multi: add ProtocolVersion_HTLC_V3

loopdb/protocol_version.go

@@ -51,13 +51,17 @@ const (
 	// in order to enhance off-chain payments corresponding to a swap.
 	ProtocolVersionRoutingPlugin = 9
 
+	// ProtocolVersionHtlcV3 indicates that the client will now use the new
+	// HTLC v3 (P2TR) script for swaps.
+	ProtocolVersionHtlcV3 = 10
+
 	// ProtocolVersionUnrecorded is set for swaps were created before we
 	// started saving protocol version with swaps.
 	ProtocolVersionUnrecorded ProtocolVersion = math.MaxUint32
 
 	// CurrentRPCProtocolVersion defines the version of the RPC protocol
 	// that is currently supported by the loop client.
-	CurrentRPCProtocolVersion = looprpc.ProtocolVersion_ROUTING_PLUGIN
+	CurrentRPCProtocolVersion = looprpc.ProtocolVersion_HTLC_V3
 
 	// CurrentInternalProtocolVersion defines the RPC current protocol in
 	// the internal representation.
@@ -102,6 +106,9 @@ func (p ProtocolVersion) String() string {
 	case ProtocolVersionRoutingPlugin:
 		return "Routing Plugin"
 
+	case ProtocolVersionHtlcV3:
+		return "HTLC V3"
+
 	default:
 		return "Unknown"
 	}

loopdb/protocol_version_test.go

@@ -24,6 +24,7 @@ func TestProtocolVersionSanity(t *testing.T) {
 		ProtocolVersionLoopOutCancel,
 		ProtocolVersionProbe,
 		ProtocolVersionRoutingPlugin,
+		ProtocolVersionHtlcV3,
 	}
 
 	rpcVersions := [...]looprpc.ProtocolVersion{
@@ -37,6 +38,7 @@ func TestProtocolVersionSanity(t *testing.T) {
 		looprpc.ProtocolVersion_LOOP_OUT_CANCEL,
 		looprpc.ProtocolVersion_PROBE,
 		looprpc.ProtocolVersion_ROUTING_PLUGIN,
+		looprpc.ProtocolVersion_HTLC_V3,
 	}
 
 	require.Equal(t, len(versions), len(rpcVersions))