server/sources/__init__.py
author sylvain.thenault@logilab.fr
Wed, 13 May 2009 17:01:25 +0200
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"""cubicweb server sources support
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:organization: Logilab
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:copyright: 2001-2009 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 datetime import datetime, timedelta
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from logging import getLogger
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from cubicweb import set_log_methods
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from cubicweb.server.sqlutils import SQL_PREFIX
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class TimedCache(dict):
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    def __init__(self, ttlm, ttls=0):
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        # time to live in minutes
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        self.ttl = timedelta(0, ttlm*60 + ttls, 0)
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    def __setitem__(self, key, value):
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        dict.__setitem__(self, key, (datetime.now(), value))
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    def __getitem__(self, key):
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        return dict.__getitem__(self, key)[1]
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    def clear_expired(self):
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        now_ = datetime.now()
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        ttl = self.ttl
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        for key, (timestamp, value) in self.items():
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            if now_ - timestamp > ttl:
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                del self[key]
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class AbstractSource(object):
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    """an abstract class for sources"""
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    # boolean telling if modification hooks should be called when something is
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    # modified in this source
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    should_call_hooks = True
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    # boolean telling if the repository should connect to this source during
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    # migration
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    connect_for_migration = True
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    # mappings telling which entities and relations are available in the source
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    # keys are supported entity/relation types and values are boolean indicating
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    # wether the support is read-only (False) or read-write (True)
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    support_entities = {}
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    support_relations = {}
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    # a global identifier for this source, which has to be set by the source
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    # instance
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    uri = None
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    # a reference to the system information helper
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    repo = None
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    # a reference to the application'schema (may differs from the source'schema)
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    schema = None
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    def __init__(self, repo, appschema, source_config, *args, **kwargs):
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        self.repo = repo
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        self.uri = source_config['uri']
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        set_log_methods(self, getLogger('cubicweb.sources.'+self.uri))
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        self.set_schema(appschema)
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        self.support_relations['identity'] = False
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    def init_creating(self):
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        """method called by the repository once ready to create a new instance"""
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        pass
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    def init(self):
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        """method called by the repository once ready to handle request"""
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        pass
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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 clear_eid_cache(self, eid, etype):
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        """clear potential caches for the given eid"""
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        pass
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    def __repr__(self):
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        return '<%s source @%#x>' % (self.uri, id(self))
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    def __cmp__(self, other):
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        """simple comparison function to get predictable source order, with the
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        system source at last
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        """
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        if self.uri == other.uri:
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            return 0
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        if self.uri == 'system':
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            return 1
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        if other.uri == 'system':
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            return -1
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        return cmp(self.uri, other.uri)
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    def set_schema(self, schema):
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        """set the application'schema"""
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        self.schema = schema
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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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        try:
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            wsupport = self.support_entities[etype]
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        except KeyError:
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            return False
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        if write:
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            return wsupport
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        return True
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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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        current implementation return true if the relation is defined into
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        `support_relations` or if it is a final relation of a supported entity
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        type
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        """
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        try:
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            wsupport = self.support_relations[rtype]
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        except KeyError:
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            rschema = self.schema.rschema(rtype)
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            if not rschema.is_final() or rschema == 'has_text':
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                return False
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            for etype in rschema.subjects():
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                try:
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                    wsupport = self.support_entities[etype]
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                    break
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                except KeyError:
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                    continue
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            else:
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                return False
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        if write:
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            return wsupport
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        return True
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0
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    def eid2extid(self, eid, session=None):
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        return self.repo.eid2extid(self, eid, session)
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    def extid2eid(self, value, etype, session=None, **kwargs):
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        return self.repo.extid2eid(self, value, etype, session, **kwargs)
0
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    PUBLIC_KEYS = ('adapter', 'uri')
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    def remove_sensitive_information(self, sourcedef):
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        """remove sensitive information such as login / password from source
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        definition
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        """
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        for key in sourcedef.keys():
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            if not key in self.PUBLIC_KEYS:
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                sourcedef.pop(key)
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    def _cleanup_system_relations(self, session):
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        """remove relation in the system source referencing entities coming from
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        this source
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        """
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        cu = session.system_sql('SELECT eid FROM entities WHERE source=%(uri)s',
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                                {'uri': self.uri})
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        myeids = ','.join(str(r[0]) for r in cu.fetchall())
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        if not myeids:
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            return
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        # delete relations referencing one of those eids
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        eidcolum = SQL_PREFIX + 'eid'
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        for rschema in self.schema.relations():
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            if rschema.is_final() or rschema.type == 'identity':
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                continue
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            if rschema.inlined:
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                column = SQL_PREFIX + rschema.type
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                for subjtype in rschema.subjects():
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                    table = SQL_PREFIX + str(subjtype)
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                    for objtype in rschema.objects(subjtype):
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                        if self.support_entity(objtype):
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                            sql = 'UPDATE %s SET %s=NULL WHERE %s IN (%s);' % (
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                                table, column, eidcolum, myeids)
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                            session.system_sql(sql)
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                            break
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                continue
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            for etype in rschema.subjects():
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                if self.support_entity(etype):
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                    sql = 'DELETE FROM %s_relation WHERE eid_from IN (%s);' % (
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                        rschema.type, myeids)
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                    session.system_sql(sql)
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                    break
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            for etype in rschema.objects():
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                if self.support_entity(etype):
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                    sql = 'DELETE FROM %s_relation WHERE eid_to IN (%s);' % (
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                        rschema.type, myeids)
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                    session.system_sql(sql)
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                    break
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    def cleanup_entities_info(self, session):
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        """cleanup system tables from information for entities coming from
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        this source. This should be called when a source is removed to
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        properly cleanup the database
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        """
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        self._cleanup_system_relations(session)
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        # fti / entities tables cleanup
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        # sqlite doesn't support DELETE FROM xxx USING yyy
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        dbhelper = session.pool.source('system').dbhelper
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        session.system_sql('DELETE FROM %s WHERE %s.%s IN (SELECT eid FROM '
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                           'entities WHERE entities.source=%%(uri)s)'
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                           % (dbhelper.fti_table, dbhelper.fti_table,
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                              dbhelper.fti_uid_attr),
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                           {'uri': self.uri})
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        session.system_sql('DELETE FROM entities WHERE source=%(uri)s',
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                           {'uri': self.uri})
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    # abstract methods to override (at least) in concrete source classes #######
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0
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    def get_connection(self):
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        """open and return a connection to the source"""
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        raise NotImplementedError()
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    def check_connection(self, cnx):
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        """check connection validity, return None if the connection is still valid
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        else a new connection (called when the pool using the given connection is
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        being attached to a session)
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        do nothing by default
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        """
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        pass
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0
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    def pool_reset(self, cnx):
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        """the pool using the given connection is being reseted from its current
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        attached session
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        do nothing by default
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        """
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        pass
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0
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    def authenticate(self, session, login, password):
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        """if the source support CWUser entity type, it should implements
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        this method which should return CWUser eid for the given login/password
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        if this account is defined in this source and valid login / password is
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        given. Else raise `AuthenticationError`
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        """
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        raise NotImplementedError()
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0
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    def syntax_tree_search(self, session, union,
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                           args=None, cachekey=None, varmap=None, debug=0):
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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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        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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        """
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        raise NotImplementedError()
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0
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    def flying_insert(self, table, session, union, args=None, varmap=None):
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        """similar as .syntax_tree_search, but inserts data in the temporary
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        table (on-the-fly if possible, eg for the system source whose the given
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        cursor come from). If not possible, inserts all data by calling
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        .executemany().
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        """
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        res = self.syntax_tree_search(session, union, args, varmap=varmap)
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        session.pool.source('system')._manual_insert(res, table, session)
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0
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    # system source don't have to implement the two methods below
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0
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    def before_entity_insertion(self, session, lid, etype, eid):
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        """called by the repository when an eid has been attributed for an
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        entity stored here but the entity has not been inserted in the system
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        table yet.
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0
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        This method must return the an Entity instance representation of this
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        entity.
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        """
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        entity = self.repo.vreg.etype_class(etype)(session, None)
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        entity.set_eid(eid)
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        return entity
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0
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    def after_entity_insertion(self, session, lid, entity):
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        """called by the repository after an entity stored here has been
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        inserted in the system table.
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        """
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        pass
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    # read-only sources don't have to implement methods below
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    def get_extid(self, entity):
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        """return the external id for the given newly inserted entity"""
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        raise NotImplementedError()
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0
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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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        raise NotImplementedError()
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0
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    def update_entity(self, session, entity):
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        """update an entity in the source"""
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        raise NotImplementedError()
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    def delete_entity(self, session, etype, eid):
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        """delete an entity from the source"""
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        raise NotImplementedError()
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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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        raise NotImplementedError()
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0
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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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        raise NotImplementedError()
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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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        raise NotImplementedError()
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0
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    def create_eid(self, session):
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        raise NotImplementedError()
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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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        raise NotImplementedError()
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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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        raise NotImplementedError()
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0
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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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        raise NotImplementedError()
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0
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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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        raise NotImplementedError()
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0
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    def modified_entities(self, session, etypes, mtime):
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        """return a 2-uple:
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        * list of (etype, eid) of entities of the given types which have been
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          modified since the given timestamp (actually entities whose full text
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          index content has changed)
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        * list of (etype, eid) of entities of the given types which have been
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          deleted since the given timestamp
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        """
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        raise NotImplementedError()
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    # sql system source interface #############################################
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    def sqlexec(self, session, sql, args=None):
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        """execute the query and return its result"""
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   348
        raise NotImplementedError()
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0
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    def temp_table_def(self, selection, solution, table, basemap):
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        raise NotImplementedError()
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0
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    def create_index(self, session, table, column, unique=False):
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        raise NotImplementedError()
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0
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    def drop_index(self, session, table, column, unique=False):
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   357
        raise NotImplementedError()
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   358
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    def create_temp_table(self, session, table, schema):
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   360
        raise NotImplementedError()
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   361
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   362
    def clean_temp_data(self, session, temptables):
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   363
        """remove temporary data, usually associated to temporary tables"""
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diff changeset
   364
        pass
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diff changeset
   365
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0
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   367
class TrFunc(object):
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    """lower, upper"""
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   369
    def __init__(self, trname, index, attrname=None):
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   370
        self._tr = trname.lower()
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   371
        self.index = index
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   372
        self.attrname = attrname
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0
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    def apply(self, resdict):
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   375
        value = resdict.get(self.attrname)
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   376
        if value is not None:
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   377
            return getattr(value, self._tr)()
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   378
        return None
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   379
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   380
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   381
class GlobTrFunc(TrFunc):
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   382
    """count, sum, max, min, avg"""
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diff changeset
   383
    funcs = {
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diff changeset
   384
        'count': len,
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diff changeset
   385
        'sum': sum,
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diff changeset
   386
        'max': max,
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diff changeset
   387
        'min': min,
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diff changeset
   388
        # XXX avg
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   389
        }
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   390
    def apply(self, result):
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diff changeset
   391
        """have to 'groupby' manually. For instance, if we 'count' for index 1:
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diff changeset
   392
        >>> self.apply([(1, 2), (3, 4), (1, 5)])
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diff changeset
   393
        [(1, 7), (3, 4)]
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diff changeset
   394
        """
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parents:
diff changeset
   395
        keys, values = [], {}
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diff changeset
   396
        for row in result:
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diff changeset
   397
            key = tuple(v for i, v in enumerate(row) if i != self.index)
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diff changeset
   398
            value = row[self.index]
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parents:
diff changeset
   399
            try:
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   400
                values[key].append(value)
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parents:
diff changeset
   401
            except KeyError:
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parents:
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   402
                keys.append(key)
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parents:
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   403
                values[key] = [value]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   404
        result = []
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parents:
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   405
        trfunc = self.funcs[self._tr]
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
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   406
        for key in keys:
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parents:
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   407
            row = list(key)
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   408
            row.insert(self.index, trfunc(values[key]))
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parents:
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   409
            result.append(row)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   410
        return result
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   411
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   412
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parents:
diff changeset
   413
class ConnectionWrapper(object):
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parents:
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   414
    def __init__(self, cnx=None):
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   415
        self.cnx = cnx
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   416
    def commit(self):
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   417
        pass
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   418
    def rollback(self):
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   419
        pass
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   420
    def cursor(self):
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   421
        return None # no actual cursor support
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parents:
diff changeset
   422
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parents:
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   423
from cubicweb.server import SOURCE_TYPES
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   424
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   425
def source_adapter(source_config):
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   426
    adapter_type = source_config['adapter'].lower()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   427
    try:
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parents:
diff changeset
   428
        return SOURCE_TYPES[adapter_type]
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parents:
diff changeset
   429
    except KeyError:
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diff changeset
   430
        raise RuntimeError('Unknown adapter %r' % adapter_type)
1792
9eadf34fd860 delete-trailing-spaces
sylvain.thenault@logilab.fr
parents: 1398
diff changeset
   431
0
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parents:
diff changeset
   432
def get_source(source_config, global_schema, repo):
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parents:
diff changeset
   433
    """return a source adapter according to the adapter field in the
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parents:
diff changeset
   434
    source's configuration
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parents:
diff changeset
   435
    """
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parents:
diff changeset
   436
    return source_adapter(source_config)(repo, global_schema, source_config)