the query necessary to fetch the
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        results (but not the results themselves) may be cached using this key.
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   234
        """
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   235
        results, description = self.interpreter.interpret(union, args,
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   236
                                                          session.datastore_get)
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   237
        return results # XXX description
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   238
                
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   239
    def flying_insert(self, table, session, union, args=None, varmap=None):
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        raise NotImplementedError
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   241
    
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    def add_entity(self, session, entity):
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        """add a new entity to the source"""
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        # do not delay add_entity as other modifications, new created entity
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        # needs an eid
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   246
        entity.put()
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   247
        
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    def update_entity(self, session, entity):
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   249
        """replace an entity in the source"""
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   250
        gaeentity = entity.to_gae_model()
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        _mark_modified(session, entity.to_gae_model())
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        if gaeentity.kind() == 'EUser':
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   253
            for asession in self.repo._sessions.itervalues():
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   254
                if asession.user.eid == entity.eid:
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   255
                    asession.user.update(dict(gaeentity))
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   256
                
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   257
    def delete_entity(self, session, etype, eid):
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   258
        """delete an entity from the source"""
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   259
        # do not delay delete_entity as other modifications to ensure
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   260
        # consistency
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   261
        key = Key(eid)
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   262
        Delete(key)
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        session.clear_datastore_cache(key)
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        session.drop_entity_cache(eid)
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        session.query_data('modifiedentities', {}).pop(eid, None)
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    def add_relation(self, session, subject, rtype, object):
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        """add a relation to the source"""
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        gaesubj, gaeobj, cards = _rinfo(session, subject, rtype, object)
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        _radd(session, gaesubj, gaeobj.key(), 's_' + rtype, cards[0])
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        _radd(session, gaeobj, gaesubj.key(), 'o_' + rtype, cards[1])
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        _clear_related_cache(session, gaesubj, rtype, gaeobj)
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    def delete_relation(self, session, subject, rtype, object):
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        """delete a relation from the source"""
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        gaesubj, gaeobj, cards = _rinfo(session, subject, rtype, object)
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        pending = session.query_data('pendingeids', set(), setdefault=True)
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        if not subject in pending:
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            _rdel(session, gaesubj, gaeobj.key(), 's_' + rtype, cards[0])
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        if not object in pending:
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            _rdel(session, gaeobj, gaesubj.key(), 'o_' + rtype, cards[1])
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        _clear_related_cache(session, gaesubj, rtype, gaeobj)
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    # system source interface #################################################
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    def eid_type_source(self, session, eid):
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        """return a tuple (type, source, extid) for the entity with id <eid>"""
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        try:
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            key = Key(eid)
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        except datastore_errors.BadKeyError:
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            raise UnknownEid(eid)
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        return key.kind(), 'system', None
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    def create_eid(self, session):
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        return None # let the datastore generating key
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    def add_info(self, session, entity, source, extid=None):
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        """add type and source info for an eid into the system table"""
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        pass
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    def delete_info(self, session, eid, etype, uri, extid):
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        """delete system information on deletion of an entity by transfering
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        record from the entities table to the deleted_entities table
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        """
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        pass
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    def fti_unindex_entity(self, session, eid):
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        """remove text content for entity with the given eid from the full text
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        index
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        """
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        pass
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    def fti_index_entity(self, session, entity):
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        """add text content of a created/modified entity to the full text index
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        """
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        pass
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