mirror of
https://github.com/ethereum/go-ethereum.git
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117 lines
3.6 KiB
Go
117 lines
3.6 KiB
Go
// Copyright 2018 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 flowcontrol implements a client side flow control mechanism
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package flowcontrol
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import (
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"math/rand"
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"testing"
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"time"
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"github.com/ethereum/go-ethereum/common/mclock"
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)
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type testNode struct {
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node *ClientNode
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bufLimit, bandwidth uint64
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waitUntil mclock.AbsTime
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index, totalCost uint64
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}
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const (
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testMaxCost = 1000000
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testLength = 100000
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)
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func (n *testNode) send(t *testing.T, now mclock.AbsTime) bool {
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if now < n.waitUntil {
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return false
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}
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n.index++
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if ok, _, _ := n.node.AcceptRequest(n.index, testMaxCost); !ok {
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t.Fatalf("Rejected request after expected waiting time has passed")
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}
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rcost := uint64(rand.Int63n(testMaxCost))
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bv, _ := n.node.RequestProcessed(n.index, testMaxCost, rcost)
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if bv < testMaxCost {
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n.waitUntil = now + mclock.AbsTime((testMaxCost-bv)*1001000/n.bandwidth)
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}
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//n.waitUntil = now + mclock.AbsTime(float64(testMaxCost)*1001000/float64(n.bandwidth)*(1-float64(bv)/float64(n.bufLimit)))
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n.totalCost += rcost
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return true
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}
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func TestConstantTotalBandwidth(t *testing.T) {
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testConstantTotalBandwidth(t, 10, 1, 0)
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testConstantTotalBandwidth(t, 10, 1, 1)
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testConstantTotalBandwidth(t, 30, 1, 0)
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testConstantTotalBandwidth(t, 30, 2, 3)
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testConstantTotalBandwidth(t, 100, 1, 0)
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testConstantTotalBandwidth(t, 100, 3, 5)
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testConstantTotalBandwidth(t, 100, 5, 10)
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}
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func testConstantTotalBandwidth(t *testing.T, nodeCount, maxCapacityNodes, randomSend int) {
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clock := &mclock.Simulated{}
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nodes := make([]*testNode, nodeCount)
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var totalBandwidth uint64
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for i, _ := range nodes {
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nodes[i] = &testNode{bandwidth: uint64(50000 + rand.Intn(100000))}
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totalBandwidth += nodes[i].bandwidth
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}
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m := NewClientManager(PieceWiseLinear{{0, totalBandwidth}}, clock)
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for _, n := range nodes {
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n.bufLimit = n.bandwidth * 6000 //uint64(2000+rand.Intn(10000))
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n.node = NewClientNode(m, &ServerParams{BufLimit: n.bufLimit, MinRecharge: n.bandwidth})
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}
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maxNodes := make([]int, maxCapacityNodes)
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for i, _ := range maxNodes {
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// we don't care if some indexes are selected multiple times
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// in that case we have fewer max nodes
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maxNodes[i] = rand.Intn(nodeCount)
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}
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for i := 0; i < testLength; i++ {
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now := clock.Now()
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for _, idx := range maxNodes {
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for nodes[idx].send(t, now) {
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}
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}
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if rand.Intn(testLength) < maxCapacityNodes*3 {
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maxNodes[rand.Intn(maxCapacityNodes)] = rand.Intn(nodeCount)
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}
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sendCount := randomSend
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for sendCount > 0 {
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if nodes[rand.Intn(nodeCount)].send(t, now) {
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sendCount--
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}
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}
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clock.Run(time.Millisecond)
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}
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var totalCost uint64
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for _, n := range nodes {
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totalCost += n.totalCost
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}
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ratio := float64(totalCost) / float64(totalBandwidth) / testLength
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if ratio < 0.98 || ratio > 1.02 {
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t.Errorf("totalCost/totalBandwidth/testLength ratio incorrect (expected: 1, got: %f)", ratio)
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}
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}
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