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test(agent): fix TestAgent_Metadata/Once flake #8613

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Merged
merged 11 commits into from
Jul 20, 2023
Merged

test(agent): fix TestAgent_Metadata/Once flake #8613

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3b0b1f3
flake(agent) fix `TestAgent_Metadata/Once` flake
coadler Jul 19, 2023
cf2f7dc
fixup! flake(agent) fix `TestAgent_Metadata/Once` flake
coadler Jul 19, 2023
3f73d16
fixup! flake(agent) fix `TestAgent_Metadata/Once` flake
coadler Jul 20, 2023
7b4097a
fixup! flake(agent) fix `TestAgent_Metadata/Once` flake
coadler Jul 20, 2023
76b3bb8
more debug logging
coadler Jul 20, 2023
4b08319
fixup! more debug logging
coadler Jul 20, 2023
2ae25c5
fixup! more debug logging
coadler Jul 20, 2023
07a5b9a
fixup! more debug logging
coadler Jul 20, 2023
d195640
fixup! more debug logging
coadler Jul 20, 2023
14eb5a7
fixup! more debug logging
coadler Jul 20, 2023
b55e04b
fixup! more debug logging
coadler Jul 20, 2023
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fixup! more debug logging
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@coadler
coadler committed Jul 20, 2023
commit 07a5b9ab940ea7e813f2e866d1fc23c40290b5f5
21 changes: 15 additions & 6 deletions agent/agent.go
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Original file line number Diff line number Diff line change
Expand Up @@ -298,17 +298,26 @@ type metadataResultAndKey struct {
}

type trySingleflight struct {
m sync.Map
mu sync.Mutex
m map[string]struct{}
}

func (t *trySingleflight) Do(key string, fn func()) {
_, loaded := t.m.LoadOrStore(key, struct{}{})
if !loaded {
// There is already a goroutine running for this key.
t.mu.Lock()
_, ok := t.m[key]
if ok {
t.mu.Unlock()
return
}

defer t.m.Delete(key)
t.m[key] = struct{}{}
t.mu.Unlock()
defer func() {
t.mu.Lock()
delete(t.m, key)
t.mu.Unlock()
}()

fn()
}

Expand All @@ -328,7 +337,7 @@ func (a *agent) reportMetadataLoop(ctx context.Context) {
// a goroutine running for a given key. This is to prevent a build-up of
// goroutines waiting on Do when the script takes many multiples of
// baseInterval to run.
var flight trySingleflight
var flight = trySingleflight{m: map[string]struct{}{}}

for {
var delay time.Duration
Expand Down