lnrpc: ability to spend unconfirmed coins

lnrpc/rpc.proto

@@ -863,6 +863,13 @@ message SendManyRequest {
 
     // An optional label for the transaction, limited to 500 characters.
     string label = 6;
+
+    // The minimum number of confirmations each one of your outputs used for
+    // the transaction must satisfy.
+    int32 min_confs = 7;
+
+    // Whether unconfirmed outputs should be used as inputs for the transaction.
+    bool spend_unconfirmed = 8;
 }
 message SendManyResponse {
     // The id of the transaction
@@ -893,6 +900,13 @@ message SendCoinsRequest {
 
     // An optional label for the transaction, limited to 500 characters.
     string label = 7;
+
+    // The minimum number of confirmations each one of your outputs used for
+    // the transaction must satisfy.
+    int32 min_confs = 8;
+
+    // Whether unconfirmed outputs should be used as inputs for the transaction.
+    bool spend_unconfirmed = 9;
 }
 message SendCoinsResponse {
     // The transaction ID of the transaction

lnrpc/rpc.swagger.json

@@ -5243,6 +5243,16 @@
         "label": {
           "type": "string",
           "description": "An optional label for the transaction, limited to 500 characters."
+        },
+        "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."
         }
       }
     },
@@ -5279,6 +5289,16 @@
         "label": {
           "type": "string",
           "description": "An optional label for the transaction, limited to 500 characters."
+        },
+        "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/rpc_utils.go

@@ -2,6 +2,7 @@ package lnrpc
 
 import (
 	"encoding/hex"
+	"errors"
 	"sort"
 
 	"github.com/lightningnetwork/lnd/lnwallet"
@@ -52,3 +53,38 @@ func RPCTransactionDetails(txns []*lnwallet.TransactionDetail) *TransactionDetai
 
 	return txDetails
 }
+
+// ExtractMinConfs extracts the minimum number of confirmations that each
+// output used to fund a transaction should satisfy.
+func ExtractMinConfs(minConfs int32, spendUnconfirmed bool) (int32, error) {
+	switch {
+	// Ensure that the MinConfs parameter is non-negative.
+	case minConfs < 0:
+		return 0, errors.New("minimum number of confirmations must " +
+			"be a non-negative number")
+
+	// The transaction should not be funded with unconfirmed outputs
+	// unless explicitly specified by SpendUnconfirmed. We do this to
+	// provide sane defaults to the OpenChannel RPC, as otherwise, if the
+	// MinConfs field isn't explicitly set by the caller, we'll use
+	// unconfirmed outputs without the caller being aware.
+	case minConfs == 0 && !spendUnconfirmed:
+		return 1, nil
+
+	// In the event that the caller set MinConfs > 0 and SpendUnconfirmed to
+	// true, we'll return an error to indicate the conflict.
+	case minConfs > 0 && spendUnconfirmed:
+		return 0, errors.New("SpendUnconfirmed set to true with " +
+			"MinConfs > 0")
+
+	// The funding transaction of the new channel to be created can be
+	// funded with unconfirmed outputs.
+	case spendUnconfirmed:
+		return 0, nil
+
+	// If none of the above cases matched, we'll return the value set
+	// explicitly by the caller.
+	default:
+		return minConfs, nil
+	}
+}

lnrpc/walletrpc/walletkit.pb.go

@@ -626,7 +626,12 @@ type SendOutputsRequest struct {
 	//A slice of the outputs that should be created in the transaction produced.
 	Outputs []*signrpc.TxOut `protobuf:"bytes,2,rep,name=outputs,proto3" json:"outputs,omitempty"`
 	// An optional label for the transaction, limited to 500 characters.
-	Label                string   `protobuf:"bytes,3,opt,name=label,proto3" json:"label,omitempty"`
+	Label string `protobuf:"bytes,3,opt,name=label,proto3" json:"label,omitempty"`
+	// The minimum number of confirmations each one of your outputs used for
+	// the transaction must satisfy.
+	MinConfs int32 `protobuf:"varint,4,opt,name=min_confs,json=minConfs,proto3" json:"min_confs,omitempty"`
+	// Whether unconfirmed outputs should be used as inputs for the transaction.
+	SpendUnconfirmed     bool     `protobuf:"varint,5,opt,name=spend_unconfirmed,json=spendUnconfirmed,proto3" json:"spend_unconfirmed,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -678,6 +683,20 @@ func (m *SendOutputsRequest) GetLabel() string {
 	return ""
 }
 
+func (m *SendOutputsRequest) GetMinConfs() int32 {
+	if m != nil {
+		return m.MinConfs
+	}
+	return 0
+}
+
+func (m *SendOutputsRequest) GetSpendUnconfirmed() bool {
+	if m != nil {
+		return m.SpendUnconfirmed
+	}
+	return false
+}
+
 type SendOutputsResponse struct {
 	//
 	//The serialized transaction sent out on the network.
@@ -1381,97 +1400,99 @@ func init() {
 func init() { proto.RegisterFile("walletrpc/walletkit.proto", fileDescriptor_6cc6942ac78249e5) }
 
 var fileDescriptor_6cc6942ac78249e5 = []byte{
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+	0x32, 0x0e, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.

lnrpc/walletrpc/walletkit.proto

@@ -233,6 +233,13 @@ message SendOutputsRequest {
 
     // An optional label for the transaction, limited to 500 characters.
     string label = 3;
+
+    // The minimum number of confirmations each one of your outputs used for
+    // the transaction must satisfy.
+    int32 min_confs = 4;
+
+    // Whether unconfirmed outputs should be used as inputs for the transaction.
+    bool spend_unconfirmed = 5;
 }
 message SendOutputsResponse {
     /*

lnrpc/walletrpc/walletkit.swagger.json

@@ -877,6 +877,16 @@
         "label": {
           "type": "string",
           "description": "An optional label for the transaction, limited to 500 characters."
+        },
+        "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

@@ -473,6 +473,13 @@ func (w *WalletKit) SendOutputs(ctx context.Context,
 		})
 	}
 
+	// 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.MinConfs, req.SpendUnconfirmed)
+	if err != nil {
+		return nil, err
+	}
+
 	label, err := labels.ValidateAPI(req.Label)
 	if err != nil {
 		return nil, err
@@ -481,7 +488,7 @@ func (w *WalletKit) SendOutputs(ctx context.Context,
 	// Now that we have the outputs mapped, we can request that the wallet
 	// attempt to create this transaction.
 	tx, err := w.cfg.Wallet.SendOutputs(
-		outputsToCreate, chainfee.SatPerKWeight(req.SatPerKw), label,
+		outputsToCreate, chainfee.SatPerKWeight(req.SatPerKw), minConfs, label,
 	)
 	if err != nil {
 		return nil, err