src/allmydata/test/test_checker.py

   1
   2 import simplejson
   3 import os.path, shutil
   4 from twisted.trial import unittest
   5 from twisted.internet import defer
   6 from allmydata import check_results, uri
   7 from allmydata import uri as tahoe_uri
   8 from allmydata.util import base32
   9 from allmydata.web import check_results as web_check_results
  10 from allmydata.storage_client import StorageFarmBroker, NativeStorageServer
  11 from allmydata.storage.server import storage_index_to_dir
  12 from allmydata.monitor import Monitor
  13 from allmydata.test.no_network import GridTestMixin
  14 from allmydata.immutable.upload import Data
  15 from allmydata.test.common_web import WebRenderingMixin
  16 from allmydata.mutable.publish import MutableData
  17
  18 class FakeClient:
  19     def get_storage_broker(self):
  20         return self.storage_broker
  21
  22 class WebResultsRendering(unittest.TestCase, WebRenderingMixin):
  23
  24     def create_fake_client(self):
  25         sb = StorageFarmBroker(None, True)
  26         # s.get_name() (the "short description") will be "v0-00000000".
  27         # s.get_longname() will include the -long suffix.
  28         # s.get_peerid() (i.e. tubid) will be "aaa.." or "777.." or "ceir.."
  29         servers = [("v0-00000000-long", "\x00"*20, "peer-0"),
  30                    ("v0-ffffffff-long", "\xff"*20, "peer-f"),
  31                    ("v0-11111111-long", "\x11"*20, "peer-11")]
  32         for (key_s, peerid, nickname) in servers:
  33             tubid_b32 = base32.b2a(peerid)
  34             furl = "pb://%s@nowhere/fake" % tubid_b32
  35             ann = { "version": 0,
  36                     "service-name": "storage",
  37                     "anonymous-storage-FURL": furl,
  38                     "permutation-seed-base32": "",
  39                     "nickname": unicode(nickname),
  40                     "app-versions": {}, # need #466 and v2 introducer
  41                     "my-version": "ver",
  42                     "oldest-supported": "oldest",
  43                     }
  44             s = NativeStorageServer(key_s, ann)
  45             sb.test_add_server(peerid, s) # XXX: maybe use key_s?
  46         c = FakeClient()
  47         c.storage_broker = sb
  48         return c
  49
  50     def render_json(self, page):
  51         d = self.render1(page, args={"output": ["json"]})
  52         return d
  53
  54     def test_literal(self):
  55         c = self.create_fake_client()
  56         lcr = web_check_results.LiteralCheckResultsRenderer(c)
  57
  58         d = self.render1(lcr)
  59         def _check(html):
  60             s = self.remove_tags(html)
  61             self.failUnlessIn("Literal files are always healthy", s)
  62         d.addCallback(_check)
  63         d.addCallback(lambda ignored:
  64                       self.render1(lcr, args={"return_to": ["FOOURL"]}))
  65         def _check_return_to(html):
  66             s = self.remove_tags(html)
  67             self.failUnlessIn("Literal files are always healthy", s)
  68             self.failUnlessIn('<a href="FOOURL">Return to file.</a>',
  69                               html)
  70         d.addCallback(_check_return_to)
  71         d.addCallback(lambda ignored: self.render_json(lcr))
  72         def _check_json(json):
  73             j = simplejson.loads(json)
  74             self.failUnlessEqual(j["storage-index"], "")
  75             self.failUnlessEqual(j["results"]["healthy"], True)
  76         d.addCallback(_check_json)
  77         return d
  78
  79     def test_check(self):
  80         c = self.create_fake_client()
  81         serverid_1 = "\x00"*20
  82         serverid_f = "\xff"*20
  83         u = uri.CHKFileURI("\x00"*16, "\x00"*32, 3, 10, 1234)
  84         data = { "count_shares_needed": 3,
  85                  "count_shares_expected": 9,
  86                  "count_shares_good": 10,
  87                  "count_good_share_hosts": 11,
  88                  "count_recoverable_versions": 1,
  89                  "count_unrecoverable_versions": 0,
  90                  "servers_responding": [],
  91                  "sharemap": {"shareid1": [serverid_1, serverid_f]},
  92                  "count_wrong_shares": 0,
  93                  "list_corrupt_shares": [],
  94                  "count_corrupt_shares": 0,
  95                  "list_incompatible_shares": [],
  96                  "count_incompatible_shares": 0,
  97                  "report": [], "share_problems": [], "servermap": None,
  98                  }
  99         cr = check_results.CheckResults(u, u.get_storage_index(),
 100                                         healthy=True, recoverable=True,
 101                                         needs_rebalancing=False,
 102                                         summary="groovy",
 103                                         **data)
 104         w = web_check_results.CheckResultsRenderer(c, cr)
 105         html = self.render2(w)
 106         s = self.remove_tags(html)
 107         self.failUnlessIn("File Check Results for SI=2k6avp", s) # abbreviated
 108         self.failUnlessIn("Healthy : groovy", s)
 109         self.failUnlessIn("Share Counts: need 3-of-9, have 10", s)
 110         self.failUnlessIn("Hosts with good shares: 11", s)
 111         self.failUnlessIn("Corrupt shares: none", s)
 112         self.failUnlessIn("Wrong Shares: 0", s)
 113         self.failUnlessIn("Recoverable Versions: 1", s)
 114         self.failUnlessIn("Unrecoverable Versions: 0", s)
 115
 116         cr = check_results.CheckResults(u, u.get_storage_index(),
 117                                         healthy=False, recoverable=True,
 118                                         needs_rebalancing=False,
 119                                         summary="ungroovy",
 120                                         **data)
 121         w = web_check_results.CheckResultsRenderer(c, cr)
 122         html = self.render2(w)
 123         s = self.remove_tags(html)
 124         self.failUnlessIn("File Check Results for SI=2k6avp", s) # abbreviated
 125         self.failUnlessIn("Not Healthy! : ungroovy", s)
 126
 127         data["count_corrupt_shares"] = 1
 128         data["list_corrupt_shares"] = [(serverid_1, u.get_storage_index(), 2)]
 129         cr = check_results.CheckResults(u, u.get_storage_index(),
 130                                         healthy=False, recoverable=False,
 131                                         needs_rebalancing=False,
 132                                         summary="rather dead",
 133                                         **data)
 134         w = web_check_results.CheckResultsRenderer(c, cr)
 135         html = self.render2(w)
 136         s = self.remove_tags(html)
 137         self.failUnlessIn("File Check Results for SI=2k6avp", s) # abbreviated
 138         self.failUnlessIn("Not Recoverable! : rather dead", s)
 139         self.failUnlessIn("Corrupt shares: Share ID Nickname Node ID sh#2 peer-0 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", s)
 140
 141         html = self.render2(w)
 142         s = self.remove_tags(html)
 143         self.failUnlessIn("File Check Results for SI=2k6avp", s) # abbreviated
 144         self.failUnlessIn("Not Recoverable! : rather dead", s)
 145
 146         html = self.render2(w, args={"return_to": ["FOOURL"]})
 147         self.failUnlessIn('<a href="FOOURL">Return to file/directory.</a>',
 148                           html)
 149
 150         d = self.render_json(w)
 151         def _check_json(jdata):
 152             j = simplejson.loads(jdata)
 153             self.failUnlessEqual(j["summary"], "rather dead")
 154             self.failUnlessEqual(j["storage-index"],
 155                                  "2k6avpjga3dho3zsjo6nnkt7n4")
 156             expected = {'needs-rebalancing': False,
 157                         'count-shares-expected': 9,
 158                         'healthy': False,
 159                         'count-unrecoverable-versions': 0,
 160                         'count-shares-needed': 3,
 161                         'sharemap': {"shareid1":
 162                                      ["aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
 163                                       "77777777777777777777777777777777"]},
 164                         'count-recoverable-versions': 1,
 165                         'list-corrupt-shares':
 166                         [["aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
 167                           "2k6avpjga3dho3zsjo6nnkt7n4", 2]],
 168                         'count-good-share-hosts': 11,
 169                         'count-wrong-shares': 0,
 170                         'count-shares-good': 10,
 171                         'count-corrupt-shares': 1,
 172                         'servers-responding': [],
 173                         'recoverable': False,
 174                         }
 175             self.failUnlessEqual(j["results"], expected)
 176         d.addCallback(_check_json)
 177         d.addCallback(lambda ignored: self.render1(w))
 178         def _check(html):
 179             s = self.remove_tags(html)
 180             self.failUnlessIn("File Check Results for SI=2k6avp", s)
 181             self.failUnlessIn("Not Recoverable! : rather dead", s)
 182         d.addCallback(_check)
 183         return d
 184
 185
 186     def test_check_and_repair(self):
 187         c = self.create_fake_client()
 188         serverid_1 = "\x00"*20
 189         serverid_f = "\xff"*20
 190         u = uri.CHKFileURI("\x00"*16, "\x00"*32, 3, 10, 1234)
 191
 192         data = { "count_shares_needed": 3,
 193                  "count_shares_expected": 10,
 194                  "count_shares_good": 6,
 195                  "count_good_share_hosts": 7,
 196                  "count_recoverable_versions": 1,
 197                  "count_unrecoverable_versions": 0,
 198                  "servers_responding": [],
 199                  "sharemap": {"shareid1": [serverid_1, serverid_f]},
 200                  "count_wrong_shares": 0,
 201                  "list_corrupt_shares": [],
 202                  "count_corrupt_shares": 0,
 203                  "list_incompatible_shares": [],
 204                  "count_incompatible_shares": 0,
 205                  "report": [], "share_problems": [], "servermap": None,
 206                  }
 207         pre_cr = check_results.CheckResults(u, u.get_storage_index(),
 208                                             healthy=False, recoverable=True,
 209                                             needs_rebalancing=False,
 210                                             summary="illing",
 211                                             **data)
 212
 213         data = { "count_shares_needed": 3,
 214                  "count_shares_expected": 10,
 215                  "count_shares_good": 10,
 216                  "count_good_share_hosts": 11,
 217                  "count_recoverable_versions": 1,
 218                  "count_unrecoverable_versions": 0,
 219                  "servers_responding": [],
 220                  "sharemap": {"shareid1": [serverid_1, serverid_f]},
 221                  "count_wrong_shares": 0,
 222                  "count_corrupt_shares": 0,
 223                  "list_corrupt_shares": [],
 224                  "list_incompatible_shares": [],
 225                  "count_incompatible_shares": 0,
 226                  "report": [], "share_problems": [], "servermap": None,
 227                  }
 228         post_cr = check_results.CheckResults(u, u.get_storage_index(),
 229                                              healthy=True, recoverable=True,
 230                                              needs_rebalancing=False,
 231                                              summary="groovy",
 232                                              **data)
 233
 234         crr = check_results.CheckAndRepairResults(u.get_storage_index())
 235         crr.pre_repair_results = pre_cr
 236         crr.post_repair_results = post_cr
 237         crr.repair_attempted = False
 238
 239         w = web_check_results.CheckAndRepairResultsRenderer(c, crr)
 240         html = self.render2(w)
 241         s = self.remove_tags(html)
 242
 243         self.failUnlessIn("File Check-And-Repair Results for SI=2k6avp", s)
 244         self.failUnlessIn("Healthy : groovy", s)
 245         self.failUnlessIn("No repair necessary", s)
 246         self.failUnlessIn("Post-Repair Checker Results:", s)
 247         self.failUnlessIn("Share Counts: need 3-of-10, have 10", s)
 248
 249         crr.repair_attempted = True
 250         crr.repair_successful = True
 251         html = self.render2(w)
 252         s = self.remove_tags(html)
 253
 254         self.failUnlessIn("File Check-And-Repair Results for SI=2k6avp", s)
 255         self.failUnlessIn("Healthy : groovy", s)
 256         self.failUnlessIn("Repair successful", s)
 257         self.failUnlessIn("Post-Repair Checker Results:", s)
 258
 259         crr.repair_attempted = True
 260         crr.repair_successful = False
 261         post_cr = check_results.CheckResults(u, u.get_storage_index(),
 262                                              healthy=False, recoverable=True,
 263                                              needs_rebalancing=False,
 264                                              summary="better",
 265                                              **data)
 266         crr.post_repair_results = post_cr
 267         html = self.render2(w)
 268         s = self.remove_tags(html)
 269
 270         self.failUnlessIn("File Check-And-Repair Results for SI=2k6avp", s)
 271         self.failUnlessIn("Not Healthy! : better", s)
 272         self.failUnlessIn("Repair unsuccessful", s)
 273         self.failUnlessIn("Post-Repair Checker Results:", s)
 274
 275         crr.repair_attempted = True
 276         crr.repair_successful = False
 277         post_cr = check_results.CheckResults(u, u.get_storage_index(),
 278                                              healthy=False, recoverable=False,
 279                                              needs_rebalancing=False,
 280                                              summary="worse",
 281                                              **data)
 282         crr.post_repair_results = post_cr
 283         html = self.render2(w)
 284         s = self.remove_tags(html)
 285
 286         self.failUnlessIn("File Check-And-Repair Results for SI=2k6avp", s)
 287         self.failUnlessIn("Not Recoverable! : worse", s)
 288         self.failUnlessIn("Repair unsuccessful", s)
 289         self.failUnlessIn("Post-Repair Checker Results:", s)
 290
 291         d = self.render_json(w)
 292         def _got_json(data):
 293             j = simplejson.loads(data)
 294             self.failUnlessEqual(j["repair-attempted"], True)
 295             self.failUnlessEqual(j["storage-index"],
 296                                  "2k6avpjga3dho3zsjo6nnkt7n4")
 297             self.failUnlessEqual(j["pre-repair-results"]["summary"], "illing")
 298             self.failUnlessEqual(j["post-repair-results"]["summary"], "worse")
 299         d.addCallback(_got_json)
 300
 301         w2 = web_check_results.CheckAndRepairResultsRenderer(c, None)
 302         d.addCallback(lambda ignored: self.render_json(w2))
 303         def _got_lit_results(data):
 304             j = simplejson.loads(data)
 305             self.failUnlessEqual(j["repair-attempted"], False)
 306             self.failUnlessEqual(j["storage-index"], "")
 307         d.addCallback(_got_lit_results)
 308         return d
 309
 310 class BalancingAct(GridTestMixin, unittest.TestCase):
 311     # test for #1115 regarding the 'count-good-share-hosts' metric
 312
 313
 314     def add_server(self, server_number, readonly=False):
 315         assert self.g, "I tried to find a grid at self.g, but failed"
 316         ss = self.g.make_server(server_number, readonly)
 317         #log.msg("just created a server, number: %s => %s" % (server_number, ss,))
 318         self.g.add_server(server_number, ss)
 319
 320     def add_server_with_share(self, server_number, uri, share_number=None,
 321                               readonly=False):
 322         self.add_server(server_number, readonly)
 323         if share_number is not None:
 324             self.copy_share_to_server(uri, share_number, server_number)
 325
 326     def copy_share_to_server(self, uri, share_number, server_number):
 327         ss = self.g.servers_by_number[server_number]
 328         # Copy share i from the directory associated with the first
 329         # storage server to the directory associated with this one.
 330         assert self.g, "I tried to find a grid at self.g, but failed"
 331         assert self.shares, "I tried to find shares at self.shares, but failed"
 332         old_share_location = self.shares[share_number][2]
 333         new_share_location = os.path.join(ss.storedir, "shares")
 334         si = tahoe_uri.from_string(self.uri).get_storage_index()
 335         new_share_location = os.path.join(new_share_location,
 336                                           storage_index_to_dir(si))
 337         if not os.path.exists(new_share_location):
 338             os.makedirs(new_share_location)
 339         new_share_location = os.path.join(new_share_location,
 340                                           str(share_number))
 341         if old_share_location != new_share_location:
 342             shutil.copy(old_share_location, new_share_location)
 343         shares = self.find_uri_shares(uri)
 344         # Make sure that the storage server has the share.
 345         self.failUnless((share_number, ss.my_nodeid, new_share_location)
 346                         in shares)
 347
 348     def _pretty_shares_chart(self, uri):
 349         # Servers are labeled A-Z, shares are labeled 0-9
 350         letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
 351         assert len(self.g.servers_by_number) < len(letters), \
 352             "This little printing function is only meant for < 26 servers"
 353         shares_chart = {}
 354         names = dict(zip([ss.my_nodeid
 355                           for _,ss in self.g.servers_by_number.iteritems()],
 356                          letters))
 357         for shnum, serverid, _ in self.find_uri_shares(uri):
 358             shares_chart.setdefault(shnum, []).append(names[serverid])
 359         return shares_chart
 360
 361     def test_good_share_hosts(self):
 362         self.basedir = "checker/BalancingAct/1115"
 363         self.set_up_grid(num_servers=1)
 364         c0 = self.g.clients[0]
 365         c0.DEFAULT_ENCODING_PARAMETERS['happy'] = 1
 366         c0.DEFAULT_ENCODING_PARAMETERS['n'] = 4
 367         c0.DEFAULT_ENCODING_PARAMETERS['k'] = 3
 368
 369         DATA = "data" * 100
 370         d = c0.upload(Data(DATA, convergence=""))
 371         def _stash_immutable(ur):
 372             self.imm = c0.create_node_from_uri(ur.get_uri())
 373             self.uri = self.imm.get_uri()
 374         d.addCallback(_stash_immutable)
 375         d.addCallback(lambda ign:
 376             self.find_uri_shares(self.uri))
 377         def _store_shares(shares):
 378             self.shares = shares
 379         d.addCallback(_store_shares)
 380
 381         def add_three(_, i):
 382             # Add a new server with just share 3
 383             self.add_server_with_share(i, self.uri, 3)
 384             #print self._pretty_shares_chart(self.uri)
 385         for i in range(1,5):
 386             d.addCallback(add_three, i)
 387
 388         def _check_and_repair(_):
 389             return self.imm.check_and_repair(Monitor())
 390         def _check_counts(crr, shares_good, good_share_hosts):
 391             prr = crr.get_post_repair_results()
 392             #print self._pretty_shares_chart(self.uri)
 393             self.failUnlessEqual(prr.get_share_counter_good(), shares_good)
 394             self.failUnlessEqual(prr.get_host_counter_good_shares(),
 395                                  good_share_hosts)
 396
 397         """
 398         Initial sharemap:
 399             0:[A] 1:[A] 2:[A] 3:[A,B,C,D,E]
 400           4 good shares, but 5 good hosts
 401         After deleting all instances of share #3 and repairing:
 402             0:[A,B], 1:[A,C], 2:[A,D], 3:[E]
 403           Still 4 good shares and 5 good hosts
 404             """
 405         d.addCallback(_check_and_repair)
 406         d.addCallback(_check_counts, 4, 5)
 407         d.addCallback(lambda _: self.delete_shares_numbered(self.uri, [3]))
 408         d.addCallback(_check_and_repair)
 409         d.addCallback(_check_counts, 4, 5)
 410         d.addCallback(lambda _: [self.g.break_server(sid)
 411                                  for sid in self.g.get_all_serverids()])
 412         d.addCallback(_check_and_repair)
 413         d.addCallback(_check_counts, 0, 0)
 414         return d
 415
 416 class AddLease(GridTestMixin, unittest.TestCase):
 417     # test for #875, in which failures in the add-lease call cause
 418     # false-negatives in the checker
 419
 420     def test_875(self):
 421         self.basedir = "checker/AddLease/875"
 422         self.set_up_grid(num_servers=1)
 423         c0 = self.g.clients[0]
 424         c0.DEFAULT_ENCODING_PARAMETERS['happy'] = 1
 425         self.uris = {}
 426         DATA = "data" * 100
 427         d = c0.upload(Data(DATA, convergence=""))
 428         def _stash_immutable(ur):
 429             self.imm = c0.create_node_from_uri(ur.get_uri())
 430         d.addCallback(_stash_immutable)
 431         d.addCallback(lambda ign:
 432             c0.create_mutable_file(MutableData("contents")))
 433         def _stash_mutable(node):
 434             self.mut = node
 435         d.addCallback(_stash_mutable)
 436
 437         def _check_cr(cr, which):
 438             self.failUnless(cr.is_healthy(), which)
 439
 440         # these two should work normally
 441         d.addCallback(lambda ign: self.imm.check(Monitor(), add_lease=True))
 442         d.addCallback(_check_cr, "immutable-normal")
 443         d.addCallback(lambda ign: self.mut.check(Monitor(), add_lease=True))
 444         d.addCallback(_check_cr, "mutable-normal")
 445
 446         really_did_break = []
 447         # now break the server's remote_add_lease call
 448         def _break_add_lease(ign):
 449             def broken_add_lease(*args, **kwargs):
 450                 really_did_break.append(1)
 451                 raise KeyError("intentional failure, should be ignored")
 452             assert self.g.servers_by_number[0].remote_add_lease
 453             self.g.servers_by_number[0].remote_add_lease = broken_add_lease
 454         d.addCallback(_break_add_lease)
 455
 456         # and confirm that the files still look healthy
 457         d.addCallback(lambda ign: self.mut.check(Monitor(), add_lease=True))
 458         d.addCallback(_check_cr, "mutable-broken")
 459         d.addCallback(lambda ign: self.imm.check(Monitor(), add_lease=True))
 460         d.addCallback(_check_cr, "immutable-broken")
 461
 462         d.addCallback(lambda ign: self.failUnless(really_did_break))
 463         return d
 464
 465 class CounterHolder(object):
 466     def __init__(self):
 467         self._num_active_block_fetches = 0
 468         self._max_active_block_fetches = 0
 469
 470 from allmydata.immutable.checker import ValidatedReadBucketProxy
 471 class MockVRBP(ValidatedReadBucketProxy):
 472     def __init__(self, sharenum, bucket, share_hash_tree, num_blocks, block_size, share_size, counterholder):
 473         ValidatedReadBucketProxy.__init__(self, sharenum, bucket,
 474                                           share_hash_tree, num_blocks,
 475                                           block_size, share_size)
 476         self.counterholder = counterholder
 477
 478     def get_block(self, blocknum):
 479         self.counterholder._num_active_block_fetches += 1
 480         if self.counterholder._num_active_block_fetches > self.counterholder._max_active_block_fetches:
 481             self.counterholder._max_active_block_fetches = self.counterholder._num_active_block_fetches
 482         d = ValidatedReadBucketProxy.get_block(self, blocknum)
 483         def _mark_no_longer_active(res):
 484             self.counterholder._num_active_block_fetches -= 1
 485             return res
 486         d.addBoth(_mark_no_longer_active)
 487         return d
 488
 489 class TooParallel(GridTestMixin, unittest.TestCase):
 490     # bug #1395: immutable verifier was aggressively parallized, checking all
 491     # blocks of all shares at the same time, blowing our memory budget and
 492     # crashing with MemoryErrors on >1GB files.
 493
 494     def test_immutable(self):
 495         import allmydata.immutable.checker
 496         origVRBP = allmydata.immutable.checker.ValidatedReadBucketProxy
 497
 498         self.basedir = "checker/TooParallel/immutable"
 499
 500         # If any code asks to instantiate a ValidatedReadBucketProxy,
 501         # we give them a MockVRBP which is configured to use our
 502         # CounterHolder.
 503         counterholder = CounterHolder()
 504         def make_mock_VRBP(*args, **kwargs):
 505             return MockVRBP(counterholder=counterholder, *args, **kwargs)
 506         allmydata.immutable.checker.ValidatedReadBucketProxy = make_mock_VRBP
 507
 508         d = defer.succeed(None)
 509         def _start(ign):
 510             self.set_up_grid(num_servers=4)
 511             self.c0 = self.g.clients[0]
 512             self.c0.DEFAULT_ENCODING_PARAMETERS = { "k": 1,
 513                                                "happy": 4,
 514                                                "n": 4,
 515                                                "max_segment_size": 5,
 516                                                }
 517             self.uris = {}
 518             DATA = "data" * 100 # 400/5 = 80 blocks
 519             return self.c0.upload(Data(DATA, convergence=""))
 520         d.addCallback(_start)
 521         def _do_check(ur):
 522             n = self.c0.create_node_from_uri(ur.get_uri())
 523             return n.check(Monitor(), verify=True)
 524         d.addCallback(_do_check)
 525         def _check(cr):
 526             # the verifier works on all 4 shares in parallel, but only
 527             # fetches one block from each share at a time, so we expect to
 528             # see 4 parallel fetches
 529             self.failUnlessEqual(counterholder._max_active_block_fetches, 4)
 530         d.addCallback(_check)
 531         def _clean_up(res):
 532             allmydata.immutable.checker.ValidatedReadBucketProxy = origVRBP
 533             return res
 534         d.addBoth(_clean_up)
 535         return d
 536
 537     test_immutable.timeout = 80