lua: add support for registering methods

Signed-off-by: John Crispin <blogic@openwrt.org>
This commit is contained in:
Felix Fietkau 2012-09-27 14:00:49 +02:00
parent 0371c8f5fd
commit c382792d98

View file

@ -1,5 +1,6 @@
/*
* Copyright (C) 2012 Jo-Philipp Wich <jow@openwrt.org>
* Copyright (C) 2012 John Crispin <blogic@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
@ -14,12 +15,14 @@
#include <unistd.h>
#include <libubus.h>
#include <libubox/blobmsg.h>
#include <libubox/blobmsg_json.h>
#include <lauxlib.h>
#define MODNAME "ubus"
#define METANAME MODNAME ".meta"
static lua_State *state;
struct ubus_lua_connection {
int timeout;
@ -27,6 +30,10 @@ struct ubus_lua_connection {
struct ubus_context *ctx;
};
struct ubus_lua_object {
struct ubus_object o;
int r;
};
static int
ubus_lua_parse_blob(lua_State *L, struct blob_attr *attr, bool table);
@ -270,6 +277,199 @@ ubus_lua_objects(lua_State *L)
return 1;
}
static int
ubus_method_handler(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg)
{
struct ubus_lua_object *o = container_of(obj, struct ubus_lua_object, o);
lua_getglobal(state, "__ubus_cb");
lua_rawgeti(state, -1, o->r);
lua_getfield(state, -1, method);
if (lua_isfunction(state, -1)) {
lua_pushlightuserdata(state, req);
lua_call(state, 1, 0);
}
return 0;
}
static int lua_gettablelen(lua_State *L, int index)
{
int cnt = 0;
lua_pushnil(L);
index -= 1;
while (lua_next(L, index) != 0) {
cnt++;
lua_pop(L, 1);
}
return cnt;
}
static int ubus_lua_reply(lua_State *L)
{
struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
struct ubus_request_data *req;
luaL_checktype(L, 3, LUA_TTABLE);
blob_buf_init(&c->buf, 0);
if (!ubus_lua_format_blob_array(L, &c->buf, true))
{
lua_pushnil(L);
lua_pushinteger(L, UBUS_STATUS_INVALID_ARGUMENT);
return 2;
}
req = lua_touserdata(L, 2);
ubus_send_reply(c->ctx, req, c->buf.head);
return 0;
}
static int ubus_lua_load_methods(lua_State *L, struct ubus_method *m)
{
struct blobmsg_policy *p;
int plen;
int pidx = 0;
/* get the function pointer */
lua_pushinteger(L, 1);
lua_gettable(L, -2);
/* get the policy table */
lua_pushinteger(L, 2);
lua_gettable(L, -3);
plen = lua_gettablelen(L, -1);
/* check if the method table is valid */
if ((lua_type(L, -2) != LUA_TFUNCTION) ||
(lua_type(L, -1) != LUA_TTABLE) ||
lua_objlen(L, -1) || !plen) {
lua_pop(L, 2);
return 1;
}
/* store function pointer */
lua_pushvalue(L, -2);
lua_setfield(L, -6, lua_tostring(L, -5));
/* setup the policy pointers */
p = malloc(sizeof(struct blobmsg_policy) * plen);
memset(p, 0, sizeof(struct blobmsg_policy) * plen);
m->policy = p;
lua_pushnil(L);
while (lua_next(L, -2) != 0) {
int val = lua_tointeger(L, -1);
/* check if the policy is valid */
if ((lua_type(L, -2) != LUA_TSTRING) ||
(lua_type(L, -1) != LUA_TNUMBER) ||
(val < 0) ||
(val > BLOBMSG_TYPE_LAST)) {
lua_pop(L, 1);
continue;
}
p[pidx].name = lua_tostring(L, -2);
p[pidx].type = val;
lua_pop(L, 1);
pidx++;
}
m->n_policy = pidx;
m->name = lua_tostring(L, -4);
m->handler = ubus_method_handler;
lua_pop(L, 2);
return 0;
}
static struct ubus_object* ubus_lua_load_object(lua_State *L)
{
struct ubus_lua_object *obj = NULL;
int mlen = lua_gettablelen(L, -1);
struct ubus_method *m;
int midx = 0;
/* setup object pointers */
obj = malloc(sizeof(struct ubus_lua_object));
memset(obj, 0, sizeof(struct ubus_lua_object));
obj->o.name = lua_tostring(L, -2);
/* setup method pointers */
m = malloc(sizeof(struct ubus_method) * mlen);
memset(m, 0, sizeof(struct ubus_method) * mlen);
obj->o.methods = m;
/* setup type pointers */
obj->o.type = malloc(sizeof(struct ubus_object_type));
memset(obj->o.type, 0, sizeof(struct ubus_object_type));
obj->o.type->name = lua_tostring(L, -2);
obj->o.type->id = 0;
obj->o.type->methods = obj->o.methods;
/* create the he callback lookup table */
lua_createtable(L, 1, 0);
lua_getglobal(L, "__ubus_cb");
lua_pushvalue(L, -2);
obj->r = luaL_ref(L, -2);
lua_pop(L, 1);
/* scan each method */
lua_pushnil(L);
while (lua_next(L, -3) != 0) {
/* check if it looks like a method */
if ((lua_type(L, -2) != LUA_TSTRING) ||
(lua_type(L, -1) != LUA_TTABLE) ||
!lua_objlen(L, -1)) {
lua_pop(L, 1);
continue;
}
if (!ubus_lua_load_methods(L, &m[midx]))
midx++;
lua_pop(L, 1);
}
obj->o.type->n_methods = obj->o.n_methods = midx;
/* pop the callback table */
lua_pop(L, 1);
return &obj->o;
}
static int ubus_lua_add(lua_State *L)
{
struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
/* verify top level object */
if (lua_istable(L, 1)) {
lua_pushstring(L, "you need to pass a table");
lua_error(L);
return 0;
}
/* scan each object */
lua_pushnil(L);
while (lua_next(L, -2) != 0) {
struct ubus_object *obj = NULL;
/* check if the object has a table of methods */
if ((lua_type(L, -2) == LUA_TSTRING) && (lua_type(L, -1) == LUA_TTABLE)) {
obj = ubus_lua_load_object(L);
if (obj)
ubus_add_object(c->ctx, obj);
}
lua_pop(L, 1);
}
return 0;
}
static void
ubus_lua_signatures_cb(struct ubus_context *c, struct ubus_object_data *o, void *p)
@ -317,7 +517,7 @@ ubus_lua_call_cb(struct ubus_request *req, int type, struct blob_attr *msg)
static int
ubus_lua_call(lua_State *L)
{
int rv;
int rv, top;
uint32_t id;
struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
const char *path = luaL_checkstring(L, 2);
@ -342,6 +542,7 @@ ubus_lua_call(lua_State *L)
return 2;
}
top = lua_gettop(L);
rv = ubus_invoke(c->ctx, id, func, c->buf.head, ubus_lua_call_cb, L, c->timeout * 1000);
if (rv != UBUS_STATUS_OK)
@ -352,7 +553,7 @@ ubus_lua_call(lua_State *L)
return 2;
}
return 1;
return lua_gettop(L) - top;
}
@ -373,6 +574,8 @@ ubus_lua__gc(lua_State *L)
static const luaL_Reg ubus[] = {
{ "connect", ubus_lua_connect },
{ "objects", ubus_lua_objects },
{ "add", ubus_lua_add },
{ "reply", ubus_lua_reply },
{ "signatures", ubus_lua_signatures },
{ "call", ubus_lua_call },
{ "close", ubus_lua__gc },
@ -400,5 +603,30 @@ luaopen_ubus(lua_State *L)
/* create module */
luaL_register(L, MODNAME, ubus);
/* set some enum defines */
lua_pushinteger(L, BLOBMSG_TYPE_ARRAY);
lua_setfield(L, -2, "ARRAY");
lua_pushinteger(L, BLOBMSG_TYPE_TABLE);
lua_setfield(L, -2, "TABLE");
lua_pushinteger(L, BLOBMSG_TYPE_STRING);
lua_setfield(L, -2, "STRING");
lua_pushinteger(L, BLOBMSG_TYPE_INT64);
lua_setfield(L, -2, "INT64");
lua_pushinteger(L, BLOBMSG_TYPE_INT32);
lua_setfield(L, -2, "INT32");
lua_pushinteger(L, BLOBMSG_TYPE_INT16);
lua_setfield(L, -2, "INT16");
lua_pushinteger(L, BLOBMSG_TYPE_INT8);
lua_setfield(L, -2, "INT8");
lua_pushinteger(L, BLOBMSG_TYPE_BOOL);
lua_setfield(L, -2, "BOOLEAN");
/* used in our callbacks */
state = L;
/* create the callback table */
lua_createtable(L, 1, 0);
lua_setglobal(L, "__ubus_cb");
return 0;
}