Official Go implementation of the Ethereum protocol
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go-ethereum/p2p/enode/localnode_test.go

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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 enode
import (
"math/rand"
"net"
"net/netip"
"testing"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/p2p/enr"
"github.com/ethereum/go-ethereum/p2p/netutil"
"github.com/stretchr/testify/assert"
)
func newLocalNodeForTesting() (*LocalNode, *DB) {
db, _ := OpenDB("")
key, _ := crypto.GenerateKey()
return NewLocalNode(db, key), db
}
func TestLocalNode(t *testing.T) {
ln, db := newLocalNodeForTesting()
defer db.Close()
if ln.Node().ID() != ln.ID() {
t.Fatal("inconsistent ID")
}
ln.Set(enr.WithEntry("x", uint(3)))
var x uint
if err := ln.Node().Load(enr.WithEntry("x", &x)); err != nil {
t.Fatal("can't load entry 'x':", err)
} else if x != 3 {
t.Fatal("wrong value for entry 'x':", x)
}
}
// This test checks that the sequence number is persisted between restarts.
func TestLocalNodeSeqPersist(t *testing.T) {
timestamp := nowMilliseconds()
ln, db := newLocalNodeForTesting()
defer db.Close()
initialSeq := ln.Node().Seq()
if initialSeq < timestamp {
t.Fatalf("wrong initial seq %d, want at least %d", initialSeq, timestamp)
}
ln.Set(enr.WithEntry("x", uint(1)))
if s := ln.Node().Seq(); s != initialSeq+1 {
t.Fatalf("wrong seq %d after set, want %d", s, initialSeq+1)
}
// Create a new instance, it should reload the sequence number.
// The number increases just after that because a new record is
// created without the "x" entry.
ln2 := NewLocalNode(db, ln.key)
if s := ln2.Node().Seq(); s != initialSeq+2 {
t.Fatalf("wrong seq %d on new instance, want %d", s, initialSeq+2)
}
finalSeq := ln2.Node().Seq()
// Create a new instance with a different node key on the same database.
// This should reset the sequence number.
key, _ := crypto.GenerateKey()
ln3 := NewLocalNode(db, key)
if s := ln3.Node().Seq(); s < finalSeq {
t.Fatalf("wrong seq %d on instance with changed key, want >= %d", s, finalSeq)
}
}
// This test checks behavior of the endpoint predictor.
func TestLocalNodeEndpoint(t *testing.T) {
var (
rng = rand.New(rand.NewSource(4))
fallback = &net.UDPAddr{IP: net.IP{127, 0, 0, 1}, Port: 80}
predicted = &net.UDPAddr{IP: net.IP{127, 0, 1, 2}, Port: 81}
staticIP = net.IP{127, 0, 1, 2}
)
ln, db := newLocalNodeForTesting()
defer db.Close()
// Nothing is set initially.
assert.Equal(t, netip.Addr{}, ln.Node().IPAddr())
assert.Equal(t, net.IP(nil), ln.Node().IP())
assert.Equal(t, 0, ln.Node().UDP())
initialSeq := ln.Node().Seq()
// Set up fallback address.
ln.SetFallbackIP(fallback.IP)
ln.SetFallbackUDP(fallback.Port)
assert.Equal(t, netutil.IPToAddr(fallback.IP), ln.Node().IPAddr())
assert.Equal(t, fallback.IP, ln.Node().IP())
assert.Equal(t, fallback.Port, ln.Node().UDP())
assert.Equal(t, initialSeq+1, ln.Node().Seq())
// Add endpoint statements from random hosts.
for i := 0; i < iptrackMinStatements; i++ {
assert.Equal(t, netutil.IPToAddr(fallback.IP), ln.Node().IPAddr())
assert.Equal(t, fallback.IP, ln.Node().IP())
assert.Equal(t, fallback.Port, ln.Node().UDP())
assert.Equal(t, initialSeq+1, ln.Node().Seq())
from := netip.AddrPortFrom(netutil.RandomAddr(rng, true), 9000)
endpoint := netip.AddrPortFrom(netutil.IPToAddr(predicted.IP), uint16(predicted.Port))
ln.UDPEndpointStatement(from, endpoint)
}
assert.Equal(t, netutil.IPToAddr(predicted.IP), ln.Node().IPAddr())
assert.Equal(t, predicted.IP, ln.Node().IP())
assert.Equal(t, predicted.Port, ln.Node().UDP())
assert.Equal(t, initialSeq+2, ln.Node().Seq())
// Static IP overrides prediction.
ln.SetStaticIP(staticIP)
assert.Equal(t, netutil.IPToAddr(staticIP), ln.Node().IPAddr())
assert.Equal(t, staticIP, ln.Node().IP())
assert.Equal(t, fallback.Port, ln.Node().UDP())
assert.Equal(t, initialSeq+3, ln.Node().Seq())
}