test filter caching

dht_filters_test.go

 package dht
 
 import (
+	"context"
+	"net"
 	"testing"
 
+	ic "github.com/libp2p/go-libp2p-core/crypto"
+	"github.com/libp2p/go-libp2p-core/network"
+	"github.com/libp2p/go-libp2p-core/peer"
 	"github.com/multiformats/go-multiaddr"
+	ma "github.com/multiformats/go-multiaddr"
+	manet "github.com/multiformats/go-multiaddr-net"
 )
 
 func TestIsRelay(t *testing.T) {
@@ -21,3 +28,39 @@ func TestIsRelay(t *testing.T) {
 	}
 
 }
+
+type mockConn struct {
+	local  peer.AddrInfo
+	remote peer.AddrInfo
+}
+
+func (m *mockConn) Close() error                       { return nil }
+func (m *mockConn) NewStream() (network.Stream, error) { return nil, nil }
+func (m *mockConn) GetStreams() []network.Stream       { return []network.Stream{} }
+func (m *mockConn) Stat() network.Stat                 { return network.Stat{Direction: network.DirOutbound} }
+func (m *mockConn) LocalMultiaddr() ma.Multiaddr       { return m.local.Addrs[0] }
+func (m *mockConn) RemoteMultiaddr() ma.Multiaddr      { return m.remote.Addrs[0] }
+func (m *mockConn) LocalPeer() peer.ID                 { return m.local.ID }
+func (m *mockConn) LocalPrivateKey() ic.PrivKey        { return nil }
+func (m *mockConn) RemotePeer() peer.ID                { return m.remote.ID }
+func (m *mockConn) RemotePublicKey() ic.PubKey         { return nil }
+
+func TestFilterCaching(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	d := setupDHT(ctx, t, true)
+
+	remote, _ := manet.FromIP(net.IPv4(8, 8, 8, 8))
+	if PrivateRoutingTableFilter(d, []network.Conn{&mockConn{
+		local:  d.Host().Peerstore().PeerInfo(d.Host().ID()),
+		remote: peer.AddrInfo{ID: "", Addrs: []ma.Multiaddr{remote}},
+	}}) {
+		t.Fatal("filter should prevent public remote peers.")
+	}
+
+	r1 := getCachedRouter()
+	r2 := getCachedRouter()
+	if r1 != r2 {
+		t.Fatal("router should be returned multiple times.")
+	}
+}