Allow selecting coins in sendcoins

cmd/lncli/cmd_open_channel.go

@@ -406,7 +406,7 @@ func openChannel(ctx *cli.Context) error {
 	if ctx.IsSet("utxo") {
 		utxos := ctx.StringSlice("utxo")
 
-		outpoints, err := utxosToOutpoints(utxos)
+		outpoints, err := UtxosToOutpoints(utxos)
 		if err != nil {
 			return fmt.Errorf("unable to decode utxos: %w", err)
 		}
@@ -1141,21 +1141,3 @@ func decodePsbt(psbt string) ([]byte, error) {
 		return nil, fmt.Errorf("not a PSBT")
 	}
 }
-
-// parseUtxos parses a comma separated list of utxos into outpoints that are
-// passed to the server.
-func utxosToOutpoints(utxos []string) ([]*lnrpc.OutPoint, error) {
-	var outpoints []*lnrpc.OutPoint
-	if len(utxos) == 0 {
-		return nil, fmt.Errorf("no utxos specified")
-	}
-	for _, utxo := range utxos {
-		outpoint, err := NewProtoOutPoint(utxo)
-		if err != nil {
-			return nil, err
-		}
-		outpoints = append(outpoints, outpoint)
-	}
-
-	return outpoints, nil
-}

cmd/lncli/commands.go

@@ -288,10 +288,11 @@ var sendCoinsCommand = cli.Command{
 		},
 		cli.BoolFlag{
 			Name: "sweepall",
-			Usage: "if set, then the amount field will be ignored, " +
-				"and the wallet will attempt to sweep all " +
-				"outputs within the wallet to the target " +
-				"address",
+			Usage: "if set, then the amount field should be " +
+				"unset. This indicates that the wallet will " +
+				"attempt to sweep all outputs within the " +
+				"wallet or all funds in select utxos (when " +
+				"supplied) to the target address",
 		},
 		cli.Int64Flag{
 			Name:  "amt",
@@ -330,16 +331,28 @@ var sendCoinsCommand = cli.Command{
 				"scripts",
 		},
 		coinSelectionStrategyFlag,
+		cli.StringSliceFlag{
+			Name: "utxo",
+			Usage: "a utxo specified as outpoint(tx:idx) which " +
+				"will be used as input for the transaction. " +
+				"This flag can be repeatedly used to specify " +
+				"multiple utxos as inputs. The selected " +
+				"utxos can either be entirely spent by " +
+				"specifying the sweepall flag or a specified " +
+				"amount can be spent in the utxos through " +
+				"the amt flag",
+		},
 		txLabelFlag,
 	},
 	Action: actionDecorator(sendCoins),
 }
 
 func sendCoins(ctx *cli.Context) error {
 	var (
-		addr string
-		amt  int64
-		err  error
+		addr      string
+		amt       int64
+		err       error
+		outpoints []*lnrpc.OutPoint
 	)
 	ctxc := getContext()
 	args := ctx.Args()
@@ -417,6 +430,15 @@ func sendCoins(ctx *cli.Context) error {
 		displayAmt = balanceResponse.GetConfirmedBalance()
 	}
 
+	if ctx.IsSet("utxo") {
+		utxos := ctx.StringSlice("utxo")
+
+		outpoints, err = UtxosToOutpoints(utxos)
+		if err != nil {
+			return fmt.Errorf("unable to decode utxos: %w", err)
+		}
+	}
+
 	// Ask for confirmation if we're on an actual terminal and the output is
 	// not being redirected to another command. This prevents existing shell
 	// scripts from breaking.
@@ -440,6 +462,7 @@ func sendCoins(ctx *cli.Context) error {
 		MinConfs:              minConfs,
 		SpendUnconfirmed:      minConfs == 0,
 		CoinSelectionStrategy: coinSelectionStrategy,
+		Outpoints:             outpoints,
 	}
 	txid, err := client.SendCoins(ctxc, req)
 	if err != nil {

cmd/lncli/types.go

@@ -85,3 +85,22 @@ func NewFailedUpdateFromProto(update *lnrpc.FailedUpdate) *FailedUpdate {
 		UpdateError: update.UpdateError,
 	}
 }
+
+// UtxosToOutpoints converts a slice of UTXO strings into a slice of OutPoint
+// protobuf objects. It returns an error if no UTXOs are specified or if any
+// UTXO string cannot be parsed into an OutPoint.
+func UtxosToOutpoints(utxos []string) ([]*lnrpc.OutPoint, error) {
+	var outpoints []*lnrpc.OutPoint
+	if len(utxos) == 0 {
+		return nil, fmt.Errorf("no utxos specified")
+	}
+	for _, utxo := range utxos {
+		outpoint, err := NewProtoOutPoint(utxo)
+		if err != nil {
+			return nil, err
+		}
+		outpoints = append(outpoints, outpoint)
+	}
+
+	return outpoints, nil
+}

docs/release-notes/release-notes-0.18.3.md

@@ -58,6 +58,36 @@ commitment when the channel was force closed.
   send payment stream context, or automatically at the end of the timeout period 
   if the user provided `timeout_seconds`.
 
+* The [SendCoinsRequest](https://github.com/lightningnetwork/lnd/pull/8955) now
+  takes an optional param `Outpoints`, which is a list of `*lnrpc.OutPoint`
+  that specifies the coins from the wallet to be spent in this RPC call. To
+  send selected coins to a given address with a given amount,
+  ```go
+      req := &lnrpc.SendCoinsRequest{
+          Addr: ...,
+          Amount: ...,
+          Outpoints: []*lnrpc.OutPoint{
+              selected_wallet_utxo_1,
+              selected_wallet_utxo_2,
+          },
+      }
+
+      SendCoins(req)
+  ```
+  To send selected coins to a given address without change output,
+  ```go
+      req := &lnrpc.SendCoinsRequest{
+        Addr: ...,
+        SendAll: true,
+        Outpoints: []*lnrpc.OutPoint{
+            selected_wallet_utxo_1,
+            selected_wallet_utxo_2,
+        },
+      }
+
+      SendCoins(req)
+  ```
+
 ## lncli Additions
 
 * [Added](https://github.com/lightningnetwork/lnd/pull/8491) the `cltv_expiry`
@@ -68,6 +98,18 @@ commitment when the channel was force closed.
   command returns the fee rate estimate for on-chain transactions in sat/kw and
   sat/vb to achieve a given confirmation target.
 
+* [`sendcoins` now takes an optional utxo
+  flag](https://github.com/lightningnetwork/lnd/pull/8955). This allows users
+  to specify the coins that they want to use as inputs for the transaction. To
+  send selected coins to a given address with a given amount,
+  ```sh
+  sendcoins --addr YOUR_ADDR --amt YOUR_AMT --utxo selected_wallet_utxo1 --utxo selected_wallet_utxo2
+  ```
+  To send selected coins to a given address without change output,
+  ```sh
+  sendcoins --addr YOUR_ADDR --utxo selected_wallet_utxo1 --utxo selected_wallet_utxo2 --sweepall
+  ```
+
 # Improvements
 ## Functional Updates
 

itest/list_on_test.go

@@ -46,8 +46,16 @@ var allTestCases = []*lntest.TestCase{
 		TestFunc: testDataLossProtection,
 	},
 	{
-		Name:     "sweep coins",
-		TestFunc: testSweepAllCoins,
+		Name:     "send all coins",
+		TestFunc: testSendAllCoins,
+	},
+	{
+		Name:     "send selected coins",
+		TestFunc: testSendSelectedCoins,
+	},
+	{
+		Name:     "send selected coins channel reserve",
+		TestFunc: testSendSelectedCoinsChannelReserve,
 	},
 	{
 		Name:     "disconnecting target peer",