From f5070b44542edba97a20445c3774c221077cc4a2 Mon Sep 17 00:00:00 2001
From: sapier <sapier@users.noreply.github.com>
Date: Sun, 15 Jan 2017 13:36:53 +0100
Subject: Added lua tracebacks to some errors where you have been blind to
 what… (#5043)
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* Added lua tracebacks to some errors where you have been blind to what actually went wrong
---
 src/emerge.cpp                    |  2 +-
 src/script/common/c_converter.cpp |  4 +++-
 src/script/cpp_api/s_env.cpp      | 12 +++++++++---
 src/server.cpp                    |  5 +++--
 4 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/src/emerge.cpp b/src/emerge.cpp
index 3f0a46010..1c9719c48 100644
--- a/src/emerge.cpp
+++ b/src/emerge.cpp
@@ -564,7 +564,7 @@ MapBlock *EmergeThread::finishGen(v3s16 pos, BlockMakeData *bmdata,
 		m_server->getScriptIface()->environment_OnGenerated(
 			minp, maxp, m_mapgen->blockseed);
 	} catch (LuaError &e) {
-		m_server->setAsyncFatalError("Lua: " + std::string(e.what()));
+		m_server->setAsyncFatalError("Lua: finishGen" + std::string(e.what()));
 	}
 
 	EMERGE_DBG_OUT("ended up with: " << analyze_block(block));
diff --git a/src/script/common/c_converter.cpp b/src/script/common/c_converter.cpp
index f36298915..fc516d56a 100644
--- a/src/script/common/c_converter.cpp
+++ b/src/script/common/c_converter.cpp
@@ -26,15 +26,17 @@ extern "C" {
 #include "util/serialize.h"
 #include "util/string.h"
 #include "common/c_converter.h"
+#include "common/c_internal.h"
 #include "constants.h"
 
 
 #define CHECK_TYPE(index, name, type) do { \
 		int t = lua_type(L, (index)); \
 		if (t != (type)) { \
+			std::string traceback = script_get_backtrace(L); \
 			throw LuaError(std::string("Invalid ") + (name) + \
 				" (expected " + lua_typename(L, (type)) + \
-				" got " + lua_typename(L, t) + ")."); \
+				" got " + lua_typename(L, t) + ").\n" + traceback); \
 		} \
 	} while(0)
 #define CHECK_POS_COORD(name) CHECK_TYPE(-1, "position coordinate '" name "'", LUA_TNUMBER)
diff --git a/src/script/cpp_api/s_env.cpp b/src/script/cpp_api/s_env.cpp
index 913d8539d..b1404bf22 100644
--- a/src/script/cpp_api/s_env.cpp
+++ b/src/script/cpp_api/s_env.cpp
@@ -54,7 +54,9 @@ void ScriptApiEnv::environment_Step(float dtime)
 	try {
 		runCallbacks(1, RUN_CALLBACKS_MODE_FIRST);
 	} catch (LuaError &e) {
-		getServer()->setAsyncFatalError(e.what());
+		getServer()->setAsyncFatalError(
+				std::string("environment_Step: ") + e.what() + "\n"
+				+ script_get_backtrace(L));
 	}
 }
 
@@ -75,7 +77,9 @@ void ScriptApiEnv::player_event(ServerActiveObject *player, const std::string &t
 	try {
 		runCallbacks(2, RUN_CALLBACKS_MODE_FIRST);
 	} catch (LuaError &e) {
-		getServer()->setAsyncFatalError(e.what());
+		getServer()->setAsyncFatalError(
+				std::string("player_event: ") + e.what() + "\n"
+				+ script_get_backtrace(L) );
 	}
 }
 
@@ -237,7 +241,9 @@ void ScriptApiEnv::on_emerge_area_completion(
 	try {
 		PCALL_RES(lua_pcall(L, 4, 0, error_handler));
 	} catch (LuaError &e) {
-		server->setAsyncFatalError(e.what());
+		server->setAsyncFatalError(
+				std::string("on_emerge_area_completion: ") + e.what() + "\n"
+				+ script_get_backtrace(L));
 	}
 
 	lua_pop(L, 1); // Pop error handler
diff --git a/src/server.cpp b/src/server.cpp
index 7380d37c2..29dce5a4a 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -107,7 +107,8 @@ void *ServerThread::run()
 		} catch (con::ConnectionBindFailed &e) {
 			m_server->setAsyncFatalError(e.what());
 		} catch (LuaError &e) {
-			m_server->setAsyncFatalError("Lua: " + std::string(e.what()));
+			m_server->setAsyncFatalError(
+					"ServerThread::run Lua: " + std::string(e.what()));
 		}
 	}
 
@@ -487,7 +488,7 @@ void Server::step(float dtime)
 				g_settings->get("kick_msg_crash"),
 				g_settings->getBool("ask_reconnect_on_crash"));
 		}
-		throw ServerError(async_err);
+		throw ServerError("AsyncErr: " + async_err);
 	}
 }
 
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