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Fix chain cover update to handle events with duplicate auth events (#9210)

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Erik Johnston 2021-01-22 19:44:08 +00:00 committed by GitHub
parent 28f255d5f3
commit 056327457f
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3 changed files with 14 additions and 1 deletions
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1
changelog.d/9210.bugfix Normal file
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@ -0,0 +1 @@
Fix chain cover update to handle events with duplicate auth events. Introduced in v1.26.0rc1.

2
synapse/util/iterutils.py
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@ -78,7 +78,7 @@ def sorted_topologically(
if node not in degree_map:
continue
for edge in edges:
for edge in set(edges):
if edge in degree_map:
degree_map[node] += 1

12
tests/util/test_itertools.py
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@ -92,3 +92,15 @@ class SortTopologically(TestCase):
# Valid orderings are `[1, 3, 2, 4]` or `[1, 2, 3, 4]`, but we should
# always get the same one.
self.assertEqual(list(sorted_topologically([4, 3, 2, 1], graph)), [1, 2, 3, 4])
def test_duplicates(self):
"Test that a graph with duplicate edges work"
graph = {1: [], 2: [1, 1], 3: [2, 2], 4: [3]} # type: Dict[int, List[int]]
self.assertEqual(list(sorted_topologically([4, 3, 2, 1], graph)), [1, 2, 3, 4])
def test_multiple_paths(self):
"Test that a graph with multiple paths between two nodes work"
graph = {1: [], 2: [1], 3: [2], 4: [3, 2, 1]} # type: Dict[int, List[int]]
self.assertEqual(list(sorted_topologically([4, 3, 2, 1], graph)), [1, 2, 3, 4])