3 * Copyright (C) 2010 Julien Ammous
4 * Copyright (C) 2010 Florian Forster
5 * Copyright (C) 2016 Ruben Kerkhof
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27 * Florian Forster <octo at collectd.org>
28 * Ruben Kerkhof <ruben at rubenkerkhof.com>
33 #include "utils/common/common.h"
34 #include "utils_lua.h"
36 /* Include the Lua API header files. */
43 typedef struct lua_script_s {
45 struct lua_script_s *next;
50 char *lua_function_name;
53 } clua_callback_data_t;
55 static char base_path[PATH_MAX];
56 static lua_script_t *scripts;
58 static int clua_store_callback(lua_State *L, int idx) /* {{{ */
60 /* Copy the function pointer */
61 lua_pushvalue(L, idx);
63 return luaL_ref(L, LUA_REGISTRYINDEX);
64 } /* }}} int clua_store_callback */
66 static int clua_load_callback(lua_State *L, int callback_ref) /* {{{ */
68 lua_rawgeti(L, LUA_REGISTRYINDEX, callback_ref);
70 if (!lua_isfunction(L, -1)) {
76 } /* }}} int clua_load_callback */
78 /* Store the threads in a global variable so they are not cleaned up by the
79 * garbage collector. */
80 static int clua_store_thread(lua_State *L, int idx) /* {{{ */
83 idx += lua_gettop(L) + 1;
85 /* Copy the thread pointer */
86 lua_pushvalue(L, idx); /* +1 = 3 */
87 if (!lua_isthread(L, -1)) {
88 lua_pop(L, 3); /* -3 = 0 */
92 luaL_ref(L, LUA_REGISTRYINDEX);
93 lua_pop(L, 1); /* -1 = 0 */
95 } /* }}} int clua_store_thread */
97 static int clua_read(user_data_t *ud) /* {{{ */
99 clua_callback_data_t *cb = ud->data;
101 pthread_mutex_lock(&cb->lock);
103 lua_State *L = cb->lua_state;
105 int status = clua_load_callback(L, cb->callback_id);
107 ERROR("Lua plugin: Unable to load callback \"%s\" (id %i).",
108 cb->lua_function_name, cb->callback_id);
109 pthread_mutex_unlock(&cb->lock);
114 status = lua_pcall(L, 0, 1, 0);
116 const char *errmsg = lua_tostring(L, -1);
118 ERROR("Lua plugin: Calling a read callback failed. "
119 "In addition, retrieving the error message failed.");
121 ERROR("Lua plugin: Calling a read callback failed: %s", errmsg);
123 pthread_mutex_unlock(&cb->lock);
127 if (!lua_isnumber(L, -1)) {
128 ERROR("Lua plugin: Read function \"%s\" (id %i) did not return a numeric "
130 cb->lua_function_name, cb->callback_id);
133 status = (int)lua_tointeger(L, -1);
136 /* pop return value and function */
137 lua_pop(L, 1); /* -1 = 0 */
139 pthread_mutex_unlock(&cb->lock);
141 } /* }}} int clua_read */
143 static int clua_write(const data_set_t *ds, const value_list_t *vl, /* {{{ */
145 clua_callback_data_t *cb = ud->data;
147 pthread_mutex_lock(&cb->lock);
149 lua_State *L = cb->lua_state;
151 int status = clua_load_callback(L, cb->callback_id);
153 ERROR("Lua plugin: Unable to load callback \"%s\" (id %i).",
154 cb->lua_function_name, cb->callback_id);
155 pthread_mutex_unlock(&cb->lock);
160 status = luaC_pushvaluelist(L, ds, vl);
162 lua_pop(L, 1); /* -1 = 0 */
163 pthread_mutex_unlock(&cb->lock);
164 ERROR("Lua plugin: luaC_pushvaluelist failed.");
169 status = lua_pcall(L, 1, 1, 0); /* -2+1 = 1 */
171 const char *errmsg = lua_tostring(L, -1);
173 ERROR("Lua plugin: Calling the write callback failed. "
174 "In addition, retrieving the error message failed.");
176 ERROR("Lua plugin: Calling the write callback failed:\n%s", errmsg);
177 lua_pop(L, 1); /* -1 = 0 */
178 pthread_mutex_unlock(&cb->lock);
182 if (!lua_isnumber(L, -1)) {
183 ERROR("Lua plugin: Write function \"%s\" (id %i) did not return a numeric "
185 cb->lua_function_name, cb->callback_id);
188 status = (int)lua_tointeger(L, -1);
191 lua_pop(L, 1); /* -1 = 0 */
192 pthread_mutex_unlock(&cb->lock);
194 } /* }}} int clua_write */
200 static int lua_cb_log_debug(lua_State *L) /* {{{ */
202 const char *msg = luaL_checkstring(L, 1);
203 plugin_log(LOG_DEBUG, "%s", msg);
205 } /* }}} int lua_cb_log_debug */
207 static int lua_cb_log_error(lua_State *L) /* {{{ */
209 const char *msg = luaL_checkstring(L, 1);
210 plugin_log(LOG_ERR, "%s", msg);
212 } /* }}} int lua_cb_log_error */
214 static int lua_cb_log_info(lua_State *L) /* {{{ */
216 const char *msg = luaL_checkstring(L, 1);
217 plugin_log(LOG_INFO, "%s", msg);
219 } /* }}} int lua_cb_log_info */
221 static int lua_cb_log_notice(lua_State *L) /* {{{ */
223 const char *msg = luaL_checkstring(L, 1);
224 plugin_log(LOG_NOTICE, "%s", msg);
226 } /* }}} int lua_cb_log_notice */
228 static int lua_cb_log_warning(lua_State *L) /* {{{ */
230 const char *msg = luaL_checkstring(L, 1);
231 plugin_log(LOG_WARNING, "%s", msg);
233 } /* }}} int lua_cb_log_warning */
235 static int lua_cb_dispatch_values(lua_State *L) /* {{{ */
237 int nargs = lua_gettop(L);
240 return luaL_error(L, "Invalid number of arguments (%d != 1)", nargs);
242 luaL_checktype(L, 1, LUA_TTABLE);
244 value_list_t *vl = luaC_tovaluelist(L, -1);
246 return luaL_error(L, "%s", "luaC_tovaluelist failed");
249 char identifier[6 * DATA_MAX_NAME_LEN];
250 FORMAT_VL(identifier, sizeof(identifier), vl);
252 DEBUG("Lua plugin: collectd.dispatch_values(): Received value list \"%s\", "
253 "time %.3f, interval %.3f.",
254 identifier, CDTIME_T_TO_DOUBLE(vl->time),
255 CDTIME_T_TO_DOUBLE(vl->interval));
258 plugin_dispatch_values(vl);
263 } /* }}} lua_cb_dispatch_values */
265 static void lua_cb_free(void *data) {
266 clua_callback_data_t *cb = data;
267 free(cb->lua_function_name);
271 static int lua_cb_register_read(lua_State *L) /* {{{ */
273 int nargs = lua_gettop(L);
276 return luaL_error(L, "Invalid number of arguments (%d != 1)", nargs);
278 luaL_checktype(L, 1, LUA_TFUNCTION);
280 char function_name[DATA_MAX_NAME_LEN];
281 snprintf(function_name, sizeof(function_name), "lua/%s", lua_tostring(L, 1));
283 int callback_id = clua_store_callback(L, 1);
285 return luaL_error(L, "%s", "Storing callback function failed");
287 lua_State *thread = lua_newthread(L);
289 return luaL_error(L, "%s", "lua_newthread failed");
290 clua_store_thread(L, -1);
293 clua_callback_data_t *cb = calloc(1, sizeof(*cb));
295 return luaL_error(L, "%s", "calloc failed");
297 cb->lua_state = thread;
298 cb->callback_id = callback_id;
299 cb->lua_function_name = strdup(function_name);
300 pthread_mutex_init(&cb->lock, NULL);
303 plugin_register_complex_read(/* group = */ "lua",
304 /* name = */ function_name,
305 /* callback = */ clua_read,
308 .data = cb, .free_func = lua_cb_free,
312 return luaL_error(L, "%s", "plugin_register_complex_read failed");
314 } /* }}} int lua_cb_register_read */
316 static int lua_cb_register_write(lua_State *L) /* {{{ */
318 int nargs = lua_gettop(L);
321 return luaL_error(L, "Invalid number of arguments (%d != 1)", nargs);
323 luaL_checktype(L, 1, LUA_TFUNCTION);
325 char function_name[DATA_MAX_NAME_LEN] = "";
326 snprintf(function_name, sizeof(function_name), "lua/%s", lua_tostring(L, 1));
328 int callback_id = clua_store_callback(L, 1);
330 return luaL_error(L, "%s", "Storing callback function failed");
332 lua_State *thread = lua_newthread(L);
334 return luaL_error(L, "%s", "lua_newthread failed");
335 clua_store_thread(L, -1);
338 clua_callback_data_t *cb = calloc(1, sizeof(*cb));
340 return luaL_error(L, "%s", "calloc failed");
342 cb->lua_state = thread;
343 cb->callback_id = callback_id;
344 cb->lua_function_name = strdup(function_name);
345 pthread_mutex_init(&cb->lock, NULL);
347 int status = plugin_register_write(/* name = */ function_name,
348 /* callback = */ clua_write,
350 .data = cb, .free_func = lua_cb_free,
354 return luaL_error(L, "%s", "plugin_register_write failed");
356 } /* }}} int lua_cb_register_write */
358 static const luaL_Reg collectdlib[] = {
359 {"log_debug", lua_cb_log_debug},
360 {"log_error", lua_cb_log_error},
361 {"log_info", lua_cb_log_info},
362 {"log_notice", lua_cb_log_notice},
363 {"log_warning", lua_cb_log_warning},
364 {"dispatch_values", lua_cb_dispatch_values},
365 {"register_read", lua_cb_register_read},
366 {"register_write", lua_cb_register_write},
369 static int open_collectd(lua_State *L) /* {{{ */
371 #if LUA_VERSION_NUM < 502
372 luaL_register(L, "collectd", collectdlib);
374 luaL_newlib(L, collectdlib);
379 static void lua_script_free(lua_script_t *script) /* {{{ */
384 lua_script_t *next = script->next;
386 if (script->lua_state != NULL) {
387 lua_close(script->lua_state);
388 script->lua_state = NULL;
393 lua_script_free(next);
394 } /* }}} void lua_script_free */
396 static int lua_script_init(lua_script_t *script) /* {{{ */
398 memset(script, 0, sizeof(*script));
400 /* initialize the lua context */
401 script->lua_state = luaL_newstate();
402 if (script->lua_state == NULL) {
403 ERROR("Lua plugin: luaL_newstate() failed.");
407 /* Open up all the standard Lua libraries. */
408 luaL_openlibs(script->lua_state);
410 /* Load the 'collectd' library */
411 #if LUA_VERSION_NUM < 502
412 lua_pushcfunction(script->lua_state, open_collectd);
413 lua_pushstring(script->lua_state, "collectd");
414 lua_call(script->lua_state, 1, 0);
416 luaL_requiref(script->lua_state, "collectd", open_collectd, 1);
417 lua_pop(script->lua_state, 1);
420 /* Prepend BasePath to package.path */
421 if (base_path[0] != '\0') {
422 lua_getglobal(script->lua_state, "package");
423 lua_getfield(script->lua_state, -1, "path");
425 const char *cur_path = lua_tostring(script->lua_state, -1);
426 char *new_path = ssnprintf_alloc("%s/?.lua;%s", base_path, cur_path);
428 lua_pop(script->lua_state, 1);
429 lua_pushstring(script->lua_state, new_path);
433 lua_setfield(script->lua_state, -2, "path");
434 lua_pop(script->lua_state, 1);
438 } /* }}} int lua_script_init */
440 static int lua_script_load(const char *script_path) /* {{{ */
442 lua_script_t *script = malloc(sizeof(*script));
443 if (script == NULL) {
444 ERROR("Lua plugin: malloc failed.");
448 int status = lua_script_init(script);
450 lua_script_free(script);
454 status = luaL_loadfile(script->lua_state, script_path);
456 ERROR("Lua plugin: luaL_loadfile failed: %s",
457 lua_tostring(script->lua_state, -1));
458 lua_pop(script->lua_state, 1);
459 lua_script_free(script);
463 status = lua_pcall(script->lua_state,
465 /* nresults = */ LUA_MULTRET,
468 const char *errmsg = lua_tostring(script->lua_state, -1);
471 ERROR("Lua plugin: lua_pcall failed with status %i. "
472 "In addition, no error message could be retrieved from the stack.",
475 ERROR("Lua plugin: Executing script \"%s\" failed:\n%s",
476 script_path, errmsg);
478 lua_script_free(script);
482 /* Append this script to the global list of scripts. */
484 lua_script_t *last = scripts;
494 } /* }}} int lua_script_load */
496 static int lua_config_base_path(const oconfig_item_t *ci) /* {{{ */
498 int status = cf_util_get_string_buffer(ci, base_path, sizeof(base_path));
502 size_t len = strlen(base_path);
503 while ((len > 0) && (base_path[len - 1] == '/')) {
505 base_path[len] = '\0';
508 DEBUG("Lua plugin: base_path = \"%s\";", base_path);
511 } /* }}} int lua_config_base_path */
513 static int lua_config_script(const oconfig_item_t *ci) /* {{{ */
515 char rel_path[PATH_MAX];
517 int status = cf_util_get_string_buffer(ci, rel_path, sizeof(rel_path));
521 char abs_path[PATH_MAX];
523 if (base_path[0] == '\0')
524 sstrncpy(abs_path, rel_path, sizeof(abs_path));
526 snprintf(abs_path, sizeof(abs_path), "%s/%s", base_path, rel_path);
528 DEBUG("Lua plugin: abs_path = \"%s\";", abs_path);
530 status = lua_script_load(abs_path);
534 INFO("Lua plugin: File \"%s\" loaded successfully", abs_path);
537 } /* }}} int lua_config_script */
542 * Script "script1.lua"
543 * Script "script2.lua"
546 static int lua_config(oconfig_item_t *ci) /* {{{ */
549 for (int i = 0; i < ci->children_num; i++) {
550 oconfig_item_t *child = ci->children + i;
552 if (strcasecmp("BasePath", child->key) == 0) {
553 status = lua_config_base_path(child);
554 } else if (strcasecmp("Script", child->key) == 0) {
555 status = lua_config_script(child);
557 ERROR("Lua plugin: Option `%s' is not allowed here.", child->key);
563 } /* }}} int lua_config */
565 static int lua_shutdown(void) /* {{{ */
567 lua_script_free(scripts);
570 } /* }}} int lua_shutdown */
572 void module_register(void) {
573 plugin_register_complex_config("lua", lua_config);
574 plugin_register_shutdown("lua", lua_shutdown);