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_rspec_smgr(self, xrn = None):
  92         hrn, type = urn_to_hrn(xrn)
  93         # convert and threshold to ints
  94         if self.has_key('timestamp') and self['timestamp']:
  95             hr_timestamp = self['timestamp']
  96             timestamp = datetime.datetime.fromtimestamp(time.mktime(time.strptime(hr_timestamp, self.api.time_format)))
  97             hr_threshold = self['threshold']
  98             threshold = datetime.datetime.fromtimestamp(time.mktime(time.strptime(hr_threshold, self.api.time_format)))
  99         else:
 100             timestamp = datetime.datetime.now()
 101             hr_timestamp = timestamp.strftime(self.api.time_format)
 102             delta = datetime.timedelta(hours=self.ttl)
 103             threshold = timestamp + delta
 104             hr_threshold = threshold.strftime(self.api.time_format)
 105
 106         start_time = int(timestamp.strftime("%s"))
 107         end_time = int(threshold.strftime("%s"))
 108         duration = end_time - start_time
 109
 110         aggregates = Aggregates(self.api)
 111         rspecs = {}
 112         networks = []
 113         rspec = RSpec()
 114         credential = self.api.getCredential()
 115         origin_hrn = self.origin_hrn
 116         for aggregate in aggregates:
 117           if aggregate not in [self.api.auth.client_cred.get_gid_caller().get_hrn()]:
 118             try:
 119                 # get the rspec from the aggregate
 120                 agg_rspec = aggregates[aggregate].get_resources(credential, xrn, origin_hrn)
 121                 # extract the netspec from each aggregates rspec
 122                 rspec.parseString(agg_rspec)
 123                 networks.extend([{'NetSpec': rspec.getDictsByTagName('NetSpec')}])
 124             except:
 125                 # XX print out to some error log
 126                 print >> log, "Error getting resources at aggregate %s" % aggregate
 127                 traceback.print_exc(log)
 128                 print >> log, "%s" % (traceback.format_exc())
 129         # create the rspec dict
 130         resources = {'networks': networks, 'start_time': start_time, 'duration': duration}
 131         resourceDict = {'RSpec': resources}
 132         # convert rspec dict to xml
 133         rspec.parseDict(resourceDict)
 134         return rspec.toxml()
 135
 136     def refresh_nodes_smgr(self):
 137
 138         rspec = self.get_remote_resources()
 139         # filter according to policy
 140         blist = self.policy['node_blacklist']
 141         wlist = self.policy['node_whitelist']
 142         rspec.filter('NodeSpec', 'name', blacklist=blist, whitelist=wlist)
 143
 144         # update timestamp and threshold
 145         timestamp = datetime.datetime.now()
 146         hr_timestamp = timestamp.strftime(self.api.time_format)
 147         delta = datetime.timedelta(hours=self.ttl)
 148         threshold = timestamp + delta
 149         hr_threshold = threshold.strftime(self.api.time_format)
 150
 151         nodedict = {'rspec': rspec.toxml(),
 152                     'timestamp': hr_timestamp,
 153                     'threshold':  hr_threshold}
 154
 155         self.update(nodedict)
 156         self.write()
 157
 158     def get_rspec(self, xrn = None):
 159
 160         if self.api.interface in ['slicemgr']:
 161             return self.get_rspec_smgr(xrn)
 162         elif self.api.interface in ['aggregate']:
 163             return self.get_rspec_aggregate(xrn)
 164
 165     def get_rspec_aggregate(self, xrn = None):
 166         """
 167         Get resource information from PLC
 168         """
 169         hrn, type = urn_to_hrn(xrn)
 170         slicename = None
 171         # Get the required nodes
 172         if not hrn:
 173             nodes = self.api.plshell.GetNodes(self.api.plauth, {'peer_id': None})
 174             try:  linkspecs = self.api.plshell.GetLinkSpecs() # if call is supported
 175             except:  linkspecs = []
 176         else:
 177             slicename = hrn_to_pl_slicename(hrn)
 178             slices = self.api.plshell.GetSlices(self.api.plauth, [slicename])
 179             if not slices:
 180                 nodes = []
 181             else:
 182                 slice = slices[0]
 183                 node_ids = slice['node_ids']
 184                 nodes = self.api.plshell.GetNodes(self.api.plauth, {'peer_id': None, 'node_id': node_ids})
 185
 186         # Filter out whitelisted nodes
 187         public_nodes = lambda n: n.has_key('slice_ids_whitelist') and not n['slice_ids_whitelist']
 188
 189         # ...only if they are not already assigned to this slice.
 190         if (not slicename):
 191             nodes = filter(public_nodes, nodes)
 192
 193         # Get all network interfaces
 194         interface_ids = []
 195         for node in nodes:
 196             # The field name has changed in plcapi 4.3
 197             if self.api.plshell_version in ['4.2']:
 198                 interface_ids.extend(node['nodenetwork_ids'])
 199             elif self.api.plshell_version in ['4.3']:
 200                 interface_ids.extend(node['interface_ids'])
 201             else:
 202                 raise SfaAPIError, "Unsupported plcapi version ", \
 203                                  self.api.plshell_version
 204
 205         if self.api.plshell_version in ['4.2']:
 206             interfaces = self.api.plshell.GetNodeNetworks(self.api.plauth, interface_ids)
 207         elif self.api.plshell_version in ['4.3']:
 208             interfaces = self.api.plshell.GetInterfaces(self.api.plauth, interface_ids)
 209         else:
 210             raise SfaAPIError, "Unsupported plcapi version ", \
 211                                 self.api.plshell_version
 212         interface_dict = {}
 213         for interface in interfaces:
 214             if self.api.plshell_version in ['4.2']:
 215                 interface_dict[interface['nodenetwork_id']] = interface
 216             elif self.api.plshell_version in ['4.3']:
 217                 interface_dict[interface['interface_id']] = interface
 218             else:
 219                 raise SfaAPIError, "Unsupported plcapi version", \
 220                                     self.api.plshell_version
 221
 222         # join nodes with thier interfaces
 223         for node in nodes:
 224             node['interfaces'] = []
 225             if self.api.plshell_version in ['4.2']:
 226                 for nodenetwork_id in node['nodenetwork_ids']:
 227                     node['interfaces'].append(interface_dict[nodenetwork_id])
 228             elif self.api.plshell_version in ['4.3']:
 229                 for interface_id in node['interface_ids']:
 230                     node['interfaces'].append(interface_dict[interface_id])
 231             else:
 232                 raise SfaAPIError, "Unsupported plcapi version", \
 233                                     self.api.plshell_version
 234
 235         # convert and threshold to ints
 236         if self.has_key('timestamp') and self['timestamp']:
 237             timestamp = datetime.datetime.fromtimestamp(time.mktime(time.strptime(self['timestamp'], self.api.time_format)))
 238             threshold = datetime.datetime.fromtimestamp(time.mktime(time.strptime(self['threshold'], self.api.time_format)))
 239         else:
 240             timestamp = datetime.datetime.now()
 241             delta = datetime.timedelta(hours=self.ttl)
 242             threshold = timestamp + delta
 243
 244         start_time = int(timestamp.strftime("%s"))
 245         end_time = int(threshold.strftime("%s"))
 246         duration = end_time - start_time
 247
 248         # create the plc dict
 249         networks = [{'nodes': nodes,
 250                      'name': self.api.hrn,
 251                      'start_time': start_time,
 252                      'duration': duration}]
 253         if not hrn:
 254             networks[0]['links'] = linkspecs
 255         resources = {'networks': networks, 'start_time': start_time, 'duration': duration}
 256
 257         # convert the plc dict to an rspec dict
 258         resourceDict = RSpecDict(resources)
 259         # convert the rspec dict to xml
 260         rspec = RSpec()
 261         rspec.parseDict(resourceDict)
 262         return rspec.toxml()
 263