2 # Functions for interacting with the nodes table in the database
4 # Mark Huang <mlhuang@cs.princeton.edu>
5 # Copyright (C) 2006 The Trustees of Princeton University
7 # $Id: Nodes.py,v 1.6 2006/10/02 15:21:03 mlhuang Exp $
10 from types import StringTypes
13 from PLC.Faults import *
14 from PLC.Parameter import Parameter
15 from PLC.Debug import profile
16 from PLC.Table import Row, Table
17 from PLC.NodeNetworks import NodeNetwork, NodeNetworks
18 from PLC.BootStates import BootStates
22 Representation of a row in the nodes table. To use, optionally
23 instantiate with a dict of values. Update as you would a
24 dict. Commit to the database with sync().
28 'node_id': Parameter(int, "Node identifier"),
29 'hostname': Parameter(str, "Fully qualified hostname", max = 255),
30 'site_id': Parameter(int, "Site at which this node is located"),
31 'boot_state': Parameter(str, "Boot state", max = 20),
32 'model': Parameter(str, "Make and model of the actual machine", max = 255),
33 'boot_nonce': Parameter(str, "(Admin only) Random value generated by the node at last boot", max = 128),
34 'version': Parameter(str, "Apparent Boot CD version", max = 64),
35 'ssh_rsa_key': Parameter(str, "Last known SSH host key", max = 1024),
36 'date_created': Parameter(str, "Date and time when node entry was created"),
37 'last_updated': Parameter(str, "Date and time when node entry was created"),
38 'key': Parameter(str, "(Admin only) Node key", max = 256),
39 'session': Parameter(str, "(Admin only) Node session value", max = 256),
40 'nodenetwork_ids': Parameter([int], "List of network interfaces that this node has"),
41 'nodegroup_ids': Parameter([int], "List of node groups that this node is in"),
42 # 'conf_file_ids': Parameter([int], "List of configuration files specific to this node"),
43 # 'root_person_ids': Parameter([int], "(Admin only) List of people who have root access to this node"),
44 'slice_ids': Parameter([int], "List of slices on this node"),
45 # 'pcu_ids': Parameter([int], "List of PCUs that control this node"),
48 def __init__(self, api, fields):
49 Row.__init__(self, fields)
52 def validate_hostname(self, hostname):
53 # 1. Each part begins and ends with a letter or number.
54 # 2. Each part except the last can contain letters, numbers, or hyphens.
55 # 3. Each part is between 1 and 64 characters, including the trailing dot.
56 # 4. At least two parts.
57 # 5. Last part can only contain between 2 and 6 letters.
58 good_hostname = r'^([a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?\.)+' \
61 not re.match(good_hostname, hostname, re.IGNORECASE):
62 raise PLCInvalidArgument, "Invalid hostname"
64 conflicts = Nodes(self.api, [hostname])
65 for node_id, node in conflicts.iteritems():
66 if 'node_id' not in self or self['node_id'] != node_id:
67 raise PLCInvalidArgument, "Hostname already in use"
69 # Check for conflicts with a nodenetwork hostname
70 conflicts = NodeNetworks(self.api, [hostname])
71 for nodenetwork_id in conflicts:
72 if 'nodenetwork_ids' not in self or nodenetwork_id not in self['nodenetwork_ids']:
73 raise PLCInvalidArgument, "Hostname already in use"
77 def validate_boot_state(self, boot_state):
78 if boot_state not in BootStates(self.api):
79 raise PLCInvalidArgument, "Invalid boot state"
83 def sync(self, commit = True):
85 Flush changes back to the database.
90 # Fetch a new node_id if necessary
91 if 'node_id' not in self:
92 rows = self.api.db.selectall("SELECT NEXTVAL('nodes_node_id_seq') AS node_id")
94 raise PLCDBError, "Unable to fetch new node_id"
95 self['node_id'] = rows[0]['node_id']
100 # Filter out fields that cannot be set or updated directly
101 nodes_fields = self.api.db.fields('nodes')
102 fields = dict(filter(lambda (key, value): key in nodes_fields,
104 for ro_field in 'date_created', 'last_updated':
105 if ro_field in fields:
108 # Parameterize for safety
110 values = [self.api.db.param(key, value) for (key, value) in fields.items()]
113 # Insert new row in nodes table
114 sql = "INSERT INTO nodes (%s) VALUES (%s)" % \
115 (", ".join(keys), ", ".join(values))
117 # Update existing row in nodes table
118 columns = ["%s = %s" % (key, value) for (key, value) in zip(keys, values)]
119 sql = "UPDATE nodes SET " + \
120 ", ".join(columns) + \
121 " WHERE node_id = %(node_id)d"
123 self.api.db.do(sql, fields)
128 def delete(self, commit = True):
130 Delete existing node.
133 assert 'node_id' in self
135 # Delete all nodenetworks
136 nodenetworks = NodeNetworks(self.api, self['nodenetwork_ids'])
137 for nodenetwork in nodenetworks.values():
138 nodenetwork.delete(commit = False)
140 # Clean up miscellaneous join tables
141 for table in ['nodegroup_node', 'slice_node', 'slice_attribute']:
142 self.api.db.do("DELETE FROM %s" \
143 " WHERE node_id = %d" % \
144 (table, self['node_id']))
147 self['deleted'] = True
152 Representation of row(s) from the nodes table in the
156 def __init__(self, api, node_id_or_hostname_list = None, fields = Node.fields.keys()):
159 sql = "SELECT %s FROM view_nodes WHERE deleted IS False" % \
162 if node_id_or_hostname_list:
163 # Separate the list into integers and strings
164 node_ids = filter(lambda node_id: isinstance(node_id, (int, long)),
165 node_id_or_hostname_list)
166 hostnames = filter(lambda hostname: isinstance(hostname, StringTypes),
167 node_id_or_hostname_list)
170 sql += " OR node_id IN (%s)" % ", ".join(map(str, node_ids))
172 sql += " OR hostname IN (%s)" % ", ".join(api.db.quote(hostnames)).lower()
175 rows = self.api.db.selectall(sql)
178 self[row['node_id']] = node = Node(api, row)
179 for aggregate in ['nodenetwork_ids', 'nodegroup_ids',
180 'conf_file_ids', 'root_person_ids', 'slice_ids',
182 if not node.has_key(aggregate) or node[aggregate] is None:
185 node[aggregate] = map(int, node[aggregate].split(','))