mirror of
https://github.com/lightningnetwork/lnd.git
synced 2024-11-19 18:10:34 +01:00
30f61b7630
In this commit, we modify the WitnessCache's AddPreimage method to accept a variadic number of preimages. This enables callers to batch preimage writes in performance critical areas of the codebase, e.g. the htlcswitch. Additionally, we lift the computation of the witnesses' keys outside of the db transaction. This saves us from having to do hashing inside and blocking other callers, and limits extraneous blocking at the call site.
861 lines
19 KiB
Go
861 lines
19 KiB
Go
package htlcswitch
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import (
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"bytes"
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"crypto/sha256"
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"encoding/binary"
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"sync"
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"sync/atomic"
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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/chainhash"
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"github.com/btcsuite/btcd/txscript"
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"github.com/btcsuite/btcd/wire"
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"github.com/go-errors/errors"
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sphinx "github.com/lightningnetwork/lightning-onion"
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"github.com/lightningnetwork/lnd/chainntnfs"
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"github.com/lightningnetwork/lnd/channeldb"
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"github.com/lightningnetwork/lnd/contractcourt"
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"github.com/lightningnetwork/lnd/input"
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"github.com/lightningnetwork/lnd/lnpeer"
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"github.com/lightningnetwork/lnd/lntypes"
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"github.com/lightningnetwork/lnd/lnwallet"
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"github.com/lightningnetwork/lnd/lnwire"
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"github.com/lightningnetwork/lnd/ticker"
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)
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type mockPreimageCache struct {
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sync.Mutex
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preimageMap map[[32]byte][]byte
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}
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func (m *mockPreimageCache) LookupPreimage(hash []byte) ([]byte, bool) {
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m.Lock()
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defer m.Unlock()
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var h [32]byte
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copy(h[:], hash)
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p, ok := m.preimageMap[h]
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return p, ok
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}
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func (m *mockPreimageCache) AddPreimages(preimages ...[]byte) error {
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m.Lock()
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defer m.Unlock()
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for _, preimage := range preimages {
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m.preimageMap[sha256.Sum256(preimage)] = preimage
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}
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return nil
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}
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func (m *mockPreimageCache) SubscribeUpdates() *contractcourt.WitnessSubscription {
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return nil
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}
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type mockFeeEstimator struct {
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byteFeeIn chan lnwallet.SatPerKWeight
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quit chan struct{}
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}
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func (m *mockFeeEstimator) EstimateFeePerKW(
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numBlocks uint32) (lnwallet.SatPerKWeight, error) {
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select {
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case feeRate := <-m.byteFeeIn:
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return feeRate, nil
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case <-m.quit:
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return 0, fmt.Errorf("exiting")
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}
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}
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func (m *mockFeeEstimator) RelayFeePerKW() lnwallet.SatPerKWeight {
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return 1e3
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}
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func (m *mockFeeEstimator) Start() error {
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return nil
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}
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func (m *mockFeeEstimator) Stop() error {
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close(m.quit)
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return nil
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}
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var _ lnwallet.FeeEstimator = (*mockFeeEstimator)(nil)
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type mockForwardingLog struct {
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sync.Mutex
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events map[time.Time]channeldb.ForwardingEvent
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}
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func (m *mockForwardingLog) AddForwardingEvents(events []channeldb.ForwardingEvent) error {
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m.Lock()
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defer m.Unlock()
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for _, event := range events {
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m.events[event.Timestamp] = event
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}
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return nil
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}
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type mockServer struct {
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started int32 // To be used atomically.
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shutdown int32 // To be used atomically.
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wg sync.WaitGroup
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quit chan struct{}
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t testing.TB
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name string
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messages chan lnwire.Message
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errChan chan error
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id [33]byte
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htlcSwitch *Switch
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registry *mockInvoiceRegistry
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interceptorFuncs []messageInterceptor
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}
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var _ lnpeer.Peer = (*mockServer)(nil)
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func initDB() (*channeldb.DB, error) {
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tempPath, err := ioutil.TempDir("", "switchdb")
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if err != nil {
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return nil, err
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}
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db, err := channeldb.Open(tempPath)
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if err != nil {
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return nil, err
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}
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return db, err
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}
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func initSwitchWithDB(startingHeight uint32, db *channeldb.DB) (*Switch, error) {
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var err error
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if db == nil {
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db, err = initDB()
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if err != nil {
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return nil, err
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}
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}
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cfg := Config{
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DB: db,
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SwitchPackager: channeldb.NewSwitchPackager(),
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FwdingLog: &mockForwardingLog{
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events: make(map[time.Time]channeldb.ForwardingEvent),
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},
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FetchLastChannelUpdate: func(lnwire.ShortChannelID) (*lnwire.ChannelUpdate, error) {
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return nil, nil
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},
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Notifier: &mockNotifier{},
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FwdEventTicker: ticker.MockNew(DefaultFwdEventInterval),
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LogEventTicker: ticker.MockNew(DefaultLogInterval),
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NotifyActiveChannel: func(wire.OutPoint) {},
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NotifyInactiveChannel: func(wire.OutPoint) {},
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}
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return New(cfg, startingHeight)
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}
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func newMockServer(t testing.TB, name string, startingHeight uint32,
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db *channeldb.DB, defaultDelta uint32) (*mockServer, error) {
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var id [33]byte
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h := sha256.Sum256([]byte(name))
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copy(id[:], h[:])
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htlcSwitch, err := initSwitchWithDB(startingHeight, db)
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if err != nil {
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return nil, err
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}
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return &mockServer{
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t: t,
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id: id,
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name: name,
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messages: make(chan lnwire.Message, 3000),
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quit: make(chan struct{}),
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registry: newMockRegistry(defaultDelta),
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htlcSwitch: htlcSwitch,
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interceptorFuncs: make([]messageInterceptor, 0),
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}, nil
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}
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func (s *mockServer) Start() error {
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if !atomic.CompareAndSwapInt32(&s.started, 0, 1) {
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return errors.New("mock server already started")
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}
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if err := s.htlcSwitch.Start(); err != nil {
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return err
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}
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s.wg.Add(1)
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go func() {
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defer s.wg.Done()
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defer func() {
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s.htlcSwitch.Stop()
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}()
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for {
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select {
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case msg := <-s.messages:
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var shouldSkip bool
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for _, interceptor := range s.interceptorFuncs {
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skip, err := interceptor(msg)
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if err != nil {
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s.t.Fatalf("%v: error in the "+
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"interceptor: %v", s.name, err)
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return
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}
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shouldSkip = shouldSkip || skip
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}
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if shouldSkip {
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continue
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}
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if err := s.readHandler(msg); err != nil {
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s.t.Fatal(err)
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return
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}
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case <-s.quit:
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return
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}
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}
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}()
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return nil
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}
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func (s *mockServer) QuitSignal() <-chan struct{} {
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return s.quit
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}
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// mockHopIterator represents the test version of hop iterator which instead
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// of encrypting the path in onion blob just stores the path as a list of hops.
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type mockHopIterator struct {
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hops []ForwardingInfo
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}
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func newMockHopIterator(hops ...ForwardingInfo) HopIterator {
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return &mockHopIterator{hops: hops}
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}
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func (r *mockHopIterator) ForwardingInstructions() ForwardingInfo {
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h := r.hops[0]
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r.hops = r.hops[1:]
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return h
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}
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func (r *mockHopIterator) ExtractErrorEncrypter(
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extracter ErrorEncrypterExtracter) (ErrorEncrypter, lnwire.FailCode) {
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return extracter(nil)
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}
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func (r *mockHopIterator) EncodeNextHop(w io.Writer) error {
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var hopLength [4]byte
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binary.BigEndian.PutUint32(hopLength[:], uint32(len(r.hops)))
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if _, err := w.Write(hopLength[:]); err != nil {
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return err
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}
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for _, hop := range r.hops {
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if err := hop.encode(w); err != nil {
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return err
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}
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}
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return nil
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}
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func (f *ForwardingInfo) encode(w io.Writer) error {
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if _, err := w.Write([]byte{byte(f.Network)}); err != nil {
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return err
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}
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if err := binary.Write(w, binary.BigEndian, f.NextHop); err != nil {
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return err
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}
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if err := binary.Write(w, binary.BigEndian, f.AmountToForward); err != nil {
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return err
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}
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if err := binary.Write(w, binary.BigEndian, f.OutgoingCTLV); err != nil {
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return err
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}
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return nil
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}
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var _ HopIterator = (*mockHopIterator)(nil)
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// mockObfuscator mock implementation of the failure obfuscator which only
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// encodes the failure and do not makes any onion obfuscation.
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type mockObfuscator struct {
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ogPacket *sphinx.OnionPacket
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}
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// NewMockObfuscator initializes a dummy mockObfuscator used for testing.
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func NewMockObfuscator() ErrorEncrypter {
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return &mockObfuscator{}
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}
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func (o *mockObfuscator) OnionPacket() *sphinx.OnionPacket {
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return o.ogPacket
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}
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func (o *mockObfuscator) Type() EncrypterType {
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return EncrypterTypeMock
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}
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func (o *mockObfuscator) Encode(w io.Writer) error {
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return nil
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}
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func (o *mockObfuscator) Decode(r io.Reader) error {
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return nil
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}
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func (o *mockObfuscator) Reextract(extracter ErrorEncrypterExtracter) error {
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return nil
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}
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func (o *mockObfuscator) EncryptFirstHop(failure lnwire.FailureMessage) (
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lnwire.OpaqueReason, error) {
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var b bytes.Buffer
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if err := lnwire.EncodeFailure(&b, failure, 0); err != nil {
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return nil, err
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}
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return b.Bytes(), nil
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}
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func (o *mockObfuscator) IntermediateEncrypt(reason lnwire.OpaqueReason) lnwire.OpaqueReason {
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return reason
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}
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// mockDeobfuscator mock implementation of the failure deobfuscator which
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// only decodes the failure do not makes any onion obfuscation.
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type mockDeobfuscator struct{}
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func newMockDeobfuscator() ErrorDecrypter {
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return &mockDeobfuscator{}
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}
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func (o *mockDeobfuscator) DecryptError(reason lnwire.OpaqueReason) (*ForwardingError, error) {
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r := bytes.NewReader(reason)
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failure, err := lnwire.DecodeFailure(r, 0)
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if err != nil {
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return nil, err
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}
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return &ForwardingError{
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FailureMessage: failure,
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}, nil
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}
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var _ ErrorDecrypter = (*mockDeobfuscator)(nil)
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// mockIteratorDecoder test version of hop iterator decoder which decodes the
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// encoded array of hops.
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type mockIteratorDecoder struct {
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mu sync.RWMutex
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responses map[[32]byte][]DecodeHopIteratorResponse
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}
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func newMockIteratorDecoder() *mockIteratorDecoder {
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return &mockIteratorDecoder{
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responses: make(map[[32]byte][]DecodeHopIteratorResponse),
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}
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}
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func (p *mockIteratorDecoder) DecodeHopIterator(r io.Reader, rHash []byte,
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cltv uint32) (HopIterator, lnwire.FailCode) {
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var b [4]byte
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_, err := r.Read(b[:])
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if err != nil {
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return nil, lnwire.CodeTemporaryChannelFailure
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}
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hopLength := binary.BigEndian.Uint32(b[:])
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hops := make([]ForwardingInfo, hopLength)
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for i := uint32(0); i < hopLength; i++ {
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f := &ForwardingInfo{}
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if err := f.decode(r); err != nil {
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return nil, lnwire.CodeTemporaryChannelFailure
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}
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hops[i] = *f
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}
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return newMockHopIterator(hops...), lnwire.CodeNone
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}
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func (p *mockIteratorDecoder) DecodeHopIterators(id []byte,
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reqs []DecodeHopIteratorRequest) ([]DecodeHopIteratorResponse, error) {
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idHash := sha256.Sum256(id)
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p.mu.RLock()
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if resps, ok := p.responses[idHash]; ok {
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p.mu.RUnlock()
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return resps, nil
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}
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p.mu.RUnlock()
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batchSize := len(reqs)
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resps := make([]DecodeHopIteratorResponse, 0, batchSize)
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for _, req := range reqs {
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iterator, failcode := p.DecodeHopIterator(
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req.OnionReader, req.RHash, req.IncomingCltv,
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)
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resp := DecodeHopIteratorResponse{
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HopIterator: iterator,
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FailCode: failcode,
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}
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resps = append(resps, resp)
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}
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p.mu.Lock()
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p.responses[idHash] = resps
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p.mu.Unlock()
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return resps, nil
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}
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func (f *ForwardingInfo) decode(r io.Reader) error {
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var net [1]byte
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if _, err := r.Read(net[:]); err != nil {
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return err
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}
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f.Network = NetworkHop(net[0])
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if err := binary.Read(r, binary.BigEndian, &f.NextHop); err != nil {
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return err
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}
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if err := binary.Read(r, binary.BigEndian, &f.AmountToForward); err != nil {
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return err
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}
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if err := binary.Read(r, binary.BigEndian, &f.OutgoingCTLV); err != nil {
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return err
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}
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return nil
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}
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// messageInterceptor is function that handles the incoming peer messages and
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// may decide should the peer skip the message or not.
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type messageInterceptor func(m lnwire.Message) (bool, error)
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// Record is used to set the function which will be triggered when new
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// lnwire message was received.
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func (s *mockServer) intersect(f messageInterceptor) {
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s.interceptorFuncs = append(s.interceptorFuncs, f)
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}
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func (s *mockServer) SendMessage(sync bool, msgs ...lnwire.Message) error {
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for _, msg := range msgs {
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select {
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case s.messages <- msg:
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case <-s.quit:
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return errors.New("server is stopped")
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}
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}
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return nil
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}
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func (s *mockServer) readHandler(message lnwire.Message) error {
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var targetChan lnwire.ChannelID
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switch msg := message.(type) {
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case *lnwire.UpdateAddHTLC:
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targetChan = msg.ChanID
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case *lnwire.UpdateFulfillHTLC:
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targetChan = msg.ChanID
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case *lnwire.UpdateFailHTLC:
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targetChan = msg.ChanID
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case *lnwire.UpdateFailMalformedHTLC:
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targetChan = msg.ChanID
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case *lnwire.RevokeAndAck:
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targetChan = msg.ChanID
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case *lnwire.CommitSig:
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targetChan = msg.ChanID
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case *lnwire.FundingLocked:
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// Ignore
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return nil
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case *lnwire.ChannelReestablish:
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targetChan = msg.ChanID
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case *lnwire.UpdateFee:
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targetChan = msg.ChanID
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default:
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return fmt.Errorf("unknown message type: %T", msg)
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}
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// Dispatch the commitment update message to the proper channel link
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// dedicated to this channel. If the link is not found, we will discard
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// the message.
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link, err := s.htlcSwitch.GetLink(targetChan)
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if err != nil {
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return nil
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}
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// Create goroutine for this, in order to be able to properly stop
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// the server when handler stacked (server unavailable)
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link.HandleChannelUpdate(message)
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return nil
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}
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func (s *mockServer) PubKey() [33]byte {
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return s.id
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}
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func (s *mockServer) IdentityKey() *btcec.PublicKey {
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pubkey, _ := btcec.ParsePubKey(s.id[:], btcec.S256())
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return pubkey
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}
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func (s *mockServer) Address() net.Addr {
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return nil
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}
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func (s *mockServer) AddNewChannel(channel *channeldb.OpenChannel,
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cancel <-chan struct{}) error {
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return nil
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}
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func (s *mockServer) WipeChannel(*wire.OutPoint) error {
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return nil
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}
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func (s *mockServer) Stop() error {
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if !atomic.CompareAndSwapInt32(&s.shutdown, 0, 1) {
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return nil
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}
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close(s.quit)
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s.wg.Wait()
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return nil
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}
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func (s *mockServer) String() string {
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return s.name
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}
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type mockChannelLink struct {
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htlcSwitch *Switch
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shortChanID lnwire.ShortChannelID
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chanID lnwire.ChannelID
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peer lnpeer.Peer
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startMailBox bool
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mailBox MailBox
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packets chan *htlcPacket
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eligible bool
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htlcID uint64
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}
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// completeCircuit is a helper method for adding the finalized payment circuit
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// to the switch's circuit map. In testing, this should be executed after
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// receiving an htlc from the downstream packets channel.
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func (f *mockChannelLink) completeCircuit(pkt *htlcPacket) error {
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switch htlc := pkt.htlc.(type) {
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case *lnwire.UpdateAddHTLC:
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pkt.outgoingChanID = f.shortChanID
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pkt.outgoingHTLCID = f.htlcID
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htlc.ID = f.htlcID
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keystone := Keystone{pkt.inKey(), pkt.outKey()}
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if err := f.htlcSwitch.openCircuits(keystone); err != nil {
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return err
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}
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f.htlcID++
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case *lnwire.UpdateFulfillHTLC, *lnwire.UpdateFailHTLC:
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err := f.htlcSwitch.teardownCircuit(pkt)
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if err != nil {
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return err
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}
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}
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f.mailBox.AckPacket(pkt.inKey())
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return nil
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}
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func (f *mockChannelLink) deleteCircuit(pkt *htlcPacket) error {
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return f.htlcSwitch.deleteCircuits(pkt.inKey())
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}
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func newMockChannelLink(htlcSwitch *Switch, chanID lnwire.ChannelID,
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shortChanID lnwire.ShortChannelID, peer lnpeer.Peer, eligible bool,
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) *mockChannelLink {
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return &mockChannelLink{
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htlcSwitch: htlcSwitch,
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chanID: chanID,
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shortChanID: shortChanID,
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peer: peer,
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eligible: eligible,
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}
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}
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func (f *mockChannelLink) HandleSwitchPacket(pkt *htlcPacket) error {
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f.mailBox.AddPacket(pkt)
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return nil
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}
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func (f *mockChannelLink) HandleChannelUpdate(lnwire.Message) {
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}
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func (f *mockChannelLink) UpdateForwardingPolicy(_ ForwardingPolicy) {
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}
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func (f *mockChannelLink) HtlcSatifiesPolicy([32]byte, lnwire.MilliSatoshi,
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lnwire.MilliSatoshi, uint32, uint32, uint32) lnwire.FailureMessage {
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return nil
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}
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func (f *mockChannelLink) Stats() (uint64, lnwire.MilliSatoshi, lnwire.MilliSatoshi) {
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return 0, 0, 0
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}
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func (f *mockChannelLink) AttachMailBox(mailBox MailBox) {
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f.mailBox = mailBox
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f.packets = mailBox.PacketOutBox()
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}
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func (f *mockChannelLink) Start() error {
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f.mailBox.ResetMessages()
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f.mailBox.ResetPackets()
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return nil
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}
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func (f *mockChannelLink) ChanID() lnwire.ChannelID { return f.chanID }
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func (f *mockChannelLink) ShortChanID() lnwire.ShortChannelID { return f.shortChanID }
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func (f *mockChannelLink) Bandwidth() lnwire.MilliSatoshi { return 99999999 }
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func (f *mockChannelLink) Peer() lnpeer.Peer { return f.peer }
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func (f *mockChannelLink) ChannelPoint() *wire.OutPoint { return &wire.OutPoint{} }
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func (f *mockChannelLink) Stop() {}
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func (f *mockChannelLink) EligibleToForward() bool { return f.eligible }
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func (f *mockChannelLink) setLiveShortChanID(sid lnwire.ShortChannelID) { f.shortChanID = sid }
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func (f *mockChannelLink) UpdateShortChanID() (lnwire.ShortChannelID, error) {
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f.eligible = true
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return f.shortChanID, nil
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}
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var _ ChannelLink = (*mockChannelLink)(nil)
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type mockInvoiceRegistry struct {
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sync.Mutex
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invoices map[lntypes.Hash]channeldb.Invoice
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finalDelta uint32
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}
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func newMockRegistry(minDelta uint32) *mockInvoiceRegistry {
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return &mockInvoiceRegistry{
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finalDelta: minDelta,
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invoices: make(map[lntypes.Hash]channeldb.Invoice),
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}
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}
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func (i *mockInvoiceRegistry) LookupInvoice(rHash lntypes.Hash) (channeldb.Invoice, uint32, error) {
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i.Lock()
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defer i.Unlock()
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invoice, ok := i.invoices[rHash]
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if !ok {
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return channeldb.Invoice{}, 0, fmt.Errorf("can't find mock "+
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"invoice: %x", rHash[:])
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}
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return invoice, i.finalDelta, nil
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}
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func (i *mockInvoiceRegistry) SettleInvoice(rhash lntypes.Hash,
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amt lnwire.MilliSatoshi) error {
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i.Lock()
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defer i.Unlock()
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invoice, ok := i.invoices[rhash]
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if !ok {
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return fmt.Errorf("can't find mock invoice: %x", rhash[:])
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}
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if invoice.Terms.State == channeldb.ContractSettled {
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return nil
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}
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invoice.Terms.State = channeldb.ContractSettled
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invoice.AmtPaid = amt
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i.invoices[rhash] = invoice
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return nil
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}
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func (i *mockInvoiceRegistry) CancelInvoice(payHash lntypes.Hash) error {
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i.Lock()
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defer i.Unlock()
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invoice, ok := i.invoices[payHash]
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if !ok {
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return channeldb.ErrInvoiceNotFound
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}
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if invoice.Terms.State == channeldb.ContractCanceled {
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return nil
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}
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invoice.Terms.State = channeldb.ContractCanceled
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i.invoices[payHash] = invoice
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return nil
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}
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func (i *mockInvoiceRegistry) AddInvoice(invoice channeldb.Invoice) error {
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i.Lock()
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defer i.Unlock()
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rhash := invoice.Terms.PaymentPreimage.Hash()
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i.invoices[rhash] = invoice
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return nil
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}
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var _ InvoiceDatabase = (*mockInvoiceRegistry)(nil)
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type mockSigner struct {
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key *btcec.PrivateKey
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}
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func (m *mockSigner) SignOutputRaw(tx *wire.MsgTx, signDesc *input.SignDescriptor) ([]byte, error) {
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amt := signDesc.Output.Value
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witnessScript := signDesc.WitnessScript
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privKey := m.key
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if !privKey.PubKey().IsEqual(signDesc.KeyDesc.PubKey) {
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return nil, fmt.Errorf("incorrect key passed")
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}
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switch {
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case signDesc.SingleTweak != nil:
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privKey = input.TweakPrivKey(privKey,
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signDesc.SingleTweak)
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case signDesc.DoubleTweak != nil:
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privKey = input.DeriveRevocationPrivKey(privKey,
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signDesc.DoubleTweak)
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}
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sig, err := txscript.RawTxInWitnessSignature(tx, signDesc.SigHashes,
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signDesc.InputIndex, amt, witnessScript, signDesc.HashType,
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privKey)
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if err != nil {
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return nil, err
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}
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return sig[:len(sig)-1], nil
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}
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func (m *mockSigner) ComputeInputScript(tx *wire.MsgTx, signDesc *input.SignDescriptor) (*input.Script, error) {
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// TODO(roasbeef): expose tweaked signer from lnwallet so don't need to
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// duplicate this code?
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privKey := m.key
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switch {
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case signDesc.SingleTweak != nil:
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privKey = input.TweakPrivKey(privKey,
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signDesc.SingleTweak)
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case signDesc.DoubleTweak != nil:
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privKey = input.DeriveRevocationPrivKey(privKey,
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signDesc.DoubleTweak)
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}
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witnessScript, err := txscript.WitnessSignature(tx, signDesc.SigHashes,
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signDesc.InputIndex, signDesc.Output.Value, signDesc.Output.PkScript,
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signDesc.HashType, privKey, true)
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if err != nil {
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return nil, err
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}
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return &input.Script{
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Witness: witnessScript,
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}, nil
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}
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type mockNotifier struct {
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epochChan chan *chainntnfs.BlockEpoch
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}
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func (m *mockNotifier) RegisterConfirmationsNtfn(txid *chainhash.Hash, _ []byte,
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numConfs uint32, heightHint uint32) (*chainntnfs.ConfirmationEvent, error) {
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return nil, nil
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}
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func (m *mockNotifier) RegisterBlockEpochNtfn(
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bestBlock *chainntnfs.BlockEpoch) (*chainntnfs.BlockEpochEvent, error) {
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return &chainntnfs.BlockEpochEvent{
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Epochs: m.epochChan,
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Cancel: func() {},
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}, nil
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}
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func (m *mockNotifier) Start() error {
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return nil
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}
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func (m *mockNotifier) Stop() error {
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return nil
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}
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func (m *mockNotifier) RegisterSpendNtfn(outpoint *wire.OutPoint, _ []byte,
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heightHint uint32) (*chainntnfs.SpendEvent, error) {
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return &chainntnfs.SpendEvent{
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Spend: make(chan *chainntnfs.SpendDetail),
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}, nil
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}
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