From: Brian Warner Date: Wed, 6 Aug 2008 19:06:07 +0000 (-0700) Subject: mutable: more repair tests, one with force=True to check out merging X-Git-Url: https://git.rkrishnan.org/%5B/(%5B%5E?a=commitdiff_plain;h=c7c57bd85c5fbfda00d06266dc4c1997137a03f5;p=tahoe-lafs%2Ftahoe-lafs.git mutable: more repair tests, one with force=True to check out merging --- diff --git a/src/allmydata/mutable/node.py b/src/allmydata/mutable/node.py index 2d4b2026..e850c675 100644 --- a/src/allmydata/mutable/node.py +++ b/src/allmydata/mutable/node.py @@ -259,10 +259,10 @@ class MutableFileNode: ################################# # IRepairable - def repair(self, checker_results): + def repair(self, checker_results, force=False): assert ICheckerResults(checker_results) r = Repairer(self, checker_results) - d = r.start() + d = r.start(force) return d diff --git a/src/allmydata/test/test_mutable.py b/src/allmydata/test/test_mutable.py index 33f33c7e..6abfe1bd 100644 --- a/src/allmydata/test/test_mutable.py +++ b/src/allmydata/test/test_mutable.py @@ -13,6 +13,7 @@ from allmydata.util.hashutil import tagged_hash from allmydata.util.fileutil import make_dirs from allmydata.interfaces import IURI, IMutableFileURI, IUploadable, \ FileTooLargeError, IRepairResults +from allmydata.test.common import ShouldFailMixin from foolscap.eventual import eventually, fireEventually from foolscap.logging import log import sha @@ -26,6 +27,7 @@ from allmydata.mutable.retrieve import Retrieve from allmydata.mutable.publish import Publish from allmydata.mutable.servermap import ServerMap, ServermapUpdater from allmydata.mutable.layout import unpack_header, unpack_share +from allmydata.mutable.repair import MustForceRepairError # this "FastMutableFileNode" exists solely to speed up tests by using smaller # public/private keys. Once we switch to fast DSA-based keys, we can get rid @@ -1285,7 +1287,7 @@ class Checker(unittest.TestCase, CheckerMixin, PublishMixin): "test_verify_one_bad_encprivkey_uncheckable") return d -class Repair(unittest.TestCase, PublishMixin): +class Repair(unittest.TestCase, PublishMixin, ShouldFailMixin): def get_shares(self, s): all_shares = {} # maps (peerid, shnum) to share data @@ -1296,34 +1298,39 @@ class Repair(unittest.TestCase, PublishMixin): all_shares[ (peerid, shnum) ] = data return all_shares + def copy_shares(self, ignored=None): + self.old_shares.append(self.get_shares(self._storage)) + def test_repair_nop(self): + self.old_shares = [] d = self.publish_one() - def _published(res): - self.initial_shares = self.get_shares(self._storage) - d.addCallback(_published) + d.addCallback(self.copy_shares) d.addCallback(lambda res: self._fn.check()) d.addCallback(lambda check_results: self._fn.repair(check_results)) def _check_results(rres): self.failUnless(IRepairResults.providedBy(rres)) # TODO: examine results - new_shares = self.get_shares(self._storage) + self.copy_shares() + + initial_shares = self.old_shares[0] + new_shares = self.old_shares[1] # TODO: this really shouldn't change anything. When we implement # a "minimal-bandwidth" repairer", change this test to assert: #self.failUnlessEqual(new_shares, initial_shares) # all shares should be in the same place as before - self.failUnlessEqual(set(self.initial_shares.keys()), + self.failUnlessEqual(set(initial_shares.keys()), set(new_shares.keys())) # but they should all be at a newer seqnum. The IV will be # different, so the roothash will be too. - for key in self.initial_shares: + for key in initial_shares: (version0, seqnum0, root_hash0, IV0, k0, N0, segsize0, datalen0, - o0) = unpack_header(self.initial_shares[key]) + o0) = unpack_header(initial_shares[key]) (version1, seqnum1, root_hash1, @@ -1339,6 +1346,64 @@ class Repair(unittest.TestCase, PublishMixin): d.addCallback(_check_results) return d + def failIfSharesChanged(self, ignored=None): + old_shares = self.old_shares[-2] + current_shares = self.old_shares[-1] + self.failUnlessEqual(old_shares, current_shares) + + def test_merge(self): + self.old_shares = [] + d = self.publish_multiple() + # repair will refuse to merge multiple highest seqnums unless you + # pass force=True + d.addCallback(lambda res: + self._set_versions({0:3,2:3,4:3,6:3,8:3, + 1:4,3:4,5:4,7:4,9:4})) + d.addCallback(self.copy_shares) + d.addCallback(lambda res: self._fn.check()) + def _try_repair(check_results): + ex = "There were multiple recoverable versions with identical seqnums, so force=True must be passed to the repair() operation" + d2 = self.shouldFail(MustForceRepairError, "test_merge", ex, + self._fn.repair, check_results) + d2.addCallback(self.copy_shares) + d2.addCallback(self.failIfSharesChanged) + d2.addCallback(lambda res: check_results) + return d2 + d.addCallback(_try_repair) + d.addCallback(lambda check_results: + self._fn.repair(check_results, force=True)) + # this should give us 10 shares of the highest roothash + def _check_repair_results(rres): + pass # TODO + d.addCallback(_check_repair_results) + d.addCallback(lambda res: self._fn.get_servermap(MODE_CHECK)) + def _check_smap(smap): + self.failUnlessEqual(len(smap.recoverable_versions()), 1) + self.failIf(smap.unrecoverable_versions()) + # now, which should have won? + roothash_s4a = self.get_roothash_for(3) + roothash_s4b = self.get_roothash_for(4) + if roothash_s4b > roothash_s4a: + expected_contents = self.CONTENTS[4] + else: + expected_contents = self.CONTENTS[3] + new_versionid = smap.best_recoverable_version() + self.failUnlessEqual(new_versionid[0], 5) # seqnum 5 + d2 = self._fn.download_version(smap, new_versionid) + d2.addCallback(self.failUnlessEqual, expected_contents) + return d2 + d.addCallback(_check_smap) + return d + + def get_roothash_for(self, index): + # return the roothash for the first share we see in the saved set + shares = self._copied_shares[index] + for peerid in shares: + for shnum in shares[peerid]: + share = shares[peerid][shnum] + (version, seqnum, root_hash, IV, k, N, segsize, datalen, o) = \ + unpack_header(share) + return root_hash class MultipleEncodings(unittest.TestCase): def setUp(self):