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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 <stdarg.h>
#include "frrscript.h"
#include "memory.h"
#include "hash.h"
#include "log.h"
#include "frrlua.h"
/* Type encoders */
struct encoder {
char *typename;
encoder_func encoder;
};
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)
{
const struct encoder *e1 = d1;
const struct encoder *e2 = d2;
return strmatch(e1->typename, e2->typename);
}
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);
e->encoder = tmp->encoder;
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, ...)
{
va_list vl;
va_start(vl, fs);
int nargs = va_arg(vl, int);
assert(nargs % 3 == 0);
zlog_debug("%s: Script '%s' called with # args: %d", __func__, fs->name,
nargs);
struct encoder e = {};
void *arg;
const char *bindname;
/* Encode script arguments */
for (int i = 0; i < nargs; i += 3) {
bindname = va_arg(vl, const char *);
e.typename = va_arg(vl, char *);
arg = va_arg(vl, void *);
zlog_debug("Script argument | Bind name: %s | Type: %s",
bindname, e.typename);
struct encoder *enc = hash_lookup(encoder_hash, &e);
assert(enc
&& "No encoder for type; rerun with debug logs to see more");
enc->encoder(fs->L, arg);
lua_setglobal(fs->L, bindname);
}
int nresults = va_arg(vl, int);
zlog_debug("Expected script results: %d", nresults);
int ret = lua_pcall(fs->L, 0, nresults, 0);
switch (ret) {
case LUA_OK:
break;
case LUA_ERRRUN:
zlog_err("Script '%s' runtime error: %s", fs->name, lua_tostring(fs->L, -1));
break;
case LUA_ERRMEM:
zlog_err("Script '%s' memory error: %s", fs->name, lua_tostring(fs->L, -1));
break;
case LUA_ERRERR:
zlog_err("Script '%s' error handler error: %s", fs->name, lua_tostring(fs->L, -1));
break;
case LUA_ERRGCMM:
zlog_err("Script '%s' garbage collector error: %s", fs->name, lua_tostring(fs->L, -1));
break;
default:
zlog_err("Script '%s' unknown error: %s", fs->name, lua_tostring(fs->L, -1));
break;
}
if (ret != LUA_OK)
lua_pop(fs->L, 1);
/* After script returns, decode results */
for (int i = 0; i < nresults; i++) {
const char *resultname = va_arg(vl, const char *);
fprintf(stderr, "result: %s\n", resultname);
}
/* LUA_OK is 0, so we can just return lua_pcall's result directly */
return ret;
}
void frrscript_register_type_encoder(const char *typename, encoder_func encoder)
{
struct encoder e = {.typename = (char *)typename, .encoder = encoder};
if (hash_lookup(encoder_hash, &e)) {
zlog_backtrace(LOG_ERR);
assert(!"Type encoder double-registered.");
}
assert(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();
frrlua_export_logging(fs->L);
char fname[MAXPATHLEN];
snprintf(fname, sizeof(fname), FRRSCRIPT_PATH "/%s.lua", fs->name);
int ret = luaL_loadfile(fs->L, fname);
switch (ret) {
case LUA_OK:
break;
case LUA_ERRSYNTAX:
zlog_err("Failed loading script '%s': syntax error: %s", fname,
lua_tostring(fs->L, -1));
break;
case LUA_ERRMEM:
zlog_err("Failed loading script '%s': out-of-memory error: %s",
fname, lua_tostring(fs->L, -1));
break;
case LUA_ERRGCMM:
zlog_err(
"Failed loading script '%s': garbage collector error: %s",
fname, lua_tostring(fs->L, -1));
break;
case LUA_ERRFILE:
zlog_err("Failed loading script '%s': file read error: %s",
fname, lua_tostring(fs->L, -1));
break;
default:
zlog_err("Failed loading script '%s': unknown error: %s", fname,
lua_tostring(fs->L, -1));
break;
}
if (ret != 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)
{
lua_close(fs->L);
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");
/* Register core library types */
frrscript_register_type_encoder("prefix",
(encoder_func)frrlua_newtable_prefix);
frrscript_register_type_encoder(
"interface", (encoder_func)frrlua_newtable_interface);
}
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