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[Quest API] Add tracebacks to Lua error messages (#4079)

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This adds an error msg handler for lua calls to add a stack trace to
error messages. Lua 5.1 does not have luaL_traceback like luajit and lua
5.2+ so debug.traceback() is used directly as the msg handler.

The traceback will add more detail to errors than just logging package
and event names. Exceptions in C++ binds and luabind errors will now
show script context instead of just the error message.

e.g., for a luabind overload error:

  No matching overload found, candidates:
  void signal(int,int,int)
  void signal(int,int)
  stack traceback:
    [C]: in function 'signal'
    quests/arena/player.lua:10: in function 'somefn'
    quests/arena/player.lua:27: in function <quests/arena/player.lua:17>
This commit is contained in:
hg 2024-02-16 01:27:37 -05:00 committed by GitHub
parent 447fc026a8
commit 86f39743fc
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 37 additions and 22 deletions
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59
zone/lua_parser.cpp
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@ -190,6 +190,14 @@ std::map<std::string, std::list<lua_registered_event>> lua_encounter_events_regi
std::map<std::string, bool> lua_encounters_loaded;
std::map<std::string, Encounter *> lua_encounters;
// use debug.traceback() for errors (luaL_traceback is only in luajit and lua 5.2+)
static void PushErrorHandler(lua_State* L)
{
lua_getglobal(L, "debug");
lua_getfield(L, -1, "traceback");
lua_remove(L, -2);
}
LuaParser::LuaParser() {
for (int i = 0; i < _LargestEventID; ++i) {
NPCArgumentDispatch[i] = handle_npc_null;
@ -416,13 +424,14 @@ int LuaParser::_EventNPC(std::string package_name, QuestEventID evt, NPC* npc, M
int start = lua_gettop(L);
try {
int npop = 1;
int npop = 2;
PushErrorHandler(L);
if(l_func != nullptr) {
l_func->push(L);
} else {
lua_getfield(L, LUA_REGISTRYINDEX, package_name.c_str());
lua_getfield(L, -1, sub_name);
npop = 2;
npop = 3;
}
lua_createtable(L, 0, 0);
@ -437,7 +446,7 @@ int LuaParser::_EventNPC(std::string package_name, QuestEventID evt, NPC* npc, M
Client *c = (init && init->IsClient()) ? init->CastToClient() : nullptr;
quest_manager.StartQuest(npc, c);
if(lua_pcall(L, 1, 1, 0)) {
if(lua_pcall(L, 1, 1, start + 1)) {
std::string error = lua_tostring(L, -1);
AddError(error);
quest_manager.EndQuest();
@ -509,13 +518,14 @@ int LuaParser::_EventPlayer(std::string package_name, QuestEventID evt, Client *
int start = lua_gettop(L);
try {
int npop = 1;
int npop = 2;
PushErrorHandler(L);
if(l_func != nullptr) {
l_func->push(L);
} else {
lua_getfield(L, LUA_REGISTRYINDEX, package_name.c_str());
lua_getfield(L, -1, sub_name);
npop = 2;
npop = 3;
}
lua_createtable(L, 0, 0);
@ -529,7 +539,7 @@ int LuaParser::_EventPlayer(std::string package_name, QuestEventID evt, Client *
arg_function(this, L, client, data, extra_data, extra_pointers);
quest_manager.StartQuest(client, client);
if(lua_pcall(L, 1, 1, 0)) {
if(lua_pcall(L, 1, 1, start + 1)) {
std::string error = lua_tostring(L, -1);
AddError(error);
quest_manager.EndQuest();
@ -586,13 +596,14 @@ int LuaParser::_EventItem(std::string package_name, QuestEventID evt, Client *cl
int start = lua_gettop(L);
try {
int npop = 1;
int npop = 2;
PushErrorHandler(L);
if(l_func != nullptr) {
l_func->push(L);
} else {
lua_getfield(L, LUA_REGISTRYINDEX, package_name.c_str());
lua_getfield(L, -1, sub_name);
npop = 2;
npop = 3;
}
lua_createtable(L, 0, 0);
@ -612,7 +623,7 @@ int LuaParser::_EventItem(std::string package_name, QuestEventID evt, Client *cl
arg_function(this, L, client, item, mob, data, extra_data, extra_pointers);
quest_manager.StartQuest(client, client, item);
if(lua_pcall(L, 1, 1, 0)) {
if(lua_pcall(L, 1, 1, start + 1)) {
std::string error = lua_tostring(L, -1);
AddError(error);
quest_manager.EndQuest();
@ -666,13 +677,14 @@ int LuaParser::_EventSpell(std::string package_name, QuestEventID evt, Mob* mob,
int start = lua_gettop(L);
try {
int npop = 1;
int npop = 2;
PushErrorHandler(L);
if(l_func != nullptr) {
l_func->push(L);
} else {
lua_getfield(L, LUA_REGISTRYINDEX, package_name.c_str());
lua_getfield(L, -1, sub_name);
npop = 2;
npop = 3;
}
lua_createtable(L, 0, 0);
@ -693,7 +705,7 @@ int LuaParser::_EventSpell(std::string package_name, QuestEventID evt, Mob* mob,
arg_function(this, L, mob, client, spell_id, data, extra_data, extra_pointers);
quest_manager.StartQuest(mob, client, nullptr, const_cast<SPDat_Spell_Struct*>(&spells[spell_id]));
if(lua_pcall(L, 1, 1, 0)) {
if(lua_pcall(L, 1, 1, start + 1)) {
std::string error = lua_tostring(L, -1);
AddError(error);
quest_manager.EndQuest();
@ -745,6 +757,7 @@ int LuaParser::_EventEncounter(std::string package_name, QuestEventID evt, std::
int start = lua_gettop(L);
try {
PushErrorHandler(L);
lua_getfield(L, LUA_REGISTRYINDEX, package_name.c_str());
lua_getfield(L, -1, sub_name);
@ -758,22 +771,22 @@ int LuaParser::_EventEncounter(std::string package_name, QuestEventID evt, std::
arg_function(this, L, enc, data, extra_data, extra_pointers);
quest_manager.StartQuest(enc, nullptr, nullptr, nullptr, encounter_name);
if(lua_pcall(L, 1, 1, 0)) {
if(lua_pcall(L, 1, 1, start + 1)) {
std::string error = lua_tostring(L, -1);
AddError(error);
quest_manager.EndQuest();
lua_pop(L, 2);
lua_pop(L, 3);
return 0;
}
quest_manager.EndQuest();
if(lua_isnumber(L, -1)) {
int ret = static_cast<int>(lua_tointeger(L, -1));
lua_pop(L, 2);
lua_pop(L, 3);
return ret;
}
lua_pop(L, 2);
lua_pop(L, 3);
} catch(std::exception &ex) {
AddError(fmt::format("Lua Exception | [{}] for Encounter [{}]: {}", sub_name, encounter_name, ex.what()));
@ -1124,10 +1137,11 @@ void LuaParser::LoadScript(std::string filename, std::string package_name) {
}
auto top = lua_gettop(L);
PushErrorHandler(L);
if(luaL_loadfile(L, filename.c_str())) {
std::string error = lua_tostring(L, -1);
AddError(error);
lua_pop(L, 1);
lua_pop(L, 2);
return;
}
@ -1147,10 +1161,10 @@ void LuaParser::LoadScript(std::string filename, std::string package_name) {
lua_setfenv(L, -2); //set the env to the table we made
if(lua_pcall(L, 0, 0, 0)) {
if(lua_pcall(L, 0, 0, top + 1)) {
std::string error = lua_tostring(L, -1);
AddError(error);
lua_pop(L, 1);
lua_pop(L, 2);
}
else {
loaded_[package_name] = true;
@ -1599,13 +1613,14 @@ int LuaParser::_EventBot(
int start = lua_gettop(L);
try {
int npop = 1;
int npop = 2;
PushErrorHandler(L);
if(l_func != nullptr) {
l_func->push(L);
} else {
lua_getfield(L, LUA_REGISTRYINDEX, package_name.c_str());
lua_getfield(L, -1, sub_name);
npop = 2;
npop = 3;
}
lua_createtable(L, 0, 0);
@ -1620,7 +1635,7 @@ int LuaParser::_EventBot(
auto* c = (init && init->IsClient()) ? init->CastToClient() : nullptr;
quest_manager.StartQuest(bot, c);
if(lua_pcall(L, 1, 1, 0)) {
if(lua_pcall(L, 1, 1, start + 1)) {
std::string error = lua_tostring(L, -1);
AddError(error);
quest_manager.EndQuest();