lnd.xprv/routing/pathfind_test.go
2017-12-17 18:40:05 -08:00

932 lines
28 KiB
Go

package routing
import (
"bytes"
"encoding/binary"
"encoding/hex"
"encoding/json"
"errors"
"io/ioutil"
"math/big"
"net"
"os"
"strings"
"testing"
"time"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/roasbeef/btcd/btcec"
"github.com/roasbeef/btcd/chaincfg/chainhash"
"github.com/roasbeef/btcd/wire"
"github.com/roasbeef/btcutil"
prand "math/rand"
)
const (
// basicGraphFilePath is the file path for a basic graph used within
// the tests. The basic graph consists of 5 nodes with 5 channels
// connecting them.
basicGraphFilePath = "testdata/basic_graph.json"
// excessiveHopsGraphFilePath is a file path which stores the JSON dump
// of a graph which was previously triggering an erroneous excessive
// hops error. The error has since been fixed, but a test case
// exercising it is kept around to guard against regressions.
excessiveHopsGraphFilePath = "testdata/excessive_hops.json"
// specExampleFilePath is a file path which stores an example which
// implementations will use in order to ensure that they're calculating
// the payload for each hop in path properly.
specExampleFilePath = "testdata/spec_example.json"
)
var (
randSource = prand.NewSource(time.Now().Unix())
randInts = prand.New(randSource)
testSig = &btcec.Signature{
R: new(big.Int),
S: new(big.Int),
}
_, _ = testSig.R.SetString("63724406601629180062774974542967536251589935445068131219452686511677818569431", 10)
_, _ = testSig.S.SetString("18801056069249825825291287104931333862866033135609736119018462340006816851118", 10)
testAuthProof = channeldb.ChannelAuthProof{
NodeSig1: testSig,
NodeSig2: testSig,
BitcoinSig1: testSig,
BitcoinSig2: testSig,
}
)
// testGraph is the struct which corresponds to the JSON format used to encode
// graphs within the files in the testdata directory.
//
// TODO(roasbeef): add test graph auto-generator
type testGraph struct {
Info []string `json:"info"`
Nodes []testNode `json:"nodes"`
Edges []testChan `json:"edges"`
}
// testNode represents a node within the test graph above. We skip certain
// information such as the node's IP address as that information isn't needed
// for our tests.
type testNode struct {
Source bool `json:"source"`
PubKey string `json:"pubkey"`
Alias string `json:"alias"`
}
// testChan represents the JSON version of a payment channel. This struct
// matches the Json that's encoded under the "edges" key within the test graph.
type testChan struct {
Node1 string `json:"node_1"`
Node2 string `json:"node_2"`
ChannelID uint64 `json:"channel_id"`
ChannelPoint string `json:"channel_point"`
Flags uint16 `json:"flags"`
Expiry uint16 `json:"expiry"`
MinHTLC int64 `json:"min_htlc"`
FeeBaseMsat int64 `json:"fee_base_msat"`
FeeRate int64 `json:"fee_rate"`
Capacity int64 `json:"capacity"`
}
// makeTestGraph creates a new instance of a channeldb.ChannelGraph for testing
// purposes. A callback which cleans up the created temporary directories is
// also returned and intended to be executed after the test completes.
func makeTestGraph() (*channeldb.ChannelGraph, func(), error) {
// First, create a temporary directory to be used for the duration of
// this test.
tempDirName, err := ioutil.TempDir("", "channeldb")
if err != nil {
return nil, nil, err
}
// Next, create channeldb for the first time.
cdb, err := channeldb.Open(tempDirName)
if err != nil {
return nil, nil, err
}
cleanUp := func() {
cdb.Close()
os.RemoveAll(tempDirName)
}
return cdb.ChannelGraph(), cleanUp, nil
}
// aliasMap is a map from a node's alias to its public key. This type is
// provided in order to allow easily look up from the human rememberable alias
// to an exact node's public key.
type aliasMap map[string]*btcec.PublicKey
// parseTestGraph returns a fully populated ChannelGraph given a path to a JSON
// file which encodes a test graph.
func parseTestGraph(path string) (*channeldb.ChannelGraph, func(), aliasMap, error) {
graphJSON, err := ioutil.ReadFile(path)
if err != nil {
return nil, nil, nil, err
}
// First unmarshal the JSON graph into an instance of the testGraph
// struct. Using the struct tags created above in the struct, the JSON
// will be properly parsed into the struct above.
var g testGraph
if err := json.Unmarshal(graphJSON, &g); err != nil {
return nil, nil, nil, err
}
// We'll use this fake address for the IP address of all the nodes in
// our tests. This value isn't needed for path finding so it doesn't
// need to be unique.
var testAddrs []net.Addr
testAddr, err := net.ResolveTCPAddr("tcp", "192.0.0.1:8888")
if err != nil {
return nil, nil, nil, err
}
testAddrs = append(testAddrs, testAddr)
// Next, create a temporary graph database for usage within the test.
graph, cleanUp, err := makeTestGraph()
if err != nil {
return nil, nil, nil, err
}
aliasMap := make(map[string]*btcec.PublicKey)
var source *channeldb.LightningNode
// First we insert all the nodes within the graph as vertexes.
for _, node := range g.Nodes {
pubBytes, err := hex.DecodeString(node.PubKey)
if err != nil {
return nil, nil, nil, err
}
pub, err := btcec.ParsePubKey(pubBytes, btcec.S256())
if err != nil {
return nil, nil, nil, err
}
dbNode := &channeldb.LightningNode{
HaveNodeAnnouncement: true,
AuthSig: testSig,
LastUpdate: time.Now(),
Addresses: testAddrs,
PubKey: pub,
Alias: node.Alias,
Features: testFeatures,
}
// We require all aliases within the graph to be unique for our
// tests.
if _, ok := aliasMap[node.Alias]; ok {
return nil, nil, nil, errors.New("aliases for nodes " +
"must be unique!")
}
// If the alias is unique, then add the node to the
// alias map for easy lookup.
aliasMap[node.Alias] = pub
// If the node is tagged as the source, then we create a
// pointer to is so we can mark the source in the graph
// properly.
if node.Source {
// If we come across a node that's marked as the
// source, and we've already set the source in a prior
// iteration, then the JSON has an error as only ONE
// node can be the source in the graph.
if source != nil {
return nil, nil, nil, errors.New("JSON is invalid " +
"multiple nodes are tagged as the source")
}
source = dbNode
}
// With the node fully parsed, add it as a vertex within the
// graph.
if err := graph.AddLightningNode(dbNode); err != nil {
return nil, nil, nil, err
}
}
if source != nil {
// Set the selected source node
if err := graph.SetSourceNode(source); err != nil {
return nil, nil, nil, err
}
}
// With all the vertexes inserted, we can now insert the edges into the
// test graph.
for _, edge := range g.Edges {
node1Bytes, err := hex.DecodeString(edge.Node1)
if err != nil {
return nil, nil, nil, err
}
node1Pub, err := btcec.ParsePubKey(node1Bytes, btcec.S256())
if err != nil {
return nil, nil, nil, err
}
node2Bytes, err := hex.DecodeString(edge.Node2)
if err != nil {
return nil, nil, nil, err
}
node2Pub, err := btcec.ParsePubKey(node2Bytes, btcec.S256())
if err != nil {
return nil, nil, nil, err
}
fundingTXID := strings.Split(edge.ChannelPoint, ":")[0]
txidBytes, err := chainhash.NewHashFromStr(fundingTXID)
if err != nil {
return nil, nil, nil, err
}
fundingPoint := wire.OutPoint{
Hash: *txidBytes,
Index: 0,
}
// We first insert the existence of the edge between the two
// nodes.
edgeInfo := channeldb.ChannelEdgeInfo{
ChannelID: edge.ChannelID,
NodeKey1: node1Pub,
NodeKey2: node2Pub,
BitcoinKey1: node1Pub,
BitcoinKey2: node2Pub,
AuthProof: &testAuthProof,
ChannelPoint: fundingPoint,
Capacity: btcutil.Amount(edge.Capacity),
}
err = graph.AddChannelEdge(&edgeInfo)
if err != nil && err != channeldb.ErrEdgeAlreadyExist {
return nil, nil, nil, err
}
edgePolicy := &channeldb.ChannelEdgePolicy{
Signature: testSig,
Flags: lnwire.ChanUpdateFlag(edge.Flags),
ChannelID: edge.ChannelID,
LastUpdate: time.Now(),
TimeLockDelta: edge.Expiry,
MinHTLC: lnwire.MilliSatoshi(edge.MinHTLC),
FeeBaseMSat: lnwire.MilliSatoshi(edge.FeeBaseMsat),
FeeProportionalMillionths: lnwire.MilliSatoshi(edge.FeeRate),
}
if err := graph.UpdateEdgePolicy(edgePolicy); err != nil {
return nil, nil, nil, err
}
}
return graph, cleanUp, aliasMap, nil
}
func TestBasicGraphPathFinding(t *testing.T) {
t.Parallel()
graph, cleanUp, aliases, err := parseTestGraph(basicGraphFilePath)
defer cleanUp()
if err != nil {
t.Fatalf("unable to create graph: %v", err)
}
sourceNode, err := graph.SourceNode()
if err != nil {
t.Fatalf("unable to fetch source node: %v", err)
}
sourceVertex := NewVertex(sourceNode.PubKey)
ignoredEdges := make(map[uint64]struct{})
ignoredVertexes := make(map[Vertex]struct{})
// With the test graph loaded, we'll test some basic path finding using
// the pre-generated graph. Consult the testdata/basic_graph.json file
// to follow along with the assumptions we'll use to test the path
// finding.
const (
startingHeight = 100
finalHopCLTV = 1
)
paymentAmt := lnwire.NewMSatFromSatoshis(100)
target := aliases["sophon"]
path, err := findPath(nil, graph, sourceNode, target, ignoredVertexes,
ignoredEdges, paymentAmt)
if err != nil {
t.Fatalf("unable to find path: %v", err)
}
route, err := newRoute(paymentAmt, sourceVertex, path, startingHeight,
finalHopCLTV)
if err != nil {
t.Fatalf("unable to create path: %v", err)
}
// The length of the route selected should be of exactly length two.
if len(route.Hops) != 2 {
t.Fatalf("route is of incorrect length, expected %v got %v", 2,
len(route.Hops))
}
// As each hop only decrements a single block from the time-lock, the
// total time lock value should two more than our starting block
// height.
if route.TotalTimeLock != 102 {
t.Fatalf("expected time lock of %v, instead have %v", 2,
route.TotalTimeLock)
}
// The first hop in the path should be an edge from roasbeef to goku.
if !route.Hops[0].Channel.Node.PubKey.IsEqual(aliases["songoku"]) {
t.Fatalf("first hop should be goku, is instead: %v",
route.Hops[0].Channel.Node.Alias)
}
// The second hop should be from goku to sophon.
if !route.Hops[1].Channel.Node.PubKey.IsEqual(aliases["sophon"]) {
t.Fatalf("second hop should be sophon, is instead: %v",
route.Hops[0].Channel.Node.Alias)
}
// Next, we'll assert that the "next hop" field in each route payload
// properly points to the channel ID that the HTLC should be forwarded
// along.
hopPayloads := route.ToHopPayloads()
if len(hopPayloads) != 2 {
t.Fatalf("incorrect number of hop payloads: expected %v, got %v",
2, len(hopPayloads))
}
// The first hop should point to the second hop.
var expectedHop [8]byte
binary.BigEndian.PutUint64(expectedHop[:], route.Hops[1].Channel.ChannelID)
if !bytes.Equal(hopPayloads[0].NextAddress[:], expectedHop[:]) {
t.Fatalf("first hop has incorrect next hop: expected %x, got %x",
expectedHop[:], hopPayloads[0].NextAddress)
}
// The second hop should have a next hop value of all zeroes in order
// to indicate it's the exit hop.
var exitHop [8]byte
if !bytes.Equal(hopPayloads[1].NextAddress[:], exitHop[:]) {
t.Fatalf("first hop has incorrect next hop: expected %x, got %x",
exitHop[:], hopPayloads[0].NextAddress)
}
// We'll also assert that the outgoing CLTV value for each hop was set
// accordingly.
if route.Hops[0].OutgoingTimeLock != 101 {
t.Fatalf("expected outgoing time-lock of %v, instead have %v",
1, route.Hops[0].OutgoingTimeLock)
}
if route.Hops[1].OutgoingTimeLock != 101 {
t.Fatalf("outgoing time-lock for final hop is incorrect: "+
"expected %v, got %v", 1, route.Hops[1].OutgoingTimeLock)
}
// Additionally, we'll ensure that the amount to forward, and fees
// computed for each hop are correct.
firstHopFee := computeFee(paymentAmt, route.Hops[1].Channel)
if route.Hops[0].Fee != firstHopFee {
t.Fatalf("first hop fee incorrect: expected %v, got %v",
firstHopFee, route.Hops[0].Fee)
}
if route.TotalAmount != paymentAmt+firstHopFee {
t.Fatalf("first hop forwarding amount incorrect: expected %v, got %v",
paymentAmt+firstHopFee, route.TotalAmount)
}
if route.Hops[1].Fee != 0 {
t.Fatalf("first hop fee incorrect: expected %v, got %v",
firstHopFee, 0)
}
if route.Hops[1].AmtToForward != paymentAmt {
t.Fatalf("second hop forwarding amount incorrect: expected %v, got %v",
paymentAmt+firstHopFee, route.Hops[1].AmtToForward)
}
// Next, attempt to query for a path to Luo Ji for 100 satoshis, there
// exist two possible paths in the graph, but the shorter (1 hop) path
// should be selected.
target = aliases["luoji"]
path, err = findPath(nil, graph, sourceNode, target, ignoredVertexes,
ignoredEdges, paymentAmt)
if err != nil {
t.Fatalf("unable to find route: %v", err)
}
route, err = newRoute(paymentAmt, sourceVertex, path, startingHeight,
finalHopCLTV)
if err != nil {
t.Fatalf("unable to create path: %v", err)
}
// The length of the path should be exactly one hop as it's the
// "shortest" known path in the graph.
if len(route.Hops) != 1 {
t.Fatalf("shortest path not selected, should be of length 1, "+
"is instead: %v", len(route.Hops))
}
// As we have a direct path, the total time lock value should be
// exactly the current block height plus one.
if route.TotalTimeLock != 101 {
t.Fatalf("expected time lock of %v, instead have %v", 1,
route.TotalTimeLock)
}
// Additionally, since this is a single-hop payment, we shouldn't have
// to pay any fees in total, so the total amount should be the payment
// amount.
if route.TotalAmount != paymentAmt {
t.Fatalf("incorrect total amount, expected %v got %v",
paymentAmt, route.TotalAmount)
}
}
func TestKShortestPathFinding(t *testing.T) {
t.Parallel()
graph, cleanUp, aliases, err := parseTestGraph(basicGraphFilePath)
defer cleanUp()
if err != nil {
t.Fatalf("unable to create graph: %v", err)
}
sourceNode, err := graph.SourceNode()
if err != nil {
t.Fatalf("unable to fetch source node: %v", err)
}
// In this test we'd like to ensure that our algoirthm to find the
// k-shortest paths from a given source node to any destination node
// works as exepcted.
// In our basic_graph.json, there exist two paths from roasbeef to luo
// ji. Our algorithm should properly find both paths, and also rank
// them in order of their total "distance".
paymentAmt := lnwire.NewMSatFromSatoshis(100)
target := aliases["luoji"]
paths, err := findPaths(nil, graph, sourceNode, target, paymentAmt)
if err != nil {
t.Fatalf("unable to find paths between roasbeef and "+
"luo ji: %v", err)
}
// The algorithm should've found two paths from roasbeef to luo ji.
if len(paths) != 2 {
t.Fatalf("two path shouldn't been found, instead %v were",
len(paths))
}
// Additinoally, the total hop length of the first path returned should
// be _less_ than that of the second path returned.
if len(paths[0]) > len(paths[1]) {
t.Fatalf("paths found not ordered properly")
}
// Finally, we'll assert the exact expected ordering of both paths
// found.
assertExpectedPath := func(path []*ChannelHop, nodeAliases ...string) {
for i, hop := range path {
if hop.Node.Alias != nodeAliases[i] {
t.Fatalf("expected %v to be pos #%v in hop, "+
"instead %v was", nodeAliases[i], i,
hop.Node.Alias)
}
}
}
// The first route should be a direct route to luo ji.
assertExpectedPath(paths[0], "roasbeef", "luoji")
// The second route should be a route to luo ji via satoshi.
assertExpectedPath(paths[1], "roasbeef", "satoshi", "luoji")
}
func TestNewRoutePathTooLong(t *testing.T) {
t.Skip()
// Ensure that potential paths which are over the maximum hop-limit are
// rejected.
graph, cleanUp, aliases, err := parseTestGraph(excessiveHopsGraphFilePath)
defer cleanUp()
if err != nil {
t.Fatalf("unable to create graph: %v", err)
}
sourceNode, err := graph.SourceNode()
if err != nil {
t.Fatalf("unable to fetch source node: %v", err)
}
ignoredEdges := make(map[uint64]struct{})
ignoredVertexes := make(map[Vertex]struct{})
paymentAmt := lnwire.NewMSatFromSatoshis(100)
// We start by confirminig that routing a payment 20 hops away is possible.
// Alice should be able to find a valid route to ursula.
target := aliases["ursula"]
_, err = findPath(nil, graph, sourceNode, target, ignoredVertexes,
ignoredEdges, paymentAmt)
if err != nil {
t.Fatalf("path should have been found")
}
// Vincent is 21 hops away from Alice, and thus no valid route should be
// presented to Alice.
target = aliases["vincent"]
path, err := findPath(nil, graph, sourceNode, target, ignoredVertexes,
ignoredEdges, paymentAmt)
if err == nil {
t.Fatalf("should not have been able to find path, supposed to be "+
"greater than 20 hops, found route with %v hops",
len(path))
}
}
func TestPathNotAvailable(t *testing.T) {
t.Parallel()
graph, cleanUp, _, err := parseTestGraph(basicGraphFilePath)
defer cleanUp()
if err != nil {
t.Fatalf("unable to create graph: %v", err)
}
sourceNode, err := graph.SourceNode()
if err != nil {
t.Fatalf("unable to fetch source node: %v", err)
}
ignoredEdges := make(map[uint64]struct{})
ignoredVertexes := make(map[Vertex]struct{})
// With the test graph loaded, we'll test that queries for target that
// are either unreachable within the graph, or unknown result in an
// error.
unknownNodeStr := "03dd46ff29a6941b4a2607525b043ec9b020b3f318a1bf281536fd7011ec59c882"
unknownNodeBytes, err := hex.DecodeString(unknownNodeStr)
if err != nil {
t.Fatalf("unable to parse bytes: %v", err)
}
unknownNode, err := btcec.ParsePubKey(unknownNodeBytes, btcec.S256())
if err != nil {
t.Fatalf("unable to parse pubkey: %v", err)
}
_, err = findPath(nil, graph, sourceNode, unknownNode, ignoredVertexes,
ignoredEdges, 100)
if !IsError(err, ErrNoPathFound) {
t.Fatalf("path shouldn't have been found: %v", err)
}
}
func TestPathInsufficientCapacity(t *testing.T) {
t.Parallel()
graph, cleanUp, aliases, err := parseTestGraph(basicGraphFilePath)
defer cleanUp()
if err != nil {
t.Fatalf("unable to create graph: %v", err)
}
sourceNode, err := graph.SourceNode()
if err != nil {
t.Fatalf("unable to fetch source node: %v", err)
}
ignoredEdges := make(map[uint64]struct{})
ignoredVertexes := make(map[Vertex]struct{})
// Next, test that attempting to find a path in which the current
// channel graph cannot support due to insufficient capacity triggers
// an error.
// To test his we'll attempt to make a payment of 1 BTC, or 100 million
// satoshis. The largest channel in the basic graph is of size 100k
// satoshis, so we shouldn't be able to find a path to sophon even
// though we have a 2-hop link.
target := aliases["sophon"]
const payAmt = btcutil.SatoshiPerBitcoin
_, err = findPath(nil, graph, sourceNode, target, ignoredVertexes,
ignoredEdges, payAmt)
if !IsError(err, ErrNoPathFound) {
t.Fatalf("graph shouldn't be able to support payment: %v", err)
}
}
// TestRouteFailMinHTLC tests that if we attempt to route an HTLC which is
// smaller than the advertised minHTLC of an edge, then path finding fails.
func TestRouteFailMinHTLC(t *testing.T) {
graph, cleanUp, aliases, err := parseTestGraph(basicGraphFilePath)
defer cleanUp()
if err != nil {
t.Fatalf("unable to create graph: %v", err)
}
sourceNode, err := graph.SourceNode()
if err != nil {
t.Fatalf("unable to fetch source node: %v", err)
}
ignoredEdges := make(map[uint64]struct{})
ignoredVertexes := make(map[Vertex]struct{})
// We'll not attempt to route an HTLC of 10 SAT from roasbeef to Son
// Goku. However, the min HTLC of Son Goku is 1k SAT, as a result, this
// attempt should fail.
target := aliases["songoku"]
payAmt := lnwire.MilliSatoshi(10)
_, err = findPath(nil, graph, sourceNode, target, ignoredVertexes,
ignoredEdges, payAmt)
if !IsError(err, ErrNoPathFound) {
t.Fatalf("graph shouldn't be able to support payment: %v", err)
}
}
// TestRouteFailDisabledEdge tests that if we attempt to route to an edge
// that's disabled, then that edge is disqualified, and the routing attempt
// will fail.
func TestRouteFailDisabledEdge(t *testing.T) {
graph, cleanUp, aliases, err := parseTestGraph(basicGraphFilePath)
defer cleanUp()
if err != nil {
t.Fatalf("unable to create graph: %v", err)
}
sourceNode, err := graph.SourceNode()
if err != nil {
t.Fatalf("unable to fetch source node: %v", err)
}
ignoredEdges := make(map[uint64]struct{})
ignoredVertexes := make(map[Vertex]struct{})
// First, we'll try to route from roasbeef -> songoku. This should
// suceed without issue, and return a single path.
target := aliases["songoku"]
payAmt := lnwire.NewMSatFromSatoshis(10000)
_, err = findPath(nil, graph, sourceNode, target, ignoredVertexes,
ignoredEdges, payAmt)
if err != nil {
t.Fatalf("unable to find path: %v", err)
}
// First, we'll modify the edge from roasbeef -> songoku, to read that
// it's disabled.
_, gokuEdge, _, err := graph.FetchChannelEdgesByID(12345)
if err != nil {
t.Fatalf("unable to fetch goku's edge: %v", err)
}
gokuEdge.Flags = lnwire.ChanUpdateDisabled
if err := graph.UpdateEdgePolicy(gokuEdge); err != nil {
t.Fatalf("unable to update edge: %v", err)
}
// Now, if we attempt to route through that edge, we should get a
// failure as it is no longer elligble.
_, err = findPath(nil, graph, sourceNode, target, ignoredVertexes,
ignoredEdges, payAmt)
if !IsError(err, ErrNoPathFound) {
t.Fatalf("graph shouldn't be able to support payment: %v", err)
}
}
func TestPathInsufficientCapacityWithFee(t *testing.T) {
t.Parallel()
// TODO(roasbeef): encode live graph to json
// TODO(roasbeef): need to add a case, or modify the fee ratio for one
// to ensure that has going forward, but when fees are applied doesn't
// work
}
func TestPathFindSpecExample(t *testing.T) {
t.Parallel()
// All our path finding tests will assume a starting height of 100, so
// we'll pass that in to ensure that the router uses 100 as the current
// height.
const startingHeight = 100
ctx, cleanUp, err := createTestCtx(startingHeight, specExampleFilePath)
defer cleanUp()
if err != nil {
t.Fatalf("unable to create router: %v", err)
}
const (
aliceFinalCLTV = 10
bobFinalCLTV = 20
carolFinalCLTV = 30
daveFinalCLTV = 40
)
// We'll first exercise the scenario of a direct payment from Bob to
// Carol, so we set "B" as the source node so path finding starts from
// Bob.
bob := ctx.aliases["B"]
bobNode, err := ctx.graph.FetchLightningNode(bob)
if err != nil {
t.Fatalf("unable to find bob: %v", err)
}
if err := ctx.graph.SetSourceNode(bobNode); err != nil {
t.Fatalf("unable to set source node: %v", err)
}
// Query for a route of 4,999,999 mSAT to carol.
carol := ctx.aliases["C"]
const amt lnwire.MilliSatoshi = 4999999
routes, err := ctx.router.FindRoutes(carol, amt)
if err != nil {
t.Fatalf("unable to find route: %v", err)
}
// We should come back with _exactly_ two routes.
if len(routes) != 2 {
t.Fatalf("expected %v routes, instead have: %v", 2,
len(routes))
}
// Now we'll examine the first route returned for correctness.
//
// It should be sending the exact payment amount as there're no
// additional hops.
firstRoute := routes[0]
if firstRoute.TotalAmount != amt {
t.Fatalf("wrong total amount: got %v, expected %v",
firstRoute.TotalAmount, amt)
}
if firstRoute.Hops[0].AmtToForward != amt {
t.Fatalf("wrong forward amount: got %v, expected %v",
firstRoute.Hops[0].AmtToForward, amt)
}
if firstRoute.Hops[0].Fee != 0 {
t.Fatalf("wrong hop fee: got %v, expected %v",
firstRoute.Hops[0].Fee, 0)
}
// The CLTV expiry should be the current height plus 9 (the expiry for
// the B -> C channel.
if firstRoute.TotalTimeLock !=
startingHeight+DefaultFinalCLTVDelta {
t.Fatalf("wrong total time lock: got %v, expecting %v",
firstRoute.TotalTimeLock,
startingHeight+DefaultFinalCLTVDelta)
}
// Next, we'll set A as the source node so we can assert that we create
// the proper route for any queries starting with Alice.
alice := ctx.aliases["A"]
aliceNode, err := ctx.graph.FetchLightningNode(alice)
if err != nil {
t.Fatalf("unable to find alice: %v", err)
}
if err := ctx.graph.SetSourceNode(aliceNode); err != nil {
t.Fatalf("unable to set source node: %v", err)
}
ctx.router.selfNode = aliceNode
source, err := ctx.graph.SourceNode()
if err != nil {
t.Fatalf("unable to retrieve source node: %v", err)
}
if !source.PubKey.IsEqual(alice) {
t.Fatalf("source node not set")
}
// We'll now request a route from A -> B -> C.
ctx.router.routeCache = make(map[routeTuple][]*Route)
routes, err = ctx.router.FindRoutes(carol, amt)
if err != nil {
t.Fatalf("unable to find routes: %v", err)
}
// We should come back with _exactly_ two routes.
if len(routes) != 2 {
t.Fatalf("expected %v routes, instead have: %v", 2,
len(routes))
}
// Both routes should be two hops.
if len(routes[0].Hops) != 2 {
t.Fatalf("route should be %v hops, is instead %v", 2,
len(routes[0].Hops))
}
if len(routes[1].Hops) != 2 {
t.Fatalf("route should be %v hops, is instead %v", 2,
len(routes[1].Hops))
}
// The total amount should factor in a fee of 10199 and also use a CLTV
// delta total of 29 (20 + 9),
expectedAmt := lnwire.MilliSatoshi(5010198)
if routes[0].TotalAmount != expectedAmt {
t.Fatalf("wrong amount: got %v, expected %v",
routes[0].TotalAmount, expectedAmt)
}
if routes[0].TotalTimeLock != startingHeight+29 {
t.Fatalf("wrong total time lock: got %v, expecting %v",
routes[0].TotalTimeLock, startingHeight+29)
}
// Ensure that the hops of the first route are properly crafted.
//
// After taking the fee, Bob should be forwarding the remainder which
// is the exact payment to Bob.
if routes[0].Hops[0].AmtToForward != amt {
t.Fatalf("wrong forward amount: got %v, expected %v",
routes[0].Hops[0].AmtToForward, amt)
}
// We shouldn't pay any fee for the first, hop, but the fee for the
// second hop posted fee should be exactly:
// The fee that we pay for the second hop will be "applied to the first
// hop, so we should get a fee of exactly:
//
// * 200 + 4999999 * 2000 / 1000000 = 10199
if routes[0].Hops[0].Fee != 10199 {
t.Fatalf("wrong hop fee: got %v, expected %v",
routes[0].Hops[0].Fee, 10199)
}
// While for the final hop, as there's no additional hop afterwards, we
// pay no fee.
if routes[0].Hops[1].Fee != 0 {
t.Fatalf("wrong hop fee: got %v, expected %v",
routes[0].Hops[0].Fee, 0)
}
// The outgoing CLTV value itself should be the current height plus 30
// to meet Carol's requirements.
if routes[0].Hops[0].OutgoingTimeLock !=
startingHeight+DefaultFinalCLTVDelta {
t.Fatalf("wrong total time lock: got %v, expecting %v",
routes[0].Hops[0].OutgoingTimeLock,
startingHeight+DefaultFinalCLTVDelta)
}
// For B -> C, we assert that the final hop also has the proper
// parameters.
lastHop := routes[0].Hops[1]
if lastHop.AmtToForward != amt {
t.Fatalf("wrong forward amount: got %v, expected %v",
lastHop.AmtToForward, amt)
}
if lastHop.OutgoingTimeLock !=
startingHeight+DefaultFinalCLTVDelta {
t.Fatalf("wrong total time lock: got %v, expecting %v",
lastHop.OutgoingTimeLock,
startingHeight+DefaultFinalCLTVDelta)
}
// We'll also make similar assertions for the second route from A to C
// via D.
secondRoute := routes[1]
expectedAmt = 5020398
if secondRoute.TotalAmount != expectedAmt {
t.Fatalf("wrong amount: got %v, expected %v",
secondRoute.TotalAmount, expectedAmt)
}
expectedTimeLock := startingHeight + daveFinalCLTV + DefaultFinalCLTVDelta
if secondRoute.TotalTimeLock != uint32(expectedTimeLock) {
t.Fatalf("wrong total time lock: got %v, expecting %v",
secondRoute.TotalTimeLock, expectedTimeLock)
}
onionPayload := secondRoute.Hops[0]
if onionPayload.AmtToForward != amt {
t.Fatalf("wrong forward amount: got %v, expected %v",
onionPayload.AmtToForward, amt)
}
expectedTimeLock = startingHeight + DefaultFinalCLTVDelta
if onionPayload.OutgoingTimeLock != uint32(expectedTimeLock) {
t.Fatalf("wrong outgoing time lock: got %v, expecting %v",
onionPayload.OutgoingTimeLock,
expectedTimeLock)
}
// The B -> C hop should also be identical as the prior cases.
lastHop = secondRoute.Hops[1]
if lastHop.AmtToForward != amt {
t.Fatalf("wrong forward amount: got %v, expected %v",
lastHop.AmtToForward, amt)
}
if lastHop.OutgoingTimeLock !=
startingHeight+DefaultFinalCLTVDelta {
t.Fatalf("wrong total time lock: got %v, expecting %v",
lastHop.OutgoingTimeLock,
startingHeight+DefaultFinalCLTVDelta)
}
}