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/* Scripting foo
* Copyright (C) 2020 NVIDIA Corporation
* Quentin Young
*
* 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; either version 2 of the License, or (at your option)
* any later version.
*
* 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; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "frrscript.h"
#include "memory.h"
#include "hash.h"
#include "log.h"
#include "frrlua.h"
/* Type encoders */
struct encoder {
char *typename;
int (*encoder)(struct lua_State *, const void *);
};
struct hash *encoder_hash;
static unsigned int encoder_hash_key(const void *data)
{
const struct encoder *e = data;
return string_hash_make(e->typename);
}
static bool encoder_hash_cmp(const void *d1, const void *d2)
{
return !strcmp(d1, d2);
}
static void *encoder_alloc(void *arg)
{
struct encoder *tmp = arg;
struct encoder *e = XCALLOC(MTYPE_TMP, sizeof(struct encoder));
e->typename = XSTRDUP(MTYPE_TMP, tmp->typename);
return e;
}
#if 0
static void encoder_free(struct encoder *e)
{
XFREE(MTYPE_TMP, e->typename);
XFREE(MTYPE_TMP, e);
}
#endif
/* Generic script APIs */
int frrscript_lua_call(struct frrscript *fs, ...)
{
/* Process arguments according to argspec in fs */
/* ... */
int ret = lua_pcall(fs->L, 0, 0, 0);
/* Process stack result according to argspec in fs */
/* ... */
/* LUA_OK is 0, so we can just return lua_pcall's result directly */
return ret;
}
void frrscript_register_type_encoder(const char *typename,
int (*encoder)(lua_State *L, void *))
{
struct encoder e = {
.typename = (char *) typename,
.encoder = NULL
};
if (hash_lookup(encoder_hash, &e)) {
zlog_backtrace(LOG_ERR);
assert(!"Type encoder double-registered.");
}
hash_get(encoder_hash, &e, encoder_alloc);
}
struct frrscript *frrscript_load(const char *name,
int (*load_cb)(struct frrscript *))
{
struct frrscript *fs = XCALLOC(MTYPE_TMP, sizeof(struct frrscript));
fs->name = XSTRDUP(MTYPE_TMP, name);
fs->L = luaL_newstate();
char fname[MAXPATHLEN];
snprintf(fname, sizeof(fname), FRRSCRIPT_PATH "/%s.lua", fs->name);
if (luaL_loadfile(fs->L, fname) != LUA_OK)
goto fail;
if (load_cb && (*load_cb)(fs) != 0)
goto fail;
return fs;
fail:
frrscript_unload(fs);
return NULL;
}
void frrscript_unload(struct frrscript *fs)
{
XFREE(MTYPE_TMP, fs->name);
XFREE(MTYPE_TMP, fs);
}
void frrscript_init()
{
encoder_hash = hash_create(encoder_hash_key, encoder_hash_cmp, "Lua type encoders");
}
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