Support spend_unconfirmed in EstimateFee and FundPsbt

lnrpc/rpc.proto

@@ -899,6 +899,13 @@ message EstimateFeeRequest {
     // The target number of blocks that this transaction should be confirmed
     // by.
     int32 target_conf = 2;
+
+    // The minimum number of confirmations each one of your outputs used for
+    // the transaction must satisfy.
+    int32 min_confs = 3;
+
+    // Whether unconfirmed outputs should be used as inputs for the transaction.
+    bool spend_unconfirmed = 4;
 }
 
 message EstimateFeeResponse {

lnrpc/rpc.swagger.json

@@ -2034,6 +2034,22 @@
             "required": false,
             "type": "integer",
             "format": "int32"
+          },
+          {
+            "name": "min_confs",
+            "description": "The minimum number of confirmations each one of your outputs used for\nthe transaction must satisfy.",
+            "in": "query",
+            "required": false,
+            "type": "integer",
+            "format": "int32"
+          },
+          {
+            "name": "spend_unconfirmed",
+            "description": "Whether unconfirmed outputs should be used as inputs for the transaction.",
+            "in": "query",
+            "required": false,
+            "type": "boolean",
+            "format": "boolean"
           }
         ],
         "tags": [

lnrpc/walletrpc/psbt.go

@@ -14,7 +14,6 @@ import (
 )
 
 const (
-	defaultMinConf = 1
 	defaultMaxConf = math.MaxInt32
 )
 

lnrpc/walletrpc/walletkit.proto

@@ -724,6 +724,13 @@ message FundPsbtRequest {
     account is used.
     */
     string account = 5;
+
+    // The minimum number of confirmations each one of your outputs used for
+    // the transaction must satisfy.
+    int32 min_confs = 6;
+
+    // Whether unconfirmed outputs should be used as inputs for the transaction.
+    bool spend_unconfirmed = 7;
 }
 message FundPsbtResponse {
     /*

lnrpc/walletrpc/walletkit.swagger.json

@@ -1010,6 +1010,16 @@
         "account": {
           "type": "string",
           "description": "The name of the account to fund the PSBT with. If empty, the default wallet\naccount is used."
+        },
+        "min_confs": {
+          "type": "integer",
+          "format": "int32",
+          "description": "The minimum number of confirmations each one of your outputs used for\nthe transaction must satisfy."
+        },
+        "spend_unconfirmed": {
+          "type": "boolean",
+          "format": "boolean",
+          "description": "Whether unconfirmed outputs should be used as inputs for the transaction."
         }
       }
     },

lnrpc/walletrpc/walletkit_server.go

@@ -1069,6 +1069,15 @@ func (w *WalletKit) FundPsbt(_ context.Context,
 			"specify either target_conf or set_per_vbyte")
 	}
 
+	// Then, we'll extract the minimum number of confirmations that each
+	// output we use to fund the transaction should satisfy.
+	minConfs, err := lnrpc.ExtractMinConfs(
+		req.GetMinConfs(), req.GetSpendUnconfirmed(),
+	)
+	if err != nil {
+		return nil, err
+	}
+
 	// The RPC parsing part is now over. Several of the following operations
 	// require us to hold the global coin selection lock so we do the rest
 	// of the tasks while holding the lock. The result is a list of locked
@@ -1087,7 +1096,7 @@ func (w *WalletKit) FundPsbt(_ context.Context,
 		if len(packet.UnsignedTx.TxIn) > 0 {
 			// Get a list of all unspent witness outputs.
 			utxos, err := w.cfg.Wallet.ListUnspentWitness(
-				defaultMinConf, defaultMaxConf, account,
+				minConfs, defaultMaxConf, account,
 			)
 			if err != nil {
 				return err

lntest/mock/walletcontroller.go

@@ -107,15 +107,15 @@ func (w *WalletController) SendOutputs(outputs []*wire.TxOut,
 
 // CreateSimpleTx currently returns dummy values.
 func (w *WalletController) CreateSimpleTx(outputs []*wire.TxOut,
-	_ chainfee.SatPerKWeight, _ bool) (*txauthor.AuthoredTx, error) {
+	_ chainfee.SatPerKWeight, _ int32, _ bool) (*txauthor.AuthoredTx, error) {
 
 	return nil, nil
 }
 
 // ListUnspentWitness is called by the wallet when doing coin selection. We just
 // need one unspent for the funding transaction.
-func (w *WalletController) ListUnspentWitness(minconfirms,
-	maxconfirms int32, _ string) ([]*lnwallet.Utxo, error) {
+func (w *WalletController) ListUnspentWitness(minConfs,
+	maxConfs int32, _ string) ([]*lnwallet.Utxo, error) {
 
 	// If the mock already has a list of utxos, return it.
 	if w.Utxos != nil {

lnwallet/btcwallet/btcwallet.go

@@ -484,7 +484,7 @@ func (b *BtcWallet) ImportPublicKey(pubKey *btcec.PublicKey,
 //
 // This is a part of the WalletController interface.
 func (b *BtcWallet) SendOutputs(outputs []*wire.TxOut,
-	feeRate chainfee.SatPerKWeight, minconf int32, label string) (*wire.MsgTx, error) {
+	feeRate chainfee.SatPerKWeight, minConfs int32, label string) (*wire.MsgTx, error) {
 
 	// Convert our fee rate from sat/kw to sat/kb since it's required by
 	// SendOutputs.
@@ -495,13 +495,13 @@ func (b *BtcWallet) SendOutputs(outputs []*wire.TxOut,
 		return nil, lnwallet.ErrNoOutputs
 	}
 
-	// Sanity check minconf.
-	if minconf < 0 {
+	// Sanity check minConfs.
+	if minConfs < 0 {
 		return nil, lnwallet.ErrInvalidMinconf
 	}
 
 	return b.wallet.SendOutputs(
-		outputs, nil, defaultAccount, minconf, feeSatPerKB, label,
+		outputs, nil, defaultAccount, minConfs, feeSatPerKB, label,
 	)
 }
 
@@ -519,7 +519,8 @@ func (b *BtcWallet) SendOutputs(outputs []*wire.TxOut,
 //
 // This is a part of the WalletController interface.
 func (b *BtcWallet) CreateSimpleTx(outputs []*wire.TxOut,
-	feeRate chainfee.SatPerKWeight, dryRun bool) (*txauthor.AuthoredTx, error) {
+	feeRate chainfee.SatPerKWeight, minConfs int32,
+	dryRun bool) (*txauthor.AuthoredTx, error) {
 
 	// The fee rate is passed in using units of sat/kw, so we'll convert
 	// this to sat/KB as the CreateSimpleTx method requires this unit.
@@ -529,6 +530,12 @@ func (b *BtcWallet) CreateSimpleTx(outputs []*wire.TxOut,
 	if len(outputs) < 1 {
 		return nil, lnwallet.ErrNoOutputs
 	}
+
+	// Sanity check minConfs.
+	if minConfs < 0 {
+		return nil, lnwallet.ErrInvalidMinconf
+	}
+
 	for _, output := range outputs {
 		// When checking an output for things like dusty-ness, we'll
 		// use the default mempool relay fee rather than the target
@@ -544,7 +551,7 @@ func (b *BtcWallet) CreateSimpleTx(outputs []*wire.TxOut,
 	}
 
 	return b.wallet.CreateSimpleTx(
-		nil, defaultAccount, outputs, 1, feeSatPerKB, dryRun,
+		nil, defaultAccount, outputs, minConfs, feeSatPerKB, dryRun,
 	)
 }
 
@@ -608,11 +615,11 @@ func (b *BtcWallet) ReleaseOutput(id wtxmgr.LockID, op wire.OutPoint) error {
 }
 
 // ListUnspentWitness returns all unspent outputs which are version 0 witness
-// programs. The 'minconfirms' and 'maxconfirms' parameters indicate the minimum
+// programs. The 'minConfs' and 'maxConfs' parameters indicate the minimum
 // and maximum number of confirmations an output needs in order to be returned
-// by this method. Passing -1 as 'minconfirms' indicates that even unconfirmed
-// outputs should be returned. Using MaxInt32 as 'maxconfirms' implies returning
-// all outputs with at least 'minconfirms'. The account parameter serves as a
+// by this method. Passing -1 as 'minConfs' indicates that even unconfirmed
+// outputs should be returned. Using MaxInt32 as 'maxConfs' implies returning
+// all outputs with at least 'minConfs'. The account parameter serves as a
 // filter to retrieve the unspent outputs for a specific account.  When empty,
 // the unspent outputs of all wallet accounts are returned.
 //

lnwallet/interface.go

@@ -66,7 +66,7 @@ var (
 var ErrNoOutputs = errors.New("no outputs")
 
 // ErrInvalidMinconf is returned if we try to create a transaction with
-// invalid minconf value.
+// invalid minConfs value.
 var ErrInvalidMinconf = errors.New("minimum number of confirmations must " +
 	"be a non-negative number")
 
@@ -236,7 +236,7 @@ type WalletController interface {
 	//
 	// NOTE: This method requires the global coin selection lock to be held.
 	SendOutputs(outputs []*wire.TxOut,
-		feeRate chainfee.SatPerKWeight, minconf int32, label string) (*wire.MsgTx, error)
+		feeRate chainfee.SatPerKWeight, minConfs int32, label string) (*wire.MsgTx, error)
 
 	// CreateSimpleTx creates a Bitcoin transaction paying to the specified
 	// outputs. The transaction is not broadcasted to the network. In the
@@ -251,20 +251,20 @@ type WalletController interface {
 	//
 	// NOTE: This method requires the global coin selection lock to be held.
 	CreateSimpleTx(outputs []*wire.TxOut, feeRate chainfee.SatPerKWeight,
-		dryRun bool) (*txauthor.AuthoredTx, error)
+		minConfs int32, dryRun bool) (*txauthor.AuthoredTx, error)
 
 	// ListUnspentWitness returns all unspent outputs which are version 0
-	// witness programs. The 'minconfirms' and 'maxconfirms' parameters
+	// witness programs. The 'minConfs' and 'maxConfs' parameters
 	// indicate the minimum and maximum number of confirmations an output
 	// needs in order to be returned by this method. Passing -1 as
-	// 'minconfirms' indicates that even unconfirmed outputs should be
-	// returned. Using MaxInt32 as 'maxconfirms' implies returning all
-	// outputs with at least 'minconfirms'. The account parameter serves as
+	// 'minConfs' indicates that even unconfirmed outputs should be
+	// returned. Using MaxInt32 as 'maxConfs' implies returning all
+	// outputs with at least 'minConfs'. The account parameter serves as
 	// a filter to retrieve the unspent outputs for a specific account.
 	// When empty, the unspent outputs of all wallet accounts are returned.
 	//
 	// NOTE: This method requires the global coin selection lock to be held.
-	ListUnspentWitness(minconfirms, maxconfirms int32,
+	ListUnspentWitness(minConfs, maxConfs int32,
 		accountFilter string) ([]*Utxo, error)
 
 	// ListTransactionDetails returns a list of all transactions which are

lnwallet/test/test_interface.go

@@ -2547,6 +2547,8 @@ func testLastUnusedAddr(miner *rpctest.Harness,
 // testCreateSimpleTx checks that a call to CreateSimpleTx will return a
 // transaction that is equal to the one that is being created by SendOutputs in
 // a subsequent call.
+// All test cases are doubled-up: one for testing unconfirmed inputs,
+// one for testing only confirmed inputs.
 func testCreateSimpleTx(r *rpctest.Harness, w *lnwallet.LightningWallet,
 	_ *lnwallet.LightningWallet, t *testing.T) {
 
@@ -2558,51 +2560,108 @@ func testCreateSimpleTx(r *rpctest.Harness, w *lnwallet.LightningWallet,
 
 	// The test cases we will run through for all backends.
 	testCases := []struct {
-		outVals []int64
-		feeRate chainfee.SatPerKWeight
-		valid   bool
+		outVals     []int64
+		feeRate     chainfee.SatPerKWeight
+		valid       bool
+		unconfirmed bool
 	}{
 		{
-			outVals: []int64{},
-			feeRate: 2500,
-			valid:   false, // No outputs.
+			outVals:     []int64{},
+			feeRate:     2500,
+			valid:       false, // No outputs.
+			unconfirmed: false,
+		},
+		{
+			outVals:     []int64{},
+			feeRate:     2500,
+			valid:       false, // No outputs.
+			unconfirmed: true,
 		},
 
 		{
-			outVals: []int64{200},
-			feeRate: 2500,
-			valid:   false, // Dust output.
+			outVals:     []int64{200},
+			feeRate:     2500,
+			valid:       false, // Dust output.
+			unconfirmed: false,
+		},
+		{
+			outVals:     []int64{200},
+			feeRate:     2500,
+			valid:       false, // Dust output.
+			unconfirmed: true,
 		},
 
 		{
-			outVals: []int64{1e8},
-			feeRate: 2500,
-			valid:   true,
+			outVals:     []int64{1e8},
+			feeRate:     2500,
+			valid:       true,
+			unconfirmed: false,
 		},
 		{
-			outVals: []int64{1e8, 2e8, 1e8, 2e7, 3e5},
-			feeRate: 2500,
-			valid:   true,
+			outVals:     []int64{1e8},
+			feeRate:     2500,
+			valid:       true,
+			unconfirmed: true,
 		},
+
 		{
-			outVals: []int64{1e8, 2e8, 1e8, 2e7, 3e5},
-			feeRate: 12500,
-			valid:   true,
+			outVals:     []int64{1e8, 2e8, 1e8, 2e7, 3e5},
+			feeRate:     2500,
+			valid:       true,
+			unconfirmed: false,
 		},
 		{
-			outVals: []int64{1e8, 2e8, 1e8, 2e7, 3e5},
-			feeRate: 50000,
-			valid:   true,
+			outVals:     []int64{1e8, 2e8, 1e8, 2e7, 3e5},
+			feeRate:     2500,
+			valid:       true,
+			unconfirmed: true,
 		},
+
+		{
+			outVals:     []int64{1e8, 2e8, 1e8, 2e7, 3e5},
+			feeRate:     12500,
+			valid:       true,
+			unconfirmed: false,
+		},
+		{
+			outVals:     []int64{1e8, 2e8, 1e8, 2e7, 3e5},
+			feeRate:     12500,
+			valid:       true,
+			unconfirmed: true,
+		},
+
+		{
+			outVals:     []int64{1e8, 2e8, 1e8, 2e7, 3e5},
+			feeRate:     50000,
+			valid:       true,
+			unconfirmed: false,
+		},
+		{
+			outVals:     []int64{1e8, 2e8, 1e8, 2e7, 3e5},
+			feeRate:     50000,
+			valid:       true,
+			unconfirmed: true,
+		},
+
 		{
 			outVals: []int64{1e8, 2e8, 1e8, 2e7, 3e5, 1e8, 2e8,
 				1e8, 2e7, 3e5},
-			feeRate: 44250,
-			valid:   true,
+			feeRate:     44250,
+			valid:       true,
+			unconfirmed: false,
+		},
+		{
+			outVals: []int64{1e8, 2e8, 1e8, 2e7, 3e5, 1e8, 2e8,
+				1e8, 2e7, 3e5},
+			feeRate:     44250,
+			valid:       true,
+			unconfirmed: true,
 		},
 	}
 
 	for i, test := range testCases {
+		var minConfs int32 = 1
+
 		feeRate := test.feeRate
 
 		// Grab some fresh addresses from the miner that we will send
@@ -2629,7 +2688,7 @@ func testCreateSimpleTx(r *rpctest.Harness, w *lnwallet.LightningWallet,
 
 		// Now try creating a tx spending to these outputs.
 		createTx, createErr := w.CreateSimpleTx(
-			outputs, feeRate, true,
+			outputs, feeRate, minConfs, true,
 		)
 		switch {
 		case test.valid && createErr != nil:
@@ -2646,7 +2705,7 @@ func testCreateSimpleTx(r *rpctest.Harness, w *lnwallet.LightningWallet,
 		// _very_ similar to the one we just created being sent. The
 		// only difference is that the dry run tx is not signed, and
 		// that the change output position might be different.
-		tx, sendErr := w.SendOutputs(outputs, feeRate, 1, labels.External)
+		tx, sendErr := w.SendOutputs(outputs, feeRate, minConfs, labels.External)
 		switch {
 		case test.valid && sendErr != nil:
 			t.Fatalf("got unexpected error when sending tx: %v",