Change algorithm of TCP relaying

mtglib/internal/relay/timeouts.go

@@ -0,0 +1,26 @@
+package relay
+
+import (
+	"math"
+	"math/rand"
+	"time"
+)
+
+func getConnectionTimeToLive() time.Duration {
+	return getTime(ConnectionTimeToLiveMin, ConnectionTimeToLiveMax)
+}
+
+func getTimeout() time.Duration {
+	return getTime(TimeoutMin, TimeoutMax)
+}
+
+func getTime(minDuration, maxDuration time.Duration) time.Duration {
+	minDurationInSeconds := minDuration.Seconds()
+	maxDurationInSeconds := maxDuration.Seconds()
+	middle := minDurationInSeconds + (maxDurationInSeconds-minDurationInSeconds)/2 // nolint: gomnd
+
+	number := minDurationInSeconds + rand.ExpFloat64()*middle
+	number = math.Round(math.Min(maxDurationInSeconds, number))
+
+	return time.Duration(number) * time.Second
+}