plugin: Register `invoice_payment` notification

lightningd/notification.c

@@ -5,7 +5,6 @@
 #include <lightningd/peer_htlcs.h>
 
 const char *notification_topics[] = {
-	"invoice_payment",
 	"channel_opened",
 	"forward_event"
 };
@@ -119,17 +118,33 @@ void notify_warning(struct lightningd *ld, struct log_entry *l)
 	plugins_notify(ld->plugins, take(n));
 }
 
+static void invoice_payment_notification_serialize(struct json_stream *stream,
+						   struct amount_msat amount,
+						   struct preimage preimage,
+						   const struct json_escape *label)
+{
+	json_object_start(stream, "invoice_payment");
+	json_add_string(stream, "msat",
+			type_to_string(tmpctx, struct amount_msat, &amount));
+	json_add_hex(stream, "preimage", &preimage, sizeof(preimage));
+	json_add_escaped_string(stream, "label", label);
+	json_object_end(stream);
+}
+
+REGISTER_NOTIFICATION(invoice_payment,
+		      invoice_payment_notification_serialize)
+
 void notify_invoice_payment(struct lightningd *ld, struct amount_msat amount,
 			    struct preimage preimage, const struct json_escape *label)
 {
-	struct jsonrpc_notification *n =
-		jsonrpc_notification_start(NULL, "invoice_payment");
-	json_object_start(n->stream, "invoice_payment");
-	json_add_string(n->stream, "msat",
-			type_to_string(tmpctx, struct amount_msat, &amount));
-	json_add_hex(n->stream, "preimage", &preimage, sizeof(preimage));
-	json_add_escaped_string(n->stream, "label", label);
-	json_object_end(n->stream);
+	void (*serialize)(struct json_stream *,
+			  struct amount_msat,
+			  struct preimage,
+			  const struct json_escape *) = invoice_payment_notification_gen.serialize;
+
+	struct jsonrpc_notification *n
+		= jsonrpc_notification_start(NULL, invoice_payment_notification_gen.topic);
+	serialize(n->stream, amount, preimage, label);
 	jsonrpc_notification_end(n);
 	plugins_notify(ld->plugins, take(n));
 }