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/* $%BEGINLICENSE%$
Copyright (C) 2008 MySQL AB, 2008 Sun Microsystems, Inc
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
$%ENDLICENSE%$ */
#include <string.h>
/**
* expose the chassis functions into the lua space
* Also moves the global print function to the 'os' table and
* replaces print with our logging function at a log level equal to
* the current chassis minimum log level, so that we always see the
* output of scripts.
*/
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#include <glib.h>
#include "chassis-mainloop.h"
#include "chassis-plugin.h"
#include "chassis-stats.h"
#include "lua-registry-keys.h"
static int lua_chassis_set_shutdown (lua_State G_GNUC_UNUSED *L) {
chassis_set_shutdown();
return 0;
}
/**
* helper function to set GHashTable key, value pairs in a Lua table
* assumes to have a table on top of the stack.
*/
static void chassis_stats_setluaval(gpointer key, gpointer val, gpointer userdata) {
const gchar *name = key;
const guint value = GPOINTER_TO_UINT(val);
lua_State *L = userdata;
g_assert(lua_istable(L, -1));
lua_checkstack(L, 2);
lua_pushstring(L, name);
lua_pushinteger(L, value);
lua_settable(L, -3);
}
/**
* Expose the plugin stats hashes to Lua for post-processing.
*
* Lua parameters: plugin name to fetch stats for (or "chassis" for only getting the global ones)
* might be omitted, then this function gets stats for all plugins, including the chassis
* Lua return values: nil if the plugin is not loaded
* a table with the stats when given one plugin name
* a table with the plugin names as keys and their values as subtables, the chassis global stats are keyed as "chassis"
*/
static int lua_chassis_stats(lua_State *L) {
const char *plugin_name = NULL;
chassis *chas = NULL;
chassis_plugin *plugin = NULL;
guint i = 0;
gboolean found_stats = FALSE;
int nargs = lua_gettop(L);
if (nargs == 0) {
plugin_name = NULL;
} else if (nargs == 1) { /* grab only the stats we were asked to fetch */
plugin_name = luaL_checkstring(L, 1);
} else {
return luaL_argerror(L, 2, "currently only zero or one arguments are allowed");
}
lua_newtable(L); /* the table for the stats, either containing sub tables or the stats for the single plugin requested */
/* retrieve the chassis stored in the registry */
lua_getfield(L, LUA_REGISTRYINDEX, CHASSIS_LUA_REGISTRY_KEY);
chas = (chassis*) lua_topointer(L, -1);
lua_pop(L, 1);
/* get the global chassis stats */
if (nargs == 0 && chas) {
GHashTable *stats_hash = chassis_stats_get(chas->stats);
if (stats_hash == NULL) {
found_stats = FALSE;
} else {
found_stats = TRUE;
lua_newtable(L);
g_hash_table_foreach(stats_hash, chassis_stats_setluaval, L);
lua_setfield(L, -2, "chassis");
g_hash_table_destroy(stats_hash);
}
}
if (chas && chas->modules) {
for (i = 0; i < chas->modules->len; i++) {
plugin = chas->modules->pdata[i];
if (plugin->stats != NULL && plugin->get_stats != NULL) {
GHashTable *stats_hash = NULL;
if (plugin_name == NULL) {
/* grab all stats and key them by plugin name */
stats_hash = plugin->get_stats(plugin->stats);
if (stats_hash != NULL) {
found_stats = TRUE;
}
/* the per-plugin table */
lua_newtable(L);
g_hash_table_foreach(stats_hash, chassis_stats_setluaval, L);
lua_setfield(L, -2, plugin->name);
g_hash_table_destroy(stats_hash);
} else if (g_ascii_strcasecmp(plugin_name, "chassis") == 0) {
/* get the global chassis stats */
stats_hash = chassis_stats_get(chas->stats);
if (stats_hash == NULL) {
found_stats = FALSE;
break;
}
found_stats = TRUE;
g_hash_table_foreach(stats_hash, chassis_stats_setluaval, L);
g_hash_table_destroy(stats_hash);
break;
} else if (g_ascii_strcasecmp(plugin_name, plugin->name) == 0) {
/* check for the correct name and get the stats */
stats_hash = plugin->get_stats(plugin->stats);
if (stats_hash == NULL) {
found_stats = FALSE;
break;
}
found_stats = TRUE;
/* the table to use is already on the stack */
g_hash_table_foreach(stats_hash, chassis_stats_setluaval, L);
g_hash_table_destroy(stats_hash);
break;
}
}
}
}
/* can also be FALSE if we couldn't find the chassis */
if (!found_stats) {
lua_pop(L, 1); /* pop the unused stats table */
lua_pushnil(L);
return 1;
}
return 1;
}
/**
* Log a message via the chassis log facility instead of using STDOUT.
* This is more expensive than just printing to STDOUT, but generally logging
* in a script would be protected by an 'if(debug)' or be important enough to
* warrant the extra CPU cycles.
*
* Lua parameters: loglevel (first), message (second)
*/
static int lua_chassis_log(lua_State *L) {
static const char *const log_names[] = {"error", "critical",
"warning", "message", "info", "debug", NULL};
static const int log_levels[] = {G_LOG_LEVEL_ERROR, G_LOG_LEVEL_CRITICAL,
G_LOG_LEVEL_WARNING, G_LOG_LEVEL_MESSAGE,
G_LOG_LEVEL_INFO, G_LOG_LEVEL_DEBUG};
int option = luaL_checkoption(L, 1, "message", log_names);
const char *log_message = luaL_optstring(L, 2, "nil");
const char *source = NULL;
const char *first_source = "unknown";
int currentline = -1;
int first_line = -1;
int stackdepth = 1;
lua_Debug ar;
chassis *chas;
/* try to get some information about who logs this message */
do {
/* walk up the stack to try to find a file name */
if (!lua_getstack(L, stackdepth, &ar)) break;
if (!lua_getinfo(L, "Sl", &ar)) break;
currentline = ar.currentline;
source = ar.source;
/* save the first short_src we have encountered,
in case we exceed our max stackdepth to check
*/
if (stackdepth == 1) {
first_source = ar.short_src;
first_line = ar.currentline;
}
/* below: '@' comes from Lua's dofile, our lua-load-factory doesn't set it when we load a file. */
} while (++stackdepth < 11 && source && source[0] != '/' && source[0] != '@'); /* limit walking the stack to a sensible value */
if (source) {
if (source[0] == '@') {
/* skip Lua's "this is from a file" indicator */
source++;
}
lua_getfield(L, LUA_REGISTRYINDEX, CHASSIS_LUA_REGISTRY_KEY);
chas = (chassis*) lua_topointer(L, -1);
lua_pop(L, 1);
if (chas && chas->base_dir) {
if (g_str_has_prefix(source, chas->base_dir)) {
source += strlen(chas->base_dir);
/* skip a leading dir separator */
if (source[0] == G_DIR_SEPARATOR) source++;
}
}
}
g_log(G_LOG_DOMAIN, log_levels[option], "(%s:%d) %s", (source ? source : first_source),
(source ? currentline : first_line), log_message);
return 0;
}
/**
* these wrapper functions insert the appropriate log level into the stack
* and then simply call lua_chassis_log()
*/
#define CHASSIS_LUA_LOG(level) static int lua_chassis_log_ ## level(lua_State *L) {\
int n = lua_gettop(L);\
int retval;\
lua_pushliteral(L, #level);\
lua_insert(L, 1);\
retval = lua_chassis_log(L);\
lua_remove(L, 1);\
g_assert(n == lua_gettop(L));\
return retval;\
}
CHASSIS_LUA_LOG(error)
CHASSIS_LUA_LOG(critical)
CHASSIS_LUA_LOG(warning)
/* CHASSIS_LUA_LOG(message)*/
CHASSIS_LUA_LOG(info)
CHASSIS_LUA_LOG(debug)
#undef CHASSIS_LUA_LOG
static int lua_chassis_log_message(lua_State *L) {
int n = lua_gettop(L);
int retval;
lua_pushliteral(L, "message");
lua_insert(L, 1);
retval = lua_chassis_log(L);
lua_remove(L, 1);
g_assert(n == lua_gettop(L));
return retval;
}
static int lua_g_mem_profile(lua_State G_GNUC_UNUSED *L) {
g_mem_profile();
return 0;
}
/*
** Assumes the table is on top of the stack.
*/
static void set_info (lua_State *L) {
lua_pushliteral (L, "_COPYRIGHT");
lua_pushliteral (L, "Copyright (c) 2008 MySQL AB, 2008 Sun Microsystems, Inc.");
lua_settable (L, -3);
lua_pushliteral (L, "_DESCRIPTION");
lua_pushliteral (L, "export chassis-functions as chassis.*");
lua_settable (L, -3);
lua_pushliteral (L, "_VERSION");
lua_pushliteral (L, "LuaChassis 0.2");
lua_settable (L, -3);
}
#define CHASSIS_LUA_LOG_FUNC(level) {#level, lua_chassis_log_ ## level}
static const struct luaL_reg chassislib[] = {
{"set_shutdown", lua_chassis_set_shutdown},
{"log", lua_chassis_log},
/* we don't really want g_error being exposed, since it abort()s */
/* CHASSIS_LUA_LOG_FUNC(error), */
CHASSIS_LUA_LOG_FUNC(critical),
CHASSIS_LUA_LOG_FUNC(warning),
CHASSIS_LUA_LOG_FUNC(message),
CHASSIS_LUA_LOG_FUNC(info),
CHASSIS_LUA_LOG_FUNC(debug),
/* to get the stats of a plugin, exposed as a table */
{"get_stats", lua_chassis_stats},
{"mem_profile", lua_g_mem_profile},
{NULL, NULL},
};
#undef CHASSIS_LUA_LOG_FUNC
/**
* moves the global function 'print' to the 'os' table and
* places 'lua_chassis_log_message' it its place.
*/
static void remap_print(lua_State *L) {
int n = lua_gettop(L);
lua_getglobal(L, "os"); /* sp = 1 */
lua_getglobal(L, "print"); /* sp = 2 */
lua_setfield(L, -2, "print"); /* sp = 1*/
lua_pop(L, 1); /* table os. sp = 0*/
lua_register(L, "print", lua_chassis_log_message);
g_assert(n == lua_gettop(L));
}
#if defined(_WIN32)
# define LUAEXT_API __declspec(dllexport)
#else
# define LUAEXT_API extern
#endif
LUAEXT_API int luaopen_chassis (lua_State *L) {
luaL_register (L, "chassis", chassislib);
set_info (L);
remap_print(L);
return 1;
}
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