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Separate get_current_token into two. (#8113)

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The function is used for two purposes: 1) for subscribers of streams to
get a token they can use to get further updates with, and 2) for
replication to track position of the writers of the stream.

For streams with a single writer the two scenarios produce the same
result, however the situation becomes complicated for streams with
multiple writers. The current `MultiWriterIdGenerator` does not
correctly handle the first case (which is not an issue as its only used
for the `caches` stream which nothing subscribes to outside of
replication).
This commit is contained in:
Erik Johnston 2020-08-19 10:39:31 +01:00 • committed by GitHub
parent f40645e60b
commit 76d21d14a0
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6 changed files with 47 additions and 20 deletions
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16
tests/storage/test_id_generators.py
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@ -88,7 +88,7 @@ class MultiWriterIdGeneratorTestCase(HomeserverTestCase):
id_gen = self._create_id_generator()
self.assertEqual(id_gen.get_positions(), {"master": 7})
self.assertEqual(id_gen.get_current_token("master"), 7)
self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
# Try allocating a new ID gen and check that we only see position
# advanced after we leave the context manager.
@ -98,12 +98,12 @@ class MultiWriterIdGeneratorTestCase(HomeserverTestCase):
self.assertEqual(stream_id, 8)
self.assertEqual(id_gen.get_positions(), {"master": 7})
self.assertEqual(id_gen.get_current_token("master"), 7)
self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
self.get_success(_get_next_async())
self.assertEqual(id_gen.get_positions(), {"master": 8})
self.assertEqual(id_gen.get_current_token("master"), 8)
self.assertEqual(id_gen.get_current_token_for_writer("master"), 8)
def test_multi_instance(self):
"""Test that reads and writes from multiple processes are handled
@ -116,8 +116,8 @@ class MultiWriterIdGeneratorTestCase(HomeserverTestCase):
second_id_gen = self._create_id_generator("second")
self.assertEqual(first_id_gen.get_positions(), {"first": 3, "second": 7})
self.assertEqual(first_id_gen.get_current_token("first"), 3)
self.assertEqual(first_id_gen.get_current_token("second"), 7)
self.assertEqual(first_id_gen.get_current_token_for_writer("first"), 3)
self.assertEqual(first_id_gen.get_current_token_for_writer("second"), 7)
# Try allocating a new ID gen and check that we only see position
# advanced after we leave the context manager.
@ -166,7 +166,7 @@ class MultiWriterIdGeneratorTestCase(HomeserverTestCase):
id_gen = self._create_id_generator()
self.assertEqual(id_gen.get_positions(), {"master": 7})
self.assertEqual(id_gen.get_current_token("master"), 7)
self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
# Try allocating a new ID gen and check that we only see position
# advanced after we leave the context manager.
@ -176,9 +176,9 @@ class MultiWriterIdGeneratorTestCase(HomeserverTestCase):
self.assertEqual(stream_id, 8)
self.assertEqual(id_gen.get_positions(), {"master": 7})
self.assertEqual(id_gen.get_current_token("master"), 7)
self.assertEqual(id_gen.get_current_token_for_writer("master"), 7)
self.get_success(self.db_pool.runInteraction("test", _get_next_txn))
self.assertEqual(id_gen.get_positions(), {"master": 8})
self.assertEqual(id_gen.get_current_token("master"), 8)
self.assertEqual(id_gen.get_current_token_for_writer("master"), 8)