lnwallet: add previous_outpoints to ListTransactionDetails

lnwallet/btcwallet/btcwallet.go

@@ -18,6 +18,7 @@ import (
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcwallet/chain"
 	"github.com/btcsuite/btcwallet/waddrmgr"
+	"github.com/btcsuite/btcwallet/wallet"
 	base "github.com/btcsuite/btcwallet/wallet"
 	"github.com/btcsuite/btcwallet/wallet/txauthor"
 	"github.com/btcsuite/btcwallet/wallet/txrules"
@@ -1104,6 +1105,32 @@ func extractBalanceDelta(
 	return balanceDelta, nil
 }
 
+// getPreviousOutpoints is a helper function which gets the previous
+// outpoints of a transaction.
+func getPreviousOutpoints(wireTx *wire.MsgTx,
+	myInputs []wallet.TransactionSummaryInput) []lnwallet.PreviousOutPoint {
+
+	// isOurOutput is a map containing the output indices
+	// controlled by the wallet.
+	// Note: We make use of the information in `myInputs` provided
+	// by the `wallet.TransactionSummary` structure that holds
+	// information only if the input/previous_output is controlled by the wallet.
+	isOurOutput := make(map[uint32]bool, len(myInputs))
+	for _, myInput := range myInputs {
+		isOurOutput[myInput.Index] = true
+	}
+
+	previousOutpoints := make([]lnwallet.PreviousOutPoint, len(wireTx.TxIn))
+	for idx, txIn := range wireTx.TxIn {
+		previousOutpoints[idx] = lnwallet.PreviousOutPoint{
+			OutPoint:    txIn.PreviousOutPoint.String(),
+			IsOurOutput: isOurOutput[uint32(idx)],
+		}
+	}
+
+	return previousOutpoints
+}
+
 // minedTransactionsToDetails is a helper function which converts a summary
 // information about mined transactions to a TransactionDetail.
 func minedTransactionsToDetails(
@@ -1152,6 +1179,8 @@ func minedTransactionsToDetails(
 			})
 		}
 
+		previousOutpoints := getPreviousOutpoints(wireTx, tx.MyInputs)
+
 		txDetail := &lnwallet.TransactionDetail{
 			Hash:              *tx.Hash,
 			NumConfirmations:  currentHeight - block.Height + 1,
@@ -1162,6 +1191,7 @@ func minedTransactionsToDetails(
 			OutputDetails:     outputDetails,
 			RawTx:             tx.Transaction,
 			Label:             tx.Label,
+			PreviousOutpoints: previousOutpoints,
 		}
 
 		balanceDelta, err := extractBalanceDelta(tx, wireTx)
@@ -1221,6 +1251,8 @@ func unminedTransactionsToDetail(
 		})
 	}
 
+	previousOutpoints := getPreviousOutpoints(wireTx, summary.MyInputs)
+
 	txDetail := &lnwallet.TransactionDetail{
 		Hash:              *summary.Hash,
 		TotalFees:         int64(summary.Fee),
@@ -1228,6 +1260,7 @@ func unminedTransactionsToDetail(
 		OutputDetails:     outputDetails,
 		RawTx:             summary.Transaction,
 		Label:             summary.Label,
+		PreviousOutpoints: previousOutpoints,
 	}
 
 	balanceDelta, err := extractBalanceDelta(summary, wireTx)

lnwallet/btcwallet/btcwallet_test.go

@@ -0,0 +1,134 @@
+package btcwallet
+
+import (
+	"testing"
+
+	"github.com/btcsuite/btcd/wire"
+	"github.com/btcsuite/btcwallet/wallet"
+	"github.com/lightningnetwork/lnd/lnwallet"
+	"github.com/stretchr/testify/require"
+)
+
+type previousOutpointsTest struct {
+	name     string
+	tx       *wire.MsgTx
+	myInputs []wallet.TransactionSummaryInput
+	expRes   []lnwallet.PreviousOutPoint
+}
+
+var previousOutpointsTests = []previousOutpointsTest{{
+	name: "both outpoints are wallet controlled",
+	tx: &wire.MsgTx{
+		TxIn: []*wire.TxIn{{
+			PreviousOutPoint: wire.OutPoint{Index: 0},
+		}, {
+			PreviousOutPoint: wire.OutPoint{Index: 1},
+		}},
+	},
+	myInputs: []wallet.TransactionSummaryInput{{
+		Index: 0,
+	}, {
+		Index: 1,
+	}},
+	expRes: []lnwallet.PreviousOutPoint{{
+		OutPoint:    wire.OutPoint{Index: 0}.String(),
+		IsOurOutput: true,
+	}, {
+		OutPoint:    wire.OutPoint{Index: 1}.String(),
+		IsOurOutput: true,
+	}},
+}, {
+	name: "only one outpoint is wallet controlled",
+	tx: &wire.MsgTx{
+		TxIn: []*wire.TxIn{{
+			PreviousOutPoint: wire.OutPoint{Index: 0},
+		}, {
+			PreviousOutPoint: wire.OutPoint{Index: 1},
+		}},
+	},
+	myInputs: []wallet.TransactionSummaryInput{{
+		Index: 0,
+	}, {
+		Index: 2,
+	}},
+	expRes: []lnwallet.PreviousOutPoint{{
+		OutPoint:    wire.OutPoint{Index: 0}.String(),
+		IsOurOutput: true,
+	}, {
+		OutPoint:    wire.OutPoint{Index: 1}.String(),
+		IsOurOutput: false,
+	}},
+}, {
+	name: "no outpoint is wallet controlled",
+	tx: &wire.MsgTx{
+		TxIn: []*wire.TxIn{{
+			PreviousOutPoint: wire.OutPoint{Index: 0},
+		}, {
+			PreviousOutPoint: wire.OutPoint{Index: 1},
+		}},
+	},
+	myInputs: []wallet.TransactionSummaryInput{{
+		Index: 2,
+	}, {
+		Index: 3,
+	}},
+	expRes: []lnwallet.PreviousOutPoint{{
+		OutPoint:    wire.OutPoint{Index: 0}.String(),
+		IsOurOutput: false,
+	}, {
+		OutPoint:    wire.OutPoint{Index: 1}.String(),
+		IsOurOutput: false,
+	}},
+}, {
+	name: "tx is empty",
+	tx: &wire.MsgTx{
+		TxIn: []*wire.TxIn{},
+	},
+	myInputs: []wallet.TransactionSummaryInput{{
+		Index: 2,
+	}, {
+		Index: 3,
+	}},
+	expRes: []lnwallet.PreviousOutPoint{},
+}, {
+	name: "wallet controlled input set is empty",
+	tx: &wire.MsgTx{
+		TxIn: []*wire.TxIn{{
+			PreviousOutPoint: wire.OutPoint{Index: 0},
+		}, {
+			PreviousOutPoint: wire.OutPoint{Index: 1},
+		}},
+	},
+	myInputs: []wallet.TransactionSummaryInput{},
+	expRes: []lnwallet.PreviousOutPoint{{
+		OutPoint:    wire.OutPoint{Index: 0}.String(),
+		IsOurOutput: false,
+	}, {
+		OutPoint:    wire.OutPoint{Index: 1}.String(),
+		IsOurOutput: false,
+	}},
+}}
+
+// TestPreviousOutpoints tests if we are able to get the previous
+// outpoints correctly.
+func TestPreviousOutpoints(t *testing.T) {
+	for _, test := range previousOutpointsTests {
+		t.Run(test.name, func(t *testing.T) {
+			respOutpoints := getPreviousOutpoints(
+				test.tx, test.myInputs,
+			)
+
+			for idx, respOutpoint := range respOutpoints {
+				expRes := test.expRes[idx]
+				require.Equal(
+					t, expRes.OutPoint,
+					respOutpoint.OutPoint,
+				)
+				require.Equal(
+					t, expRes.IsOurOutput,
+					respOutpoint.IsOurOutput,
+				)
+			}
+		})
+	}
+}

lnwallet/interface.go

@@ -98,6 +98,17 @@ type OutputDetail struct {
 	IsOurAddress bool
 }
 
+// PreviousOutPoint contains information about the previous outpoint.
+type PreviousOutPoint struct {
+	// OutPoint is the transaction out point in the format txid:n.
+	OutPoint string
+
+	// IsOurOutput denotes if the previous output is controlled by the
+	// internal wallet. The flag will only detect p2wkh, np2wkh and p2tr
+	// inputs as its own.
+	IsOurOutput bool
+}
+
 // TransactionDetail describes a transaction with either inputs which belong to
 // the wallet, or has outputs that pay to the wallet.
 type TransactionDetail struct {
@@ -141,6 +152,9 @@ type TransactionDetail struct {
 
 	// Label is an optional transaction label.
 	Label string
+
+	// PreviousOutpoints are the inputs for a transaction.
+	PreviousOutpoints []PreviousOutPoint
 }
 
 // TransactionSubscription is an interface which describes an object capable of