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derp: fix flaky shuffle test

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Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>
This commit is contained in:
Kristoffer Dalby 2025-09-11 11:08:28 +02:00
parent d41fb4d540
commit fc3e8ad18d
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2 changed files with 4 additions and 2 deletions
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5
hscontrol/derp/derp.go
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@ -140,10 +140,13 @@ var crc64Table = crc64.MakeTable(crc64.ISO)
var (
derpRandomOnce sync.Once
derpRandomInst *rand.Rand
derpRandomMu sync.RWMutex
derpRandomMu sync.Mutex
)
func derpRandom() *rand.Rand {
derpRandomMu.Lock()
defer derpRandomMu.Unlock()
derpRandomOnce.Do(func() {
seed := cmp.Or(viper.GetString("dns.base_domain"), time.Now().String())
rnd := rand.New(rand.NewSource(0))

1
hscontrol/derp/derp_test.go
View File

@ -240,7 +240,6 @@ func TestShuffleDERPMapEdgeCases(t *testing.T) {
}
}
func TestShuffleDERPMapWithoutBaseDomain(t *testing.T) {
viper.Reset()
resetDerpRandomForTesting()