lncli: validate negative sat_per_vbyte in closechannel

cmd/commands/cmd_open_channel.go

@@ -170,7 +170,7 @@ var openChannelCommand = cli.Command{
 			Usage:  "Deprecated, use sat_per_vbyte instead.",
 			Hidden: true,
 		},
-		cli.Int64Flag{
+		cli.Uint64Flag{
 			Name: "sat_per_vbyte",
 			Usage: "(optional) a manual fee expressed in " +
 				"sat/vbyte that should be used when crafting " +
@@ -797,7 +797,7 @@ var batchOpenChannelCommand = cli.Command{
 				"transaction *should* confirm in, will be " +
 				"used for fee estimation",
 		},
-		cli.Int64Flag{
+		cli.Uint64Flag{
 			Name: "sat_per_vbyte",
 			Usage: "(optional) a manual fee expressed in " +
 				"sat/vByte that should be used when crafting " +

cmd/commands/commands.go

@@ -483,7 +483,7 @@ var sendCoinsCommand = cli.Command{
 			Usage:  "Deprecated, use sat_per_vbyte instead.",
 			Hidden: true,
 		},
-		cli.Int64Flag{
+		cli.Uint64Flag{
 			Name: "sat_per_vbyte",
 			Usage: "(optional) a manual fee expressed in " +
 				"sat/vbyte that should be used when crafting " +
@@ -822,7 +822,7 @@ var sendManyCommand = cli.Command{
 			Usage:  "Deprecated, use sat_per_vbyte instead.",
 			Hidden: true,
 		},
-		cli.Int64Flag{
+		cli.Uint64Flag{
 			Name: "sat_per_vbyte",
 			Usage: "(optional) a manual fee expressed in " +
 				"sat/vbyte that should be used when crafting " +
@@ -1073,7 +1073,7 @@ var closeChannelCommand = cli.Command{
 			Usage:  "Deprecated, use sat_per_vbyte instead.",
 			Hidden: true,
 		},
-		cli.Int64Flag{
+		cli.Uint64Flag{
 			Name: "sat_per_vbyte",
 			Usage: "(optional) a manual fee expressed in " +
 				"sat/vbyte that should be used when crafting " +
@@ -1277,7 +1277,7 @@ var closeAllChannelsCommand = cli.Command{
 			Usage:  "Deprecated, use sat_per_vbyte instead.",
 			Hidden: true,
 		},
-		cli.Int64Flag{
+		cli.Uint64Flag{
 			Name: "sat_per_vbyte",
 			Usage: "(optional) a manual fee expressed in " +
 				"sat/vbyte that should be used when crafting " +

cmd/commands/commands_test.go

@@ -492,3 +492,159 @@ func TestParseChanIDs(t *testing.T) {
 		})
 	}
 }
+
+// TestSatPerVByteFlagParsing tests parsing of various commands.
+func TestSatPerVByteFlagParsing(t *testing.T) {
+	t.Parallel()
+
+	testCases := []struct {
+		name           string
+		cmd            cli.Command
+		args           []string
+		expectedErrMsg string
+	}{
+		{
+			name: "closechannel valid",
+			cmd:  closeChannelCommand,
+			args: []string{
+				"lncli", "closechannel",
+				"--sat_per_vbyte", "30",
+			},
+		},
+		{
+			name: "closechannel valid, zero feerate",
+			cmd:  closeChannelCommand,
+			args: []string{
+				"lncli", "closechannel",
+				"--sat_per_vbyte", "0",
+			},
+		},
+		{
+			name: "closechannel valid, max u64 feerate",
+			cmd:  closeChannelCommand,
+			args: []string{
+				"lncli", "closechannel",
+				"--sat_per_vbyte",
+				strconv.FormatUint(math.MaxUint64, 10),
+			},
+		},
+		{
+			name: "closechannel invalid, negative feerate",
+			cmd:  closeChannelCommand,
+			args: []string{
+				"lncli", "closechannel",
+				"--sat_per_vbyte", "-1",
+			},
+			expectedErrMsg: "parse error",
+		},
+		{
+			name: "closechannel invalid, non-numeric feerate",
+			cmd:  closeChannelCommand,
+			args: []string{
+				"lncli", "closechannel",
+				"--sat_per_vbyte", "abc",
+			},
+			expectedErrMsg: "parse error",
+		},
+		{
+			name: "channelopen valid",
+			cmd:  openChannelCommand,
+			args: []string{
+				"lncli", "openchannel",
+				"--sat_per_vbyte", "50",
+				"--node_key", "pubkey",
+				"--local_amt", "100000",
+			},
+		},
+		{
+			name: "channelopen invalid, negative feerate",
+			cmd:  openChannelCommand,
+			args: []string{
+				"lncli", "openchannel",
+				"--sat_per_vbyte", "-1",
+				"--node_key", "pubkey",
+				"--local_amt", "100000",
+			},
+			expectedErrMsg: "parse error",
+		},
+		{
+			name: "sendcoins valid",
+			cmd:  sendCoinsCommand,
+			args: []string{
+				"lncli", "sendcoins",
+				"--sat_per_vbyte", "30",
+				"--addr", "bc1qexample",
+				"--amt", "1000",
+			},
+		},
+		{
+			name: "sendcoins invalid, negative feerate",
+			cmd:  sendCoinsCommand,
+			args: []string{
+				"lncli", "sendcoins",
+				"--sat_per_vbyte", "-1",
+				"--addr", "bc1qexample",
+				"--amt", "1000",
+			},
+			expectedErrMsg: "parse error",
+		},
+		{
+			name: "sendmany valid",
+			cmd:  sendManyCommand,
+			args: []string{
+				"lncli", "sendmany",
+				"--sat_per_vbyte", "40",
+				`{"bc1qexample": 500}`,
+			},
+		},
+		{
+			name: "sendmany invalid, negative feerate",
+			cmd:  sendManyCommand,
+			args: []string{
+				"lncli", "sendmany",
+				"--sat_per_vbyte", "-1",
+				`{"bc1qexample": 500}`,
+			},
+			expectedErrMsg: "parse error",
+		},
+		{
+			name: "closeallchannels valid",
+			cmd:  closeAllChannelsCommand,
+			args: []string{
+				"lncli", "closeallchannels",
+				"--sat_per_vbyte", "60",
+			},
+		},
+		{
+			name: "closeallchannels invalid, negative feerate",
+			cmd:  closeAllChannelsCommand,
+			args: []string{
+				"lncli", "closeallchannels",
+				"--sat_per_vbyte", "-1",
+			},
+			expectedErrMsg: "parse error",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			cmd := tc.cmd
+
+			// Disable the action so action doesn't run.
+			cmd.Action = func(ctx *cli.Context) error {
+				return nil
+			}
+
+			app := &cli.App{
+				Commands: []cli.Command{cmd},
+			}
+
+			err := app.Run(tc.args)
+			if tc.expectedErrMsg != "" {
+				require.ErrorContains(t, err, tc.expectedErrMsg)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}

docs/release-notes/release-notes-0.21.0.md

@@ -20,6 +20,10 @@
 - [Contributors (Alphabetical Order)](#contributors)
 
 # Bug Fixes
+- [Fixed](https://github.com/lightningnetwork/lnd/pull/9155) error messages 
+for `lncli closechannel` to clarify mempool fee issues and pending close state, 
+guiding users to use `lncli bumpfee` and check `lncli pendingchannels` for 
+actionable troubleshooting.
 
 # New Features
 ## Functional Enhancements
@@ -53,3 +57,4 @@
 ## Tooling and Documentation
 
 # Contributors (Alphabetical Order)
+* Suvrat1629