2 # Copyright (c) 2009, 2010 Nicira Networks
4 # Licensed under the Apache License, Version 2.0 (the "License");
5 # you may not use this file except in compliance with the License.
6 # You may obtain a copy of the License at:
8 # http://www.apache.org/licenses/LICENSE-2.0
10 # Unless required by applicable law or agreed to in writing, software
11 # distributed under the License is distributed on an "AS IS" BASIS,
12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 # See the License for the specific language governing permissions and
14 # limitations under the License.
17 # A daemon to monitor the external_ids columns of the Bridge and
18 # Interface OVSDB tables. Its primary responsibility is to set the
19 # "bridge-id" and "iface-id" keys in the Bridge and Interface tables,
20 # respectively. It also looks for the use of "network-uuids" in the
21 # Bridge table and duplicates its value to the preferred "xs-network-uuids".
33 from ovs.db import error
34 from ovs.db import types
39 vsctl="/usr/bin/ovs-vsctl"
43 # Set up a session to interact with XAPI.
45 # On system start-up, OVS comes up before XAPI, so we can't log into the
46 # session until later. Try to do this on-demand, since we won't
47 # actually do anything interesting until XAPI is up.
50 if session is not None:
54 session = XenAPI.xapi_local()
55 session.xenapi.login_with_password("", "")
58 syslog.syslog(syslog.LOG_WARNING,
59 "monitor-external-ids: Couldn't login to XAPI")
64 # By default, the "bridge-id" external id in the Bridge table is the
65 # same as "xs-network-uuids". This may be overridden by defining a
66 # "nicira-bridge-id" key in the "other_config" field of the network
68 def get_bridge_id(br_name, default=None):
69 if not init_session():
72 for n in session.xenapi.network.get_all():
73 rec = session.xenapi.network.get_record(n)
74 if rec['bridge'] != br_name:
76 return rec['other_config'].get('nicira-bridge-id', default)
78 # By default, the "iface-id" external id in the Interface table is the
79 # same as "xs-vif-uuid". This may be overridden by defining a
80 # "nicira-iface-id" key in the "other_config" field of the VIF
82 def get_iface_id(if_name, default=None):
83 if not if_name.startswith("vif"):
86 domain,device = if_name.strip("vif").split(".")
88 if not init_session():
91 for n in session.xenapi.VM.get_all():
92 if session.xenapi.VM.get_domid(n) == domain:
93 vifs = session.xenapi.VM.get_VIFs(n)
95 rec = session.xenapi.VIF.get_record(vif)
96 if rec['device'] == device:
97 return rec['other_config'].get('nicira-iface-id', default)
101 def set_external_id(table, record, key, value):
102 col = 'external-ids:"' + key + '"="' + value + '"'
103 cmd = [vsctl, "--timeout=30", "-vANY:console:emer", "set", table, record, col]
104 exitcode = subprocess.call(cmd)
106 syslog.syslog(syslog.LOG_WARNING,
107 "monitor-external-ids: Couldn't call ovs-vsctl")
109 # XAPI on XenServer 5.6 uses the external-id "network-uuids" for internal
110 # networks, but we now prefer "xs-network-uuids". Look for its use and
111 # write our preferred external-id.
112 def update_network_uuids(name, ids):
113 if ids["network-uuids"] and not ids["xs-network-uuids"]:
114 set_external_id("Bridge", name, "xs-network-uuids",
115 ids["network-uuids"])
117 def update_bridge_id(name, ids):
118 id = get_bridge_id(name, ids.get("xs-network-uuids"))
119 if ids.get("bridge-id") != id and id:
120 set_external_id("Bridge", name, "bridge-id", id)
122 def update_iface_id(name, ids):
123 id = get_iface_id(name, ids.get("xs-vif-uuid"))
124 if ids.get("iface-id") != id and id:
125 set_external_id("Interface", name, "iface-id", id)
127 def keep_table_columns(schema, table_name, column_types):
128 table = schema.tables.get(table_name)
130 raise error.Error("schema has no %s table" % table_name)
133 for column_name, column_type in column_types.iteritems():
134 column = table.columns.get(column_name)
136 raise error.Error("%s table schema lacks %s column"
137 % (table_name, column_name))
138 if column.type != column_type:
139 raise error.Error("%s column in %s table has type \"%s\", "
140 "expected type \"%s\""
141 % (column_name, table_name,
142 column.type.toEnglish(),
143 column_type.toEnglish()))
144 new_columns[column_name] = column
145 table.columns = new_columns
148 def monitor_uuid_schema_cb(schema):
149 string_type = types.Type(types.BaseType(types.StringType))
150 string_map_type = types.Type(types.BaseType(types.StringType),
151 types.BaseType(types.StringType),
155 for table_name in ("Bridge", "Interface"):
156 new_tables[table_name] = keep_table_columns(
157 schema, table_name, {"name": string_type,
158 "external_ids": string_map_type})
159 schema.tables = new_tables
162 print "usage: %s [OPTIONS] DATABASE" % sys.argv[0]
163 print "where DATABASE is a socket on which ovsdb-server is listening."
165 print "Other options:"
166 print " -h, --help display this help message"
169 def handler(signum, frame):
171 if (signum == signal.SIGHUP):
178 options, args = getopt.gnu_getopt(
179 argv[1:], 'h', ['help'] + ovs.daemon.LONG_OPTIONS)
180 except getopt.GetoptError, geo:
181 sys.stderr.write("%s: %s\n" % (ovs.util.PROGRAM_NAME, geo.msg))
184 for key, value in options:
185 if key in ['-h', '--help']:
187 elif not ovs.daemon.parse_opt(key, value):
188 sys.stderr.write("%s: unhandled option %s\n"
189 % (ovs.util.PROGRAM_NAME, key))
193 sys.stderr.write("%s: exactly one nonoption argument is required "
194 "(use --help for help)\n" % ovs.util.PROGRAM_NAME)
197 ovs.daemon.die_if_already_running()
200 idl = ovs.db.idl.Idl(remote, "Open_vSwitch", monitor_uuid_schema_cb)
202 ovs.daemon.daemonize()
204 # This daemon is usually started before XAPI, but to complete our
205 # tasks, we need it. Wait here until it's up.
206 while not os.path.exists("/var/run/xapi_init_complete.cookie"):
209 signal.signal(signal.SIGHUP, handler)
214 if not force_run and not idl.run():
215 poller = ovs.poller.Poller()
226 for rec in idl.data["Bridge"].itervalues():
227 name = rec.name.as_scalar()
228 xs_network_uuids = rec.external_ids.get("xs-network-uuids")
229 network_uuids = rec.external_ids.get("network-uuids")
230 new_bridges[name] = {"xs-network-uuids": xs_network_uuids,
231 "network-uuids": network_uuids}
234 for rec in idl.data["Interface"].itervalues():
235 name = rec.name.as_scalar()
236 xs_vif_uuid = rec.external_ids.get("xs-vif-uuid")
237 new_interfaces[name] = {"xs-vif-uuid": xs_vif_uuid}
239 if bridges != new_bridges:
240 for name,ids in new_bridges.items():
241 # Network uuids shouldn't change in the life of a bridge,
242 # so only check for "network-uuids" on creation.
243 if name not in bridges:
244 update_network_uuids(name, ids)
246 if (name not in bridges) or (bridges[name] != ids):
247 update_bridge_id(name, ids)
249 bridges = new_bridges
251 if interfaces != new_interfaces:
252 for name,ids in new_interfaces.items():
253 if (name not in interfaces) or (interfaces[name] != ids):
254 update_iface_id(name, ids)
255 interfaces = new_interfaces
257 if __name__ == '__main__':
260 except error.Error, e:
261 sys.stderr.write("%s\n" % e)