#include <lualib.h>
#include "utils_lua.h"
+#include <pthread.h>
+
#if defined(COLLECT_DEBUG) && COLLECT_DEBUG && defined(__GNUC__) && __GNUC__
# undef sprintf
# pragma GCC poison sprintf
#endif
-typedef struct lua_script_s {
+struct lua_script_s;
+typedef struct lua_script_s lua_script_t;
+struct lua_script_s
+{
char *script_path;
lua_State *lua_state;
- struct lua_script_s *next;
-} lua_script_t;
+ lua_script_t *next;
+};
-struct clua_read_function_s
+struct clua_callback_data_s
{
lua_State *lua_state;
char *lua_function_name;
+ pthread_mutex_t lock;
+ int callback_id;
};
-typedef struct clua_read_function_s clua_read_function_t;
+typedef struct clua_callback_data_s clua_callback_data_t;
struct lua_c_functions_s
{
static char base_path[PATH_MAX + 1] = "";
static lua_script_t *scripts = NULL;
+static int clua_store_callback (lua_State *l, int idx) /* {{{ */
+{
+ static int callback_num = 0;
+ int callback_id;
+
+ /* XXX FIXME: Not thread-safe! */
+ callback_id = ++callback_num;
+
+ if (idx < 0)
+ idx += lua_gettop (l) + 1;
+
+ lua_getfield (l, LUA_REGISTRYINDEX, "collectd_callbacks"); /* +1 = 1 */
+ if (!lua_istable (l, /* idx = */ -1))
+ {
+ lua_pop (l, /* nelems = */ 1); /* -1 = 0 */
+ lua_newtable (l); /* +1 = 1 */
+ lua_pushvalue (l, -1); /* +1 = 2 */
+ lua_setfield (l, LUA_REGISTRYINDEX, "collectd_callbacks"); /* -1 = 1 */
+ }
+
+ /* The table is now on top of the stack */
+ lua_pushinteger (l, (lua_Integer) callback_id); /* +1 = 2 */
+
+ /* Copy the function pointer */
+ lua_pushvalue (l, idx); /* +1 = 3 */
+ /* Lookup function if it's a string */
+ if (lua_isstring (l, /* idx = */ -1))
+ lua_gettable (l, LUA_GLOBALSINDEX); /* +-0 = 3 */
+
+ if (!lua_isfunction (l, /* idx = */ -1))
+ {
+ lua_pop (l, /* nelems = */ 3); /* -3 = 0 */
+ return (-1);
+ }
+
+ lua_settable (l, /* idx = */ -3); /* -2 = 1 */
+ lua_pop (l, /* nelems = */ 1); /* -1 = 0 */
+ return (callback_id);
+} /* }}} int clua_store_callback */
+
+static int clua_load_callback (lua_State *l, int callback_id) /* {{{ */
+{
+ lua_getfield (l, LUA_REGISTRYINDEX, "collectd_callbacks"); /* +1 */
+ if (!lua_istable (l, /* idx = */ -1))
+ {
+ lua_pop (l, /* nelems = */ 1); /* -1 */
+ return (-1);
+ }
+
+ lua_pushinteger (l, (lua_Integer) callback_id); /* + 1 */
+ lua_gettable (l, /* idx = */ -2); /* +-0 */
+
+ if (!lua_isfunction (l, -1))
+ {
+ lua_pop (l, /* nelems = */ 2); /* -2 */
+ return (-1);
+ }
+
+ /* Remove table */
+ lua_remove (l, /* idx = */ -2); /* -1 */
+ return (0);
+} /* }}} int clua_load_callback */
+
static int clua_read (user_data_t *ud) /* {{{ */
{
- clua_read_function_t *rf = ud->data;
+ clua_callback_data_t *cb = 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))
+ status = clua_load_callback (cb->lua_state, cb->callback_id);
+ if (status != 0)
{
- ERROR ("lua plugin: Unable to lookup the read function \"%s\".",
- rf->lua_function_name);
- /* pop the value again */
- lua_settop (rf->lua_state, -2);
+ ERROR ("lua plugin: Unable to load callback \"%s\" (id %i).",
+ cb->lua_function_name, cb->callback_id);
return (-1);
}
+ /* +1 = 1 */
- lua_call (rf->lua_state, /* nargs = */ 0, /* nresults = */ 1);
+ status = lua_pcall (cb->lua_state,
+ /* nargs = */ 0,
+ /* nresults = */ 1,
+ /* errfunc = */ 0); /* -1+1 = 1 */
+ if (status != 0)
+ {
+ const char *errmsg = lua_tostring (cb->lua_state, /* idx = */ -1);
+ if (errmsg == NULL)
+ ERROR ("lua plugin: Calling a read callback failed. "
+ "In addition, retrieving the error message failed.");
+ else
+ ERROR ("lua plugin: Calling a read callback failed: %s", errmsg);
+ lua_pop (cb->lua_state, /* nelems = */ 1); /* -1 = 0 */
+ return (-1);
+ }
- if (lua_isnumber (rf->lua_state, -1))
+ if (!lua_isnumber (cb->lua_state, /* idx = */ -1))
{
- status = (int) lua_tonumber (rf->lua_state, -1);
+ ERROR ("lua plugin: Read function \"%s\" (id %i) did not return a numeric status.",
+ cb->lua_function_name, cb->callback_id);
+ status = -1;
}
else
{
- ERROR ("lua plugin: Read function \"%s\" did not return a numeric status.",
- rf->lua_function_name);
- status = -1;
+ status = (int) lua_tointeger (cb->lua_state, /* idx = */ -1);
}
- /* pop the value */
- lua_settop (rf->lua_state, -2);
+
+ /* pop return value and function */
+ lua_pop (cb->lua_state, /* nelems = */ 1); /* -1 = 0 */
return (status);
} /* }}} int clua_read */
+static int clua_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
+ user_data_t *ud)
+{
+ clua_callback_data_t *cb = ud->data;
+ int status;
+
+ pthread_mutex_lock (&cb->lock);
+
+ status = clua_load_callback (cb->lua_state, cb->callback_id);
+ if (status != 0)
+ {
+ ERROR ("lua plugin: Unable to load callback \"%s\" (id %i).",
+ cb->lua_function_name, cb->callback_id);
+ pthread_mutex_unlock (&cb->lock);
+ return (-1);
+ }
+ /* +1 = 1 */
+
+ status = luaC_pushvaluelist (cb->lua_state, ds, vl);
+ if (status != 0)
+ {
+ lua_pop (cb->lua_state, /* nelems = */ 1); /* -1 = 0 */
+ pthread_mutex_unlock (&cb->lock);
+ ERROR ("lua plugin: luaC_pushvaluelist failed.");
+ return (-1);
+ }
+ /* +1 = 2 */
+
+ status = lua_pcall (cb->lua_state,
+ /* nargs = */ 1,
+ /* nresults = */ 1,
+ /* errfunc = */ 0); /* -2+1 = 1 */
+ if (status != 0)
+ {
+ const char *errmsg = lua_tostring (cb->lua_state, /* idx = */ -1);
+ if (errmsg == NULL)
+ ERROR ("lua plugin: Calling the write callback failed. "
+ "In addition, retrieving the error message failed.");
+ else
+ ERROR ("lua plugin: Calling the write callback failed:\n%s", errmsg);
+ lua_pop (cb->lua_state, /* nelems = */ 1); /* -1 = 0 */
+ pthread_mutex_unlock (&cb->lock);
+ return (-1);
+ }
+
+ if (!lua_isnumber (cb->lua_state, /* idx = */ -1))
+ {
+ ERROR ("lua plugin: Write function \"%s\" (id %i) did not return a numeric value.",
+ cb->lua_function_name, cb->callback_id);
+ status = -1;
+ }
+ else
+ {
+ status = (int) lua_tointeger (cb->lua_state, /* idx = */ -1);
+ }
+
+ lua_pop (cb->lua_state, /* nelems = */ 1); /* -1 = 0 */
+ pthread_mutex_unlock (&cb->lock);
+ return (status);
+} /* }}} int clua_write */
+
/* 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 { \
vl = luaC_tovaluelist (l, /* idx = */ -1);
if (vl == NULL)
{
- WARNING ("lua plugin: ltoc_value_list failed.");
+ WARNING ("lua plugin: luaC_tovaluelist failed.");
RETURN_LUA (l, -1);
}
static int lua_cb_register_read (lua_State *l) /* {{{ */
{
- static int count = 0;
int nargs = lua_gettop (l); /* number of arguments */
- clua_read_function_t *rf;
+ clua_callback_data_t *cb;
+ user_data_t ud;
- int num = count++; /* XXX FIXME: Not thread-safe! */
- char function_name[64];
+ int callback_id;
+ char function_name[DATA_MAX_NAME_LEN] = "";
if (nargs != 1)
{
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);
+ {
+ const char *tmp = lua_tostring (l, /* idx = */ 1);
+ ssnprintf (function_name, sizeof (function_name), "lua/%s", tmp);
+ }
- if (!lua_isfunction (l, /* stack pos = */ 1))
+ callback_id = clua_store_callback (l, /* idx = */ 1);
+ if (callback_id < 0)
{
- WARNING ("lua plugin: The first argument of collectd_register_read() "
- "must be a function.");
+ ERROR ("lua plugin: Storing callback function failed.");
RETURN_LUA (l, -1);
}
- ssnprintf (function_name, sizeof (function_name), "collectd.read_func_%i", num);
+ if (function_name[0] == 0)
+ ssnprintf (function_name, sizeof (function_name), "lua/callback_%i", callback_id);
- /* 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)
+ cb = malloc (sizeof (*cb));
+ if (cb == 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);
+ memset (cb, 0, sizeof (*cb));
+ cb->lua_state = l;
+ cb->callback_id = callback_id;
+ cb->lua_function_name = strdup (function_name);
- ssnprintf (cb_name, sizeof (cb_name), "lua/read_func_%i", num);
+ ud.data = cb;
+ ud.free_func = NULL; /* FIXME */
- plugin_register_complex_read (/* group = */ "lua",
- /* name = */ cb_name,
- /* callback = */ clua_read,
- /* interval = */ NULL,
- /* user_data = */ &ud);
- }
+ plugin_register_complex_read (/* group = */ "lua",
+ /* name = */ function_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 int lua_cb_register_write (lua_State *l) /* {{{ */
+{
+ int nargs = lua_gettop (l); /* number of arguments */
+ clua_callback_data_t *cb;
+ user_data_t ud;
+
+ int callback_id;
+ char function_name[DATA_MAX_NAME_LEN] = "";
+
+ if (nargs != 1)
+ {
+ WARNING ("lua plugin: collectd_register_read() called with an invalid "
+ "number of arguments (%i).", nargs);
+ RETURN_LUA (l, -1);
+ }
+
+ if (lua_isstring (l, /* stack pos = */ 1))
+ {
+ const char *tmp = lua_tostring (l, /* idx = */ 1);
+ ssnprintf (function_name, sizeof (function_name), "lua/%s", tmp);
+ }
+
+ callback_id = clua_store_callback (l, /* idx = */ 1);
+ if (callback_id < 0)
+ {
+ ERROR ("lua plugin: Storing callback function failed.");
+ RETURN_LUA (l, -1);
+ }
+
+ if (function_name[0] == 0)
+ ssnprintf (function_name, sizeof (function_name), "lua/callback_%i", callback_id);
+
+ cb = malloc (sizeof (*cb));
+ if (cb == NULL)
+ {
+ ERROR ("lua plugin: malloc failed.");
+ RETURN_LUA (l, -1);
+ }
+
+ memset (cb, 0, sizeof (*cb));
+ cb->lua_state = l;
+ cb->callback_id = callback_id;
+ cb->lua_function_name = strdup (function_name);
+ pthread_mutex_init (&cb->lock, /* attr = */ NULL);
+
+ ud.data = cb;
+ ud.free_func = NULL; /* FIXME */
+
+ plugin_register_write (/* name = */ function_name,
+ /* callback = */ clua_write,
+ /* user_data = */ &ud);
+
+ DEBUG ("lua plugin: Successful call to lua_cb_register_write().");
+
+ RETURN_LUA (l, 0);
+} /* }}} int lua_cb_register_write */
+
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 }
+ { "collectd_register_read", lua_cb_register_read },
+ { "collectd_register_write", lua_cb_register_write }
};
static void lua_script_free (lua_script_t *script) /* {{{ */
projects / collectd.git / blobdiff