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- // Copyright 2019 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 flowcontrol
- import (
- "math/rand"
- "testing"
- "time"
- "github.com/ethereum/go-ethereum/common/mclock"
- )
- type testNode struct {
- node *ClientNode
- bufLimit, capacity uint64
- waitUntil mclock.AbsTime
- index, totalCost uint64
- }
- const (
- testMaxCost = 1000000
- testLength = 100000
- )
- // testConstantTotalCapacity simulates multiple request sender nodes and verifies
- // whether the total amount of served requests matches the expected value based on
- // the total capacity and the duration of the test.
- // Some nodes are sending requests occasionally so that their buffer should regularly
- // reach the maximum while other nodes (the "max capacity nodes") are sending at the
- // maximum permitted rate. The max capacity nodes are changed multiple times during
- // a single test.
- func TestConstantTotalCapacity(t *testing.T) {
- testConstantTotalCapacity(t, 10, 1, 0)
- testConstantTotalCapacity(t, 10, 1, 1)
- testConstantTotalCapacity(t, 30, 1, 0)
- testConstantTotalCapacity(t, 30, 2, 3)
- testConstantTotalCapacity(t, 100, 1, 0)
- testConstantTotalCapacity(t, 100, 3, 5)
- testConstantTotalCapacity(t, 100, 5, 10)
- }
- func testConstantTotalCapacity(t *testing.T, nodeCount, maxCapacityNodes, randomSend int) {
- clock := &mclock.Simulated{}
- nodes := make([]*testNode, nodeCount)
- var totalCapacity uint64
- for i := range nodes {
- nodes[i] = &testNode{capacity: uint64(50000 + rand.Intn(100000))}
- totalCapacity += nodes[i].capacity
- }
- m := NewClientManager(PieceWiseLinear{{0, totalCapacity}}, clock)
- for _, n := range nodes {
- n.bufLimit = n.capacity * 6000
- n.node = NewClientNode(m, ServerParams{BufLimit: n.bufLimit, MinRecharge: n.capacity})
- }
- maxNodes := make([]int, maxCapacityNodes)
- for i := range maxNodes {
- // we don't care if some indexes are selected multiple times
- // in that case we have fewer max nodes
- maxNodes[i] = rand.Intn(nodeCount)
- }
- var sendCount int
- for i := 0; i < testLength; i++ {
- now := clock.Now()
- for _, idx := range maxNodes {
- for nodes[idx].send(t, now) {
- }
- }
- if rand.Intn(testLength) < maxCapacityNodes*3 {
- maxNodes[rand.Intn(maxCapacityNodes)] = rand.Intn(nodeCount)
- }
- sendCount += randomSend
- failCount := randomSend * 10
- for sendCount > 0 && failCount > 0 {
- if nodes[rand.Intn(nodeCount)].send(t, now) {
- sendCount--
- } else {
- failCount--
- }
- }
- clock.Run(time.Millisecond)
- }
- var totalCost uint64
- for _, n := range nodes {
- totalCost += n.totalCost
- }
- ratio := float64(totalCost) / float64(totalCapacity) / testLength
- if ratio < 0.98 || ratio > 1.02 {
- t.Errorf("totalCost/totalCapacity/testLength ratio incorrect (expected: 1, got: %f)", ratio)
- }
- }
- func (n *testNode) send(t *testing.T, now mclock.AbsTime) bool {
- if now < n.waitUntil {
- return false
- }
- n.index++
- if ok, _, _ := n.node.AcceptRequest(0, n.index, testMaxCost); !ok {
- t.Fatalf("Rejected request after expected waiting time has passed")
- }
- rcost := uint64(rand.Int63n(testMaxCost))
- bv := n.node.RequestProcessed(0, n.index, testMaxCost, rcost)
- if bv < testMaxCost {
- n.waitUntil = now + mclock.AbsTime((testMaxCost-bv)*1001000/n.capacity)
- }
- n.totalCost += rcost
- return true
- }
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