3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include "cpp_api/s_base.h"
21 #include "cpp_api/s_internal.h"
22 #include "cpp_api/s_security.h"
23 #include "lua_api/l_object.h"
24 #include "common/c_converter.h"
25 #include "serverobject.h"
29 #include "util/string.h"
53 ModNameStorer(lua_State *L_, const std::string &mod_name):
56 // Store current mod name in registry
57 lua_pushstring(L, mod_name.c_str());
58 lua_rawseti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_CURRENT_MOD_NAME);
62 // Clear current mod name from registry
64 lua_rawseti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_CURRENT_MOD_NAME);
73 ScriptApiBase::ScriptApiBase() :
77 #ifdef SCRIPTAPI_LOCK_DEBUG
78 m_lock_recursion_count = 0;
81 m_luastack = luaL_newstate();
82 FATAL_ERROR_IF(!m_luastack, "luaL_newstate() failed");
84 lua_atpanic(m_luastack, &luaPanic);
86 luaL_openlibs(m_luastack);
88 // Make the ScriptApiBase* accessible to ModApiBase
89 lua_pushlightuserdata(m_luastack, this);
90 lua_rawseti(m_luastack, LUA_REGISTRYINDEX, CUSTOM_RIDX_SCRIPTAPI);
92 // Add and save an error handler
93 lua_pushcfunction(m_luastack, script_error_handler);
94 lua_rawseti(m_luastack, LUA_REGISTRYINDEX, CUSTOM_RIDX_ERROR_HANDLER);
96 // If we are using LuaJIT add a C++ wrapper function to catch
97 // exceptions thrown in Lua -> C++ calls
99 lua_pushlightuserdata(m_luastack, (void*) script_exception_wrapper);
100 luaJIT_setmode(m_luastack, -1, LUAJIT_MODE_WRAPCFUNC | LUAJIT_MODE_ON);
101 lua_pop(m_luastack, 1);
105 lua_newtable(m_luastack);
106 lua_setglobal(m_luastack, "core");
108 lua_pushstring(m_luastack, DIR_DELIM);
109 lua_setglobal(m_luastack, "DIR_DELIM");
111 lua_pushstring(m_luastack, porting::getPlatformName());
112 lua_setglobal(m_luastack, "PLATFORM");
114 // m_secure gets set to true inside
115 // ScriptApiSecurity::initializeSecurity(), if neccessary.
116 // Default to false otherwise
119 m_environment = NULL;
123 ScriptApiBase::~ScriptApiBase()
125 lua_close(m_luastack);
128 int ScriptApiBase::luaPanic(lua_State *L)
130 std::ostringstream oss;
131 oss << "LUA PANIC: unprotected error in call to Lua API ("
132 << lua_tostring(L, -1) << ")";
133 FATAL_ERROR(oss.str().c_str());
138 void ScriptApiBase::loadMod(const std::string &script_path,
139 const std::string &mod_name)
141 ModNameStorer mod_name_storer(getStack(), mod_name);
143 loadScript(script_path);
146 void ScriptApiBase::loadScript(const std::string &script_path)
148 verbosestream << "Loading and running script from " << script_path << std::endl;
150 lua_State *L = getStack();
152 int error_handler = PUSH_ERROR_HANDLER(L);
156 ok = ScriptApiSecurity::safeLoadFile(L, script_path.c_str());
158 ok = !luaL_loadfile(L, script_path.c_str());
160 ok = ok && !lua_pcall(L, 0, 0, error_handler);
162 std::string error_msg = lua_tostring(L, -1);
163 lua_pop(L, 2); // Pop error message and error handler
164 throw ModError("Failed to load and run script from " +
165 script_path + ":\n" + error_msg);
167 lua_pop(L, 1); // Pop error handler
170 // Push the list of callbacks (a lua table).
171 // Then push nargs arguments.
172 // Then call this function, which
173 // - runs the callbacks
174 // - replaces the table and arguments with the return value,
175 // computed depending on mode
176 // This function must only be called with scriptlock held (i.e. inside of a
177 // code block with SCRIPTAPI_PRECHECKHEADER declared)
178 void ScriptApiBase::runCallbacksRaw(int nargs,
179 RunCallbacksMode mode, const char *fxn)
181 #ifdef SCRIPTAPI_LOCK_DEBUG
182 assert(m_lock_recursion_count > 0);
184 lua_State *L = getStack();
185 FATAL_ERROR_IF(lua_gettop(L) < nargs + 1, "Not enough arguments");
187 // Insert error handler
188 PUSH_ERROR_HANDLER(L);
189 int error_handler = lua_gettop(L) - nargs - 1;
190 lua_insert(L, error_handler);
192 // Insert run_callbacks between error handler and table
193 lua_getglobal(L, "core");
194 lua_getfield(L, -1, "run_callbacks");
196 lua_insert(L, error_handler + 1);
198 // Insert mode after table
199 lua_pushnumber(L, (int)mode);
200 lua_insert(L, error_handler + 3);
202 // Stack now looks like this:
203 // ... <error handler> <run_callbacks> <table> <mode> <arg#1> <arg#2> ... <arg#n>
205 int result = lua_pcall(L, nargs + 2, 1, error_handler);
207 scriptError(result, fxn);
209 lua_remove(L, error_handler);
212 void ScriptApiBase::realityCheck()
214 int top = lua_gettop(m_luastack);
216 dstream << "Stack is over 30:" << std::endl;
218 std::string traceback = script_get_backtrace(m_luastack);
219 throw LuaError("Stack is over 30 (reality check)\n" + traceback);
223 void ScriptApiBase::scriptError(int result, const char *fxn)
225 script_error(getStack(), result, m_last_run_mod.c_str(), fxn);
228 void ScriptApiBase::stackDump(std::ostream &o)
230 int top = lua_gettop(m_luastack);
231 for (int i = 1; i <= top; i++) { /* repeat for each level */
232 int t = lua_type(m_luastack, i);
234 case LUA_TSTRING: /* strings */
235 o << "\"" << lua_tostring(m_luastack, i) << "\"";
237 case LUA_TBOOLEAN: /* booleans */
238 o << (lua_toboolean(m_luastack, i) ? "true" : "false");
240 case LUA_TNUMBER: /* numbers */ {
242 snprintf(buf, 10, "%g", lua_tonumber(m_luastack, i));
246 default: /* other values */
247 o << lua_typename(m_luastack, t);
255 void ScriptApiBase::setOriginDirect(const char *origin)
257 m_last_run_mod = origin ? origin : "??";
260 void ScriptApiBase::setOriginFromTableRaw(int index, const char *fxn)
262 #ifdef SCRIPTAPI_DEBUG
263 lua_State *L = getStack();
265 m_last_run_mod = lua_istable(L, index) ?
266 getstringfield_default(L, index, "mod_origin", "") : "";
267 //printf(">>>> running %s for mod: %s\n", fxn, m_last_run_mod.c_str());
271 void ScriptApiBase::addObjectReference(ServerActiveObject *cobj)
273 SCRIPTAPI_PRECHECKHEADER
274 //infostream<<"scriptapi_add_object_reference: id="<<cobj->getId()<<std::endl;
276 // Create object on stack
277 ObjectRef::create(L, cobj); // Puts ObjectRef (as userdata) on stack
278 int object = lua_gettop(L);
280 // Get core.object_refs table
281 lua_getglobal(L, "core");
282 lua_getfield(L, -1, "object_refs");
283 luaL_checktype(L, -1, LUA_TTABLE);
284 int objectstable = lua_gettop(L);
286 // object_refs[id] = object
287 lua_pushnumber(L, cobj->getId()); // Push id
288 lua_pushvalue(L, object); // Copy object to top of stack
289 lua_settable(L, objectstable);
292 void ScriptApiBase::removeObjectReference(ServerActiveObject *cobj)
294 SCRIPTAPI_PRECHECKHEADER
295 //infostream<<"scriptapi_rm_object_reference: id="<<cobj->getId()<<std::endl;
297 // Get core.object_refs table
298 lua_getglobal(L, "core");
299 lua_getfield(L, -1, "object_refs");
300 luaL_checktype(L, -1, LUA_TTABLE);
301 int objectstable = lua_gettop(L);
303 // Get object_refs[id]
304 lua_pushnumber(L, cobj->getId()); // Push id
305 lua_gettable(L, objectstable);
306 // Set object reference to NULL
307 ObjectRef::set_null(L);
308 lua_pop(L, 1); // pop object
310 // Set object_refs[id] = nil
311 lua_pushnumber(L, cobj->getId()); // Push id
313 lua_settable(L, objectstable);
316 // Creates a new anonymous reference if cobj=NULL or id=0
317 void ScriptApiBase::objectrefGetOrCreate(lua_State *L,
318 ServerActiveObject *cobj)
320 if (cobj == NULL || cobj->getId() == 0) {
321 ObjectRef::create(L, cobj);
323 objectrefGet(L, cobj->getId());
327 void ScriptApiBase::objectrefGet(lua_State *L, u16 id)
329 // Get core.object_refs[i]
330 lua_getglobal(L, "core");
331 lua_getfield(L, -1, "object_refs");
332 luaL_checktype(L, -1, LUA_TTABLE);
333 lua_pushnumber(L, id);
335 lua_remove(L, -2); // object_refs
336 lua_remove(L, -2); // core
339 Server* ScriptApiBase::getServer()
341 return dynamic_cast<Server *>(m_gamedef);
344 Client* ScriptApiBase::getClient()
346 return dynamic_cast<Client *>(m_gamedef);