sfa/planetlab/plslices.py

   1 import time
   2 from types import StringTypes
   3 from collections import defaultdict
   4
   5 from sfa.util.sfatime import utcparse, datetime_to_epoch
   6 from sfa.util.sfalogging import logger
   7 from sfa.util.xrn import Xrn, get_leaf, get_authority, urn_to_hrn
   8 from sfa.rspecs.rspec import RSpec
   9 from sfa.planetlab.vlink import VLink
  10 from sfa.planetlab.topology import Topology
  11 from sfa.planetlab.plxrn import PlXrn, hrn_to_pl_slicename, xrn_to_hostname, top_auth, hash_loginbase
  12 from sfa.storage.model import SliverAllocation
  13
  14 MAXINT =  2L**31-1
  15
  16 class PlSlices:
  17
  18     rspec_to_slice_tag = {'max_rate':'net_max_rate'}
  19
  20     def __init__(self, driver):
  21         self.driver = driver
  22
  23     def get_slivers(self, xrn, node=None):
  24         hrn, type = urn_to_hrn(xrn)
  25
  26         slice_name = hrn_to_pl_slicename(hrn)
  27         # XX Should we just call PLCAPI.GetSliceTicket(slice_name) instead
  28         # of doing all of this?
  29         #return self.driver.shell.GetSliceTicket(self.auth, slice_name)
  30
  31         # from PLCAPI.GetSlivers.get_slivers()
  32         slice_fields = ['slice_id', 'name', 'instantiation', 'expires', 'person_ids', 'slice_tag_ids']
  33         slices = self.driver.shell.GetSlices(slice_name, slice_fields)
  34         # Build up list of users and slice attributes
  35         person_ids = set()
  36         all_slice_tag_ids = set()
  37         for slice in slices:
  38             person_ids.update(slice['person_ids'])
  39             all_slice_tag_ids.update(slice['slice_tag_ids'])
  40         person_ids = list(person_ids)
  41         all_slice_tag_ids = list(all_slice_tag_ids)
  42         # Get user information
  43         all_persons_list = self.driver.shell.GetPersons({'person_id':person_ids,'enabled':True}, ['person_id', 'enabled', 'key_ids'])
  44         all_persons = {}
  45         for person in all_persons_list:
  46             all_persons[person['person_id']] = person
  47
  48         # Build up list of keys
  49         key_ids = set()
  50         for person in all_persons.values():
  51             key_ids.update(person['key_ids'])
  52         key_ids = list(key_ids)
  53         # Get user account keys
  54         all_keys_list = self.driver.shell.GetKeys(key_ids, ['key_id', 'key', 'key_type'])
  55         all_keys = {}
  56         for key in all_keys_list:
  57             all_keys[key['key_id']] = key
  58         # Get slice attributes
  59         all_slice_tags_list = self.driver.shell.GetSliceTags(all_slice_tag_ids)
  60         all_slice_tags = {}
  61         for slice_tag in all_slice_tags_list:
  62             all_slice_tags[slice_tag['slice_tag_id']] = slice_tag
  63
  64         slivers = []
  65         for slice in slices:
  66             keys = []
  67             for person_id in slice['person_ids']:
  68                 if person_id in all_persons:
  69                     person = all_persons[person_id]
  70                     if not person['enabled']:
  71                         continue
  72                     for key_id in person['key_ids']:
  73                         if key_id in all_keys:
  74                             key = all_keys[key_id]
  75                             keys += [{'key_type': key['key_type'],
  76                                     'key': key['key']}]
  77             attributes = []
  78             # All (per-node and global) attributes for this slice
  79             slice_tags = []
  80             for slice_tag_id in slice['slice_tag_ids']:
  81                 if slice_tag_id in all_slice_tags:
  82                     slice_tags.append(all_slice_tags[slice_tag_id])
  83             # Per-node sliver attributes take precedence over global
  84             # slice attributes, so set them first.
  85             # Then comes nodegroup slice attributes
  86             # Followed by global slice attributes
  87             sliver_attributes = []
  88
  89             if node is not None:
  90                 for sliver_attribute in filter(lambda a: a['node_id'] == node['node_id'], slice_tags):
  91                     sliver_attributes.append(sliver_attribute['tagname'])
  92                     attributes.append({'tagname': sliver_attribute['tagname'],
  93                                     'value': sliver_attribute['value']})
  94
  95             # set nodegroup slice attributes
  96             for slice_tag in filter(lambda a: a['nodegroup_id'] in node['nodegroup_ids'], slice_tags):
  97                 # Do not set any nodegroup slice attributes for
  98                 # which there is at least one sliver attribute
  99                 # already set.
 100                 if slice_tag not in slice_tags:
 101                     attributes.append({'tagname': slice_tag['tagname'],
 102                         'value': slice_tag['value']})
 103
 104             for slice_tag in filter(lambda a: a['node_id'] is None, slice_tags):
 105                 # Do not set any global slice attributes for
 106                 # which there is at least one sliver attribute
 107                 # already set.
 108                 if slice_tag['tagname'] not in sliver_attributes:
 109                     attributes.append({'tagname': slice_tag['tagname'],
 110                                    'value': slice_tag['value']})
 111
 112             # XXX Sanity check; though technically this should be a system invariant
 113             # checked with an assertion
 114             if slice['expires'] > MAXINT:  slice['expires']= MAXINT
 115
 116             slivers.append({
 117                 'hrn': hrn,
 118                 'name': slice['name'],
 119                 'slice_id': slice['slice_id'],
 120                 'instantiation': slice['instantiation'],
 121                 'expires': slice['expires'],
 122                 'keys': keys,
 123                 'attributes': attributes
 124             })
 125
 126         return slivers
 127
 128     def get_peer(self, xrn):
 129         hrn, type = urn_to_hrn(xrn)
 130         # Becaues of myplc federation,  we first need to determine if this
 131         # slice belongs to out local plc or a myplc peer. We will assume it
 132         # is a local site, unless we find out otherwise
 133         peer = None
 134
 135         # get this slice's authority (site)
 136         slice_authority = get_authority(hrn)
 137
 138         # get this site's authority (sfa root authority or sub authority)
 139         site_authority = get_authority(slice_authority).lower()
 140
 141         # check if we are already peered with this site_authority, if so
 142         peers = self.driver.shell.GetPeers({}, ['peer_id', 'peername', 'shortname', 'hrn_root'])
 143         for peer_record in peers:
 144             names = [name.lower() for name in peer_record.values() if isinstance(name, StringTypes)]
 145             if site_authority in names:
 146                 peer = peer_record
 147
 148         return peer
 149
 150     def get_sfa_peer(self, xrn):
 151         hrn, type = urn_to_hrn(xrn)
 152
 153         # return the authority for this hrn or None if we are the authority
 154         sfa_peer = None
 155         slice_authority = get_authority(hrn)
 156         site_authority = get_authority(slice_authority)
 157
 158         if site_authority != self.driver.hrn:
 159             sfa_peer = site_authority
 160
 161         return sfa_peer
 162
 163     def verify_slice_leases(self, slice, rspec_requested_leases, peer):
 164
 165         leases = self.driver.shell.GetLeases({'name':slice['name'], 'clip':int(time.time())}, ['lease_id','name', 'hostname', 't_from', 't_until'])
 166         grain = self.driver.shell.GetLeaseGranularity()
 167
 168         requested_leases = []
 169         for lease in rspec_requested_leases:
 170              requested_lease = {}
 171              slice_hrn, _ = urn_to_hrn(lease['slice_id'])
 172
 173              top_auth_hrn = top_auth(slice_hrn)
 174              site_hrn = '.'.join(slice_hrn.split('.')[:-1])
 175              slice_part = slice_hrn.split('.')[-1]
 176              if top_auth_hrn == self.driver.hrn:
 177                  login_base = slice_hrn.split('.')[-2][:12]
 178              else:
 179                  login_base = hash_loginbase(site_hrn)
 180
 181              slice_name = '_'.join([login_base, slice_part])
 182
 183              if slice_name != slice['name']:
 184                  continue
 185              elif Xrn(lease['component_id']).get_authority_urn().split(':')[0] != self.driver.hrn:
 186                  continue
 187
 188              hostname = xrn_to_hostname(lease['component_id'])
 189              # fill the requested node with nitos ids
 190              requested_lease['name'] = slice['name']
 191              requested_lease['hostname'] = hostname
 192              requested_lease['t_from'] = int(lease['start_time'])
 193              requested_lease['t_until'] = int(lease['duration']) * grain + int(lease['start_time'])
 194              requested_leases.append(requested_lease)
 195
 196
 197
 198         # prepare actual slice leases by lease_id
 199         leases_by_id = {}
 200         for lease in leases:
 201              leases_by_id[lease['lease_id']] = {'name': lease['name'], 'hostname': lease['hostname'], \
 202                                                 't_from': lease['t_from'], 't_until': lease['t_until']}
 203
 204         added_leases = []
 205         kept_leases_id = []
 206         deleted_leases_id = []
 207         for lease_id in leases_by_id:
 208              if leases_by_id[lease_id] not in requested_leases:
 209                  deleted_leases_id.append(lease_id)
 210              else:
 211                  kept_leases_id.append(lease_id)
 212                  requested_leases.remove(leases_by_id[lease_id])
 213         added_leases = requested_leases
 214
 215
 216         try:
 217             if peer:
 218                 self.driver.shell.UnBindObjectFromPeer('slice', slice['slice_id'], peer['shortname'])
 219             self.driver.shell.DeleteLeases(deleted_leases_id)
 220             for lease in added_leases:
 221                 self.driver.shell.AddLeases(lease['hostname'], slice['name'], lease['t_from'], lease['t_until'])
 222
 223         except:
 224             logger.log_exc('Failed to add/remove slice leases')
 225
 226         return leases
 227
 228
 229     def verify_slice_nodes(self, slice_urn, slice, rspec_nodes, peer):
 230
 231         slivers = {}
 232         for node in rspec_nodes:
 233             hostname = node.get('component_name')
 234             client_id = node.get('client_id')
 235             component_id = node.get('component_id').strip()
 236             if hostname:
 237                 hostname = hostname.strip()
 238             elif component_id:
 239                 hostname = xrn_to_hostname(component_id)
 240             if hostname:
 241                 slivers[hostname] = {'client_id': client_id, 'component_id': component_id}
 242
 243         nodes = self.driver.shell.GetNodes(slice['node_ids'], ['node_id', 'hostname', 'interface_ids'])
 244         current_slivers = [node['hostname'] for node in nodes]
 245
 246         # remove nodes not in rspec
 247         deleted_nodes = list(set(current_slivers).difference(slivers.keys()))
 248
 249         # add nodes from rspec
 250         added_nodes = list(set(slivers.keys()).difference(current_slivers))
 251
 252         try:
 253             if peer:
 254                 self.driver.shell.UnBindObjectFromPeer('slice', slice['slice_id'], peer['shortname'])
 255             self.driver.shell.AddSliceToNodes(slice['name'], added_nodes)
 256             self.driver.shell.DeleteSliceFromNodes(slice['name'], deleted_nodes)
 257
 258         except:
 259             logger.log_exc('Failed to add/remove slice from nodes')
 260
 261         slices = self.driver.shell.GetSlices(slice['name'], ['node_ids'])
 262         resulting_nodes = self.driver.shell.GetNodes(slices[0]['node_ids'])
 263
 264         # update sliver allocations
 265         for node in resulting_nodes:
 266             client_id = slivers[node['hostname']]['client_id']
 267             component_id = slivers[node['hostname']]['component_id']
 268             sliver_hrn = '%s.%s-%s' % (self.driver.hrn, slice['slice_id'], node['node_id'])
 269             sliver_id = Xrn(sliver_hrn, type='sliver').urn
 270             record = SliverAllocation(sliver_id=sliver_id, client_id=client_id,
 271                                       component_id=component_id,
 272                                       slice_urn = slice_urn,
 273                                       allocation_state='geni_allocated')
 274             record.sync(self.driver.api.dbsession())
 275         return resulting_nodes
 276
 277     def free_egre_key(self):
 278         used = set()
 279         for tag in self.driver.shell.GetSliceTags({'tagname': 'egre_key'}):
 280                 used.add(int(tag['value']))
 281
 282         for i in range(1, 256):
 283             if i not in used:
 284                 key = i
 285                 break
 286         else:
 287             raise KeyError("No more EGRE keys available")
 288
 289         return str(key)
 290
 291     def verify_slice_links(self, slice, requested_links, nodes):
 292
 293         if not requested_links:
 294             return
 295
 296         # exit if links are not supported here
 297         topology = Topology()
 298         if not topology:
 299             return
 300
 301         # build dict of nodes
 302         nodes_dict = {}
 303         interface_ids = []
 304         for node in nodes:
 305             nodes_dict[node['node_id']] = node
 306             interface_ids.extend(node['interface_ids'])
 307         # build dict of interfaces
 308         interfaces = self.driver.shell.GetInterfaces(interface_ids)
 309         interfaces_dict = {}
 310         for interface in interfaces:
 311             interfaces_dict[interface['interface_id']] = interface
 312
 313         slice_tags = []
 314
 315         # set egre key
 316         slice_tags.append({'name': 'egre_key', 'value': self.free_egre_key()})
 317
 318         # set netns
 319         slice_tags.append({'name': 'netns', 'value': '1'})
 320
 321         # set cap_net_admin
 322         # need to update the attribute string?
 323         slice_tags.append({'name': 'capabilities', 'value': 'CAP_NET_ADMIN'})
 324
 325         for link in requested_links:
 326             # get the ip address of the first node in the link
 327             ifname1 = Xrn(link['interface1']['component_id']).get_leaf()
 328
 329             if ifname1:
 330                 ifname_parts = ifname1.split(':')
 331                 node_raw = ifname_parts[0]
 332                 device = None
 333                 if len(ifname_parts) > 1:
 334                     device = ifname_parts[1]
 335                 node_id = int(node_raw.replace('node', ''))
 336                 node = nodes_dict[node_id]
 337                 if1 = interfaces_dict[node['interface_ids'][0]]
 338                 ipaddr = if1['ip']
 339                 topo_rspec = VLink.get_topo_rspec(link, ipaddr)
 340                 # set topo_rspec tag
 341                 slice_tags.append({'name': 'topo_rspec', 'value': str([topo_rspec]), 'node_id': node_id})
 342                 # set vini_topo tag
 343                 slice_tags.append({'name': 'vini_topo', 'value': 'manual', 'node_id': node_id})
 344                 #self.driver.shell.AddSliceTag(slice['name'], 'topo_rspec', str([topo_rspec]), node_id)
 345
 346         self.verify_slice_attributes(slice, slice_tags, {'append': True}, admin=True)
 347
 348
 349
 350     def handle_peer(self, site, slice, persons, peer):
 351         if peer:
 352             # bind site
 353             try:
 354                 if site:
 355                     self.driver.shell.BindObjectToPeer('site', site['site_id'], peer['shortname'], slice['site_id'])
 356             except Exception,e:
 357                 self.driver.shell.DeleteSite(site['site_id'])
 358                 raise e
 359
 360             # bind slice
 361             try:
 362                 if slice:
 363                     self.driver.shell.BindObjectToPeer('slice', slice['slice_id'], peer['shortname'], slice['slice_id'])
 364             except Exception,e:
 365                 self.driver.shell.DeleteSlice(slice['slice_id'])
 366                 raise e
 367
 368             # bind persons
 369             for person in persons:
 370                 try:
 371                     self.driver.shell.BindObjectToPeer('person',
 372                                                      person['person_id'], peer['shortname'], person['peer_person_id'])
 373
 374                     for (key, remote_key_id) in zip(person['keys'], person['key_ids']):
 375                         try:
 376                             self.driver.shell.BindObjectToPeer( 'key', key['key_id'], peer['shortname'], remote_key_id)
 377                         except:
 378                             self.driver.shell.DeleteKey(key['key_id'])
 379                             logger("failed to bind key: %s to peer: %s " % (key['key_id'], peer['shortname']))
 380                 except Exception,e:
 381                     self.driver.shell.DeletePerson(person['person_id'])
 382                     raise e
 383
 384         return slice
 385
 386     def verify_site(self, slice_xrn, slice_record={}, peer=None, sfa_peer=None, options={}):
 387         (slice_hrn, type) = urn_to_hrn(slice_xrn)
 388         top_auth_hrn = top_auth(slice_hrn)
 389         site_hrn = '.'.join(slice_hrn.split('.')[:-1])
 390         if top_auth_hrn == self.driver.hrn:
 391             login_base = slice_hrn.split('.')[-2][:12]
 392         else:
 393             login_base = hash_loginbase(site_hrn)
 394
 395         sites = self.driver.shell.GetSites({'peer_id': None},['site_id','name','abbreviated_name','login_base','hrn'])
 396
 397         # filter sites by hrn
 398         site_exists = [site for site in sites if site['hrn'] == site_hrn]
 399
 400         if not site_exists:
 401             # create new site record
 402             site = {'name': 'sfa:%s' % site_hrn,
 403                     'abbreviated_name': site_hrn,
 404                     'login_base': login_base,
 405                     'max_slices': 100,
 406                     'max_slivers': 1000,
 407                     'enabled': True,
 408                     'peer_site_id': None}
 409
 410             site['site_id'] = self.driver.shell.AddSite(site)
 411             # Set site HRN
 412             self.driver.shell.SetSiteHrn(int(site['site_id']), site_hrn)
 413             # Tag this as created through SFA
 414             self.driver.shell.SetSiteSfaCreated(int(site['site_id']), 'True')
 415             # exempt federated sites from monitor policies
 416             self.driver.shell.AddSiteTag(int(site['site_id']), 'exempt_site_until', "20200101")
 417
 418         else:
 419             site =  site_exists[0]
 420
 421         return site
 422
 423
 424     def verify_slice(self, slice_hrn, slice_record, peer, sfa_peer, expiration, options={}):
 425         top_auth_hrn = top_auth(slice_hrn)
 426         site_hrn = '.'.join(slice_hrn.split('.')[:-1])
 427         slice_part = slice_hrn.split('.')[-1]
 428         if top_auth_hrn == self.driver.hrn:
 429             login_base = slice_hrn.split('.')[-2][:12]
 430         else:
 431             login_base = hash_loginbase(site_hrn)
 432
 433
 434         slice_name = '_'.join([login_base, slice_part])
 435
 436         slices = self.driver.shell.GetSlices({'peer_id': None},['slice_id','name','hrn'])
 437         # Filter slices by HRN
 438         slice_exists = [slice for slice in slices if slice['hrn'] == slice_hrn]
 439         expires = int(datetime_to_epoch(utcparse(expiration)))
 440         if not slice_exists:
 441             slice = {'name': slice_name,
 442                      'url': slice_record.get('url', slice_hrn),
 443                      'description': slice_record.get('description', slice_hrn)}
 444             # add the slice
 445             slice['slice_id'] = self.driver.shell.AddSlice(slice)
 446             # set the slice HRN
 447             self.driver.shell.SetSliceHrn(int(slice['slice_id']), slice_hrn)
 448             # Tag this as created through SFA
 449             self.driver.shell.SetSliceSfaCreated(int(slice['slice_id']), 'True')
 450             # set the expiration
 451             self.driver.shell.UpdateSlice(int(slice['slice_id']), {'expires': expires})
 452
 453         else:
 454             slice = slice_exists[0]
 455             #Update expiration if necessary
 456             if slice.get('expires', None) != expires:
 457                 self.driver.shell.UpdateSlice( int(slice['slice_id']), {'expires' : expires})
 458
 459         return self.driver.shell.GetSlices(int(slice['slice_id']))[0]
 460
 461
 462     def verify_persons(self, slice_hrn, slice_record, users, peer, sfa_peer, options={}):
 463         top_auth_hrn = top_auth(slice_hrn)
 464         site_hrn = '.'.join(slice_hrn.split('.')[:-1])
 465         slice_part = slice_hrn.split('.')[-1]
 466         users_by_hrn = {}
 467         for user in users:
 468            user['hrn'], _ = urn_to_hrn(user['urn'])
 469            users_by_hrn[user['hrn']] = user
 470
 471         if top_auth_hrn == self.driver.hrn:
 472             login_base = slice_hrn.split('.')[-2][:12]
 473         else:
 474             login_base = hash_loginbase(site_hrn)
 475
 476         slice_name = '_'.join([login_base, slice_part])
 477
 478         persons = self.driver.shell.GetPersons({'peer_id': None},['person_id','email','hrn'])
 479         site = self.driver.shell.GetSites({'peer_id': None, 'login_base': login_base})[0]
 480         slice = self.driver.shell.GetSlices({'peer_id': None, 'name': slice_name})[0]
 481         slice_persons = self.driver.shell.GetPersons({'peer_id': None, 'person_id': slice['person_ids']},['person_id','email','hrn'])
 482
 483         persons_by_hrn = {}
 484         persons_by_email = {}
 485         for person in persons:
 486            persons_by_hrn[person['hrn']] = person
 487            persons_by_email[person['email']] = person
 488         slice_persons_by_hrn = {}
 489         for slice_person in slice_persons:
 490            slice_persons_by_hrn[slice_person['hrn']] = slice_person
 491
 492         # sort persons by HRN
 493         persons_to_add = set(users_by_hrn.keys()).difference(slice_persons_by_hrn.keys())
 494         persons_to_delete = set(slice_persons_by_hrn.keys()).difference(users_by_hrn.keys())
 495         persons_to_keep = set(users_by_hrn.keys()).intersection(slice_persons_by_hrn.keys())
 496
 497
 498         persons_to_verify_keys = {}
 499
 500         # Add persons or add persons to slice
 501         for person_hrn in persons_to_add:
 502              person_email = users_by_hrn[person_hrn].get('email', None)
 503              if person_email and person_email in persons_by_email.keys():
 504                  # check if the user already exist in PL
 505                  person_id = persons_by_email[person_email]['person_id']
 506                  self.driver.shell.AddPersonToSlice(person_id, slice['slice_id'])
 507                  persons_to_verify_keys[person_id] = users_by_hrn[person_hrn]
 508
 509              else:
 510                  person = {
 511                            'first_name': person_hrn,
 512                            'last_name': person_hrn,
 513                            'email': users_by_hrn[person_hrn].get('email', "%s@geni.net"%person_hrn.split('.')[-1]),
 514                           }
 515
 516                  person_id = self.driver.shell.AddPerson(person)
 517                  self.driver.shell.AddRoleToPerson('user', int(person_id))
 518                  # enable the account
 519                  self.driver.shell.UpdatePerson(int(person_id), {'enabled': True})
 520                  self.driver.shell.SetPersonHrn(int(person_id), person_hrn)
 521                  self.driver.shell.SetPersonSfaCreated(int(person_id), 'True')
 522                  self.driver.shell.AddPersonToSite(int(person_id), site['site_id'])
 523                  self.driver.shell.AddPersonToSlice(int(person_id), slice['slice_id'])
 524
 525                  # Add keys
 526                  for key in users_by_hrn[person_hrn].get('keys', []):
 527                       key = {'key':key, 'key_type':'ssh'}
 528                       self.driver.shell.AddPersonKey(person_id, key)
 529
 530
 531         # Delete persons from slice
 532         for person_hrn in persons_to_delete:
 533              person_id = slice_persons_by_hrn[person_hrn].get('person_id')
 534              slice_id = slice['slice_id']
 535              self.driver.shell.DeletePersonFromSlice(person_id, slice_id)
 536
 537
 538         # Update kept persons
 539         for person_hrn in persons_to_keep:
 540              person_id = slice_persons_by_hrn[person_hrn].get('person_id')
 541              persons_to_verify_keys[person_id] = users_by_hrn[person_hrn]
 542
 543         self.verify_keys(persons_to_verify_keys, peer, options)
 544
 545         return persons_to_add
 546
 547
 548     def verify_keys(self, persons_to_verify_keys, peer, options={}):
 549         # we only add keys that comes from sfa to persons in PL
 550         for person_id in persons_to_verify_keys:
 551              person_sfa_keys = persons_to_verify_keys[person_id].get('keys', [])
 552              person_pl_keys = self.driver.shell.GetKeys({'person_id': int(person_id)})
 553              person_pl_keys_list = [key['key'] for key in person_pl_keys]
 554
 555              keys_to_add = set(person_sfa_keys).difference(person_pl_keys_list)
 556
 557              for key_string in keys_to_add:
 558                   key = {'key': key_string, 'key_type': 'ssh'}
 559                   self.driver.shell.AddPersonKey(int(person_id), key)
 560
 561
 562     def verify_slice_attributes(self, slice, requested_slice_attributes, options={}, admin=False):
 563         append = options.get('append', True)
 564         # get list of attributes users ar able to manage
 565         filter = {'category': '*slice*'}
 566         if not admin:
 567             filter['|roles'] = ['user']
 568         slice_attributes = self.driver.shell.GetTagTypes(filter)
 569         valid_slice_attribute_names = [attribute['tagname'] for attribute in slice_attributes]
 570
 571         # get sliver attributes
 572         added_slice_attributes = []
 573         removed_slice_attributes = []
 574         # we need to keep the slice hrn anyway
 575         ignored_slice_attribute_names = ['hrn']
 576         existing_slice_attributes = self.driver.shell.GetSliceTags({'slice_id': slice['slice_id']})
 577
 578         # get attributes that should be removed
 579         for slice_tag in existing_slice_attributes:
 580             if slice_tag['tagname'] in ignored_slice_attribute_names:
 581                 # If a slice already has a admin only role it was probably given to them by an
 582                 # admin, so we should ignore it.
 583                 ignored_slice_attribute_names.append(slice_tag['tagname'])
 584                 attribute_found=True
 585             else:
 586                 # If an existing slice attribute was not found in the request it should
 587                 # be removed
 588                 attribute_found=False
 589                 for requested_attribute in requested_slice_attributes:
 590                     if requested_attribute['name'] == slice_tag['tagname'] and \
 591                        requested_attribute['value'] == slice_tag['value']:
 592                         attribute_found=True
 593                         break
 594
 595             if not attribute_found and not append:
 596                 removed_slice_attributes.append(slice_tag)
 597
 598         # get attributes that should be added:
 599         for requested_attribute in requested_slice_attributes:
 600             # if the requested attribute wasn't found  we should add it
 601             if requested_attribute['name'] in valid_slice_attribute_names:
 602                 attribute_found = False
 603                 for existing_attribute in existing_slice_attributes:
 604                     if requested_attribute['name'] == existing_attribute['tagname'] and \
 605                        requested_attribute['value'] == existing_attribute['value']:
 606                         attribute_found=True
 607                         break
 608                 if not attribute_found:
 609                     added_slice_attributes.append(requested_attribute)
 610
 611
 612         # remove stale attributes
 613         for attribute in removed_slice_attributes:
 614             try:
 615                 self.driver.shell.DeleteSliceTag(attribute['slice_tag_id'])
 616             except Exception, e:
 617                 logger.warn('Failed to remove sliver attribute. name: %s, value: %s, node_id: %s\nCause:%s'\
 618                                 % (slice['name'], attribute['value'],  attribute.get('node_id'), str(e)))
 619
 620         # add requested_attributes
 621         for attribute in added_slice_attributes:
 622             try:
 623                 self.driver.shell.AddSliceTag(slice['name'], attribute['name'], attribute['value'], attribute.get('node_id', None))
 624             except Exception, e:
 625                 logger.warn('Failed to add sliver attribute. name: %s, value: %s, node_id: %s\nCause:%s'\
 626                                 % (slice['name'], attribute['value'],  attribute.get('node_id'), str(e)))
 627