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_factory_id(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             self._clear_caches()
 442
 443         steps_to_configure(self, self._testbeds)
 444
 445         if self._netreffed_testbeds:
 446             # initally resolve netrefs
 447             self.do_netrefs(data, fail_if_undefined=False)
 448
 449             # rinse and repeat, for netreffed testbeds
 450             netreffed_testbeds = set(self._netreffed_testbeds)
 451
 452             self._init_testbed_controllers(data)
 453
 454             # persist testbed connection data, for potential recovery
 455             self._persist_testbed_proxies()
 456
 457             # configure dependant testbeds
 458             steps_to_configure(self, netreffed_testbeds)
 459
 460         # final netref step, fail if anything's left unresolved
 461         self.do_netrefs(data, fail_if_undefined=True)
 462
 463         self._program_testbed_cross_connections(data)
 464
 465         # perform do_configure in parallel for al testbeds
 466         # (it's internal configuration for each)
 467         self._parallel([testbed.do_configure
 468                         for testbed in self._testbeds.itervalues()])
 469
 470         self._clear_caches()
 471
 472         #print >>sys.stderr, "DO IT"
 473         #import time
 474         #time.sleep(60)
 475
 476         # cross-connect (cannot be done in parallel)
 477         for guid, testbed in self._testbeds.iteritems():
 478             cross_data = self._get_cross_data(guid)
 479             testbed.do_cross_connect_init(cross_data)
 480         for guid, testbed in self._testbeds.iteritems():
 481             cross_data = self._get_cross_data(guid)
 482             testbed.do_cross_connect_compl(cross_data)
 483
 484         self._clear_caches()
 485
 486         # Last chance to configure (parallel on all testbeds)
 487         self._parallel([testbed.do_prestart
 488                         for testbed in self._testbeds.itervalues()])
 489
 490         self._clear_caches()
 491
 492         # start experiment (parallel start on all testbeds)
 493         self._parallel([testbed.start
 494                         for testbed in self._testbeds.itervalues()])
 495
 496         self._clear_caches()
 497
 498     def _clear_caches(self):
 499         # Cleaning cache for safety.
 500         self._guids_in_testbed_cache = dict()
 501
 502     def _persist_testbed_proxies(self):
 503         TRANSIENT = ('Recover',)
 504
 505         # persist access configuration for all testbeds, so that
 506         # recovery mode can reconnect to them if it becomes necessary
 507         conf = ConfigParser.RawConfigParser()
 508         for testbed_guid, testbed_config in self._deployment_config.iteritems():
 509             testbed_guid = str(testbed_guid)
 510             conf.add_section(testbed_guid)
 511             for attr in testbed_config.attributes_list:
 512                 if attr not in TRANSIENT:
 513                     conf.set(testbed_guid, attr,
 514                         testbed_config.get_attribute_value(attr))
 515
 516         f = open(os.path.join(self._root_dir, 'deployment_config.ini'), 'w')
 517         conf.write(f)
 518         f.close()
 519
 520     def _load_testbed_proxies(self):
 521         TYPEMAP = {
 522             STRING : 'get',
 523             INTEGER : 'getint',
 524             FLOAT : 'getfloat',
 525             BOOLEAN : 'getboolean',
 526         }
 527
 528         # deferred import because proxy needs
 529         # our class definitions to define proxies
 530         import nepi.util.proxy as proxy
 531
 532         conf = ConfigParser.RawConfigParser()
 533         conf.read(os.path.join(self._root_dir, 'deployment_config.ini'))
 534         for testbed_guid in conf.sections():
 535             testbed_config = proxy.AccessConfiguration()
 536             for attr in conf.options(testbed_guid):
 537                 testbed_config.set_attribute_value(attr,
 538                     conf.get(testbed_guid, attr) )
 539
 540             testbed_guid = str(testbed_guid)
 541             conf.add_section(testbed_guid)
 542             for attr in testbed_config.attributes_list:
 543                 if attr not in TRANSIENT:
 544                     getter = getattr(conf, TYPEMAP.get(
 545                         testbed_config.get_attribute_type(attr),
 546                         'get') )
 547                     testbed_config.set_attribute_value(
 548                         testbed_guid, attr, getter(attr))
 549
 550     def _unpersist_testbed_proxies(self):
 551         try:
 552             os.remove(os.path.join(self._root_dir, 'deployment_config.ini'))
 553         except:
 554             # Just print exceptions, this is just cleanup
 555             import traceback
 556             traceback.print_exc(file=sys.stderr)
 557
 558     def stop(self):
 559        for testbed in self._testbeds.values():
 560            testbed.stop()
 561        self._unpersist_testbed_proxies()
 562
 563     def recover(self):
 564         # reload perviously persisted testbed access configurations
 565         self._load_testbed_proxies()
 566
 567         # recreate testbed proxies by reconnecting only
 568         self._init_testbed_controllers(recover = True)
 569
 570         # another time, for netrefs
 571         self._init_testbed_controllers(recover = True)
 572
 573     def is_finished(self, guid):
 574         testbed = self._testbed_for_guid(guid)
 575         if testbed != None:
 576             return testbed.status(guid) == STATUS_FINISHED
 577         raise RuntimeError("No element exists with guid %d" % guid)
 578
 579     def set(self, guid, name, value, time = TIME_NOW):
 580         testbed = self._testbed_for_guid(guid)
 581         if testbed != None:
 582             testbed.set(guid, name, value, time)
 583         else:
 584             raise RuntimeError("No element exists with guid %d" % guid)
 585
 586     def get(self, guid, name, time = TIME_NOW):
 587         testbed = self._testbed_for_guid(guid)
 588         if testbed != None:
 589             return testbed.get(guid, name, time)
 590         raise RuntimeError("No element exists with guid %d" % guid)
 591
 592     def get_factory_id(self, guid):
 593         testbed = self._testbed_for_guid(guid)
 594         if testbed != None:
 595             return testbed.get_factory_id(guid)
 596         raise RuntimeError("No element exists with guid %d" % guid)
 597
 598     def get_testbed_id(self, guid):
 599         testbed = self._testbed_for_guid(guid)
 600         if testbed != None:
 601             return testbed.testbed_id
 602         raise RuntimeError("No element exists with guid %d" % guid)
 603
 604     def get_testbed_version(self, guid):
 605         testbed = self._testbed_for_guid(guid)
 606         if testbed != None:
 607             return testbed.testbed_version
 608         raise RuntimeError("No element exists with guid %d" % guid)
 609
 610     def shutdown(self):
 611         for testbed in self._testbeds.values():
 612             testbed.shutdown()
 613
 614     def _testbed_for_guid(self, guid):
 615         for testbed_guid in self._testbeds.keys():
 616             if guid in self._guids_in_testbed(testbed_guid):
 617                 return self._testbeds[testbed_guid]
 618         return None
 619
 620     def _guids_in_testbed(self, testbed_guid):
 621         if testbed_guid not in self._testbeds:
 622             return set()
 623         if testbed_guid not in self._guids_in_testbed_cache:
 624             self._guids_in_testbed_cache[testbed_guid] = \
 625                 set(self._testbeds[testbed_guid].guids)
 626         return self._guids_in_testbed_cache[testbed_guid]
 627
 628     @staticmethod
 629     def _netref_component_split(component):
 630         match = COMPONENT_PATTERN.match(component)
 631         if match:
 632             return match.group("kind"), match.group("index")
 633         else:
 634             return component, None
 635
 636     _NETREF_COMPONENT_GETTERS = {
 637         'addr':
 638             lambda testbed, guid, index, name:
 639                 testbed.get_address(guid, int(index), name),
 640         'route' :
 641             lambda testbed, guid, index, name:
 642                 testbed.get_route(guid, int(index), name),
 643         'trace' :
 644             lambda testbed, guid, index, name:
 645                 testbed.trace(guid, index, name),
 646         '' :
 647             lambda testbed, guid, index, name:
 648                 testbed.get(guid, name),
 649     }
 650
 651     def resolve_netref_value(self, value, failval = None):
 652         match = ATTRIBUTE_PATTERN_BASE.search(value)
 653         if match:
 654             label = match.group("label")
 655             if label.startswith('GUID-'):
 656                 ref_guid = int(label[5:])
 657                 if ref_guid:
 658                     expr = match.group("expr")
 659                     component = (match.group("component") or "")[1:] # skip the dot
 660                     attribute = match.group("attribute")
 661
 662                     # split compound components into component kind and index
 663                     # eg: 'addr[0]' -> ('addr', '0')
 664                     component, component_index = self._netref_component_split(component)
 665
 666                     # find object and resolve expression
 667                     for ref_testbed_guid, ref_testbed in self._testbeds.iteritems():
 668                         if component not in self._NETREF_COMPONENT_GETTERS:
 669                             raise ValueError, "Malformed netref: %r - unknown component" % (expr,)
 670                         elif ref_guid not in self._guids_in_testbed(ref_testbed_guid):
 671                             pass
 672                         else:
 673                             ref_value = self._NETREF_COMPONENT_GETTERS[component](
 674                                 ref_testbed, ref_guid, component_index, attribute)
 675                             if ref_value:
 676                                 return value.replace(match.group(), ref_value)
 677         # couldn't find value
 678         return failval
 679
 680     def do_netrefs(self, data, fail_if_undefined = False):
 681         # element netrefs
 682         for (testbed_guid, guid), attrs in self._netrefs.items():
 683             testbed = self._testbeds.get(testbed_guid)
 684             if testbed is not None:
 685                 for name in set(attrs):
 686                     value = testbed.get(guid, name)
 687                     if isinstance(value, basestring):
 688                         ref_value = self.resolve_netref_value(value)
 689                         if ref_value is not None:
 690                             testbed.set(guid, name, ref_value)
 691                             attrs.remove(name)
 692                         elif fail_if_undefined:
 693                             raise ValueError, "Unresolvable netref in: %r=%r" % (name,value,)
 694                 if not attrs:
 695                     del self._netrefs[(testbed_guid, guid)]
 696
 697         # testbed netrefs
 698         for testbed_guid, attrs in self._testbed_netrefs.items():
 699             tb_data = dict(data.get_attribute_data(testbed_guid))
 700             if data:
 701                 for name in set(attrs):
 702                     value = tb_data.get(name)
 703                     if isinstance(value, basestring):
 704                         ref_value = self.resolve_netref_value(value)
 705                         if ref_value is not None:
 706                             data.set_attribute_data(testbed_guid, name, ref_value)
 707                             attrs.remove(name)
 708                         elif fail_if_undefined:
 709                             raise ValueError, "Unresolvable netref in: %r" % (value,)
 710                 if not attrs:
 711                     del self._testbed_netrefs[testbed_guid]
 712
 713
 714     def _init_testbed_controllers(self, data, recover = False):
 715         blacklist_testbeds = set(self._testbeds)
 716         element_guids = list()
 717         label_guids = dict()
 718         data_guids = data.guids
 719
 720         # create testbed controllers
 721         for guid in data_guids:
 722             if data.is_testbed_data(guid):
 723                 if guid not in self._testbeds:
 724                     self._create_testbed_controller(guid, data, element_guids,
 725                             recover)
 726             else:
 727                 (testbed_guid, factory_id) = data.get_box_data(guid)
 728                 if testbed_guid not in blacklist_testbeds:
 729                     element_guids.append(guid)
 730                     label = data.get_attribute_data(guid, "label")
 731                     if label is not None:
 732                         if label in label_guids:
 733                             raise RuntimeError, "Label %r is not unique" % (label,)
 734                         label_guids[label] = guid
 735
 736         # replace references to elements labels for its guid
 737         self._resolve_labels(data, data_guids, label_guids)
 738
 739         # program testbed controllers
 740         if not recover:
 741             self._program_testbed_controllers(element_guids, data)
 742
 743     def _resolve_labels(self, data, data_guids, label_guids):
 744         netrefs = self._netrefs
 745         testbed_netrefs = self._testbed_netrefs
 746         for guid in data_guids:
 747             for name, value in data.get_attribute_data(guid):
 748                 if isinstance(value, basestring):
 749                     match = ATTRIBUTE_PATTERN_BASE.search(value)
 750                     if match:
 751                         label = match.group("label")
 752                         if not label.startswith('GUID-'):
 753                             ref_guid = label_guids.get(label)
 754                             if ref_guid is not None:
 755                                 value = ATTRIBUTE_PATTERN_BASE.sub(
 756                                     ATTRIBUTE_PATTERN_GUID_SUB % dict(
 757                                         guid = 'GUID-%d' % (ref_guid,),
 758                                         expr = match.group("expr"),
 759                                         label = label),
 760                                     value)
 761                                 data.set_attribute_data(guid, name, value)
 762
 763                                 # memorize which guid-attribute pairs require
 764                                 # postprocessing, to avoid excessive controller-testbed
 765                                 # communication at configuration time
 766                                 # (which could require high-latency network I/O)
 767                                 if not data.is_testbed_data(guid):
 768                                     (testbed_guid, factory_id) = data.get_box_data(guid)
 769                                     netrefs[(testbed_guid, guid)].add(name)
 770                                 else:
 771                                     testbed_netrefs[guid].add(name)
 772
 773     def _create_testbed_controller(self, guid, data, element_guids, recover):
 774         (testbed_id, testbed_version) = data.get_testbed_data(guid)
 775         deployment_config = self._deployment_config.get(guid)
 776
 777         # deferred import because proxy needs
 778         # our class definitions to define proxies
 779         import nepi.util.proxy as proxy
 780
 781         if deployment_config is None:
 782             # need to create one
 783             deployment_config = proxy.AccessConfiguration()
 784
 785             for (name, value) in data.get_attribute_data(guid):
 786                 if value is not None and deployment_config.has_attribute(name):
 787                     # if any deployment config attribute has a netref, we can't
 788                     # create this controller yet
 789                     if isinstance(value, basestring) and ATTRIBUTE_PATTERN_BASE.search(value):
 790                         # remember to re-issue this one
 791                         self._netreffed_testbeds.add(guid)
 792                         return
 793
 794                     # copy deployment config attribute
 795                     deployment_config.set_attribute_value(name, value)
 796
 797             # commit config
 798             self._deployment_config[guid] = deployment_config
 799
 800         if deployment_config is not None:
 801             # force recovery mode
 802             deployment_config.set_attribute_value("recover",recover)
 803
 804         testbed = proxy.create_testbed_controller(testbed_id,
 805                 testbed_version, deployment_config)
 806         for (name, value) in data.get_attribute_data(guid):
 807             testbed.defer_configure(name, value)
 808         self._testbeds[guid] = testbed
 809         if guid in self._netreffed_testbeds:
 810             self._netreffed_testbeds.remove(guid)
 811
 812     def _program_testbed_controllers(self, element_guids, data):
 813         for guid in element_guids:
 814             (testbed_guid, factory_id) = data.get_box_data(guid)
 815             testbed = self._testbeds.get(testbed_guid)
 816             if testbed:
 817                 testbed.defer_create(guid, factory_id)
 818                 for (name, value) in data.get_attribute_data(guid):
 819                     # Try to resolve create-time netrefs, if possible
 820                     if isinstance(value, basestring) and ATTRIBUTE_PATTERN_BASE.search(value):
 821                         try:
 822                             nuvalue = self.resolve_netref_value(value)
 823                         except:
 824                             # Any trouble means we're not in shape to resolve the netref yet
 825                             nuvalue = None
 826                         if nuvalue is not None:
 827                             # Only if we succeed we remove the netref deferral entry
 828                             value = nuvalue
 829                             data.set_attribute_data(guid, name, value)
 830                             if (testbed_guid, guid) in self._netrefs:
 831                                 self._netrefs[(testbed_guid, guid)].discard(name)
 832                     testbed.defer_create_set(guid, name, value)
 833
 834         for guid in element_guids:
 835             (testbed_guid, factory_id) = data.get_box_data(guid)
 836             testbed = self._testbeds.get(testbed_guid)
 837             if testbed:
 838                 for (connector_type_name, cross_guid, cross_connector_type_name) \
 839                         in data.get_connection_data(guid):
 840                     (testbed_guid, factory_id) = data.get_box_data(guid)
 841                     (cross_testbed_guid, cross_factory_id) = data.get_box_data(
 842                             cross_guid)
 843                     if testbed_guid == cross_testbed_guid:
 844                         testbed.defer_connect(guid, connector_type_name,
 845                                 cross_guid, cross_connector_type_name)
 846                 for trace_id in data.get_trace_data(guid):
 847                     testbed.defer_add_trace(guid, trace_id)
 848                 for (autoconf, address, netprefix, broadcast) in \
 849                         data.get_address_data(guid):
 850                     if address != None:
 851                         testbed.defer_add_address(guid, address, netprefix,
 852                                 broadcast)
 853                 for (destination, netprefix, nexthop) in data.get_route_data(guid):
 854                     testbed.defer_add_route(guid, destination, netprefix, nexthop)
 855
 856     def _program_testbed_cross_connections(self, data):
 857         data_guids = data.guids
 858
 859         for guid in data_guids:
 860             if not data.is_testbed_data(guid):
 861                 (testbed_guid, factory_id) = data.get_box_data(guid)
 862                 testbed = self._testbeds.get(testbed_guid)
 863                 if testbed:
 864                     for (connector_type_name, cross_guid, cross_connector_type_name) \
 865                             in data.get_connection_data(guid):
 866                         (testbed_guid, factory_id) = data.get_box_data(guid)
 867                         (cross_testbed_guid, cross_factory_id) = data.get_box_data(
 868                                 cross_guid)
 869                         if testbed_guid != cross_testbed_guid:
 870                             cross_testbed = self._testbeds[cross_testbed_guid]
 871                             cross_testbed_id = cross_testbed.testbed_id
 872                             testbed.defer_cross_connect(guid, connector_type_name, cross_guid,
 873                                     cross_testbed_guid, cross_testbed_id, cross_factory_id,
 874                                     cross_connector_type_name)
 875                             # save cross data for later
 876                             self._add_crossdata(testbed_guid, guid, cross_testbed_guid,
 877                                     cross_guid)
 878
 879     def _add_crossdata(self, testbed_guid, guid, cross_testbed_guid, cross_guid):
 880         if testbed_guid not in self._cross_data:
 881             self._cross_data[testbed_guid] = dict()
 882         if cross_testbed_guid not in self._cross_data[testbed_guid]:
 883             self._cross_data[testbed_guid][cross_testbed_guid] = set()
 884         self._cross_data[testbed_guid][cross_testbed_guid].add(cross_guid)
 885
 886     def _get_cross_data(self, testbed_guid):
 887         cross_data = dict()
 888         if not testbed_guid in self._cross_data:
 889             return cross_data
 890         for cross_testbed_guid, guid_list in \
 891                 self._cross_data[testbed_guid].iteritems():
 892             cross_data[cross_testbed_guid] = dict()
 893             cross_testbed = self._testbeds[cross_testbed_guid]
 894             for cross_guid in guid_list:
 895                 elem_cross_data = dict(
 896                     _guid = cross_guid,
 897                     _testbed_guid = cross_testbed_guid,
 898                     _testbed_id = cross_testbed.testbed_id,
 899                     _testbed_version = cross_testbed.testbed_version)
 900                 cross_data[cross_testbed_guid][cross_guid] = elem_cross_data
 901                 attributes_list = cross_testbed.get_attribute_list(cross_guid)
 902                 for attr_name in attributes_list:
 903                     attr_value = cross_testbed.get(cross_guid, attr_name)
 904                     elem_cross_data[attr_name] = attr_value
 905         return cross_data
 906