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/*-
* Copyright 2016 Vsevolod Stakhov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "lua_common.h"
#include "cdb.h"
#define CDB_REFRESH_TIME 60
LUA_FUNCTION_DEF (cdb, create);
LUA_FUNCTION_DEF (cdb, lookup);
LUA_FUNCTION_DEF (cdb, get_name);
LUA_FUNCTION_DEF (cdb, destroy);
static const struct luaL_reg cdblib_m[] = {
LUA_INTERFACE_DEF (cdb, lookup),
LUA_INTERFACE_DEF (cdb, get_name),
{"__tostring", rspamd_lua_class_tostring},
{"__gc", lua_cdb_destroy},
{NULL, NULL}
};
static const struct luaL_reg cdblib_f[] = {
LUA_INTERFACE_DEF (cdb, create),
{NULL, NULL}
};
static struct cdb *
lua_check_cdb (lua_State * L)
{
void *ud = rspamd_lua_check_udata (L, 1, "rspamd{cdb}");
luaL_argcheck (L, ud != NULL, 1, "'cdb' expected");
return ud ? *((struct cdb **)ud) : NULL;
}
static gint
lua_cdb_create (lua_State *L)
{
struct cdb *cdb, **pcdb;
const gchar *filename;
gint fd;
filename = luaL_checkstring (L, 1);
/* If file begins with cdb://, just skip it */
if (g_ascii_strncasecmp (filename, "cdb://", sizeof ("cdb://") - 1) == 0) {
filename += sizeof ("cdb://") - 1;
}
if ((fd = open (filename, O_RDONLY)) == -1) {
msg_warn ("cannot open cdb: %s, %s", filename, strerror (errno));
lua_pushnil (L);
}
else {
cdb = g_malloc (sizeof (struct cdb));
cdb->filename = g_strdup (filename);
cdb->check_timer_ev = NULL;
cdb->check_timer_tv = NULL;
if (cdb_init (cdb, fd) == -1) {
msg_warn ("cannot open cdb: %s, %s", filename, strerror (errno));
lua_pushnil (L);
}
else {
pcdb = lua_newuserdata (L, sizeof (struct cdb *));
rspamd_lua_setclass (L, "rspamd{cdb}", -1);
*pcdb = cdb;
}
}
return 1;
}
static gint
lua_cdb_get_name (lua_State *L)
{
struct cdb *cdb = lua_check_cdb (L);
if (!cdb) {
lua_error (L);
return 1;
}
lua_pushstring (L, cdb->filename);
return 1;
}
static gint
lua_cdb_lookup (lua_State *L)
{
struct cdb *cdb = lua_check_cdb (L);
const gchar *what;
gchar *value;
gsize vlen;
gint64 vpos;
if (!cdb) {
lua_error (L);
return 1;
}
/*
* XXX: this code is placed here because event_loop is called inside workers, so start
* monitoring on first check, not on creation
*/
if (cdb->check_timer_ev == NULL) {
cdb_add_timer (cdb, CDB_REFRESH_TIME);
}
what = luaL_checkstring (L, 2);
if (cdb_find (cdb, what, strlen (what)) > 0) {
/* Extract and push value to lua as string */
vpos = cdb_datapos (cdb);
vlen = cdb_datalen (cdb);
value = g_malloc (vlen);
cdb_read (cdb, value, vlen, vpos);
lua_pushlstring (L, value, vlen);
g_free (value);
}
else {
lua_pushnil (L);
}
return 1;
}
static gint
lua_cdb_destroy (lua_State *L)
{
struct cdb *cdb = lua_check_cdb (L);
if (cdb) {
cdb_free (cdb);
(void)close (cdb->cdb_fd);
g_free (cdb->filename);
g_free (cdb);
}
return 0;
}
static gint
lua_load_cdb (lua_State *L)
{
lua_newtable (L);
luaL_register (L, NULL, cdblib_f);
return 1;
}
void
luaopen_cdb (lua_State * L)
{
luaL_newmetatable (L, "rspamd{cdb}");
lua_pushstring (L, "__index");
lua_pushvalue (L, -2);
lua_settable (L, -3);
lua_pushstring (L, "class");
lua_pushstring (L, "rspamd{cdb}");
lua_rawset (L, -3);
luaL_register (L, NULL, cdblib_m);
lua_pop (L, 1); /* remove metatable from stack */
rspamd_lua_add_preload (L, "rspamd_cdb", lua_load_cdb);
}
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