add 'dump' ubus method to dump topology

src/ubus.c

@@ -346,13 +346,58 @@ int hostmngr_get_interface_network(struct hostmngr_private *priv)
 	return ret;
 }
 
-int hostmngr_ubus_neighbors(struct ubus_context *ctx, struct ubus_object *obj,
+void hostmngr_topology_dump_cb(struct ubus_request *req, int type, struct blob_attr *msg)
+{
+	struct blob_buf *bb = (struct blob_buf *)req->priv;
+	struct json_object *jmsg;
+	char *jstr;
+
+	blob_buf_init(bb, 0);
+	jstr = blobmsg_format_json(msg, true);
+	if (!jstr)
+		return;
+
+	jmsg = json_tokener_parse(jstr);
+	if (!jmsg)
+		goto out_str;
+
+	if (!json_object_is_type(jmsg, json_type_object))
+		goto out_json;
+
+	if (!blobmsg_add_json_from_string(bb, jstr))
+		dbg("%s: blobmsg from json-string error\n", __func__);
+
+out_json:
+	json_object_put(jmsg);
+out_str:
+	free(jstr);
+}
+
+int hostmngr_ubus_dump_topology(struct ubus_context *ctx, struct ubus_object *obj,
 			struct ubus_request_data *req, const char *method,
 			struct blob_attr *msg)
 {
-	//struct hostmngr_private *p = container_of(obj, struct i1905_private, obj);
+	struct hostmngr_private *p = container_of(obj, struct hostmngr_private, obj);
+	const char *topology_objname = "topology";
+	struct blob_buf bi = {0};
+	struct blob_buf bo = {0};
+	uint32_t id;
 	int ret = 0;
 
+	id = lookup_object(p->bus, topology_objname);
+	if (id == OBJECT_INVALID)
+		return UBUS_STATUS_NOT_FOUND;
+
+	/* ubus call topology dump */
+	blob_buf_init(&bi, 0);
+	ret = ubus_invoke(p->bus, id, "dump", bi.head,
+			  hostmngr_topology_dump_cb, &bo, 2000);
+	if (ret == UBUS_STATUS_OK)
+		ubus_send_reply(ctx, req, bo.head);
+
+	blob_buf_free(&bi);
+	blob_buf_free(&bo);
+
 	return ret;
 }
 
@@ -705,9 +750,9 @@ int hostmngr_publish_object(struct hostmngr_private *p, const char *objname)
 	struct ubus_object *obj;
 	struct ubus_method m[5] = {
 		UBUS_METHOD_NOARG("show", hostmngr_ubus_show_hosts),
+		UBUS_METHOD_NOARG("dump", hostmngr_ubus_dump_topology),
 		UBUS_METHOD_NOARG("history", hostmngr_ubus_show_history),
 		UBUS_METHOD_NOARG("arptable", hostmngr_ubus_show_arptable),
-		UBUS_METHOD_NOARG("neighbors", hostmngr_ubus_neighbors),
 		UBUS_METHOD_NOARG("debug", hostmngr_ubus_debug_output),
 	};
 	int num_methods = ARRAY_SIZE(m);