walletrpc+lncli: add new param. to bumpfee rpc.

Add new parameter deadline-delta to the bumpfee request and only
allow it to be used when the budget value is used as well.

cmd/commands/walletrpc_active.go

@@ -268,9 +268,10 @@ var bumpFeeCommand = cli.Command{
 		cli.Uint64Flag{
 			Name: "conf_target",
 			Usage: `
-	The deadline in number of blocks that the input should be spent within.
-	When not set, for new inputs, the default value (1008) is used; for
-	exiting inputs, their current values will be retained.`,
+	The conf target is the starting fee rate of the fee function experessed
+	in the number of blocks. So instead of using sat_per_vbyte the conf
+	target can be specified and LND will query its fee estimator for the
+	current fee rate for the given target.`,
 		},
 		cli.Uint64Flag{
 			Name:   "sat_per_byte",
@@ -307,6 +308,25 @@ var bumpFeeCommand = cli.Command{
 	the budget for fee bumping; for existing inputs, their current budgets
 	will be retained.`,
 		},
+		cli.Uint64Flag{
+			Name: "deadline-delta",
+			Usage: `
+	The deadline-delta is the width of the fee function LND will use to 
+	bump the transaction after a new block comes in. It is important to
+	note that this parameter ties closely to the budget parameter so this
+	parameter is only allowed if budget was preexisting in the RBF case
+	or a budget value is also specified. To give an example if you specify
+	a deadline-delta of 1 this means that the whole budget will be used to
+	bump the transaction (will be capped by the max fee rate setting). The
+	value of 1 is a special case. For other values a fee function will be
+	created with the starting fee rate as the initial value and the budget
+	as the last value of the fee function. So if you specify e.g. 5 for
+	the width a fee function with either a starting fee rate will be 
+	created with the budget value as the maximum fee rate (or the max fee
+	cap). If no starting fee rate is provided the block estimation with
+	the value 5 will be used as a starting fee rate but the max fee rate
+	remains the same.`,
+		},
 	},
 	Action: actionDecorator(bumpFee),
 }
@@ -344,11 +364,12 @@ func bumpFee(ctx *cli.Context) error {
 	}
 
 	resp, err := client.BumpFee(ctxc, &walletrpc.BumpFeeRequest{
-		Outpoint:    protoOutPoint,
-		TargetConf:  uint32(ctx.Uint64("conf_target")),
-		Immediate:   immediate,
-		Budget:      ctx.Uint64("budget"),
-		SatPerVbyte: ctx.Uint64("sat_per_vbyte"),
+		Outpoint:      protoOutPoint,
+		TargetConf:    uint32(ctx.Uint64("conf_target")),
+		Immediate:     immediate,
+		Budget:        ctx.Uint64("budget"),
+		SatPerVbyte:   ctx.Uint64("sat_per_vbyte"),
+		DeadlineDelta: ctx.Uint64("deadline-delta"),
 	})
 	if err != nil {
 		return err