2 # Functions for interacting with the nodegroups table in the database
4 # Mark Huang <mlhuang@cs.princeton.edu>
5 # Copyright (C) 2006 The Trustees of Princeton University
7 # $Id: NodeGroups.py,v 1.11 2006/10/03 19:25:30 mlhuang Exp $
10 from types import StringTypes
12 from PLC.Faults import *
13 from PLC.Parameter import Parameter
14 from PLC.Debug import profile
15 from PLC.Table import Row, Table
16 from PLC.Nodes import Node, Nodes
20 Representation of a row in the nodegroups table. To use, optionally
21 instantiate with a dict of values. Update as you would a
22 dict. Commit to the database with sync().
25 table_name = 'nodegroups'
26 primary_key = 'nodegroup_id'
28 'nodegroup_id': Parameter(int, "Node group identifier"),
29 'name': Parameter(str, "Node group name", max = 50),
30 'description': Parameter(str, "Node group description", max = 200),
31 'node_ids': Parameter([int], "List of nodes in this node group"),
34 def __init__(self, api, fields = {}):
35 Row.__init__(self, fields)
38 def validate_name(self, name):
39 # Remove leading and trailing spaces
42 # Make sure name is not blank after we removed the spaces
44 raise PLCInvalidArgument, "Invalid node group name"
46 # Make sure node group does not alredy exist
47 conflicts = NodeGroups(self.api, [name])
48 for nodegroup_id in conflicts:
49 if 'nodegroup_id' not in self or self['nodegroup_id'] != nodegroup_id:
50 raise PLCInvalidArgument, "Node group name already in use"
54 def add_node(self, node, commit = True):
56 Add node to existing nodegroup.
59 assert 'nodegroup_id' in self
60 assert isinstance(node, Node)
61 assert 'node_id' in node
63 node_id = node['node_id']
64 nodegroup_id = self['nodegroup_id']
66 if node_id not in self['node_ids']:
67 assert nodegroup_id not in node['nodegroup_ids']
69 self.api.db.do("INSERT INTO nodegroup_node (nodegroup_id, node_id)" \
70 " VALUES(%(nodegroup_id)d, %(node_id)d)",
76 self['node_ids'].append(node_id)
77 node['nodegroup_ids'].append(nodegroup_id)
79 def remove_node(self, node, commit = True):
81 Remove node from existing nodegroup.
84 assert 'nodegroup_id' in self
85 assert isinstance(node, Node)
86 assert 'node_id' in node
88 node_id = node['node_id']
89 nodegroup_id = self['nodegroup_id']
91 if node_id in self['node_ids']:
92 assert nodegroup_id in node['nodegroup_ids']
94 self.api.db.do("DELETE FROM nodegroup_node" \
95 " WHERE nodegroup_id = %(nodegroup_id)d" \
96 " AND node_id = %(node_id)d",
102 self['node_ids'].remove(node_id)
103 node['nodegroup_ids'].remove(nodegroup_id)
105 def delete(self, commit = True):
107 Delete existing nodegroup from the database.
110 assert 'nodegroup_id' in self
112 # Clean up miscellaneous join tables
113 for table in ['nodegroup_node', 'nodegroups']:
114 self.api.db.do("DELETE FROM %s" \
115 " WHERE nodegroup_id = %d" % \
116 (table, self['nodegroup_id']), self)
121 class NodeGroups(Table):
123 Representation of row(s) from the nodegroups table in the
127 def __init__(self, api, nodegroup_id_or_name_list = None):
130 sql = "SELECT %s FROM view_nodegroups" % \
131 ", ".join(NodeGroup.fields)
133 if nodegroup_id_or_name_list:
134 # Separate the list into integers and strings
135 nodegroup_ids = filter(lambda nodegroup_id: isinstance(nodegroup_id, (int, long)),
136 nodegroup_id_or_name_list)
137 names = filter(lambda name: isinstance(name, StringTypes),
138 nodegroup_id_or_name_list)
139 sql += " WHERE (False"
141 sql += " OR nodegroup_id IN (%s)" % ", ".join(map(str, nodegroup_ids))
143 sql += " OR name IN (%s)" % ", ".join(api.db.quote(names))
146 rows = self.api.db.selectall(sql)
149 self[row['nodegroup_id']] = nodegroup = NodeGroup(api, row)
150 for aggregate in ['node_ids']:
151 if not nodegroup.has_key(aggregate) or nodegroup[aggregate] is None:
152 nodegroup[aggregate] = []
154 nodegroup[aggregate] = map(int, nodegroup[aggregate].split(','))