first commit

utilities/jitter.go

@@ -0,0 +1,24 @@
+package utilities
+
+import (
+	"math"
+	"math/rand/v2"
+	"time"
+)
+
+var (
+	ApplyJitter = DefaultApplyJitter
+)
+
+func DefaultApplyJitter(pauseDuration time.Duration, jitter time.Duration) time.Duration {
+	switch {
+	case jitter == 0, pauseDuration == 0:
+		return pauseDuration
+	case jitter > pauseDuration:
+		pauseDuration, jitter = jitter, pauseDuration
+	}
+	min := pauseDuration.Nanoseconds() - jitter.Nanoseconds()
+	max := pauseDuration.Nanoseconds() + jitter.Nanoseconds()
+	rnd := int64(math.Max(float64(rand.Int64N(max-min)+min), 0))
+	return time.Duration(rnd)
+}

utilities/math.go

@@ -0,0 +1,8 @@
+package utilities
+
+import "math/big"
+
+func ProductWouldOverflowInt64(a, b int64) (product int64, overflows bool) {
+	results := new(big.Int).Mul(big.NewInt(a), big.NewInt(b))
+	return results.Int64(), !results.IsInt64()
+}