/**
* collectd - src/lua.c
* Copyright (C) 2010 Julien Ammous
+ * Copyright (C) 2010 Florian Forster
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
*
* Authors:
* Julien Ammous
+ * Florian Forster <octo at collectd.org>
**/
+/* <lua5.1/luaconf.h> defines a macro using "sprintf". Although not used here,
+ * GCC will complain about the macro definition. */
+#define DONT_POISON_SPRINTF_YET
+
#include "collectd.h"
#include "plugin.h"
#include "common.h"
#include <lauxlib.h>
#include <lualib.h>
+#if defined(COLLECT_DEBUG) && COLLECT_DEBUG && defined(__GNUC__) && __GNUC__
+# undef sprintf
+# pragma GCC poison sprintf
+#endif
+
typedef struct lua_script_s {
char *script_path;
lua_State *lua_state;
struct lua_script_s *next;
} lua_script_t;
+struct clua_read_function_s
+{
+ lua_State *lua_state;
+ char *lua_function_name;
+};
+typedef struct clua_read_function_s clua_read_function_t;
+
struct lua_c_functions_s
{
char *name;
static char base_path[PATH_MAX + 1] = "";
static lua_script_t *scripts = NULL;
+static int clua_read (user_data_t *ud) /* {{{ */
+{
+ clua_read_function_t *rf = ud->data;
+ int status;
+
+ /* Load the function to the stack */
+ lua_pushstring (rf->lua_state, rf->lua_function_name);
+ lua_gettable (rf->lua_state, LUA_REGISTRYINDEX);
+
+ if (!lua_isfunction (rf->lua_state, /* stack pos = */ -1))
+ {
+ ERROR ("lua plugin: Unable to lookup the read function \"%s\".",
+ rf->lua_function_name);
+ /* pop the value again */
+ lua_settop (rf->lua_state, -2);
+ return (-1);
+ }
+
+ lua_call (rf->lua_state, /* nargs = */ 0, /* nresults = */ 1);
+
+ if (lua_isnumber (rf->lua_state, -1))
+ {
+ status = (int) lua_tonumber (rf->lua_state, -1);
+ }
+ else
+ {
+ ERROR ("lua plugin: Read function \"%s\" did not return a numeric status.",
+ rf->lua_function_name);
+ status = -1;
+ }
+ /* pop the value */
+ lua_settop (rf->lua_state, -2);
+
+ return (status);
+} /* }}} int clua_read */
+
/* Cleans up the stack, pushes the return value as a number onto the stack and
* returns the number of values returned (1). */
#define RETURN_LUA(l,status) do { \
return (1); \
} while (0)
+static int ltoc_value (lua_State *l, /* {{{ */
+ int ds_type, value_t *ret_value)
+{
+ if (!lua_isnumber (l, /* stack pos = */ -1))
+ return (-1);
+
+ if (ds_type == DS_TYPE_GAUGE)
+ ret_value->gauge = (gauge_t) lua_tonumber (l, /* stack pos = */ -1);
+ else if (ds_type == DS_TYPE_DERIVE)
+ ret_value->derive = (derive_t) lua_tointeger (l, /* stack pos = */ -1);
+ else if (ds_type == DS_TYPE_COUNTER)
+ ret_value->counter = (counter_t) lua_tointeger (l, /* stack pos = */ -1);
+ else if (ds_type == DS_TYPE_ABSOLUTE)
+ ret_value->absolute = (absolute_t) lua_tointeger (l, /* stack pos = */ -1);
+ else
+ assert (23 == 42);
+
+ return (0);
+} /* }}} int ltoc_value */
+
+static int ltoc_values (lua_State *l, /* {{{ */
+ const data_set_t *ds,
+ value_t *ret_values)
+{
+ size_t i;
+ int status = 0;
+
+ if (!lua_istable (l, -1))
+ {
+ lua_pop (l, /* nelem = */ 1);
+ return (-1);
+ }
+
+ /* Push initial key */
+ lua_pushnil (l);
+ for (i = 0; i < ((size_t) ds->ds_num); i++)
+ {
+ /* Pops old key and pushed new key and value. */
+ status = lua_next (l, -2);
+ if (status == 0) /* no more elements */
+ break;
+
+ status = ltoc_value (l, ds->ds[i].type, ret_values + i);
+ if (status != 0)
+ {
+ DEBUG ("ltoc_value failed.");
+ break;
+ }
+
+ /* Pop the value */
+ lua_pop (l, /* nelems = */ 1);
+ }
+ /* Pop the key and the table itself */
+ lua_pop (l, /* nelems = */ 2);
+
+ return (status);
+} /* }}} int ltoc_values */
+
+static int ltoc_table_values (lua_State *l, /* {{{ */
+ const data_set_t *ds, value_list_t *vl)
+{
+ int status;
+
+ lua_pushstring (l, "values");
+ lua_gettable (l, -2);
+
+ if (!lua_istable (l, -1))
+ {
+ NOTICE ("lua plugin: ltoc_table_values: The \"values\" member is not a table.");
+ lua_pop (l, /* nelem = */ 1);
+ return (-1);
+ }
+
+ vl->values_len = ds->ds_num;
+ vl->values = calloc ((size_t) vl->values_len, sizeof (*vl->values));
+ if (vl->values == NULL)
+ {
+ ERROR ("lua plugin: calloc failed.");
+ vl->values_len = 0;
+ lua_pop (l, /* nelem = */ 1);
+ return (-1);
+ }
+
+ status = ltoc_values (l, ds, vl->values);
+
+ lua_pop (l, /* nelem = */ 1);
+
+ if (status != 0)
+ {
+ vl->values_len = 0;
+ sfree (vl->values);
+ }
+
+ return (status);
+} /* }}} int ltoc_table_values */
+
+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) /* {{{ */
+{
+ const data_set_t *ds;
+ 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
+
+ ds = plugin_get_ds (vl->type);
+ if (ds == NULL)
+ {
+ INFO ("lua plugin: Unable to lookup type \"%s\".", vl->type);
+ sfree (vl);
+ return (NULL);
+ }
+
+ 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;
+
+ status = ltoc_table_values (l, ds, vl);
+ if (status != 0)
+ {
+ WARNING ("lua plugin: ltoc_table_values failed.");
+ sfree (vl);
+ return (NULL);
+ }
+
+ return (vl);
+} /* }}} value_list_t *ltoc_value_list */
+
/*
* Exported functions
*/
RETURN_LUA (l, 0);
} /* }}} int lua_cb_log */
-static lua_c_functions_t lua_c_functions[] =
+static int lua_cb_dispatch_values (lua_State *l) /* {{{ */
{
- { "collectd_log", lua_cb_log }
-};
+ 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);
+ }
-/* 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[] =
+ 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->values);
+ sfree (vl);
+ RETURN_LUA (l, 0);
+} /* }}} lua_cb_dispatch_values */
+
+static int lua_cb_register_read (lua_State *l) /* {{{ */
{
- { 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 int count = 0;
+ int nargs = lua_gettop (l); /* number of arguments */
+ clua_read_function_t *rf;
+
+ int num = count++; /* XXX FIXME: Not thread-safe! */
+ char function_name[64];
+
+ if (nargs != 1)
+ {
+ WARNING ("lua plugin: collectd_register_read() called with an invalid "
+ "number of arguments (%i).", nargs);
+ RETURN_LUA (l, -1);
+ }
+
+ /* If the argument is a string, assume it's a global function and try to look
+ * it up. */
+ if (lua_isstring (l, /* stack pos = */ 1))
+ lua_gettable (l, LUA_GLOBALSINDEX);
+
+ if (!lua_isfunction (l, /* stack pos = */ 1))
+ {
+ WARNING ("lua plugin: The first argument of collectd_register_read() "
+ "must be a function.");
+ RETURN_LUA (l, -1);
+ }
+
+ ssnprintf (function_name, sizeof (function_name), "collectd.read_func_%i", num);
+
+ /* Push the name of the global variable */
+ lua_pushstring (l, function_name);
+ /* Push the name down to the first position */
+ lua_insert (l, 1);
+ /* Now set the global variable called "collectd". */
+ lua_settable (l, LUA_REGISTRYINDEX);
+
+ rf = malloc (sizeof (*rf));
+ if (rf == NULL)
+ {
+ ERROR ("lua plugin: malloc failed.");
+ RETURN_LUA (l, -1);
+ }
+ else
+ {
+ user_data_t ud = { rf, /* free func */ NULL /* FIXME */ };
+ char cb_name[DATA_MAX_NAME_LEN];
+
+ memset (rf, 0, sizeof (*rf));
+ rf->lua_state = l;
+ rf->lua_function_name = strdup (function_name);
+
+ ssnprintf (cb_name, sizeof (cb_name), "lua/read_func_%i", num);
+
+ plugin_register_complex_read (/* group = */ "lua",
+ /* name = */ cb_name,
+ /* callback = */ clua_read,
+ /* interval = */ NULL,
+ /* user_data = */ &ud);
+ }
+
+ DEBUG ("lua plugin: Successful call to lua_cb_register_read().");
+
+ RETURN_LUA (l, 0);
+} /* }}} int lua_cb_register_read */
+
+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 }
};
static void lua_script_free (lua_script_t *script) /* {{{ */
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 = lua_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);
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