diff options
Diffstat (limited to 'xenserver/usr_share_openvswitch_scripts_ovs-external-ids')
| -rwxr-xr-x | xenserver/usr_share_openvswitch_scripts_ovs-external-ids | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/xenserver/usr_share_openvswitch_scripts_ovs-external-ids b/xenserver/usr_share_openvswitch_scripts_ovs-external-ids new file mode 100755 index 000000000..fc27aaae1 --- /dev/null +++ b/xenserver/usr_share_openvswitch_scripts_ovs-external-ids @@ -0,0 +1,282 @@ +#!/usr/bin/python +# Copyright (c) 2009, 2010 Nicira Networks +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at: +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + + +# A daemon to monitor the external_ids columns of the Bridge and +# Interface OVSDB tables. Its primary responsibility is to set the +# "bridge-id" and "iface-id" keys in the Bridge and Interface tables, +# respectively. It also looks for the use of "network-uuids" in the +# Bridge table and duplicates its value to the preferred "xs-network-uuids". + +import getopt +import logging, logging.handlers +import os +import signal +import subprocess +import sys +import time + +import XenAPI + +from ovs.db import error +from ovs.db import types +import ovs.util +import ovs.daemon +import ovs.db.idl + +s_log = logging.getLogger("ovs-external-ids") +l_handler = logging.handlers.SysLogHandler( + "/dev/log", + facility=logging.handlers.SysLogHandler.LOG_DAEMON) +l_formatter = logging.Formatter('%(filename)s: %(levelname)s: %(message)s') +l_handler.setFormatter(l_formatter) +s_log.addHandler(l_handler) + +vsctl="/usr/bin/ovs-vsctl" +session = None +force_run = False + +# Set up a session to interact with XAPI. +# +# On system start-up, OVS comes up before XAPI, so we can't log into the +# session until later. Try to do this on-demand, since we won't +# actually do anything interesting until XAPI is up. +def init_session(): + global session + if session is not None: + return True + + try: + session = XenAPI.xapi_local() + session.xenapi.login_with_password("", "") + except: + session = None + s_log.warning("Couldn't login to XAPI") + return False + + return True + +# By default, the "bridge-id" external id in the Bridge table is the +# same as "xs-network-uuids". This may be overridden by defining a +# "nicira-bridge-id" key in the "other_config" field of the network +# record of XAPI. +def get_bridge_id(br_name, default=None): + if not init_session(): + s_log.warning("Failed to get bridge id %s because" + " XAPI session could not be initialized" % br_name) + return default + + for n in session.xenapi.network.get_all(): + rec = session.xenapi.network.get_record(n) + if rec['bridge'] != br_name: + continue + return rec['other_config'].get('nicira-bridge-id', default) + +# By default, the "iface-id" external id in the Interface table is the +# same as "xs-vif-uuid". This may be overridden by defining a +# "nicira-iface-id" key in the "other_config" field of the VIF +# record of XAPI. +def get_iface_id(if_name, default=None): + if not if_name.startswith("vif"): + return default + + domain,device = if_name.strip("vif").split(".") + + if not init_session(): + s_log.warning("Failed to get interface id %s because" + " XAPI session could not be initialized" % if_name) + return default + + for n in session.xenapi.VM.get_all(): + if session.xenapi.VM.get_domid(n) == domain: + vifs = session.xenapi.VM.get_VIFs(n) + for vif in vifs: + rec = session.xenapi.VIF.get_record(vif) + if rec['device'] == device: + return rec['other_config'].get('nicira-iface-id', default) + return None + + +def set_external_id(table, record, key, value): + col = 'external-ids:"' + key + '"="' + value + '"' + cmd = [vsctl, "--timeout=30", "-vANY:console:emer", "set", table, record, col] + exitcode = subprocess.call(cmd) + if exitcode != 0: + s_log.warning("Couldn't call ovs-vsctl") + +# XAPI on XenServer 5.6 uses the external-id "network-uuids" for internal +# networks, but we now prefer "xs-network-uuids". Look for its use and +# write our preferred external-id. +def update_network_uuids(name, ids): + if ids["network-uuids"] and not ids["xs-network-uuids"]: + set_external_id("Bridge", name, "xs-network-uuids", + ids["network-uuids"]) + +def update_bridge_id(name, ids): + id = get_bridge_id(name, ids.get("xs-network-uuids")) + + if not id: + return + + primary_id = id.split(";")[0] + + if ids.get("bridge-id") != primary_id: + set_external_id("Bridge", name, "bridge-id", primary_id) + +def update_iface_id(name, ids): + id = get_iface_id(name, ids.get("xs-vif-uuid")) + if ids.get("iface-id") != id and id: + set_external_id("Interface", name, "iface-id", id) + +def keep_table_columns(schema, table_name, column_types): + table = schema.tables.get(table_name) + if not table: + raise error.Error("schema has no %s table" % table_name) + + new_columns = {} + for column_name, column_type in column_types.iteritems(): + column = table.columns.get(column_name) + if not column: + raise error.Error("%s table schema lacks %s column" + % (table_name, column_name)) + if column.type != column_type: + raise error.Error("%s column in %s table has type \"%s\", " + "expected type \"%s\"" + % (column_name, table_name, + column.type.toEnglish(), + column_type.toEnglish())) + new_columns[column_name] = column + table.columns = new_columns + return table + +def monitor_uuid_schema_cb(schema): + string_type = types.Type(types.BaseType(types.StringType)) + string_map_type = types.Type(types.BaseType(types.StringType), + types.BaseType(types.StringType), + 0, sys.maxint) + + new_tables = {} + for table_name in ("Bridge", "Interface"): + new_tables[table_name] = keep_table_columns( + schema, table_name, {"name": string_type, + "external_ids": string_map_type}) + schema.tables = new_tables + +def usage(): + print "usage: %s [OPTIONS] DATABASE" % sys.argv[0] + print "where DATABASE is a socket on which ovsdb-server is listening." + ovs.daemon.usage() + print "Other options:" + print " -h, --help display this help message" + sys.exit(0) + +def handler(signum, frame): + global force_run + if (signum == signal.SIGHUP): + force_run = True + +def main(argv): + global force_run + + try: + options, args = getopt.gnu_getopt( + argv[1:], 'h', ['help'] + ovs.daemon.LONG_OPTIONS) + except getopt.GetoptError, geo: + sys.stderr.write("%s: %s\n" % (ovs.util.PROGRAM_NAME, geo.msg)) + sys.exit(1) + + for key, value in options: + if key in ['-h', '--help']: + usage() + elif not ovs.daemon.parse_opt(key, value): + sys.stderr.write("%s: unhandled option %s\n" + % (ovs.util.PROGRAM_NAME, key)) + sys.exit(1) + + if len(args) != 1: + sys.stderr.write("%s: exactly one nonoption argument is required " + "(use --help for help)\n" % ovs.util.PROGRAM_NAME) + sys.exit(1) + + ovs.daemon.die_if_already_running() + + remote = args[0] + idl = ovs.db.idl.Idl(remote, "Open_vSwitch", monitor_uuid_schema_cb) + + ovs.daemon.daemonize() + + # This daemon is usually started before XAPI, but to complete our + # tasks, we need it. Wait here until it's up. + while not os.path.exists("/var/run/xapi_init_complete.cookie"): + time.sleep(1) + + signal.signal(signal.SIGHUP, handler) + + bridges = {} + interfaces = {} + while True: + if not force_run and not idl.run(): + poller = ovs.poller.Poller() + idl.wait(poller) + poller.block() + continue + + if force_run: + s_log.info("Forced to re-run as the result of a SIGHUP") + bridges = {} + interfaces = {} + force_run = False + + new_bridges = {} + for rec in idl.data["Bridge"].itervalues(): + name = rec.name.as_scalar() + xs_network_uuids = rec.external_ids.get("xs-network-uuids") + network_uuids = rec.external_ids.get("network-uuids") + new_bridges[name] = {"xs-network-uuids": xs_network_uuids, + "network-uuids": network_uuids} + + new_interfaces = {} + for rec in idl.data["Interface"].itervalues(): + name = rec.name.as_scalar() + xs_vif_uuid = rec.external_ids.get("xs-vif-uuid") + new_interfaces[name] = {"xs-vif-uuid": xs_vif_uuid} + + if bridges != new_bridges: + for name,ids in new_bridges.items(): + # Network uuids shouldn't change in the life of a bridge, + # so only check for "network-uuids" on creation. + if name not in bridges: + update_network_uuids(name, ids) + + if (name not in bridges) or (bridges[name] != ids): + update_bridge_id(name, ids) + + bridges = new_bridges + + if interfaces != new_interfaces: + for name,ids in new_interfaces.items(): + if (name not in interfaces) or (interfaces[name] != ids): + update_iface_id(name, ids) + interfaces = new_interfaces + +if __name__ == '__main__': + try: + main(sys.argv) + except SystemExit: + # Let system.exit() calls complete normally + raise + except: + s_log.exception("traceback") + sys.exit(ovs.daemon.RESTART_EXIT_CODE) |