sfa/managers/slice_manager.py

   1 import sys
   2 import time
   3 import traceback
   4 from StringIO import StringIO
   5 from copy import copy
   6 from lxml import etree
   7
   8 from sfa.trust.sfaticket import SfaTicket
   9 from sfa.trust.credential import Credential
  10
  11 from sfa.util.sfalogging import logger
  12 from sfa.util.xrn import Xrn, urn_to_hrn
  13 from sfa.util.version import version_core
  14 from sfa.util.callids import Callids
  15 from sfa.util.cache import Cache
  16
  17 from sfa.server.threadmanager import ThreadManager
  18
  19 from sfa.rspecs.rspec_converter import RSpecConverter
  20 from sfa.rspecs.version_manager import VersionManager
  21 from sfa.rspecs.rspec import RSpec
  22
  23 from sfa.client.client_helper import sfa_to_pg_users_arg
  24 from sfa.client.return_value import ReturnValue
  25
  26 class SliceManager:
  27
  28     # the cache instance is a class member so it survives across incoming requests
  29     cache = None
  30
  31     def __init__ (self, config):
  32         self.cache=None
  33         if config.SFA_SM_CACHING:
  34             if SliceManager.cache is None:
  35                 SliceManager.cache = Cache()
  36             self.cache = SliceManager.cache
  37
  38     def GetVersion(self, api, options):
  39         # peers explicitly in aggregates.xml
  40         peers =dict ([ (peername,interface.get_url()) for (peername,interface) in api.aggregates.iteritems()
  41                        if peername != api.hrn])
  42         version_manager = VersionManager()
  43         ad_rspec_versions = []
  44         request_rspec_versions = []
  45         for rspec_version in version_manager.versions:
  46             if rspec_version.content_type in ['*', 'ad']:
  47                 ad_rspec_versions.append(rspec_version.to_dict())
  48             if rspec_version.content_type in ['*', 'request']:
  49                 request_rspec_versions.append(rspec_version.to_dict())
  50         xrn=Xrn(api.hrn, 'authority+sa')
  51         version_more = {
  52             'interface':'slicemgr',
  53             'sfa': 2,
  54             'geni_api': 2,
  55             'geni_api_versions': {'2': 'http://%s:%s' % (api.config.SFA_SM_HOST, api.config.SFA_SM_PORT)},
  56             'hrn' : xrn.get_hrn(),
  57             'urn' : xrn.get_urn(),
  58             'peers': peers,
  59             'geni_request_rspec_versions': request_rspec_versions,
  60             'geni_ad_rspec_versions': ad_rspec_versions,
  61             }
  62         sm_version=version_core(version_more)
  63         # local aggregate if present needs to have localhost resolved
  64         if api.hrn in api.aggregates:
  65             local_am_url=api.aggregates[api.hrn].get_url()
  66             sm_version['peers'][api.hrn]=local_am_url.replace('localhost',sm_version['hostname'])
  67         return sm_version
  68
  69     def drop_slicemgr_stats(self, rspec):
  70         try:
  71             stats_elements = rspec.xml.xpath('//statistics')
  72             for node in stats_elements:
  73                 node.getparent().remove(node)
  74         except Exception, e:
  75             logger.warn("drop_slicemgr_stats failed: %s " % (str(e)))
  76
  77     def add_slicemgr_stat(self, rspec, callname, aggname, elapsed, status, exc_info=None):
  78         try:
  79             stats_tags = rspec.xml.xpath('//statistics[@call="%s"]' % callname)
  80             if stats_tags:
  81                 stats_tag = stats_tags[0]
  82             else:
  83                 stats_tag = rspec.xml.root.add_element("statistics", call=callname)
  84
  85             stat_tag = stats_tag.add_element("aggregate", name=str(aggname),
  86                                              elapsed=str(elapsed), status=str(status))
  87
  88             if exc_info:
  89                 exc_tag = stat_tag.add_element("exc_info", name=str(exc_info[1]))
  90
  91                 # formats the traceback as one big text blob
  92                 #exc_tag.text = "\n".join(traceback.format_exception(exc_info[0], exc_info[1], exc_info[2]))
  93
  94                 # formats the traceback as a set of xml elements
  95                 tb = traceback.extract_tb(exc_info[2])
  96                 for item in tb:
  97                     exc_frame = exc_tag.add_element("tb_frame", filename=str(item[0]),
  98                                                     line=str(item[1]), func=str(item[2]), code=str(item[3]))
  99
 100         except Exception, e:
 101             logger.warn("add_slicemgr_stat failed on  %s: %s" %(aggname, str(e)))
 102
 103     def ListResources(self, api, creds, options):
 104         call_id = options.get('call_id')
 105         if Callids().already_handled(call_id): return ""
 106
 107         version_manager = VersionManager()
 108
 109         def _ListResources(aggregate, server, credential, options):
 110             forward_options = copy(options)
 111             tStart = time.time()
 112             try:
 113                 version = api.get_cached_server_version(server)
 114                 # force ProtoGENI aggregates to give us a v2 RSpec
 115                 if 'sfa' in version.keys():
 116                     forward_options['rspec_version'] = version_manager.get_version('SFA 1').to_dict()
 117                 else:
 118                     forward_options['rspec_version'] = version_manager.get_version('ProtoGENI 2').to_dict()
 119                     forward_options['geni_rspec_version'] = {'type': 'geni', 'version': '3.0'}
 120                 rspec = server.ListResources(credential, forward_options)
 121                 return {"aggregate": aggregate, "rspec": rspec, "elapsed": time.time()-tStart, "status": "success"}
 122             except Exception, e:
 123                 api.logger.log_exc("ListResources failed at %s" %(server.url))
 124                 return {"aggregate": aggregate, "elapsed": time.time()-tStart, "status": "exception", "exc_info": sys.exc_info()}
 125
 126         # get slice's hrn from options
 127         xrn = options.get('geni_slice_urn', '')
 128         (hrn, type) = urn_to_hrn(xrn)
 129         if 'geni_compressed' in options:
 130             del(options['geni_compressed'])
 131
 132         # get the rspec's return format from options
 133         rspec_version = version_manager.get_version(options.get('geni_rspec_version'))
 134         version_string = "rspec_%s" % (rspec_version)
 135
 136         # look in cache first
 137         cached_requested = options.get('cached', True)
 138         if not xrn and self.cache and cached_request:
 139             rspec =  self.cache.get(version_string)
 140             if rspec:
 141                 api.logger.debug("SliceManager.ListResources returns cached advertisement")
 142                 return rspec
 143
 144         # get the callers hrn
 145         valid_cred = api.auth.checkCredentials(creds, 'listnodes', hrn)[0]
 146         caller_hrn = Credential(string=valid_cred).get_gid_caller().get_hrn()
 147
 148         # attempt to use delegated credential first
 149         cred = api.getDelegatedCredential(creds)
 150         if not cred:
 151             cred = api.getCredential()
 152         threads = ThreadManager()
 153         for aggregate in api.aggregates:
 154             # prevent infinite loop. Dont send request back to caller
 155             # unless the caller is the aggregate's SM
 156             if caller_hrn == aggregate and aggregate != api.hrn:
 157                 continue
 158
 159             # get the rspec from the aggregate
 160             interface = api.aggregates[aggregate]
 161             server = api.server_proxy(interface, cred)
 162             threads.run(_ListResources, aggregate, server, [cred], options)
 163
 164
 165         results = threads.get_results()
 166         rspec_version = version_manager.get_version(options.get('geni_rspec_version'))
 167         if xrn:
 168             result_version = version_manager._get_version(rspec_version.type, rspec_version.version, 'manifest')
 169         else:
 170             result_version = version_manager._get_version(rspec_version.type, rspec_version.version, 'ad')
 171         rspec = RSpec(version=result_version)
 172         for result in results:
 173             self.add_slicemgr_stat(rspec, "ListResources", result["aggregate"], result["elapsed"],
 174                                    result["status"], result.get("exc_info",None))
 175             if result["status"]=="success":
 176                 try:
 177                     rspec.version.merge(ReturnValue.get_value(result["rspec"]))
 178                 except:
 179                     api.logger.log_exc("SM.ListResources: Failed to merge aggregate rspec")
 180
 181         # cache the result
 182         if self.cache and not xrn:
 183             api.logger.debug("SliceManager.ListResources caches advertisement")
 184             self.cache.add(version_string, rspec.toxml())
 185
 186         return rspec.toxml()
 187
 188
 189     def CreateSliver(self, api, xrn, creds, rspec_str, users, options):
 190         call_id = options.get('call_id')
 191         if Callids().already_handled(call_id): return ""
 192
 193         version_manager = VersionManager()
 194         def _CreateSliver(aggregate, server, xrn, credential, rspec, users, options):
 195             tStart = time.time()
 196             try:
 197                 # Need to call GetVersion at an aggregate to determine the supported
 198                 # rspec type/format beofre calling CreateSliver at an Aggregate.
 199                 server_version = api.get_cached_server_version(server)
 200                 requested_users = users
 201                 if 'sfa' not in server_version and 'geni_api' in server_version:
 202                     # sfa aggregtes support both sfa and pg rspecs, no need to convert
 203                     # if aggregate supports sfa rspecs. otherwise convert to pg rspec
 204                     rspec = RSpec(RSpecConverter.to_pg_rspec(rspec, 'request'))
 205                     filter = {'component_manager_id': server_version['urn']}
 206                     rspec.filter(filter)
 207                     rspec = rspec.toxml()
 208                     requested_users = sfa_to_pg_users_arg(users)
 209                 rspec = server.CreateSliver(xrn, credential, rspec, requested_users, options)
 210                 return {"aggregate": aggregate, "rspec": rspec, "elapsed": time.time()-tStart, "status": "success"}
 211             except:
 212                 logger.log_exc('Something wrong in _CreateSliver with URL %s'%server.url)
 213                 return {"aggregate": aggregate, "elapsed": time.time()-tStart, "status": "exception", "exc_info": sys.exc_info()}
 214
 215         # Validate the RSpec against PlanetLab's schema --disabled for now
 216         # The schema used here needs to aggregate the PL and VINI schemas
 217         # schema = "/var/www/html/schemas/pl.rng"
 218         rspec = RSpec(rspec_str)
 219     #    schema = None
 220     #    if schema:
 221     #        rspec.validate(schema)
 222
 223         # if there is a <statistics> section, the aggregates don't care about it,
 224         # so delete it.
 225         self.drop_slicemgr_stats(rspec)
 226
 227         # attempt to use delegated credential first
 228         cred = api.getDelegatedCredential(creds)
 229         if not cred:
 230             cred = api.getCredential()
 231
 232         # get the callers hrn
 233         hrn, type = urn_to_hrn(xrn)
 234         valid_cred = api.auth.checkCredentials(creds, 'createsliver', hrn)[0]
 235         caller_hrn = Credential(string=valid_cred).get_gid_caller().get_hrn()
 236         threads = ThreadManager()
 237         for aggregate in api.aggregates:
 238             # prevent infinite loop. Dont send request back to caller
 239             # unless the caller is the aggregate's SM
 240             if caller_hrn == aggregate and aggregate != api.hrn:
 241                 continue
 242             interface = api.aggregates[aggregate]
 243             server = api.server_proxy(interface, cred)
 244             # Just send entire RSpec to each aggregate
 245             threads.run(_CreateSliver, aggregate, server, xrn, [cred], rspec.toxml(), users, options)
 246
 247         results = threads.get_results()
 248         manifest_version = version_manager._get_version(rspec.version.type, rspec.version.version, 'manifest')
 249         result_rspec = RSpec(version=manifest_version)
 250         for result in results:
 251             self.add_slicemgr_stat(result_rspec, "CreateSliver", result["aggregate"], result["elapsed"],
 252                                    result["status"], result.get("exc_info",None))
 253             if result["status"]=="success":
 254                 try:
 255                     result_rspec.version.merge(ReturnValue.get_value(result["rspec"]))
 256                 except:
 257                     api.logger.log_exc("SM.CreateSliver: Failed to merge aggregate rspec")
 258         return result_rspec.toxml()
 259
 260     def RenewSliver(self, api, xrn, creds, expiration_time, options):
 261         call_id = options.get('call_id')
 262         if Callids().already_handled(call_id): return True
 263
 264         def _RenewSliver(server, xrn, creds, expiration_time, options):
 265             return server.RenewSliver(xrn, creds, expiration_time, options)
 266
 267         (hrn, type) = urn_to_hrn(xrn)
 268         # get the callers hrn
 269         valid_cred = api.auth.checkCredentials(creds, 'renewsliver', hrn)[0]
 270         caller_hrn = Credential(string=valid_cred).get_gid_caller().get_hrn()
 271
 272         # attempt to use delegated credential first
 273         cred = api.getDelegatedCredential(creds)
 274         if not cred:
 275             cred = api.getCredential()
 276         threads = ThreadManager()
 277         for aggregate in api.aggregates:
 278             # prevent infinite loop. Dont send request back to caller
 279             # unless the caller is the aggregate's SM
 280             if caller_hrn == aggregate and aggregate != api.hrn:
 281                 continue
 282             interface = api.aggregates[aggregate]
 283             server = api.server_proxy(interface, cred)
 284             threads.run(_RenewSliver, server, xrn, [cred], expiration_time, options)
 285         # 'and' the results
 286         results = [ReturnValue.get_value(result) for result in threads.get_results()]
 287         return reduce (lambda x,y: x and y, results , True)
 288
 289     def DeleteSliver(self, api, xrn, creds, options):
 290         call_id = options.get('call_id')
 291         if Callids().already_handled(call_id): return ""
 292
 293         def _DeleteSliver(server, xrn, creds, options):
 294             return server.DeleteSliver(xrn, creds, options)
 295
 296         (hrn, type) = urn_to_hrn(xrn)
 297         # get the callers hrn
 298         valid_cred = api.auth.checkCredentials(creds, 'deletesliver', hrn)[0]
 299         caller_hrn = Credential(string=valid_cred).get_gid_caller().get_hrn()
 300
 301         # attempt to use delegated credential first
 302         cred = api.getDelegatedCredential(creds)
 303         if not cred:
 304             cred = api.getCredential()
 305         threads = ThreadManager()
 306         for aggregate in api.aggregates:
 307             # prevent infinite loop. Dont send request back to caller
 308             # unless the caller is the aggregate's SM
 309             if caller_hrn == aggregate and aggregate != api.hrn:
 310                 continue
 311             interface = api.aggregates[aggregate]
 312             server = api.server_proxy(interface, cred)
 313             threads.run(_DeleteSliver, server, xrn, [cred], options)
 314         threads.get_results()
 315         return 1
 316
 317
 318     # first draft at a merging SliverStatus
 319     def SliverStatus(self, api, slice_xrn, creds, options):
 320         def _SliverStatus(server, xrn, creds, options):
 321             return server.SliverStatus(xrn, creds, options)
 322
 323         call_id = options.get('call_id')
 324         if Callids().already_handled(call_id): return {}
 325         # attempt to use delegated credential first
 326         cred = api.getDelegatedCredential(creds)
 327         if not cred:
 328             cred = api.getCredential()
 329         threads = ThreadManager()
 330         for aggregate in api.aggregates:
 331             interface = api.aggregates[aggregate]
 332             server = api.server_proxy(interface, cred)
 333             threads.run (_SliverStatus, server, slice_xrn, [cred], options)
 334         results = [ReturnValue.get_value(result) for result in threads.get_results()]
 335
 336         # get rid of any void result - e.g. when call_id was hit, where by convention we return {}
 337         results = [ result for result in results if result and result['geni_resources']]
 338
 339         # do not try to combine if there's no result
 340         if not results : return {}
 341
 342         # otherwise let's merge stuff
 343         overall = {}
 344
 345         # mmh, it is expected that all results carry the same urn
 346         overall['geni_urn'] = results[0]['geni_urn']
 347         overall['pl_login'] = results[0]['pl_login']
 348         # append all geni_resources
 349         overall['geni_resources'] = \
 350             reduce (lambda x,y: x+y, [ result['geni_resources'] for result in results] , [])
 351         overall['status'] = 'unknown'
 352         if overall['geni_resources']:
 353             overall['status'] = 'ready'
 354
 355         return overall
 356
 357     def ListSlices(self, api, creds, options):
 358         call_id = options.get('call_id')
 359         if Callids().already_handled(call_id): return []
 360
 361         def _ListSlices(server, creds, options):
 362             return server.ListSlices(creds, options)
 363
 364         # look in cache first
 365         # xxx is this really frequent enough that it is worth being cached ?
 366         if self.cache:
 367             slices = self.cache.get('slices')
 368             if slices:
 369                 api.logger.debug("SliceManager.ListSlices returns from cache")
 370                 return slices
 371
 372         # get the callers hrn
 373         valid_cred = api.auth.checkCredentials(creds, 'listslices', None)[0]
 374         caller_hrn = Credential(string=valid_cred).get_gid_caller().get_hrn()
 375
 376         # attempt to use delegated credential first
 377         cred= api.getDelegatedCredential(creds)
 378         if not cred:
 379             cred = api.getCredential()
 380         threads = ThreadManager()
 381         # fetch from aggregates
 382         for aggregate in api.aggregates:
 383             # prevent infinite loop. Dont send request back to caller
 384             # unless the caller is the aggregate's SM
 385             if caller_hrn == aggregate and aggregate != api.hrn:
 386                 continue
 387             interface = api.aggregates[aggregate]
 388             server = api.server_proxy(interface, cred)
 389             threads.run(_ListSlices, server, [cred], options)
 390
 391         # combime results
 392         results = [ReturnValue.get_value(result) for result in threads.get_results()]
 393         slices = []
 394         for result in results:
 395             slices.extend(result)
 396
 397         # cache the result
 398         if self.cache:
 399             api.logger.debug("SliceManager.ListSlices caches value")
 400             self.cache.add('slices', slices)
 401
 402         return slices
 403
 404
 405     def GetTicket(self, api, xrn, creds, rspec, users, options):
 406         slice_hrn, type = urn_to_hrn(xrn)
 407         # get the netspecs contained within the clients rspec
 408         aggregate_rspecs = {}
 409         tree= etree.parse(StringIO(rspec))
 410         elements = tree.findall('./network')
 411         for element in elements:
 412             aggregate_hrn = element.values()[0]
 413             aggregate_rspecs[aggregate_hrn] = rspec
 414
 415         # get the callers hrn
 416         valid_cred = api.auth.checkCredentials(creds, 'getticket', slice_hrn)[0]
 417         caller_hrn = Credential(string=valid_cred).get_gid_caller().get_hrn()
 418
 419         # attempt to use delegated credential first
 420         cred = api.getDelegatedCredential(creds)
 421         if not cred:
 422             cred = api.getCredential()
 423         threads = ThreadManager()
 424         for (aggregate, aggregate_rspec) in aggregate_rspecs.iteritems():
 425             # xxx sounds like using call_id here would be safer
 426             # prevent infinite loop. Dont send request back to caller
 427             # unless the caller is the aggregate's SM
 428             if caller_hrn == aggregate and aggregate != api.hrn:
 429                 continue
 430
 431             interface = api.aggregates[aggregate]
 432             server = api.server_proxy(interface, cred)
 433             threads.run(server.GetTicket, xrn, [cred], aggregate_rspec, users, options)
 434
 435         results = threads.get_results()
 436
 437         # gather information from each ticket
 438         rspec = None
 439         initscripts = []
 440         slivers = []
 441         object_gid = None
 442         for result in results:
 443             agg_ticket = SfaTicket(string=result)
 444             attrs = agg_ticket.get_attributes()
 445             if not object_gid:
 446                 object_gid = agg_ticket.get_gid_object()
 447             if not rspec:
 448                 rspec = RSpec(agg_ticket.get_rspec())
 449             else:
 450                 rspec.version.merge(agg_ticket.get_rspec())
 451             initscripts.extend(attrs.get('initscripts', []))
 452             slivers.extend(attrs.get('slivers', []))
 453
 454         # merge info
 455         attributes = {'initscripts': initscripts,
 456                      'slivers': slivers}
 457
 458         # create a new ticket
 459         ticket = SfaTicket(subject = slice_hrn)
 460         ticket.set_gid_caller(api.auth.client_gid)
 461         ticket.set_issuer(key=api.key, subject=api.hrn)
 462         ticket.set_gid_object(object_gid)
 463         ticket.set_pubkey(object_gid.get_pubkey())
 464         #new_ticket.set_parent(api.auth.hierarchy.get_auth_ticket(auth_hrn))
 465         ticket.set_attributes(attributes)
 466         ticket.set_rspec(rspec.toxml())
 467         ticket.encode()
 468         ticket.sign()
 469         return ticket.save_to_string(save_parents=True)
 470
 471     def start_slice(self, api, xrn, creds):
 472         hrn, type = urn_to_hrn(xrn)
 473
 474         # get the callers hrn
 475         valid_cred = api.auth.checkCredentials(creds, 'startslice', hrn)[0]
 476         caller_hrn = Credential(string=valid_cred).get_gid_caller().get_hrn()
 477
 478         # attempt to use delegated credential first
 479         cred = api.getDelegatedCredential(creds)
 480         if not cred:
 481             cred = api.getCredential()
 482         threads = ThreadManager()
 483         for aggregate in api.aggregates:
 484             # prevent infinite loop. Dont send request back to caller
 485             # unless the caller is the aggregate's SM
 486             if caller_hrn == aggregate and aggregate != api.hrn:
 487                 continue
 488             interface = api.aggregates[aggregate]
 489             server = api.server_proxy(interface, cred)
 490             threads.run(server.Start, xrn, cred)
 491         threads.get_results()
 492         return 1
 493
 494     def stop_slice(self, api, xrn, creds):
 495         hrn, type = urn_to_hrn(xrn)
 496
 497         # get the callers hrn
 498         valid_cred = api.auth.checkCredentials(creds, 'stopslice', hrn)[0]
 499         caller_hrn = Credential(string=valid_cred).get_gid_caller().get_hrn()
 500
 501         # attempt to use delegated credential first
 502         cred = api.getDelegatedCredential(creds)
 503         if not cred:
 504             cred = api.getCredential()
 505         threads = ThreadManager()
 506         for aggregate in api.aggregates:
 507             # prevent infinite loop. Dont send request back to caller
 508             # unless the caller is the aggregate's SM
 509             if caller_hrn == aggregate and aggregate != api.hrn:
 510                 continue
 511             interface = api.aggregates[aggregate]
 512             server = api.server_proxy(interface, cred)
 513             threads.run(server.Stop, xrn, cred)
 514         threads.get_results()
 515         return 1
 516
 517     def reset_slice(self, api, xrn):
 518         """
 519         Not implemented
 520         """
 521         return 1
 522
 523     def shutdown(self, api, xrn, creds):
 524         """
 525         Not implemented
 526         """
 527         return 1
 528
 529     def status(self, api, xrn, creds):
 530         """
 531         Not implemented
 532         """
 533         return 1
 534