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