src/allmydata/test/test_hung_server.py

   1 # -*- coding: utf-8 -*-
   2
   3 import os, shutil
   4 from twisted.trial import unittest
   5 from twisted.internet import defer
   6 from allmydata import uri
   7 from allmydata.util.consumer import download_to_data
   8 from allmydata.immutable import upload
   9 from allmydata.mutable.common import UnrecoverableFileError
  10 from allmydata.storage.common import storage_index_to_dir
  11 from allmydata.test.no_network import GridTestMixin
  12 from allmydata.test.common import ShouldFailMixin, _corrupt_share_data
  13 from allmydata.interfaces import NotEnoughSharesError
  14
  15 immutable_plaintext = "data" * 10000
  16 mutable_plaintext = "muta" * 10000
  17
  18 class HungServerDownloadTest(GridTestMixin, ShouldFailMixin, unittest.TestCase):
  19     # Many of these tests take around 60 seconds on François's ARM buildslave:
  20     # http://tahoe-lafs.org/buildbot/builders/FranXois%20lenny-armv5tel
  21     # allmydata.test.test_hung_server.HungServerDownloadTest.test_2_good_8_broken_duplicate_share_fail once ERRORed after 197 seconds on Midnight Magic's NetBSD buildslave:
  22     # http://tahoe-lafs.org/buildbot/builders/MM%20netbsd4%20i386%20warp
  23     # MM's buildslave varies a lot in how long it takes to run tests.
  24
  25     timeout = 240
  26
  27     def _break(self, servers):
  28         for (id, ss) in servers:
  29             self.g.break_server(id)
  30
  31     def _hang(self, servers, **kwargs):
  32         for (id, ss) in servers:
  33             self.g.hang_server(id, **kwargs)
  34
  35     def _unhang(self, servers, **kwargs):
  36         for (id, ss) in servers:
  37             self.g.unhang_server(id, **kwargs)
  38
  39     def _delete_all_shares_from(self, servers):
  40         serverids = [id for (id, ss) in servers]
  41         for (i_shnum, i_serverid, i_sharefile) in self.shares:
  42             if i_serverid in serverids:
  43                 os.unlink(i_sharefile)
  44
  45     def _corrupt_all_shares_in(self, servers, corruptor_func):
  46         serverids = [id for (id, ss) in servers]
  47         for (i_shnum, i_serverid, i_sharefile) in self.shares:
  48             if i_serverid in serverids:
  49                 self._corrupt_share((i_shnum, i_sharefile), corruptor_func)
  50
  51     def _copy_all_shares_from(self, from_servers, to_server):
  52         serverids = [id for (id, ss) in from_servers]
  53         for (i_shnum, i_serverid, i_sharefile) in self.shares:
  54             if i_serverid in serverids:
  55                 self._copy_share((i_shnum, i_sharefile), to_server)
  56
  57     def _copy_share(self, share, to_server):
  58         (sharenum, sharefile) = share
  59         (id, ss) = to_server
  60         shares_dir = os.path.join(ss.original.storedir, "shares")
  61         si = uri.from_string(self.uri).get_storage_index()
  62         si_dir = os.path.join(shares_dir, storage_index_to_dir(si))
  63         if not os.path.exists(si_dir):
  64             os.makedirs(si_dir)
  65         new_sharefile = os.path.join(si_dir, str(sharenum))
  66         shutil.copy(sharefile, new_sharefile)
  67         self.shares = self.find_shares(self.uri)
  68         # Make sure that the storage server has the share.
  69         self.failUnless((sharenum, ss.original.my_nodeid, new_sharefile)
  70                         in self.shares)
  71
  72     def _corrupt_share(self, share, corruptor_func):
  73         (sharenum, sharefile) = share
  74         data = open(sharefile, "rb").read()
  75         newdata = corruptor_func(data)
  76         os.unlink(sharefile)
  77         wf = open(sharefile, "wb")
  78         wf.write(newdata)
  79         wf.close()
  80
  81     def _set_up(self, mutable, testdir, num_clients=1, num_servers=10):
  82         self.mutable = mutable
  83         if mutable:
  84             self.basedir = "hung_server/mutable_" + testdir
  85         else:
  86             self.basedir = "hung_server/immutable_" + testdir
  87
  88         self.set_up_grid(num_clients=num_clients, num_servers=num_servers)
  89
  90         self.c0 = self.g.clients[0]
  91         nm = self.c0.nodemaker
  92         self.servers = [(id, ss) for (id, ss) in nm.storage_broker.get_all_servers()]
  93
  94         if mutable:
  95             d = nm.create_mutable_file(mutable_plaintext)
  96             def _uploaded_mutable(node):
  97                 self.uri = node.get_uri()
  98                 self.shares = self.find_shares(self.uri)
  99             d.addCallback(_uploaded_mutable)
 100         else:
 101             data = upload.Data(immutable_plaintext, convergence="")
 102             d = self.c0.upload(data)
 103             def _uploaded_immutable(upload_res):
 104                 self.uri = upload_res.uri
 105                 self.shares = self.find_shares(self.uri)
 106             d.addCallback(_uploaded_immutable)
 107         return d
 108
 109     def _start_download(self):
 110         n = self.c0.create_node_from_uri(self.uri)
 111         if self.mutable:
 112             d = n.download_best_version()
 113             stage_4_d = None # currently we aren't doing any tests which require this for mutable files
 114         else:
 115             d = download_to_data(n)
 116             stage_4_d = n._downloader._all_downloads.keys()[0]._stage_4_d # too ugly! FIXME
 117         return (d, stage_4_d,)
 118
 119     def _wait_for_data(self, n):
 120         if self.mutable:
 121             d = n.download_best_version()
 122         else:
 123             d = download_to_data(n)
 124         return d
 125
 126     def _check(self, resultingdata):
 127         if self.mutable:
 128             self.failUnlessEqual(resultingdata, mutable_plaintext)
 129         else:
 130             self.failUnlessEqual(resultingdata, immutable_plaintext)
 131
 132     def _download_and_check(self):
 133         d, stage4d = self._start_download()
 134         d.addCallback(self._check)
 135         return d
 136
 137     def _should_fail_download(self):
 138         if self.mutable:
 139             return self.shouldFail(UnrecoverableFileError, self.basedir,
 140                                    "no recoverable versions",
 141                                    self._download_and_check)
 142         else:
 143             return self.shouldFail(NotEnoughSharesError, self.basedir,
 144                                    "Failed to get enough shareholders",
 145                                    self._download_and_check)
 146
 147
 148     def test_10_good_sanity_check(self):
 149         d = defer.succeed(None)
 150         for mutable in [False, True]:
 151             d.addCallback(lambda ign: self._set_up(mutable, "test_10_good_sanity_check"))
 152             d.addCallback(lambda ign: self._download_and_check())
 153         return d
 154
 155     def test_10_good_copied_share(self):
 156         d = defer.succeed(None)
 157         for mutable in [False, True]:
 158             d.addCallback(lambda ign: self._set_up(mutable, "test_10_good_copied_share"))
 159             d.addCallback(lambda ign: self._copy_all_shares_from(self.servers[2:3], self.servers[0]))
 160             d.addCallback(lambda ign: self._download_and_check())
 161             return d
 162
 163     def test_3_good_7_noshares(self):
 164         d = defer.succeed(None)
 165         for mutable in [False, True]:
 166             d.addCallback(lambda ign: self._set_up(mutable, "test_3_good_7_noshares"))
 167             d.addCallback(lambda ign: self._delete_all_shares_from(self.servers[3:]))
 168             d.addCallback(lambda ign: self._download_and_check())
 169         return d
 170
 171     def test_2_good_8_broken_fail(self):
 172         d = defer.succeed(None)
 173         for mutable in [False, True]:
 174             d.addCallback(lambda ign: self._set_up(mutable, "test_2_good_8_broken_fail"))
 175             d.addCallback(lambda ign: self._break(self.servers[2:]))
 176             d.addCallback(lambda ign: self._should_fail_download())
 177         return d
 178
 179     def test_2_good_8_noshares_fail(self):
 180         d = defer.succeed(None)
 181         for mutable in [False, True]:
 182             d.addCallback(lambda ign: self._set_up(mutable, "test_2_good_8_noshares_fail"))
 183             d.addCallback(lambda ign: self._delete_all_shares_from(self.servers[2:]))
 184             d.addCallback(lambda ign: self._should_fail_download())
 185         return d
 186
 187     def test_2_good_8_broken_copied_share(self):
 188         d = defer.succeed(None)
 189         for mutable in [False, True]:
 190             d.addCallback(lambda ign: self._set_up(mutable, "test_2_good_8_broken_copied_share"))
 191             d.addCallback(lambda ign: self._copy_all_shares_from(self.servers[2:3], self.servers[0]))
 192             d.addCallback(lambda ign: self._break(self.servers[2:]))
 193             d.addCallback(lambda ign: self._download_and_check())
 194         return d
 195
 196     def test_2_good_8_broken_duplicate_share_fail(self):
 197         d = defer.succeed(None)
 198         for mutable in [False, True]:
 199             d.addCallback(lambda ign: self._set_up(mutable, "test_2_good_8_broken_duplicate_share_fail"))
 200             d.addCallback(lambda ign: self._copy_all_shares_from(self.servers[1:2], self.servers[0]))
 201             d.addCallback(lambda ign: self._break(self.servers[2:]))
 202             d.addCallback(lambda ign: self._should_fail_download())
 203         return d
 204
 205     # The tests below do not currently pass for mutable files.
 206
 207     def test_3_good_7_hung(self):
 208         d = defer.succeed(None)
 209         for mutable in [False]:
 210             d.addCallback(lambda ign: self._set_up(mutable, "test_3_good_7_hung"))
 211             d.addCallback(lambda ign: self._hang(self.servers[3:]))
 212             d.addCallback(lambda ign: self._download_and_check())
 213         return d
 214
 215     def test_2_good_8_hung_then_1_recovers(self):
 216         d = defer.succeed(None)
 217         for mutable in [False]:
 218             d.addCallback(lambda ign: self._set_up(mutable, "test_2_good_8_hung_then_1_recovers"))
 219             d.addCallback(lambda ign: self._hang(self.servers[2:3]))
 220             d.addCallback(lambda ign: self._hang(self.servers[3:]))
 221             d.addCallback(lambda ign: self._unhang(self.servers[2:3]))
 222             d.addCallback(lambda ign: self._download_and_check())
 223         return d
 224
 225     def test_2_good_8_hung_then_1_recovers_with_2_shares(self):
 226         d = defer.succeed(None)
 227         for mutable in [False]:
 228             d.addCallback(lambda ign: self._set_up(mutable, "test_2_good_8_hung_then_1_recovers_with_2_shares"))
 229             d.addCallback(lambda ign: self._copy_all_shares_from(self.servers[0:1], self.servers[2]))
 230             d.addCallback(lambda ign: self._hang(self.servers[2:3]))
 231             d.addCallback(lambda ign: self._hang(self.servers[3:]))
 232             d.addCallback(lambda ign: self._unhang(self.servers[2:3]))
 233             d.addCallback(lambda ign: self._download_and_check())
 234         return d
 235
 236     def test_failover_during_stage_4(self):
 237         # See #287
 238         d = defer.succeed(None)
 239         for mutable in [False]:
 240             d.addCallback(lambda ign: self._set_up(mutable, "test_failover_during_stage_4"))
 241             d.addCallback(lambda ign: self._corrupt_all_shares_in(self.servers[2:3], _corrupt_share_data))
 242             d.addCallback(lambda ign: self._set_up(mutable, "test_failover_during_stage_4"))
 243             d.addCallback(lambda ign: self._hang(self.servers[3:]))
 244             d.addCallback(lambda ign: self._start_download())
 245             def _after_starting_download((doned, started4d)):
 246                 started4d.addCallback(lambda ign: self._unhang(self.servers[3:4]))
 247                 doned.addCallback(self._check)
 248                 return doned
 249             d.addCallback(_after_starting_download)
 250
 251         return d