src/nepi/core/execute.py

   1 #!/usr/bin/env python
   2 # -*- coding: utf-8 -*-
   3
   4 from nepi.core.attributes import Attribute, AttributesMap
   5 from nepi.core.connector import ConnectorTypeBase
   6 from nepi.util import validation
   7 from nepi.util.constants import STATUS_FINISHED, TIME_NOW
   8 from nepi.util.parser._xml import XmlExperimentParser
   9 import sys
  10 import re
  11 import threading
  12 import ConfigParser
  13 import os
  14 import collections
  15 import functools
  16
  17 ATTRIBUTE_PATTERN_BASE = re.compile(r"\{#\[(?P<label>[-a-zA-Z0-9._]*)\](?P<expr>(?P<component>\.addr\[[0-9]+\]|\.route\[[0-9]+\]|\.trace\[[0-9]+\])?.\[(?P<attribute>[-a-zA-Z0-9._]*)\])#}")
  18 ATTRIBUTE_PATTERN_GUID_SUB = r"{#[%(guid)s]%(expr)s#}"
  19 COMPONENT_PATTERN = re.compile(r"(?P<kind>[a-z]*)\[(?P<index>.*)\]")
  20
  21 class ConnectorType(ConnectorTypeBase):
  22     def __init__(self, testbed_id, factory_id, name, max = -1, min = 0):
  23         super(ConnectorType, self).__init__(testbed_id, factory_id, name, max, min)
  24         # from_connections -- connections where the other connector is the "From"
  25         # to_connections -- connections where the other connector is the "To"
  26         # keys in the dictionary correspond to the
  27         # connector_type_id for possible connections. The value is a tuple:
  28         # (can_cross, connect)
  29         # can_cross: indicates if the connection is allowed accros different
  30         #    testbed instances
  31         # code: is the connection function to be invoked when the elements
  32         #    are connected
  33         self._from_connections = dict()
  34         self._to_connections = dict()
  35
  36     def add_from_connection(self, testbed_id, factory_id, name, can_cross,
  37             init_code, compl_code):
  38         type_id = self.make_connector_type_id(testbed_id, factory_id, name)
  39         self._from_connections[type_id] = (can_cross, init_code, compl_code)
  40
  41     def add_to_connection(self, testbed_id, factory_id, name, can_cross,
  42             init_code, compl_code):
  43         type_id = self.make_connector_type_id(testbed_id, factory_id, name)
  44         self._to_connections[type_id] = (can_cross, init_code, compl_code)
  45
  46     def can_connect(self, testbed_id, factory_id, name, count,
  47             must_cross):
  48         connector_type_id = self.make_connector_type_id(testbed_id, factory_id, name)
  49         for lookup_type_id in self._type_resolution_order(connector_type_id):
  50             if lookup_type_id in self._from_connections:
  51                 (can_cross, init_code, compl_code) = self._from_connections[lookup_type_id]
  52             elif lookup_type_id in self._to_connections:
  53                 (can_cross, init_code, compl_code) = self._to_connections[lookup_type_id]
  54             else:
  55                 # keep trying
  56                 continue
  57             return not must_cross or can_cross
  58         else:
  59             return False
  60
  61     def _connect_to_code(self, testbed_id, factory_id, name,
  62             must_cross):
  63         connector_type_id = self.make_connector_type_id(testbed_id, factory_id, name)
  64         for lookup_type_id in self._type_resolution_order(connector_type_id):
  65             if lookup_type_id in self._to_connections:
  66                 (can_cross, init_code, compl_code) = self._to_connections[lookup_type_id]
  67                 if not must_cross or can_cross:
  68                     return (init_code, compl_code)
  69         else:
  70             return (False, False)
  71
  72     def connect_to_init_code(self, testbed_id, factory_id, name, must_cross):
  73         return self._connect_to_code(testbed_id, factory_id, name, must_cross)[0]
  74
  75     def connect_to_compl_code(self, testbed_id, factory_id, name, must_cross):
  76         return self._connect_to_code(testbed_id, factory_id, name, must_cross)[1]
  77
  78 class Factory(AttributesMap):
  79     def __init__(self, factory_id, create_function, start_function,
  80             stop_function, status_function,
  81             configure_function, preconfigure_function,
  82             prestart_function,
  83             allow_addresses = False, has_addresses = False,
  84             allow_routes = False, has_routes = False):
  85         super(Factory, self).__init__()
  86         self._factory_id = factory_id
  87         self._allow_addresses = bool(allow_addresses)
  88         self._allow_routes = bool(allow_routes)
  89         self._has_addresses = bool(has_addresses) or self._allow_addresses
  90         self._has_routes = bool(has_routes) or self._allow_routes
  91         self._create_function = create_function
  92         self._start_function = start_function
  93         self._stop_function = stop_function
  94         self._status_function = status_function
  95         self._configure_function = configure_function
  96         self._preconfigure_function = preconfigure_function
  97         self._prestart_function = prestart_function
  98         self._connector_types = dict()
  99         self._traces = list()
 100         self._tags = list()
 101         self._box_attributes = AttributesMap()
 102
 103     @property
 104     def factory_id(self):
 105         return self._factory_id
 106
 107     @property
 108     def allow_addresses(self):
 109         return self._allow_addresses
 110
 111     @property
 112     def allow_routes(self):
 113         return self._allow_routes
 114
 115     @property
 116     def has_addresses(self):
 117         return self._has_addresses
 118
 119     @property
 120     def has_routes(self):
 121         return self._has_routes
 122
 123     @property
 124     def box_attributes(self):
 125         return self._box_attributes
 126
 127     @property
 128     def create_function(self):
 129         return self._create_function
 130
 131     @property
 132     def prestart_function(self):
 133         return self._prestart_function
 134
 135     @property
 136     def start_function(self):
 137         return self._start_function
 138
 139     @property
 140     def stop_function(self):
 141         return self._stop_function
 142
 143     @property
 144     def status_function(self):
 145         return self._status_function
 146
 147     @property
 148     def configure_function(self):
 149         return self._configure_function
 150
 151     @property
 152     def preconfigure_function(self):
 153         return self._preconfigure_function
 154
 155     @property
 156     def traces(self):
 157         return self._traces
 158
 159     @property
 160     def tags(self):
 161         return self._tags
 162
 163     def connector_type(self, name):
 164         return self._connector_types[name]
 165
 166     def add_connector_type(self, connector_type):
 167         self._connector_types[connector_type.name] = connector_type
 168
 169     def add_trace(self, trace_id):
 170         self._traces.append(trace_id)
 171
 172     def add_tag(self, tag_id):
 173         self._tags.append(tag_id)
 174
 175     def add_box_attribute(self, name, help, type, value = None, range = None,
 176         allowed = None, flags = Attribute.NoFlags, validation_function = None,
 177         category = None):
 178         self._box_attributes.add_attribute(name, help, type, value, range,
 179                 allowed, flags, validation_function, category)
 180
 181 class TestbedController(object):
 182     def __init__(self, testbed_id, testbed_version):
 183         self._testbed_id = testbed_id
 184         self._testbed_version = testbed_version
 185
 186     @property
 187     def testbed_id(self):
 188         return self._testbed_id
 189
 190     @property
 191     def testbed_version(self):
 192         return self._testbed_version
 193
 194     @property
 195     def guids(self):
 196         raise NotImplementedError
 197
 198     def defer_configure(self, name, value):
 199         """Instructs setting a configuartion attribute for the testbed instance"""
 200         raise NotImplementedError
 201
 202     def defer_create(self, guid, factory_id):
 203         """Instructs creation of element """
 204         raise NotImplementedError
 205
 206     def defer_create_set(self, guid, name, value):
 207         """Instructs setting an initial attribute on an element"""
 208         raise NotImplementedError
 209
 210     def defer_factory_set(self, guid, name, value):
 211         """Instructs setting an attribute on a factory"""
 212         raise NotImplementedError
 213
 214     def defer_connect(self, guid1, connector_type_name1, guid2,
 215             connector_type_name2):
 216         """Instructs creation of a connection between the given connectors"""
 217         raise NotImplementedError
 218
 219     def defer_cross_connect(self,
 220             guid, connector_type_name,
 221             cross_guid, cross_testbed_guid,
 222             cross_testbed_id, cross_factory_id,
 223             cross_connector_type_name):
 224         """
 225         Instructs creation of a connection between the given connectors
 226         of different testbed instances
 227         """
 228         raise NotImplementedError
 229
 230     def defer_add_trace(self, guid, trace_id):
 231         """Instructs the addition of a trace"""
 232         raise NotImplementedError
 233
 234     def defer_add_address(self, guid, address, netprefix, broadcast):
 235         """Instructs the addition of an address"""
 236         raise NotImplementedError
 237
 238     def defer_add_route(self, guid, destination, netprefix, nexthop):
 239         """Instructs the addition of a route"""
 240         raise NotImplementedError
 241
 242     def do_setup(self):
 243         """After do_setup the testbed initial configuration is done"""
 244         raise NotImplementedError
 245
 246     def do_create(self):
 247         """
 248         After do_create all instructed elements are created and
 249         attributes setted
 250         """
 251         raise NotImplementedError
 252
 253     def do_connect_init(self):
 254         """
 255         After do_connect_init all internal connections between testbed elements
 256         are initiated
 257         """
 258         raise NotImplementedError
 259
 260     def do_connect_compl(self):
 261         """
 262         After do_connect all internal connections between testbed elements
 263         are completed
 264         """
 265         raise NotImplementedError
 266
 267     def do_preconfigure(self):
 268         """
 269         Done just before resolving netrefs, after connection, before cross connections,
 270         useful for early stages of configuration, for setting up stuff that might be
 271         required for netref resolution.
 272         """
 273         raise NotImplementedError
 274
 275     def do_configure(self):
 276         """After do_configure elements are configured"""
 277         raise NotImplementedError
 278
 279     def do_prestart(self):
 280         """Before do_start elements are prestart-configured"""
 281         raise NotImplementedError
 282
 283     def do_cross_connect_init(self, cross_data):
 284         """
 285         After do_cross_connect_init initiation of all external connections
 286         between different testbed elements is performed
 287         """
 288         raise NotImplementedError
 289
 290     def do_cross_connect_compl(self, cross_data):
 291         """
 292         After do_cross_connect_compl completion of all external connections
 293         between different testbed elements is performed
 294         """
 295         raise NotImplementedError
 296
 297     def start(self):
 298         raise NotImplementedError
 299
 300     def stop(self):
 301         raise NotImplementedError
 302
 303     def set(self, guid, name, value, time = TIME_NOW):
 304         raise NotImplementedError
 305
 306     def get(self, guid, name, time = TIME_NOW):
 307         raise NotImplementedError
 308
 309     def get_route(self, guid, index, attribute):
 310         """
 311         Params:
 312
 313             guid: guid of box to query
 314             index: number of routing entry to fetch
 315             attribute: one of Destination, NextHop, NetPrefix
 316         """
 317         raise NotImplementedError
 318
 319     def get_address(self, guid, index, attribute='Address'):
 320         """
 321         Params:
 322
 323             guid: guid of box to query
 324             index: number of inteface to select
 325             attribute: one of Address, NetPrefix, Broadcast
 326         """
 327         raise NotImplementedError
 328
 329     def get_attribute_list(self, guid):
 330         raise NotImplementedError
 331
 332     def get_tags(self, guid):
 333         raise NotImplementedError
 334
 335     def action(self, time, guid, action):
 336         raise NotImplementedError
 337
 338     def status(self, guid):
 339         raise NotImplementedError
 340
 341     def trace(self, guid, trace_id, attribute='value'):
 342         raise NotImplementedError
 343
 344     def shutdown(self):
 345         raise NotImplementedError
 346
 347 class ExperimentController(object):
 348     def __init__(self, experiment_xml, root_dir):
 349         self._experiment_xml = experiment_xml
 350         self._testbeds = dict()
 351         self._deployment_config = dict()
 352         self._netrefs = collections.defaultdict(set)
 353         self._testbed_netrefs = collections.defaultdict(set)
 354         self._cross_data = dict()
 355         self._root_dir = root_dir
 356         self._netreffed_testbeds = set()
 357         self._guids_in_testbed_cache = dict()
 358
 359         self.persist_experiment_xml()
 360
 361     @property
 362     def experiment_xml(self):
 363         return self._experiment_xml
 364
 365     @property
 366     def guids(self):
 367         guids = list()
 368         for testbed_guid in self._testbeds.keys():
 369             _guids = self._guids_in_testbed(testbed_guid)
 370             if _guids:
 371                 guids.extend(_guids)
 372         return guids
 373
 374     def persist_experiment_xml(self):
 375         xml_path = os.path.join(self._root_dir, "experiment.xml")
 376         f = open(xml_path, "w")
 377         f.write(self._experiment_xml)
 378         f.close()
 379
 380     def trace(self, guid, trace_id, attribute='value'):
 381         testbed = self._testbed_for_guid(guid)
 382         if testbed != None:
 383             return testbed.trace(guid, trace_id, attribute)
 384         raise RuntimeError("No element exists with guid %d" % guid)
 385
 386     @staticmethod
 387     def _parallel(callables):
 388         excs = []
 389         def wrap(callable):
 390             @functools.wraps(callable)
 391             def wrapped(*p, **kw):
 392                 try:
 393                     callable(*p, **kw)
 394                 except:
 395                     import traceback
 396                     traceback.print_exc(file=sys.stderr)
 397                     excs.append(sys.exc_info())
 398             return wrapped
 399         threads = [ threading.Thread(target=wrap(callable)) for callable in callables ]
 400         for thread in threads:
 401             thread.start()
 402         for thread in threads:
 403             thread.join()
 404         for exc in excs:
 405             eTyp, eVal, eLoc = exc
 406             raise eTyp, eVal, eLoc
 407
 408     def start(self):
 409         parser = XmlExperimentParser()
 410         data = parser.from_xml_to_data(self._experiment_xml)
 411
 412         self._init_testbed_controllers(data)
 413
 414         # persist testbed connection data, for potential recovery
 415         self._persist_testbed_proxies()
 416
 417         def steps_to_configure(self, allowed_guids):
 418             # perform setup in parallel for all test beds,
 419             # wait for all threads to finish
 420             self._parallel([testbed.do_setup
 421                             for guid,testbed in self._testbeds.iteritems()
 422                             if guid in allowed_guids])
 423
 424             # perform create-connect in parallel, wait
 425             # (internal connections only)
 426             self._parallel([testbed.do_create
 427                             for guid,testbed in self._testbeds.iteritems()
 428                             if guid in allowed_guids])
 429
 430             self._parallel([testbed.do_connect_init
 431                             for guid,testbed in self._testbeds.iteritems()
 432                             if guid in allowed_guids])
 433
 434             self._parallel([testbed.do_connect_compl
 435                             for guid,testbed in self._testbeds.iteritems()
 436                             if guid in allowed_guids])
 437
 438             self._parallel([testbed.do_preconfigure
 439                             for guid,testbed in self._testbeds.iteritems()
 440                             if guid in allowed_guids])
 441
 442         steps_to_configure(self, self._testbeds)
 443
 444         if self._netreffed_testbeds:
 445             # initally resolve netrefs
 446             self.do_netrefs(data, fail_if_undefined=False)
 447
 448             # rinse and repeat, for netreffed testbeds
 449             netreffed_testbeds = set(self._netreffed_testbeds)
 450
 451             self._init_testbed_controllers(data)
 452
 453             # persist testbed connection data, for potential recovery
 454             self._persist_testbed_proxies()
 455
 456             # configure dependant testbeds
 457             steps_to_configure(self, netreffed_testbeds)
 458
 459         # final netref step, fail if anything's left unresolved
 460         self.do_netrefs(data, fail_if_undefined=True)
 461
 462         self._program_testbed_cross_connections(data)
 463
 464         # perform do_configure in parallel for al testbeds
 465         # (it's internal configuration for each)
 466         self._parallel([testbed.do_configure
 467                         for testbed in self._testbeds.itervalues()])
 468
 469
 470         #print >>sys.stderr, "DO IT"
 471         #import time
 472         #time.sleep(60)
 473
 474         # cross-connect (cannot be done in parallel)
 475         for guid, testbed in self._testbeds.iteritems():
 476             cross_data = self._get_cross_data(guid)
 477             testbed.do_cross_connect_init(cross_data)
 478         for guid, testbed in self._testbeds.iteritems():
 479             cross_data = self._get_cross_data(guid)
 480             testbed.do_cross_connect_compl(cross_data)
 481
 482         # Last chance to configure (parallel on all testbeds)
 483         self._parallel([testbed.do_prestart
 484                         for testbed in self._testbeds.itervalues()])
 485
 486         # After this point no new elements will be craeted. Cleaning cache for safety.
 487         self._guids_in_testbed_cache = dict()
 488
 489         # start experiment (parallel start on all testbeds)
 490         self._parallel([testbed.start
 491                         for testbed in self._testbeds.itervalues()])
 492
 493     def _persist_testbed_proxies(self):
 494         TRANSIENT = ('Recover',)
 495
 496         # persist access configuration for all testbeds, so that
 497         # recovery mode can reconnect to them if it becomes necessary
 498         conf = ConfigParser.RawConfigParser()
 499         for testbed_guid, testbed_config in self._deployment_config.iteritems():
 500             testbed_guid = str(testbed_guid)
 501             conf.add_section(testbed_guid)
 502             for attr in testbed_config.attributes_list:
 503                 if attr not in TRANSIENT:
 504                     conf.set(testbed_guid, attr,
 505                         testbed_config.get_attribute_value(attr))
 506
 507         f = open(os.path.join(self._root_dir, 'deployment_config.ini'), 'w')
 508         conf.write(f)
 509         f.close()
 510
 511     def _load_testbed_proxies(self):
 512         TYPEMAP = {
 513             STRING : 'get',
 514             INTEGER : 'getint',
 515             FLOAT : 'getfloat',
 516             BOOLEAN : 'getboolean',
 517         }
 518
 519         # deferred import because proxy needs
 520         # our class definitions to define proxies
 521         import nepi.util.proxy as proxy
 522
 523         conf = ConfigParser.RawConfigParser()
 524         conf.read(os.path.join(self._root_dir, 'deployment_config.ini'))
 525         for testbed_guid in conf.sections():
 526             testbed_config = proxy.AccessConfiguration()
 527             for attr in conf.options(testbed_guid):
 528                 testbed_config.set_attribute_value(attr,
 529                     conf.get(testbed_guid, attr) )
 530
 531             testbed_guid = str(testbed_guid)
 532             conf.add_section(testbed_guid)
 533             for attr in testbed_config.attributes_list:
 534                 if attr not in TRANSIENT:
 535                     getter = getattr(conf, TYPEMAP.get(
 536                         testbed_config.get_attribute_type(attr),
 537                         'get') )
 538                     testbed_config.set_attribute_value(
 539                         testbed_guid, attr, getter(attr))
 540
 541     def _unpersist_testbed_proxies(self):
 542         try:
 543             os.remove(os.path.join(self._root_dir, 'deployment_config.ini'))
 544         except:
 545             # Just print exceptions, this is just cleanup
 546             import traceback
 547             traceback.print_exc(file=sys.stderr)
 548
 549     def stop(self):
 550        for testbed in self._testbeds.values():
 551            testbed.stop()
 552        self._unpersist_testbed_proxies()
 553
 554     def recover(self):
 555         # reload perviously persisted testbed access configurations
 556         self._load_testbed_proxies()
 557
 558         # recreate testbed proxies by reconnecting only
 559         self._init_testbed_controllers(recover = True)
 560
 561         # another time, for netrefs
 562         self._init_testbed_controllers(recover = True)
 563
 564     def is_finished(self, guid):
 565         testbed = self._testbed_for_guid(guid)
 566         if testbed != None:
 567             return testbed.status(guid) == STATUS_FINISHED
 568         raise RuntimeError("No element exists with guid %d" % guid)
 569
 570     def set(self, guid, name, value, time = TIME_NOW):
 571         testbed = self._testbed_for_guid(guid)
 572         if testbed != None:
 573             testbed.set(guid, name, value, time)
 574         raise RuntimeError("No element exists with guid %d" % guid)
 575
 576     def get(self, guid, name, time = TIME_NOW):
 577         testbed = self._testbed_for_guid(guid)
 578         if testbed != None:
 579             return testbed.get(guid, name, time)
 580         raise RuntimeError("No element exists with guid %d" % guid)
 581
 582     def get_tags(self, guid):
 583         testbed = self._testbed_for_guid(guid)
 584         if testbed != None:
 585             return testbed.get_tags(guid)
 586         raise RuntimeError("No element exists with guid %d" % guid)
 587
 588     def shutdown(self):
 589         for testbed in self._testbeds.values():
 590             testbed.shutdown()
 591
 592     def _testbed_for_guid(self, guid):
 593         for testbed_guid in self._testbeds.keys():
 594             if guid in self._guids_in_testbed(testbed_guid):
 595                 return self._testbeds[testbed_guid]
 596         return None
 597
 598     def _guids_in_testbed(self, testbed_guid):
 599         if testbed_guid not in self._testbeds:
 600             return set()
 601         if testbed_guid not in self._guids_in_testbed_cache:
 602             self._guids_in_testbed_cache[testbed_guid] = \
 603                 set(self._testbeds[testbed_guid].guids)
 604         return self._guids_in_testbed_cache[testbed_guid]
 605
 606     @staticmethod
 607     def _netref_component_split(component):
 608         match = COMPONENT_PATTERN.match(component)
 609         if match:
 610             return match.group("kind"), match.group("index")
 611         else:
 612             return component, None
 613
 614     _NETREF_COMPONENT_GETTERS = {
 615         'addr':
 616             lambda testbed, guid, index, name:
 617                 testbed.get_address(guid, int(index), name),
 618         'route' :
 619             lambda testbed, guid, index, name:
 620                 testbed.get_route(guid, int(index), name),
 621         'trace' :
 622             lambda testbed, guid, index, name:
 623                 testbed.trace(guid, index, name),
 624         '' :
 625             lambda testbed, guid, index, name:
 626                 testbed.get(guid, name),
 627     }
 628
 629     def resolve_netref_value(self, value, failval = None):
 630         match = ATTRIBUTE_PATTERN_BASE.search(value)
 631         if match:
 632             label = match.group("label")
 633             if label.startswith('GUID-'):
 634                 ref_guid = int(label[5:])
 635                 if ref_guid:
 636                     expr = match.group("expr")
 637                     component = (match.group("component") or "")[1:] # skip the dot
 638                     attribute = match.group("attribute")
 639
 640                     # split compound components into component kind and index
 641                     # eg: 'addr[0]' -> ('addr', '0')
 642                     component, component_index = self._netref_component_split(component)
 643
 644                     # find object and resolve expression
 645                     for ref_testbed_guid, ref_testbed in self._testbeds.iteritems():
 646                         if component not in self._NETREF_COMPONENT_GETTERS:
 647                             raise ValueError, "Malformed netref: %r - unknown component" % (expr,)
 648                         elif ref_guid not in self._guids_in_testbed(ref_testbed_guid):
 649                             pass
 650                         else:
 651                             ref_value = self._NETREF_COMPONENT_GETTERS[component](
 652                                 ref_testbed, ref_guid, component_index, attribute)
 653                             if ref_value:
 654                                 return value.replace(match.group(), ref_value)
 655         # couldn't find value
 656         return failval
 657
 658     def do_netrefs(self, data, fail_if_undefined = False):
 659         # element netrefs
 660         for (testbed_guid, guid), attrs in self._netrefs.items():
 661             testbed = self._testbeds.get(testbed_guid)
 662             if testbed is not None:
 663                 for name in set(attrs):
 664                     value = testbed.get(guid, name)
 665                     if isinstance(value, basestring):
 666                         ref_value = self.resolve_netref_value(value)
 667                         if ref_value is not None:
 668                             testbed.set(guid, name, ref_value)
 669                             attrs.remove(name)
 670                         elif fail_if_undefined:
 671                             raise ValueError, "Unresolvable netref in: %r=%r" % (name,value,)
 672                 if not attrs:
 673                     del self._netrefs[(testbed_guid, guid)]
 674
 675         # testbed netrefs
 676         for testbed_guid, attrs in self._testbed_netrefs.items():
 677             tb_data = dict(data.get_attribute_data(testbed_guid))
 678             if data:
 679                 for name in set(attrs):
 680                     value = tb_data.get(name)
 681                     if isinstance(value, basestring):
 682                         ref_value = self.resolve_netref_value(value)
 683                         if ref_value is not None:
 684                             data.set_attribute_data(testbed_guid, name, ref_value)
 685                             attrs.remove(name)
 686                         elif fail_if_undefined:
 687                             raise ValueError, "Unresolvable netref in: %r" % (value,)
 688                 if not attrs:
 689                     del self._testbed_netrefs[testbed_guid]
 690
 691
 692     def _init_testbed_controllers(self, data, recover = False):
 693         blacklist_testbeds = set(self._testbeds)
 694         element_guids = list()
 695         label_guids = dict()
 696         data_guids = data.guids
 697
 698         # create testbed controllers
 699         for guid in data_guids:
 700             if data.is_testbed_data(guid):
 701                 if guid not in self._testbeds:
 702                     self._create_testbed_controller(guid, data, element_guids,
 703                             recover)
 704             else:
 705                 (testbed_guid, factory_id) = data.get_box_data(guid)
 706                 if testbed_guid not in blacklist_testbeds:
 707                     element_guids.append(guid)
 708                     label = data.get_attribute_data(guid, "label")
 709                     if label is not None:
 710                         if label in label_guids:
 711                             raise RuntimeError, "Label %r is not unique" % (label,)
 712                         label_guids[label] = guid
 713
 714         # replace references to elements labels for its guid
 715         self._resolve_labels(data, data_guids, label_guids)
 716
 717         # program testbed controllers
 718         if not recover:
 719             self._program_testbed_controllers(element_guids, data)
 720
 721     def _resolve_labels(self, data, data_guids, label_guids):
 722         netrefs = self._netrefs
 723         testbed_netrefs = self._testbed_netrefs
 724         for guid in data_guids:
 725             for name, value in data.get_attribute_data(guid):
 726                 if isinstance(value, basestring):
 727                     match = ATTRIBUTE_PATTERN_BASE.search(value)
 728                     if match:
 729                         label = match.group("label")
 730                         if not label.startswith('GUID-'):
 731                             ref_guid = label_guids.get(label)
 732                             if ref_guid is not None:
 733                                 value = ATTRIBUTE_PATTERN_BASE.sub(
 734                                     ATTRIBUTE_PATTERN_GUID_SUB % dict(
 735                                         guid = 'GUID-%d' % (ref_guid,),
 736                                         expr = match.group("expr"),
 737                                         label = label),
 738                                     value)
 739                                 data.set_attribute_data(guid, name, value)
 740
 741                                 # memorize which guid-attribute pairs require
 742                                 # postprocessing, to avoid excessive controller-testbed
 743                                 # communication at configuration time
 744                                 # (which could require high-latency network I/O)
 745                                 if not data.is_testbed_data(guid):
 746                                     (testbed_guid, factory_id) = data.get_box_data(guid)
 747                                     netrefs[(testbed_guid, guid)].add(name)
 748                                 else:
 749                                     testbed_netrefs[guid].add(name)
 750
 751     def _create_testbed_controller(self, guid, data, element_guids, recover):
 752         (testbed_id, testbed_version) = data.get_testbed_data(guid)
 753         deployment_config = self._deployment_config.get(guid)
 754
 755         # deferred import because proxy needs
 756         # our class definitions to define proxies
 757         import nepi.util.proxy as proxy
 758
 759         if deployment_config is None:
 760             # need to create one
 761             deployment_config = proxy.AccessConfiguration()
 762
 763             for (name, value) in data.get_attribute_data(guid):
 764                 if value is not None and deployment_config.has_attribute(name):
 765                     # if any deployment config attribute has a netref, we can't
 766                     # create this controller yet
 767                     if isinstance(value, basestring) and ATTRIBUTE_PATTERN_BASE.search(value):
 768                         # remember to re-issue this one
 769                         self._netreffed_testbeds.add(guid)
 770                         return
 771
 772                     # copy deployment config attribute
 773                     deployment_config.set_attribute_value(name, value)
 774
 775             # commit config
 776             self._deployment_config[guid] = deployment_config
 777
 778         if deployment_config is not None:
 779             # force recovery mode
 780             deployment_config.set_attribute_value("recover",recover)
 781
 782         testbed = proxy.create_testbed_controller(testbed_id,
 783                 testbed_version, deployment_config)
 784         for (name, value) in data.get_attribute_data(guid):
 785             testbed.defer_configure(name, value)
 786         self._testbeds[guid] = testbed
 787         if guid in self._netreffed_testbeds:
 788             self._netreffed_testbeds.remove(guid)
 789
 790     def _program_testbed_controllers(self, element_guids, data):
 791         for guid in element_guids:
 792             (testbed_guid, factory_id) = data.get_box_data(guid)
 793             testbed = self._testbeds.get(testbed_guid)
 794             if testbed:
 795                 testbed.defer_create(guid, factory_id)
 796                 for (name, value) in data.get_attribute_data(guid):
 797                     # Try to resolve create-time netrefs, if possible
 798                     if isinstance(value, basestring) and ATTRIBUTE_PATTERN_BASE.search(value):
 799                         try:
 800                             nuvalue = self.resolve_netref_value(value)
 801                         except:
 802                             # Any trouble means we're not in shape to resolve the netref yet
 803                             nuvalue = None
 804                         if nuvalue is not None:
 805                             # Only if we succeed we remove the netref deferral entry
 806                             value = nuvalue
 807                             data.set_attribute_data(guid, name, value)
 808                             if (testbed_guid, guid) in self._netrefs:
 809                                 self._netrefs[(testbed_guid, guid)].discard(name)
 810                     testbed.defer_create_set(guid, name, value)
 811
 812         for guid in element_guids:
 813             (testbed_guid, factory_id) = data.get_box_data(guid)
 814             testbed = self._testbeds.get(testbed_guid)
 815             if testbed:
 816                 for (connector_type_name, cross_guid, cross_connector_type_name) \
 817                         in data.get_connection_data(guid):
 818                     (testbed_guid, factory_id) = data.get_box_data(guid)
 819                     (cross_testbed_guid, cross_factory_id) = data.get_box_data(
 820                             cross_guid)
 821                     if testbed_guid == cross_testbed_guid:
 822                         testbed.defer_connect(guid, connector_type_name,
 823                                 cross_guid, cross_connector_type_name)
 824                 for trace_id in data.get_trace_data(guid):
 825                     testbed.defer_add_trace(guid, trace_id)
 826                 for (autoconf, address, netprefix, broadcast) in \
 827                         data.get_address_data(guid):
 828                     if address != None:
 829                         testbed.defer_add_address(guid, address, netprefix,
 830                                 broadcast)
 831                 for (destination, netprefix, nexthop) in data.get_route_data(guid):
 832                     testbed.defer_add_route(guid, destination, netprefix, nexthop)
 833
 834     def _program_testbed_cross_connections(self, data):
 835         data_guids = data.guids
 836
 837         for guid in data_guids:
 838             if not data.is_testbed_data(guid):
 839                 (testbed_guid, factory_id) = data.get_box_data(guid)
 840                 testbed = self._testbeds.get(testbed_guid)
 841                 if testbed:
 842                     for (connector_type_name, cross_guid, cross_connector_type_name) \
 843                             in data.get_connection_data(guid):
 844                         (testbed_guid, factory_id) = data.get_box_data(guid)
 845                         (cross_testbed_guid, cross_factory_id) = data.get_box_data(
 846                                 cross_guid)
 847                         if testbed_guid != cross_testbed_guid:
 848                             cross_testbed = self._testbeds[cross_testbed_guid]
 849                             cross_testbed_id = cross_testbed.testbed_id
 850                             testbed.defer_cross_connect(guid, connector_type_name, cross_guid,
 851                                     cross_testbed_guid, cross_testbed_id, cross_factory_id,
 852                                     cross_connector_type_name)
 853                             # save cross data for later
 854                             self._add_crossdata(testbed_guid, guid, cross_testbed_guid,
 855                                     cross_guid)
 856
 857     def _add_crossdata(self, testbed_guid, guid, cross_testbed_guid, cross_guid):
 858         if testbed_guid not in self._cross_data:
 859             self._cross_data[testbed_guid] = dict()
 860         if cross_testbed_guid not in self._cross_data[testbed_guid]:
 861             self._cross_data[testbed_guid][cross_testbed_guid] = set()
 862         self._cross_data[testbed_guid][cross_testbed_guid].add(cross_guid)
 863
 864     def _get_cross_data(self, testbed_guid):
 865         cross_data = dict()
 866         if not testbed_guid in self._cross_data:
 867             return cross_data
 868         for cross_testbed_guid, guid_list in \
 869                 self._cross_data[testbed_guid].iteritems():
 870             cross_data[cross_testbed_guid] = dict()
 871             cross_testbed = self._testbeds[cross_testbed_guid]
 872             for cross_guid in guid_list:
 873                 elem_cross_data = dict(
 874                     _guid = cross_guid,
 875                     _testbed_guid = cross_testbed_guid,
 876                     _testbed_id = cross_testbed.testbed_id,
 877                     _testbed_version = cross_testbed.testbed_version)
 878                 cross_data[cross_testbed_guid][cross_guid] = elem_cross_data
 879                 attributes_list = cross_testbed.get_attribute_list(cross_guid)
 880                 for attr_name in attributes_list:
 881                     attr_value = cross_testbed.get(cross_guid, attr_name)
 882                     elem_cross_data[attr_name] = attr_value
 883         return cross_data
 884