return (1); \
} while (0)
+static int ltoc_string_buffer (lua_State *l, /* {{{ */
+ char *buffer, size_t buffer_size,
+ _Bool consume)
+{
+ const char *str;
+
+ str = lua_tostring (l, /* stack pos = */ -1);
+ if (str != NULL)
+ sstrncpy (buffer, str, buffer_size);
+
+ if (consume)
+ lua_pop (l, /* nelem = */ 1);
+
+ return ((str != NULL) ? 0 : -1);
+} /* }}} int ltoc_string_buffer */
+
+static int ltoc_table_string_buffer (lua_State *l, /* {{{ */
+ const char *table_key,
+ char *buffer, size_t buffer_size)
+{
+ lua_pushstring (l, table_key);
+ lua_gettable (l, -2);
+
+ if (!lua_isstring (l, /* stack pos = */ -1))
+ {
+ lua_pop (l, /* nelem = */ 1);
+ return (-1);
+ }
+
+ return (ltoc_string_buffer (l, buffer, buffer_size, /* consume = */ 1));
+} /* }}} int ltoc_table_string_buffer */
+
+static int ltoc_table_cdtime (lua_State *l, /* {{{ */
+ const char *table_key, cdtime_t *ret_time)
+{
+ double d;
+
+ lua_pushstring (l, table_key);
+ lua_gettable (l, -2);
+
+ if (!lua_isnumber (l, /* stack pos = */ -1))
+ {
+ lua_pop (l, /* nelem = */ 1);
+ return (-1);
+ }
+
+ d = (double) lua_tonumber (l, -1);
+ lua_pop (l, /* nelem = */ 1);
+
+ *ret_time = DOUBLE_TO_CDTIME_T (d);
+ return (0);
+} /* }}} int ltoc_table_cdtime */
+
+static value_list_t *ltoc_value_list (lua_State *l) /* {{{ */
+{
+ value_list_t *vl;
+ int status;
+
+ vl = malloc (sizeof (*vl));
+ if (vl == NULL)
+ return (NULL);
+ memset (vl, 0, sizeof (*vl));
+ vl->values = NULL;
+ vl->meta = NULL;
+
+#define COPY_FIELD(field,def) do { \
+ status = ltoc_table_string_buffer (l, #field, vl->field, sizeof (vl->field)); \
+ if (status != 0) { \
+ if ((def) == NULL) \
+ return (NULL); \
+ else \
+ sstrncpy (vl->field, (def), sizeof (vl->field)); \
+ } \
+} while (0)
+
+ COPY_FIELD (host, hostname_g);
+ COPY_FIELD (plugin, NULL);
+ COPY_FIELD (plugin_instance, "");
+ COPY_FIELD (type, NULL);
+ COPY_FIELD (type_instance, "");
+
+#undef COPY_FIELD
+
+ status = ltoc_table_cdtime (l, "time", &vl->time);
+ if (status != 0)
+ vl->time = cdtime ();
+
+ status = ltoc_table_cdtime (l, "interval", &vl->interval);
+ if (status != 0)
+ vl->interval = interval_g;
+
+ /* TODO: values */
+
+ return (vl);
+} /* }}} value_list_t *ltoc_value_list */
+
/*
* Exported functions
*/
RETURN_LUA (l, 0);
} /* }}} int lua_cb_log */
+static int lua_cb_dispatch_values (lua_State *l) /* {{{ */
+{
+ value_list_t *vl;
+ int nargs = lua_gettop (l); /* number of arguments */
+ char identifier[6 * DATA_MAX_NAME_LEN];
+
+ if (nargs != 1)
+ {
+ WARNING ("lua plugin: collectd_dispatch_values() called "
+ "with an invalid number of arguments (%i).", nargs);
+ RETURN_LUA (l, -1);
+ }
+
+ if (!lua_istable (l, 1))
+ {
+ WARNING ("lua plugin: The first argument to collectd_dispatch_values() "
+ "must be a table.");
+ RETURN_LUA (l, -1);
+ }
+
+ vl = ltoc_value_list (l);
+ if (vl == NULL)
+ {
+ WARNING ("lua plugin: ltoc_value_list failed.");
+ RETURN_LUA (l, -1);
+ }
+
+ FORMAT_VL (identifier, sizeof (identifier), vl);
+
+ DEBUG ("lua plugin: collectd_dispatch_values: Received value list \"%s\", time %.3f, interval %.3f.",
+ identifier, CDTIME_T_TO_DOUBLE (vl->time), CDTIME_T_TO_DOUBLE (vl->interval));
+
+ sfree (vl);
+ RETURN_LUA (l, 0);
+} /* }}} lua_cb_dispatch_values */
+
static int lua_cb_register_read (lua_State *l) /* {{{ */
{
static int count = 0;
static lua_c_functions_t lua_c_functions[] =
{
{ "collectd_log", lua_cb_log },
+ { "collectd_dispatch_values", lua_cb_dispatch_values },
{ "collectd_register_read", lua_cb_register_read }
};
-/* Declare the Lua libraries we wish to use.
- * Note: If you are opening and running a file containing Lua code using
- * 'lua_dofile(l, "myfile.lua") - you must delcare all the libraries used in
- * that file here also. */
-static const luaL_reg lua_load_libs[] =
-{
- { LUA_COLIBNAME, luaopen_base },
- /* { "luaopen_loadlib", luaopen_loadlib }, */
-#if COLLECT_DEBUG
- { LUA_DBLIBNAME, luaopen_debug },
-#endif
- { LUA_TABLIBNAME, luaopen_table },
- { LUA_IOLIBNAME, luaopen_io },
- { LUA_STRLIBNAME, luaopen_string },
- { LUA_MATHLIBNAME, luaopen_math }
-};
-
static void lua_script_free (lua_script_t *script) /* {{{ */
{
lua_script_t *next;
return (-1);
}
- /* Open up all the Lua libraries declared above. */
- for (i = 0; i < STATIC_ARRAY_SIZE (lua_load_libs); i++)
- {
- int status;
-
- status = (*lua_load_libs[i].func) (script->lua_state);
- if (status != 0)
- WARNING ("lua plugin: Loading library \"%s\" failed.",
- lua_load_libs[i].name);
- }
+ /* Open up all the standard Lua libraries. */
+ luaL_openlibs (script->lua_state);
/* Register all the functions we implement in C */
for (i = 0; i < STATIC_ARRAY_SIZE (lua_c_functions); i++)
return (-1);
}
- status = luaL_dofile (script->lua_state, script->script_path);
+ status = luaL_loadfile (script->lua_state, script->script_path);
+ if (status != 0)
+ {
+ ERROR ("lua plugin: luaL_loadfile failed with status %i", status);
+ lua_script_free (script);
+ return (-1);
+ }
+
+ status = lua_pcall (script->lua_state,
+ /* nargs = */ 0,
+ /* nresults = */ LUA_MULTRET,
+ /* errfunc = */ 0);
if (status != 0)
{
const char *errmsg;
- switch (status)
- {
- case LUA_ERRSYNTAX: errmsg = "Syntax error"; break;
- case LUA_ERRFILE: errmsg = "File I/O error"; break;
- case LUA_ERRMEM: errmsg = "Memory allocation error"; break;
- default: errmsg = "Unexpected error";
- }
+ errmsg = lua_tostring (script->lua_state, /* stack pos = */ -1);
- ERROR ("lua plugin: Loading script \"%s\" failed: %s",
- script->script_path, errmsg);
+ if (errmsg == NULL)
+ ERROR ("lua plugin: lua_pcall failed with status %i. "
+ "In addition, no error message could be retrieved from the stack.",
+ status);
+ else
+ ERROR ("lua plugin: Executing script \"%s\" failed:\n%s",
+ script->script_path, errmsg);
lua_script_free (script);
return (-1);
projects / collectd.git / blobdiff