tapchannel: import script keys of all HTLC outputs, as known

If we don't import these script keys, spends will fail later as we
didn't credit the balance, so we can't spend them.

Author: Roasbeef

tapchannel/aux_sweeper.go

@@ -1242,6 +1242,42 @@ func (a *AuxSweeper) importCommitScriptKeys(req lnwallet.ResolutionReq) error {
 	return nil
 }
 
+// importOutputScriptKey imports the output script key that this scriptDesc can
+// spend into the local addr book.
+func (a *AuxSweeper) importOutputScriptKeys(desc tapscriptSweepDescs) error {
+	ctxb := context.Background()
+
+	importScriptKey := func(desc tapscriptSweepDesc) error {
+		scriptTree := desc.scriptTree.Tree()
+
+		outputKey := asset.NewScriptKey(scriptTree.TaprootKey).PubKey
+		scriptKey := asset.ScriptKey{
+			PubKey: outputKey,
+			TweakedScriptKey: &asset.TweakedScriptKey{
+				RawKey: keychain.KeyDescriptor{
+					PubKey: scriptTree.InternalKey,
+				},
+				Tweak: scriptTree.TapscriptRoot,
+			},
+		}
+
+		log.Debugf("Importing script_keys=%v", spew.Sdump(scriptKey))
+
+		return a.cfg.AddrBook.InsertScriptKey(ctxb, scriptKey, true)
+	}
+
+	if err := importScriptKey(desc.firstLevel); err != nil {
+		return err
+	}
+
+	return lfn.MapOptionZ(
+		desc.secondLevel,
+		func(secondary tapscriptSweepDesc) error {
+			return importScriptKey(secondary)
+		},
+	)
+}
+
 // importOutputProofs imports the output proofs into the pending asset funding
 // into our local database. This preps us to be able to detect force closes.
 func importOutputProofs(scid lnwire.ShortChannelID,
@@ -1610,31 +1646,6 @@ func (a *AuxSweeper) resolveContract(
 		return lfn.Err[returnType](err)
 	}
 
-	// To be able to construct all the proofs we need to spend later, we'll
-	// make sure that this commitment transaction exists in our database.
-	// If not, then we'll complete the proof, register the script keys, and
-	// ship the pre-signed commitment transaction.
-	ctx := context.Background()
-	commitParcel, err := a.cfg.TxSender.QueryParcels(
-		ctx, fn.Some(req.CommitTx.TxHash()), false,
-	)
-	if err != nil {
-		return lfn.Err[returnType](err)
-	}
-	if len(commitParcel) == 0 {
-		log.Infof("First time seeing commit_txid=%v, importing",
-			req.CommitTx.TxHash())
-
-		err := a.importCommitTx(req, commitState, fundingInfo)
-		if err != nil {
-			return lfn.Errf[returnType]("unable to import "+
-				"commitment txn: %w", err)
-		}
-	} else {
-		log.Infof("Commitment commit_txid=%v already imported, "+
-			"skipping", req.CommitTx.TxHash())
-	}
-
 	var (
 		sweepDesc        lfn.Result[tapscriptSweepDescs]
 		assetOutputs     []*cmsg.AssetOutput
@@ -1771,20 +1782,53 @@ func (a *AuxSweeper) resolveContract(
 		// TODO(roasbeef): need to do HTLC revocation casesj:w
 	}
 
+	tapSweepDesc, err := sweepDesc.Unpack()
+	if err != nil {
+		return lfn.Err[tlv.Blob](err)
+	}
+
+	// Now that we know what output we're sweeping, before we proceed, we'll
+	// import the relevant script key to disk. This way, we'll properly
+	// recognize spends of it.
+	if err := a.importOutputScriptKeys(tapSweepDesc); err != nil {
+		return lfn.Errf[tlv.Blob]("unable to import output script "+
+			"key: %w", err)
+	}
+
+	// To be able to construct all the proofs we need to spend later, we'll
+	// make sure that this commitment transaction exists in our database. If
+	// not, then we'll complete the proof, register the script keys, and
+	// ship the pre-signed commitment transaction.
+	ctx := context.Background()
+	commitParcel, err := a.cfg.TxSender.QueryParcels(
+		ctx, fn.Some(req.CommitTx.TxHash()), false,
+	)
+	if err != nil {
+		return lfn.Err[returnType](err)
+	}
+	if len(commitParcel) == 0 {
+		log.Infof("First time seeing commit_txid=%v, importing",
+			req.CommitTx.TxHash())
+
+		err := a.importCommitTx(req, commitState, fundingInfo)
+		if err != nil {
+			return lfn.Errf[returnType]("unable to import "+
+				"commitment txn: %w", err)
+		}
+	} else {
+		log.Infof("Commitment commit_txid=%v already imported, "+
+			"skipping", req.CommitTx.TxHash())
+	}
+
 	// The input proofs above were made originally using the fake commit tx
 	// as an anchor. We now know the real commit tx, so we'll swap that in
 	// to ensure the outpoints used below are correct.
 	for _, assetOut := range assetOutputs {
 		assetOut.Proof.Val.AnchorTx = *req.CommitTx
 	}
 
-	log.Infof("Sweeping %v asset outputs: %v", len(assetOutputs),
-		limitSpewer.Sdump(assetOutputs))
-
-	tapSweepDesc, err := sweepDesc.Unpack()
-	if err != nil {
-		return lfn.Err[tlv.Blob](err)
-	}
+	log.Infof("Sweeping %v asset outputs (second_level=%v): %v",
+		len(assetOutputs), needsSecondLevel, spew.Sdump(assetOutputs))
 
 	// With the sweep desc constructed above, we'll create vPackets for each
 	// of the local assets, then sign them all.