sflowgen/model_test.go at main · FastNetMon/sflowgen · GitHub

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package main

import (
	"math/rand"
	"net/netip"
	"testing"
	"time"
)

func TestAttackRateCurve(t *testing.T) {
	model := AttackModel{Config: RuntimeAttack{
		PeakRateBPS: 100,
		RampUp:      10 * time.Second,
		Hold:        20 * time.Second,
		RampDown:    10 * time.Second,
	}}

	checks := []struct {
		at   time.Duration
		want float64
	}{
		{0, 0},
		{5 * time.Second, 50},
		{10 * time.Second, 100},
		{25 * time.Second, 100},
		{35 * time.Second, 50},
		{40 * time.Second, 0},
	}
	for _, check := range checks {
		if got := model.RateAt(check.at); got != check.want {
			t.Fatalf("RateAt(%s)=%f, expected %f", check.at, got, check.want)
		}
	}
}

func TestAmbientOneSampleBudget(t *testing.T) {
	prefix := netip.MustParsePrefix("10.0.0.1/32")
	peer := netip.MustParsePrefix("198.18.0.0/15")
	cfg := RuntimeAmbient{
		Common: RuntimeCommon{
			SamplingRate: 10,
			Seed:         1,
			Packet: PacketConfig{
				MeanSize: 1000,
				MinSize:  1000,
				MaxSize:  1000,
			},
			Protocols: ProtocolMix{UDP: 1},
		},
		Networks: []RuntimeAmbientNetwork{{
			Prefix:        prefix,
			IncomingShare: 1,
			RateBPS:       80000,
			Hosts:         1,
			Correlation:   0.9,
			PeerPrefixes:  []netip.Prefix{peer},
		}},
	}
	model, err := NewAmbientModel(cfg)
	if err != nil {
		t.Fatal(err)
	}
	result, err := model.Tick(time.Second, 10)
	if err != nil {
		t.Fatal(err)
	}
	if len(result.Packets) != 1 {
		t.Fatalf("generated %d samples, expected 1", len(result.Packets))
	}
	if result.Packets[0].FrameLength != 1000 {
		t.Fatalf("frame length=%d, expected 1000", result.Packets[0].FrameLength)
	}
}

func TestAddressGenerationStaysInsidePrefix(t *testing.T) {
	rng := rand.New(rand.NewSource(1))
	prefixes := []netip.Prefix{
		netip.MustParsePrefix("10.0.0.0/24"),
		netip.MustParsePrefix("2001:db8:10::/64"),
	}
	for _, prefix := range prefixes {
		addresses, err := generateAddresses(prefix, 32, rng)
		if err != nil {
			t.Fatal(err)
		}
		for _, address := range addresses {
			if !prefix.Contains(address) {
				t.Fatalf("%s is outside %s", address, prefix)
			}
		}
	}
}

func TestAmbientBidirectionalShares(t *testing.T) {
	prefix := netip.MustParsePrefix("10.0.0.1/32")
	peer := netip.MustParsePrefix("198.18.0.0/15")
	cfg := RuntimeAmbient{
		Common: RuntimeCommon{
			SamplingRate: 10,
			Seed:         1,
			Packet: PacketConfig{
				MeanSize: 1000,
				MinSize:  1000,
				MaxSize:  1000,
			},
			Protocols: ProtocolMix{UDP: 1},
		},
		Networks: []RuntimeAmbientNetwork{{
			Prefix:        prefix,
			IncomingShare: 0.75,
			OutgoingShare: 0.25,
			RateBPS:       320000,
			Hosts:         1,
			Correlation:   0.9,
			PeerPrefixes:  []netip.Prefix{peer},
		}},
	}
	model, err := NewAmbientModel(cfg)
	if err != nil {
		t.Fatal(err)
	}
	result, err := model.Tick(time.Second, 10)
	if err != nil {
		t.Fatal(err)
	}

	var incoming, outgoing int
	for _, packet := range result.Packets {
		switch packet.Direction {
		case DirectionIncoming:
			incoming++
		case DirectionOutgoing:
			outgoing++
		}
	}
	if incoming != 3 || outgoing != 1 {
		t.Fatalf("generated incoming=%d outgoing=%d, expected 3/1", incoming, outgoing)
	}
	if result.TargetIncomingBPS != 240000 || result.TargetOutgoingBPS != 80000 {
		t.Fatalf("target split=%f/%f, expected 240000/80000", result.TargetIncomingBPS, result.TargetOutgoingBPS)
	}
}