sfa/plc/slices.py

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