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_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.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                 # get the rspec from the aggregate
 118                 try:
 119                     agg_rspec = aggregates[aggregate].get_resources(credential, hrn, caller_cred)
 120                 except:
 121                     arg_list = [credential, hrn]
 122                     request_hash = self.api.key.compute_hash(arg_list)
 123                     agg_rspec = aggregates[aggregate].get_resources(credential, hrn, request_hash, caller_cred)
 124                 # extract the netspec from each aggregates rspec
 125                 rspec.parseString(agg_rspec)
 126                 networks.extend([{'NetSpec': rspec.getDictsByTagName('NetSpec')}])
 127             except:
 128                 # XX print out to some error log
 129                 print >> log, "Error getting resources at aggregate %s" % aggregate
 130                 traceback.print_exc(log)
 131                 print >> log, "%s" % (traceback.format_exc())
 132         # create the rspec dict
 133         resources = {'networks': networks, 'start_time': start_time, 'duration': duration}
 134         resourceDict = {'RSpec': resources}
 135         # convert rspec dict to xml
 136         rspec.parseDict(resourceDict)
 137         return rspec
 138
 139     def refresh_nodes_smgr(self):
 140
 141         rspec = self.get_remote_resources()
 142         # filter according to policy
 143         blist = self.policy['node_blacklist']
 144         wlist = self.policy['node_whitelist']
 145         rspec.filter('NodeSpec', 'name', blacklist=blist, whitelist=wlist)
 146
 147         # update timestamp and threshold
 148         timestamp = datetime.datetime.now()
 149         hr_timestamp = timestamp.strftime(self.api.time_format)
 150         delta = datetime.timedelta(hours=self.ttl)
 151         threshold = timestamp + delta
 152         hr_threshold = threshold.strftime(self.api.time_format)
 153
 154         nodedict = {'rspec': rspec.toxml(),
 155                     'timestamp': hr_timestamp,
 156                     'threshold':  hr_threshold}
 157
 158         self.update(nodedict)
 159         self.write()
 160
 161     def get_rspec(self, hrn = None):
 162
 163         if self.api.interface in ['slicemgr']:
 164             return self.get_rspec_smgr(hrn)
 165         elif self.api.interface in ['aggregate']:
 166             return self.get_rspec_aggregate(hrn)
 167
 168     def get_rspec_smgr(self, hrn = None):
 169
 170         rspec = self.get_remote_resources(hrn)
 171         return rspec.toxml()
 172
 173     def get_rspec_aggregate(self, hrn = None):
 174         """
 175         Get resource information from PLC
 176         """
 177
 178         slicename = None
 179         # Get the required nodes
 180         if not hrn:
 181             nodes = self.api.plshell.GetNodes(self.api.plauth, {'peer_id': None})
 182             try:  linkspecs = self.api.plshell.GetLinkSpecs() # if call is supported
 183             except:  linkspecs = []
 184         else:
 185             slicename = hrn_to_pl_slicename(hrn)
 186             slices = self.api.plshell.GetSlices(self.api.plauth, [slicename])
 187             if not slices:
 188                 nodes = []
 189             else:
 190                 slice = slices[0]
 191                 node_ids = slice['node_ids']
 192                 nodes = self.api.plshell.GetNodes(self.api.plauth, {'peer_id': None, 'node_id': node_ids})
 193
 194         # Filter out whitelisted nodes
 195         public_nodes = lambda n: n.has_key('slice_ids_whitelist') and not n['slice_ids_whitelist']
 196
 197         # ...only if they are not already assigned to this slice.
 198         if (not slicename):
 199             nodes = filter(public_nodes, nodes)
 200
 201         # Get all network interfaces
 202         interface_ids = []
 203         for node in nodes:
 204             # The field name has changed in plcapi 4.3
 205             if self.api.plshell_version in ['4.2']:
 206                 interface_ids.extend(node['nodenetwork_ids'])
 207             elif self.api.plshell_version in ['4.3']:
 208                 interface_ids.extend(node['interface_ids'])
 209             else:
 210                 raise GeniAPIError, "Unsupported plcapi version ", \
 211                                  self.api.plshell_version
 212
 213         if self.api.plshell_version in ['4.2']:
 214             interfaces = self.api.plshell.GetNodeNetworks(self.api.plauth, interface_ids)
 215         elif self.api.plshell_version in ['4.3']:
 216             interfaces = self.api.plshell.GetInterfaces(self.api.plauth, interface_ids)
 217         else:
 218             raise GeniAPIError, "Unsupported plcapi version ", \
 219                                 self.api.plshell_version
 220         interface_dict = {}
 221         for interface in interfaces:
 222             if self.api.plshell_version in ['4.2']:
 223                 interface_dict[interface['nodenetwork_id']] = interface
 224             elif self.api.plshell_version in ['4.3']:
 225                 interface_dict[interface['interface_id']] = interface
 226             else:
 227                 raise GeniAPIError, "Unsupported plcapi version", \
 228                                     self.api.plshell_version
 229
 230         # join nodes with thier interfaces
 231         for node in nodes:
 232             node['interfaces'] = []
 233             if self.api.plshell_version in ['4.2']:
 234                 for nodenetwork_id in node['nodenetwork_ids']:
 235                     node['interfaces'].append(interface_dict[nodenetwork_id])
 236             elif self.api.plshell_version in ['4.3']:
 237                 for interface_id in node['interface_ids']:
 238                     node['interfaces'].append(interface_dict[interface_id])
 239             else:
 240                 raise GeniAPIError, "Unsupported plcapi version", \
 241                                     self.api.plshell_version
 242
 243         # convert and threshold to ints
 244         if self.has_key('timestamp') and self['timestamp']:
 245             timestamp = datetime.datetime.fromtimestamp(time.mktime(time.strptime(self['timestamp'], self.api.time_format)))
 246             threshold = datetime.datetime.fromtimestamp(time.mktime(time.strptime(self['threshold'], self.api.time_format)))
 247         else:
 248             timestamp = datetime.datetime.now()
 249             delta = datetime.timedelta(hours=self.ttl)
 250             threshold = timestamp + delta
 251
 252         start_time = int(timestamp.strftime("%s"))
 253         end_time = int(threshold.strftime("%s"))
 254         duration = end_time - start_time
 255
 256         # create the plc dict
 257         networks = [{'nodes': nodes,
 258                      'name': self.api.hrn,
 259                      'start_time': start_time,
 260                      'duration': duration}]
 261         if not hrn:
 262             networks[0]['links'] = linkspecs
 263         resources = {'networks': networks, 'start_time': start_time, 'duration': duration}
 264
 265         # convert the plc dict to an rspec dict
 266         resourceDict = RSpecDict(resources)
 267         # convert the rspec dict to xml
 268         rspec = RSpec()
 269         rspec.parseDict(resourceDict)
 270         return rspec.toxml()
 271