1 files changed, 76 insertions, 0 deletions
diff --git a/src/rgw/rgw_lua_utils.cc b/src/rgw/rgw_lua_utils.cc
new file mode 100644
index 000000000..6af87d2c0
--- /dev/null
+++ b/src/rgw/rgw_lua_utils.cc
@@ -0,0 +1,76 @@
+#include <string>
+#include <lua.hpp>
+#include "common/ceph_context.h"
+#include "common/dout.h"
+#include "rgw_lua_utils.h"
+#include "rgw_lua_version.h"
+
+#define dout_subsys ceph_subsys_rgw
+
+namespace rgw::lua {
+
+// TODO - add the folowing generic functions
+// lua_push(lua_State* L, const std::string& str)
+// template<typename T> lua_push(lua_State* L, const std::optional<T>& val)
+// lua_push(lua_State* L, const ceph::real_time& tp)
+
+constexpr const char* RGWDebugLogAction{"RGWDebugLog"};
+
+int RGWDebugLog(lua_State* L) 
+{
+  auto cct = reinterpret_cast<CephContext*>(lua_touserdata(L, lua_upvalueindex(1)));
+
+  auto message = luaL_checkstring(L, 1);
+  ldout(cct, 20) << "Lua INFO: " << message << dendl;
+  return 0;
+}
+
+void create_debug_action(lua_State* L, CephContext* cct) {
+  lua_pushlightuserdata(L, cct);
+  lua_pushcclosure(L, RGWDebugLog, ONE_UPVAL);
+  lua_setglobal(L, RGWDebugLogAction);
+}
+
+void stack_dump(lua_State* L) {
+  int top = lua_gettop(L);
+  std::cout << std::endl << " ----------------  Stack Dump ----------------" << std::endl;
+  std::cout << "Stack Size: " << top << std::endl;
+  for (int i = 1, j = -top; i <= top; i++, j++) {
+    std::cout << "[" << i << "," << j << "]: " << luaL_tolstring(L, i, NULL) << std::endl;
+    lua_pop(L, 1);
+  }
+  std::cout << "--------------- Stack Dump Finished ---------------" << std::endl;
+}
+
+void set_package_path(lua_State* L, const std::string& install_dir) {
+  if (install_dir.empty()) {
+    return;
+  }
+  lua_getglobal(L, "package");
+  if (!lua_istable(L, -1)) {
+    return;
+  }
+  const auto path = install_dir+"/share/lua/"+CEPH_LUA_VERSION+"/?.lua";  
+  pushstring(L, path);
+  lua_setfield(L, -2, "path");
+  
+  const auto cpath = install_dir+"/lib/lua/"+CEPH_LUA_VERSION+"/?.so";
+  pushstring(L, cpath);
+  lua_setfield(L, -2, "cpath");
+}
+
+void open_standard_libs(lua_State* L) {
+  luaL_openlibs(L);
+  unsetglobal(L, "load");
+  unsetglobal(L, "loadfile");
+  unsetglobal(L, "loadstring");
+  unsetglobal(L, "dofile");
+  unsetglobal(L, "debug");
+  // remove os.exit()
+  lua_getglobal(L, "os");
+  lua_pushstring(L, "exit");
+  lua_pushnil(L);
+  lua_settable(L, -3);
+}
+
+}