From 257d49a97ca96348754e5e9f939f7943171393e2 Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Thu, 7 Apr 2016 23:11:19 +0100
Subject: [PATCH] [Feature] Allow to get callbacks for lua symbols

---
 src/lua/lua_config.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/src/lua/lua_config.c b/src/lua/lua_config.c
index 5c4acf02c..2317a0b87 100644
--- a/src/lua/lua_config.c
+++ b/src/lua/lua_config.c
@@ -411,6 +411,13 @@ LUA_FUNCTION_DEF (config, add_on_load);
  */
 LUA_FUNCTION_DEF (config, get_symbols_count);
 
+/***
+ * @method rspamd_config:get_symbol_callback(name)
+ * Returns callback function for the specified symbol if it is a lua registered callback
+ * @return {function} callback function or nil
+ */
+LUA_FUNCTION_DEF (config, get_symbol_callback);
+
 static const struct luaL_reg configlib_m[] = {
 	LUA_INTERFACE_DEF (config, get_module_opt),
 	LUA_INTERFACE_DEF (config, get_mempool),
@@ -441,6 +448,7 @@ static const struct luaL_reg configlib_m[] = {
 	LUA_INTERFACE_DEF (config, register_worker_script),
 	LUA_INTERFACE_DEF (config, add_on_load),
 	LUA_INTERFACE_DEF (config, get_symbols_count),
+	LUA_INTERFACE_DEF (config, get_symbol_callback),
 	{"__tostring", rspamd_lua_class_tostring},
 	{"__newindex", lua_config_newindex},
 	{NULL, NULL}
@@ -1738,6 +1746,38 @@ lua_config_get_symbols_count (lua_State *L)
 	return 1;
 }
 
+static gint
+lua_config_get_symbol_callback (lua_State *L)
+{
+	struct rspamd_config *cfg = lua_check_config (L, 1);
+	const gchar *sym = luaL_checkstring (L, 2);
+	struct rspamd_abstract_callback_data *abs_cbdata;
+	struct lua_callback_data *cbd;
+
+	if (cfg != NULL && sym != NULL) {
+		abs_cbdata = rspamd_symbols_cache_get_cbdata (cfg->cache, sym);
+
+		if (abs_cbdata == NULL || abs_cbdata->magic != rspamd_lua_callback_magic) {
+			lua_pushnil (L);
+		}
+		else {
+			cbd = (struct lua_callback_data *)abs_cbdata;
+
+			if (cbd->cb_is_ref) {
+				lua_rawgeti (L, LUA_REGISTRYINDEX, cbd->callback.ref);
+			}
+			else {
+				lua_getglobal (L, cbd->callback.name);
+			}
+		}
+	}
+	else {
+		return luaL_error (L, "invalid arguments");
+	}
+
+	return 1;
+}
+
 void
 luaopen_config (lua_State * L)
 {
-- 
2.39.5