lnd.xprv/lntest/itest/lnd_send_multi_path_payment_test.go

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package itest
import (
"context"
"encoding/hex"
"github.com/btcsuite/btcutil"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
"github.com/lightningnetwork/lnd/lntest"
)
// testSendMultiPathPayment tests that we are able to successfully route a
// payment using multiple shards across different paths.
func testSendMultiPathPayment(net *lntest.NetworkHarness, t *harnessTest) {
ctxb := context.Background()
ctx := newMppTestContext(t, net)
defer ctx.shutdownNodes()
const paymentAmt = btcutil.Amount(300000)
// Set up a network with three different paths Alice <-> Bob. Channel
// capacities are set such that the payment can only succeed if (at
// least) three paths are used.
//
// _ Eve _
// / \
// Alice -- Carol ---- Bob
// \ /
// \__ Dave ____/
//
ctx.openChannel(ctx.carol, ctx.bob, 135000)
ctx.openChannel(ctx.alice, ctx.carol, 235000)
ctx.openChannel(ctx.dave, ctx.bob, 135000)
ctx.openChannel(ctx.alice, ctx.dave, 135000)
ctx.openChannel(ctx.eve, ctx.bob, 135000)
ctx.openChannel(ctx.carol, ctx.eve, 135000)
defer ctx.closeChannels()
ctx.waitForChannels()
// Increase Dave's fee to make the test deterministic. Otherwise it
// would be unpredictable whether pathfinding would go through Charlie
// or Dave for the first shard.
_, err := ctx.dave.UpdateChannelPolicy(
context.Background(),
&lnrpc.PolicyUpdateRequest{
Scope: &lnrpc.PolicyUpdateRequest_Global{Global: true},
BaseFeeMsat: 500000,
FeeRate: 0.001,
TimeLockDelta: 40,
},
)
if err != nil {
t.Fatalf("dave policy update: %v", err)
}
// Our first test will be Alice paying Bob using a SendPayment call.
// Let Bob create an invoice for Alice to pay.
payReqs, rHashes, invoices, err := createPayReqs(
ctx.bob, paymentAmt, 1,
)
if err != nil {
t.Fatalf("unable to create pay reqs: %v", err)
}
rHash := rHashes[0]
payReq := payReqs[0]
ctxt, _ := context.WithTimeout(ctxb, defaultTimeout)
payment := sendAndAssertSuccess(
ctxt, t, ctx.alice,
&routerrpc.SendPaymentRequest{
PaymentRequest: payReq,
MaxParts: 10,
TimeoutSeconds: 60,
FeeLimitMsat: noFeeLimitMsat,
},
)
// Make sure we got the preimage.
if payment.PaymentPreimage != hex.EncodeToString(invoices[0].RPreimage) {
t.Fatalf("preimage doesn't match")
}
// Check that Alice split the payment in at least three shards. Because
// the hand-off of the htlc to the link is asynchronous (via a mailbox),
// there is some non-determinism in the process. Depending on whether
// the new pathfinding round is started before or after the htlc is
// locked into the channel, different sharding may occur. Therefore we
// can only check if the number of shards isn't below the theoretical
// minimum.
succeeded := 0
for _, htlc := range payment.Htlcs {
if htlc.Status == lnrpc.HTLCAttempt_SUCCEEDED {
succeeded++
}
}
const minExpectedShards = 3
if succeeded < minExpectedShards {
t.Fatalf("expected at least %v shards, but got %v",
minExpectedShards, succeeded)
}
// Make sure Bob show the invoice as settled for the full
// amount.
ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
inv, err := ctx.bob.LookupInvoice(
ctxt, &lnrpc.PaymentHash{
RHash: rHash,
},
)
if err != nil {
t.Fatalf("error when obtaining invoice: %v", err)
}
if inv.AmtPaidSat != int64(paymentAmt) {
t.Fatalf("incorrect payment amt for invoice"+
"want: %d, got %d",
paymentAmt, inv.AmtPaidSat)
}
if inv.State != lnrpc.Invoice_SETTLED {
t.Fatalf("Invoice not settled: %v", inv.State)
}
settled := 0
for _, htlc := range inv.Htlcs {
if htlc.State == lnrpc.InvoiceHTLCState_SETTLED {
settled++
}
}
if settled != succeeded {
t.Fatalf("expected invoice to be settled "+
"with %v HTLCs, had %v", succeeded, settled)
}
}