add a shutdown handler for the primary master node which :

- refuse any new connection
- refuse any new transaction



git-svn-id: https://svn.erp5.org/repos/neo/branches/prototype3@657 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/master/shutdown.py

+#
+# Copyright (C) 2006-2009  Nexedi SA
+ 
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+import logging
+from neo import protocol
+from neo.master.service import ServiceEventHandler
+
+class ShutdownEventHandler(ServiceEventHandler):
+    """This class deals with events for a shutting down phase."""
+
+
+    def handleRequestNodeIdentification(self, conn, packet, node_type,
+                                        uuid, ip_address, port, name):
+        logging.error('reject any new connection')
+        raise protocol.ProtocolError('cluster is shutting down')
+
+
+    def handleAskPrimaryMaster(self, conn, packet):
+        logging.error('reject any new demand for primary master')
+        raise protocol.ProtocolError('cluster is shutting down')
+
+    @identification_required
+    @restrict_node_types(CLIENT_NODE_TYPE)
+    def handleAskNewTID(self, conn, packet):
+        logging.error('reject any new demand for new tid')
+        raise protocol.ProtocolError('cluster is shutting down')
+