negotiate idle connection state lifetime

work towards #20

utils/minmax.go

@@ -58,6 +58,13 @@ func MaxDuration(a, b time.Duration) time.Duration {
 	return b
 }
 
+func MinDuration(a, b time.Duration) time.Duration {
+	if a > b {
+		return b
+	}
+	return a
+}
+
 // AbsDuration returns the absolute value of a time duration
 func AbsDuration(d time.Duration) time.Duration {
 	if d >= 0 {

utils/minmax_test.go

@@ -33,6 +33,11 @@ var _ = Describe("Min / Max", func() {
 			Expect(MaxDuration(time.Microsecond, time.Nanosecond)).To(Equal(time.Microsecond))
 			Expect(MaxDuration(time.Nanosecond, time.Microsecond)).To(Equal(time.Microsecond))
 		})
+
+		It("returns the minimum duration", func() {
+			Expect(MinDuration(time.Microsecond, time.Nanosecond)).To(Equal(time.Nanosecond))
+			Expect(MinDuration(time.Nanosecond, time.Microsecond)).To(Equal(time.Nanosecond))
+		})
 	})
 
 	Context("Min", func() {