server/pool.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Fri, 26 Feb 2010 13:24:47 +0100
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"""CubicWeb server connections pool : the repository has a limited number of
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connections pools, each of them dealing with a set of connections on each source
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used by the repository. A connections pools (`ConnectionsPool`) is an
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abstraction for a group of connection to each source.
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:organization: Logilab
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:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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import sys
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class ConnectionsPool(object):
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    """handle connections on a set of sources, at some point associated to a
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    user session
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    """
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    def __init__(self, sources):
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        # dictionnary of (source, connection), indexed by sources'uri
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        self.source_cnxs = {}
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        for source in sources:
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            self.source_cnxs[source.uri] = (source, source.get_connection())
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        if not 'system' in self.source_cnxs:
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            self.source_cnxs['system'] = self.source_cnxs[sources[0].uri]
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        self._cursors = {}
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    def __getitem__(self, uri):
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        """subscription notation provide access to sources'cursors"""
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        try:
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            cursor = self._cursors[uri]
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        except KeyError:
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            cursor = self.source_cnxs[uri][1].cursor()
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            if cursor is not None:
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                # None possible on sources without cursor support such as ldap
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                self._cursors[uri] = cursor
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        return cursor
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    def commit(self):
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        """commit the current transaction for this user"""
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        # FIXME: what happends if a commit fail
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        # would need a two phases commit or like, but I don't know how to do
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        # this using the db-api...
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        for source, cnx in self.source_cnxs.values():
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            # let exception propagates
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            cnx.commit()
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    def rollback(self):
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        """rollback the current transaction for this user"""
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        for source, cnx in self.source_cnxs.values():
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            # catch exceptions, rollback other sources anyway
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            try:
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                cnx.rollback()
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            except:
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                source.critical('rollback error', exc_info=sys.exc_info())
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    def close(self, i_know_what_i_do=False):
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        """close all connections in the pool"""
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        if i_know_what_i_do is not True: # unexpected closing safety belt
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            raise RuntimeError('pool shouldn\'t be closed')
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        for cu in self._cursors.values():
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            try:
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                cu.close()
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            except:
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                continue
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        for _, cnx in self.source_cnxs.values():
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            try:
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                cnx.close()
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            except:
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                continue
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    # internals ###############################################################
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    def pool_set(self):
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        """pool is being set"""
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        self.check_connections()
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    def pool_reset(self):
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        """pool is being reseted"""
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        for source, cnx in self.source_cnxs.values():
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            source.pool_reset(cnx)
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    def sources(self):
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        """return the source objects handled by this pool"""
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        # implementation details of flying insert requires the system source
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        # first
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        yield self.source_cnxs['system'][0]
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        for uri, (source, cnx) in self.source_cnxs.items():
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            if uri == 'system':
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                continue
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            yield source
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        #return [source_cnx[0] for source_cnx in self.source_cnxs.values()]
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    def source(self, uid):
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        """return the source object with the given uri"""
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        return self.source_cnxs[uid][0]
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    def connection(self, uid):
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        """return the connection on the source object with the given uri"""
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        return self.source_cnxs[uid][1]
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    def reconnect(self, source=None):
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        """reopen a connection for this source or all sources if none specified
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        """
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        if source is None:
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            sources = self.sources()
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        else:
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            sources = (source,)
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        for source in sources:
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            try:
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                # properly close existing connection if any
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                self.source_cnxs[source.uri][1].close()
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            except:
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                pass
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            source.info('trying to reconnect')
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            self.source_cnxs[source.uri] = (source, source.get_connection())
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            self._cursors.pop(source.uri, None)
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    def check_connections(self):
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        for source, cnx in self.source_cnxs.itervalues():
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            newcnx = source.check_connection(cnx)
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            if newcnx is not None:
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                self.reset_connection(source, newcnx)
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    def reset_connection(self, source, cnx):
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        self.source_cnxs[source.uri] = (source, cnx)
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        self._cursors.pop(source.uri, None)
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2835
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from cubicweb.server.hook import (Operation, LateOperation, SingleOperation,
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                                  SingleLastOperation)
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from logilab.common.deprecation import class_moved, class_renamed
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Operation = class_moved(Operation)
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PreCommitOperation = class_renamed('PreCommitOperation', Operation)
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LateOperation = class_moved(LateOperation)
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SingleOperation = class_moved(SingleOperation)
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SingleLastOperation = class_moved(SingleLastOperation)