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.misc 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, caller_cred=None):
  24         self.api = api
  25         self.ttl = ttl
  26         self.threshold = None
  27         path = self.api.config.SFA_BASE_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.caller_cred=caller_cred
  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         for aggregate in aggregates:
 115             try:
 116                 caller_cred = self.caller_cred
 117                 cred_str = credential.save_to_string(save_parents=True)
 118                 arg_list = [cred_str, hrn]
 119                 request_hash = self.api.key.compute_hash(arg_list)
 120
 121                 # get the rspec from the aggregate
 122                 agg_rspec = aggregates[aggregate].get_resources(cred_str, hrn, request_hash, caller_cred)
 123                 # extract the netspec from each aggregates rspec
 124                 rspec.parseString(agg_rspec)
 125                 networks.extend([{'NetSpec': rspec.getDictsByTagName('NetSpec')}])
 126             except:
 127                 # XX print out to some error log
 128                 print >> log, "Error getting resources at aggregate %s" % aggregate
 129                 traceback.print_exc(log)
 130                 print >> log, "%s" % (traceback.format_exc())
 131         # create the rspec dict
 132         resources = {'networks': networks, 'start_time': start_time, 'duration': duration}
 133         resourceDict = {'Rspec': resources}
 134         # convert rspec dict to xml
 135         rspec.parseDict(resourceDict)
 136         return rspec
 137
 138     def refresh_nodes_smgr(self):
 139
 140         rspec = self.get_remote_resources()
 141         # filter according to policy
 142         blist = self.policy['node_blacklist']
 143         wlist = self.policy['node_whitelist']
 144         rspec.filter('NodeSpec', 'name', blacklist=blist, whitelist=wlist)
 145
 146         # update timestamp and threshold
 147         timestamp = datetime.datetime.now()
 148         hr_timestamp = timestamp.strftime(self.api.time_format)
 149         delta = datetime.timedelta(hours=self.ttl)
 150         threshold = timestamp + delta
 151         hr_threshold = threshold.strftime(self.api.time_format)
 152
 153         nodedict = {'rspec': rspec.toxml(),
 154                     'timestamp': hr_timestamp,
 155                     'threshold':  hr_threshold}
 156
 157         self.update(nodedict)
 158         self.write()
 159
 160     def get_rspec(self, hrn = None):
 161
 162         if self.api.interface in ['slicemgr']:
 163             return self.get_rspec_smgr(hrn)
 164         elif self.api.interface in ['aggregate']:
 165             return self.get_rspec_aggregate(hrn)
 166
 167     def get_rspec_smgr(self, hrn = None):
 168
 169         rspec = self.get_remote_resources(hrn)
 170         return rspec.toxml()
 171
 172     def get_rspec_aggregate(self, hrn = None):
 173         """
 174         Get resource information from PLC
 175         """
 176
 177         # Get the required nodes
 178         if not hrn:
 179             nodes = self.api.plshell.GetNodes(self.api.plauth, {'peer_id': None})
 180             try:  linkspecs = self.api.plshell.GetLinkSpecs() # if call is supported
 181             except:  linkspecs = []
 182         else:
 183             slicename = hrn_to_pl_slicename(hrn)
 184             slices = self.api.plshell.GetSlices(self.api.plauth, [slicename])
 185             if not slices:
 186                 nodes = []
 187             else:
 188                 slice = slices[0]
 189                 node_ids = slice['node_ids']
 190                 nodes = self.api.plshell.GetNodes(self.api.plauth, {'peer_id': None, 'node_id': node_ids})
 191
 192         # Filter out whitelisted nodes
 193         public_nodes = lambda n: n.has_key('slice_ids_whitelist') and not n['slice_ids_whitelist']
 194         nodes = filter(public_nodes, nodes)
 195
 196         # Get all network interfaces
 197         interface_ids = []
 198         for node in nodes:
 199             # The field name has changed in plcapi 4.3
 200             if self.api.plshell_version in ['4.2']:
 201                 interface_ids.extend(node['nodenetwork_ids'])
 202             elif self.api.plshell_version in ['4.3']:
 203                 interface_ids.extend(node['interface_ids'])
 204             else:
 205                 raise GeniAPIError, "Unsupported plcapi version ", \
 206                                  self.api.plshell_version
 207
 208         if self.api.plshell_version in ['4.2']:
 209             interfaces = self.api.plshell.GetNodeNetworks(self.api.plauth, interface_ids)
 210         elif self.api.plshell_version in ['4.3']:
 211             interfaces = self.api.plshell.GetInterfaces(self.api.plauth, interface_ids)
 212         else:
 213             raise GeniAPIError, "Unsupported plcapi version ", \
 214                                 self.api.plshell_version
 215         interface_dict = {}
 216         for interface in interfaces:
 217             if self.api.plshell_version in ['4.2']:
 218                 interface_dict[interface['nodenetwork_id']] = interface
 219             elif self.api.plshell_version in ['4.3']:
 220                 interface_dict[interface['interface_id']] = interface
 221             else:
 222                 raise GeniAPIError, "Unsupported plcapi version", \
 223                                     self.api.plshell_version
 224
 225         # join nodes with thier interfaces
 226         for node in nodes:
 227             node['interfaces'] = []
 228             if self.api.plshell_version in ['4.2']:
 229                 for nodenetwork_id in node['nodenetwork_ids']:
 230                     node['interfaces'].append(interface_dict[nodenetwork_id])
 231             elif self.api.plshell_version in ['4.3']:
 232                 for interface_id in node['interface_ids']:
 233                     node['interfaces'].append(interface_dict[interface_id])
 234             else:
 235                 raise GeniAPIError, "Unsupported plcapi version", \
 236                                     self.api.plshell_version
 237
 238         # convert and threshold to ints
 239         if self.has_key('timestamp') and self['timestamp']:
 240             timestamp = datetime.datetime.fromtimestamp(time.mktime(time.strptime(self['timestamp'], self.api.time_format)))
 241             threshold = datetime.datetime.fromtimestamp(time.mktime(time.strptime(self['threshold'], self.api.time_format)))
 242         else:
 243             timestamp = datetime.datetime.now()
 244             delta = datetime.timedelta(hours=self.ttl)
 245             threshold = timestamp + delta
 246
 247         start_time = int(timestamp.strftime("%s"))
 248         end_time = int(threshold.strftime("%s"))
 249         duration = end_time - start_time
 250
 251         # create the plc dict
 252         networks = [{'nodes': nodes,
 253                      'name': self.api.hrn,
 254                      'start_time': start_time,
 255                      'duration': duration}]
 256         if not hrn:
 257             networks[0]['links'] = linkspecs
 258         resources = {'networks': networks, 'start_time': start_time, 'duration': duration}
 259
 260         # convert the plc dict to an rspec dict
 261         resourceDict = RspecDict(resources)
 262         # convert the rspec dict to xml
 263         rspec = Rspec()
 264         rspec.parseDict(resourceDict)
 265         return rspec.toxml()
 266