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rt_diversity_filter_test.go
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package dht
import (
"context"
"crypto/rand"
"testing"
"time"
kb "github.com/libp2p/go-libp2p-kbucket"
"github.com/libp2p/go-libp2p-kbucket/peerdiversity"
"github.com/libp2p/go-libp2p/core/crypto"
"github.com/libp2p/go-libp2p/core/peer"
bhost "github.com/libp2p/go-libp2p/p2p/host/basic"
swarmt "github.com/libp2p/go-libp2p/p2p/net/swarm/testing"
ma "github.com/multiformats/go-multiaddr"
"github.com/stretchr/testify/require"
)
func TestRTPeerDiversityFilter(t *testing.T) {
h, err := bhost.NewHost(swarmt.GenSwarm(t, swarmt.OptDisableReuseport), new(bhost.HostOpts))
require.NoError(t, err)
h.Start()
defer h.Close()
r := NewRTPeerDiversityFilter(h, 2, 3)
// table should only have 2 for each prefix per cpl
key := "key"
g := peerdiversity.PeerGroupInfo{Cpl: 1, IPGroupKey: peerdiversity.PeerIPGroupKey(key)}
require.True(t, r.Allow(g))
r.Increment(g)
require.True(t, r.Allow(g))
r.Increment(g)
require.False(t, r.Allow(g))
// table should ONLY have 3 for a Prefix
key = "random"
g2 := peerdiversity.PeerGroupInfo{Cpl: 2, IPGroupKey: peerdiversity.PeerIPGroupKey(key)}
require.True(t, r.Allow(g2))
r.Increment(g2)
g2.Cpl = 3
require.True(t, r.Allow(g2))
r.Increment(g2)
g2.Cpl = 4
require.True(t, r.Allow(g2))
r.Increment(g2)
require.False(t, r.Allow(g2))
// remove a peer with a prefix and it works
r.Decrement(g2)
require.True(t, r.Allow(g2))
r.Increment(g2)
// and then it doesn't work again
require.False(t, r.Allow(g2))
}
func TestRoutingTableEndToEndMaxPerCpl(t *testing.T) {
ctx := context.Background()
h, err := bhost.NewHost(swarmt.GenSwarm(t, swarmt.OptDisableReuseport), new(bhost.HostOpts))
require.NoError(t, err)
h.Start()
defer h.Close()
r := NewRTPeerDiversityFilter(h, 1, 2)
d, err := New(
ctx,
h,
testPrefix,
NamespacedValidator("v", blankValidator{}),
Mode(ModeServer),
DisableAutoRefresh(),
RoutingTablePeerDiversityFilter(r),
)
require.NoError(t, err)
defer d.Close()
var d2 *IpfsDHT
var d3 *IpfsDHT
for {
d2 = setupDHT(ctx, t, false)
if kb.CommonPrefixLen(d.selfKey, kb.ConvertPeerID(d2.self)) == 1 {
break
}
}
for {
d3 = setupDHT(ctx, t, false)
if kb.CommonPrefixLen(d.selfKey, kb.ConvertPeerID(d3.self)) == 1 {
break
}
}
// d2 will be allowed in the Routing table but
// d3 will not be allowed.
connectNoSync(t, ctx, d, d2)
require.Eventually(t, func() bool {
return d.routingTable.Find(d2.self) != ""
}, 1*time.Second, 100*time.Millisecond)
connectNoSync(t, ctx, d, d3)
time.Sleep(1 * time.Second)
require.Len(t, d.routingTable.ListPeers(), 1)
require.True(t, d.routingTable.Find(d3.self) == "")
// it works after removing d2
d.routingTable.RemovePeer(d2.self)
b, err := d.routingTable.TryAddPeer(d3.self, true, false)
require.NoError(t, err)
require.True(t, b)
require.Len(t, d.routingTable.ListPeers(), 1)
require.True(t, d.routingTable.Find(d3.self) != "")
}
func TestRoutingTableEndToEndMaxPerTable(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
h, err := bhost.NewHost(swarmt.GenSwarm(t, swarmt.OptDisableReuseport), new(bhost.HostOpts))
require.NoError(t, err)
h.Start()
defer h.Close()
r := NewRTPeerDiversityFilter(h, 100, 3)
d, err := New(
ctx,
h,
testPrefix,
NamespacedValidator("v", blankValidator{}),
Mode(ModeServer),
DisableAutoRefresh(),
RoutingTablePeerDiversityFilter(r),
)
require.NoError(t, err)
defer d.Close()
// only 3 peers per prefix for the table.
d2 := setupDHT(ctx, t, false, DisableAutoRefresh())
connect(t, ctx, d, d2)
waitForWellFormedTables(t, []*IpfsDHT{d}, 1, 1, 1*time.Second)
d3 := setupDHT(ctx, t, false, DisableAutoRefresh())
connect(t, ctx, d, d3)
waitForWellFormedTables(t, []*IpfsDHT{d}, 2, 2, 1*time.Second)
d4 := setupDHT(ctx, t, false, DisableAutoRefresh())
connect(t, ctx, d, d4)
waitForWellFormedTables(t, []*IpfsDHT{d}, 3, 3, 1*time.Second)
d5 := setupDHT(ctx, t, false, DisableAutoRefresh())
connectNoSync(t, ctx, d, d5)
time.Sleep(1 * time.Second)
require.Len(t, d.routingTable.ListPeers(), 3)
require.True(t, d.routingTable.Find(d5.self) == "")
}
func TestFilterPeersByIPDiversity(t *testing.T) {
maxIPsPerGroup := 2
type addr struct {
ipv6 bool
addr string
}
createPeer := func(ips ...addr) *peer.AddrInfo {
_, pubKey, err := crypto.GenerateEd25519Key(rand.Reader)
require.NoError(t, err)
pid, err := peer.IDFromPublicKey(pubKey)
require.NoError(t, err)
p := &peer.AddrInfo{ID: pid, Addrs: make([]ma.Multiaddr, 0, len(ips))}
for _, ip := range ips {
var a ma.Multiaddr
var err error
if ip.ipv6 {
a, err = ma.NewMultiaddr("/ip6/" + ip.addr + "/tcp/4001")
} else {
a, err = ma.NewMultiaddr("/ip4/" + ip.addr + "/tcp/4001")
}
require.NoError(t, err)
p.Addrs = append(p.Addrs, a)
}
return p
}
t.Run("Different IPv4 blocks", func(t *testing.T) {
peers := []*peer.AddrInfo{
createPeer(addr{ipv6: false, addr: "1.1.1.1"}),
createPeer(addr{ipv6: false, addr: "2.2.2.2"}),
createPeer(addr{ipv6: false, addr: "3.3.3.3"}),
createPeer(addr{ipv6: false, addr: "4.4.4.4"}),
}
filtered := filterPeersByIPDiversity(peers, maxIPsPerGroup)
require.Equal(t, peers, filtered)
})
t.Run("Same IPv4 block, but acceptable diversity", func(t *testing.T) {
peers := []*peer.AddrInfo{
createPeer(addr{ipv6: false, addr: "1.1.1.1"}),
createPeer(addr{ipv6: false, addr: "1.1.2.2"}),
createPeer(addr{ipv6: false, addr: "3.3.3.3"}),
createPeer(addr{ipv6: false, addr: "4.4.4.4"}),
}
filtered := filterPeersByIPDiversity(peers, maxIPsPerGroup)
require.Equal(t, peers, filtered)
})
t.Run("Overrepresented IPv4 block", func(t *testing.T) {
peers := []*peer.AddrInfo{
createPeer(addr{ipv6: false, addr: "1.1.1.1"}),
createPeer(addr{ipv6: false, addr: "1.1.1.2"}),
createPeer(addr{ipv6: false, addr: "1.1.3.3"}),
createPeer(addr{ipv6: false, addr: "4.4.4.4"}),
}
filtered := filterPeersByIPDiversity(peers, maxIPsPerGroup)
require.Len(t, filtered, 1)
require.Equal(t, peers[3], filtered[0])
})
t.Run("Different IPv6 ASNs", func(t *testing.T) {
peers := []*peer.AddrInfo{
createPeer(addr{ipv6: true, addr: "2001:4860:4860::1"}),
createPeer(addr{ipv6: true, addr: "2606:4700:4700::2"}),
createPeer(addr{ipv6: true, addr: "2620:fe::3"}),
createPeer(addr{ipv6: true, addr: "2a02:6b8::4"}),
}
filtered := filterPeersByIPDiversity(peers, maxIPsPerGroup)
require.Equal(t, filtered, peers)
})
t.Run("Same IPv6 ASNs, but acceptable diversity", func(t *testing.T) {
peers := []*peer.AddrInfo{
createPeer(addr{ipv6: true, addr: "2001:4860:4860::1"}),
createPeer(addr{ipv6: true, addr: "2001:4860:4860::2"}),
createPeer(addr{ipv6: true, addr: "2620:fe::3"}),
createPeer(addr{ipv6: true, addr: "2a02:6b8::4"}),
}
filtered := filterPeersByIPDiversity(peers, maxIPsPerGroup)
require.Equal(t, filtered, peers)
})
t.Run("Overrepresented IPv6 ASN", func(t *testing.T) {
peers := []*peer.AddrInfo{
createPeer(addr{ipv6: true, addr: "2001:4860:4860::1"}),
createPeer(addr{ipv6: true, addr: "2001:4860:4860::2"}),
createPeer(addr{ipv6: true, addr: "2001:4860:4860::3"}),
createPeer(addr{ipv6: true, addr: "2a02:6b8::4"}),
}
filtered := filterPeersByIPDiversity(peers, maxIPsPerGroup)
require.Len(t, filtered, 1)
require.Equal(t, peers[3], filtered[0])
})
t.Run("IPv4+IPv6 acceptable representation", func(t *testing.T) {
peers := []*peer.AddrInfo{
createPeer(addr{ipv6: false, addr: "1.1.1.1"}, addr{ipv6: true, addr: "2001:4860:4860::1"}),
createPeer(addr{ipv6: false, addr: "2.2.2.2"}, addr{ipv6: true, addr: "2001:4860:4860::2"}),
createPeer(addr{ipv6: false, addr: "2.2.3.3"}, addr{ipv6: true, addr: "2620:fe::3"}),
createPeer(addr{ipv6: false, addr: "4.4.4.4"}, addr{ipv6: true, addr: "2a02:6b8::4"}),
}
filtered := filterPeersByIPDiversity(peers, maxIPsPerGroup)
require.Equal(t, filtered, peers)
})
t.Run("IPv4+IPv6 overrepresentation", func(t *testing.T) {
peers := []*peer.AddrInfo{
createPeer(addr{ipv6: false, addr: "1.1.1.1"}, addr{ipv6: true, addr: "2001:4860:4860::1"}),
createPeer(addr{ipv6: false, addr: "1.1.1.2"}, addr{ipv6: true, addr: "2606:4700:4700::2"}),
createPeer(addr{ipv6: false, addr: "1.1.3.3"}, addr{ipv6: true, addr: "2620:fe::3"}),
createPeer(addr{ipv6: false, addr: "4.4.4.4"}, addr{ipv6: true, addr: "2620:fe::4"}),
}
filtered := filterPeersByIPDiversity(peers, maxIPsPerGroup)
require.Len(t, filtered, 1)
require.Equal(t, peers[3], filtered[0])
})
t.Run("Disabled IP diversity filter", func(t *testing.T) {
peers := []*peer.AddrInfo{
createPeer(addr{ipv6: false, addr: "1.1.1.1"}),
createPeer(addr{ipv6: false, addr: "1.1.1.2"}),
createPeer(addr{ipv6: false, addr: "1.1.3.3"}),
createPeer(addr{ipv6: false, addr: "1.1.4.4"}),
}
filtered := filterPeersByIPDiversity(peers, 0)
require.Equal(t, filtered, peers)
})
}