[Fix] Add full Lua traceback to HTTP callback errors

Improved error diagnostics in lua_http_finish_handler by adding
rspamd_lua_traceback handler. Now shows complete call stack with
file names and line numbers when Lua HTTP callbacks fail, making
debugging much easier.

diff --git a/src/lua/lua_http.c b/src/lua/lua_http.c
index 24452f17159907e00e997cccc2e70cacff233e15..3330bc6ea5078d7cd40235a586cd9b4ef245efe3 100644 (file)
--- a/src/lua/lua_http.c
+++ b/src/lua/lua_http.c
@@ -377,6 +377,9 @@ lua_http_finish_handler(struct rspamd_http_connection *conn,
 
        L = lcbd.L;
 
+       lua_pushcfunction(L, &rspamd_lua_traceback);
+       int err_idx = lua_gettop(L);
+
        lua_rawgeti(L, LUA_REGISTRYINDEX, cbd->cbref);
        /* Error */
        lua_pushnil(L);
@@ -420,11 +423,13 @@ lua_http_finish_handler(struct rspamd_http_connection *conn,
                rspamd_symcache_set_cur_item(cbd->task, cbd->item);
        }
 
-       if (lua_pcall(L, 4, 0, 0) != 0) {
+       if (lua_pcall(L, 4, 0, err_idx) != 0) {
                msg_info("callback call failed: %s", lua_tostring(L, -1));
                lua_pop(L, 1);
        }
 
+       lua_pop(L, 1); /* Remove traceback function */
+
        REF_RELEASE(cbd);
 
        lua_thread_pool_restore_callback(&lcbd);