lnd.xprv/htlcswitch/test_utils.go

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package htlcswitch
import (
"bytes"
"crypto/rand"
"crypto/sha256"
"encoding/binary"
"fmt"
"io/ioutil"
"math/big"
"net"
"os"
"sync/atomic"
"testing"
"time"
"github.com/btcsuite/fastsha256"
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"github.com/coreos/bbolt"
"github.com/go-errors/errors"
"github.com/lightningnetwork/lnd/chainntnfs"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/contractcourt"
"github.com/lightningnetwork/lnd/keychain"
"github.com/lightningnetwork/lnd/lnwallet"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/shachain"
"github.com/roasbeef/btcd/btcec"
"github.com/roasbeef/btcd/chaincfg/chainhash"
"github.com/roasbeef/btcd/wire"
"github.com/roasbeef/btcutil"
)
var (
alicePrivKey = []byte("alice priv key")
bobPrivKey = []byte("bob priv key")
carolPrivKey = []byte("carol priv key")
testPrivKey = []byte{
0x81, 0xb6, 0x37, 0xd8, 0xfc, 0xd2, 0xc6, 0xda,
0x63, 0x59, 0xe6, 0x96, 0x31, 0x13, 0xa1, 0x17,
0xd, 0xe7, 0x95, 0xe4, 0xb7, 0x25, 0xb8, 0x4d,
0x1e, 0xb, 0x4c, 0xfd, 0x9e, 0xc5, 0x8c, 0xe9,
}
_, testPubKey = btcec.PrivKeyFromBytes(btcec.S256(), testPrivKey)
testSig = &btcec.Signature{
R: new(big.Int),
S: new(big.Int),
}
wireSig, _ = lnwire.NewSigFromSignature(testSig)
_, _ = testSig.R.SetString("6372440660162918006277497454296753625158993"+
"5445068131219452686511677818569431", 10)
_, _ = testSig.S.SetString("1880105606924982582529128710493133386286603"+
"3135609736119018462340006816851118", 10)
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// testTx is used as the default funding txn for single-funder channels.
testTx = &wire.MsgTx{
Version: 1,
TxIn: []*wire.TxIn{
{
PreviousOutPoint: wire.OutPoint{
Hash: chainhash.Hash{},
Index: 0xffffffff,
},
SignatureScript: []byte{0x04, 0x31, 0xdc, 0x00, 0x1b, 0x01, 0x62},
Sequence: 0xffffffff,
},
},
TxOut: []*wire.TxOut{
{
Value: 5000000000,
PkScript: []byte{
0x41, // OP_DATA_65
0x04, 0xd6, 0x4b, 0xdf, 0xd0, 0x9e, 0xb1, 0xc5,
0xfe, 0x29, 0x5a, 0xbd, 0xeb, 0x1d, 0xca, 0x42,
0x81, 0xbe, 0x98, 0x8e, 0x2d, 0xa0, 0xb6, 0xc1,
0xc6, 0xa5, 0x9d, 0xc2, 0x26, 0xc2, 0x86, 0x24,
0xe1, 0x81, 0x75, 0xe8, 0x51, 0xc9, 0x6b, 0x97,
0x3d, 0x81, 0xb0, 0x1c, 0xc3, 0x1f, 0x04, 0x78,
0x34, 0xbc, 0x06, 0xd6, 0xd6, 0xed, 0xf6, 0x20,
0xd1, 0x84, 0x24, 0x1a, 0x6a, 0xed, 0x8b, 0x63,
0xa6, // 65-byte signature
0xac, // OP_CHECKSIG
},
},
},
LockTime: 5,
}
)
var idSeqNum uint64
func genIDs() (lnwire.ChannelID, lnwire.ChannelID, lnwire.ShortChannelID,
lnwire.ShortChannelID) {
id := atomic.AddUint64(&idSeqNum, 2)
var scratch [8]byte
binary.BigEndian.PutUint64(scratch[:], id)
hash1, _ := chainhash.NewHash(bytes.Repeat(scratch[:], 4))
binary.BigEndian.PutUint64(scratch[:], id+1)
hash2, _ := chainhash.NewHash(bytes.Repeat(scratch[:], 4))
chanPoint1 := wire.NewOutPoint(hash1, uint32(id))
chanPoint2 := wire.NewOutPoint(hash2, uint32(id+1))
chanID1 := lnwire.NewChanIDFromOutPoint(chanPoint1)
chanID2 := lnwire.NewChanIDFromOutPoint(chanPoint2)
aliceChanID := lnwire.NewShortChanIDFromInt(id)
bobChanID := lnwire.NewShortChanIDFromInt(id + 1)
return chanID1, chanID2, aliceChanID, bobChanID
}
// mockGetChanUpdateMessage helper function which returns topology update of
// the channel
func mockGetChanUpdateMessage(cid lnwire.ShortChannelID) (*lnwire.ChannelUpdate, error) {
return &lnwire.ChannelUpdate{
Signature: wireSig,
}, nil
}
// generateRandomBytes returns securely generated random bytes.
// It will return an error if the system's secure random
// number generator fails to function correctly, in which
// case the caller should not continue.
func generateRandomBytes(n int) ([]byte, error) {
b := make([]byte, n)
// TODO(roasbeef): should use counter in tests (atomic) rather than
// this
_, err := rand.Read(b[:])
// Note that Err == nil only if we read len(b) bytes.
if err != nil {
return nil, err
}
return b, nil
}
// createTestChannel creates the channel and returns our and remote channels
// representations.
//
// TODO(roasbeef): need to factor out, similar func re-used in many parts of codebase
func createTestChannel(alicePrivKey, bobPrivKey []byte,
aliceAmount, bobAmount, aliceReserve, bobReserve btcutil.Amount,
chanID lnwire.ShortChannelID) (*lnwallet.LightningChannel, *lnwallet.LightningChannel, func(),
func() (*lnwallet.LightningChannel, *lnwallet.LightningChannel,
error), error) {
aliceKeyPriv, aliceKeyPub := btcec.PrivKeyFromBytes(btcec.S256(), alicePrivKey)
bobKeyPriv, bobKeyPub := btcec.PrivKeyFromBytes(btcec.S256(), bobPrivKey)
channelCapacity := aliceAmount + bobAmount
csvTimeoutAlice := uint32(5)
csvTimeoutBob := uint32(4)
aliceConstraints := &channeldb.ChannelConstraints{
DustLimit: btcutil.Amount(200),
MaxPendingAmount: lnwire.NewMSatFromSatoshis(
channelCapacity),
ChanReserve: aliceReserve,
MinHTLC: 0,
MaxAcceptedHtlcs: lnwallet.MaxHTLCNumber / 2,
}
bobConstraints := &channeldb.ChannelConstraints{
DustLimit: btcutil.Amount(800),
MaxPendingAmount: lnwire.NewMSatFromSatoshis(
channelCapacity),
ChanReserve: bobReserve,
MinHTLC: 0,
MaxAcceptedHtlcs: lnwallet.MaxHTLCNumber / 2,
}
var hash [sha256.Size]byte
randomSeed, err := generateRandomBytes(sha256.Size)
if err != nil {
return nil, nil, nil, nil, err
}
copy(hash[:], randomSeed)
prevOut := &wire.OutPoint{
Hash: chainhash.Hash(hash),
Index: 0,
}
fundingTxIn := wire.NewTxIn(prevOut, nil, nil)
aliceCfg := channeldb.ChannelConfig{
ChannelConstraints: *aliceConstraints,
CsvDelay: uint16(csvTimeoutAlice),
MultiSigKey: keychain.KeyDescriptor{
PubKey: aliceKeyPub,
},
RevocationBasePoint: keychain.KeyDescriptor{
PubKey: aliceKeyPub,
},
PaymentBasePoint: keychain.KeyDescriptor{
PubKey: aliceKeyPub,
},
DelayBasePoint: keychain.KeyDescriptor{
PubKey: aliceKeyPub,
},
HtlcBasePoint: keychain.KeyDescriptor{
PubKey: aliceKeyPub,
},
}
bobCfg := channeldb.ChannelConfig{
ChannelConstraints: *bobConstraints,
CsvDelay: uint16(csvTimeoutBob),
MultiSigKey: keychain.KeyDescriptor{
PubKey: bobKeyPub,
},
RevocationBasePoint: keychain.KeyDescriptor{
PubKey: bobKeyPub,
},
PaymentBasePoint: keychain.KeyDescriptor{
PubKey: bobKeyPub,
},
DelayBasePoint: keychain.KeyDescriptor{
PubKey: bobKeyPub,
},
HtlcBasePoint: keychain.KeyDescriptor{
PubKey: bobKeyPub,
},
}
bobRoot, err := chainhash.NewHash(bobKeyPriv.Serialize())
if err != nil {
return nil, nil, nil, nil, err
}
bobPreimageProducer := shachain.NewRevocationProducer(*bobRoot)
bobFirstRevoke, err := bobPreimageProducer.AtIndex(0)
if err != nil {
return nil, nil, nil, nil, err
}
bobCommitPoint := lnwallet.ComputeCommitmentPoint(bobFirstRevoke[:])
aliceRoot, err := chainhash.NewHash(aliceKeyPriv.Serialize())
if err != nil {
return nil, nil, nil, nil, err
}
alicePreimageProducer := shachain.NewRevocationProducer(*aliceRoot)
aliceFirstRevoke, err := alicePreimageProducer.AtIndex(0)
if err != nil {
return nil, nil, nil, nil, err
}
aliceCommitPoint := lnwallet.ComputeCommitmentPoint(aliceFirstRevoke[:])
aliceCommitTx, bobCommitTx, err := lnwallet.CreateCommitmentTxns(aliceAmount,
bobAmount, &aliceCfg, &bobCfg, aliceCommitPoint, bobCommitPoint,
*fundingTxIn)
if err != nil {
return nil, nil, nil, nil, err
}
alicePath, err := ioutil.TempDir("", "alicedb")
dbAlice, err := channeldb.Open(alicePath)
if err != nil {
return nil, nil, nil, nil, err
}
bobPath, err := ioutil.TempDir("", "bobdb")
dbBob, err := channeldb.Open(bobPath)
if err != nil {
return nil, nil, nil, nil, err
}
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estimator := &lnwallet.StaticFeeEstimator{
FeeRate: 24,
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}
feePerVSize, err := estimator.EstimateFeePerVSize(1)
if err != nil {
return nil, nil, nil, nil, err
}
feePerKw := feePerVSize.FeePerKWeight()
commitFee := feePerKw.FeeForWeight(724)
const broadcastHeight = 1
bobAddr := &net.TCPAddr{
IP: net.ParseIP("127.0.0.1"),
Port: 18555,
}
aliceAddr := &net.TCPAddr{
IP: net.ParseIP("127.0.0.1"),
Port: 18556,
}
aliceCommit := channeldb.ChannelCommitment{
CommitHeight: 0,
LocalBalance: lnwire.NewMSatFromSatoshis(aliceAmount - commitFee),
RemoteBalance: lnwire.NewMSatFromSatoshis(bobAmount),
CommitFee: commitFee,
FeePerKw: btcutil.Amount(feePerKw),
CommitTx: aliceCommitTx,
CommitSig: bytes.Repeat([]byte{1}, 71),
}
bobCommit := channeldb.ChannelCommitment{
CommitHeight: 0,
LocalBalance: lnwire.NewMSatFromSatoshis(bobAmount),
RemoteBalance: lnwire.NewMSatFromSatoshis(aliceAmount - commitFee),
CommitFee: commitFee,
FeePerKw: btcutil.Amount(feePerKw),
CommitTx: bobCommitTx,
CommitSig: bytes.Repeat([]byte{1}, 71),
}
aliceChannelState := &channeldb.OpenChannel{
LocalChanCfg: aliceCfg,
RemoteChanCfg: bobCfg,
IdentityPub: aliceKeyPub,
FundingOutpoint: *prevOut,
ChanType: channeldb.SingleFunder,
IsInitiator: true,
Capacity: channelCapacity,
RemoteCurrentRevocation: bobCommitPoint,
RevocationProducer: alicePreimageProducer,
RevocationStore: shachain.NewRevocationStore(),
LocalCommitment: aliceCommit,
RemoteCommitment: aliceCommit,
ShortChanID: chanID,
Db: dbAlice,
Packager: channeldb.NewChannelPackager(chanID),
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FundingTxn: testTx,
}
bobChannelState := &channeldb.OpenChannel{
LocalChanCfg: bobCfg,
RemoteChanCfg: aliceCfg,
IdentityPub: bobKeyPub,
FundingOutpoint: *prevOut,
ChanType: channeldb.SingleFunder,
IsInitiator: false,
Capacity: channelCapacity,
RemoteCurrentRevocation: aliceCommitPoint,
RevocationProducer: bobPreimageProducer,
RevocationStore: shachain.NewRevocationStore(),
LocalCommitment: bobCommit,
RemoteCommitment: bobCommit,
ShortChanID: chanID,
Db: dbBob,
Packager: channeldb.NewChannelPackager(chanID),
}
if err := aliceChannelState.SyncPending(bobAddr, broadcastHeight); err != nil {
return nil, nil, nil, nil, err
}
if err := bobChannelState.SyncPending(aliceAddr, broadcastHeight); err != nil {
return nil, nil, nil, nil, err
}
cleanUpFunc := func() {
dbAlice.Close()
dbBob.Close()
os.RemoveAll(bobPath)
os.RemoveAll(alicePath)
}
aliceSigner := &mockSigner{aliceKeyPriv}
bobSigner := &mockSigner{bobKeyPriv}
pCache := &mockPreimageCache{
// hash -> preimage
preimageMap: make(map[[32]byte][]byte),
}
channelAlice, err := lnwallet.NewLightningChannel(
aliceSigner, pCache, aliceChannelState,
)
if err != nil {
return nil, nil, nil, nil, err
}
channelBob, err := lnwallet.NewLightningChannel(
bobSigner, pCache, bobChannelState,
)
if err != nil {
return nil, nil, nil, nil, err
}
// Now that the channel are open, simulate the start of a session by
// having Alice and Bob extend their revocation windows to each other.
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aliceNextRevoke, err := channelAlice.NextRevocationKey()
if err != nil {
return nil, nil, nil, nil, err
}
if err := channelBob.InitNextRevocation(aliceNextRevoke); err != nil {
return nil, nil, nil, nil, err
}
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bobNextRevoke, err := channelBob.NextRevocationKey()
if err != nil {
return nil, nil, nil, nil, err
}
if err := channelAlice.InitNextRevocation(bobNextRevoke); err != nil {
return nil, nil, nil, nil, err
}
restore := func() (*lnwallet.LightningChannel, *lnwallet.LightningChannel,
error) {
aliceStoredChannels, err := dbAlice.FetchOpenChannels(aliceKeyPub)
switch err {
case nil:
case bolt.ErrDatabaseNotOpen:
dbAlice, err = channeldb.Open(dbAlice.Path())
if err != nil {
return nil, nil, errors.Errorf("unable to reopen alice "+
"db: %v", err)
}
aliceStoredChannels, err = dbAlice.FetchOpenChannels(aliceKeyPub)
if err != nil {
return nil, nil, errors.Errorf("unable to fetch alice "+
"channel: %v", err)
}
default:
return nil, nil, errors.Errorf("unable to fetch alice channel: "+
"%v", err)
}
var aliceStoredChannel *channeldb.OpenChannel
for _, channel := range aliceStoredChannels {
if channel.FundingOutpoint.String() == prevOut.String() {
aliceStoredChannel = channel
break
}
}
if aliceStoredChannel == nil {
return nil, nil, errors.New("unable to find stored alice channel")
}
newAliceChannel, err := lnwallet.NewLightningChannel(aliceSigner,
nil, aliceStoredChannel)
if err != nil {
return nil, nil, errors.Errorf("unable to create new channel: %v",
err)
}
bobStoredChannels, err := dbBob.FetchOpenChannels(bobKeyPub)
switch err {
case nil:
case bolt.ErrDatabaseNotOpen:
dbBob, err = channeldb.Open(dbBob.Path())
if err != nil {
return nil, nil, errors.Errorf("unable to reopen bob "+
"db: %v", err)
}
bobStoredChannels, err = dbBob.FetchOpenChannels(bobKeyPub)
if err != nil {
return nil, nil, errors.Errorf("unable to fetch bob "+
"channel: %v", err)
}
default:
return nil, nil, errors.Errorf("unable to fetch bob channel: "+
"%v", err)
}
var bobStoredChannel *channeldb.OpenChannel
for _, channel := range bobStoredChannels {
if channel.FundingOutpoint.String() == prevOut.String() {
bobStoredChannel = channel
break
}
}
if bobStoredChannel == nil {
return nil, nil, errors.New("unable to find stored bob channel")
}
newBobChannel, err := lnwallet.NewLightningChannel(bobSigner,
nil, bobStoredChannel)
if err != nil {
return nil, nil, errors.Errorf("unable to create new channel: %v",
err)
}
return newAliceChannel, newBobChannel, nil
}
return channelAlice, channelBob, cleanUpFunc, restore, nil
}
// getChanID retrieves the channel point from nwire message.
func getChanID(msg lnwire.Message) (lnwire.ChannelID, error) {
var chanID lnwire.ChannelID
switch msg := msg.(type) {
case *lnwire.UpdateAddHTLC:
chanID = msg.ChanID
case *lnwire.UpdateFulfillHTLC:
chanID = msg.ChanID
case *lnwire.UpdateFailHTLC:
chanID = msg.ChanID
case *lnwire.RevokeAndAck:
chanID = msg.ChanID
case *lnwire.CommitSig:
chanID = msg.ChanID
case *lnwire.ChannelReestablish:
chanID = msg.ChanID
case *lnwire.FundingLocked:
chanID = msg.ChanID
case *lnwire.UpdateFee:
chanID = msg.ChanID
default:
return chanID, fmt.Errorf("unknown type: %T", msg)
}
return chanID, nil
}
// generatePayment generates the htlc add request by given path blob and
// invoice which should be added by destination peer.
func generatePayment(invoiceAmt, htlcAmt lnwire.MilliSatoshi, timelock uint32,
blob [lnwire.OnionPacketSize]byte) (*channeldb.Invoice, *lnwire.UpdateAddHTLC, error) {
var preimage [sha256.Size]byte
r, err := generateRandomBytes(sha256.Size)
if err != nil {
return nil, nil, err
}
copy(preimage[:], r)
rhash := fastsha256.Sum256(preimage[:])
invoice := &channeldb.Invoice{
CreationDate: time.Now(),
Terms: channeldb.ContractTerm{
Value: invoiceAmt,
PaymentPreimage: preimage,
},
}
htlc := &lnwire.UpdateAddHTLC{
PaymentHash: rhash,
Amount: htlcAmt,
Expiry: timelock,
OnionBlob: blob,
}
return invoice, htlc, nil
}
// generateRoute generates the path blob by given array of peers.
func generateRoute(hops ...ForwardingInfo) ([lnwire.OnionPacketSize]byte, error) {
var blob [lnwire.OnionPacketSize]byte
if len(hops) == 0 {
return blob, errors.New("empty path")
}
iterator := newMockHopIterator(hops...)
w := bytes.NewBuffer(blob[0:0])
if err := iterator.EncodeNextHop(w); err != nil {
return blob, err
}
return blob, nil
}
// threeHopNetwork is used for managing the created cluster of 3 hops.
type threeHopNetwork struct {
aliceServer *mockServer
aliceChannelLink *channelLink
aliceBlockEpoch chan *chainntnfs.BlockEpoch
aliceTicker *time.Ticker
firstBobChannelLink *channelLink
bobFirstBlockEpoch chan *chainntnfs.BlockEpoch
firstBobTicker *time.Ticker
bobServer *mockServer
secondBobChannelLink *channelLink
bobSecondBlockEpoch chan *chainntnfs.BlockEpoch
secondBobTicker *time.Ticker
carolChannelLink *channelLink
carolServer *mockServer
carolBlockEpoch chan *chainntnfs.BlockEpoch
carolTicker *time.Ticker
feeEstimator *mockFeeEstimator
globalPolicy ForwardingPolicy
}
// generateHops creates the per hop payload, the total amount to be sent, and
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// also the time lock value needed to route an HTLC with the target amount over
// the specified path.
func generateHops(payAmt lnwire.MilliSatoshi, startingHeight uint32,
path ...*channelLink) (lnwire.MilliSatoshi, uint32, []ForwardingInfo) {
lastHop := path[len(path)-1]
totalTimelock := startingHeight
runningAmt := payAmt
hops := make([]ForwardingInfo, len(path))
for i := len(path) - 1; i >= 0; i-- {
// If this is the last hop, then the next hop is the special
// "exit node". Otherwise, we look to the "prior" hop.
nextHop := exitHop
if i != len(path)-1 {
nextHop = path[i+1].channel.ShortChanID()
}
// If this is the last, hop, then the time lock will be their
// specified delta policy plus our starting height.
totalTimelock += lastHop.cfg.FwrdingPolicy.TimeLockDelta
timeLock := totalTimelock
// Otherwise, the outgoing time lock should be the incoming
// timelock minus their specified delta.
if i != len(path)-1 {
delta := path[i].cfg.FwrdingPolicy.TimeLockDelta
timeLock = totalTimelock - delta
}
// Finally, we'll need to calculate the amount to forward. For
// the last hop, it's just the payment amount.
amount := payAmt
if i != len(path)-1 {
prevHop := hops[i+1]
prevAmount := prevHop.AmountToForward
fee := ExpectedFee(path[i].cfg.FwrdingPolicy, prevAmount)
runningAmt += fee
// Otherwise, for a node to forward an HTLC, then
// following inequality most hold true:
// * amt_in - fee >= amt_to_forward
amount = runningAmt - fee
}
hops[i] = ForwardingInfo{
Network: BitcoinHop,
NextHop: nextHop,
AmountToForward: amount,
OutgoingCTLV: timeLock,
}
}
return runningAmt, totalTimelock, hops
}
type paymentResponse struct {
rhash chainhash.Hash
err chan error
}
func (r *paymentResponse) Wait(d time.Duration) (chainhash.Hash, error) {
select {
case err := <-r.err:
close(r.err)
return r.rhash, err
case <-time.After(d):
return r.rhash, errors.New("htlc was no settled in time")
}
}
// makePayment takes the destination node and amount as input, sends the
// payment and returns the error channel to wait for error to be received and
// invoice in order to check its status after the payment finished.
//
// With this function you can send payments:
// * from Alice to Bob
// * from Alice to Carol through the Bob
// * from Alice to some another peer through the Bob
func (n *threeHopNetwork) makePayment(sendingPeer, receivingPeer Peer,
firstHopPub [33]byte, hops []ForwardingInfo,
invoiceAmt, htlcAmt lnwire.MilliSatoshi,
timelock uint32) *paymentResponse {
paymentErr := make(chan error, 1)
var rhash chainhash.Hash
sender := sendingPeer.(*mockServer)
receiver := receivingPeer.(*mockServer)
// Generate route convert it to blob, and return next destination for
// htlc add request.
blob, err := generateRoute(hops...)
if err != nil {
paymentErr <- err
return &paymentResponse{
rhash: rhash,
err: paymentErr,
}
}
// Generate payment: invoice and htlc.
invoice, htlc, err := generatePayment(invoiceAmt, htlcAmt, timelock, blob)
if err != nil {
paymentErr <- err
return &paymentResponse{
rhash: rhash,
err: paymentErr,
}
}
rhash = fastsha256.Sum256(invoice.Terms.PaymentPreimage[:])
// Check who is last in the route and add invoice to server registry.
if err := receiver.registry.AddInvoice(*invoice); err != nil {
paymentErr <- err
return &paymentResponse{
rhash: rhash,
err: paymentErr,
}
}
// Send payment and expose err channel.
go func() {
_, err := sender.htlcSwitch.SendHTLC(firstHopPub, htlc,
newMockDeobfuscator())
paymentErr <- err
}()
return &paymentResponse{
rhash: rhash,
err: paymentErr,
}
}
// start starts the three hop network alice,bob,carol servers.
func (n *threeHopNetwork) start() error {
if err := n.aliceServer.Start(); err != nil {
return err
}
if err := n.bobServer.Start(); err != nil {
return err
}
if err := n.carolServer.Start(); err != nil {
return err
}
return nil
}
// stop stops nodes and cleanup its databases.
func (n *threeHopNetwork) stop() {
done := make(chan struct{})
go func() {
n.aliceServer.Stop()
done <- struct{}{}
}()
go func() {
n.bobServer.Stop()
done <- struct{}{}
}()
go func() {
n.carolServer.Stop()
done <- struct{}{}
}()
n.aliceTicker.Stop()
n.firstBobTicker.Stop()
n.secondBobTicker.Stop()
n.carolTicker.Stop()
for i := 0; i < 3; i++ {
<-done
}
}
type clusterChannels struct {
aliceToBob *lnwallet.LightningChannel
bobToAlice *lnwallet.LightningChannel
bobToCarol *lnwallet.LightningChannel
carolToBob *lnwallet.LightningChannel
}
// createClusterChannels creates lightning channels which are needed for
// network cluster to be initialized.
func createClusterChannels(aliceToBob, bobToCarol btcutil.Amount) (
*clusterChannels, func(), func() (*clusterChannels, error), error) {
_, _, firstChanID, secondChanID := genIDs()
// Create lightning channels between Alice<->Bob and Bob<->Carol
aliceChannel, firstBobChannel, cleanAliceBob, restoreAliceBob, err :=
createTestChannel(alicePrivKey, bobPrivKey, aliceToBob,
aliceToBob, 0, 0, firstChanID)
if err != nil {
return nil, nil, nil, errors.Errorf("unable to create "+
"alice<->bob channel: %v", err)
}
secondBobChannel, carolChannel, cleanBobCarol, restoreBobCarol, err :=
createTestChannel(bobPrivKey, carolPrivKey, bobToCarol,
bobToCarol, 0, 0, secondChanID)
if err != nil {
cleanAliceBob()
return nil, nil, nil, errors.Errorf("unable to create "+
"bob<->carol channel: %v", err)
}
cleanUp := func() {
cleanAliceBob()
cleanBobCarol()
}
restoreFromDb := func() (*clusterChannels, error) {
a2b, b2a, err := restoreAliceBob()
if err != nil {
return nil, err
}
b2c, c2b, err := restoreBobCarol()
if err != nil {
return nil, err
}
return &clusterChannels{
aliceToBob: a2b,
bobToAlice: b2a,
bobToCarol: b2c,
carolToBob: c2b,
}, nil
}
return &clusterChannels{
aliceToBob: aliceChannel,
bobToAlice: firstBobChannel,
bobToCarol: secondBobChannel,
carolToBob: carolChannel,
}, cleanUp, restoreFromDb, nil
}
// newThreeHopNetwork function creates the following topology and returns the
// control object to manage this cluster:
//
// alice bob carol
// server - <-connection-> - server - - <-connection-> - - - server
// | | |
// alice htlc bob htlc carol htlc
// switch switch \ switch
// | | \ |
// | | \ |
// alice first bob second bob carol
// channel link channel link channel link channel link
//
func newThreeHopNetwork(t testing.TB, aliceChannel, firstBobChannel,
secondBobChannel, carolChannel *lnwallet.LightningChannel,
startingHeight uint32) *threeHopNetwork {
aliceDb := aliceChannel.State().Db
bobDb := firstBobChannel.State().Db
carolDb := carolChannel.State().Db
// Create three peers/servers.
aliceServer, err := newMockServer(t, "alice", aliceDb)
if err != nil {
t.Fatalf("unable to create alice server: %v", err)
}
bobServer, err := newMockServer(t, "bob", bobDb)
if err != nil {
t.Fatalf("unable to create bob server: %v", err)
}
carolServer, err := newMockServer(t, "carol", carolDb)
if err != nil {
t.Fatalf("unable to create carol server: %v", err)
}
// Create mock decoder instead of sphinx one in order to mock the route
// which htlc should follow.
aliceDecoder := newMockIteratorDecoder()
bobDecoder := newMockIteratorDecoder()
carolDecoder := newMockIteratorDecoder()
feeEstimator := &mockFeeEstimator{
byteFeeIn: make(chan lnwallet.SatPerVByte),
quit: make(chan struct{}),
}
pCache := &mockPreimageCache{
// hash -> preimage
preimageMap: make(map[[32]byte][]byte),
}
globalPolicy := ForwardingPolicy{
MinHTLC: lnwire.NewMSatFromSatoshis(5),
BaseFee: lnwire.NewMSatFromSatoshis(1),
TimeLockDelta: 6,
}
obfuscator := NewMockObfuscator()
aliceEpochChan := make(chan *chainntnfs.BlockEpoch)
aliceEpoch := &chainntnfs.BlockEpochEvent{
Epochs: aliceEpochChan,
Cancel: func() {
},
}
aliceTicker := time.NewTicker(50 * time.Millisecond)
aliceChannelLink := NewChannelLink(
ChannelLinkConfig{
Switch: aliceServer.htlcSwitch,
FwrdingPolicy: globalPolicy,
Peer: bobServer,
Circuits: aliceServer.htlcSwitch.CircuitModifier(),
ForwardPackets: aliceServer.htlcSwitch.ForwardPackets,
DecodeHopIterators: aliceDecoder.DecodeHopIterators,
ExtractErrorEncrypter: func(*btcec.PublicKey) (
ErrorEncrypter, lnwire.FailCode) {
return obfuscator, lnwire.CodeNone
},
FetchLastChannelUpdate: mockGetChanUpdateMessage,
Registry: aliceServer.registry,
BlockEpochs: aliceEpoch,
FeeEstimator: feeEstimator,
PreimageCache: pCache,
UpdateContractSignals: func(*contractcourt.ContractSignals) error {
return nil
},
ChainEvents: &contractcourt.ChainEventSubscription{},
SyncStates: true,
BatchTicker: &mockTicker{aliceTicker.C},
FwdPkgGCTicker: &mockTicker{time.NewTicker(5 * time.Second).C},
BatchSize: 10,
},
aliceChannel,
startingHeight,
)
if err := aliceServer.htlcSwitch.AddLink(aliceChannelLink); err != nil {
t.Fatalf("unable to add alice channel link: %v", err)
}
go func() {
for {
select {
case <-aliceChannelLink.(*channelLink).htlcUpdates:
case <-aliceChannelLink.(*channelLink).quit:
return
}
}
}()
bobFirstEpochChan := make(chan *chainntnfs.BlockEpoch)
bobFirstEpoch := &chainntnfs.BlockEpochEvent{
Epochs: bobFirstEpochChan,
Cancel: func() {
},
}
firstBobTicker := time.NewTicker(50 * time.Millisecond)
firstBobChannelLink := NewChannelLink(
ChannelLinkConfig{
Switch: bobServer.htlcSwitch,
FwrdingPolicy: globalPolicy,
Peer: aliceServer,
Circuits: bobServer.htlcSwitch.CircuitModifier(),
ForwardPackets: bobServer.htlcSwitch.ForwardPackets,
DecodeHopIterators: bobDecoder.DecodeHopIterators,
ExtractErrorEncrypter: func(*btcec.PublicKey) (
ErrorEncrypter, lnwire.FailCode) {
return obfuscator, lnwire.CodeNone
},
FetchLastChannelUpdate: mockGetChanUpdateMessage,
Registry: bobServer.registry,
BlockEpochs: bobFirstEpoch,
FeeEstimator: feeEstimator,
PreimageCache: pCache,
UpdateContractSignals: func(*contractcourt.ContractSignals) error {
return nil
},
ChainEvents: &contractcourt.ChainEventSubscription{},
SyncStates: true,
BatchTicker: &mockTicker{firstBobTicker.C},
FwdPkgGCTicker: &mockTicker{time.NewTicker(5 * time.Second).C},
BatchSize: 10,
},
firstBobChannel,
startingHeight,
)
if err := bobServer.htlcSwitch.AddLink(firstBobChannelLink); err != nil {
t.Fatalf("unable to add first bob channel link: %v", err)
}
go func() {
for {
select {
case <-firstBobChannelLink.(*channelLink).htlcUpdates:
case <-firstBobChannelLink.(*channelLink).quit:
return
}
}
}()
bobSecondEpochChan := make(chan *chainntnfs.BlockEpoch)
bobSecondEpoch := &chainntnfs.BlockEpochEvent{
Epochs: bobSecondEpochChan,
Cancel: func() {
},
}
secondBobTicker := time.NewTicker(50 * time.Millisecond)
secondBobChannelLink := NewChannelLink(
ChannelLinkConfig{
Switch: bobServer.htlcSwitch,
FwrdingPolicy: globalPolicy,
Peer: carolServer,
Circuits: bobServer.htlcSwitch.CircuitModifier(),
ForwardPackets: bobServer.htlcSwitch.ForwardPackets,
DecodeHopIterators: bobDecoder.DecodeHopIterators,
ExtractErrorEncrypter: func(*btcec.PublicKey) (
ErrorEncrypter, lnwire.FailCode) {
return obfuscator, lnwire.CodeNone
},
FetchLastChannelUpdate: mockGetChanUpdateMessage,
Registry: bobServer.registry,
BlockEpochs: bobSecondEpoch,
FeeEstimator: feeEstimator,
PreimageCache: pCache,
UpdateContractSignals: func(*contractcourt.ContractSignals) error {
return nil
},
ChainEvents: &contractcourt.ChainEventSubscription{},
SyncStates: true,
BatchTicker: &mockTicker{secondBobTicker.C},
FwdPkgGCTicker: &mockTicker{time.NewTicker(5 * time.Second).C},
BatchSize: 10,
},
secondBobChannel,
startingHeight,
)
if err := bobServer.htlcSwitch.AddLink(secondBobChannelLink); err != nil {
t.Fatalf("unable to add second bob channel link: %v", err)
}
go func() {
for {
select {
case <-secondBobChannelLink.(*channelLink).htlcUpdates:
case <-secondBobChannelLink.(*channelLink).quit:
return
}
}
}()
carolBlockEpoch := make(chan *chainntnfs.BlockEpoch)
carolEpoch := &chainntnfs.BlockEpochEvent{
Epochs: bobSecondEpochChan,
Cancel: func() {
},
}
carolTicker := time.NewTicker(50 * time.Millisecond)
carolChannelLink := NewChannelLink(
ChannelLinkConfig{
Switch: carolServer.htlcSwitch,
FwrdingPolicy: globalPolicy,
Peer: bobServer,
Circuits: carolServer.htlcSwitch.CircuitModifier(),
ForwardPackets: carolServer.htlcSwitch.ForwardPackets,
DecodeHopIterators: carolDecoder.DecodeHopIterators,
ExtractErrorEncrypter: func(*btcec.PublicKey) (
ErrorEncrypter, lnwire.FailCode) {
return obfuscator, lnwire.CodeNone
},
FetchLastChannelUpdate: mockGetChanUpdateMessage,
Registry: carolServer.registry,
BlockEpochs: carolEpoch,
FeeEstimator: feeEstimator,
PreimageCache: pCache,
UpdateContractSignals: func(*contractcourt.ContractSignals) error {
return nil
},
ChainEvents: &contractcourt.ChainEventSubscription{},
SyncStates: true,
BatchTicker: &mockTicker{carolTicker.C},
FwdPkgGCTicker: &mockTicker{time.NewTicker(5 * time.Second).C},
BatchSize: 10,
},
carolChannel,
startingHeight,
)
if err := carolServer.htlcSwitch.AddLink(carolChannelLink); err != nil {
t.Fatalf("unable to add carol channel link: %v", err)
}
go func() {
for {
select {
case <-carolChannelLink.(*channelLink).htlcUpdates:
case <-carolChannelLink.(*channelLink).quit:
return
}
}
}()
return &threeHopNetwork{
aliceServer: aliceServer,
aliceChannelLink: aliceChannelLink.(*channelLink),
aliceBlockEpoch: aliceEpochChan,
aliceTicker: aliceTicker,
firstBobChannelLink: firstBobChannelLink.(*channelLink),
bobFirstBlockEpoch: bobFirstEpochChan,
firstBobTicker: firstBobTicker,
bobServer: bobServer,
secondBobChannelLink: secondBobChannelLink.(*channelLink),
bobSecondBlockEpoch: bobSecondEpochChan,
secondBobTicker: secondBobTicker,
carolChannelLink: carolChannelLink.(*channelLink),
carolServer: carolServer,
carolBlockEpoch: carolBlockEpoch,
carolTicker: carolTicker,
feeEstimator: feeEstimator,
globalPolicy: globalPolicy,
}
}