sfa/plc/slices.py

   1 from types import StringTypes
   2 from collections import defaultdict
   3
   4 from sfa.util.xrn import get_leaf, get_authority, urn_to_hrn
   5 from sfa.util.plxrn import hrn_to_pl_slicename
   6 from sfa.util.policy import Policy
   7 from sfa.rspecs.rspec import RSpec
   8 from sfa.plc.vlink import VLink
   9 from sfa.util.xrn import Xrn
  10
  11 MAXINT =  2L**31-1
  12
  13 class Slices:
  14
  15     rspec_to_slice_tag = {'max_rate':'net_max_rate'}
  16
  17     def __init__(self, api, ttl = .5, origin_hrn=None):
  18         self.api = api
  19         #filepath = path + os.sep + filename
  20         self.policy = Policy(self.api)
  21         self.origin_hrn = origin_hrn
  22         self.registry = api.registries[api.hrn]
  23         self.credential = api.getCredential()
  24         self.nodes = []
  25         self.persons = []
  26
  27     def get_slivers(self, xrn, node=None):
  28         hrn, type = urn_to_hrn(xrn)
  29
  30         slice_name = hrn_to_pl_slicename(hrn)
  31         # XX Should we just call PLCAPI.GetSliceTicket(slice_name) instead
  32         # of doing all of this?
  33         #return self.api.driver.GetSliceTicket(self.auth, slice_name)
  34
  35         # from PLCAPI.GetSlivers.get_slivers()
  36         slice_fields = ['slice_id', 'name', 'instantiation', 'expires', 'person_ids', 'slice_tag_ids']
  37         slices = self.api.driver.GetSlices(slice_name, slice_fields)
  38         # Build up list of users and slice attributes
  39         person_ids = set()
  40         all_slice_tag_ids = set()
  41         for slice in slices:
  42             person_ids.update(slice['person_ids'])
  43             all_slice_tag_ids.update(slice['slice_tag_ids'])
  44         person_ids = list(person_ids)
  45         all_slice_tag_ids = list(all_slice_tag_ids)
  46         # Get user information
  47         all_persons_list = self.api.driver.GetPersons({'person_id':person_ids,'enabled':True}, ['person_id', 'enabled', 'key_ids'])
  48         all_persons = {}
  49         for person in all_persons_list:
  50             all_persons[person['person_id']] = person
  51
  52         # Build up list of keys
  53         key_ids = set()
  54         for person in all_persons.values():
  55             key_ids.update(person['key_ids'])
  56         key_ids = list(key_ids)
  57         # Get user account keys
  58         all_keys_list = self.api.driver.GetKeys(key_ids, ['key_id', 'key', 'key_type'])
  59         all_keys = {}
  60         for key in all_keys_list:
  61             all_keys[key['key_id']] = key
  62         # Get slice attributes
  63         all_slice_tags_list = self.api.driver.GetSliceTags(all_slice_tag_ids)
  64         all_slice_tags = {}
  65         for slice_tag in all_slice_tags_list:
  66             all_slice_tags[slice_tag['slice_tag_id']] = slice_tag
  67
  68         slivers = []
  69         for slice in slices:
  70             keys = []
  71             for person_id in slice['person_ids']:
  72                 if person_id in all_persons:
  73                     person = all_persons[person_id]
  74                     if not person['enabled']:
  75                         continue
  76                     for key_id in person['key_ids']:
  77                         if key_id in all_keys:
  78                             key = all_keys[key_id]
  79                             keys += [{'key_type': key['key_type'],
  80                                     'key': key['key']}]
  81             attributes = []
  82             # All (per-node and global) attributes for this slice
  83             slice_tags = []
  84             for slice_tag_id in slice['slice_tag_ids']:
  85                 if slice_tag_id in all_slice_tags:
  86                     slice_tags.append(all_slice_tags[slice_tag_id])
  87             # Per-node sliver attributes take precedence over global
  88             # slice attributes, so set them first.
  89             # Then comes nodegroup slice attributes
  90             # Followed by global slice attributes
  91             sliver_attributes = []
  92
  93             if node is not None:
  94                 for sliver_attribute in filter(lambda a: a['node_id'] == node['node_id'], slice_tags):
  95                     sliver_attributes.append(sliver_attribute['tagname'])
  96                     attributes.append({'tagname': sliver_attribute['tagname'],
  97                                     'value': sliver_attribute['value']})
  98
  99             # set nodegroup slice attributes
 100             for slice_tag in filter(lambda a: a['nodegroup_id'] in node['nodegroup_ids'], slice_tags):
 101                 # Do not set any nodegroup slice attributes for
 102                 # which there is at least one sliver attribute
 103                 # already set.
 104                 if slice_tag not in slice_tags:
 105                     attributes.append({'tagname': slice_tag['tagname'],
 106                         'value': slice_tag['value']})
 107
 108             for slice_tag in filter(lambda a: a['node_id'] is None, slice_tags):
 109                 # Do not set any global slice attributes for
 110                 # which there is at least one sliver attribute
 111                 # already set.
 112                 if slice_tag['tagname'] not in sliver_attributes:
 113                     attributes.append({'tagname': slice_tag['tagname'],
 114                                    'value': slice_tag['value']})
 115
 116             # XXX Sanity check; though technically this should be a system invariant
 117             # checked with an assertion
 118             if slice['expires'] > MAXINT:  slice['expires']= MAXINT
 119
 120             slivers.append({
 121                 'hrn': hrn,
 122                 'name': slice['name'],
 123                 'slice_id': slice['slice_id'],
 124                 'instantiation': slice['instantiation'],
 125                 'expires': slice['expires'],
 126                 'keys': keys,
 127                 'attributes': attributes
 128             })
 129
 130         return slivers
 131
 132     def get_peer(self, xrn):
 133         hrn, type = urn_to_hrn(xrn)
 134         # Becaues of myplc federation,  we first need to determine if this
 135         # slice belongs to out local plc or a myplc peer. We will assume it
 136         # is a local site, unless we find out otherwise
 137         peer = None
 138
 139         # get this slice's authority (site)
 140         slice_authority = get_authority(hrn)
 141
 142         # get this site's authority (sfa root authority or sub authority)
 143         site_authority = get_authority(slice_authority).lower()
 144
 145         # check if we are already peered with this site_authority, if so
 146         peers = self.api.driver.GetPeers({}, ['peer_id', 'peername', 'shortname', 'hrn_root'])
 147         for peer_record in peers:
 148             names = [name.lower() for name in peer_record.values() if isinstance(name, StringTypes)]
 149             if site_authority in names:
 150                 peer = peer_record
 151
 152         return peer
 153
 154     def get_sfa_peer(self, xrn):
 155         hrn, type = urn_to_hrn(xrn)
 156
 157         # return the authority for this hrn or None if we are the authority
 158         sfa_peer = None
 159         slice_authority = get_authority(hrn)
 160         site_authority = get_authority(slice_authority)
 161
 162         if site_authority != self.api.hrn:
 163             sfa_peer = site_authority
 164
 165         return sfa_peer
 166
 167     def verify_slice_nodes(self, slice, requested_slivers, peer):
 168
 169         nodes = self.api.driver.GetNodes(slice['node_ids'], ['hostname'])
 170         current_slivers = [node['hostname'] for node in nodes]
 171
 172         # remove nodes not in rspec
 173         deleted_nodes = list(set(current_slivers).difference(requested_slivers))
 174
 175         # add nodes from rspec
 176         added_nodes = list(set(requested_slivers).difference(current_slivers))
 177
 178         try:
 179             if peer:
 180                 self.api.driver.UnBindObjectFromPeer('slice', slice['slice_id'], peer['shortname'])
 181             self.api.driver.AddSliceToNodes(slice['name'], added_nodes)
 182             self.api.driver.DeleteSliceFromNodes(slice['name'], deleted_nodes)
 183
 184         except:
 185             self.api.logger.log_exc('Failed to add/remove slice from nodes')
 186
 187     def verify_slice_links(self, slice, links, aggregate):
 188         # nodes is undefined here
 189         if not links:
 190             return
 191
 192         for link in links:
 193             # get the ip address of the first node in the link
 194             ifname1 = Xrn(link['interface1']['component_id']).get_leaf()
 195             (node, device) = ifname1.split(':')
 196             node_id = int(node.replace('node', ''))
 197             node = aggregate.nodes[node_id]
 198             if1 = aggregate.interfaces[node['interface_ids'][0]]
 199             ipaddr = if1['ip']
 200             topo_rspec = VLink.get_topo_rspec(link, ipaddr)
 201             self.api.driver.AddSliceTag(slice['name'], 'topo_rspec', str([topo_rspec]), node_id)
 202
 203
 204
 205     def handle_peer(self, site, slice, persons, peer):
 206         if peer:
 207             # bind site
 208             try:
 209                 if site:
 210                     self.api.driver.BindObjectToPeer('site', site['site_id'], peer['shortname'], slice['site_id'])
 211             except Exception,e:
 212                 self.api.driver.DeleteSite(site['site_id'])
 213                 raise e
 214
 215             # bind slice
 216             try:
 217                 if slice:
 218                     self.api.driver.BindObjectToPeer('slice', slice['slice_id'], peer['shortname'], slice['slice_id'])
 219             except Exception,e:
 220                 self.api.driver.DeleteSlice(slice['slice_id'])
 221                 raise e
 222
 223             # bind persons
 224             for person in persons:
 225                 try:
 226                     self.api.driver.BindObjectToPeer('person',
 227                                                      person['person_id'], peer['shortname'], person['peer_person_id'])
 228
 229                     for (key, remote_key_id) in zip(person['keys'], person['key_ids']):
 230                         try:
 231                             self.api.driver.BindObjectToPeer( 'key', key['key_id'], peer['shortname'], remote_key_id)
 232                         except:
 233                             self.api.driver.DeleteKey(key['key_id'])
 234                             self.api.logger("failed to bind key: %s to peer: %s " % (key['key_id'], peer['shortname']))
 235                 except Exception,e:
 236                     self.api.driver.DeletePerson(person['person_id'])
 237                     raise e
 238
 239         return slice
 240
 241     def verify_site(self, slice_xrn, slice_record={}, peer=None, sfa_peer=None):
 242         (slice_hrn, type) = urn_to_hrn(slice_xrn)
 243         site_hrn = get_authority(slice_hrn)
 244         # login base can't be longer than 20 characters
 245         slicename = hrn_to_pl_slicename(slice_hrn)
 246         authority_name = slicename.split('_')[0]
 247         login_base = authority_name[:20]
 248         sites = self.api.driver.GetSites(login_base)
 249         if not sites:
 250             # create new site record
 251             site = {'name': 'geni.%s' % authority_name,
 252                     'abbreviated_name': authority_name,
 253                     'login_base': login_base,
 254                     'max_slices': 100,
 255                     'max_slivers': 1000,
 256                     'enabled': True,
 257                     'peer_site_id': None}
 258             if peer:
 259                 site['peer_site_id'] = slice_record.get('site_id', None)
 260             site['site_id'] = self.api.driver.AddSite(site)
 261             # exempt federated sites from monitor policies
 262             self.api.driver.AddSiteTag(site['site_id'], 'exempt_site_until', "20200101")
 263
 264             # is this still necessary?
 265             # add record to the local registry
 266             if sfa_peer and slice_record:
 267                 peer_dict = {'type': 'authority', 'hrn': site_hrn, \
 268                              'peer_authority': sfa_peer, 'pointer': site['site_id']}
 269                 self.registry.register_peer_object(self.credential, peer_dict)
 270         else:
 271             site =  sites[0]
 272             if peer:
 273                 # unbind from peer so we can modify if necessary. Will bind back later
 274                 self.api.driver.UnBindObjectFromPeer('site', site['site_id'], peer['shortname'])
 275
 276         return site
 277
 278     def verify_slice(self, slice_hrn, slice_record, peer, sfa_peer):
 279         slicename = hrn_to_pl_slicename(slice_hrn)
 280         parts = slicename.split("_")
 281         login_base = parts[0]
 282         slices = self.api.driver.GetSlices([slicename])
 283         if not slices:
 284             slice = {'name': slicename,
 285                      'url': slice_record.get('url', slice_hrn),
 286                      'description': slice_record.get('description', slice_hrn)}
 287             # add the slice
 288             slice['slice_id'] = self.api.driver.AddSlice(slice)
 289             slice['node_ids'] = []
 290             slice['person_ids'] = []
 291             if peer:
 292                 slice['peer_slice_id'] = slice_record.get('slice_id', None)
 293             # mark this slice as an sfa peer record
 294             if sfa_peer:
 295                 peer_dict = {'type': 'slice', 'hrn': slice_hrn,
 296                              'peer_authority': sfa_peer, 'pointer': slice['slice_id']}
 297                 self.registry.register_peer_object(self.credential, peer_dict)
 298         else:
 299             slice = slices[0]
 300             if peer:
 301                 slice['peer_slice_id'] = slice_record.get('slice_id', None)
 302                 # unbind from peer so we can modify if necessary. Will bind back later
 303                 self.api.driver.UnBindObjectFromPeer('slice', slice['slice_id'], peer['shortname'])
 304                 #Update existing record (e.g. expires field) it with the latest info.
 305             if slice_record and slice['expires'] != slice_record['expires']:
 306                 self.api.driver.UpdateSlice( slice['slice_id'], {'expires' : slice_record['expires']})
 307
 308         return slice
 309
 310     #def get_existing_persons(self, users):
 311     def verify_persons(self, slice_hrn, slice_record, users, peer, sfa_peer, append=True):
 312         users_by_email = {}
 313         users_by_site = defaultdict(list)
 314
 315         users_dict = {}
 316         for user in users:
 317             if 'append' in user and user['append'] == False:
 318                 append = False
 319             if 'email' in user:
 320                 users_by_email[user['email']] = user
 321                 users_dict[user['email']] = user
 322             elif 'urn' in user:
 323                 hrn, type = urn_to_hrn(user['urn'])
 324                 username = get_leaf(hrn)
 325                 login_base = get_leaf(get_authority(user['urn']))
 326                 user['username'] = username
 327                 users_by_site[login_base].append(user)
 328
 329         existing_user_ids = []
 330         if users_by_email:
 331             # get existing users by email
 332             existing_users = self.api.driver.GetPersons({'email': users_by_email.keys()},
 333                                                         ['person_id', 'key_ids', 'email'])
 334             existing_user_ids.extend([user['email'] for user in existing_users])
 335
 336         if users_by_site:
 337             # get a list of user sites (based on requeste user urns
 338             site_list = self.api.driver.GetSites(users_by_site.keys(), \
 339                 ['site_id', 'login_base', 'person_ids'])
 340             sites = {}
 341             site_user_ids = []
 342
 343             # get all existing users at these sites
 344             for site in site_list:
 345                 sites[site['site_id']] = site
 346                 site_user_ids.extend(site['person_ids'])
 347
 348             existing_site_persons_list = self.api.driver.GetPersons(site_user_ids,
 349                                                                     ['person_id', 'key_ids', 'email', 'site_ids'])
 350
 351             # all requested users are either existing users or new (added) users
 352             for login_base in users_by_site:
 353                 requested_site_users = users_by_site[login_base]
 354                 for requested_user in requested_site_users:
 355                     user_found = False
 356                     for existing_user in existing_site_persons_list:
 357                         for site_id in existing_user['site_ids']:
 358                             site = sites[site_id]
 359                             if login_base == site['login_base'] and \
 360                                existing_user['email'].startswith(requested_user['username']):
 361                                 existing_user_ids.append(existing_user['email'])
 362                                 users_dict[existing_user['email']] = requested_user
 363                                 user_found = True
 364                                 break
 365                         if user_found:
 366                             break
 367
 368                     if user_found == False:
 369                         fake_email = requested_user['username'] + '@geni.net'
 370                         users_dict[fake_email] = requested_user
 371
 372
 373         # requested slice users
 374         requested_user_ids = users_dict.keys()
 375         # existing slice users
 376         existing_slice_users_filter = {'person_id': slice_record.get('person_ids', [])}
 377         existing_slice_users = self.api.driver.GetPersons(existing_slice_users_filter,
 378                                                           ['person_id', 'key_ids', 'email'])
 379         existing_slice_user_ids = [user['email'] for user in existing_slice_users]
 380
 381         # users to be added, removed or updated
 382         added_user_ids = set(requested_user_ids).difference(existing_user_ids)
 383         added_slice_user_ids = set(requested_user_ids).difference(existing_slice_user_ids)
 384         removed_user_ids = set(existing_slice_user_ids).difference(requested_user_ids)
 385         updated_user_ids = set(existing_slice_user_ids).intersection(requested_user_ids)
 386
 387         # Remove stale users (only if we are not appending).
 388         if append == False:
 389             for removed_user_id in removed_user_ids:
 390                 self.api.driver.DeletePersonFromSlice(removed_user_id, slice_record['name'])
 391         # update_existing users
 392         updated_users_list = [user for user in existing_slice_users if user['email'] in \
 393           updated_user_ids]
 394         self.verify_keys(existing_slice_users, updated_users_list, peer, append)
 395
 396         added_persons = []
 397         # add new users
 398         for added_user_id in added_user_ids:
 399             added_user = users_dict[added_user_id]
 400             hrn, type = urn_to_hrn(added_user['urn'])
 401             person = {
 402                 'first_name': added_user.get('first_name', hrn),
 403                 'last_name': added_user.get('last_name', hrn),
 404                 'email': added_user_id,
 405                 'peer_person_id': None,
 406                 'keys': [],
 407                 'key_ids': added_user.get('key_ids', []),
 408             }
 409             person['person_id'] = self.api.driver.AddPerson(person)
 410             if peer:
 411                 person['peer_person_id'] = added_user['person_id']
 412             added_persons.append(person)
 413
 414             # enable the account
 415             self.api.driver.UpdatePerson(person['person_id'], {'enabled': True})
 416
 417             # add person to site
 418             self.api.driver.AddPersonToSite(added_user_id, login_base)
 419
 420             for key_string in added_user.get('keys', []):
 421                 key = {'key':key_string, 'key_type':'ssh'}
 422                 key['key_id'] = self.api.driver.AddPersonKey(person['person_id'], key)
 423                 person['keys'].append(key)
 424
 425             # add the registry record
 426             if sfa_peer:
 427                 peer_dict = {'type': 'user', 'hrn': hrn, 'peer_authority': sfa_peer, \
 428                     'pointer': person['person_id']}
 429                 self.registry.register_peer_object(self.credential, peer_dict)
 430
 431         for added_slice_user_id in added_slice_user_ids.union(added_user_ids):
 432             # add person to the slice
 433             self.api.driver.AddPersonToSlice(added_slice_user_id, slice_record['name'])
 434             # if this is a peer record then it should already be bound to a peer.
 435             # no need to return worry about it getting bound later
 436
 437         return added_persons
 438
 439
 440     def verify_keys(self, persons, users, peer, append=True):
 441         # existing keys
 442         key_ids = []
 443         for person in persons:
 444             key_ids.extend(person['key_ids'])
 445         keylist = self.api.driver.GetKeys(key_ids, ['key_id', 'key'])
 446         keydict = {}
 447         for key in keylist:
 448             keydict[key['key']] = key['key_id']
 449         existing_keys = keydict.keys()
 450         persondict = {}
 451         for person in persons:
 452             persondict[person['email']] = person
 453
 454         # add new keys
 455         requested_keys = []
 456         updated_persons = []
 457         for user in users:
 458             user_keys = user.get('keys', [])
 459             updated_persons.append(user)
 460             for key_string in user_keys:
 461                 requested_keys.append(key_string)
 462                 if key_string not in existing_keys:
 463                     key = {'key': key_string, 'key_type': 'ssh'}
 464                     try:
 465                         if peer:
 466                             person = persondict[user['email']]
 467                             self.api.driver.UnBindObjectFromPeer('person', person['person_id'], peer['shortname'])
 468                         key['key_id'] = self.api.driver.AddPersonKey(user['email'], key)
 469                         if peer:
 470                             key_index = user_keys.index(key['key'])
 471                             remote_key_id = user['key_ids'][key_index]
 472                             self.api.driver.BindObjectToPeer('key', key['key_id'], peer['shortname'], remote_key_id)
 473
 474                     finally:
 475                         if peer:
 476                             self.api.driver.BindObjectToPeer('person', person['person_id'], peer['shortname'], user['person_id'])
 477
 478         # remove old keys (only if we are not appending)
 479         if append == False:
 480             removed_keys = set(existing_keys).difference(requested_keys)
 481             for existing_key_id in keydict:
 482                 if keydict[existing_key_id] in removed_keys:
 483                     try:
 484                         if peer:
 485                             self.api.driver.UnBindObjectFromPeer('key', existing_key_id, peer['shortname'])
 486                         self.api.driver.DeleteKey(existing_key_id)
 487                     except:
 488                         pass
 489
 490     def verify_slice_attributes(self, slice, requested_slice_attributes):
 491         # get list of attributes users ar able to manage
 492         slice_attributes = self.api.driver.GetTagTypes({'category': '*slice*', '|roles': ['user']})
 493         valid_slice_attribute_names = [attribute['tagname'] for attribute in slice_attributes]
 494
 495         # get sliver attributes
 496         added_slice_attributes = []
 497         removed_slice_attributes = []
 498         ignored_slice_attribute_names = []
 499         existing_slice_attributes = self.api.driver.GetSliceTags({'slice_id': slice['slice_id']})
 500
 501         # get attributes that should be removed
 502         for slice_tag in existing_slice_attributes:
 503             if slice_tag['tagname'] in ignored_slice_attribute_names:
 504                 # If a slice already has a admin only role it was probably given to them by an
 505                 # admin, so we should ignore it.
 506                 ignored_slice_attribute_names.append(slice_tag['tagname'])
 507             else:
 508                 # If an existing slice attribute was not found in the request it should
 509                 # be removed
 510                 attribute_found=False
 511                 for requested_attribute in requested_slice_attributes:
 512                     if requested_attribute['name'] == slice_tag['tagname'] and \
 513                        requested_attribute['value'] == slice_tag['value']:
 514                         attribute_found=True
 515                         break
 516
 517             if not attribute_found:
 518                 removed_slice_attributes.append(slice_tag)
 519
 520         # get attributes that should be added:
 521         for requested_attribute in requested_slice_attributes:
 522             # if the requested attribute wasn't found  we should add it
 523             if requested_attribute['name'] in valid_slice_attribute_names:
 524                 attribute_found = False
 525                 for existing_attribute in existing_slice_attributes:
 526                     if requested_attribute['name'] == existing_attribute['tagname'] and \
 527                        requested_attribute['value'] == existing_attribute['value']:
 528                         attribute_found=True
 529                         break
 530                 if not attribute_found:
 531                     added_slice_attributes.append(requested_attribute)
 532
 533
 534         # remove stale attributes
 535         for attribute in removed_slice_attributes:
 536             try:
 537                 self.api.driver.DeleteSliceTag(attribute['slice_tag_id'])
 538             except Exception, e:
 539                 self.api.logger.warn('Failed to remove sliver attribute. name: %s, value: %s, node_id: %s\nCause:%s'\
 540                                 % (name, value,  node_id, str(e)))
 541
 542         # add requested_attributes
 543         for attribute in added_slice_attributes:
 544             try:
 545                 self.api.driver.AddSliceTag(slice['name'], attribute['name'], attribute['value'], attribute.get('node_id', None))
 546             except Exception, e:
 547                 self.api.logger.warn('Failed to add sliver attribute. name: %s, value: %s, node_id: %s\nCause:%s'\
 548                                 % (name, value,  node_id, str(e)))
 549
 550     def create_slice_aggregate(self, xrn, rspec):
 551         hrn, type = urn_to_hrn(xrn)
 552         # Determine if this is a peer slice
 553         peer = self.get_peer(hrn)
 554         sfa_peer = self.get_sfa_peer(hrn)
 555
 556         spec = RSpec(rspec)
 557         # Get the slice record from sfa
 558         slicename = hrn_to_pl_slicename(hrn)
 559         slice = {}
 560         slice_record = None
 561         registry = self.api.registries[self.api.hrn]
 562         credential = self.api.getCredential()
 563
 564         site_id, remote_site_id = self.verify_site(registry, credential, hrn, peer, sfa_peer)
 565         slice = self.verify_slice(registry, credential, hrn, site_id, remote_site_id, peer, sfa_peer)
 566
 567         # find out where this slice is currently running
 568         nodelist = self.api.driver.GetNodes(slice['node_ids'], ['hostname'])
 569         hostnames = [node['hostname'] for node in nodelist]
 570
 571         # get netspec details
 572         nodespecs = spec.getDictsByTagName('NodeSpec')
 573
 574         # dict in which to store slice attributes to set for the nodes
 575         nodes = {}
 576         for nodespec in nodespecs:
 577             if isinstance(nodespec['name'], list):
 578                 for nodename in nodespec['name']:
 579                     nodes[nodename] = {}
 580                     for k in nodespec.keys():
 581                         rspec_attribute_value = nodespec[k]
 582                         if (self.rspec_to_slice_tag.has_key(k)):
 583                             slice_tag_name = self.rspec_to_slice_tag[k]
 584                             nodes[nodename][slice_tag_name] = rspec_attribute_value
 585             elif isinstance(nodespec['name'], StringTypes):
 586                 nodename = nodespec['name']
 587                 nodes[nodename] = {}
 588                 for k in nodespec.keys():
 589                     rspec_attribute_value = nodespec[k]
 590                     if (self.rspec_to_slice_tag.has_key(k)):
 591                         slice_tag_name = self.rspec_to_slice_tag[k]
 592                         nodes[nodename][slice_tag_name] = rspec_attribute_value
 593
 594                 for k in nodespec.keys():
 595                     rspec_attribute_value = nodespec[k]
 596                     if (self.rspec_to_slice_tag.has_key(k)):
 597                         slice_tag_name = self.rspec_to_slice_tag[k]
 598                         nodes[nodename][slice_tag_name] = rspec_attribute_value
 599
 600         node_names = nodes.keys()
 601         # remove nodes not in rspec
 602         deleted_nodes = list(set(hostnames).difference(node_names))
 603         # add nodes from rspec
 604         added_nodes = list(set(node_names).difference(hostnames))
 605
 606         try:
 607             if peer:
 608                 self.api.driver.UnBindObjectFromPeer('slice', slice['slice_id'], peer)
 609
 610             self.api.driver.AddSliceToNodes(slicename, added_nodes)
 611
 612             # Add recognized slice tags
 613             for node_name in node_names:
 614                 node = nodes[node_name]
 615                 for slice_tag in node.keys():
 616                     value = node[slice_tag]
 617                     if (isinstance(value, list)):
 618                         value = value[0]
 619
 620                     self.api.driver.AddSliceTag(slicename, slice_tag, value, node_name)
 621
 622             self.api.driver.DeleteSliceFromNodes(slicename, deleted_nodes)
 623         finally:
 624             if peer:
 625                 self.api.driver.BindObjectToPeer('slice', slice['slice_id'], peer, slice['peer_slice_id'])
 626
 627         return 1
 628