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backport: performance improvements for the event query API (#7319) (#9334)

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* Performance improvements for the event query API (#7319)

Rework the implementation of event query parsing and execution to
improve performance and reduce memory usage.

Previous memory and CPU profiles of the pubsub service showed query
processing as a significant hotspot. While we don't have evidence that
this is visibly hurting users, fixing it is fairly easy and self-contained.

Updates #6439.

Typical benchmark results comparing the original implementation (PEG) with the reworked implementation (Custom):
```
TEST                        TIME/OP  BYTES/OP  ALLOCS/OP  SPEEDUP   MEM SAVING
BenchmarkParsePEG-12       51716 ns  526832    27
BenchmarkParseCustom-12     2167 ns    4616    17         23.8x     99.1%
BenchmarkMatchPEG-12        3086 ns    1097    22
BenchmarkMatchCustom-12    294.2 ns      64     3         10.5x     94.1%
```
This commit is contained in:
mmsqe
2022-09-13 10:42:14 +02:00
committed by GitHub
parent 93ead3d0e5
commit e80dd00894
32 changed files with 2316 additions and 758 deletions
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libs/pubsub/example_test.go
+1 -1
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@@ -24,7 +24,7 @@ func TestExample(t *testing.T) {
})
ctx := context.Background()
subscription, err := s.Subscribe(ctx, "example-client", query.MustParse("abci.account.name='John'"))
subscription, err := s.Subscribe(ctx, "example-client", query.MustCompile("abci.account.name='John'"))
require.NoError(t, err)
err = s.PublishWithEvents(ctx, "Tombstone", map[string][]string{"abci.account.name": {"John"}})
require.NoError(t, err)