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#include <string>
#include <lua.hpp>
#include "common/ceph_context.h"
#include "common/debug.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(FIRST_UPVAL)));
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) {
const auto 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_typename(L, i) << "]: ";
switch (lua_type(L, i)) {
case LUA_TNUMBER:
std::cout << lua_tonumber(L, i);
break;
case LUA_TSTRING:
std::cout << lua_tostring(L, i);
break;
case LUA_TBOOLEAN:
std::cout << (lua_toboolean(L, i) ? "true" : "false");
break;
case LUA_TNIL:
std::cout << "nil";
break;
default:
std::cout << lua_topointer(L, i);
break;
}
std::cout << std::endl;
}
std::cout << "--------------- Stack Dump Finished ---------------" << std::endl;
}
void set_package_path(lua_State* L, const std::string& install_dir) {
if (install_dir.empty()) {
return;
}
if (lua_getglobal(L, "package") != LUA_TTABLE) {
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;"+install_dir+"/lib64/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()
if (lua_getglobal(L, "os") == LUA_TTABLE) {
lua_pushstring(L, "exit");
lua_pushnil(L);
lua_settable(L, -3);
}
}
// allocator function that verifies against maximum allowed memory value
void* allocator(void* ud, void* ptr, std::size_t osize, std::size_t nsize) {
auto mem = reinterpret_cast<std::size_t*>(ud); // remaining memory
// free memory
if (nsize == 0) {
if (mem && ptr) {
*mem += osize;
}
free(ptr);
return nullptr;
}
// re/alloc memory
if (mem) {
const std::size_t realloc_size = ptr ? osize : 0;
if (nsize > realloc_size && (nsize - realloc_size) > *mem) {
return nullptr;
}
*mem += realloc_size;
*mem -= nsize;
}
return realloc(ptr, nsize);
}
// create new lua state together with its memory counter
lua_State* newstate(int max_memory) {
std::size_t* remaining_memory = nullptr;
if (max_memory > 0) {
remaining_memory = new std::size_t(max_memory);
}
lua_State* L = lua_newstate(allocator, remaining_memory);
if (!L) {
delete remaining_memory;
remaining_memory = nullptr;
}
if (L) {
lua_atpanic(L, [](lua_State* L) -> int {
const char* msg = lua_tostring(L, -1);
if (msg == nullptr) msg = "error object is not a string";
throw std::runtime_error(msg);
});
}
return L;
}
// lua_state_guard ctor
lua_state_guard::lua_state_guard(std::size_t _max_memory, const DoutPrefixProvider* _dpp) :
max_memory(_max_memory),
dpp(_dpp),
state(newstate(_max_memory)) {
if (state && perfcounter) {
perfcounter->inc(l_rgw_lua_current_vms, 1);
}
}
// lua_state_guard dtor
lua_state_guard::~lua_state_guard() {
lua_State* L = state;
if (!L) {
return;
}
void* ud = nullptr;
lua_getallocf(L, &ud);
auto remaining_memory = static_cast<std::size_t*>(ud);
if (remaining_memory) {
const auto used_memory = max_memory - *remaining_memory;
ldpp_dout(dpp, 20) << "Lua is using: " << used_memory <<
" bytes (" << 100.0*used_memory/max_memory << "%)" << dendl;
// dont limit memory during cleanup
*remaining_memory = 0;
}
try {
lua_close(L);
} catch (const std::runtime_error& e) {
ldpp_dout(dpp, 20) << "Lua cleanup failed with: " << e.what() << dendl;
}
// TODO: use max_memory and remaining memory to check for leaks
// this could be done only if we don't zero the remianing memory during clanup
delete remaining_memory;
if (perfcounter) {
perfcounter->dec(l_rgw_lua_current_vms, 1);
}
}
} // namespace rgw::lua
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