xenserver/etc_xapi.d_plugins_openvswitch-cfg-update

   1 #!/usr/bin/env python
   2 #
   3 # xapi plugin script to update the cache of configuration items in the
   4 # ovs-vswitchd configuration that are managed in the xapi database when
   5 # integrated with Citrix management tools.
   6
   7 # Copyright (C) 2009, 2010 Nicira Networks, Inc.
   8 #
   9 # Licensed under the Apache License, Version 2.0 (the "License");
  10 # you may not use this file except in compliance with the License.
  11 # You may obtain a copy of the License at:
  12 #
  13 #     http://www.apache.org/licenses/LICENSE-2.0
  14 #
  15 # Unless required by applicable law or agreed to in writing, software
  16 # distributed under the License is distributed on an "AS IS" BASIS,
  17 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18 # See the License for the specific language governing permissions and
  19 # limitations under the License.
  20
  21 # TBD: - error handling needs to be improved.  Currently this can leave
  22 # TBD:   the system in a bad state if anything goes wrong.
  23
  24 import XenAPIPlugin
  25 import XenAPI
  26 import os
  27 import subprocess
  28
  29 vsctl="/usr/bin/ovs-vsctl"
  30 cacert_filename="/etc/openvswitch/vswitchd.cacert"
  31
  32 # Delete the CA certificate, so that we go back to boot-strapping mode
  33 def delete_cacert():
  34     try:
  35         os.remove(cacert_filename)
  36     except OSError:
  37         # Ignore error if file doesn't exist
  38         pass
  39
  40 def update(session, args):
  41     pools = session.xenapi.pool.get_all()
  42     # We assume there is only ever one pool...
  43     if len(pools) == 0:
  44         raise XenAPIPlugin.Failure("NO_POOL_FOR_HOST", [])
  45     if len(pools) > 1:
  46         raise XenAPIPlugin.Failure("MORE_THAN_ONE_POOL_FOR_HOST", [])
  47     pool = session.xenapi.pool.get_record(pools[0])
  48     try:
  49         controller = pool["other_config"]["vSwitchController"]
  50     except KeyError, e:
  51         controller = ""
  52     currentController = vswitchCurrentController()
  53     if controller == "" and currentController != "":
  54         delete_cacert()
  55         removeControllerCfg()
  56         return "Successfully removed controller config"
  57     elif controller != currentController:
  58         delete_cacert()
  59         setControllerCfg(controller)
  60         return "Successfully set controller to " + controller
  61     else:
  62         return "No change to configuration"
  63
  64 def vswitchCurrentController():
  65     controller = vswitchCfgQuery(["get", "Open_vSwitch",
  66                                   ".", "managers"]).strip('[]"')
  67     if controller == "":
  68         return controller
  69     if len(controller) < 4 or controller[0:4] != "ssl:":
  70         return controller
  71     else:
  72         return controller.split(':')[1]
  73
  74 def removeControllerCfg():
  75     vswitchCfgMod(["--", "clear", "Open_vSwitch", ".", "managers",
  76                    "--", "del-ssl"])
  77
  78 def setControllerCfg(controller):
  79     vswitchCfgMod(["--", "clear", "Open_vSwitch", ".", "managers",
  80                    "--", "del-ssl",
  81                    "--", "--bootstrap", "set-ssl",
  82                    "/etc/xensource/xapi-ssl.pem",
  83                    cacert_filename,
  84                    "--", "set", "Open_vSwitch", ".",
  85                    'managers="ssl:' + controller + ':6632"'])
  86
  87 def vswitchCfgQuery(action_args):
  88     cmd = [vsctl, "-vANY:console:emer"] + action_args
  89     output = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()
  90     if len(output) == 0 or output[0] == None:
  91         output = ""
  92     else:
  93         output = output[0].strip()
  94     return output
  95
  96 def vswitchCfgMod(action_args):
  97     cmd = [vsctl, "-vANY:console:emer"] + action_args
  98     exitcode = subprocess.call(cmd)
  99     if exitcode != 0:
 100         raise XenAPIPlugin.Failure("VSWITCH_CONFIG_MOD_FAILURE",
 101                                    [ str(exitcode) , str(action_args) ])
 102
 103 if __name__ == "__main__":
 104     XenAPIPlugin.dispatch({"update": update})