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package mathz
import (
"math/rand"
"sync"
"time"
)
var (
r = rand.New(rand.NewSource(time.Now().UnixNano())) //nolint:gosec
mu sync.Mutex
)
func Int63n(n int64) int64 {
mu.Lock()
defer mu.Unlock()
return r.Int63n(n)
}
func Int63() int64 {
mu.Lock()
defer mu.Unlock()
return r.Int63()
}
// DurationWithPositiveJitter returns d with an added jitter in the range [0,jitterPercent% of the value) i.e. it's additive.
func DurationWithPositiveJitter(d time.Duration, jitterPercent int64) time.Duration {
r := (int64(d) * jitterPercent) / 100
jitter := Int63n(r)
return d + time.Duration(jitter)
}
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