sfa/planetlab/plslices.py

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