1 files changed, 77 insertions, 0 deletions
diff --git a/daemon/bindings/modules.c b/daemon/bindings/modules.c
new file mode 100644
index 0000000..acae270
--- /dev/null
+++ b/daemon/bindings/modules.c
@@ -0,0 +1,77 @@
+/*  Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
+ *  SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "daemon/bindings/impl.h"
+
+
+/** List loaded modules */
+static int mod_list(lua_State *L)
+{
+	const module_array_t * const modules = &the_worker->engine->modules;
+	lua_newtable(L);
+	for (unsigned i = 0; i < modules->len; ++i) {
+		struct kr_module *module = modules->at[i];
+		lua_pushstring(L, module->name);
+		lua_rawseti(L, -2, i + 1);
+	}
+	return 1;
+}
+
+/** Load module. */
+static int mod_load(lua_State *L)
+{
+	/* Check parameters */
+	int n = lua_gettop(L);
+	if (n != 1 || !lua_isstring(L, 1))
+		lua_error_p(L, "expected 'load(string name)'");
+	/* Parse precedence declaration */
+	char *declaration = strdup(lua_tostring(L, 1));
+	if (!declaration)
+		return kr_error(ENOMEM);
+	const char *name = strtok(declaration, " ");
+	const char *precedence = strtok(NULL, " ");
+	const char *ref = strtok(NULL, " ");
+	/* Load engine module */
+	int ret = engine_register(the_worker->engine, name, precedence, ref);
+	free(declaration);
+	if (ret != 0) {
+		if (ret == kr_error(EIDRM)) {
+			lua_error_p(L, "referenced module not found");
+		} else {
+			lua_error_maybe(L, ret);
+		}
+	}
+
+	lua_pushboolean(L, 1);
+	return 1;
+}
+
+/** Unload module. */
+static int mod_unload(lua_State *L)
+{
+	/* Check parameters */
+	int n = lua_gettop(L);
+	if (n != 1 || !lua_isstring(L, 1))
+		lua_error_p(L, "expected 'unload(string name)'");
+	/* Unload engine module */
+	int ret = engine_unregister(the_worker->engine, lua_tostring(L, 1));
+	lua_error_maybe(L, ret);
+
+	lua_pushboolean(L, 1);
+	return 1;
+}
+
+int kr_bindings_modules(lua_State *L)
+{
+	static const luaL_Reg lib[] = {
+		{ "list",   mod_list },
+		{ "load",   mod_load },
+		{ "unload", mod_unload },
+		{ NULL, NULL }
+	};
+
+	luaL_register(L, "modules", lib);
+	return 1;
+}
+