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#include <stdlib.h>
#include <time.h>
#include <assert.h>
#include "mod_magnet_cache.h"
#include "stat_cache.h"
#ifdef HAVE_LUA_H
#include <lualib.h>
#include <lauxlib.h>
script *script_init() {
script *sc;
sc = calloc(1, sizeof(*sc));
sc->name = buffer_init();
sc->etag = buffer_init();
return sc;
}
void script_free(script *sc) {
if (!sc) return;
lua_pop(sc->L, 1); /* the function copy */
buffer_free(sc->name);
buffer_free(sc->etag);
lua_close(sc->L);
free(sc);
}
script_cache *script_cache_init() {
script_cache *p;
p = calloc(1, sizeof(*p));
return p;
}
void script_cache_free(script_cache *p) {
size_t i;
if (!p) return;
for (i = 0; i < p->used; i++) {
script_free(p->ptr[i]);
}
free(p->ptr);
free(p);
}
lua_State *script_cache_get_script(server *srv, connection *con, script_cache *cache, buffer *name) {
size_t i;
script *sc = NULL;
stat_cache_entry *sce;
for (i = 0; i < cache->used; i++) {
sc = cache->ptr[i];
if (buffer_is_equal(name, sc->name)) {
sc->last_used = time(NULL);
/* oops, the script failed last time */
if (lua_gettop(sc->L) == 0) break;
if (HANDLER_ERROR == stat_cache_get_entry(srv, con, sc->name, &sce)) {
lua_pop(sc->L, 1); /* pop the old function */
break;
}
if (!buffer_is_equal(sce->etag, sc->etag)) {
/* the etag is outdated, reload the function */
lua_pop(sc->L, 1);
break;
}
assert(lua_isfunction(sc->L, -1));
lua_pushvalue(sc->L, -1); /* copy the function-reference */
return sc->L;
}
sc = NULL;
}
/* if the script was script already loaded but either got changed or
* failed to load last time */
if (sc == NULL) {
sc = script_init();
if (cache->size == 0) {
cache->size = 16;
cache->ptr = malloc(cache->size * sizeof(*(cache->ptr)));
} else if (cache->used == cache->size) {
cache->size += 16;
cache->ptr = realloc(cache->ptr, cache->size * sizeof(*(cache->ptr)));
}
cache->ptr[cache->used++] = sc;
buffer_copy_string_buffer(sc->name, name);
sc->L = luaL_newstate();
luaL_openlibs(sc->L);
}
sc->last_used = time(NULL);
if (0 != luaL_loadfile(sc->L, name->ptr)) {
/* oops, an error, return it */
return sc->L;
}
if (HANDLER_GO_ON == stat_cache_get_entry(srv, con, sc->name, &sce)) {
buffer_copy_string_buffer(sc->etag, sce->etag);
}
/**
* pcall() needs the function on the stack
*
* as pcall() will pop the script from the stack when done, we have to
* duplicate it here
*/
assert(lua_isfunction(sc->L, -1));
lua_pushvalue(sc->L, -1); /* copy the function-reference */
return sc->L;
}
#endif
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