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- // 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
- }
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