server/sources/extlite.py
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Tue, 27 Jan 2009 20:51:55 +0100
changeset 489 21183fc36b39
parent 257 4c7d3af7e94d
child 983 cf1caf460081
child 1137 9ce0ac82f94f
permissions -rw-r--r--
[tabs] * provide the required json controller there * stuff back in the lazy tab construction mechanism, with some documentation bits
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"""provide an abstract class for external sources using a sqlite database helper
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:organization: Logilab
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:copyright: 2007-2008 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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import time
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import threading
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from os.path import join, exists
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from cubicweb import server
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from cubicweb.server.sqlutils import sqlexec, SQLAdapterMixIn
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from cubicweb.server.sources import AbstractSource, native
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from cubicweb.server.sources.rql2sql import SQLGenerator
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def timeout_acquire(lock, timeout):
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    while not lock.acquire(False):
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        time.sleep(0.2)
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        timeout -= 0.2
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        if timeout <= 0:
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            raise RuntimeError("svn source is busy, can't acquire connection lock")
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class ConnectionWrapper(object):
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    def __init__(self, source=None):
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        self.source = source
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        self._cnx = None
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    @property
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    def cnx(self):
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        if self._cnx is None:
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            timeout_acquire(self.source._cnxlock, 5)
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            self._cnx = self.source._sqlcnx
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        return self._cnx
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    def commit(self):
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        if self._cnx is not None:
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            self._cnx.commit()
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    def rollback(self):
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        if self._cnx is not None:
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            self._cnx.rollback()
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    def cursor(self):
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        return self.cnx.cursor()
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class SQLiteAbstractSource(AbstractSource):
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    """an abstract class for external sources using a sqlite database helper
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    """
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    sqlgen_class = SQLGenerator
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    @classmethod
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    def set_nonsystem_types(cls):
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        # those entities are only in this source, we don't want them in the
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        # system source
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        for etype in cls.support_entities:
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            native.NONSYSTEM_ETYPES.add(etype)
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        for rtype in cls.support_relations:
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            native.NONSYSTEM_RELATIONS.add(rtype)
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    options = (
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        ('helper-db-path',
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         {'type' : 'string',
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          'default': None,
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          'help': 'path to the sqlite database file used to do queries on the \
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repository.',
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          'inputlevel': 2,
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          }),
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    )
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    def __init__(self, repo, appschema, source_config, *args, **kwargs):
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        # the helper db is used to easy querying and will store everything but
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        # actual file content 
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        dbpath = source_config.get('helper-db-path')
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        if dbpath is None:
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            dbpath = join(repo.config.appdatahome,
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                          '%(uri)s.sqlite' % source_config)
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        self.dbpath = dbpath
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        self.sqladapter = SQLAdapterMixIn({'db-driver': 'sqlite',
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                                           'db-name': dbpath})
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        # those attributes have to be initialized before ancestor's __init__
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        # which will call set_schema
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        self._need_sql_create = not exists(dbpath)
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        self._need_full_import = self._need_sql_create
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        AbstractSource.__init__(self, repo, appschema, source_config,
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                                *args, **kwargs)
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        # sql database can only be accessed by one connection at a time, and a
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        # connection can only be used by the thread which created it so:
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        # * create the connection when needed
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        # * use a lock to be sure only one connection is used
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        self._cnxlock = threading.Lock()
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    @property
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    def _sqlcnx(self):
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        # XXX: sqlite connections can only be used in the same thread, so
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        #      create a new one each time necessary. If it appears to be time
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        #      consuming, find another way
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        return self.sqladapter.get_connection()
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    def _is_schema_complete(self):
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        for etype in self.support_entities:
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            if not etype in self.schema:
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                self.warning('not ready to generate %s database, %s support missing from schema',
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                             self.uri, etype)
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                return False
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        for rtype in self.support_relations:
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            if not rtype in self.schema:
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                self.warning('not ready to generate %s database, %s support missing from schema',
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                             self.uri, rtype)
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                return False
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        return True
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    def _create_database(self):
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        from yams.schema2sql import eschema2sql, rschema2sql
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        from cubicweb.toolsutils import restrict_perms_to_user
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        self.warning('initializing sqlite database for %s source' % self.uri)
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        cnx = self._sqlcnx
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        cu = cnx.cursor()
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        schema = self.schema
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        for etype in self.support_entities:
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            eschema = schema.eschema(etype)
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            createsqls = eschema2sql(self.sqladapter.dbhelper, eschema,
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                                     skip_relations=('data',))
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            sqlexec(createsqls, cu, withpb=False)
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        for rtype in self.support_relations:
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            rschema = schema.rschema(rtype)
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   129
            if not rschema.inlined:
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   130
                sqlexec(rschema2sql(rschema), cu, withpb=False)
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        cnx.commit()
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        cnx.close()
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        self._need_sql_create = False
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   134
        if self.repo.config['uid']:
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   135
            from logilab.common.shellutils import chown
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            # database file must be owned by the uid of the server process
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            self.warning('set %s as owner of the database file',
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                         self.repo.config['uid'])
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   139
            chown(self.dbpath, self.repo.config['uid'])
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        restrict_perms_to_user(self.dbpath, self.info)
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   141
        
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    def set_schema(self, schema):
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        super(SQLiteAbstractSource, self).set_schema(schema)
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   144
        if self._need_sql_create and self._is_schema_complete():
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            self._create_database()
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        self.rqlsqlgen = self.sqlgen_class(schema, self.sqladapter.dbhelper)
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    def get_connection(self):
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        return ConnectionWrapper(self)
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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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   155
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        always return the connection to reset eventually cached cursor
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   157
        """
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   158
        return cnx
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   159
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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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   162
        attached session: release the connection lock if the connection wrapper
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        has a connection set
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   164
        """
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   165
        if cnx._cnx is not None:
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            try:
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                cnx._cnx.close()
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                cnx._cnx = None
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            finally:
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                self._cnxlock.release()
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   171
        
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   172
    def syntax_tree_search(self, session, union,
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                           args=None, cachekey=None, varmap=None, debug=0):
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   174
        """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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   176
        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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   178
        """
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   179
        if self._need_sql_create:
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   180
            return []
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   181
        sql, query_args = self.rqlsqlgen.generate(union, args)
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   182
        if server.DEBUG:
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   183
            print self.uri, 'SOURCE RQL', union.as_string()
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   184
            print 'GENERATED SQL', sql
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   185
        args = self.sqladapter.merge_args(args, query_args)
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   186
        cursor = session.pool[self.uri]
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   187
        cursor.execute(sql, args)
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   188
        return self.sqladapter.process_result(cursor) 
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   189
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   190
    def local_add_entity(self, session, entity):
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   191
        """insert the entity in the local database.
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parents:
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   192
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   193
        This is not provided as add_entity implementation since usually source
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   194
        don't want to simply do this, so let raise NotImplementedError and the
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   195
        source implementor may use this method if necessary
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   196
        """
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   197
        cu = session.pool[self.uri]
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   198
        attrs = self.sqladapter.preprocess_entity(entity)
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   199
        sql = self.sqladapter.sqlgen.insert(str(entity.e_schema), attrs)
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   200
        cu.execute(sql, attrs)
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   201
        
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   202
    def add_entity(self, session, entity):
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   203
        """add a new entity to the source"""
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   204
        raise NotImplementedError()
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   205
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   206
    def local_update_entity(self, session, entity):
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diff changeset
   207
        """update an entity in the source
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parents:
diff changeset
   208
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diff changeset
   209
        This is not provided as update_entity implementation since usually
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parents:
diff changeset
   210
        source don't want to simply do this, so let raise NotImplementedError
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diff changeset
   211
        and the source implementor may use this method if necessary
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parents:
diff changeset
   212
        """
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   213
        cu = session.pool[self.uri]
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parents:
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   214
        attrs = self.sqladapter.preprocess_entity(entity)
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parents:
diff changeset
   215
        sql = self.sqladapter.sqlgen.update(str(entity.e_schema), attrs, ['eid'])
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parents:
diff changeset
   216
        cu.execute(sql, attrs)
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parents:
diff changeset
   217
        
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   218
    def update_entity(self, session, entity):
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   219
        """update an entity in the source"""
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   220
        raise NotImplementedError()
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   221
        
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   222
    def delete_entity(self, session, etype, eid):
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   223
        """delete an entity from the source
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parents:
diff changeset
   224
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   225
        this is not deleting a file in the svn but deleting entities from the
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parents:
diff changeset
   226
        source. Main usage is to delete repository content when a Repository
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   227
        entity is deleted.
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   228
        """
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   229
        sqlcursor = session.pool[self.uri]        
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   230
        attrs = {'eid': eid}
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   231
        sql = self.sqladapter.sqlgen.delete(etype, attrs)
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parents:
diff changeset
   232
        sqlcursor.execute(sql, attrs)
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parents:
diff changeset
   233
    
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   234
    def delete_relation(self, session, subject, rtype, object):
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   235
        """delete a relation from the source"""
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parents:
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   236
        rschema = self.schema.rschema(rtype)
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   237
        if rschema.inlined:
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   238
            if subject in session.query_data('pendingeids', ()):
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diff changeset
   239
                return
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   240
            etype = session.describe(subject)[0]
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parents:
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   241
            sql = 'UPDATE %s SET %s=NULL WHERE eid=%%(eid)s' % (etype, rtype)
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parents:
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   242
            attrs = {'eid' : subject}
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parents:
diff changeset
   243
        else:
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parents:
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   244
            attrs = {'eid_from': subject, 'eid_to': object}
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parents:
diff changeset
   245
            sql = self.sqladapter.sqlgen.delete('%s_relation' % rtype, attrs)
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parents:
diff changeset
   246
        sqlcursor = session.pool[self.uri]        
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parents:
diff changeset
   247
        sqlcursor.execute(sql, attrs)