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loopout: attempt cooperative musig2 sweep

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This commit adds optional cooperative musig2 sweep by calling the server
to create a partial signature for the sweep if we'd otherwise be allowed
to spend the htlc. If the cooperative musig2 spend fails, we always fall
back to use the scriptpath spend.
This commit is contained in:
Andras Banki-Horvath 2022-05-05 11:59:31 +02:00
parent 32557a57ea
commit 82b58e5c0e
No known key found for this signature in database
GPG key ID: 80E5375C094198D8
5 changed files with 553 additions and 108 deletions
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31
client_test.go
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@ -309,7 +309,6 @@ func testLoopOutResume(t *testing.T, confs uint32, expired, preimageRevealed,
// Because there is no reliable payment yet, an invoice is assumed to be
// paid after resume.
testLoopOutSuccess(ctx, amt, hash,
func(r error) {},
func(r error) {},
@ -336,14 +335,31 @@ func testLoopOutSuccess(ctx *testContext, amt btcutil.Amount, hash lntypes.Hash,
// Publish tick.
ctx.expiryChan <- testTime
// Expect a signing request.
<-ctx.Lnd.SignOutputRawChannel
// Expect a signing request in the non taproot case.
if scriptVersion != swap.HtlcV3 {
<-ctx.Lnd.SignOutputRawChannel
}
if !preimageRevealed {
ctx.assertStatus(loopdb.StatePreimageRevealed)
ctx.assertStorePreimageReveal()
}
// When using taproot htlcs the flow is different as we do reveal the
// preimage before sweeping in order for the server to trust us with
// our MuSig2 signing attempts.
if scriptVersion == swap.HtlcV3 {
ctx.assertPreimagePush(testPreimage)
// Try MuSig2 signing first and fail it so that we go for a
// normal sweep.
for i := 0; i < maxMusigSweepRetries; i++ {
ctx.expiryChan <- testTime
ctx.assertPreimagePush(testPreimage)
}
<-ctx.Lnd.SignOutputRawChannel
}
// Expect client on-chain sweep of HTLC.
sweepTx := ctx.ReceiveTx()
@ -376,10 +392,11 @@ func testLoopOutSuccess(ctx *testContext, amt btcutil.Amount, hash lntypes.Hash,
preimage, err := lntypes.MakePreimage(clientPreImage)
require.NoError(ctx.T, err)
ctx.assertPreimagePush(preimage)
// Simulate server pulling payment.
signalSwapPaymentResult(nil)
if scriptVersion != swap.HtlcV3 {
ctx.assertPreimagePush(preimage)
// Simulate server pulling payment.
signalSwapPaymentResult(nil)
}
ctx.NotifySpend(sweepTx, 0)