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a93736d21e
lnd.xprv/htlcswitch/link_test.go
practicalswift a93736d21e multi: comprehensive typo fixes across all packages
2018-02-06 19:11:11 -08:00

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package htlcswitch
import (
"bytes"
"fmt"
"runtime"
"strings"
"sync"
"testing"
"time"
"io"
"math"
"github.com/davecgh/go-spew/spew"
"github.com/go-errors/errors"
"github.com/lightningnetwork/lnd/chainntnfs"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/contractcourt"
"github.com/lightningnetwork/lnd/lnwallet"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/roasbeef/btcd/chaincfg/chainhash"
"github.com/roasbeef/btcd/wire"
"github.com/roasbeef/btcutil"
)
const (
testStartingHeight = 100
)
// concurrentTester is a thread-safe wrapper around the Fatalf method of a
// *testing.T instance. With this wrapper multiple goroutines can safely
// attempt to fail a test concurrently.
type concurrentTester struct {
mtx sync.Mutex
*testing.T
}
func newConcurrentTester(t *testing.T) *concurrentTester {
return &concurrentTester{
T: t,
}
}
func (c *concurrentTester) Fatalf(format string, args ...interface{}) {
c.mtx.Lock()
defer c.mtx.Unlock()
c.T.Fatalf(format, args)
}
// messageToString is used to produce less spammy log messages in trace mode by
// setting the 'Curve" parameter to nil. Doing this avoids printing out each of
// the field elements in the curve parameters for secp256k1.
func messageToString(msg lnwire.Message) string {
switch m := msg.(type) {
case *lnwire.RevokeAndAck:
m.NextRevocationKey.Curve = nil
case *lnwire.NodeAnnouncement:
m.NodeID.Curve = nil
case *lnwire.ChannelAnnouncement:
m.NodeID1.Curve = nil
m.NodeID2.Curve = nil
m.BitcoinKey1.Curve = nil
m.BitcoinKey2.Curve = nil
case *lnwire.AcceptChannel:
m.FundingKey.Curve = nil
m.RevocationPoint.Curve = nil
m.PaymentPoint.Curve = nil
m.DelayedPaymentPoint.Curve = nil
m.FirstCommitmentPoint.Curve = nil
case *lnwire.OpenChannel:
m.FundingKey.Curve = nil
m.RevocationPoint.Curve = nil
m.PaymentPoint.Curve = nil
m.DelayedPaymentPoint.Curve = nil
m.FirstCommitmentPoint.Curve = nil
case *lnwire.FundingLocked:
m.NextPerCommitmentPoint.Curve = nil
}
return spew.Sdump(msg)
}
// expectedMessage struct holds the message which travels from one peer to
// another, and additional information like, should this message we skipped for
// handling.
type expectedMessage struct {
from string
to string
message lnwire.Message
skip bool
}
// createLogFunc is a helper function which returns the function which will be
// used for logging message are received from another peer.
func createLogFunc(name string, channelID lnwire.ChannelID) messageInterceptor {
return func(m lnwire.Message) (bool, error) {
chanID, err := getChanID(m)
if err != nil {
return false, err
}
if chanID == channelID {
fmt.Printf("---------------------- \n %v received: "+
"%v", name, messageToString(m))
}
return false, nil
}
}
// createInterceptorFunc creates the function by the given set of messages
// which, checks the order of the messages and skip the ones which were
// indicated to be intercepted.
func createInterceptorFunc(prefix, receiver string, messages []expectedMessage,
chanID lnwire.ChannelID, debug bool) messageInterceptor {
// Filter message which should be received with given peer name.
var expectToReceive []expectedMessage
for _, message := range messages {
if message.to == receiver {
expectToReceive = append(expectToReceive, message)
}
}
// Return function which checks the message order and skip the
// messages.
return func(m lnwire.Message) (bool, error) {
messageChanID, err := getChanID(m)
if err != nil {
return false, err
}
if messageChanID == chanID {
if len(expectToReceive) == 0 {
return false, errors.Errorf("%v received "+
"unexpected message out of range: %v",
receiver, m.MsgType())
}
expectedMessage := expectToReceive[0]
expectToReceive = expectToReceive[1:]
if expectedMessage.message.MsgType() != m.MsgType() {
return false, errors.Errorf("%v received wrong message: \n"+
"real: %v\nexpected: %v", receiver, m.MsgType(),
expectedMessage.message.MsgType())
}
if debug {
var postfix string
if revocation, ok := m.(*lnwire.RevokeAndAck); ok {
var zeroHash chainhash.Hash
if bytes.Equal(zeroHash[:], revocation.Revocation[:]) {
postfix = "- empty revocation"
}
}
if expectedMessage.skip {
fmt.Printf("skipped: %v: %v %v \n", prefix,
m.MsgType(), postfix)
} else {
fmt.Printf("%v: %v %v \n", prefix, m.MsgType(), postfix)
}
}
return expectedMessage.skip, nil
}
return false, nil
}
}
// TestChannelLinkSingleHopPayment in this test we checks the interaction
// between Alice and Bob within scope of one channel.
func TestChannelLinkSingleHopPayment(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatal(err)
}
defer n.stop()
aliceBandwidthBefore := n.aliceChannelLink.Bandwidth()
bobBandwidthBefore := n.firstBobChannelLink.Bandwidth()
debug := false
if debug {
// Log message that alice receives.
n.aliceServer.intersect(createLogFunc("alice",
n.aliceChannelLink.ChanID()))
// Log message that bob receives.
n.bobServer.intersect(createLogFunc("bob",
n.firstBobChannelLink.ChanID()))
}
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
htlcAmt, totalTimelock, hops := generateHops(amount, testStartingHeight,
n.firstBobChannelLink)
// Wait for:
// * HTLC add request to be sent to bob.
// * alice<->bob commitment state to be updated.
// * settle request to be sent back from bob to alice.
// * alice<->bob commitment state to be updated.
// * user notification to be sent.
receiver := n.bobServer
rhash, err := n.makePayment(n.aliceServer, receiver,
n.bobServer.PubKey(), hops, amount, htlcAmt,
totalTimelock).Wait(30 * time.Second)
if err != nil {
t.Fatalf("unable to make the payment: %v", err)
}
// Wait for Bob to receive the revocation.
//
// TODO(roasbeef); replace with select over returned err chan
time.Sleep(100 * time.Millisecond)
// Check that alice invoice was settled and bandwidth of HTLC
// links was changed.
invoice, err := receiver.registry.LookupInvoice(rhash)
if err != nil {
t.Fatalf("unable to get invoice: %v", err)
}
if !invoice.Terms.Settled {
t.Fatal("alice invoice wasn't settled")
}
if aliceBandwidthBefore-amount != n.aliceChannelLink.Bandwidth() {
t.Fatal("alice bandwidth should have decrease on payment " +
"amount")
}
if bobBandwidthBefore+amount != n.firstBobChannelLink.Bandwidth() {
t.Fatalf("bob bandwidth isn't match: expected %v, got %v",
bobBandwidthBefore+amount,
n.firstBobChannelLink.Bandwidth())
}
}
// TestChannelLinkBidirectionalOneHopPayments tests the ability of channel
// link to cope with bigger number of payment updates that commitment
// transaction may consist.
func TestChannelLinkBidirectionalOneHopPayments(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatal(err)
}
defer n.stop()
bobBandwidthBefore := n.firstBobChannelLink.Bandwidth()
aliceBandwidthBefore := n.aliceChannelLink.Bandwidth()
debug := false
if debug {
// Log message that alice receives.
n.aliceServer.intersect(createLogFunc("alice",
n.aliceChannelLink.ChanID()))
// Log message that bob receives.
n.bobServer.intersect(createLogFunc("bob",
n.firstBobChannelLink.ChanID()))
}
amt := lnwire.NewMSatFromSatoshis(20000)
htlcAmt, totalTimelock, hopsForwards := generateHops(amt,
testStartingHeight, n.firstBobChannelLink)
_, _, hopsBackwards := generateHops(amt,
testStartingHeight, n.aliceChannelLink)
type result struct {
err error
start time.Time
number int
sender string
}
// Send max available payment number in both sides, thereby testing
// the property of channel link to cope with overflowing.
count := 2 * lnwallet.MaxHTLCNumber
resultChan := make(chan *result, count)
for i := 0; i < count/2; i++ {
go func(i int) {
r := &result{
start: time.Now(),
number: i,
sender: "alice",
}
_, r.err = n.makePayment(n.aliceServer, n.bobServer,
n.bobServer.PubKey(), hopsForwards, amt, htlcAmt,
totalTimelock).Wait(5 * time.Minute)
resultChan <- r
}(i)
}
for i := 0; i < count/2; i++ {
go func(i int) {
r := &result{
start: time.Now(),
number: i,
sender: "bob",
}
_, r.err = n.makePayment(n.bobServer, n.aliceServer,
n.aliceServer.PubKey(), hopsBackwards, amt, htlcAmt,
totalTimelock).Wait(5 * time.Minute)
resultChan <- r
}(i)
}
maxDelay := time.Duration(0)
minDelay := time.Duration(math.MaxInt64)
averageDelay := time.Duration(0)
// Check that alice invoice was settled and bandwidth of HTLC
// links was changed.
for i := 0; i < count; i++ {
select {
case r := <-resultChan:
if r.err != nil {
t.Fatalf("unable to make payment: %v", r.err)
}
delay := time.Since(r.start)
if delay > maxDelay {
maxDelay = delay
}
if delay < minDelay {
minDelay = delay
}
averageDelay += delay
case <-time.After(5 * time.Minute):
t.Fatalf("timeout: (%v/%v)", i+1, count)
}
}
// TODO(roasbeef): should instead consume async notifications from both
// links
time.Sleep(time.Second * 2)
// At the end Bob and Alice balances should be the same as previous,
// because they sent the equal amount of money to each other.
if aliceBandwidthBefore != n.aliceChannelLink.Bandwidth() {
t.Fatalf("alice bandwidth shouldn't have changed: expected %v, got %x",
aliceBandwidthBefore, n.aliceChannelLink.Bandwidth())
}
if bobBandwidthBefore != n.firstBobChannelLink.Bandwidth() {
t.Fatalf("bob bandwidth shouldn't have changed: expected %v, got %v",
bobBandwidthBefore, n.firstBobChannelLink.Bandwidth())
}
t.Logf("Max waiting: %v", maxDelay)
t.Logf("Min waiting: %v", minDelay)
t.Logf("Average waiting: %v", time.Duration(int(averageDelay)/count))
}
// TestChannelLinkMultiHopPayment checks the ability to send payment over two
// hops. In this test we send the payment from Carol to Alice over Bob peer.
// (Carol -> Bob -> Alice) and checking that HTLC was settled properly and
// balances were changed in two channels.
func TestChannelLinkMultiHopPayment(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatal(err)
}
defer n.stop()
carolBandwidthBefore := n.carolChannelLink.Bandwidth()
firstBobBandwidthBefore := n.firstBobChannelLink.Bandwidth()
secondBobBandwidthBefore := n.secondBobChannelLink.Bandwidth()
aliceBandwidthBefore := n.aliceChannelLink.Bandwidth()
debug := false
if debug {
// Log messages that alice receives from bob.
n.aliceServer.intersect(createLogFunc("[alice]<-bob<-carol: ",
n.aliceChannelLink.ChanID()))
// Log messages that bob receives from alice.
n.bobServer.intersect(createLogFunc("alice->[bob]->carol: ",
n.firstBobChannelLink.ChanID()))
// Log messages that bob receives from carol.
n.bobServer.intersect(createLogFunc("alice<-[bob]<-carol: ",
n.secondBobChannelLink.ChanID()))
// Log messages that carol receives from bob.
n.carolServer.intersect(createLogFunc("alice->bob->[carol]",
n.carolChannelLink.ChanID()))
}
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
htlcAmt, totalTimelock, hops := generateHops(amount,
testStartingHeight,
n.firstBobChannelLink, n.carolChannelLink)
// Wait for:
// * HTLC add request to be sent from Alice to Bob.
// * Alice<->Bob commitment states to be updated.
// * HTLC add request to be propagated to Carol.
// * Bob<->Carol commitment state to be updated.
// * settle request to be sent back from Carol to Bob.
// * Alice<->Bob commitment state to be updated.
// * settle request to be sent back from Bob to Alice.
// * Alice<->Bob commitment states to be updated.
// * user notification to be sent.
receiver := n.carolServer
rhash, err := n.makePayment(n.aliceServer, n.carolServer,
n.bobServer.PubKey(), hops, amount, htlcAmt,
totalTimelock).Wait(30 * time.Second)
if err != nil {
t.Fatalf("unable to send payment: %v", err)
}
// Wait for Bob to receive the revocation.
time.Sleep(100 * time.Millisecond)
// Check that Carol invoice was settled and bandwidth of HTLC
// links were changed.
invoice, err := receiver.registry.LookupInvoice(rhash)
if err != nil {
t.Fatalf("unable to get invoice: %v", err)
}
if !invoice.Terms.Settled {
t.Fatal("carol invoice haven't been settled")
}
expectedAliceBandwidth := aliceBandwidthBefore - htlcAmt
if expectedAliceBandwidth != n.aliceChannelLink.Bandwidth() {
t.Fatalf("channel bandwidth incorrect: expected %v, got %v",
expectedAliceBandwidth, n.aliceChannelLink.Bandwidth())
}
expectedBobBandwidth1 := firstBobBandwidthBefore + htlcAmt
if expectedBobBandwidth1 != n.firstBobChannelLink.Bandwidth() {
t.Fatalf("channel bandwidth incorrect: expected %v, got %v",
expectedBobBandwidth1, n.firstBobChannelLink.Bandwidth())
}
expectedBobBandwidth2 := secondBobBandwidthBefore - amount
if expectedBobBandwidth2 != n.secondBobChannelLink.Bandwidth() {
t.Fatalf("channel bandwidth incorrect: expected %v, got %v",
expectedBobBandwidth2, n.secondBobChannelLink.Bandwidth())
}
expectedCarolBandwidth := carolBandwidthBefore + amount
if expectedCarolBandwidth != n.carolChannelLink.Bandwidth() {
t.Fatalf("channel bandwidth incorrect: expected %v, got %v",
expectedCarolBandwidth, n.carolChannelLink.Bandwidth())
}
}
// TestExitNodeTimelockPayloadMismatch tests that when an exit node receives an
// incoming HTLC, if the time lock encoded in the payload of the forwarded HTLC
// doesn't match the expected payment value, then the HTLC will be rejected
// with the appropriate error.
func TestExitNodeTimelockPayloadMismatch(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*5,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatal(err)
}
defer n.stop()
const amount = btcutil.SatoshiPerBitcoin
htlcAmt, htlcExpiry, hops := generateHops(amount,
testStartingHeight, n.firstBobChannelLink)
// In order to exercise this case, we'll now _manually_ modify the
// per-hop payload for outgoing time lock to be the incorrect value.
// The proper value of the outgoing CLTV should be the policy set by
// the receiving node, instead we set it to be a random value.
hops[0].OutgoingCTLV = 500
_, err = n.makePayment(n.aliceServer, n.bobServer,
n.bobServer.PubKey(), hops, amount, htlcAmt,
htlcExpiry).Wait(30 * time.Second)
if err == nil {
t.Fatalf("payment should have failed but didn't")
}
ferr, ok := err.(*ForwardingError)
if !ok {
t.Fatalf("expected a ForwardingError, instead got: %T", err)
}
switch ferr.FailureMessage.(type) {
case *lnwire.FailFinalIncorrectCltvExpiry:
default:
t.Fatalf("incorrect error, expected incorrect cltv expiry, "+
"instead have: %v", err)
}
}
// TestExitNodeAmountPayloadMismatch tests that when an exit node receives an
// incoming HTLC, if the amount encoded in the onion payload of the forwarded
// HTLC doesn't match the expected payment value, then the HTLC will be
// rejected.
func TestExitNodeAmountPayloadMismatch(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*5,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatal(err)
}
defer n.stop()
const amount = btcutil.SatoshiPerBitcoin
htlcAmt, htlcExpiry, hops := generateHops(amount, testStartingHeight,
n.firstBobChannelLink)
// In order to exercise this case, we'll now _manually_ modify the
// per-hop payload for amount to be the incorrect value. The proper
// value of the amount to forward should be the amount that the
// receiving node expects to receive.
hops[0].AmountToForward = 1
_, err = n.makePayment(n.aliceServer, n.bobServer,
n.bobServer.PubKey(), hops, amount, htlcAmt,
htlcExpiry).Wait(30 * time.Second)
if err == nil {
t.Fatalf("payment should have failed but didn't")
} else if err.Error() != lnwire.CodeIncorrectPaymentAmount.String() {
// TODO(roasbeef): use proper error after error propagation is
// in
t.Fatalf("incorrect error, expected insufficient value, "+
"instead have: %v", err)
}
}
// TestLinkForwardTimelockPolicyMismatch tests that if a node is an
// intermediate node in a multi-hop payment, and receives an HTLC which
// violates its specified multi-hop policy, then the HTLC is rejected.
func TestLinkForwardTimelockPolicyMismatch(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*5,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatal(err)
}
defer n.stop()
// We'll be sending 1 BTC over a 2-hop (3 vertex) route.
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
// Generate the route over two hops, ignoring the total time lock that
// we'll need to use for the first HTLC in order to have a sufficient
// time-lock value to account for the decrements over the entire route.
htlcAmt, htlcExpiry, hops := generateHops(amount, testStartingHeight,
n.firstBobChannelLink, n.carolChannelLink)
htlcExpiry -= 2
// Next, we'll make the payment which'll send an HTLC with our
// specified parameters to the first hop in the route.
_, err = n.makePayment(n.aliceServer, n.carolServer,
n.bobServer.PubKey(), hops, amount, htlcAmt,
htlcExpiry).Wait(30 * time.Second)
// We should get an error, and that error should indicate that the HTLC
// should be rejected due to a policy violation.
if err == nil {
t.Fatalf("payment should have failed but didn't")
}
ferr, ok := err.(*ForwardingError)
if !ok {
t.Fatalf("expected a ForwardingError, instead got: %T", err)
}
switch ferr.FailureMessage.(type) {
case *lnwire.FailIncorrectCltvExpiry:
default:
t.Fatalf("incorrect error, expected incorrect cltv expiry, "+
"instead have: %v", err)
}
}
// TestLinkForwardTimelockPolicyMismatch tests that if a node is an
// intermediate node in a multi-hop payment and receives an HTLC that violates
// its current fee policy, then the HTLC is rejected with the proper error.
func TestLinkForwardFeePolicyMismatch(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatal(err)
}
defer n.stop()
// We'll be sending 1 BTC over a 2-hop (3 vertex) route. Given the
// current default fee of 1 SAT, if we just send a single BTC over in
// an HTLC, it should be rejected.
amountNoFee := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
// Generate the route over two hops, ignoring the amount we _should_
// actually send in order to be able to cover fees.
_, htlcExpiry, hops := generateHops(amountNoFee, testStartingHeight,
n.firstBobChannelLink, n.carolChannelLink)
// Next, we'll make the payment which'll send an HTLC with our
// specified parameters to the first hop in the route.
_, err = n.makePayment(n.aliceServer, n.bobServer,
n.bobServer.PubKey(), hops, amountNoFee, amountNoFee,
htlcExpiry).Wait(30 * time.Second)
// We should get an error, and that error should indicate that the HTLC
// should be rejected due to a policy violation.
if err == nil {
t.Fatalf("payment should have failed but didn't")
}
ferr, ok := err.(*ForwardingError)
if !ok {
t.Fatalf("expected a ForwardingError, instead got: %T", err)
}
switch ferr.FailureMessage.(type) {
case *lnwire.FailFeeInsufficient:
default:
t.Fatalf("incorrect error, expected fee insufficient, "+
"instead have: %T", err)
}
}
// TestLinkForwardFeePolicyMismatch tests that if a node is an intermediate
// node and receives an HTLC which is _below_ its min HTLC policy, then the
// HTLC will be rejected.
func TestLinkForwardMinHTLCPolicyMismatch(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*5,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatal(err)
}
defer n.stop()
// The current default global min HTLC policy set in the default config
// for the three-hop-network is 5 SAT. So in order to trigger this
// failure mode, we'll create an HTLC with 1 satoshi.
amountNoFee := lnwire.NewMSatFromSatoshis(1)
// With the amount set, we'll generate a route over 2 hops within the
// network that attempts to pay out our specified amount.
htlcAmt, htlcExpiry, hops := generateHops(amountNoFee, testStartingHeight,
n.firstBobChannelLink, n.carolChannelLink)
// Next, we'll make the payment which'll send an HTLC with our
// specified parameters to the first hop in the route.
_, err = n.makePayment(n.aliceServer, n.bobServer,
n.bobServer.PubKey(), hops, amountNoFee, htlcAmt,
htlcExpiry).Wait(30 * time.Second)
// We should get an error, and that error should indicate that the HTLC
// should be rejected due to a policy violation (below min HTLC).
if err == nil {
t.Fatalf("payment should have failed but didn't")
}
ferr, ok := err.(*ForwardingError)
if !ok {
t.Fatalf("expected a ForwardingError, instead got: %T", err)
}
switch ferr.FailureMessage.(type) {
case *lnwire.FailAmountBelowMinimum:
default:
t.Fatalf("incorrect error, expected amount below minimum, "+
"instead have: %v", err)
}
}
// TestUpdateForwardingPolicy tests that the forwarding policy for a link is
// able to be updated properly. We'll first create an HTLC that meets the
// specified policy, assert that it succeeds, update the policy (to invalidate
// the prior HTLC), and then ensure that the HTLC is rejected.
func TestUpdateForwardingPolicy(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*5,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatal(err)
}
defer n.stop()
carolBandwidthBefore := n.carolChannelLink.Bandwidth()
firstBobBandwidthBefore := n.firstBobChannelLink.Bandwidth()
secondBobBandwidthBefore := n.secondBobChannelLink.Bandwidth()
aliceBandwidthBefore := n.aliceChannelLink.Bandwidth()
amountNoFee := lnwire.NewMSatFromSatoshis(10)
htlcAmt, htlcExpiry, hops := generateHops(amountNoFee,
testStartingHeight,
n.firstBobChannelLink, n.carolChannelLink)
// First, send this 1 BTC payment over the three hops, the payment
// should succeed, and all balances should be updated accordingly.
payResp, err := n.makePayment(n.aliceServer, n.carolServer,
n.bobServer.PubKey(), hops, amountNoFee, htlcAmt,
htlcExpiry).Wait(30 * time.Second)
if err != nil {
t.Fatalf("unable to send payment: %v", err)
}
// Carol's invoice should now be shown as settled as the payment
// succeeded.
invoice, err := n.carolServer.registry.LookupInvoice(payResp)
if err != nil {
t.Fatalf("unable to get invoice: %v", err)
}
if !invoice.Terms.Settled {
t.Fatal("carol invoice haven't been settled")
}
expectedAliceBandwidth := aliceBandwidthBefore - htlcAmt
if expectedAliceBandwidth != n.aliceChannelLink.Bandwidth() {
t.Fatalf("channel bandwidth incorrect: expected %v, got %v",
expectedAliceBandwidth, n.aliceChannelLink.Bandwidth())
}
expectedBobBandwidth1 := firstBobBandwidthBefore + htlcAmt
if expectedBobBandwidth1 != n.firstBobChannelLink.Bandwidth() {
t.Fatalf("channel bandwidth incorrect: expected %v, got %v",
expectedBobBandwidth1, n.firstBobChannelLink.Bandwidth())
}
expectedBobBandwidth2 := secondBobBandwidthBefore - amountNoFee
if expectedBobBandwidth2 != n.secondBobChannelLink.Bandwidth() {
t.Fatalf("channel bandwidth incorrect: expected %v, got %v",
expectedBobBandwidth2, n.secondBobChannelLink.Bandwidth())
}
expectedCarolBandwidth := carolBandwidthBefore + amountNoFee
if expectedCarolBandwidth != n.carolChannelLink.Bandwidth() {
t.Fatalf("channel bandwidth incorrect: expected %v, got %v",
expectedCarolBandwidth, n.carolChannelLink.Bandwidth())
}
// Now we'll update Bob's policy to jack up his free rate to an extent
// that'll cause him to reject the same HTLC that we just sent.
//
// TODO(roasbeef): should implement grace period within link policy
// update logic
newPolicy := n.globalPolicy
newPolicy.BaseFee = lnwire.NewMSatFromSatoshis(1000)
n.firstBobChannelLink.UpdateForwardingPolicy(newPolicy)
// Next, we'll send the payment again, using the exact same per-hop
// payload for each node. This payment should fail as it wont' factor
// in Bob's new fee policy.
_, err = n.makePayment(n.aliceServer, n.carolServer,
n.bobServer.PubKey(), hops, amountNoFee, htlcAmt,
htlcExpiry).Wait(30 * time.Second)
if err == nil {
t.Fatalf("payment should've been rejected")
}
ferr, ok := err.(*ForwardingError)
if !ok {
t.Fatalf("expected a ForwardingError, instead got: %T", err)
}
switch ferr.FailureMessage.(type) {
case *lnwire.FailFeeInsufficient:
default:
t.Fatalf("expected FailFeeInsufficient instead got: %v", err)
}
}
// TestChannelLinkMultiHopInsufficientPayment checks that we receive error if
// bob<->alice channel has insufficient BTC capacity/bandwidth. In this test we
// send the payment from Carol to Alice over Bob peer. (Carol -> Bob -> Alice)
func TestChannelLinkMultiHopInsufficientPayment(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatalf("unable to start three hop network: %v", err)
}
defer n.stop()
carolBandwidthBefore := n.carolChannelLink.Bandwidth()
firstBobBandwidthBefore := n.firstBobChannelLink.Bandwidth()
secondBobBandwidthBefore := n.secondBobChannelLink.Bandwidth()
aliceBandwidthBefore := n.aliceChannelLink.Bandwidth()
// We'll attempt to send 4 BTC although the alice-to-bob channel only
// has 3 BTC total capacity. As a result, this payment should be
// rejected.
amount := lnwire.NewMSatFromSatoshis(4 * btcutil.SatoshiPerBitcoin)
htlcAmt, totalTimelock, hops := generateHops(amount, testStartingHeight,
n.firstBobChannelLink, n.carolChannelLink)
// Wait for:
// * HTLC add request to be sent to from Alice to Bob.
// * Alice<->Bob commitment states to be updated.
// * Bob trying to add HTLC add request in Bob<->Carol channel.
// * Cancel HTLC request to be sent back from Bob to Alice.
// * user notification to be sent.
receiver := n.carolServer
rhash, err := n.makePayment(n.aliceServer, n.carolServer,
n.bobServer.PubKey(), hops, amount, htlcAmt,
totalTimelock).Wait(30 * time.Second)
if err == nil {
t.Fatal("error haven't been received")
} else if !strings.Contains(err.Error(), "insufficient capacity") {
t.Fatalf("wrong error has been received: %v", err)
}
// Wait for Alice to receive the revocation.
//
// TODO(roasbeef): add in ntfn hook for state transition completion
time.Sleep(100 * time.Millisecond)
// Check that alice invoice wasn't settled and bandwidth of htlc
// links hasn't been changed.
invoice, err := receiver.registry.LookupInvoice(rhash)
if err != nil {
t.Fatalf("unable to get invoice: %v", err)
}
if invoice.Terms.Settled {
t.Fatal("carol invoice have been settled")
}
if n.aliceChannelLink.Bandwidth() != aliceBandwidthBefore {
t.Fatal("the bandwidth of alice channel link which handles " +
"alice->bob channel should be the same")
}
if n.firstBobChannelLink.Bandwidth() != firstBobBandwidthBefore {
t.Fatal("the bandwidth of bob channel link which handles " +
"alice->bob channel should be the same")
}
if n.secondBobChannelLink.Bandwidth() != secondBobBandwidthBefore {
t.Fatal("the bandwidth of bob channel link which handles " +
"bob->carol channel should be the same")
}
if n.carolChannelLink.Bandwidth() != carolBandwidthBefore {
t.Fatal("the bandwidth of carol channel link which handles " +
"bob->carol channel should be the same")
}
}
// TestChannelLinkMultiHopUnknownPaymentHash checks that we receive remote error
// from Alice if she received not suitable payment hash for htlc.
func TestChannelLinkMultiHopUnknownPaymentHash(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*5,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatalf("unable to start three hop network: %v", err)
}
defer n.stop()
carolBandwidthBefore := n.carolChannelLink.Bandwidth()
firstBobBandwidthBefore := n.firstBobChannelLink.Bandwidth()
secondBobBandwidthBefore := n.secondBobChannelLink.Bandwidth()
aliceBandwidthBefore := n.aliceChannelLink.Bandwidth()
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
htlcAmt, totalTimelock, hops := generateHops(amount, testStartingHeight,
n.firstBobChannelLink, n.carolChannelLink)
blob, err := generateRoute(hops...)
if err != nil {
t.Fatal(err)
}
// Generate payment: invoice and htlc.
invoice, htlc, err := generatePayment(amount, htlcAmt, totalTimelock,
blob)
if err != nil {
t.Fatal(err)
}
// We need to have wrong rhash for that reason we should change the
// preimage. Inverse first byte by xoring with 0xff.
invoice.Terms.PaymentPreimage[0] ^= byte(255)
// Check who is last in the route and add invoice to server registry.
if err := n.carolServer.registry.AddInvoice(*invoice); err != nil {
t.Fatalf("unable to add invoice in carol registry: %v", err)
}
// Send payment and expose err channel.
_, err = n.aliceServer.htlcSwitch.SendHTLC(n.bobServer.PubKey(), htlc,
newMockDeobfuscator())
if err.Error() != lnwire.CodeUnknownPaymentHash.String() {
t.Fatal("error haven't been received")
}
// Wait for Alice to receive the revocation.
time.Sleep(100 * time.Millisecond)
// Check that alice invoice wasn't settled and bandwidth of htlc
// links hasn't been changed.
if invoice.Terms.Settled {
t.Fatal("alice invoice was settled")
}
if n.aliceChannelLink.Bandwidth() != aliceBandwidthBefore {
t.Fatal("the bandwidth of alice channel link which handles " +
"alice->bob channel should be the same")
}
if n.firstBobChannelLink.Bandwidth() != firstBobBandwidthBefore {
t.Fatal("the bandwidth of bob channel link which handles " +
"alice->bob channel should be the same")
}
if n.secondBobChannelLink.Bandwidth() != secondBobBandwidthBefore {
t.Fatal("the bandwidth of bob channel link which handles " +
"bob->carol channel should be the same")
}
if n.carolChannelLink.Bandwidth() != carolBandwidthBefore {
t.Fatal("the bandwidth of carol channel link which handles " +
"bob->carol channel should be the same")
}
}
// TestChannelLinkMultiHopUnknownNextHop construct the chain of hops
// Carol<->Bob<->Alice and checks that we receive remote error from Bob if he
// has no idea about next hop (hop might goes down and routing info not updated
// yet).
func TestChannelLinkMultiHopUnknownNextHop(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*5,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatal(err)
}
defer n.stop()
carolBandwidthBefore := n.carolChannelLink.Bandwidth()
firstBobBandwidthBefore := n.firstBobChannelLink.Bandwidth()
secondBobBandwidthBefore := n.secondBobChannelLink.Bandwidth()
aliceBandwidthBefore := n.aliceChannelLink.Bandwidth()
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
htlcAmt, totalTimelock, hops := generateHops(amount, testStartingHeight,
n.firstBobChannelLink, n.carolChannelLink)
davePub := newMockServer(t, "dave").PubKey()
receiver := n.bobServer
rhash, err := n.makePayment(n.aliceServer, n.bobServer, davePub, hops,
amount, htlcAmt, totalTimelock).Wait(30 * time.Second)
if err == nil {
t.Fatal("error haven't been received")
} else if err.Error() != lnwire.CodeUnknownNextPeer.String() {
t.Fatalf("wrong error have been received: %v", err)
}
// Wait for Alice to receive the revocation.
//
// TODO(roasbeef): add in ntfn hook for state transition completion
time.Sleep(100 * time.Millisecond)
// Check that alice invoice wasn't settled and bandwidth of htlc
// links hasn't been changed.
invoice, err := receiver.registry.LookupInvoice(rhash)
if err != nil {
t.Fatalf("unable to get invoice: %v", err)
}
if invoice.Terms.Settled {
t.Fatal("carol invoice have been settled")
}
if n.aliceChannelLink.Bandwidth() != aliceBandwidthBefore {
t.Fatal("the bandwidth of alice channel link which handles " +
"alice->bob channel should be the same")
}
if n.firstBobChannelLink.Bandwidth() != firstBobBandwidthBefore {
t.Fatal("the bandwidth of bob channel link which handles " +
"alice->bob channel should be the same")
}
if n.secondBobChannelLink.Bandwidth() != secondBobBandwidthBefore {
t.Fatal("the bandwidth of bob channel link which handles " +
"bob->carol channel should be the same")
}
if n.carolChannelLink.Bandwidth() != carolBandwidthBefore {
t.Fatal("the bandwidth of carol channel link which handles " +
"bob->carol channel should be the same")
}
}
// TestChannelLinkMultiHopDecodeError checks that we send HTLC cancel if
// decoding of onion blob failed.
func TestChannelLinkMultiHopDecodeError(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatalf("unable to start three hop network: %v", err)
}
defer n.stop()
// Replace decode function with another which throws an error.
n.carolChannelLink.cfg.DecodeOnionObfuscator = func(
r io.Reader) (ErrorEncrypter, lnwire.FailCode) {
return nil, lnwire.CodeInvalidOnionVersion
}
carolBandwidthBefore := n.carolChannelLink.Bandwidth()
firstBobBandwidthBefore := n.firstBobChannelLink.Bandwidth()
secondBobBandwidthBefore := n.secondBobChannelLink.Bandwidth()
aliceBandwidthBefore := n.aliceChannelLink.Bandwidth()
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
htlcAmt, totalTimelock, hops := generateHops(amount, testStartingHeight,
n.firstBobChannelLink, n.carolChannelLink)
receiver := n.carolServer
rhash, err := n.makePayment(n.aliceServer, n.carolServer,
n.bobServer.PubKey(), hops, amount, htlcAmt,
totalTimelock).Wait(30 * time.Second)
if err == nil {
t.Fatal("error haven't been received")
}
ferr, ok := err.(*ForwardingError)
if !ok {
t.Fatalf("expected a ForwardingError, instead got: %T", err)
}
switch ferr.FailureMessage.(type) {
case *lnwire.FailInvalidOnionVersion:
default:
t.Fatalf("wrong error have been received: %v", err)
}
// Wait for Bob to receive the revocation.
time.Sleep(100 * time.Millisecond)
// Check that alice invoice wasn't settled and bandwidth of htlc
// links hasn't been changed.
invoice, err := receiver.registry.LookupInvoice(rhash)
if err != nil {
t.Fatalf("unable to get invoice: %v", err)
}
if invoice.Terms.Settled {
t.Fatal("carol invoice have been settled")
}
if n.aliceChannelLink.Bandwidth() != aliceBandwidthBefore {
t.Fatal("the bandwidth of alice channel link which handles " +
"alice->bob channel should be the same")
}
if n.firstBobChannelLink.Bandwidth() != firstBobBandwidthBefore {
t.Fatal("the bandwidth of bob channel link which handles " +
"alice->bob channel should be the same")
}
if n.secondBobChannelLink.Bandwidth() != secondBobBandwidthBefore {
t.Fatal("the bandwidth of bob channel link which handles " +
"bob->carol channel should be the same")
}
if n.carolChannelLink.Bandwidth() != carolBandwidthBefore {
t.Fatal("the bandwidth of carol channel link which handles " +
"bob->carol channel should be the same")
}
}
// TestChannelLinkExpiryTooSoonExitNode tests that if we send an HTLC to a node
// with an expiry that is already expired, or too close to the current block
// height, then it will cancel the HTLC.
func TestChannelLinkExpiryTooSoonExitNode(t *testing.T) {
t.Parallel()
// The starting height for this test will be 200. So we'll base all
// HTLC starting points off of that.
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
const startingHeight = 200
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, startingHeight)
if err := n.start(); err != nil {
t.Fatalf("unable to start three hop network: %v", err)
}
defer n.stop()
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
// We'll craft an HTLC packet, but set the starting height to 10 blocks
// before the current true height.
htlcAmt, totalTimelock, hops := generateHops(amount,
startingHeight-10, n.firstBobChannelLink)
// Now we'll send out the payment from Alice to Bob.
_, err = n.makePayment(n.aliceServer, n.bobServer,
n.bobServer.PubKey(), hops, amount, htlcAmt,
totalTimelock).Wait(30 * time.Second)
// The payment should've failed as the time lock value was in the
// _past_.
if err == nil {
t.Fatalf("payment should have failed due to a too early " +
"time lock value")
}
ferr, ok := err.(*ForwardingError)
if !ok {
t.Fatalf("expected a ForwardingError, instead got: %T %v",
err, err)
}
switch ferr.FailureMessage.(type) {
case *lnwire.FailFinalIncorrectCltvExpiry:
default:
t.Fatalf("incorrect error, expected final time lock too "+
"early, instead have: %v", err)
}
}
// TestChannelLinkExpiryTooSoonExitNode tests that if we send a multi-hop HTLC,
// and the time lock is too early for an intermediate node, then they cancel
// the HTLC back to the sender.
func TestChannelLinkExpiryTooSoonMidNode(t *testing.T) {
t.Parallel()
// The starting height for this test will be 200. So we'll base all
// HTLC starting points off of that.
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
const startingHeight = 200
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, startingHeight)
if err := n.start(); err != nil {
t.Fatalf("unable to start three hop network: %v", err)
}
defer n.stop()
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
// We'll craft an HTLC packet, but set the starting height to 10 blocks
// before the current true height. The final route will be three hops,
// so the middle hop should detect the issue.
htlcAmt, totalTimelock, hops := generateHops(amount,
startingHeight-10, n.firstBobChannelLink, n.carolChannelLink)
// Now we'll send out the payment from Alice to Bob.
_, err = n.makePayment(n.aliceServer, n.bobServer,
n.bobServer.PubKey(), hops, amount, htlcAmt,
totalTimelock).Wait(30 * time.Second)
// The payment should've failed as the time lock value was in the
// _past_.
if err == nil {
t.Fatalf("payment should have failed due to a too early " +
"time lock value")
}
ferr, ok := err.(*ForwardingError)
if !ok {
t.Fatalf("expected a ForwardingError, instead got: %T: %v", err, err)
}
switch ferr.FailureMessage.(type) {
case *lnwire.FailExpiryTooSoon:
default:
t.Fatalf("incorrect error, expected final time lock too "+
"early, instead have: %v", err)
}
}
// TestChannelLinkSingleHopMessageOrdering test checks ordering of message which
// flying around between Alice and Bob are correct when Bob sends payments to
// Alice.
func TestChannelLinkSingleHopMessageOrdering(t *testing.T) {
t.Parallel()
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
chanID := n.aliceChannelLink.ChanID()
messages := []expectedMessage{
{"alice", "bob", &lnwire.ChannelReestablish{}, false},
{"bob", "alice", &lnwire.ChannelReestablish{}, false},
{"alice", "bob", &lnwire.FundingLocked{}, false},
{"bob", "alice", &lnwire.FundingLocked{}, false},
{"alice", "bob", &lnwire.UpdateAddHTLC{}, false},
{"alice", "bob", &lnwire.CommitSig{}, false},
{"bob", "alice", &lnwire.RevokeAndAck{}, false},
{"bob", "alice", &lnwire.CommitSig{}, false},
{"alice", "bob", &lnwire.RevokeAndAck{}, false},
{"bob", "alice", &lnwire.UpdateFulfillHTLC{}, false},
{"bob", "alice", &lnwire.CommitSig{}, false},
{"alice", "bob", &lnwire.RevokeAndAck{}, false},
{"alice", "bob", &lnwire.CommitSig{}, false},
{"bob", "alice", &lnwire.RevokeAndAck{}, false},
}
debug := false
if debug {
// Log message that alice receives.
n.aliceServer.intersect(createLogFunc("alice",
n.aliceChannelLink.ChanID()))
// Log message that bob receives.
n.bobServer.intersect(createLogFunc("bob",
n.firstBobChannelLink.ChanID()))
}
// Check that alice receives messages in right order.
n.aliceServer.intersect(createInterceptorFunc("[alice] <-- [bob]",
"alice", messages, chanID, false))
// Check that bob receives messages in right order.
n.bobServer.intersect(createInterceptorFunc("[alice] --> [bob]",
"bob", messages, chanID, false))
if err := n.start(); err != nil {
t.Fatalf("unable to start three hop network: %v", err)
}
defer n.stop()
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
htlcAmt, totalTimelock, hops := generateHops(amount, testStartingHeight,
n.firstBobChannelLink)
// Wait for:
// * HTLC add request to be sent to bob.
// * alice<->bob commitment state to be updated.
// * settle request to be sent back from bob to alice.
// * alice<->bob commitment state to be updated.
// * user notification to be sent.
_, err = n.makePayment(n.aliceServer, n.bobServer,
n.bobServer.PubKey(), hops, amount, htlcAmt,
totalTimelock).Wait(30 * time.Second)
if err != nil {
t.Fatalf("unable to make the payment: %v", err)
}
}
type mockPeer struct {
sync.Mutex
sentMsgs chan lnwire.Message
quit chan struct{}
}
func (m *mockPeer) SendMessage(msg lnwire.Message) error {
select {
case m.sentMsgs <- msg:
case <-m.quit:
return fmt.Errorf("mockPeer shutting down")
}
return nil
}
func (m *mockPeer) WipeChannel(*wire.OutPoint) error {
return nil
}
func (m *mockPeer) PubKey() [33]byte {
return [33]byte{}
}
func (m *mockPeer) Disconnect(reason error) {
}
var _ Peer = (*mockPeer)(nil)
func newSingleLinkTestHarness(chanAmt btcutil.Amount) (ChannelLink,
*lnwallet.LightningChannel, chan time.Time, func(), error) {
globalEpoch := &chainntnfs.BlockEpochEvent{
Epochs: make(chan *chainntnfs.BlockEpoch),
Cancel: func() {
},
}
chanID := lnwire.NewShortChanIDFromInt(4)
aliceChannel, bobChannel, fCleanUp, _, err := createTestChannel(
alicePrivKey, bobPrivKey, chanAmt, chanAmt, chanID,
)
if err != nil {
return nil, nil, nil, nil, err
}
var (
invoiceRegistry = newMockRegistry()
decoder = &mockIteratorDecoder{}
obfuscator = newMockObfuscator()
alicePeer = &mockPeer{
sentMsgs: make(chan lnwire.Message, 2000),
quit: make(chan struct{}),
}
globalPolicy = ForwardingPolicy{
MinHTLC: lnwire.NewMSatFromSatoshis(5),
BaseFee: lnwire.NewMSatFromSatoshis(1),
TimeLockDelta: 6,
}
)
pCache := &mockPreimageCache{
// hash -> preimage
preimageMap: make(map[[32]byte][]byte),
}
t := make(chan time.Time)
ticker := &mockTicker{t}
aliceCfg := ChannelLinkConfig{
FwrdingPolicy: globalPolicy,
Peer: alicePeer,
Switch: New(Config{}),
DecodeHopIterator: decoder.DecodeHopIterator,
DecodeOnionObfuscator: func(io.Reader) (ErrorEncrypter, lnwire.FailCode) {
return obfuscator, lnwire.CodeNone
},
GetLastChannelUpdate: mockGetChanUpdateMessage,
PreimageCache: pCache,
UpdateContractSignals: func(*contractcourt.ContractSignals) error {
return nil
},
Registry: invoiceRegistry,
ChainEvents: &contractcourt.ChainEventSubscription{},
BlockEpochs: globalEpoch,
BatchTicker: ticker,
// Make the BatchSize large enough to not
// trigger commit update automatically during tests.
BatchSize: 10000,
}
const startingHeight = 100
aliceLink := NewChannelLink(aliceCfg, aliceChannel, startingHeight)
if err := aliceLink.Start(); err != nil {
return nil, nil, nil, nil, err
}
go func() {
for {
select {
case <-aliceLink.(*channelLink).htlcUpdates:
case <-aliceLink.(*channelLink).quit:
return
}
}
}()
cleanUp := func() {
close(alicePeer.quit)
defer fCleanUp()
defer aliceLink.Stop()
defer bobChannel.Stop()
}
return aliceLink, bobChannel, t, cleanUp, nil
}
func assertLinkBandwidth(t *testing.T, link ChannelLink,
expected lnwire.MilliSatoshi) {
currentBandwidth := link.Bandwidth()
_, _, line, _ := runtime.Caller(1)
if currentBandwidth != expected {
t.Fatalf("line %v: alice's link bandwidth is incorrect: "+
"expected %v, got %v", line, expected, currentBandwidth)
}
}
// handleStateUpdate handles the messages sent from the link after
// the batch ticker has triggered a state update.
func handleStateUpdate(link *channelLink,
remoteChannel *lnwallet.LightningChannel) error {
sentMsgs := link.cfg.Peer.(*mockPeer).sentMsgs
var msg lnwire.Message
select {
case msg = <-sentMsgs:
case <-time.After(20 * time.Second):
return fmt.Errorf("did not receive CommitSig from Alice")
}
// The link should be sending a commit sig at this point.
commitSig, ok := msg.(*lnwire.CommitSig)
if !ok {
return fmt.Errorf("expected CommitSig, got %T", msg)
}
// Let the remote channel receive the commit sig, and
// respond with a revocation + commitsig.
err := remoteChannel.ReceiveNewCommitment(
commitSig.CommitSig, commitSig.HtlcSigs)
if err != nil {
return err
}
remoteRev, _, err := remoteChannel.RevokeCurrentCommitment()
if err != nil {
return err
}
link.HandleChannelUpdate(remoteRev)
remoteSig, remoteHtlcSigs, err := remoteChannel.SignNextCommitment()
if err != nil {
return err
}
commitSig = &lnwire.CommitSig{
CommitSig: remoteSig,
HtlcSigs: remoteHtlcSigs,
}
link.HandleChannelUpdate(commitSig)
// This should make the link respond with a revocation.
select {
case msg = <-sentMsgs:
case <-time.After(20 * time.Second):
return fmt.Errorf("did not receive RevokeAndAck from Alice")
}
revoke, ok := msg.(*lnwire.RevokeAndAck)
if !ok {
return fmt.Errorf("expected RevokeAndAck got %T", msg)
}
_, err = remoteChannel.ReceiveRevocation(revoke)
if err != nil {
return fmt.Errorf("unable to recieve "+
"revocation: %v", err)
}
return nil
}
// updateState is used exchange the messages necessary to do a full state
// transition. If initiateUpdate=true, then this call will make the link
// trigger an update by sending on the batchTick channel, if not, it will
// make the remoteChannel initiate the state update.
func updateState(batchTick chan time.Time, link *channelLink,
remoteChannel *lnwallet.LightningChannel,
initiateUpdate bool) error {
sentMsgs := link.cfg.Peer.(*mockPeer).sentMsgs
if initiateUpdate {
// Trigger update by ticking the batchTicker.
select {
case batchTick <- time.Now():
case <-link.quit:
return fmt.Errorf("link shuttin down")
}
return handleStateUpdate(link, remoteChannel)
}
// The remote is triggering the state update, emulate this by
// signing and sending CommitSig to the link.
remoteSig, remoteHtlcSigs, err := remoteChannel.SignNextCommitment()
if err != nil {
return err
}
commitSig := &lnwire.CommitSig{
CommitSig: remoteSig,
HtlcSigs: remoteHtlcSigs,
}
link.HandleChannelUpdate(commitSig)
// The link should respond with a revocation + commit sig.
var msg lnwire.Message
select {
case msg = <-sentMsgs:
case <-time.After(20 * time.Second):
return fmt.Errorf("did not receive RevokeAndAck from Alice")
}
revoke, ok := msg.(*lnwire.RevokeAndAck)
if !ok {
return fmt.Errorf("expected RevokeAndAck got %T",
msg)
}
_, err = remoteChannel.ReceiveRevocation(revoke)
if err != nil {
return fmt.Errorf("unable to recieve "+
"revocation: %v", err)
}
select {
case msg = <-sentMsgs:
case <-time.After(20 * time.Second):
return fmt.Errorf("did not receive CommitSig from Alice")
}
commitSig, ok = msg.(*lnwire.CommitSig)
if !ok {
return fmt.Errorf("expected CommitSig, got %T", msg)
}
err = remoteChannel.ReceiveNewCommitment(
commitSig.CommitSig, commitSig.HtlcSigs)
if err != nil {
return err
}
// Lastly, send a revocation back to the link.
remoteRev, _, err := remoteChannel.RevokeCurrentCommitment()
if err != nil {
return err
}
link.HandleChannelUpdate(remoteRev)
// Sleep to make sure Alice has handled the remote revocation.
time.Sleep(500 * time.Millisecond)
return nil
}
// TestChannelLinkBandwidthConsistency ensures that the reported bandwidth of a
// given ChannelLink is properly updated in response to downstream messages
// from the switch, and upstream messages from its channel peer.
//
// TODO(roasbeef): add sync hook into packet processing so can eliminate all
// sleep in this test and the one below
func TestChannelLinkBandwidthConsistency(t *testing.T) {
t.Parallel()
// TODO(roasbeef): replace manual bit twiddling with concept of
// resource cost for packets?
// * or also able to consult link
// We'll start the test by creating a single instance of
const chanAmt = btcutil.SatoshiPerBitcoin * 5
link, bobChannel, tmr, cleanUp, err := newSingleLinkTestHarness(chanAmt)
if err != nil {
t.Fatalf("unable to create link: %v", err)
}
defer cleanUp()
var (
mockBlob [lnwire.OnionPacketSize]byte
aliceLink = link.(*channelLink)
aliceChannel = aliceLink.channel
defaultCommitFee = aliceChannel.StateSnapshot().CommitFee
aliceStartingBandwidth = aliceLink.Bandwidth()
aliceMsgs = aliceLink.cfg.Peer.(*mockPeer).sentMsgs
)
// We put Alice into HodlHTLC mode, such that she won't settle
// incoming HTLCs automatically.
aliceLink.cfg.HodlHTLC = true
aliceLink.cfg.DebugHTLC = true
estimator := &lnwallet.StaticFeeEstimator{
FeeRate: 24,
}
feePerWeight, err := estimator.EstimateFeePerWeight(1)
if err != nil {
t.Fatalf("unable to query fee estimator: %v", err)
}
feePerKw := feePerWeight * 1000
htlcFee := lnwire.NewMSatFromSatoshis(
btcutil.Amount((int64(feePerKw) * lnwallet.HtlcWeight) / 1000),
)
// The starting bandwidth of the channel should be exactly the amount
// that we created the channel between her and Bob.
expectedBandwidth := lnwire.NewMSatFromSatoshis(chanAmt - defaultCommitFee)
assertLinkBandwidth(t, aliceLink, expectedBandwidth)
// Next, we'll create an HTLC worth 1 BTC, and send it into the link as
// a switch initiated payment. The resulting bandwidth should
// now be decremented to reflect the new HTLC.
htlcAmt := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
invoice, htlc, err := generatePayment(htlcAmt, htlcAmt, 5, mockBlob)
if err != nil {
t.Fatalf("unable to create payment: %v", err)
}
addPkt := htlcPacket{
htlc: htlc,
}
aliceLink.HandleSwitchPacket(&addPkt)
time.Sleep(time.Millisecond * 500)
// The resulting bandwidth should reflect that Alice is paying the
// htlc amount in addition to the htlc fee.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth-htlcAmt-htlcFee)
// Alice should send the HTLC to Bob.
var msg lnwire.Message
select {
case msg = <-aliceMsgs:
case <-time.After(2 * time.Second):
t.Fatalf("did not receive message")
}
addHtlc, ok := msg.(*lnwire.UpdateAddHTLC)
if !ok {
t.Fatalf("expected UpdateAddHTLC, got %T", msg)
}
bobIndex, err := bobChannel.ReceiveHTLC(addHtlc)
if err != nil {
t.Fatalf("bob failed receiving htlc: %v", err)
}
// Lock in the HTLC.
if err := updateState(tmr, aliceLink, bobChannel, true); err != nil {
t.Fatalf("unable to update state: %v", err)
}
// Locking in the HTLC should not change Alice's bandwidth.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth-htlcAmt-htlcFee)
// If we now send in a valid HTLC settle for the prior HTLC we added,
// then the bandwidth should remain unchanged as the remote party will
// gain additional channel balance.
err = bobChannel.SettleHTLC(invoice.Terms.PaymentPreimage, bobIndex)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
htlcSettle := &lnwire.UpdateFulfillHTLC{
ID: bobIndex,
PaymentPreimage: invoice.Terms.PaymentPreimage,
}
aliceLink.HandleChannelUpdate(htlcSettle)
time.Sleep(time.Millisecond * 500)
// Since the settle is not locked in yet, Alice's bandwidth should still
// reflect that she has to pay the fee.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth-htlcAmt-htlcFee)
// Lock in the settle.
if err := updateState(tmr, aliceLink, bobChannel, false); err != nil {
t.Fatalf("unable to update state: %v", err)
}
// Now that it is settled, Alice should have gotten the htlc fee back.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth-htlcAmt)
// Next, we'll add another HTLC initiated by the switch (of the same
// amount as the prior one).
invoice, htlc, err = generatePayment(htlcAmt, htlcAmt, 5, mockBlob)
if err != nil {
t.Fatalf("unable to create payment: %v", err)
}
addPkt = htlcPacket{
htlc: htlc,
}
aliceLink.HandleSwitchPacket(&addPkt)
time.Sleep(time.Millisecond * 500)
// Again, Alice's bandwidth decreases by htlcAmt+htlcFee.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth-2*htlcAmt-htlcFee)
// Alice will send the HTLC to Bob.
select {
case msg = <-aliceMsgs:
case <-time.After(2 * time.Second):
t.Fatalf("did not receive message")
}
addHtlc, ok = msg.(*lnwire.UpdateAddHTLC)
if !ok {
t.Fatalf("expected UpdateAddHTLC, got %T", msg)
}
bobIndex, err = bobChannel.ReceiveHTLC(addHtlc)
if err != nil {
t.Fatalf("bob failed receiving htlc: %v", err)
}
// Lock in the HTLC, which should not affect the bandwidth.
if err := updateState(tmr, aliceLink, bobChannel, true); err != nil {
t.Fatalf("unable to update state: %v", err)
}
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth-htlcAmt*2-htlcFee)
// With that processed, we'll now generate an HTLC fail (sent by the
// remote peer) to cancel the HTLC we just added. This should return us
// back to the bandwidth of the link right before the HTLC was sent.
err = bobChannel.FailHTLC(bobIndex, []byte("nop"))
if err != nil {
t.Fatalf("unable to fail htlc: %v", err)
}
failMsg := &lnwire.UpdateFailHTLC{
ID: bobIndex,
Reason: lnwire.OpaqueReason([]byte("nop")),
}
aliceLink.HandleChannelUpdate(failMsg)
time.Sleep(time.Millisecond * 500)
// Before the Fail gets locked in, the bandwidth should remain unchanged.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth-htlcAmt*2-htlcFee)
// Lock in the Fail.
if err := updateState(tmr, aliceLink, bobChannel, false); err != nil {
t.Fatalf("unable to update state: %v", err)
}
// Now the bancdwidth should reflect the failed HTLC.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth-htlcAmt)
// Moving along, we'll now receive a new HTLC from the remote peer,
// with an ID of 0 as this is their first HTLC. The bandwidth should
// remain unchanged (but Alice will need to pay the fee for the extra
// HTLC).
htlcAmt, totalTimelock, hops := generateHops(htlcAmt, testStartingHeight,
aliceLink)
blob, err := generateRoute(hops...)
if err != nil {
t.Fatalf("unable to gen route: %v", err)
}
invoice, htlc, err = generatePayment(htlcAmt, htlcAmt,
totalTimelock, blob)
if err != nil {
t.Fatalf("unable to create payment: %v", err)
}
// We must add the invoice to the registry, such that Alice expects
// this payment.
err = aliceLink.cfg.Registry.(*mockInvoiceRegistry).AddInvoice(*invoice)
if err != nil {
t.Fatalf("unable to add invoice to registry: %v", err)
}
bobIndex, err = bobChannel.AddHTLC(htlc)
if err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
aliceLink.HandleChannelUpdate(htlc)
// Alice's balance remains unchanged until this HTLC is locked in.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth-htlcAmt)
// Lock in the HTLC.
if err := updateState(tmr, aliceLink, bobChannel, false); err != nil {
t.Fatalf("unable to update state: %v", err)
}
// Since Bob is adding this HTLC, Alice only needs to pay the fee.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth-htlcAmt-htlcFee)
// Next, we'll settle the HTLC with our knowledge of the pre-image that
// we eventually learn (simulating a multi-hop payment). The bandwidth
// of the channel should now be re-balanced to the starting point.
settlePkt := htlcPacket{
htlc: &lnwire.UpdateFulfillHTLC{
ID: bobIndex,
PaymentPreimage: invoice.Terms.PaymentPreimage,
},
}
aliceLink.HandleSwitchPacket(&settlePkt)
time.Sleep(time.Millisecond * 500)
// Settling this HTLC gives Alice all her original bandwidth back.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth)
// Alice wil send the Settle to Bob.
select {
case msg = <-aliceMsgs:
case <-time.After(2 * time.Second):
t.Fatalf("did not receive message")
}
settleHtlc, ok := msg.(*lnwire.UpdateFufillHTLC)
if !ok {
t.Fatalf("expected UpdateFufillHTLC, got %T", msg)
}
pre := settleHtlc.PaymentPreimage
idx := settleHtlc.ID
err = bobChannel.ReceiveHTLCSettle(pre, idx)
if err != nil {
t.Fatalf("unable to receive settle: %v", err)
}
// After a settle the link should do a state transition automatically,
// so we don't have to trigger it.
if err := handleStateUpdate(aliceLink, bobChannel); err != nil {
t.Fatalf("unable to update state: %v", err)
}
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth)
// Finally, we'll test the scenario of failing an HTLC received from the
// remote node. This should result in no perceived bandwidth changes.
htlcAmt, totalTimelock, hops = generateHops(htlcAmt, testStartingHeight,
aliceLink)
blob, err = generateRoute(hops...)
if err != nil {
t.Fatalf("unable to gen route: %v", err)
}
invoice, htlc, err = generatePayment(htlcAmt, htlcAmt, totalTimelock, blob)
if err != nil {
t.Fatalf("unable to create payment: %v", err)
}
if err := aliceLink.cfg.Registry.(*mockInvoiceRegistry).AddInvoice(*invoice); err != nil {
t.Fatalf("unable to add invoice to registry: %v", err)
}
// Since we are not using the link to handle HTLC IDs for the
// remote channel, we must set this manually. This is the second
// HTLC we add, hence it should have an ID of 1 (Alice's channel
// link will set this automatically for her side).
htlc.ID = 1
bobIndex, err = bobChannel.AddHTLC(htlc)
if err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
aliceLink.HandleChannelUpdate(htlc)
time.Sleep(time.Millisecond * 500)
// No changes before the HTLC is locked in.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth)
if err := updateState(tmr, aliceLink, bobChannel, false); err != nil {
t.Fatalf("unable to update state: %v", err)
}
// After lock-in, Alice will have to pay the htlc fee.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth-htlcFee)
// Now fail this HTLC.
failPkt := htlcPacket{
incomingHTLCID: bobIndex,
htlc: &lnwire.UpdateFailHTLC{
ID: bobIndex,
},
}
aliceLink.HandleSwitchPacket(&failPkt)
time.Sleep(time.Millisecond * 500)
// Alice should get all her bandwidth back.
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth)
// Message should be sent to Bob.
select {
case msg = <-aliceMsgs:
case <-time.After(2 * time.Second):
t.Fatalf("did not receive message")
}
failMsg, ok = msg.(*lnwire.UpdateFailHTLC)
if !ok {
t.Fatalf("expected UpdateFailHTLC, got %T", msg)
}
err = bobChannel.ReceiveFailHTLC(failMsg.ID, []byte("fail"))
if err != nil {
t.Fatalf("failed receiving fail htlc: %v", err)
}
// After failing an HTLC, the link will automatically trigger
// a state update.
if err := handleStateUpdate(aliceLink, bobChannel); err != nil {
t.Fatalf("unable to update state: %v", err)
}
assertLinkBandwidth(t, aliceLink, aliceStartingBandwidth)
}
// TestChannelLinkBandwidthConsistencyOverflow tests that in the case of a
// commitment overflow (no more space for new HTLC's), the bandwidth is updated
// properly as items are being added and removed from the overflow queue.
func TestChannelLinkBandwidthConsistencyOverflow(t *testing.T) {
t.Parallel()
var mockBlob [lnwire.OnionPacketSize]byte
const chanAmt = btcutil.SatoshiPerBitcoin * 5
aliceLink, bobChannel, batchTick, cleanUp, err := newSingleLinkTestHarness(chanAmt)
if err != nil {
t.Fatalf("unable to create link: %v", err)
}
defer cleanUp()
var (
coreLink = aliceLink.(*channelLink)
defaultCommitFee = coreLink.channel.StateSnapshot().CommitFee
aliceStartingBandwidth = aliceLink.Bandwidth()
aliceMsgs = coreLink.cfg.Peer.(*mockPeer).sentMsgs
)
estimator := &lnwallet.StaticFeeEstimator{
FeeRate: 24,
}
feePerWeight, err := estimator.EstimateFeePerWeight(1)
if err != nil {
t.Fatalf("unable to query fee estimator: %v", err)
}
feePerKw := feePerWeight * 1000
// The starting bandwidth of the channel should be exactly the amount
// that we created the channel between her and Bob.
expectedBandwidth := lnwire.NewMSatFromSatoshis(chanAmt - defaultCommitFee)
assertLinkBandwidth(t, aliceLink, expectedBandwidth)
addLinkHTLC := func(amt lnwire.MilliSatoshi) [32]byte {
invoice, htlc, err := generatePayment(amt, amt, 5, mockBlob)
if err != nil {
t.Fatalf("unable to create payment: %v", err)
}
aliceLink.HandleSwitchPacket(&htlcPacket{
htlc: htlc,
amount: amt,
})
return invoice.Terms.PaymentPreimage
}
// We'll first start by adding enough HTLC's to overflow the commitment
// transaction, checking the reported link bandwidth for proper
// consistency along the way
htlcAmt := lnwire.NewMSatFromSatoshis(100000)
totalHtlcAmt := lnwire.MilliSatoshi(0)
const numHTLCs = lnwallet.MaxHTLCNumber / 2
var preImages [][32]byte
for i := 0; i < numHTLCs; i++ {
preImage := addLinkHTLC(htlcAmt)
preImages = append(preImages, preImage)
totalHtlcAmt += htlcAmt
}
// The HTLCs should all be sent to the remote.
var msg lnwire.Message
for i := 0; i < numHTLCs; i++ {
select {
case msg = <-aliceMsgs:
case <-time.After(2 * time.Second):
t.Fatalf("did not receive message")
}
addHtlc, ok := msg.(*lnwire.UpdateAddHTLC)
if !ok {
t.Fatalf("expected UpdateAddHTLC, got %T", msg)
}
_, err := bobChannel.ReceiveHTLC(addHtlc)
if err != nil {
t.Fatalf("bob failed receiving htlc: %v", err)
}
}
select {
case msg = <-aliceMsgs:
t.Fatalf("unexpected message: %T", msg)
case <-time.After(20 * time.Millisecond):
}
// TODO(roasbeef): increase sleep
time.Sleep(time.Second * 1)
commitWeight := lnwallet.CommitWeight + lnwallet.HtlcWeight*numHTLCs
htlcFee := lnwire.NewMSatFromSatoshis(
btcutil.Amount((int64(feePerKw) * commitWeight) / 1000),
)
expectedBandwidth = aliceStartingBandwidth - totalHtlcAmt - htlcFee
expectedBandwidth += lnwire.NewMSatFromSatoshis(defaultCommitFee)
assertLinkBandwidth(t, aliceLink, expectedBandwidth)
// The overflow queue should be empty at this point, as the commitment
// transaction should be full, but not yet overflown.
if coreLink.overflowQueue.Length() != 0 {
t.Fatalf("wrong overflow queue length: expected %v, got %v", 0,
coreLink.overflowQueue.Length())
}
// At this point, the commitment transaction should now be fully
// saturated. We'll continue adding HTLC's, and asserting that the
// bandwidth accounting is done properly.
const numOverFlowHTLCs = 20
for i := 0; i < numOverFlowHTLCs; i++ {
preImage := addLinkHTLC(htlcAmt)
preImages = append(preImages, preImage)
totalHtlcAmt += htlcAmt
}
// No messages should be sent to the remote at this point.
select {
case msg = <-aliceMsgs:
t.Fatalf("unexpected message: %T", msg)
case <-time.After(20 * time.Millisecond):
}
time.Sleep(time.Second * 2)
expectedBandwidth -= (numOverFlowHTLCs * htlcAmt)
assertLinkBandwidth(t, aliceLink, expectedBandwidth)
// With the extra HTLC's added, the overflow queue should now be
// populated with our 20 additional HTLC's.
if coreLink.overflowQueue.Length() != numOverFlowHTLCs {
t.Fatalf("wrong overflow queue length: expected %v, got %v",
numOverFlowHTLCs,
coreLink.overflowQueue.Length())
}
// We trigger a state update to lock in the HTLCs. This should
// not change Alice's bandwidth.
if err := updateState(batchTick, coreLink, bobChannel, true); err != nil {
t.Fatalf("unable to update state: %v", err)
}
time.Sleep(time.Millisecond * 500)
assertLinkBandwidth(t, aliceLink, expectedBandwidth)
// At this point, we'll now settle enough HTLCs to empty the overflow
// queue. The resulting bandwidth change should be non-existent as this
// will simply transfer over funds to the remote party. However, the
// size of the overflow queue should be decreasing
for i := 0; i < numOverFlowHTLCs; i++ {
err = bobChannel.SettleHTLC(preImages[i], uint64(i))
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
htlcSettle := &lnwire.UpdateFulfillHTLC{
ID: uint64(i),
PaymentPreimage: preImages[i],
}
aliceLink.HandleChannelUpdate(htlcSettle)
time.Sleep(time.Millisecond * 50)
}
time.Sleep(time.Millisecond * 500)
assertLinkBandwidth(t, aliceLink, expectedBandwidth)
// We trigger a state update to lock in the Settles.
if err := updateState(batchTick, coreLink, bobChannel, false); err != nil {
t.Fatalf("unable to update state: %v", err)
}
// After the state update is done, Alice should start sending
// HTLCs from the overflow queue.
for i := 0; i < numOverFlowHTLCs; i++ {
var msg lnwire.Message
select {
case msg = <-aliceMsgs:
case <-time.After(2 * time.Second):
t.Fatalf("did not receive message")
}
addHtlc, ok := msg.(*lnwire.UpdateAddHTLC)
if !ok {
t.Fatalf("expected UpdateAddHTLC, got %T", msg)
}
_, err := bobChannel.ReceiveHTLC(addHtlc)
if err != nil {
t.Fatalf("bob failed receiving htlc: %v", err)
}
}
select {
case msg = <-aliceMsgs:
t.Fatalf("unexpected message: %T", msg)
case <-time.After(20 * time.Millisecond):
}
assertLinkBandwidth(t, aliceLink, expectedBandwidth)
// Finally, at this point, the queue itself should be fully empty. As
// enough slots have been drained from the commitment transaction to
// allocate the queue items to.
time.Sleep(time.Millisecond * 500)
if coreLink.overflowQueue.Length() != 0 {
t.Fatalf("wrong overflow queue length: expected %v, got %v", 0,
coreLink.overflowQueue.Length())
}
}
// TestChannelRetransmission tests the ability of the channel links to
// synchronize theirs states after abrupt disconnect.
func TestChannelRetransmission(t *testing.T) {
t.Parallel()
retransmissionTests := []struct {
name string
messages []expectedMessage
}{
{
// Tests the ability of the channel links states to be
// synchronized after remote node haven't receive
// revoke and ack message.
name: "intercept last alice revoke_and_ack",
messages: []expectedMessage{
// First initialization of the channel.
{"alice", "bob", &lnwire.ChannelReestablish{}, false},
{"bob", "alice", &lnwire.ChannelReestablish{}, false},
{"alice", "bob", &lnwire.FundingLocked{}, false},
{"bob", "alice", &lnwire.FundingLocked{}, false},
// Send payment from Alice to Bob and intercept
// the last revocation message, in this case
// Bob should not proceed the payment farther.
{"alice", "bob", &lnwire.UpdateAddHTLC{}, false},
{"alice", "bob", &lnwire.CommitSig{}, false},
{"bob", "alice", &lnwire.RevokeAndAck{}, false},
{"bob", "alice", &lnwire.CommitSig{}, false},
{"alice", "bob", &lnwire.RevokeAndAck{}, true},
// Reestablish messages exchange on nodes restart.
{"alice", "bob", &lnwire.ChannelReestablish{}, false},
{"bob", "alice", &lnwire.ChannelReestablish{}, false},
// Alice should resend the revoke_and_ack
// message to Bob because Bob claimed it in the
// re-establish message.
{"alice", "bob", &lnwire.RevokeAndAck{}, false},
// Proceed the payment farther by sending the
// fulfilment message and trigger the state
// update.
{"bob", "alice", &lnwire.UpdateFulfillHTLC{}, false},
{"bob", "alice", &lnwire.CommitSig{}, false},
{"alice", "bob", &lnwire.RevokeAndAck{}, false},
{"alice", "bob", &lnwire.CommitSig{}, false},
{"bob", "alice", &lnwire.RevokeAndAck{}, false},
},
},
{
// Tests the ability of the channel links states to be
// synchronized after remote node haven't receive
// revoke and ack message.
name: "intercept bob revoke_and_ack commit_sig messages",
messages: []expectedMessage{
{"alice", "bob", &lnwire.ChannelReestablish{}, false},
{"bob", "alice", &lnwire.ChannelReestablish{}, false},
{"alice", "bob", &lnwire.FundingLocked{}, false},
{"bob", "alice", &lnwire.FundingLocked{}, false},
// Send payment from Alice to Bob and intercept
// the last revocation message, in this case
// Bob should not proceed the payment farther.
{"alice", "bob", &lnwire.UpdateAddHTLC{}, false},
{"alice", "bob", &lnwire.CommitSig{}, false},
// Intercept bob commit sig and revoke and ack
// messages.
{"bob", "alice", &lnwire.RevokeAndAck{}, true},
{"bob", "alice", &lnwire.CommitSig{}, true},
// Reestablish messages exchange on nodes restart.
{"alice", "bob", &lnwire.ChannelReestablish{}, false},
{"bob", "alice", &lnwire.ChannelReestablish{}, false},
// Bob should resend previously intercepted messages.
{"bob", "alice", &lnwire.RevokeAndAck{}, false},
{"bob", "alice", &lnwire.CommitSig{}, false},
// Proceed the payment farther by sending the
// fulfilment message and trigger the state
// update.
{"alice", "bob", &lnwire.RevokeAndAck{}, false},
{"bob", "alice", &lnwire.UpdateFulfillHTLC{}, false},
{"bob", "alice", &lnwire.CommitSig{}, false},
{"alice", "bob", &lnwire.RevokeAndAck{}, false},
{"alice", "bob", &lnwire.CommitSig{}, false},
{"bob", "alice", &lnwire.RevokeAndAck{}, false},
},
},
{
// Tests the ability of the channel links states to be
// synchronized after remote node haven't receive
// update and commit sig messages.
name: "intercept update add htlc and commit sig messages",
messages: []expectedMessage{
{"alice", "bob", &lnwire.ChannelReestablish{}, false},
{"bob", "alice", &lnwire.ChannelReestablish{}, false},
{"alice", "bob", &lnwire.FundingLocked{}, false},
{"bob", "alice", &lnwire.FundingLocked{}, false},
// Attempt make a payment from Alice to Bob,
// which is intercepted, emulating the Bob
// server abrupt stop.
{"alice", "bob", &lnwire.UpdateAddHTLC{}, true},
{"alice", "bob", &lnwire.CommitSig{}, true},
// Restart of the nodes, and after that nodes
// should exchange the reestablish messages.
{"alice", "bob", &lnwire.ChannelReestablish{}, false},
{"bob", "alice", &lnwire.ChannelReestablish{}, false},
{"alice", "bob", &lnwire.FundingLocked{}, false},
{"bob", "alice", &lnwire.FundingLocked{}, false},
// After Bob has notified Alice that he didn't
// receive updates Alice should re-send them.
{"alice", "bob", &lnwire.UpdateAddHTLC{}, false},
{"alice", "bob", &lnwire.CommitSig{}, false},
{"bob", "alice", &lnwire.RevokeAndAck{}, false},
{"bob", "alice", &lnwire.CommitSig{}, false},
{"alice", "bob", &lnwire.RevokeAndAck{}, false},
{"bob", "alice", &lnwire.UpdateFulfillHTLC{}, false},
{"bob", "alice", &lnwire.CommitSig{}, false},
{"alice", "bob", &lnwire.RevokeAndAck{}, false},
{"alice", "bob", &lnwire.CommitSig{}, false},
{"bob", "alice", &lnwire.RevokeAndAck{}, false},
},
},
}
paymentWithRestart := func(t *testing.T, messages []expectedMessage) {
channels, cleanUp, restoreChannelsFromDb, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*5,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
chanID := lnwire.NewChanIDFromOutPoint(channels.aliceToBob.ChannelPoint())
serverErr := make(chan error, 4)
aliceInterceptor := createInterceptorFunc("[alice] <-- [bob]",
"alice", messages, chanID, false)
bobInterceptor := createInterceptorFunc("[alice] --> [bob]",
"bob", messages, chanID, false)
ct := newConcurrentTester(t)
// Add interceptor to check the order of Bob and Alice
// messages.
n := newThreeHopNetwork(ct,
channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob,
testStartingHeight,
)
n.aliceServer.intersect(aliceInterceptor)
n.bobServer.intersect(bobInterceptor)
if err := n.start(); err != nil {
ct.Fatalf("unable to start three hop network: %v", err)
}
defer n.stop()
bobBandwidthBefore := n.firstBobChannelLink.Bandwidth()
aliceBandwidthBefore := n.aliceChannelLink.Bandwidth()
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
htlcAmt, totalTimelock, hops := generateHops(amount, testStartingHeight,
n.firstBobChannelLink)
// Send payment which should fail because we intercept the
// update and commit messages.
//
// TODO(roasbeef); increase timeout?
receiver := n.bobServer
rhash, err := n.makePayment(n.aliceServer, receiver,
n.bobServer.PubKey(), hops, amount, htlcAmt,
totalTimelock).Wait(time.Second * 5)
if err == nil {
ct.Fatalf("payment shouldn't haven been finished")
}
// Stop network cluster and create new one, with the old
// channels states. Also do the *hack* - save the payment
// receiver to pass it in new channel link, otherwise payment
// will be failed because of the unknown payment hash. Hack
// will be removed with sphinx payment.
bobRegistry := n.bobServer.registry
n.stop()
channels, err = restoreChannelsFromDb()
if err != nil {
ct.Fatalf("unable to restore channels from database: %v", err)
}
n = newThreeHopNetwork(ct, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
n.firstBobChannelLink.cfg.Registry = bobRegistry
n.aliceServer.intersect(aliceInterceptor)
n.bobServer.intersect(bobInterceptor)
if err := n.start(); err != nil {
ct.Fatalf("unable to start three hop network: %v", err)
}
defer n.stop()
// Wait for reestablishment to be proceeded and invoice to be settled.
// TODO(andrew.shvv) Will be removed if we move the notification center
// to the channel link itself.
var invoice channeldb.Invoice
for i := 0; i < 20; i++ {
select {
case <-time.After(time.Millisecond * 200):
case serverErr := <-serverErr:
ct.Fatalf("server error: %v", serverErr)
}
// Check that alice invoice wasn't settled and
// bandwidth of htlc links hasn't been changed.
invoice, err = receiver.registry.LookupInvoice(rhash)
if err != nil {
err = errors.Errorf("unable to get invoice: %v", err)
continue
}
if !invoice.Terms.Settled {
err = errors.Errorf("alice invoice haven't been settled")
continue
}
aliceExpectedBandwidth := aliceBandwidthBefore - htlcAmt
if aliceExpectedBandwidth != n.aliceChannelLink.Bandwidth() {
err = errors.Errorf("expected alice to have %v, instead has %v",
aliceExpectedBandwidth, n.aliceChannelLink.Bandwidth())
continue
}
bobExpectedBandwidth := bobBandwidthBefore + htlcAmt
if bobExpectedBandwidth != n.firstBobChannelLink.Bandwidth() {
err = errors.Errorf("expected bob to have %v, instead has %v",
bobExpectedBandwidth, n.firstBobChannelLink.Bandwidth())
continue
}
break
}
if err != nil {
ct.Fatal(err)
}
}
for _, test := range retransmissionTests {
passed := t.Run(test.name, func(t *testing.T) {
paymentWithRestart(t, test.messages)
})
if !passed {
break
}
}
}
// TestShouldAdjustCommitFee tests the shouldAdjustCommitFee pivot function to
// ensure that ie behaves properly. We should only update the fee if it
// deviates from our current fee by more 10% or more.
func TestShouldAdjustCommitFee(t *testing.T) {
tests := []struct {
netFee btcutil.Amount
chanFee btcutil.Amount
shouldAdjust bool
}{
// The network fee is 3x lower than the current commitment
// transaction. As a result, we should adjust our fee to match
// it.
{
netFee: 100,
chanFee: 3000,
shouldAdjust: true,
},
// The network fee is lower than the current commitment fee,
// but only slightly so, so we won't update the commitment fee.
{
netFee: 2999,
chanFee: 3000,
shouldAdjust: false,
},
// The network fee is lower than the commitment fee, but only
// right before it crosses our current threshold.
{
netFee: 1000,
chanFee: 1099,
shouldAdjust: false,
},
// The network fee is lower than the commitment fee, and within
// our range of adjustment, so we should adjust.
{
netFee: 1000,
chanFee: 1100,
shouldAdjust: true,
},
// The network fee is 2x higher than our commitment fee, so we
// should adjust upwards.
{
netFee: 2000,
chanFee: 1000,
shouldAdjust: true,
},
// The network fee is higher than our commitment fee, but only
// slightly so, so we won't update.
{
netFee: 1001,
chanFee: 1000,
shouldAdjust: false,
},
// The network fee is higher than our commitment fee, but
// hasn't yet crossed our activation threshold.
{
netFee: 1100,
chanFee: 1099,
shouldAdjust: false,
},
// The network fee is higher than our commitment fee, and
// within our activation threshold, so we should update our
// fee.
{
netFee: 1100,
chanFee: 1000,
shouldAdjust: true,
},
// Our fees match exactly, so we shouldn't update it at all.
{
netFee: 1000,
chanFee: 1000,
shouldAdjust: false,
},
}
for i, test := range tests {
adjustedFee := shouldAdjustCommitFee(
test.netFee, test.chanFee,
)
if adjustedFee && !test.shouldAdjust {
t.Fatalf("test #%v failed: net_fee=%v, "+
"chan_fee=%v, adjust_expect=%v, adjust_returned=%v",
i, test.netFee, test.chanFee, test.shouldAdjust,
adjustedFee)
}
}
}
// TestChannelLinkUpdateCommitFee tests that when a new block comes in, the
// channel link properly checks to see if it should update the commitment fee.
func TestChannelLinkUpdateCommitFee(t *testing.T) {
t.Parallel()
// First, we'll create our traditional three hop network. We'll only be
// interacting with and asserting the state of two of the end points
// for this test.
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
// First, we'll set up some message interceptors to ensure that the
// proper messages are sent when updating fees.
chanID := n.aliceChannelLink.ChanID()
messages := []expectedMessage{
{"alice", "bob", &lnwire.ChannelReestablish{}, false},
{"bob", "alice", &lnwire.ChannelReestablish{}, false},
{"alice", "bob", &lnwire.FundingLocked{}, false},
{"bob", "alice", &lnwire.FundingLocked{}, false},
{"alice", "bob", &lnwire.UpdateFee{}, false},
{"alice", "bob", &lnwire.CommitSig{}, false},
{"bob", "alice", &lnwire.RevokeAndAck{}, false},
{"bob", "alice", &lnwire.CommitSig{}, false},
{"alice", "bob", &lnwire.RevokeAndAck{}, false},
}
n.aliceServer.intersect(createInterceptorFunc("[alice] <-- [bob]",
"alice", messages, chanID, false))
n.bobServer.intersect(createInterceptorFunc("[alice] --> [bob]",
"bob", messages, chanID, false))
if err := n.start(); err != nil {
t.Fatal(err)
}
defer n.stop()
defer n.feeEstimator.Stop()
// First, we'll start off all channels at "height" 9000 by sending a
// new epoch to all the clients.
select {
case n.aliceBlockEpoch <- &chainntnfs.BlockEpoch{
Height: 9000,
}:
case <-time.After(time.Second * 5):
t.Fatalf("link didn't read block epoch")
}
select {
case n.bobFirstBlockEpoch <- &chainntnfs.BlockEpoch{
Height: 9000,
}:
case <-time.After(time.Second * 5):
t.Fatalf("link didn't read block epoch")
}
startingFeeRate := channels.aliceToBob.CommitFeeRate()
// Next, we'll send the first fee rate response to Alice.
select {
case n.feeEstimator.weightFeeIn <- startingFeeRate / 1000:
case <-time.After(time.Second * 5):
t.Fatalf("alice didn't query for the new " +
"network fee")
}
time.Sleep(time.Millisecond * 500)
// The fee rate on the alice <-> bob channel should still be the same
// on both sides.
aliceFeeRate := channels.aliceToBob.CommitFeeRate()
bobFeeRate := channels.bobToAlice.CommitFeeRate()
if aliceFeeRate != bobFeeRate {
t.Fatalf("fee rates don't match: expected %v got %v",
aliceFeeRate, bobFeeRate)
}
if aliceFeeRate != startingFeeRate {
t.Fatalf("alice's fee rate shouldn't have changed: "+
"expected %v, got %v", aliceFeeRate, startingFeeRate)
}
if bobFeeRate != startingFeeRate {
t.Fatalf("bob's fee rate shouldn't have changed: "+
"expected %v, got %v", bobFeeRate, startingFeeRate)
}
// Now we'll send a new block update to all end points, with a new
// height THAT'S OVER 9000!!!
select {
case n.aliceBlockEpoch <- &chainntnfs.BlockEpoch{
Height: 9001,
}:
case <-time.After(time.Second * 5):
t.Fatalf("link didn't read block epoch")
}
select {
case n.bobFirstBlockEpoch <- &chainntnfs.BlockEpoch{
Height: 9001,
}:
case <-time.After(time.Second * 5):
t.Fatalf("link didn't read block epoch")
}
// Next, we'll set up a deliver a fee rate that's triple the current
// fee rate. This should cause the Alice (the initiator) to trigger a
// fee update.
newFeeRate := startingFeeRate * 3
select {
case n.feeEstimator.weightFeeIn <- newFeeRate:
case <-time.After(time.Second * 5):
t.Fatalf("alice didn't query for the new " +
"network fee")
}
time.Sleep(time.Second * 2)
// At this point, Alice should've triggered a new fee update that
// increased the fee rate to match the new rate.
//
// We'll scale the new fee rate by 100 as we deal with units of fee
// per-kw.
expectedFeeRate := newFeeRate * 1000
aliceFeeRate = channels.aliceToBob.CommitFeeRate()
bobFeeRate = channels.bobToAlice.CommitFeeRate()
if aliceFeeRate != expectedFeeRate {
t.Fatalf("alice's fee rate didn't change: expected %v, got %v",
expectedFeeRate, aliceFeeRate)
}
if bobFeeRate != expectedFeeRate {
t.Fatalf("bob's fee rate didn't change: expected %v, got %v",
expectedFeeRate, aliceFeeRate)
}
if aliceFeeRate != bobFeeRate {
t.Fatalf("fee rates don't match: expected %v got %v",
aliceFeeRate, bobFeeRate)
}
}
// TestChannelLinkRejectDuplicatePayment tests that if a link receives an
// incoming HTLC for a payment we have already settled, then it rejects the
// HTLC. We do this as we want to enforce the fact that invoices are only to be
// used _once.
func TestChannelLinkRejectDuplicatePayment(t *testing.T) {
t.Parallel()
// First, we'll create our traditional three hop network. We'll only be
// interacting with and asserting the state of two of the end points
// for this test.
channels, cleanUp, _, err := createClusterChannels(
btcutil.SatoshiPerBitcoin*3,
btcutil.SatoshiPerBitcoin*5)
if err != nil {
t.Fatalf("unable to create channel: %v", err)
}
defer cleanUp()
n := newThreeHopNetwork(t, channels.aliceToBob, channels.bobToAlice,
channels.bobToCarol, channels.carolToBob, testStartingHeight)
if err := n.start(); err != nil {
t.Fatalf("unable to start three hop network: %v", err)
}
defer n.stop()
amount := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
// We'll start off by making a payment from Alice to Carol. We'll
// manually generate this request so we can control all the parameters.
htlcAmt, totalTimelock, hops := generateHops(amount, testStartingHeight,
n.firstBobChannelLink, n.carolChannelLink)
blob, err := generateRoute(hops...)
if err != nil {
t.Fatal(err)
}
invoice, htlc, err := generatePayment(amount, htlcAmt, totalTimelock,
blob)
if err != nil {
t.Fatal(err)
}
if err := n.carolServer.registry.AddInvoice(*invoice); err != nil {
t.Fatalf("unable to add invoice in carol registry: %v", err)
}
// With the invoice now added to Carol's registry, we'll send the
// payment. It should succeed w/o any issues as it has been crafted
// properly.
_, err = n.aliceServer.htlcSwitch.SendHTLC(n.bobServer.PubKey(), htlc,
newMockDeobfuscator())
if err != nil {
t.Fatalf("unable to send payment to carol: %v", err)
}
// Now, if we attempt to send the payment *again* it should be rejected
// as it's a duplicate request.
_, err = n.aliceServer.htlcSwitch.SendHTLC(n.bobServer.PubKey(), htlc,
newMockDeobfuscator())
if err.Error() != lnwire.CodeUnknownPaymentHash.String() {
t.Fatal("error haven't been received")
}
}
// TODO(roasbeef): add test for re-sending after hodl mode, to settle any lingering
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