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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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