les: renamed lespay to vflux (#22347)

les/vflux/client/timestats_test.go

@@ -0,0 +1,137 @@
+// Copyright 2020 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package client
+
+import (
+	"math"
+	"math/rand"
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/les/utils"
+)
+
+func TestTransition(t *testing.T) {
+	var epsilon = 0.01
+	var cases = []time.Duration{
+		time.Millisecond, minResponseTime,
+		time.Second, time.Second * 5, maxResponseTime,
+	}
+	for _, c := range cases {
+		got := StatScaleToTime(TimeToStatScale(c))
+		if float64(got)*(1+epsilon) < float64(c) || float64(got)*(1-epsilon) > float64(c) {
+			t.Fatalf("Failed to transition back")
+		}
+	}
+	// If the time is too large(exceeds the max response time.
+	got := StatScaleToTime(TimeToStatScale(2 * maxResponseTime))
+	if float64(got)*(1+epsilon) < float64(maxResponseTime) || float64(got)*(1-epsilon) > float64(maxResponseTime) {
+		t.Fatalf("Failed to transition back")
+	}
+}
+
+var maxResponseWeights = TimeoutWeights(maxResponseTime)
+
+func TestValue(t *testing.T) {
+	noexp := utils.ExpirationFactor{Factor: 1}
+	for i := 0; i < 1000; i++ {
+		max := minResponseTime + time.Duration(rand.Int63n(int64(maxResponseTime-minResponseTime)))
+		min := minResponseTime + time.Duration(rand.Int63n(int64(max-minResponseTime)))
+		timeout := max/2 + time.Duration(rand.Int63n(int64(maxResponseTime-max/2)))
+		s := makeRangeStats(min, max, 1000, noexp)
+		value := s.Value(TimeoutWeights(timeout), noexp)
+		// calculate the average weight (the average of the given range of the half cosine
+		// weight function).
+		minx := math.Pi / 2 * float64(min) / float64(timeout)
+		maxx := math.Pi / 2 * float64(max) / float64(timeout)
+		avgWeight := (math.Sin(maxx) - math.Sin(minx)) / (maxx - minx)
+		expv := 1000 * avgWeight
+		if expv < 0 {
+			expv = 0
+		}
+		if value < expv-10 || value > expv+10 {
+			t.Errorf("Value failed (expected %v, got %v)", expv, value)
+		}
+	}
+}
+
+func TestAddSubExpire(t *testing.T) {
+	var (
+		sum1, sum2                 ResponseTimeStats
+		sum1ValueExp, sum2ValueExp float64
+		logOffset                  utils.Fixed64
+	)
+	for i := 0; i < 1000; i++ {
+		exp := utils.ExpFactor(logOffset)
+		max := minResponseTime + time.Duration(rand.Int63n(int64(maxResponseTime-minResponseTime)))
+		min := minResponseTime + time.Duration(rand.Int63n(int64(max-minResponseTime)))
+		s := makeRangeStats(min, max, 1000, exp)
+		value := s.Value(maxResponseWeights, exp)
+		sum1.AddStats(&s)
+		sum1ValueExp += value
+		if rand.Intn(2) == 1 {
+			sum2.AddStats(&s)
+			sum2ValueExp += value
+		}
+		logOffset += utils.Float64ToFixed64(0.001 / math.Log(2))
+		sum1ValueExp -= sum1ValueExp * 0.001
+		sum2ValueExp -= sum2ValueExp * 0.001
+	}
+	exp := utils.ExpFactor(logOffset)
+	sum1Value := sum1.Value(maxResponseWeights, exp)
+	if sum1Value < sum1ValueExp*0.99 || sum1Value > sum1ValueExp*1.01 {
+		t.Errorf("sum1Value failed (expected %v, got %v)", sum1ValueExp, sum1Value)
+	}
+	sum2Value := sum2.Value(maxResponseWeights, exp)
+	if sum2Value < sum2ValueExp*0.99 || sum2Value > sum2ValueExp*1.01 {
+		t.Errorf("sum2Value failed (expected %v, got %v)", sum2ValueExp, sum2Value)
+	}
+	diff := sum1
+	diff.SubStats(&sum2)
+	diffValue := diff.Value(maxResponseWeights, exp)
+	diffValueExp := sum1ValueExp - sum2ValueExp
+	if diffValue < diffValueExp*0.99 || diffValue > diffValueExp*1.01 {
+		t.Errorf("diffValue failed (expected %v, got %v)", diffValueExp, diffValue)
+	}
+}
+
+func TestTimeout(t *testing.T) {
+	testTimeoutRange(t, 0, time.Second)
+	testTimeoutRange(t, time.Second, time.Second*2)
+	testTimeoutRange(t, time.Second, maxResponseTime)
+}
+
+func testTimeoutRange(t *testing.T, min, max time.Duration) {
+	s := makeRangeStats(min, max, 1000, utils.ExpirationFactor{Factor: 1})
+	for i := 2; i < 9; i++ {
+		to := s.Timeout(float64(i) / 10)
+		exp := max - (max-min)*time.Duration(i)/10
+		tol := (max - min) / 50
+		if to < exp-tol || to > exp+tol {
+			t.Errorf("Timeout failed (expected %v, got %v)", exp, to)
+		}
+	}
+}
+
+func makeRangeStats(min, max time.Duration, amount float64, exp utils.ExpirationFactor) ResponseTimeStats {
+	var s ResponseTimeStats
+	amount /= 1000
+	for i := 0; i < 1000; i++ {
+		s.Add(min+(max-min)*time.Duration(i)/999, amount, exp)
+	}
+	return s
+}