libs/lucittpd/src/include/lib/luaplugin.h

   1 /*
   2  * luaplugin - fast lua plugin indexing
   3  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #ifndef __LUAPLUGIN_H
  15 #define __LUAPLUGIN_H
  16
  17 #include <sys/time.h>
  18 #include <lualib.h>
  19 #include <lauxlib.h>
  20 #include <stdbool.h>
  21 #include "list.h"
  22
  23 struct luaplugin_entry {
  24         struct luaplugin_ctx *ctx;
  25         struct list_head list;
  26         time_t timestamp;
  27         int checked;
  28         bool loaded;
  29         bool reload;
  30         char *name;
  31         char *module;
  32
  33         /* privdata for the caller */
  34         void *priv;
  35 };
  36
  37 struct luaplugin_ctx {
  38         const char *path;
  39         const struct luaplugin_ops *ops;
  40         lua_State *L;
  41         int checked;
  42         struct list_head *last;
  43         struct list_head entries;
  44 };
  45
  46 /** luaplugin_init:
  47  * initialize the luaplugin context (allocates a new lua context)
  48  */
  49 extern int luaplugin_init(struct luaplugin_ctx *ctx, const char *path);
  50
  51 /** luaplugin_scan:
  52  * rescan the plugin cache
  53  */
  54 extern void luaplugin_scan(struct luaplugin_ctx *ctx);
  55
  56 /** luaplugin_call:
  57  * call out to a lua function.
  58  * to be able to use this, you need to push the function name on the lua stack (ctx->L)
  59  * and then narg function arguments afterwards.
  60  * this call pops (narg + 1) arguments from the stack
  61  * returns -ENOENT if the function was not found
  62  */
  63 extern int luaplugin_call(struct luaplugin_entry *e, int narg);
  64
  65 /** luaplugin_done:
  66  * drop the luaplugin context (and associated lua context)
  67  * frees all memory allocated by the library
  68  */
  69 extern void luaplugin_done(struct luaplugin_ctx *ctx);
  70
  71 #endif