sfa/plc/nodes.py

   1 ### $Id$
   2 ### $URL$
   3
   4 import os
   5 import time
   6 import datetime
   7 import sys
   8 import traceback
   9
  10 from sfa.util.namespace import *
  11 from sfa.util.rspec import *
  12 from sfa.util.specdict import *
  13 from sfa.util.faults import *
  14 from sfa.util.storage import *
  15 from sfa.util.debug import log
  16 from sfa.util.rspec import *
  17 from sfa.util.specdict import *
  18 from sfa.util.policy import Policy
  19 from sfa.server.aggregate import Aggregates
  20
  21 class Nodes(SimpleStorage):
  22
  23     def __init__(self, api, ttl = 1, origin_hrn=None):
  24         self.api = api
  25         self.ttl = ttl
  26         self.threshold = None
  27         path = self.api.config.SFA_DATA_DIR
  28         filename = ".".join([self.api.interface, self.api.hrn, "nodes"])
  29         filepath = path + os.sep + filename
  30         self.nodes_file = filepath
  31         SimpleStorage.__init__(self, self.nodes_file)
  32         self.policy = Policy(api)
  33         self.load()
  34         self.origin_hrn = origin_hrn
  35
  36
  37     def refresh(self):
  38         """
  39         Update the cached list of nodes
  40         """
  41
  42         # Reload components list
  43         now = datetime.datetime.now()
  44         if not self.has_key('threshold') or not self.has_key('timestamp') or \
  45            now > datetime.datetime.fromtimestamp(time.mktime(time.strptime(self['threshold'], self.api.time_format))):
  46             if self.api.interface in ['aggregate']:
  47                 self.refresh_nodes_aggregate()
  48             elif self.api.interface in ['slicemgr']:
  49                 self.refresh_nodes_smgr()
  50
  51     def refresh_nodes_aggregate(self):
  52         rspec = RSpec()
  53         rspec.parseString(self.get_rspec())
  54
  55         # filter nodes according to policy
  56         blist = self.policy['node_blacklist']
  57         wlist = self.policy['node_whitelist']
  58         rspec.filter('NodeSpec', 'name', blacklist=blist, whitelist=wlist)
  59
  60         # extract ifspecs from rspec to get ips'
  61         ips = []
  62         ifspecs = rspec.getDictsByTagName('IfSpec')
  63         for ifspec in ifspecs:
  64             if ifspec.has_key('addr') and ifspec['addr']:
  65                 ips.append(ifspec['addr'])
  66
  67         # extract nodespecs from rspec to get dns names
  68         hostnames = []
  69         nodespecs = rspec.getDictsByTagName('NodeSpec')
  70         for nodespec in nodespecs:
  71             if nodespec.has_key('name') and nodespec['name']:
  72                 hostnames.append(nodespec['name'])
  73
  74         # update timestamp and threshold
  75         timestamp = datetime.datetime.now()
  76         hr_timestamp = timestamp.strftime(self.api.time_format)
  77         delta = datetime.timedelta(hours=self.ttl)
  78         threshold = timestamp + delta
  79         hr_threshold = threshold.strftime(self.api.time_format)
  80
  81         node_details = {}
  82         node_details['rspec'] = rspec.toxml()
  83         node_details['ip'] = ips
  84         node_details['dns'] = hostnames
  85         node_details['timestamp'] = hr_timestamp
  86         node_details['threshold'] = hr_threshold
  87         # save state
  88         self.update(node_details)
  89         self.write()
  90
  91     def get_remote_resources(self, hrn = None):
  92         # convert and threshold to ints
  93         if self.has_key('timestamp') and self['timestamp']:
  94             hr_timestamp = self['timestamp']
  95             timestamp = datetime.datetime.fromtimestamp(time.mktime(time.strptime(hr_timestamp, self.api.time_format)))
  96             hr_threshold = self['threshold']
  97             threshold = datetime.datetime.fromtimestamp(time.mktime(time.strptime(hr_threshold, self.api.time_format)))
  98         else:
  99             timestamp = datetime.datetime.now()
 100             hr_timestamp = timestamp.strftime(self.api.time_format)
 101             delta = datetime.timedelta(hours=self.ttl)
 102             threshold = timestamp + delta
 103             hr_threshold = threshold.strftime(self.api.time_format)
 104
 105         start_time = int(timestamp.strftime("%s"))
 106         end_time = int(threshold.strftime("%s"))
 107         duration = end_time - start_time
 108
 109         aggregates = Aggregates(self.api)
 110         rspecs = {}
 111         networks = []
 112         rspec = RSpec()
 113         credential = self.api.getCredential()
 114         origin_hrn = self.origin_hrn
 115         for aggregate in aggregates:
 116           if aggregate not in [self.api.auth.client_cred.get_gid_caller().get_hrn()]:
 117             try:
 118                 # get the rspec from the aggregate
 119                 agg_rspec = aggregates[aggregate].get_resources(credential, hrn, origin_hrn)
 120                 # extract the netspec from each aggregates rspec
 121                 rspec.parseString(agg_rspec)
 122                 networks.extend([{'NetSpec': rspec.getDictsByTagName('NetSpec')}])
 123             except:
 124                 # XX print out to some error log
 125                 print >> log, "Error getting resources at aggregate %s" % aggregate
 126                 traceback.print_exc(log)
 127                 print >> log, "%s" % (traceback.format_exc())
 128         # create the rspec dict
 129         resources = {'networks': networks, 'start_time': start_time, 'duration': duration}
 130         resourceDict = {'RSpec': resources}
 131         # convert rspec dict to xml
 132         rspec.parseDict(resourceDict)
 133         return rspec
 134
 135     def refresh_nodes_smgr(self):
 136
 137         rspec = self.get_remote_resources()
 138         # filter according to policy
 139         blist = self.policy['node_blacklist']
 140         wlist = self.policy['node_whitelist']
 141         rspec.filter('NodeSpec', 'name', blacklist=blist, whitelist=wlist)
 142
 143         # update timestamp and threshold
 144         timestamp = datetime.datetime.now()
 145         hr_timestamp = timestamp.strftime(self.api.time_format)
 146         delta = datetime.timedelta(hours=self.ttl)
 147         threshold = timestamp + delta
 148         hr_threshold = threshold.strftime(self.api.time_format)
 149
 150         nodedict = {'rspec': rspec.toxml(),
 151                     'timestamp': hr_timestamp,
 152                     'threshold':  hr_threshold}
 153
 154         self.update(nodedict)
 155         self.write()
 156
 157     def get_rspec(self, hrn = None):
 158
 159         if self.api.interface in ['slicemgr']:
 160             return self.get_rspec_smgr(hrn)
 161         elif self.api.interface in ['aggregate']:
 162             return self.get_rspec_aggregate(hrn)
 163
 164     def get_rspec_smgr(self, hrn = None):
 165
 166         rspec = self.get_remote_resources(hrn)
 167         return rspec.toxml()
 168
 169     def get_rspec_aggregate(self, hrn = None):
 170         """
 171         Get resource information from PLC
 172         """
 173
 174         slicename = None
 175         # Get the required nodes
 176         if not hrn:
 177             nodes = self.api.plshell.GetNodes(self.api.plauth, {'peer_id': None})
 178             try:  linkspecs = self.api.plshell.GetLinkSpecs() # if call is supported
 179             except:  linkspecs = []
 180         else:
 181             slicename = hrn_to_pl_slicename(hrn)
 182             slices = self.api.plshell.GetSlices(self.api.plauth, [slicename])
 183             if not slices:
 184                 nodes = []
 185             else:
 186                 slice = slices[0]
 187                 node_ids = slice['node_ids']
 188                 nodes = self.api.plshell.GetNodes(self.api.plauth, {'peer_id': None, 'node_id': node_ids})
 189
 190         # Filter out whitelisted nodes
 191         public_nodes = lambda n: n.has_key('slice_ids_whitelist') and not n['slice_ids_whitelist']
 192
 193         # ...only if they are not already assigned to this slice.
 194         if (not slicename):
 195             nodes = filter(public_nodes, nodes)
 196
 197         # Get all network interfaces
 198         interface_ids = []
 199         for node in nodes:
 200             # The field name has changed in plcapi 4.3
 201             if self.api.plshell_version in ['4.2']:
 202                 interface_ids.extend(node['nodenetwork_ids'])
 203             elif self.api.plshell_version in ['4.3']:
 204                 interface_ids.extend(node['interface_ids'])
 205             else:
 206                 raise SfaAPIError, "Unsupported plcapi version ", \
 207                                  self.api.plshell_version
 208
 209         if self.api.plshell_version in ['4.2']:
 210             interfaces = self.api.plshell.GetNodeNetworks(self.api.plauth, interface_ids)
 211         elif self.api.plshell_version in ['4.3']:
 212             interfaces = self.api.plshell.GetInterfaces(self.api.plauth, interface_ids)
 213         else:
 214             raise SfaAPIError, "Unsupported plcapi version ", \
 215                                 self.api.plshell_version
 216         interface_dict = {}
 217         for interface in interfaces:
 218             if self.api.plshell_version in ['4.2']:
 219                 interface_dict[interface['nodenetwork_id']] = interface
 220             elif self.api.plshell_version in ['4.3']:
 221                 interface_dict[interface['interface_id']] = interface
 222             else:
 223                 raise SfaAPIError, "Unsupported plcapi version", \
 224                                     self.api.plshell_version
 225
 226         # join nodes with thier interfaces
 227         for node in nodes:
 228             node['interfaces'] = []
 229             if self.api.plshell_version in ['4.2']:
 230                 for nodenetwork_id in node['nodenetwork_ids']:
 231                     node['interfaces'].append(interface_dict[nodenetwork_id])
 232             elif self.api.plshell_version in ['4.3']:
 233                 for interface_id in node['interface_ids']:
 234                     node['interfaces'].append(interface_dict[interface_id])
 235             else:
 236                 raise SfaAPIError, "Unsupported plcapi version", \
 237                                     self.api.plshell_version
 238
 239         # convert and threshold to ints
 240         if self.has_key('timestamp') and self['timestamp']:
 241             timestamp = datetime.datetime.fromtimestamp(time.mktime(time.strptime(self['timestamp'], self.api.time_format)))
 242             threshold = datetime.datetime.fromtimestamp(time.mktime(time.strptime(self['threshold'], self.api.time_format)))
 243         else:
 244             timestamp = datetime.datetime.now()
 245             delta = datetime.timedelta(hours=self.ttl)
 246             threshold = timestamp + delta
 247
 248         start_time = int(timestamp.strftime("%s"))
 249         end_time = int(threshold.strftime("%s"))
 250         duration = end_time - start_time
 251
 252         # create the plc dict
 253         networks = [{'nodes': nodes,
 254                      'name': self.api.hrn,
 255                      'start_time': start_time,
 256                      'duration': duration}]
 257         if not hrn:
 258             networks[0]['links'] = linkspecs
 259         resources = {'networks': networks, 'start_time': start_time, 'duration': duration}
 260
 261         # convert the plc dict to an rspec dict
 262         resourceDict = RSpecDict(resources)
 263         # convert the rspec dict to xml
 264         rspec = RSpec()
 265         rspec.parseDict(resourceDict)
 266         return rspec.toxml()
 267