watchtower/server/server_test: add test vectors for server behavior
This commit is contained in:
Conner Fromknecht
Conner Fromknecht
parent
db4c4488c5
commit
712e7f08f0
634
watchtower/server/server_test.go
Normal file
634
watchtower/server/server_test.go
Normal file
@ -0,0 +1,634 @@
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// +build dev
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package server_test
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import (
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"bytes"
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"reflect"
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"testing"
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"time"
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"github.com/btcsuite/btcd/btcec"
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/btcsuite/btcutil"
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"github.com/lightningnetwork/lnd/lnwire"
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"github.com/lightningnetwork/lnd/watchtower/server"
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"github.com/lightningnetwork/lnd/watchtower/wtdb"
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"github.com/lightningnetwork/lnd/watchtower/wtwire"
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)
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// addr is the server's reward address given to watchtower clients.
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var addr, _ = btcutil.DecodeAddress(
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"mrX9vMRYLfVy1BnZbc5gZjuyaqH3ZW2ZHz", &chaincfg.TestNet3Params,
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)
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// randPubKey generates a new secp keypair, and returns the public key.
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func randPubKey(t *testing.T) *btcec.PublicKey {
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t.Helper()
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sk, err := btcec.NewPrivateKey(btcec.S256())
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if err != nil {
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t.Fatalf("unable to generate pubkey: %v", err)
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}
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return sk.PubKey()
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}
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// initServer creates and starts a new server using the server.DB and timeout.
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// If the provided database is nil, a mock db will be used.
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func initServer(t *testing.T, db server.DB,
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timeout time.Duration) server.Interface {
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t.Helper()
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if db == nil {
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db = wtdb.NewMockDB()
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}
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s, err := server.New(&server.Config{
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DB: db,
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ReadTimeout: timeout,
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WriteTimeout: timeout,
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NewAddress: func() (btcutil.Address, error) {
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return addr, nil
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},
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})
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if err != nil {
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t.Fatalf("unable to create server: %v", err)
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}
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if err = s.Start(); err != nil {
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t.Fatalf("unable to start server: %v", err)
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}
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return s
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}
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// TestServerOnlyAcceptOnePeer checks that the server will reject duplicate
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// peers with the same session id by disconnecting them. This is accomplished by
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// connecting two distinct peers with the same session id, and trying to send
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// messages on both connections. Since one should be rejected, we verify that
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// only one of the connections is able to send messages.
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func TestServerOnlyAcceptOnePeer(t *testing.T) {
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t.Parallel()
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const timeoutDuration = 500 * time.Millisecond
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s := initServer(t, nil, timeoutDuration)
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defer s.Stop()
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// Create two peers using the same session id.
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peerPub := randPubKey(t)
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peer1 := server.NewMockPeer(peerPub, nil, 0)
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peer2 := server.NewMockPeer(peerPub, nil, 0)
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// Serialize a Init message to be sent by both peers.
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init := wtwire.NewInitMessage(
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lnwire.NewRawFeatureVector(), lnwire.NewRawFeatureVector(),
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)
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var b bytes.Buffer
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_, err := wtwire.WriteMessage(&b, init, 0)
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if err != nil {
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t.Fatalf("unable to write message: %v", err)
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}
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msg := b.Bytes()
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// Connect both peers to the server simultaneously.
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s.InboundPeerConnected(peer1)
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s.InboundPeerConnected(peer2)
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// Use a timeout of twice the server's timeouts, to ensure the server
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// has time to process the messages.
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timeout := time.After(2 * timeoutDuration)
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// Try to send a message on either peer, and record the opposite peer as
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// the one we assume to be rejected.
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var (
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rejectedPeer *server.MockPeer
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acceptedPeer *server.MockPeer
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)
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select {
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case peer1.IncomingMsgs <- msg:
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acceptedPeer = peer1
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rejectedPeer = peer2
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case peer2.IncomingMsgs <- msg:
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acceptedPeer = peer2
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rejectedPeer = peer1
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case <-timeout:
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t.Fatalf("unable to send message via either peer")
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}
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// Try again to send a message, this time only via the assumed-rejected
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// peer. We expect our conservative timeout to expire, as the server
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// isn't reading from this peer. Before the timeout, the accepted peer
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// should also receive a reply to its Init message.
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select {
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case <-acceptedPeer.OutgoingMsgs:
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select {
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case rejectedPeer.IncomingMsgs <- msg:
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t.Fatalf("rejected peer should not have received message")
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case <-timeout:
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// Accepted peer got reply, rejected peer go nothing.
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}
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case rejectedPeer.IncomingMsgs <- msg:
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t.Fatalf("rejected peer should not have received message")
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case <-timeout:
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t.Fatalf("accepted peer should have received init message")
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}
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}
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type createSessionTestCase struct {
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name string
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initMsg *wtwire.Init
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createMsg *wtwire.CreateSession
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expReply *wtwire.CreateSessionReply
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expDupReply *wtwire.CreateSessionReply
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}
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var createSessionTests = []createSessionTestCase{
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{
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name: "reject duplicate session create",
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initMsg: wtwire.NewInitMessage(
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lnwire.NewRawFeatureVector(),
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lnwire.NewRawFeatureVector(),
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),
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createMsg: &wtwire.CreateSession{
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BlobVersion: 0,
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MaxUpdates: 1000,
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RewardRate: 0,
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SweepFeeRate: 1,
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},
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expReply: &wtwire.CreateSessionReply{
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Code: wtwire.CodeOK,
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Data: []byte(addr.ScriptAddress()),
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},
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expDupReply: &wtwire.CreateSessionReply{
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Code: wtwire.CreateSessionCodeAlreadyExists,
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Data: []byte(addr.ScriptAddress()),
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},
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},
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// TODO(conner): add policy rejection tests
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}
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// TestServerCreateSession checks the server's behavior in response to a
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// table-driven set of CreateSession messages.
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func TestServerCreateSession(t *testing.T) {
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t.Parallel()
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for i, test := range createSessionTests {
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t.Run(test.name, func(t *testing.T) {
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testServerCreateSession(t, i, test)
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})
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}
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}
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func testServerCreateSession(t *testing.T, i int, test createSessionTestCase) {
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const timeoutDuration = 500 * time.Millisecond
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s := initServer(t, nil, timeoutDuration)
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defer s.Stop()
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// Create a new client and connect to server.
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peerPub := randPubKey(t)
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peer := server.NewMockPeer(peerPub, nil, 0)
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connect(t, i, s, peer, test.initMsg, timeoutDuration)
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// Send the CreateSession message, and wait for a reply.
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sendMsg(t, i, test.createMsg, peer, timeoutDuration)
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reply := recvReply(
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t, i, "CreateSessionReply", peer, timeoutDuration,
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).(*wtwire.CreateSessionReply)
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// Verify that the server's response matches our expectation.
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if !reflect.DeepEqual(reply, test.expReply) {
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t.Fatalf("[test %d] expected reply %v, got %d",
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i, test.expReply, reply)
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}
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// Assert that the server closes the connection after processing the
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// CreateSession.
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assertConnClosed(t, peer, 2*timeoutDuration)
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// If this test did not request sending a duplicate CreateSession, we can
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// continue to the next test.
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if test.expDupReply == nil {
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return
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}
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// Simulate a peer with the same session id connection to the server
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// again.
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peer = server.NewMockPeer(peerPub, nil, 0)
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connect(t, i, s, peer, test.initMsg, timeoutDuration)
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// Send the _same_ CreateSession message as the first attempt.
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sendMsg(t, i, test.createMsg, peer, timeoutDuration)
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reply = recvReply(
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t, i, "CreateSessionReply", peer, timeoutDuration,
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).(*wtwire.CreateSessionReply)
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// Ensure that the server's reply matches our expected response for a
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// duplicate send.
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if !reflect.DeepEqual(reply, test.expDupReply) {
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t.Fatalf("[test %d] expected reply %v, got %d",
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i, test.expReply, reply)
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}
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// Finally, check that the server tore down the connection.
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assertConnClosed(t, peer, 2*timeoutDuration)
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}
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type stateUpdateTestCase struct {
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name string
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initMsg *wtwire.Init
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createMsg *wtwire.CreateSession
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updates []*wtwire.StateUpdate
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replies []*wtwire.StateUpdateReply
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}
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var stateUpdateTests = []stateUpdateTestCase{
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// Valid update sequence, send seqnum == lastapplied as last update.
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{
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name: "perm fail after sending seqnum equal lastapplied",
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initMsg: &wtwire.Init{&lnwire.Init{
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LocalFeatures: lnwire.NewRawFeatureVector(),
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GlobalFeatures: lnwire.NewRawFeatureVector(),
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}},
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createMsg: &wtwire.CreateSession{
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BlobVersion: 0,
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MaxUpdates: 3,
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RewardRate: 0,
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SweepFeeRate: 1,
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},
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updates: []*wtwire.StateUpdate{
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{SeqNum: 1, LastApplied: 0},
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{SeqNum: 2, LastApplied: 1},
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{SeqNum: 3, LastApplied: 2},
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{SeqNum: 3, LastApplied: 3},
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},
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replies: []*wtwire.StateUpdateReply{
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{Code: wtwire.CodeOK, LastApplied: 1},
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{Code: wtwire.CodeOK, LastApplied: 2},
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{Code: wtwire.CodeOK, LastApplied: 3},
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{
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Code: wtwire.CodePermanentFailure,
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LastApplied: 3,
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},
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},
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},
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// Send update that skips next expected sequence number.
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{
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name: "skip sequence number",
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initMsg: &wtwire.Init{&lnwire.Init{
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LocalFeatures: lnwire.NewRawFeatureVector(),
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GlobalFeatures: lnwire.NewRawFeatureVector(),
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}},
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createMsg: &wtwire.CreateSession{
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BlobVersion: 0,
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MaxUpdates: 4,
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RewardRate: 0,
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SweepFeeRate: 1,
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},
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updates: []*wtwire.StateUpdate{
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{SeqNum: 2, LastApplied: 0},
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},
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replies: []*wtwire.StateUpdateReply{
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{
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Code: wtwire.StateUpdateCodeSeqNumOutOfOrder,
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LastApplied: 0,
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},
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},
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},
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// Send update that reverts to older sequence number.
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{
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name: "revert to older seqnum",
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initMsg: &wtwire.Init{&lnwire.Init{
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LocalFeatures: lnwire.NewRawFeatureVector(),
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GlobalFeatures: lnwire.NewRawFeatureVector(),
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}},
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createMsg: &wtwire.CreateSession{
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BlobVersion: 0,
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MaxUpdates: 4,
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RewardRate: 0,
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SweepFeeRate: 1,
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},
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updates: []*wtwire.StateUpdate{
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{SeqNum: 1, LastApplied: 0},
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{SeqNum: 2, LastApplied: 0},
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{SeqNum: 1, LastApplied: 0},
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},
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replies: []*wtwire.StateUpdateReply{
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{Code: wtwire.CodeOK, LastApplied: 1},
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{Code: wtwire.CodeOK, LastApplied: 2},
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{
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Code: wtwire.StateUpdateCodeSeqNumOutOfOrder,
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LastApplied: 2,
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},
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},
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},
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// Send update echoing a last applied that is lower than previous value.
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{
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name: "revert to older lastapplied",
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initMsg: &wtwire.Init{&lnwire.Init{
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LocalFeatures: lnwire.NewRawFeatureVector(),
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GlobalFeatures: lnwire.NewRawFeatureVector(),
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}},
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createMsg: &wtwire.CreateSession{
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BlobVersion: 0,
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MaxUpdates: 4,
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RewardRate: 0,
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SweepFeeRate: 1,
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},
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updates: []*wtwire.StateUpdate{
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{SeqNum: 1, LastApplied: 0},
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{SeqNum: 2, LastApplied: 1},
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{SeqNum: 3, LastApplied: 2},
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{SeqNum: 4, LastApplied: 1},
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},
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replies: []*wtwire.StateUpdateReply{
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{Code: wtwire.CodeOK, LastApplied: 1},
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{Code: wtwire.CodeOK, LastApplied: 2},
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{Code: wtwire.CodeOK, LastApplied: 3},
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{Code: wtwire.StateUpdateCodeClientBehind, LastApplied: 3},
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},
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},
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// Valid update sequence with disconnection, ensure resumes resume.
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// Client echos last applied as they are received.
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{
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name: "resume after disconnect",
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initMsg: &wtwire.Init{&lnwire.Init{
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LocalFeatures: lnwire.NewRawFeatureVector(),
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GlobalFeatures: lnwire.NewRawFeatureVector(),
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}},
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createMsg: &wtwire.CreateSession{
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BlobVersion: 0,
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MaxUpdates: 4,
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RewardRate: 0,
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SweepFeeRate: 1,
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},
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updates: []*wtwire.StateUpdate{
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{SeqNum: 1, LastApplied: 0},
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{SeqNum: 2, LastApplied: 1},
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nil, // Wait for read timeout to drop conn, then reconnect.
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{SeqNum: 3, LastApplied: 2},
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{SeqNum: 4, LastApplied: 3},
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},
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replies: []*wtwire.StateUpdateReply{
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{Code: wtwire.CodeOK, LastApplied: 1},
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{Code: wtwire.CodeOK, LastApplied: 2},
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nil,
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{Code: wtwire.CodeOK, LastApplied: 3},
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{Code: wtwire.CodeOK, LastApplied: 4},
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},
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},
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// Valid update sequence with disconnection, ensure resumes resume.
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// Client doesn't echo last applied until last message.
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{
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name: "resume after disconnect lagging lastapplied",
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initMsg: &wtwire.Init{&lnwire.Init{
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LocalFeatures: lnwire.NewRawFeatureVector(),
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GlobalFeatures: lnwire.NewRawFeatureVector(),
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}},
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createMsg: &wtwire.CreateSession{
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BlobVersion: 0,
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MaxUpdates: 4,
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RewardRate: 0,
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SweepFeeRate: 1,
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},
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updates: []*wtwire.StateUpdate{
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{SeqNum: 1, LastApplied: 0},
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{SeqNum: 2, LastApplied: 0},
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nil, // Wait for read timeout to drop conn, then reconnect.
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{SeqNum: 3, LastApplied: 0},
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{SeqNum: 4, LastApplied: 3},
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},
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replies: []*wtwire.StateUpdateReply{
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{Code: wtwire.CodeOK, LastApplied: 1},
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{Code: wtwire.CodeOK, LastApplied: 2},
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nil,
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{Code: wtwire.CodeOK, LastApplied: 3},
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{Code: wtwire.CodeOK, LastApplied: 4},
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},
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},
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// Send update with sequence number that exceeds MaxUpdates.
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{
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name: "seqnum exceed maxupdates",
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initMsg: &wtwire.Init{&lnwire.Init{
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LocalFeatures: lnwire.NewRawFeatureVector(),
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GlobalFeatures: lnwire.NewRawFeatureVector(),
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}},
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createMsg: &wtwire.CreateSession{
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BlobVersion: 0,
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MaxUpdates: 3,
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RewardRate: 0,
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SweepFeeRate: 1,
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},
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updates: []*wtwire.StateUpdate{
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{SeqNum: 1, LastApplied: 0},
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{SeqNum: 2, LastApplied: 1},
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{SeqNum: 3, LastApplied: 2},
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{SeqNum: 4, LastApplied: 3},
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},
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replies: []*wtwire.StateUpdateReply{
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{Code: wtwire.CodeOK, LastApplied: 1},
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{Code: wtwire.CodeOK, LastApplied: 2},
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{Code: wtwire.CodeOK, LastApplied: 3},
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{
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Code: wtwire.StateUpdateCodeMaxUpdatesExceeded,
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LastApplied: 3,
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},
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},
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},
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// Ensure sequence number 0 causes permanent failure.
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{
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name: "perm fail after seqnum 0",
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initMsg: &wtwire.Init{&lnwire.Init{
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LocalFeatures: lnwire.NewRawFeatureVector(),
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GlobalFeatures: lnwire.NewRawFeatureVector(),
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}},
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createMsg: &wtwire.CreateSession{
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BlobVersion: 0,
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MaxUpdates: 3,
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RewardRate: 0,
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SweepFeeRate: 1,
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},
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updates: []*wtwire.StateUpdate{
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{SeqNum: 0, LastApplied: 0},
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},
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replies: []*wtwire.StateUpdateReply{
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{
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Code: wtwire.CodePermanentFailure,
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LastApplied: 0,
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},
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},
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},
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}
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// TestServerStateUpdates tests the behavior of the server in response to
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// watchtower clients sending StateUpdate messages, after having already
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// established an open session. The test asserts that the server responds
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// with the appropriate failure codes in a number of failure conditions where
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// the server and client desynchronize. It also checks the ability of the client
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// to disconnect, connect, and continue updating from the last successful state
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// update.
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func TestServerStateUpdates(t *testing.T) {
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t.Parallel()
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for i, test := range stateUpdateTests {
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t.Run(test.name, func(t *testing.T) {
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testServerStateUpdates(t, i, test)
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func testServerStateUpdates(t *testing.T, i int, test stateUpdateTestCase) {
|
||||
const timeoutDuration = 100 * time.Millisecond
|
||||
|
||||
s := initServer(t, nil, timeoutDuration)
|
||||
defer s.Stop()
|
||||
|
||||
// Create a new client and connect to the server.
|
||||
peerPub := randPubKey(t)
|
||||
peer := server.NewMockPeer(peerPub, nil, 0)
|
||||
connect(t, i, s, peer, test.initMsg, timeoutDuration)
|
||||
|
||||
// Register a session for this client to use in the subsequent tests.
|
||||
sendMsg(t, i, test.createMsg, peer, timeoutDuration)
|
||||
initReply := recvReply(
|
||||
t, i, "CreateSessionReply", peer, timeoutDuration,
|
||||
).(*wtwire.CreateSessionReply)
|
||||
|
||||
// Fail if the server rejected our proposed CreateSession message.
|
||||
if initReply.Code != wtwire.CodeOK {
|
||||
t.Fatalf("[test %d] server rejected session init", i)
|
||||
}
|
||||
|
||||
// Check that the server closed the connection used to register the
|
||||
// session.
|
||||
assertConnClosed(t, peer, 2*timeoutDuration)
|
||||
|
||||
// Now that the original connection has been closed, connect a new
|
||||
// client with the same session id.
|
||||
peer = server.NewMockPeer(peerPub, nil, 0)
|
||||
connect(t, i, s, peer, test.initMsg, timeoutDuration)
|
||||
|
||||
// Send the intended StateUpdate messages in series.
|
||||
for j, update := range test.updates {
|
||||
// A nil update signals that we should wait for the prior
|
||||
// connection to die, before re-register with the same session
|
||||
// identifier.
|
||||
if update == nil {
|
||||
assertConnClosed(t, peer, 2*timeoutDuration)
|
||||
|
||||
peer = server.NewMockPeer(peerPub, nil, 0)
|
||||
connect(t, i, s, peer, test.initMsg, timeoutDuration)
|
||||
|
||||
continue
|
||||
}
|
||||
|
||||
// Send the state update and verify it against our expected
|
||||
// response.
|
||||
sendMsg(t, i, update, peer, timeoutDuration)
|
||||
reply := recvReply(
|
||||
t, i, "StateUpdateReply", peer, timeoutDuration,
|
||||
).(*wtwire.StateUpdateReply)
|
||||
|
||||
if !reflect.DeepEqual(reply, test.replies[j]) {
|
||||
t.Fatalf("[test %d, update %d] expected reply "+
|
||||
"%v, got %d", i, j,
|
||||
test.replies[j], reply)
|
||||
}
|
||||
}
|
||||
|
||||
// Check that the final connection is properly cleaned up by the server.
|
||||
assertConnClosed(t, peer, 2*timeoutDuration)
|
||||
}
|
||||
|
||||
func connect(t *testing.T, i int, s server.Interface, peer *server.MockPeer,
|
||||
initMsg *wtwire.Init, timeout time.Duration) {
|
||||
|
||||
s.InboundPeerConnected(peer)
|
||||
sendMsg(t, i, initMsg, peer, timeout)
|
||||
recvReply(t, i, "Init", peer, timeout)
|
||||
}
|
||||
|
||||
// sendMsg sends a wtwire.Message message via a server.MockPeer.
|
||||
func sendMsg(t *testing.T, i int, msg wtwire.Message,
|
||||
peer *server.MockPeer, timeout time.Duration) {
|
||||
|
||||
t.Helper()
|
||||
|
||||
var b bytes.Buffer
|
||||
_, err := wtwire.WriteMessage(&b, msg, 0)
|
||||
if err != nil {
|
||||
t.Fatalf("[test %d] unable to encode %T message: %v",
|
||||
i, msg, err)
|
||||
}
|
||||
|
||||
select {
|
||||
case peer.IncomingMsgs <- b.Bytes():
|
||||
case <-time.After(2 * timeout):
|
||||
t.Fatalf("[test %d] unable to send %T message", i, msg)
|
||||
}
|
||||
}
|
||||
|
||||
// recvReply receives a message from the server, and parses it according to
|
||||
// expected reply type. The supported replies are CreateSessionReply and
|
||||
// StateUpdateReply.
|
||||
func recvReply(t *testing.T, i int, name string,
|
||||
peer *server.MockPeer, timeout time.Duration) wtwire.Message {
|
||||
|
||||
t.Helper()
|
||||
|
||||
var (
|
||||
msg wtwire.Message
|
||||
err error
|
||||
)
|
||||
|
||||
select {
|
||||
case b := <-peer.OutgoingMsgs:
|
||||
msg, err = wtwire.ReadMessage(bytes.NewReader(b), 0)
|
||||
if err != nil {
|
||||
t.Fatalf("[test %d] unable to decode server "+
|
||||
"reply: %v", i, err)
|
||||
}
|
||||
|
||||
case <-time.After(2 * timeout):
|
||||
t.Fatalf("[test %d] server did not reply", i)
|
||||
}
|
||||
|
||||
switch name {
|
||||
case "Init":
|
||||
if _, ok := msg.(*wtwire.Init); !ok {
|
||||
t.Fatalf("[test %d] expected %s reply "+
|
||||
"message, got %T", i, name, msg)
|
||||
}
|
||||
case "CreateSessionReply":
|
||||
if _, ok := msg.(*wtwire.CreateSessionReply); !ok {
|
||||
t.Fatalf("[test %d] expected %s reply "+
|
||||
"message, got %T", i, name, msg)
|
||||
}
|
||||
case "StateUpdateReply":
|
||||
if _, ok := msg.(*wtwire.StateUpdateReply); !ok {
|
||||
t.Fatalf("[test %d] expected %s reply "+
|
||||
"message, got %T", i, name, msg)
|
||||
}
|
||||
}
|
||||
|
||||
return msg
|
||||
}
|
||||
|
||||
// assertConnClosed checks that the peer's connection is closed before the
|
||||
// timeout expires.
|
||||
func assertConnClosed(t *testing.T, peer *server.MockPeer, duration time.Duration) {
|
||||
t.Helper()
|
||||
|
||||
select {
|
||||
case <-peer.Quit:
|
||||
case <-time.After(duration):
|
||||
t.Fatalf("expected connection to be closed")
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user