MINOR: lua: dump general info

This patch adds function able to dump general haproxy information.

doc/lua-api/index.rst

@@ -270,6 +270,19 @@ Core class
   :param string filename: the filename that reference the map entries.
   :param string key: the key which will be deleted.
 
+.. js:function:: core.get_info()
+
+  **context**: body, init, task, action, sample-fetch, converter
+
+  Returns HAProxy core informations. We can found information like the uptime,
+  the pid, memory pool usage, tasks number, ...
+
+  These information are also returned by the management sockat via the command
+  "show info". See the management socket documentation fpor more information
+  about the content of these variables.
+
+  :returns: an array of values.
+
 .. js:function:: core.now()
 
   **context**: body, init, task, action

src/hlua_fcn.c

@@ -28,6 +28,10 @@
 /* Contains the class reference of the concat object. */
 static int class_concat_ref;
 
+#define STATS_LEN (INF_TOTAL_FIELDS)
+
+static struct field stats[STATS_LEN];
+
 /* This function gets a struct field and convert it in Lua
  * variable. The variable is pushed at the top of the stak.
  */
@@ -293,6 +297,21 @@ static int hlua_asctime_date(lua_State *L)
 	return hlua_parse_date(L, parse_asctime_date);
 }
 
+static int hlua_get_info(lua_State *L)
+{
+	int i;
+
+	stats_fill_info(stats, STATS_LEN);
+
+	lua_newtable(L);
+	for (i=0; i<INF_TOTAL_FIELDS; i++) {
+		lua_pushstring(L, info_field_names[i]);
+		hlua_fcn_pushfield(L, &stats[i]);
+		lua_settable(L, -3);
+	}
+	return 1;
+}
+
 static struct hlua_concat *hlua_check_concat(lua_State *L, int ud)
 {
 	return (struct hlua_concat *)(hlua_checkudata(L, ud, class_concat_ref));
@@ -426,6 +445,7 @@ int hlua_fcn_reg_core_fcn(lua_State *L)
 	hlua_class_function(L, "rfc850_date", hlua_rfc850_date);
 	hlua_class_function(L, "asctime_date", hlua_asctime_date);
 	hlua_class_function(L, "concat", hlua_concat_new);
+	hlua_class_function(L, "get_info", hlua_get_info);
 
 	return 5;
 }