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// Copyright 2018 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 netutil
import (
"fmt"
mrand "math/rand"
"testing"
"time"
"github.com/ethereum/go-ethereum/common/mclock"
)
const (
opStatement = iota
opContact
opPredict
opCheckFullCone
)
type iptrackTestEvent struct {
op int
time int // absolute, in milliseconds
ip, from string
}
func TestIPTracker(t *testing.T) {
tests := map[string][]iptrackTestEvent{
"minStatements": {
{opPredict, 0, "", ""},
{opStatement, 0, "127.0.0.1", "127.0.0.2"},
{opPredict, 1000, "", ""},
{opStatement, 1000, "127.0.0.1", "127.0.0.3"},
{opPredict, 1000, "", ""},
{opStatement, 1000, "127.0.0.1", "127.0.0.4"},
{opPredict, 1000, "127.0.0.1", ""},
},
"window": {
{opStatement, 0, "127.0.0.1", "127.0.0.2"},
{opStatement, 2000, "127.0.0.1", "127.0.0.3"},
{opStatement, 3000, "127.0.0.1", "127.0.0.4"},
{opPredict, 10000, "127.0.0.1", ""},
{opPredict, 10001, "", ""}, // first statement expired
{opStatement, 10100, "127.0.0.1", "127.0.0.2"},
{opPredict, 10200, "127.0.0.1", ""},
},
"fullcone": {
{opContact, 0, "", "127.0.0.2"},
{opStatement, 10, "127.0.0.1", "127.0.0.2"},
{opContact, 2000, "", "127.0.0.3"},
{opStatement, 2010, "127.0.0.1", "127.0.0.3"},
{opContact, 3000, "", "127.0.0.4"},
{opStatement, 3010, "127.0.0.1", "127.0.0.4"},
{opCheckFullCone, 3500, "false", ""},
},
"fullcone_2": {
{opContact, 0, "", "127.0.0.2"},
{opStatement, 10, "127.0.0.1", "127.0.0.2"},
{opContact, 2000, "", "127.0.0.3"},
{opStatement, 2010, "127.0.0.1", "127.0.0.3"},
{opStatement, 3000, "127.0.0.1", "127.0.0.4"},
{opContact, 3010, "", "127.0.0.4"},
{opCheckFullCone, 3500, "true", ""},
},
}
for name, test := range tests {
t.Run(name, func(t *testing.T) { runIPTrackerTest(t, test) })
}
}
func runIPTrackerTest(t *testing.T, evs []iptrackTestEvent) {
var (
clock mclock.Simulated
it = NewIPTracker(10*time.Second, 10*time.Second, 3)
)
it.clock = &clock
for i, ev := range evs {
evtime := time.Duration(ev.time) * time.Millisecond
clock.Run(evtime - time.Duration(clock.Now()))
switch ev.op {
case opStatement:
it.AddStatement(ev.from, ev.ip)
case opContact:
it.AddContact(ev.from)
case opPredict:
if pred := it.PredictEndpoint(); pred != ev.ip {
t.Errorf("op %d: wrong prediction %q, want %q", i, pred, ev.ip)
}
case opCheckFullCone:
pred := fmt.Sprintf("%t", it.PredictFullConeNAT())
if pred != ev.ip {
t.Errorf("op %d: wrong prediction %s, want %s", i, pred, ev.ip)
}
}
}
}
// This checks that old statements and contacts are GCed even if Predict* isn't called.
func TestIPTrackerForceGC(t *testing.T) {
var (
clock mclock.Simulated
window = 10 * time.Second
rate = 50 * time.Millisecond
max = int(window/rate) + 1
it = NewIPTracker(window, window, 3)
)
it.clock = &clock
for i := 0; i < 5*max; i++ {
e1 := make([]byte, 4)
e2 := make([]byte, 4)
mrand.Read(e1)
mrand.Read(e2)
it.AddStatement(string(e1), string(e2))
it.AddContact(string(e1))
clock.Run(rate)
}
if len(it.contact) > 2*max {
t.Errorf("contacts not GCed, have %d", len(it.contact))
}
if len(it.statements) > 2*max {
t.Errorf("statements not GCed, have %d", len(it.statements))
}
}
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