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bzrlib/tests/test_graph.py
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# Copyright (C) 2007, 2008, 2009 Canonical Ltd
 
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# Copyright (C) 2007 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
16
16
 
17
17
from bzrlib import (
18
18
    errors,
22
22
    )
23
23
from bzrlib.revision import NULL_REVISION
24
24
from bzrlib.tests import TestCaseWithMemoryTransport
25
 
from bzrlib.symbol_versioning import deprecated_in
26
25
 
27
26
 
28
27
# Ancestry 1:
238
237
                    'e':['d'], 'f':['e'], 'g':['f'], 'h':['d'], 'i':['g'],
239
238
                    'j':['h'], 'k':['h', 'i'], 'l':['k'], 'm':['l'], 'n':['m'],
240
239
                    'o':['n'], 'p':['o'], 'q':['p'], 'r':['q'], 's':['r'],
241
 
                    't':['i', 's'], 'u':['s', 'j'],
 
240
                    't':['i', 's'], 'u':['s', 'j'], 
242
241
                    }
243
242
 
244
243
# Graph where different walkers will race to find the common and uncommon
662
661
        self.assertEqual((set(['e']), set(['f', 'g'])),
663
662
                         graph.find_difference('e', 'f'))
664
663
 
665
 
 
666
664
    def test_stacked_parents_provider(self):
667
665
        parents1 = _mod_graph.DictParentsProvider({'rev2': ['rev3']})
668
666
        parents2 = _mod_graph.DictParentsProvider({'rev1': ['rev4']})
669
 
        stacked = _mod_graph.StackedParentsProvider([parents1, parents2])
670
 
        self.assertEqual({'rev1':['rev4'], 'rev2':['rev3']},
671
 
                         stacked.get_parent_map(['rev1', 'rev2']))
672
 
        self.assertEqual({'rev2':['rev3'], 'rev1':['rev4']},
673
 
                         stacked.get_parent_map(['rev2', 'rev1']))
674
 
        self.assertEqual({'rev2':['rev3']},
675
 
                         stacked.get_parent_map(['rev2', 'rev2']))
676
 
        self.assertEqual({'rev1':['rev4']},
677
 
                         stacked.get_parent_map(['rev1', 'rev1']))
678
 
    
679
 
    def test_stacked_parents_provider_overlapping(self):
680
 
        # rev2 is availible in both providers.
681
 
        # 1
682
 
        # |
683
 
        # 2
684
 
        parents1 = _mod_graph.DictParentsProvider({'rev2': ['rev1']})
685
 
        parents2 = _mod_graph.DictParentsProvider({'rev2': ['rev1']})
686
 
        stacked = _mod_graph.StackedParentsProvider([parents1, parents2])
687
 
        self.assertEqual({'rev2': ['rev1']},
688
 
                         stacked.get_parent_map(['rev2']))
689
 
 
690
 
    def test__stacked_parents_provider_deprecated(self):
691
 
        parents1 = _mod_graph.DictParentsProvider({'rev2': ['rev3']})
692
 
        parents2 = _mod_graph.DictParentsProvider({'rev1': ['rev4']})
693
 
        stacked = self.applyDeprecated(deprecated_in((1, 16, 0)),
694
 
                    _mod_graph._StackedParentsProvider, [parents1, parents2])
 
667
        stacked = _mod_graph._StackedParentsProvider([parents1, parents2])
695
668
        self.assertEqual({'rev1':['rev4'], 'rev2':['rev3']},
696
669
                         stacked.get_parent_map(['rev1', 'rev2']))
697
670
        self.assertEqual({'rev2':['rev3'], 'rev1':['rev4']},
725
698
        instrumented_graph.is_ancestor('rev2a', 'rev2b')
726
699
        self.assertTrue('null:' not in instrumented_provider.calls)
727
700
 
728
 
    def test_is_between(self):
729
 
        graph = self.make_graph(ancestry_1)
730
 
        self.assertEqual(True, graph.is_between('null:', 'null:', 'null:'))
731
 
        self.assertEqual(True, graph.is_between('rev1', 'null:', 'rev1'))
732
 
        self.assertEqual(True, graph.is_between('rev1', 'rev1', 'rev4'))
733
 
        self.assertEqual(True, graph.is_between('rev4', 'rev1', 'rev4'))
734
 
        self.assertEqual(True, graph.is_between('rev3', 'rev1', 'rev4'))
735
 
        self.assertEqual(False, graph.is_between('rev4', 'rev1', 'rev3'))
736
 
        self.assertEqual(False, graph.is_between('rev1', 'rev2a', 'rev4'))
737
 
        self.assertEqual(False, graph.is_between('null:', 'rev1', 'rev4'))
738
 
 
739
701
    def test_is_ancestor_boundary(self):
740
702
        """Ensure that we avoid searching the whole graph.
741
 
 
 
703
        
742
704
        This requires searching through b as a common ancestor, so we
743
705
        can identify that e is common.
744
706
        """
764
726
        # 'a' is not in the ancestry of 'c', and 'g' is a ghost
765
727
        expected['g'] = None
766
728
        self.assertEqual(expected, dict(graph.iter_ancestry(['a', 'c'])))
767
 
        expected.pop('a')
 
729
        expected.pop('a') 
768
730
        self.assertEqual(expected, dict(graph.iter_ancestry(['c'])))
769
731
 
770
732
    def test_filter_candidate_lca(self):
872
834
 
873
835
    def _run_heads_break_deeper(self, graph_dict, search):
874
836
        """Run heads on a graph-as-a-dict.
875
 
 
 
837
        
876
838
        If the search asks for the parents of 'deeper' the test will fail.
877
839
        """
878
840
        class stub(object):
1019
981
        :param next: A callable to advance the search.
1020
982
        """
1021
983
        for seen, recipe, included_keys, starts, stops in instructions:
1022
 
            # Adjust for recipe contract changes that don't vary for all the
1023
 
            # current tests.
1024
 
            recipe = ('search',) + recipe
1025
984
            next()
1026
985
            if starts is not None:
1027
986
                search.start_searching(starts)
1041
1000
        search = graph._make_breadth_first_searcher(['head'])
1042
1001
        # At the start, nothing has been seen, to its all excluded:
1043
1002
        result = search.get_result()
1044
 
        self.assertEqual(('search', set(['head']), set(['head']), 0),
 
1003
        self.assertEqual((set(['head']), set(['head']), 0),
1045
1004
            result.get_recipe())
1046
1005
        self.assertEqual(set(), result.get_keys())
1047
1006
        self.assertEqual(set(), search.seen)
1073
1032
        search.start_searching(['head'])
1074
1033
        # head has been seen:
1075
1034
        result = search.get_result()
1076
 
        self.assertEqual(('search', set(['head']), set(['child']), 1),
 
1035
        self.assertEqual((set(['head']), set(['child']), 1),
1077
1036
            result.get_recipe())
1078
1037
        self.assertEqual(set(['head']), result.get_keys())
1079
1038
        self.assertEqual(set(['head']), search.seen)
1110
1069
        search = graph._make_breadth_first_searcher(['head'])
1111
1070
        expected = [
1112
1071
            # NULL_REVISION and ghost1 have not been returned
1113
 
            (set(['head']),
1114
 
             (set(['head']), set(['child', NULL_REVISION, 'ghost1']), 1),
 
1072
            (set(['head']), (set(['head']), set(['child', 'ghost1']), 1),
1115
1073
             ['head'], None, [NULL_REVISION, 'ghost1']),
1116
1074
            # ghost1 has been returned, NULL_REVISION is to be returned in the
1117
1075
            # next iteration.
1124
1082
        search = graph._make_breadth_first_searcher(['head'])
1125
1083
        self.assertSeenAndResult(expected, search, search.next_with_ghosts)
1126
1084
 
1127
 
    def test_breadth_first_stop_searching_late(self):
1128
 
        # A client should be able to say 'stop node X' and have it excluded
1129
 
        # from the result even if X was seen in an older iteration of the
1130
 
        # search.
1131
 
        graph = self.make_graph({
1132
 
            'head':['middle'],
1133
 
            'middle':['child'],
1134
 
            'child':[NULL_REVISION],
1135
 
            NULL_REVISION:[],
1136
 
            })
1137
 
        search = graph._make_breadth_first_searcher(['head'])
1138
 
        expected = [
1139
 
            (set(['head']), (set(['head']), set(['middle']), 1),
1140
 
             ['head'], None, None),
1141
 
            (set(['head', 'middle']), (set(['head']), set(['child']), 2),
1142
 
             ['head', 'middle'], None, None),
1143
 
            # 'middle' came from the previous iteration, but we don't stop
1144
 
            # searching it until *after* advancing the searcher.
1145
 
            (set(['head', 'middle', 'child']),
1146
 
             (set(['head']), set(['middle', 'child']), 1),
1147
 
             ['head'], None, ['middle', 'child']),
1148
 
            ]
1149
 
        self.assertSeenAndResult(expected, search, search.next)
1150
 
        # using next_with_ghosts:
1151
 
        search = graph._make_breadth_first_searcher(['head'])
1152
 
        self.assertSeenAndResult(expected, search, search.next_with_ghosts)
1153
 
 
1154
1085
    def test_breadth_first_get_result_ghosts_are_excluded(self):
1155
1086
        graph = self.make_graph({
1156
1087
            'head':['child', 'ghost'],
1233
1164
        self.assertRaises(StopIteration, search.next)
1234
1165
        self.assertEqual(set(['head', 'ghost', NULL_REVISION]), search.seen)
1235
1166
        result = search.get_result()
1236
 
        self.assertEqual(('search', set(['ghost', 'head']), set(['ghost']), 2),
 
1167
        self.assertEqual((set(['ghost', 'head']), set(['ghost']), 2),
1237
1168
            result.get_recipe())
1238
1169
        self.assertEqual(set(['head', NULL_REVISION]), result.get_keys())
1239
1170
        # using next_with_ghosts:
1242
1173
        self.assertRaises(StopIteration, search.next)
1243
1174
        self.assertEqual(set(['head', 'ghost', NULL_REVISION]), search.seen)
1244
1175
        result = search.get_result()
1245
 
        self.assertEqual(('search', set(['ghost', 'head']), set(['ghost']), 2),
 
1176
        self.assertEqual((set(['ghost', 'head']), set(['ghost']), 2),
1246
1177
            result.get_recipe())
1247
1178
        self.assertEqual(set(['head', NULL_REVISION]), result.get_keys())
1248
1179
 
1412
1343
 
1413
1344
 
1414
1345
class TestCachingParentsProvider(tests.TestCase):
1415
 
    """These tests run with:
1416
 
 
1417
 
    self.inst_pp, a recording parents provider with a graph of a->b, and b is a
1418
 
    ghost.
1419
 
    self.caching_pp, a CachingParentsProvider layered on inst_pp.
1420
 
    """
1421
1346
 
1422
1347
    def setUp(self):
1423
1348
        super(TestCachingParentsProvider, self).setUp()
1442
1367
        self.assertEqual({}, self.caching_pp.get_parent_map(['b']))
1443
1368
        # No new calls
1444
1369
        self.assertEqual(['b'], self.inst_pp.calls)
 
1370
        self.assertEqual({'b':None}, self.caching_pp._cache)
1445
1371
 
1446
1372
    def test_get_parent_map_mixed(self):
1447
1373
        """Anything that can be returned from cache, should be"""
1459
1385
        # only present 1 time.
1460
1386
        self.assertEqual(['a', 'b'], sorted(self.inst_pp.calls))
1461
1387
 
1462
 
    def test_note_missing_key(self):
1463
 
        """After noting that a key is missing it is cached."""
1464
 
        self.caching_pp.note_missing_key('b')
1465
 
        self.assertEqual({}, self.caching_pp.get_parent_map(['b']))
1466
 
        self.assertEqual([], self.inst_pp.calls)
1467
 
        self.assertEqual(set(['b']), self.caching_pp.missing_keys)
1468
 
 
1469
 
 
1470
 
class TestCachingParentsProviderExtras(tests.TestCaseWithTransport):
1471
 
    """Test the behaviour when parents are provided that were not requested."""
1472
 
 
1473
 
    def setUp(self):
1474
 
        super(TestCachingParentsProviderExtras, self).setUp()
1475
 
        class ExtraParentsProvider(object):
1476
 
 
1477
 
            def get_parent_map(self, keys):
1478
 
                return {'rev1': [], 'rev2': ['rev1',]}
1479
 
 
1480
 
        self.inst_pp = InstrumentedParentsProvider(ExtraParentsProvider())
1481
 
        self.caching_pp = _mod_graph.CachingParentsProvider(
1482
 
            get_parent_map=self.inst_pp.get_parent_map)
1483
 
 
1484
 
    def test_uncached(self):
1485
 
        self.caching_pp.disable_cache()
1486
 
        self.assertEqual({'rev1': []},
1487
 
                         self.caching_pp.get_parent_map(['rev1']))
1488
 
        self.assertEqual(['rev1'], self.inst_pp.calls)
1489
 
        self.assertIs(None, self.caching_pp._cache)
1490
 
 
1491
 
    def test_cache_initially_empty(self):
1492
 
        self.assertEqual({}, self.caching_pp._cache)
1493
 
 
1494
 
    def test_cached(self):
1495
 
        self.assertEqual({'rev1': []},
1496
 
                         self.caching_pp.get_parent_map(['rev1']))
1497
 
        self.assertEqual(['rev1'], self.inst_pp.calls)
1498
 
        self.assertEqual({'rev1': [], 'rev2': ['rev1']},
1499
 
                         self.caching_pp._cache)
1500
 
        self.assertEqual({'rev1': []},
1501
 
                          self.caching_pp.get_parent_map(['rev1']))
1502
 
        self.assertEqual(['rev1'], self.inst_pp.calls)
1503
 
 
1504
 
    def test_disable_cache_clears_cache(self):
1505
 
        # Put something in the cache
1506
 
        self.caching_pp.get_parent_map(['rev1'])
1507
 
        self.assertEqual(2, len(self.caching_pp._cache))
1508
 
        self.caching_pp.disable_cache()
1509
 
        self.assertIs(None, self.caching_pp._cache)
1510
 
 
1511
 
    def test_enable_cache_raises(self):
1512
 
        e = self.assertRaises(AssertionError, self.caching_pp.enable_cache)
1513
 
        self.assertEqual('Cache enabled when already enabled.', str(e))
1514
 
 
1515
 
    def test_cache_misses(self):
1516
 
        self.caching_pp.get_parent_map(['rev3'])
1517
 
        self.caching_pp.get_parent_map(['rev3'])
1518
 
        self.assertEqual(['rev3'], self.inst_pp.calls)
1519
 
 
1520
 
    def test_no_cache_misses(self):
1521
 
        self.caching_pp.disable_cache()
1522
 
        self.caching_pp.enable_cache(cache_misses=False)
1523
 
        self.caching_pp.get_parent_map(['rev3'])
1524
 
        self.caching_pp.get_parent_map(['rev3'])
1525
 
        self.assertEqual(['rev3', 'rev3'], self.inst_pp.calls)
1526
 
 
1527
 
    def test_cache_extras(self):
1528
 
        self.assertEqual({}, self.caching_pp.get_parent_map(['rev3']))
1529
 
        self.assertEqual({'rev2': ['rev1']},
1530
 
                         self.caching_pp.get_parent_map(['rev2']))
1531
 
        self.assertEqual(['rev3'], self.inst_pp.calls)
1532
 
 
1533
1388
 
1534
1389
class TestCollapseLinearRegions(tests.TestCase):
1535
1390
 
1567
1422
        # 2 and 3 cannot be removed because 1 has 2 parents
1568
1423
        d = {1:[2, 3], 2:[4], 4:[6], 3:[5], 5:[6], 6:[7], 7:[]}
1569
1424
        self.assertCollapsed(d, d)
1570
 
 
1571
 
 
1572
 
class TestPendingAncestryResultGetKeys(TestCaseWithMemoryTransport):
1573
 
    """Tests for bzrlib.graph.PendingAncestryResult."""
1574
 
 
1575
 
    def test_get_keys(self):
1576
 
        builder = self.make_branch_builder('b')
1577
 
        builder.start_series()
1578
 
        builder.build_snapshot('rev-1', None, [
1579
 
            ('add', ('', 'root-id', 'directory', ''))])
1580
 
        builder.build_snapshot('rev-2', ['rev-1'], [])
1581
 
        builder.finish_series()
1582
 
        repo = builder.get_branch().repository
1583
 
        repo.lock_read()
1584
 
        self.addCleanup(repo.unlock)
1585
 
        result = _mod_graph.PendingAncestryResult(['rev-2'], repo)
1586
 
        self.assertEqual(set(['rev-1', 'rev-2']), set(result.get_keys()))
1587
 
 
1588
 
    def test_get_keys_excludes_ghosts(self):
1589
 
        builder = self.make_branch_builder('b')
1590
 
        builder.start_series()
1591
 
        builder.build_snapshot('rev-1', None, [
1592
 
            ('add', ('', 'root-id', 'directory', ''))])
1593
 
        builder.build_snapshot('rev-2', ['rev-1', 'ghost'], [])
1594
 
        builder.finish_series()
1595
 
        repo = builder.get_branch().repository
1596
 
        repo.lock_read()
1597
 
        self.addCleanup(repo.unlock)
1598
 
        result = _mod_graph.PendingAncestryResult(['rev-2'], repo)
1599
 
        self.assertEqual(sorted(['rev-1', 'rev-2']), sorted(result.get_keys()))
1600
 
 
1601
 
    def test_get_keys_excludes_null(self):
1602
 
        # Make a 'graph' with an iter_ancestry that returns NULL_REVISION
1603
 
        # somewhere other than the last element, which can happen in real
1604
 
        # ancestries.
1605
 
        class StubGraph(object):
1606
 
            def iter_ancestry(self, keys):
1607
 
                return [(NULL_REVISION, ()), ('foo', (NULL_REVISION,))]
1608
 
        result = _mod_graph.PendingAncestryResult(['rev-3'], None)
1609
 
        result_keys = result._get_keys(StubGraph())
1610
 
        # Only the non-null keys from the ancestry appear.
1611
 
        self.assertEqual(set(['foo']), set(result_keys))
1612
 
 
1613
 
 
1614
 
class TestPendingAncestryResultRefine(TestGraphBase):
1615
 
 
1616
 
    def test_refine(self):
1617
 
        # Used when pulling from a stacked repository, so test some revisions
1618
 
        # being satisfied from the stacking branch.
1619
 
        g = self.make_graph(
1620
 
            {"tip":["mid"], "mid":["base"], "tag":["base"],
1621
 
             "base":[NULL_REVISION], NULL_REVISION:[]})
1622
 
        result = _mod_graph.PendingAncestryResult(['tip', 'tag'], None)
1623
 
        result = result.refine(set(['tip']), set(['mid']))
1624
 
        self.assertEqual(set(['mid', 'tag']), result.heads)
1625
 
        result = result.refine(set(['mid', 'tag', 'base']),
1626
 
            set([NULL_REVISION]))
1627
 
        self.assertEqual(set([NULL_REVISION]), result.heads)
1628
 
        self.assertTrue(result.is_empty())
1629
 
 
1630
 
 
1631
 
class TestSearchResultRefine(TestGraphBase):
1632
 
 
1633
 
    def test_refine(self):
1634
 
        # Used when pulling from a stacked repository, so test some revisions
1635
 
        # being satisfied from the stacking branch.
1636
 
        g = self.make_graph(
1637
 
            {"tip":["mid"], "mid":["base"], "tag":["base"],
1638
 
             "base":[NULL_REVISION], NULL_REVISION:[]})
1639
 
        result = _mod_graph.SearchResult(set(['tip', 'tag']),
1640
 
            set([NULL_REVISION]), 4, set(['tip', 'mid', 'tag', 'base']))
1641
 
        result = result.refine(set(['tip']), set(['mid']))
1642
 
        recipe = result.get_recipe()
1643
 
        # We should be starting from tag (original head) and mid (seen ref)
1644
 
        self.assertEqual(set(['mid', 'tag']), recipe[1])
1645
 
        # We should be stopping at NULL (original stop) and tip (seen head)
1646
 
        self.assertEqual(set([NULL_REVISION, 'tip']), recipe[2])
1647
 
        self.assertEqual(3, recipe[3])
1648
 
        result = result.refine(set(['mid', 'tag', 'base']),
1649
 
            set([NULL_REVISION]))
1650
 
        recipe = result.get_recipe()
1651
 
        # We should be starting from nothing (NULL was known as a cut point)
1652
 
        self.assertEqual(set([]), recipe[1])
1653
 
        # We should be stopping at NULL (original stop) and tip (seen head) and
1654
 
        # tag (seen head) and mid(seen mid-point head). We could come back and
1655
 
        # define this as not including mid, for minimal results, but it is
1656
 
        # still 'correct' to include mid, and simpler/easier.
1657
 
        self.assertEqual(set([NULL_REVISION, 'tip', 'tag', 'mid']), recipe[2])
1658
 
        self.assertEqual(0, recipe[3])
1659
 
        self.assertTrue(result.is_empty())