plugins/omf_resctl.py

   1 #
   2 # $Id$
   3 # $URL$
   4 #
   5 # NodeManager plugin - first step of handling omf_controlled slices
   6
   7 """
   8 Overwrites the 'resctl' tag of slivers controlled by OMF so slivermanager.py does the right thing
   9 """
  10
  11 import os
  12 import glob
  13 import subprocess
  14
  15 import tools
  16 import logger
  17
  18 priority = 50
  19
  20 def start(options, conf):
  21     logger.log("omf_resctl: plugin starting up...")
  22
  23 def GetSlivers(data, conf = None, plc = None):
  24     if 'accounts' not in data:
  25         logger.log_missing_data("omf_resctl.GetSlivers",'accounts')
  26         return
  27
  28     try:
  29         xmpp_server=data['xmpp']['server']
  30     except:
  31         # disabled feature - bailing out
  32         # xxx might need to clean up more deeply..
  33         return
  34
  35     # as hrn is set only at AddNode-time, upgraded myplcs might still miss this
  36     # clue: just overwrite the hostname of all nodes
  37     # for node in GetNodes(): UpdateNode(node['node_id'],{'hostname':node['hostname']})
  38     try:
  39         node_hrn = data['hrn']
  40         if not hrn: raise Exception,"Empty hrn"
  41     except:
  42         node_hrn='default   # Failed to read hrn from GetSlivers, please upgrade PLCAPI'
  43
  44     for sliver in data['slivers']:
  45         name=sliver['name']
  46         for chunk in sliver['attributes']:
  47             if chunk['tagname']=='omf_control':
  48                 # scan all versions of omf-resctl
  49                 etc_path="/vservers/%s/etc/"%name
  50                 pattern = etc_path + "omf-resctl-*/omf-resctl.yaml.in"
  51                 templates = glob.glob (pattern)
  52                 if not templates:
  53                     logger.log("WARNING: omf_resctl plugin, no template found for slice %s using pattern %s"\
  54                                    %(name,pattern))
  55                     continue
  56                 for template in templates:
  57                     # remove the .in extension
  58                     yaml=template[:-3]
  59                     # figure service name as subdir under etc/
  60                     service_name=os.path.split(template.replace(etc_path,''))[0]
  61                     # read template and replace
  62                     template_contents=file(template).read()
  63                     yaml_contents=template_contents\
  64                         .replace('@XMPP_SERVER@',xmpp_server)\
  65                         .replace('@NODE_HRN@',node_hrn)\
  66                         .replace('@SLICE_NAME@',name)
  67                     changes=tools.replace_file_with_string(yaml,yaml_contents)
  68                     if changes:
  69                         sp=subprocess.Popen(['vserver',name,'exec','service',service_name,'restart'],
  70                                             stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
  71                         (output,retcod)=sp.communicate()
  72                         logger.log("omf_resctl: %s: restarted resource controller (retcod=%r)"%(name,retcod))
  73                         logger.log("omf_resctl: got output\n%s"%output)
  74                     else:
  75                         logger.log("omf_resctl: %s: omf_control'ed sliver has no change" % name)