sfa/senslab/slabslices.py

   1 from types import StringTypes
   2 from collections import defaultdict
   3 import sys
   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 from sfa.util.sfalogging import logger
  11
  12 MAXINT =  2L**31-1
  13
  14 class SlabSlices:
  15
  16     rspec_to_slice_tag = {'max_rate':'net_max_rate'}
  17
  18     #def __init__(self, api, ttl = .5, origin_hrn=None):
  19         #self.api = api
  20         ##filepath = path + os.sep + filename
  21         #self.policy = Policy(self.api)
  22         #self.origin_hrn = origin_hrn
  23         #self.registry = api.registries[api.hrn]
  24         #self.credential = api.getCredential()
  25         #self.nodes = []
  26         #self.persons = []
  27
  28
  29     def __init__(self, driver):
  30         self.driver = driver
  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.driver.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.driver.GetSlices(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.driver.GetPersons({'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.driver.GetKeys(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.driver.GetSliceTags(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         #Does this slice belong to a local site or a peer senslab site?
 139         peer = None
 140
 141         # get this slice's authority (site)
 142         slice_authority = get_authority(hrn)
 143
 144         # get this site's authority (sfa root authority or sub authority)
 145         site_authority = get_authority(slice_authority).lower()
 146         print>>sys.stderr, " \r\n \r\n \t slices.py get_peer slice_authority  %s site_authority %s " %(slice_authority, site_authority)
 147         # check if we are already peered with this site_authority, if so
 148         peers = self.driver.GetPeers({})
 149         print>>sys.stderr, " \r\n \r\n \t slices.py get_peer peers %s " %(peers)
 150         for peer_record in peers:
 151
 152             if site_authority == peer_record.hrn:
 153                 peer = peer_record
 154         print>>sys.stderr, " \r\n \r\n \t slices.py get_peer peer  %s " %(peer)
 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.driver.hrn:
 166             sfa_peer = site_authority
 167
 168         return sfa_peer
 169
 170     def verify_slice_nodes(self, slice, requested_slivers, peer):
 171         current_slivers = []
 172         deleted_nodes = []
 173         if slice['node_ids']:
 174             nodes = self.driver.GetNodes(slice['node_ids'], ['hostname'])
 175             current_slivers = [node['hostname'] for node in nodes]
 176
 177             # remove nodes not in rspec
 178             deleted_nodes = list(set(current_slivers).difference(requested_slivers))
 179
 180         # add nodes from rspec
 181         added_nodes = list(set(requested_slivers).difference(current_slivers))
 182         print>>sys.stderr , "\r\n \r\n \t slices.py  verify_slice_nodes added_nodes %s slice %s" %( added_nodes,slice)
 183         try:
 184             #if peer:
 185                 #self.driver.UnBindObjectFromPeer('slice', slice['slice_id'], peer['shortname'])
 186             #PI is a list, get the only username in this list
 187             #so that the OAR/LDAP knows the user: remove the authority from the name
 188             tmp=  slice['PI'][0].split(".")
 189             username = tmp[(len(tmp)-1)]
 190             self.driver.AddSliceToNodes(slice['name'], added_nodes, username)
 191
 192             if deleted_nodes:
 193                 self.driver.DeleteSliceFromNodes(slice['name'], deleted_nodes)
 194
 195         except:
 196             logger.log_exc('Failed to add/remove slice from nodes')
 197
 198     def free_egre_key(self):
 199         used = set()
 200         for tag in self.driver.GetSliceTags({'tagname': 'egre_key'}):
 201                 used.add(int(tag['value']))
 202
 203         for i in range(1, 256):
 204             if i not in used:
 205                 key = i
 206                 break
 207         else:
 208             raise KeyError("No more EGRE keys available")
 209
 210         return str(key)
 211
 212
 213
 214
 215
 216
 217     def handle_peer(self, site, slice, persons, peer):
 218         if peer:
 219             # bind site
 220             try:
 221                 if site:
 222                     self.driver.BindObjectToPeer('site', site['site_id'], peer['shortname'], slice['site_id'])
 223             except Exception,e:
 224                 self.driver.DeleteSite(site['site_id'])
 225                 raise e
 226
 227             # bind slice
 228             try:
 229                 if slice:
 230                     self.driver.BindObjectToPeer('slice', slice['slice_id'], peer['shortname'], slice['slice_id'])
 231             except Exception,e:
 232                 self.driver.DeleteSlice(slice['slice_id'])
 233                 raise e
 234
 235             # bind persons
 236             for person in persons:
 237                 try:
 238                     self.driver.BindObjectToPeer('person',
 239                                                      person['person_id'], peer['shortname'], person['peer_person_id'])
 240
 241                     for (key, remote_key_id) in zip(person['keys'], person['key_ids']):
 242                         try:
 243                             self.driver.BindObjectToPeer( 'key', key['key_id'], peer['shortname'], remote_key_id)
 244                         except:
 245                             self.driver.DeleteKey(key['key_id'])
 246                             logger("failed to bind key: %s to peer: %s " % (key['key_id'], peer['shortname']))
 247                 except Exception,e:
 248                     self.driver.DeletePerson(person['person_id'])
 249                     raise e
 250
 251         return slice
 252
 253     #def verify_site(self, slice_xrn, slice_record={}, peer=None, sfa_peer=None, options={}):
 254         #(slice_hrn, type) = urn_to_hrn(slice_xrn)
 255         #site_hrn = get_authority(slice_hrn)
 256         ## login base can't be longer than 20 characters
 257         ##slicename = hrn_to_pl_slicename(slice_hrn)
 258         #authority_name = slice_hrn.split('.')[0]
 259         #login_base = authority_name[:20]
 260         #print >>sys.stderr, " \r\n \r\n \t\t SLABSLICES.PY verify_site authority_name %s  login_base %s slice_hrn %s" %(authority_name,login_base,slice_hrn)
 261
 262         #sites = self.driver.GetSites(login_base)
 263         #if not sites:
 264             ## create new site record
 265             #site = {'name': 'geni.%s' % authority_name,
 266                     #'abbreviated_name': authority_name,
 267                     #'login_base': login_base,
 268                     #'max_slices': 100,
 269                     #'max_slivers': 1000,
 270                     #'enabled': True,
 271                     #'peer_site_id': None}
 272             #if peer:
 273                 #site['peer_site_id'] = slice_record.get('site_id', None)
 274             #site['site_id'] = self.driver.AddSite(site)
 275             ## exempt federated sites from monitor policies
 276             #self.driver.AddSiteTag(site['site_id'], 'exempt_site_until', "20200101")
 277
 278             ### is this still necessary?
 279             ### add record to the local registry
 280             ##if sfa_peer and slice_record:
 281                 ##peer_dict = {'type': 'authority', 'hrn': site_hrn, \
 282                              ##'peer_authority': sfa_peer, 'pointer': site['site_id']}
 283                 ##self.registry.register_peer_object(self.credential, peer_dict)
 284         #else:
 285             #site =  sites[0]
 286             #if peer:
 287                 ## unbind from peer so we can modify if necessary. Will bind back later
 288                 #self.driver.UnBindObjectFromPeer('site', site['site_id'], peer['shortname'])
 289
 290         #return site
 291
 292     def verify_slice(self, slice_hrn, slice_record, peer, sfa_peer, options={} ):
 293         #slicename = hrn_to_pl_slicename(slice_hrn)
 294         #parts = hrn_to_pl_slicename(slice_hrn).split("_")
 295         login_base = slice_hrn.split(".")[0]
 296         slicename = slice_hrn
 297         sl = self.driver.GetSlices(slice_filter=slicename, filter_type = 'slice_hrn')
 298         if sl:
 299         #slices = self.driver.GetSlices(slice_filter={'slice_hrn': slicename})
 300         #slices = self.driver.GetSlices([slicename])
 301             print>>sys.stderr, " \r\n \r\rn Slices.py verify_slice slicename %s sl %s slice_record %s"%(slicename ,sl, slice_record)
 302         else:
 303             print>>sys.stderr, " \r\n \r\rn Slices.py verify_slice UH-Oh..."
 304         if not sl:
 305             slice = {'name': slicename,
 306                      'url': slice_record.get('url', slice_hrn),
 307                      #'description': slice_record.get('description', slice_hrn)
 308                      }
 309             # add the slice
 310             slice['slice_id'] = self.driver.AddSlice(slice)
 311             slice['node_ids'] = []
 312             slice['person_ids'] = []
 313             #if peer:
 314                 #slice['peer_slice_id'] = slice_record.get('slice_id', None)
 315             # mark this slice as an sfa peer record
 316             #if sfa_peer:
 317                 #peer_dict = {'type': 'slice', 'hrn': slice_hrn,
 318                              #'peer_authority': sfa_peer, 'pointer': slice['slice_id']}
 319                 #self.registry.register_peer_object(self.credential, peer_dict)
 320         else:
 321             slice = sl
 322             slice.update(slice_record)
 323             #del slice['last_updated']
 324             #del slice['date_created']
 325             #if peer:
 326                 #slice['peer_slice_id'] = slice_record.get('slice_id', None)
 327                 ## unbind from peer so we can modify if necessary. Will bind back later
 328                 #self.driver.UnBindObjectFromPeer('slice', slice['slice_id'], peer['shortname'])
 329                 #Update existing record (e.g. expires field) it with the latest info.
 330             ##if slice_record and slice['expires'] != slice_record['expires']:
 331                 ##self.driver.UpdateSlice( slice['slice_id'], {'expires' : slice_record['expires']})
 332
 333         return slice
 334
 335     #def get_existing_persons(self, users):
 336     def verify_persons(self, slice_hrn, slice_record, users,  peer, sfa_peer, options={}):
 337         users_by_id = {}
 338         users_by_hrn = {}
 339         users_dict = {}
 340
 341         for user in users:
 342             if 'person_id' in user and 'hrn' in user:
 343                 users_by_id[user['person_id']] = user
 344                 users_dict[user['person_id']] = {'person_id':user['person_id'], 'hrn':user['hrn']}
 345
 346                 users_by_hrn[user['hrn']] = user
 347                 users_dict[user['hrn']] = {'person_id':user['person_id'], 'hrn':user['hrn']}
 348
 349         #print>>sys.stderr, " \r\n \r\n \t slabslices.py verify_person  users_dict %s \r\n user_by_hrn %s \r\n \tusers_by_id %s " %( users_dict,users_by_hrn, users_by_id)
 350
 351         existing_user_ids = []
 352         existing_user_hrns = []
 353         existing_users= []
 354         #Check if user is in LDAP using its hrn.
 355         #Assuming Senslab is centralised :  one LDAP for all sites, user_id unknown from LDAP
 356         # LDAP does not provide users id, therfore we rely on hrns
 357         if users_by_hrn:
 358             existing_users = self.driver.GetPersons({'hrn': users_by_hrn.keys()},
 359                                                         ['hrn','pkey'])
 360             if existing_users:
 361                 for user in existing_users :
 362                     #for  k in users_dict[user['hrn']] :
 363                     existing_user_hrns.append (users_dict[user['hrn']]['hrn'])
 364                     existing_user_ids.append (users_dict[user['hrn']]['person_id'])
 365                     #print>>sys.stderr, " \r\n \r\n \t slabslices.py verify_person  existing_user_ids.append (users_dict[user['hrn']][k]) %s \r\n existing_users %s " %(  existing_user_ids,existing_users)
 366
 367
 368         # requested slice users
 369         requested_user_ids = users_by_id.keys()
 370         requested_user_hrns = users_by_hrn.keys()
 371         #print>>sys.stderr, " \r\n \r\n \t slabslices.py verify_person  requested_user_ids  %s user_by_hrn %s " %( requested_user_ids,users_by_hrn)
 372         # existing slice users
 373         existing_slice_users_filter = {'hrn': slice_record.get('PI', [])}
 374         #print>>sys.stderr, " \r\n \r\n slices.py verify_person requested_user_ids %s existing_slice_users_filter %s slice_record %s" %(requested_user_ids,existing_slice_users_filter,slice_record)
 375
 376         existing_slice_users = self.driver.GetPersons(existing_slice_users_filter,['hrn','pkey'])
 377         #print>>sys.stderr, " \r\n \r\n slices.py verify_person   existing_slice_users %s " %(existing_slice_users)
 378
 379         existing_slice_user_hrns = [user['hrn'] for user in existing_slice_users]
 380
 381         #print>>sys.stderr, " \r\n \r\n slices.py verify_person requested_user_ids %s  existing_slice_user_hrns %s " %(requested_user_ids,existing_slice_user_hrns)
 382         # users to be added, removed or updated
 383
 384         added_user_hrns = set(requested_user_hrns).difference(set(existing_user_hrns))
 385
 386         added_slice_user_hrns = set(requested_user_hrns).difference(existing_slice_user_hrns)
 387
 388         removed_user_hrns = set(existing_slice_user_hrns).difference(requested_user_hrns)
 389
 390
 391         updated_user_hrns = set(existing_slice_user_hrns).intersection(requested_user_hrns)
 392         #print>>sys.stderr, " \r\n \r\n slices.py verify_persons  added_user_ids %s added_slice_user_ids %s " %(added_user_ids,added_slice_user_ids)
 393         #print>>sys.stderr, " \r\n \r\n slices.py verify_persons  removed_user_hrns %s updated_user_hrns %s " %(removed_user_hrns,updated_user_hrns)
 394         # Remove stale users (only if we are not appending)
 395         append = options.get('append', True)
 396         if append == False:
 397             for removed_user_hrn in removed_user_hrns:
 398                 self.driver.DeletePersonFromSlice(removed_user_hrn, slice_record['name'])
 399         # update_existing users
 400         updated_users_list = [user for user in existing_slice_users if user['hrn'] in \
 401           updated_user_hrns]
 402         print>>sys.stderr, " \r\n \r\n slices.py verify_persons  removed_user_hrns %s updated_users_list %s " %(removed_user_hrns,updated_users_list)
 403         #self.verify_keys(existing_slice_users, updated_users_list, peer, append)
 404
 405         added_persons = []
 406         # add new users
 407         for added_user_hrn in added_user_hrns:
 408             added_user = users_dict[added_user_hrn]
 409             #hrn, type = urn_to_hrn(added_user['urn'])
 410             person = {
 411                 #'first_name': added_user.get('first_name', hrn),
 412                 #'last_name': added_user.get('last_name', hrn),
 413                 'person_id': added_user['person_id'],
 414                 #'peer_person_id': None,
 415                 #'keys': [],
 416                 #'key_ids': added_user.get('key_ids', []),
 417
 418             }
 419             #print>>sys.stderr, " \r\n \r\n slices.py verify_persons   added_user_ids %s " %(added_user_ids)
 420             person['person_id'] = self.driver.AddPerson(person)
 421             if peer:
 422                 person['peer_person_id'] = added_user['person_id']
 423             added_persons.append(person)
 424
 425             # enable the account
 426             self.driver.UpdatePerson(person['person_id'], {'enabled': True})
 427
 428             # add person to site
 429             #self.driver.AddPersonToSite(added_user_id, login_base)
 430
 431             #for key_string in added_user.get('keys', []):
 432                 #key = {'key':key_string, 'key_type':'ssh'}
 433                 #key['key_id'] = self.driver.AddPersonKey(person['person_id'], key)
 434                 #person['keys'].append(key)
 435
 436             # add the registry record
 437             #if sfa_peer:
 438                 #peer_dict = {'type': 'user', 'hrn': hrn, 'peer_authority': sfa_peer, \
 439                     #'pointer': person['person_id']}
 440                 #self.registry.register_peer_object(self.credential, peer_dict)
 441         for added_slice_user_hrn in added_slice_user_hrns.union(added_user_hrns):
 442             self.driver.AddPersonToSlice(added_slice_user_hrn, slice_record['name'])
 443         #for added_slice_user_id in added_slice_user_ids.union(added_user_ids):
 444             # add person to the slice
 445             #self.driver.AddPersonToSlice(added_slice_user_id, slice_record['name'])
 446             # if this is a peer record then it should already be bound to a peer.
 447             # no need to return worry about it getting bound later
 448
 449         return added_persons
 450
 451
 452     def verify_keys(self, persons, users, peer, options={}):
 453         # existing keys
 454         key_ids = []
 455         for person in persons:
 456             key_ids.extend(person['key_ids'])
 457         keylist = self.driver.GetKeys(key_ids, ['key_id', 'key'])
 458         keydict = {}
 459         for key in keylist:
 460             keydict[key['key']] = key['key_id']
 461         existing_keys = keydict.keys()
 462         persondict = {}
 463         for person in persons:
 464             persondict[person['email']] = person
 465
 466         # add new keys
 467         requested_keys = []
 468         updated_persons = []
 469         for user in users:
 470             user_keys = user.get('keys', [])
 471             updated_persons.append(user)
 472             for key_string in user_keys:
 473                 requested_keys.append(key_string)
 474                 if key_string not in existing_keys:
 475                     key = {'key': key_string, 'key_type': 'ssh'}
 476                     try:
 477                         if peer:
 478                             person = persondict[user['email']]
 479                             self.driver.UnBindObjectFromPeer('person', person['person_id'], peer['shortname'])
 480                         key['key_id'] = self.driver.AddPersonKey(user['email'], key)
 481                         if peer:
 482                             key_index = user_keys.index(key['key'])
 483                             remote_key_id = user['key_ids'][key_index]
 484                             self.driver.BindObjectToPeer('key', key['key_id'], peer['shortname'], remote_key_id)
 485
 486                     finally:
 487                         if peer:
 488                             self.driver.BindObjectToPeer('person', person['person_id'], peer['shortname'], user['person_id'])
 489
 490         # remove old keys (only if we are not appending)
 491         if append == False:
 492             removed_keys = set(existing_keys).difference(requested_keys)
 493             for existing_key_id in keydict:
 494                 if keydict[existing_key_id] in removed_keys:
 495                     try:
 496                         if peer:
 497                             self.driver.UnBindObjectFromPeer('key', existing_key_id, peer['shortname'])
 498                         self.driver.DeleteKey(existing_key_id)
 499                     except:
 500                         pass
 501
 502     #def verify_slice_attributes(self, slice, requested_slice_attributes, append=False, admin=False):
 503         ## get list of attributes users ar able to manage
 504         #filter = {'category': '*slice*'}
 505         #if not admin:
 506             #filter['|roles'] = ['user']
 507         #slice_attributes = self.driver.GetTagTypes(filter)
 508         #valid_slice_attribute_names = [attribute['tagname'] for attribute in slice_attributes]
 509
 510         ## get sliver attributes
 511         #added_slice_attributes = []
 512         #removed_slice_attributes = []
 513         #ignored_slice_attribute_names = []
 514         #existing_slice_attributes = self.driver.GetSliceTags({'slice_id': slice['slice_id']})
 515
 516         ## get attributes that should be removed
 517         #for slice_tag in existing_slice_attributes:
 518             #if slice_tag['tagname'] in ignored_slice_attribute_names:
 519                 ## If a slice already has a admin only role it was probably given to them by an
 520                 ## admin, so we should ignore it.
 521                 #ignored_slice_attribute_names.append(slice_tag['tagname'])
 522             #else:
 523                 ## If an existing slice attribute was not found in the request it should
 524                 ## be removed
 525                 #attribute_found=False
 526                 #for requested_attribute in requested_slice_attributes:
 527                     #if requested_attribute['name'] == slice_tag['tagname'] and \
 528                        #requested_attribute['value'] == slice_tag['value']:
 529                         #attribute_found=True
 530                         #break
 531
 532             #if not attribute_found and not append:
 533                 #removed_slice_attributes.append(slice_tag)
 534
 535         ## get attributes that should be added:
 536         #for requested_attribute in requested_slice_attributes:
 537             ## if the requested attribute wasn't found  we should add it
 538             #if requested_attribute['name'] in valid_slice_attribute_names:
 539                 #attribute_found = False
 540                 #for existing_attribute in existing_slice_attributes:
 541                     #if requested_attribute['name'] == existing_attribute['tagname'] and \
 542                        #requested_attribute['value'] == existing_attribute['value']:
 543                         #attribute_found=True
 544                         #break
 545                 #if not attribute_found:
 546                     #added_slice_attributes.append(requested_attribute)
 547
 548
 549         ## remove stale attributes
 550         #for attribute in removed_slice_attributes:
 551             #try:
 552                 #self.driver.DeleteSliceTag(attribute['slice_tag_id'])
 553             #except Exception, e:
 554                 #self.logger.warn('Failed to remove sliver attribute. name: %s, value: %s, node_id: %s\nCause:%s'\
 555                                 #% (name, value,  node_id, str(e)))
 556
 557         ## add requested_attributes
 558         #for attribute in added_slice_attributes:
 559             #try:
 560                 #self.driver.AddSliceTag(slice['name'], attribute['name'], attribute['value'], attribute.get('node_id', None))
 561             #except Exception, e:
 562                 #self.logger.warn('Failed to add sliver attribute. name: %s, value: %s, node_id: %s\nCause:%s'\
 563                                 #% (name, value,  node_id, str(e)))
 564
 565     #def create_slice_aggregate(self, xrn, rspec):
 566         #hrn, type = urn_to_hrn(xrn)
 567         ## Determine if this is a peer slice
 568         #peer = self.get_peer(hrn)
 569         #sfa_peer = self.get_sfa_peer(hrn)
 570
 571         #spec = RSpec(rspec)
 572         ## Get the slice record from sfa
 573         #slicename = hrn_to_pl_slicename(hrn)
 574         #slice = {}
 575         #slice_record = None
 576         #registry = self.api.registries[self.api.hrn]
 577         #credential = self.api.getCredential()
 578
 579         #site_id, remote_site_id = self.verify_site(registry, credential, hrn, peer, sfa_peer)
 580         #slice = self.verify_slice(registry, credential, hrn, site_id, remote_site_id, peer, sfa_peer)
 581
 582         ## find out where this slice is currently running
 583         #nodelist = self.driver.GetNodes(slice['node_ids'], ['hostname'])
 584         #hostnames = [node['hostname'] for node in nodelist]
 585
 586         ## get netspec details
 587         #nodespecs = spec.getDictsByTagName('NodeSpec')
 588
 589         ## dict in which to store slice attributes to set for the nodes
 590         #nodes = {}
 591         #for nodespec in nodespecs:
 592             #if isinstance(nodespec['name'], list):
 593                 #for nodename in nodespec['name']:
 594                     #nodes[nodename] = {}
 595                     #for k in nodespec.keys():
 596                         #rspec_attribute_value = nodespec[k]
 597                         #if (self.rspec_to_slice_tag.has_key(k)):
 598                             #slice_tag_name = self.rspec_to_slice_tag[k]
 599                             #nodes[nodename][slice_tag_name] = rspec_attribute_value
 600             #elif isinstance(nodespec['name'], StringTypes):
 601                 #nodename = nodespec['name']
 602                 #nodes[nodename] = {}
 603                 #for k in nodespec.keys():
 604                     #rspec_attribute_value = nodespec[k]
 605                     #if (self.rspec_to_slice_tag.has_key(k)):
 606                         #slice_tag_name = self.rspec_to_slice_tag[k]
 607                         #nodes[nodename][slice_tag_name] = rspec_attribute_value
 608
 609                 #for k in nodespec.keys():
 610                     #rspec_attribute_value = nodespec[k]
 611                     #if (self.rspec_to_slice_tag.has_key(k)):
 612                         #slice_tag_name = self.rspec_to_slice_tag[k]
 613                         #nodes[nodename][slice_tag_name] = rspec_attribute_value
 614
 615         #node_names = nodes.keys()
 616         ## remove nodes not in rspec
 617         #deleted_nodes = list(set(hostnames).difference(node_names))
 618         ## add nodes from rspec
 619         #added_nodes = list(set(node_names).difference(hostnames))
 620
 621         #try:
 622             #if peer:
 623                 #self.driver.UnBindObjectFromPeer('slice', slice['slice_id'], peer)
 624
 625             #self.driver.AddSliceToNodes(slicename, added_nodes)
 626
 627             ## Add recognized slice tags
 628             #for node_name in node_names:
 629                 #node = nodes[node_name]
 630                 #for slice_tag in node.keys():
 631                     #value = node[slice_tag]
 632                     #if (isinstance(value, list)):
 633                         #value = value[0]
 634
 635                     #self.driver.AddSliceTag(slicename, slice_tag, value, node_name)
 636
 637             #self.driver.DeleteSliceFromNodes(slicename, deleted_nodes)
 638         #finally:
 639             #if peer:
 640                 #self.driver.BindObjectToPeer('slice', slice['slice_id'], peer, slice['peer_slice_id'])
 641
 642         #return 1
 643