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0851646e48
This PR adds service value measurement statistics to the light client. It also adds a private API that makes these statistics accessible. A follow-up PR will add the new server pool which uses these statistics to select servers with good performance. This document describes the function of the new components: https://gist.github.com/zsfelfoldi/3c7ace895234b7b345ab4f71dab102d4 Co-authored-by: rjl493456442 <garyrong0905@gmail.com> Co-authored-by: rjl493456442 <garyrong0905@gmail.com>
162 lines
6.1 KiB
Go
162 lines
6.1 KiB
Go
// Copyright 2020 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package client
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import (
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"math/rand"
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"testing"
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"github.com/ethereum/go-ethereum/les/utils"
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)
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func checkU64(t *testing.T, name string, value, exp uint64) {
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if value != exp {
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t.Errorf("Incorrect value for %s: got %d, expected %d", name, value, exp)
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}
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}
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func checkF64(t *testing.T, name string, value, exp, tol float64) {
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if value < exp-tol || value > exp+tol {
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t.Errorf("Incorrect value for %s: got %f, expected %f", name, value, exp)
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}
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}
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func TestServerBasket(t *testing.T) {
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var s serverBasket
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s.init(2)
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// add some requests with different request value factors
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s.updateRvFactor(1)
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noexp := utils.ExpirationFactor{Factor: 1}
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s.add(0, 1000, 10000, noexp)
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s.add(1, 3000, 60000, noexp)
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s.updateRvFactor(10)
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s.add(0, 4000, 4000, noexp)
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s.add(1, 2000, 4000, noexp)
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s.updateRvFactor(10)
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// check basket contents directly
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checkU64(t, "s.basket[0].amount", s.basket.items[0].amount, 5000*basketFactor)
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checkU64(t, "s.basket[0].value", s.basket.items[0].value, 50000)
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checkU64(t, "s.basket[1].amount", s.basket.items[1].amount, 5000*basketFactor)
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checkU64(t, "s.basket[1].value", s.basket.items[1].value, 100000)
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// transfer 50% of the contents of the basket
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transfer1 := s.transfer(0.5)
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checkU64(t, "transfer1[0].amount", transfer1.items[0].amount, 2500*basketFactor)
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checkU64(t, "transfer1[0].value", transfer1.items[0].value, 25000)
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checkU64(t, "transfer1[1].amount", transfer1.items[1].amount, 2500*basketFactor)
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checkU64(t, "transfer1[1].value", transfer1.items[1].value, 50000)
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// add more requests
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s.updateRvFactor(100)
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s.add(0, 1000, 100, noexp)
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// transfer 25% of the contents of the basket
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transfer2 := s.transfer(0.25)
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checkU64(t, "transfer2[0].amount", transfer2.items[0].amount, (2500+1000)/4*basketFactor)
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checkU64(t, "transfer2[0].value", transfer2.items[0].value, (25000+10000)/4)
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checkU64(t, "transfer2[1].amount", transfer2.items[1].amount, 2500/4*basketFactor)
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checkU64(t, "transfer2[1].value", transfer2.items[1].value, 50000/4)
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}
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func TestConvertMapping(t *testing.T) {
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b := requestBasket{items: []basketItem{{3, 3}, {1, 1}, {2, 2}}}
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oldMap := []string{"req3", "req1", "req2"}
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newMap := []string{"req1", "req2", "req3", "req4"}
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init := requestBasket{items: []basketItem{{2, 2}, {4, 4}, {6, 6}, {8, 8}}}
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bc := b.convertMapping(oldMap, newMap, init)
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checkU64(t, "bc[0].amount", bc.items[0].amount, 1)
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checkU64(t, "bc[1].amount", bc.items[1].amount, 2)
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checkU64(t, "bc[2].amount", bc.items[2].amount, 3)
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checkU64(t, "bc[3].amount", bc.items[3].amount, 4) // 8 should be scaled down to 4
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}
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func TestReqValueFactor(t *testing.T) {
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var ref referenceBasket
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ref.basket = requestBasket{items: make([]basketItem, 4)}
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for i := range ref.basket.items {
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ref.basket.items[i].amount = uint64(i+1) * basketFactor
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ref.basket.items[i].value = uint64(i+1) * basketFactor
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}
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ref.init(4)
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rvf := ref.reqValueFactor([]uint64{1000, 2000, 3000, 4000})
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// expected value is (1000000+2000000+3000000+4000000) / (1*1000+2*2000+3*3000+4*4000) = 10000000/30000 = 333.333
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checkF64(t, "reqValueFactor", rvf, 333.333, 1)
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}
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func TestNormalize(t *testing.T) {
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for cycle := 0; cycle < 100; cycle += 1 {
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// Initialize data for testing
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valueRange, lower := 1000000, 1000000
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ref := referenceBasket{basket: requestBasket{items: make([]basketItem, 10)}}
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for i := 0; i < 10; i++ {
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ref.basket.items[i].amount = uint64(rand.Intn(valueRange) + lower)
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ref.basket.items[i].value = uint64(rand.Intn(valueRange) + lower)
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}
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ref.normalize()
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// Check whether SUM(amount) ~= SUM(value)
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var sumAmount, sumValue uint64
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for i := 0; i < 10; i++ {
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sumAmount += ref.basket.items[i].amount
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sumValue += ref.basket.items[i].value
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}
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var epsilon = 0.01
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if float64(sumAmount)*(1+epsilon) < float64(sumValue) || float64(sumAmount)*(1-epsilon) > float64(sumValue) {
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t.Fatalf("Failed to normalize sumAmount: %d sumValue: %d", sumAmount, sumValue)
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}
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}
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}
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func TestReqValueAdjustment(t *testing.T) {
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var s1, s2 serverBasket
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s1.init(3)
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s2.init(3)
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cost1 := []uint64{30000, 60000, 90000}
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cost2 := []uint64{100000, 200000, 300000}
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var ref referenceBasket
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ref.basket = requestBasket{items: make([]basketItem, 3)}
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for i := range ref.basket.items {
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ref.basket.items[i].amount = 123 * basketFactor
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ref.basket.items[i].value = 123 * basketFactor
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}
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ref.init(3)
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// initial reqValues are expected to be {1, 1, 1}
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checkF64(t, "reqValues[0]", ref.reqValues[0], 1, 0.01)
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checkF64(t, "reqValues[1]", ref.reqValues[1], 1, 0.01)
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checkF64(t, "reqValues[2]", ref.reqValues[2], 1, 0.01)
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var logOffset utils.Fixed64
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for period := 0; period < 1000; period++ {
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exp := utils.ExpFactor(logOffset)
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s1.updateRvFactor(ref.reqValueFactor(cost1))
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s2.updateRvFactor(ref.reqValueFactor(cost2))
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// throw in random requests into each basket using their internal pricing
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for i := 0; i < 1000; i++ {
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reqType, reqAmount := uint32(rand.Intn(3)), uint32(rand.Intn(10)+1)
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reqCost := uint64(reqAmount) * cost1[reqType]
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s1.add(reqType, reqAmount, reqCost, exp)
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reqType, reqAmount = uint32(rand.Intn(3)), uint32(rand.Intn(10)+1)
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reqCost = uint64(reqAmount) * cost2[reqType]
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s2.add(reqType, reqAmount, reqCost, exp)
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}
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ref.add(s1.transfer(0.1))
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ref.add(s2.transfer(0.1))
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ref.normalize()
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ref.updateReqValues()
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logOffset += utils.Float64ToFixed64(0.1)
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}
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checkF64(t, "reqValues[0]", ref.reqValues[0], 0.5, 0.01)
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checkF64(t, "reqValues[1]", ref.reqValues[1], 1, 0.01)
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checkF64(t, "reqValues[2]", ref.reqValues[2], 1.5, 0.01)
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}
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