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".
24 import logging, logging.handlers
33 from ovs.db import error
34 from ovs.db import types
39 s_log = logging.getLogger("ovs-external-ids")
40 l_handler = logging.handlers.RotatingFileHandler(
41 "/var/log/openvswitch/ovs-external-ids.log")
42 l_formatter = logging.Formatter('%(filename)s: %(levelname)s: %(message)s')
43 l_handler.setFormatter(l_formatter)
44 s_log.addHandler(l_handler)
45 s_log.setLevel(logging.INFO)
47 vsctl="/usr/bin/ovs-vsctl"
51 # Set up a session to interact with XAPI.
53 # On system start-up, OVS comes up before XAPI, so we can't log into the
54 # session until later. Try to do this on-demand, since we won't
55 # actually do anything interesting until XAPI is up.
58 if session is not None:
62 session = XenAPI.xapi_local()
63 session.xenapi.login_with_password("", "")
66 s_log.warning("Couldn't login to XAPI")
71 def get_network_by_bridge(br_name):
72 if not init_session():
73 s_log.warning("Failed to get bridge id %s because"
74 " XAPI session could not be initialized" % br_name)
77 for n in session.xenapi.network.get_all():
78 rec = session.xenapi.network.get_record(n)
79 if rec['bridge'] == br_name:
84 # By default, the "bridge-id" external id in the Bridge table is the
85 # same as "xs-network-uuids". This may be overridden by defining a
86 # "nicira-bridge-id" key in the "other_config" field of the network
87 # record of XAPI. If nicira-bridge-id is undefined returns default.
88 # On error returns None.
89 def get_bridge_id(br_name, default=None):
90 rec = get_network_by_bridge(br_name)
92 return rec['other_config'].get('nicira-bridge-id', default)
95 # By default, the "iface-id" external id in the Interface table is the
96 # same as "xs-vif-uuid". This may be overridden by defining a
97 # "nicira-iface-id" key in the "other_config" field of the VIF
99 def get_iface_id(if_name, xs_vif_uuid):
100 if not if_name.startswith("vif"):
101 # Treat whatever was passed into 'xs_vif_uuid' as a default
102 # value for non-VIFs.
105 if not init_session():
106 s_log.warning("Failed to get interface id %s because"
107 " XAPI session could not be initialized" % if_name)
111 vif = session.xenapi.VIF.get_by_uuid(xs_vif_uuid)
112 rec = session.xenapi.VIF.get_record(vif)
113 return rec['other_config'].get('nicira-iface-id', xs_vif_uuid)
114 except XenAPI.Failure:
115 s_log.warning("Could not find XAPI entry for VIF %s" % if_name)
118 def call_vsctl(args):
119 cmd = [vsctl, "--timeout=30", "-vANY:console:emer"] + args
120 exitcode = subprocess.call(cmd)
122 s_log.warning("Couldn't call ovs-vsctl")
124 def set_external_id(table, record, key, value):
125 col = 'external-ids:"' + key + '"="' + value + '"'
126 call_vsctl(["set", table, record, col])
128 # XAPI on XenServer 5.6 uses the external-id "network-uuids" for internal
129 # networks, but we now prefer "xs-network-uuids". Look for its use and
130 # write our preferred external-id.
131 def update_network_uuids(name, ids):
132 if ids["network-uuids"] and not ids["xs-network-uuids"]:
133 set_external_id("Bridge", name, "xs-network-uuids",
134 ids["network-uuids"])
136 def update_fail_mode(name):
137 rec = get_network_by_bridge(name)
142 fail_mode = rec['other_config'].get('vswitch-controller-fail-mode')
145 pools = session.xenapi.pool.get_all()
147 prec = session.xenapi.pool.get_record(pools[0])
148 fail_mode = prec['other_config'].get('vswitch-controller-fail-mode')
150 if fail_mode not in ['standalone', 'secure']:
151 fail_mode = 'standalone'
153 call_vsctl(["set", "bridge", name, "fail_mode=" + fail_mode])
155 def update_bridge_id(name, ids):
156 id = get_bridge_id(name, ids.get("xs-network-uuids"))
161 primary_id = id.split(";")[0]
163 if ids.get("bridge-id") != primary_id:
164 set_external_id("Bridge", name, "bridge-id", primary_id)
166 def update_iface_id(name, ids):
167 id = get_iface_id(name, ids.get("xs-vif-uuid"))
168 if ids.get("iface-id") != id and id:
169 set_external_id("Interface", name, "iface-id", id)
171 def keep_table_columns(schema, table_name, column_types):
172 table = schema.tables.get(table_name)
174 raise error.Error("schema has no %s table" % table_name)
177 for column_name, column_type in column_types.iteritems():
178 column = table.columns.get(column_name)
180 raise error.Error("%s table schema lacks %s column"
181 % (table_name, column_name))
182 if column.type != column_type:
183 raise error.Error("%s column in %s table has type \"%s\", "
184 "expected type \"%s\""
185 % (column_name, table_name,
186 column.type.toEnglish(),
187 column_type.toEnglish()))
188 new_columns[column_name] = column
189 table.columns = new_columns
192 def monitor_uuid_schema_cb(schema):
193 string_type = types.Type(types.BaseType(types.StringType))
194 string_map_type = types.Type(types.BaseType(types.StringType),
195 types.BaseType(types.StringType),
199 for table_name in ("Bridge", "Interface"):
200 new_tables[table_name] = keep_table_columns(
201 schema, table_name, {"name": string_type,
202 "external_ids": string_map_type})
203 schema.tables = new_tables
206 print "usage: %s [OPTIONS] DATABASE" % sys.argv[0]
207 print "where DATABASE is a socket on which ovsdb-server is listening."
209 print "Other options:"
210 print " -h, --help display this help message"
213 def handler(signum, frame):
215 if (signum == signal.SIGHUP):
222 options, args = getopt.gnu_getopt(
223 argv[1:], 'h', ['help'] + ovs.daemon.LONG_OPTIONS)
224 except getopt.GetoptError, geo:
225 sys.stderr.write("%s: %s\n" % (ovs.util.PROGRAM_NAME, geo.msg))
228 for key, value in options:
229 if key in ['-h', '--help']:
231 elif not ovs.daemon.parse_opt(key, value):
232 sys.stderr.write("%s: unhandled option %s\n"
233 % (ovs.util.PROGRAM_NAME, key))
237 sys.stderr.write("%s: exactly one nonoption argument is required "
238 "(use --help for help)\n" % ovs.util.PROGRAM_NAME)
241 ovs.daemon.die_if_already_running()
244 idl = ovs.db.idl.Idl(remote, "Open_vSwitch", monitor_uuid_schema_cb)
246 ovs.daemon.daemonize()
248 # This daemon is usually started before XAPI, but to complete our
249 # tasks, we need it. Wait here until it's up.
250 while not os.path.exists("/var/run/xapi_init_complete.cookie"):
253 signal.signal(signal.SIGHUP, handler)
258 if not force_run and not idl.run():
259 poller = ovs.poller.Poller()
265 s_log.info("Forced to re-run as the result of a SIGHUP")
271 for rec in idl.data["Bridge"].itervalues():
272 name = rec.name.as_scalar()
273 xs_network_uuids = rec.external_ids.get("xs-network-uuids")
274 network_uuids = rec.external_ids.get("network-uuids")
275 new_bridges[name] = {"xs-network-uuids": xs_network_uuids,
276 "network-uuids": network_uuids}
279 for rec in idl.data["Interface"].itervalues():
280 name = rec.name.as_scalar()
281 xs_vif_uuid = rec.external_ids.get("xs-vif-uuid")
282 new_interfaces[name] = {"xs-vif-uuid": xs_vif_uuid}
284 if bridges != new_bridges:
285 for name,ids in new_bridges.items():
286 # Network uuids shouldn't change in the life of a bridge,
287 # so only check for "network-uuids" on creation.
288 if name not in bridges:
289 update_network_uuids(name, ids)
290 update_fail_mode(name)
292 if (name not in bridges) or (bridges[name] != ids):
293 update_bridge_id(name, ids)
295 bridges = new_bridges
297 if interfaces != new_interfaces:
298 for name,ids in new_interfaces.items():
299 if (name not in interfaces) or (interfaces[name] != ids):
300 update_iface_id(name, ids)
301 interfaces = new_interfaces
303 if __name__ == '__main__':
307 # Let system.exit() calls complete normally
310 s_log.exception("traceback")
311 sys.exit(ovs.daemon.RESTART_EXIT_CODE)