src/nepi/core/testbed_impl.py

   1 #!/usr/bin/env python
   2 # -*- coding: utf-8 -*-
   3
   4 from nepi.core import execute
   5 from nepi.core.metadata import Metadata, Parallel
   6 from nepi.util import validation
   7 from nepi.util.constants import TIME_NOW, \
   8         ApplicationStatus as AS, \
   9         TestbedStatus as TS, \
  10         CONNECTION_DELAY
  11 from nepi.util.parallel import ParallelRun
  12
  13 import collections
  14 import copy
  15 import logging
  16
  17 class TestbedController(execute.TestbedController):
  18     def __init__(self, testbed_id, testbed_version):
  19         super(TestbedController, self).__init__(testbed_id, testbed_version)
  20         self._status = TS.STATUS_ZERO
  21         # testbed attributes for validation
  22         self._attributes = None
  23         # element factories for validation
  24         self._factories = dict()
  25
  26         # experiment construction instructions
  27         self._create = dict()
  28         self._create_set = dict()
  29         self._factory_set = dict()
  30         self._connect = dict()
  31         self._cross_connect = dict()
  32         self._add_trace = dict()
  33         self._add_address = dict()
  34         self._add_route = dict()
  35         self._configure = dict()
  36
  37         # log of set operations
  38         self._setlog = dict()
  39         # last set operations
  40         self._set = dict()
  41
  42         # testbed element instances
  43         self._elements = dict()
  44
  45         self._metadata = Metadata(self._testbed_id)
  46         if self._metadata.testbed_version != testbed_version:
  47             raise RuntimeError("Bad testbed version on testbed %s. Asked for %s, got %s" % \
  48                     (testbed_id, testbed_version, self._metadata.testbed_version))
  49         for factory in self._metadata.build_factories():
  50             self._factories[factory.factory_id] = factory
  51         self._attributes = self._metadata.testbed_attributes()
  52         self._root_directory = None
  53
  54         # Logging
  55         self._logger = logging.getLogger("nepi.core.testbed_impl")
  56
  57     @property
  58     def root_directory(self):
  59         return self._root_directory
  60
  61     @property
  62     def guids(self):
  63         return self._create.keys()
  64
  65     @property
  66     def elements(self):
  67         return self._elements
  68
  69     def defer_configure(self, name, value):
  70         self._validate_testbed_attribute(name)
  71         self._validate_testbed_value(name, value)
  72         self._attributes.set_attribute_value(name, value)
  73         self._configure[name] = value
  74
  75     def defer_create(self, guid, factory_id):
  76         self._validate_factory_id(factory_id)
  77         self._validate_not_guid(guid)
  78         self._create[guid] = factory_id
  79
  80     def defer_create_set(self, guid, name, value):
  81         self._validate_guid(guid)
  82         self._validate_box_attribute(guid, name)
  83         self._validate_box_value(guid, name, value)
  84         if guid not in self._create_set:
  85             self._create_set[guid] = dict()
  86         self._create_set[guid][name] = value
  87
  88     def defer_factory_set(self, guid, name, value):
  89         self._validate_guid(guid)
  90         self._validate_factory_attribute(guid, name)
  91         self._validate_factory_value(guid, name, value)
  92         if guid not in self._factory_set:
  93             self._factory_set[guid] = dict()
  94         self._factory_set[guid][name] = value
  95
  96     def defer_connect(self, guid1, connector_type_name1, guid2,
  97             connector_type_name2):
  98         self._validate_guid(guid1)
  99         self._validate_guid(guid2)
 100         factory1 = self._get_factory(guid1)
 101         factory_id2 = self._create[guid2]
 102         connector_type = factory1.connector_type(connector_type_name1)
 103         connector_type.can_connect(self._testbed_id, factory_id2,
 104                 connector_type_name2, False)
 105         self._validate_connection(guid1, connector_type_name1, guid2,
 106             connector_type_name2)
 107
 108         if not guid1 in self._connect:
 109             self._connect[guid1] = dict()
 110         if not connector_type_name1 in self._connect[guid1]:
 111              self._connect[guid1][connector_type_name1] = dict()
 112         self._connect[guid1][connector_type_name1][guid2] = \
 113                connector_type_name2
 114         if not guid2 in self._connect:
 115             self._connect[guid2] = dict()
 116         if not connector_type_name2 in self._connect[guid2]:
 117              self._connect[guid2][connector_type_name2] = dict()
 118         self._connect[guid2][connector_type_name2][guid1] = \
 119                connector_type_name1
 120
 121     def defer_cross_connect(self, guid, connector_type_name, cross_guid,
 122             cross_testbed_guid, cross_testbed_id, cross_factory_id,
 123             cross_connector_type_name):
 124         self._validate_guid(guid)
 125         factory = self._get_factory(guid)
 126         connector_type = factory.connector_type(connector_type_name)
 127         connector_type.can_connect(cross_testbed_id, cross_factory_id,
 128                 cross_connector_type_name, True)
 129         self._validate_connection(guid, connector_type_name, cross_guid,
 130             cross_connector_type_name)
 131
 132         if not guid in self._cross_connect:
 133             self._cross_connect[guid] = dict()
 134         if not connector_type_name in self._cross_connect[guid]:
 135              self._cross_connect[guid][connector_type_name] = dict()
 136         self._cross_connect[guid][connector_type_name] = \
 137                 (cross_guid, cross_testbed_guid, cross_testbed_id,
 138                 cross_factory_id, cross_connector_type_name)
 139
 140     def defer_add_trace(self, guid, trace_name):
 141         self._validate_guid(guid)
 142         self._validate_trace(guid, trace_name)
 143         if not guid in self._add_trace:
 144             self._add_trace[guid] = list()
 145         self._add_trace[guid].append(trace_name)
 146
 147     def defer_add_address(self, guid, address, netprefix, broadcast):
 148         self._validate_guid(guid)
 149         self._validate_allow_addresses(guid)
 150         if guid not in self._add_address:
 151             self._add_address[guid] = list()
 152         self._add_address[guid].append((address, netprefix, broadcast))
 153
 154     def defer_add_route(self, guid, destination, netprefix, nexthop, metric = 0):
 155         self._validate_guid(guid)
 156         self._validate_allow_routes(guid)
 157         if not guid in self._add_route:
 158             self._add_route[guid] = list()
 159         self._add_route[guid].append((destination, netprefix, nexthop, metric))
 160
 161     def do_setup(self):
 162         self._root_directory = self._attributes.\
 163             get_attribute_value("rootDirectory")
 164         self._status = TS.STATUS_SETUP
 165
 166     def do_create(self):
 167         def set_params(self, guid):
 168             parameters = self._get_parameters(guid)
 169             for name, value in parameters.iteritems():
 170                 self.set(guid, name, value)
 171
 172         self._do_in_factory_order(
 173             'create_function',
 174             self._metadata.create_order,
 175             postaction = set_params )
 176         self._status = TS.STATUS_CREATED
 177
 178     def _do_connect(self, init = True):
 179         unconnected = copy.deepcopy(self._connect)
 180
 181         while unconnected:
 182             for guid1, connections in unconnected.items():
 183                 factory1 = self._get_factory(guid1)
 184                 for connector_type_name1, connections2 in connections.items():
 185                     connector_type1 = factory1.connector_type(connector_type_name1)
 186                     for guid2, connector_type_name2 in connections2.items():
 187                         factory_id2 = self._create[guid2]
 188                         # Connections are executed in a "From -> To" direction only
 189                         # This explicitly ignores the "To -> From" (mirror)
 190                         # connections of every connection pair.
 191                         if init:
 192                             connect_code = connector_type1.connect_to_init_code(
 193                                     self._testbed_id, factory_id2,
 194                                     connector_type_name2,
 195                                     False)
 196                         else:
 197                             connect_code = connector_type1.connect_to_compl_code(
 198                                     self._testbed_id, factory_id2,
 199                                     connector_type_name2,
 200                                     False)
 201                         delay = None
 202                         if connect_code:
 203                             delay = connect_code(self, guid1, guid2)
 204
 205                         if delay is not CONNECTION_DELAY:
 206                             del unconnected[guid1][connector_type_name1][guid2]
 207                     if not unconnected[guid1][connector_type_name1]:
 208                         del unconnected[guid1][connector_type_name1]
 209                 if not unconnected[guid1]:
 210                     del unconnected[guid1]
 211
 212     def do_connect_init(self):
 213         self._do_connect()
 214
 215     def do_connect_compl(self):
 216         self._do_connect(init = False)
 217         self._status = TS.STATUS_CONNECTED
 218
 219     def _do_in_factory_order(self, action, order, postaction = None, poststep = None):
 220         logger = self._logger
 221
 222         guids = collections.defaultdict(list)
 223         # order guids (elements) according to factory_id
 224         for guid, factory_id in self._create.iteritems():
 225             guids[factory_id].append(guid)
 226
 227         # configure elements following the factory_id order
 228         for factory_id in order:
 229             # Create a parallel runner if we're given a Parallel() wrapper
 230             runner = None
 231             if isinstance(factory_id, Parallel):
 232                 runner = ParallelRun(factory_id.maxthreads)
 233                 factory_id = factory_id.factory
 234
 235             # omit the factories that have no element to create
 236             if factory_id not in guids:
 237                 continue
 238
 239             # configure action
 240             factory = self._factories[factory_id]
 241             if isinstance(action, basestring) and not getattr(factory, action):
 242                 continue
 243             def perform_action(guid):
 244                 if isinstance(action, basestring):
 245                     getattr(factory, action)(self, guid)
 246                 else:
 247                     action(self, guid)
 248                 if postaction:
 249                     postaction(self, guid)
 250
 251             # perform the action on all elements, in parallel if so requested
 252             if runner:
 253                 logger.debug("TesbedController: Starting parallel %s", action)
 254                 runner.start()
 255
 256             for guid in guids[factory_id]:
 257                 if runner:
 258                     logger.debug("TestbedController: Scheduling %s on %s", action, guid)
 259                     runner.put(perform_action, guid)
 260                 else:
 261                     logger.debug("TestbedController: Performing %s on %s", action, guid)
 262                     perform_action(guid)
 263
 264             # sync
 265             if runner:
 266                 runner.sync()
 267
 268             # post hook
 269             if poststep:
 270                 for guid in guids[factory_id]:
 271                     if runner:
 272                         logger.debug("TestbedController: Scheduling post-%s on %s", action, guid)
 273                         runner.put(poststep, self, guid)
 274                     else:
 275                         logger.debug("TestbedController: Performing post-%s on %s", action, guid)
 276                         poststep(self, guid)
 277
 278             # sync
 279             if runner:
 280                 runner.join()
 281                 logger.debug("TestbedController: Finished parallel %s", action)
 282
 283     @staticmethod
 284     def do_poststep_preconfigure(self, guid):
 285         # dummy hook for implementations interested in
 286         # two-phase configuration
 287         pass
 288
 289     def do_preconfigure(self):
 290         self._do_in_factory_order(
 291             'preconfigure_function',
 292             self._metadata.preconfigure_order,
 293             poststep = self.do_poststep_preconfigure )
 294
 295     @staticmethod
 296     def do_poststep_configure(self, guid):
 297         # dummy hook for implementations interested in
 298         # two-phase configuration
 299         pass
 300
 301     def do_configure(self):
 302         self._do_in_factory_order(
 303             'configure_function',
 304             self._metadata.configure_order,
 305             poststep = self.do_poststep_configure )
 306         self._status = TS.STATUS_CONFIGURED
 307
 308     def do_prestart(self):
 309         self._do_in_factory_order(
 310             'prestart_function',
 311             self._metadata.prestart_order )
 312
 313     def _do_cross_connect(self, cross_data, init = True):
 314         for guid, cross_connections in self._cross_connect.iteritems():
 315             factory = self._get_factory(guid)
 316             for connector_type_name, cross_connection in \
 317                     cross_connections.iteritems():
 318                 connector_type = factory.connector_type(connector_type_name)
 319                 (cross_guid, cross_testbed_guid, cross_testbed_id,
 320                     cross_factory_id, cross_connector_type_name) = cross_connection
 321                 if init:
 322                     connect_code = connector_type.connect_to_init_code(
 323                         cross_testbed_id, cross_factory_id,
 324                         cross_connector_type_name,
 325                         True)
 326                 else:
 327                     connect_code = connector_type.connect_to_compl_code(
 328                         cross_testbed_id, cross_factory_id,
 329                         cross_connector_type_name,
 330                         True)
 331                 if connect_code:
 332                     self._logger.debug("Cross-connect: guid: %d, connect_code: %s " % (
 333                         guid, repr(connect_code)))
 334                     elem_cross_data = cross_data[cross_testbed_guid][cross_guid]
 335                     connect_code(self, guid, elem_cross_data)
 336
 337     def do_cross_connect_init(self, cross_data):
 338         self._do_cross_connect(cross_data)
 339
 340     def do_cross_connect_compl(self, cross_data):
 341         self._do_cross_connect(cross_data, init = False)
 342         self._status = TS.STATUS_CROSS_CONNECTED
 343
 344     def set(self, guid, name, value, time = TIME_NOW):
 345         self._validate_guid(guid)
 346         self._validate_box_attribute(guid, name)
 347         self._validate_box_value(guid, name, value)
 348         self._validate_modify_box_value(guid, name)
 349         if guid not in self._set:
 350             self._set[guid] = dict()
 351             self._setlog[guid] = dict()
 352         if time not in self._setlog[guid]:
 353             self._setlog[guid][time] = dict()
 354         self._setlog[guid][time][name] = value
 355         self._set[guid][name] = value
 356
 357     def get(self, guid, name, time = TIME_NOW):
 358         """
 359         gets an attribute from box definitions if available.
 360         Throws KeyError if the GUID wasn't created
 361         through the defer_create interface, and AttributeError if the
 362         attribute isn't available (doesn't exist or is design-only)
 363         """
 364         self._validate_guid(guid)
 365         self._validate_box_attribute(guid, name)
 366         if guid in self._set and name in self._set[guid]:
 367             return self._set[guid][name]
 368         if guid in self._create_set and name in self._create_set[guid]:
 369             return self._create_set[guid][name]
 370         # if nothing else found, returns the factory default value
 371         factory = self._get_factory(guid)
 372         return factory.box_attributes.get_attribute_value(name)
 373
 374     def get_route(self, guid, index, attribute):
 375         """
 376         returns information given to defer_add_route.
 377
 378         Raises AttributeError if an invalid attribute is requested
 379             or if the indexed routing rule does not exist.
 380
 381         Raises KeyError if the GUID has not been seen by
 382             defer_add_route
 383         """
 384         ATTRIBUTES = ['Destination', 'NetPrefix', 'NextHop']
 385
 386         if attribute not in ATTRIBUTES:
 387             raise AttributeError, "Attribute %r invalid for addresses of %r" % (attribute, guid)
 388
 389         attribute_index = ATTRIBUTES.index(attribute)
 390
 391         routes = self._add_route.get(guid)
 392         if not routes:
 393             raise KeyError, "GUID %r not found in %s" % (guid, self._testbed_id)
 394
 395         index = int(index)
 396         if not (0 <= index < len(addresses)):
 397             raise AttributeError, "GUID %r at %s does not have a routing entry #%s" % (
 398                 guid, self._testbed_id, index)
 399
 400         return routes[index][attribute_index]
 401
 402     def get_address(self, guid, index, attribute='Address'):
 403         """
 404         returns information given to defer_add_address
 405
 406         Raises AttributeError if an invalid attribute is requested
 407             or if the indexed routing rule does not exist.
 408
 409         Raises KeyError if the GUID has not been seen by
 410             defer_add_address
 411         """
 412         ATTRIBUTES = ['Address', 'NetPrefix', 'Broadcast']
 413
 414         if attribute not in ATTRIBUTES:
 415             raise AttributeError, "Attribute %r invalid for addresses of %r" % (attribute, guid)
 416
 417         attribute_index = ATTRIBUTES.index(attribute)
 418
 419         addresses = self._add_address.get(guid)
 420         if not addresses:
 421             raise KeyError, "GUID %r not found in %s" % (guid, self._testbed_id)
 422
 423         index = int(index)
 424         if not (0 <= index < len(addresses)):
 425             raise AttributeError, "GUID %r at %s does not have an address #%s" % (
 426                 guid, self._testbed_id, index)
 427
 428         return addresses[index][attribute_index]
 429
 430     def get_attribute_list(self, guid, filter_flags = None, exclude = False):
 431         factory = self._get_factory(guid)
 432         attribute_list = list()
 433         return factory.box_attributes.get_attribute_list(filter_flags, exclude)
 434
 435     def get_factory_id(self, guid):
 436         factory = self._get_factory(guid)
 437         return factory.factory_id
 438
 439     def start(self, time = TIME_NOW):
 440         self._do_in_factory_order(
 441             'start_function',
 442             self._metadata.start_order )
 443         self._status = TS.STATUS_STARTED
 444
 445     #action: NotImplementedError
 446
 447     def stop(self, time = TIME_NOW):
 448         self._do_in_factory_order(
 449             'stop_function',
 450             reversed(self._metadata.start_order) )
 451         self._status = TS.STATUS_STOPPED
 452
 453     def status(self, guid = None):
 454         if not guid:
 455             return self._status
 456         self._validate_guid(guid)
 457         factory = self._get_factory(guid)
 458         status_function = factory.status_function
 459         if status_function:
 460             return status_function(self, guid)
 461         return AS.STATUS_UNDETERMINED
 462
 463     def testbed_status(self):
 464         return self._status
 465
 466     def trace(self, guid, trace_id, attribute='value'):
 467         if attribute == 'value':
 468             fd = open("%s" % self.trace_filepath(guid, trace_id), "r")
 469             content = fd.read()
 470             fd.close()
 471         elif attribute == 'path':
 472             content = self.trace_filepath(guid, trace_id)
 473         elif attribute == 'filename':
 474             content = self.trace_filename(guid, trace_id)
 475         else:
 476             content = None
 477         return content
 478
 479     def traces_info(self):
 480         traces_info = dict()
 481         host = self._attributes.get_attribute_value("deployment_host")
 482         user = self._attributes.get_attribute_value("deployment_user")
 483         for guid, trace_list in self._add_trace.iteritems():
 484             traces_info[guid] = dict()
 485             for trace_id in trace_list:
 486                 traces_info[guid][trace_id] = dict()
 487                 filepath = self.trace(guid, trace_id, attribute = "path")
 488                 traces_info[guid][trace_id]["host"] = host
 489                 traces_info[guid][trace_id]["user"] = user
 490                 traces_info[guid][trace_id]["filepath"] = filepath
 491         return traces_info
 492
 493     def trace_filepath(self, guid, trace_id):
 494         """
 495         Return a trace's file path, for TestbedController's default
 496         implementation of trace()
 497         """
 498         raise NotImplementedError
 499
 500     def trace_filename(self, guid, trace_id):
 501         """
 502         Return a trace's file name, for TestbedController's default
 503         implementation of trace()
 504         """
 505         raise NotImplementedError
 506
 507     #shutdown: NotImplementedError
 508
 509     def get_connected(self, guid, connector_type_name,
 510             other_connector_type_name):
 511         """searchs the connected elements for the specific connector_type_name
 512         pair"""
 513         if guid not in self._connect:
 514             return []
 515         # all connections for all connectors for guid
 516         all_connections = self._connect[guid]
 517         if connector_type_name not in all_connections:
 518             return []
 519         # all connections for the specific connector
 520         connections = all_connections[connector_type_name]
 521         specific_connections = [otr_guid for otr_guid, otr_connector_type_name \
 522                 in connections.iteritems() if \
 523                 otr_connector_type_name == other_connector_type_name]
 524         return specific_connections
 525
 526     def _get_connection_count(self, guid, connection_type_name):
 527         count = 0
 528         cross_count = 0
 529         if guid in self._connect and connection_type_name in \
 530                 self._connect[guid]:
 531             count = len(self._connect[guid][connection_type_name])
 532         if guid in self._cross_connect and connection_type_name in \
 533                 self._cross_connect[guid]:
 534             cross_count = len(self._cross_connect[guid][connection_type_name])
 535         return count + cross_count
 536
 537     def _get_traces(self, guid):
 538         return [] if guid not in self._add_trace else self._add_trace[guid]
 539
 540     def _get_parameters(self, guid):
 541         return dict() if guid not in self._create_set else \
 542                 self._create_set[guid]
 543
 544     def _get_factory(self, guid):
 545         factory_id = self._create[guid]
 546         return self._factories[factory_id]
 547
 548     def _get_factory_id(self, guid):
 549         """ Returns the factory ID of the (perhaps not yet) created object """
 550         return self._create.get(guid, None)
 551
 552     def _validate_guid(self, guid):
 553         if not guid in self._create:
 554             raise RuntimeError("Element guid %d doesn't exist" % guid)
 555
 556     def _validate_not_guid(self, guid):
 557         if guid in self._create:
 558             raise AttributeError("Cannot add elements with the same guid: %d" %
 559                     guid)
 560
 561     def _validate_factory_id(self, factory_id):
 562         if factory_id not in self._factories:
 563             raise AttributeError("Invalid element type %s for testbed version %s" %
 564                     (factory_id, self._testbed_version))
 565
 566     def _validate_testbed_attribute(self, name):
 567         if not self._attributes.has_attribute(name):
 568             raise AttributeError("Invalid testbed attribute %s for testbed" % \
 569                     name)
 570
 571     def _validate_testbed_value(self, name, value):
 572         if not self._attributes.is_attribute_value_valid(name, value):
 573             raise AttributeError("Invalid value %r for testbed attribute %s" % \
 574                 (value, name))
 575
 576     def _validate_box_attribute(self, guid, name):
 577         factory = self._get_factory(guid)
 578         if not factory.box_attributes.has_attribute(name):
 579             raise AttributeError("Invalid attribute %s for element type %s" %
 580                     (name, factory.factory_id))
 581
 582     def _validate_box_value(self, guid, name, value):
 583         factory = self._get_factory(guid)
 584         if not factory.box_attributes.is_attribute_value_valid(name, value):
 585             raise AttributeError("Invalid value %r for attribute %s" % \
 586                 (value, name))
 587
 588     def _validate_factory_attribute(self, guid, name):
 589         factory = self._get_factory(guid)
 590         if not factory.has_attribute(name):
 591             raise AttributeError("Invalid attribute %s for element type %s" %
 592                     (name, factory.factory_id))
 593
 594     def _validate_factory_value(self, guid, name, value):
 595         factory = self._get_factory(guid)
 596         if not factory.is_attribute_value_valid(name, value):
 597             raise AttributeError("Invalid value %r for attribute %s" % \
 598                 (value, name))
 599
 600     def _validate_trace(self, guid, trace_name):
 601         factory = self._get_factory(guid)
 602         if not trace_name in factory.traces_list:
 603             raise RuntimeError("Element type '%s' has no trace '%s'" %
 604                     (factory.factory_id, trace_name))
 605
 606     def _validate_allow_addresses(self, guid):
 607         factory = self._get_factory(guid)
 608         if not factory.allow_addresses:
 609             raise RuntimeError("Element type '%s' doesn't support addresses" %
 610                     factory.factory_id)
 611         attr_name = "maxAddresses"
 612         if guid in self._create_set and attr_name in self._create_set[guid]:
 613             max_addresses = self._create_set[guid][attr_name]
 614         else:
 615             factory = self._get_factory(guid)
 616             max_addresses = factory.box_attributes.get_attribute_value(attr_name)
 617         if guid in self._add_address:
 618             count_addresses = len(self._add_address[guid])
 619             if max_addresses == count_addresses:
 620                 raise RuntimeError("Element guid %d of type '%s' can't accept \
 621                         more addresses" % (guid, factory.factory_id))
 622
 623     def _validate_allow_routes(self, guid):
 624         factory = self._get_factory(guid)
 625         if not factory.allow_routes:
 626             raise RuntimeError("Element type '%s' doesn't support routes" %
 627                     factory.factory_id)
 628
 629     def _validate_connection(self, guid1, connector_type_name1, guid2,
 630             connector_type_name2, cross = False):
 631         # can't connect with self
 632         if guid1 == guid2:
 633             raise AttributeError("Can't connect guid %d to self" % \
 634                 (guid1))
 635         # the connection is already done, so ignore
 636         connected = self.get_connected(guid1, connector_type_name1,
 637                 connector_type_name2)
 638         if guid2 in connected:
 639             return
 640         count1 = self._get_connection_count(guid1, connector_type_name1)
 641         factory1 = self._get_factory(guid1)
 642         connector_type1 = factory1.connector_type(connector_type_name1)
 643         if count1 == connector_type1.max:
 644             raise AttributeError("Connector %s is full for guid %d" % \
 645                 (connector_type_name1, guid1))
 646
 647     def _validate_modify_box_value(self, guid, name):
 648         factory = self._get_factory(guid)
 649         if self._status > TS.STATUS_STARTED and \
 650                 (factory.box_attributes.is_attribute_exec_read_only(name) or \
 651                 factory.box_attributes.is_attribute_exec_immutable(name)):
 652             raise AttributeError("Attribute %s can only be modified during experiment design" % name)
 653