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#!/usr/bin/env python
#
# xapi plugin script to update the cache of configuration items in the
# ovs-vswitchd configuration that are managed in the xapi database when
# integrated with Citrix management tools.
# Copyright (C) 2009, 2010 Nicira Networks, Inc.
#
# 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.
# TBD: - error handling needs to be improved. Currently this can leave
# TBD: the system in a bad state if anything goes wrong.
import XenAPIPlugin
import XenAPI
import os
import subprocess
import syslog
vsctl="/usr/bin/ovs-vsctl"
cacert_filename="/etc/openvswitch/vswitchd.cacert"
# Delete the CA certificate, so that we go back to boot-strapping mode
def delete_cacert():
try:
os.remove(cacert_filename)
except OSError:
# Ignore error if file doesn't exist
pass
def update(session, args):
# Refresh bridge network UUIDs in case this host joined or left a pool.
script = "/opt/xensource/libexec/interface-reconfigure"
try:
retval = subprocess.call([script, "rewrite"])
if retval != 0:
syslog.syslog("%s exited with status %d" % (script, retval))
except OSError, e:
syslog.syslog("%s: failed to execute (%s)" % (script, e.strerror))
pools = session.xenapi.pool.get_all()
# We assume there is only ever one pool...
if len(pools) == 0:
raise XenAPIPlugin.Failure("NO_POOL_FOR_HOST", [])
if len(pools) > 1:
raise XenAPIPlugin.Failure("MORE_THAN_ONE_POOL_FOR_HOST", [])
pool = session.xenapi.pool.get_record(pools[0])
try:
try:
controller = pool["vswitch_controller"]
except KeyError:
# On systems older than XenServer 5.6.0, we needed to store
# the key in "other_config".
controller = pool["other_config"]["vSwitchController"]
except KeyError, e:
controller = ""
currentController = vswitchCurrentController()
if controller == "" and currentController != "":
delete_cacert()
try:
emergency_reset(session, None)
except:
pass
removeControllerCfg()
return "Successfully removed controller config"
elif controller != currentController:
delete_cacert()
try:
emergency_reset(session, None)
except:
pass
setControllerCfg(controller)
return "Successfully set controller to " + controller
else:
return "No change to configuration"
def vswitchCurrentController():
controller = vswitchCfgQuery(["get", "Open_vSwitch",
".", "managers"]).strip('[]"')
if controller == "":
return controller
if len(controller) < 4 or controller[0:4] != "ssl:":
return controller
else:
return controller.split(':')[1]
def removeControllerCfg():
vswitchCfgMod(["--", "clear", "Open_vSwitch", ".", "managers",
"--", "del-ssl"])
def setControllerCfg(controller):
# /etc/xensource/xapi-ssl.pem is mentioned twice below because it
# contains both the private key and the certificate.
vswitchCfgMod(["--", "clear", "Open_vSwitch", ".", "managers",
"--", "del-ssl",
"--", "--bootstrap", "set-ssl",
"/etc/xensource/xapi-ssl.pem",
"/etc/xensource/xapi-ssl.pem",
cacert_filename,
"--", "set", "Open_vSwitch", ".",
'managers="ssl:' + controller + ':6632"'])
def vswitchCfgQuery(action_args):
cmd = [vsctl, "-vANY:console:emer"] + action_args
output = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()
if len(output) == 0 or output[0] == None:
output = ""
else:
output = output[0].strip()
return output
def vswitchCfgMod(action_args):
cmd = [vsctl, "-vANY:console:emer"] + action_args
exitcode = subprocess.call(cmd)
if exitcode != 0:
raise XenAPIPlugin.Failure("VSWITCH_CONFIG_MOD_FAILURE",
[ str(exitcode) , str(action_args) ])
def emergency_reset(session, args):
cmd = [vsctl, "emer-reset"]
exitcode = subprocess.call(cmd)
if exitcode != 0:
raise XenAPIPlugin.Failure("VSWITCH_EMER_RESET_FAILURE",
[ str(exitcode) ])
return "Successfully reset configuration"
if __name__ == "__main__":
XenAPIPlugin.dispatch({"update": update,
"emergency_reset": emergency_reset})
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