implement Lua binding

This commit is contained in:
Jo-Philipp Wich 2012-05-05 22:37:46 +02:00
parent 3706552c1c
commit 25b9b4b827
3 changed files with 450 additions and 0 deletions

View file

@ -3,6 +3,8 @@ cmake_minimum_required(VERSION 2.6)
PROJECT(ubus C)
ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -g3)
OPTION(BUILD_LUA "build Lua plugin" ON)
SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")
IF(APPLE)
@ -25,6 +27,8 @@ TARGET_LINK_LIBRARIES(ubus-example ubus ubox)
SET(CMAKE_INSTALL_PREFIX /usr)
ADD_SUBDIRECTORY(lua)
INSTALL(TARGETS ubus cli
LIBRARY DESTINATION lib
RUNTIME DESTINATION bin

51
lua/CMakeLists.txt Normal file
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@ -0,0 +1,51 @@
cmake_minimum_required(VERSION 2.6)
PROJECT(ubus C)
SET(CMAKE_INSTALL_PREFIX /)
IF(NOT LUA_CFLAGS)
FIND_PROGRAM(PKG_CONFIG pkg-config)
IF(PKG_CONFIG)
EXECUTE_PROCESS(
COMMAND pkg-config --silence-errors --cflags lua5.1
OUTPUT_VARIABLE LUA_CFLAGS
OUTPUT_STRIP_TRAILING_WHITESPACE
)
ENDIF()
ENDIF()
ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -g3 -I.. ${LUA_CFLAGS})
LINK_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/..)
IF(APPLE)
SET(CMAKE_SHARED_MODULE_CREATE_C_FLAGS "${CMAKE_SHARED_MODULE_CREATE_C_FLAGS} -undefined dynamic_lookup")
ENDIF(APPLE)
IF(NOT LUAPATH)
EXECUTE_PROCESS(
COMMAND lua -e "for k in string.gmatch(package.cpath .. \";\", \"([^;]+)/..so;\") do if k:sub(1,1) == \"/\" then print(k) break end end"
OUTPUT_VARIABLE LUAPATH
RESULT_VARIABLE LUA_CHECK_RES
OUTPUT_STRIP_TRAILING_WHITESPACE
)
IF(BUILD_LUA)
IF(NOT ${LUA_CHECK_RES} EQUAL 0 OR ${LUAPATH} EQUAL "")
MESSAGE(SEND_ERROR "Lua was not found on your system")
ENDIF()
ENDIF()
ENDIF()
IF(BUILD_LUA)
ADD_LIBRARY(ubus_lua MODULE ubus.c)
SET_TARGET_PROPERTIES(ubus_lua PROPERTIES
OUTPUT_NAME ubus
PREFIX ""
)
TARGET_LINK_LIBRARIES(ubus_lua ubus)
INSTALL(TARGETS ubus_lua
LIBRARY DESTINATION ${LUAPATH}
)
ENDIF()

395
lua/ubus.c Normal file
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@ -0,0 +1,395 @@
/*
* Copyright (C) 2012 Jo-Philipp Wich <jow@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
* as published by the Free Software Foundation
*
* 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.
*/
#include <unistd.h>
#include <libubus.h>
#include <libubox/blobmsg.h>
#include <lauxlib.h>
#define MODNAME "ubus"
#define METANAME MODNAME ".meta"
struct ubus_lua_connection {
int timeout;
struct blob_buf buf;
struct ubus_context *ctx;
};
static int
ubus_lua_parse_blob(lua_State *L, struct blob_attr *attr, bool table);
static int
ubus_lua_parse_blob_array(lua_State *L, struct blob_attr *attr, int len, bool table)
{
int rv;
int idx = 1;
int rem = len;
struct blob_attr *pos;
lua_newtable(L);
__blob_for_each_attr(pos, attr, rem)
{
rv = ubus_lua_parse_blob(L, pos, table);
if (rv > 1)
lua_rawset(L, -3);
else if (rv > 0)
lua_rawseti(L, -2, idx++);
}
return 1;
}
static int
ubus_lua_parse_blob(lua_State *L, struct blob_attr *attr, bool table)
{
int len;
int off = 0;
void *data;
char buf[32];
if (!blobmsg_check_attr(attr, false))
return 0;
if (table && blobmsg_name(attr)[0])
{
lua_pushstring(L, blobmsg_name(attr));
off++;
}
data = blobmsg_data(attr);
len = blobmsg_data_len(attr);
switch (blob_id(attr))
{
case BLOBMSG_TYPE_BOOL:
lua_pushboolean(L, *(uint8_t *)data);
break;
case BLOBMSG_TYPE_INT16:
lua_pushinteger(L, be16_to_cpu(*(uint16_t *)data));
break;
case BLOBMSG_TYPE_INT32:
lua_pushinteger(L, be32_to_cpu(*(uint32_t *)data));
break;
case BLOBMSG_TYPE_INT64:
/* NB: Lua cannot handle 64bit, format value as string and push that */
sprintf(buf, "%lld", (long long int) be64_to_cpu(*(uint64_t *)data));
lua_pushstring(L, buf);
break;
case BLOBMSG_TYPE_STRING:
lua_pushstring(L, data);
break;
case BLOBMSG_TYPE_ARRAY:
ubus_lua_parse_blob_array(L, data, len, false);
break;
case BLOBMSG_TYPE_TABLE:
ubus_lua_parse_blob_array(L, data, len, true);
break;
default:
lua_pushnil(L);
break;
}
return off + 1;
}
static bool
ubus_lua_format_blob_is_array(lua_State *L)
{
lua_Integer prv = 0;
lua_Integer cur = 0;
/* Find out whether table is array-like */
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1))
{
if (lua_type(L, -2) != LUA_TNUMBER && lua_type(L, -2) != LUA_TINT)
{
lua_pop(L, 1);
return false;
}
cur = lua_tointeger(L, -2);
if ((cur - 1) != prv)
{
lua_pop(L, 1);
return false;
}
prv = cur;
}
return true;
}
static int
ubus_lua_format_blob_array(lua_State *L, struct blob_buf *b, bool table);
static int
ubus_lua_format_blob(lua_State *L, struct blob_buf *b, bool table)
{
void *c;
bool rv = true;
const char *key = table ? lua_tostring(L, -2) : NULL;
switch (lua_type(L, -1))
{
case LUA_TBOOLEAN:
blobmsg_add_u8(b, key, (uint8_t)lua_toboolean(L, -1));
break;
case LUA_TINT:
case LUA_TNUMBER:
blobmsg_add_u32(b, key, (uint32_t)lua_tointeger(L, -1));
break;
case LUA_TSTRING:
case LUA_TUSERDATA:
case LUA_TLIGHTUSERDATA:
blobmsg_add_string(b, key, lua_tostring(L, -1));
break;
case LUA_TTABLE:
if (ubus_lua_format_blob_is_array(L))
{
c = blobmsg_open_array(b, key);
rv = ubus_lua_format_blob_array(L, b, false);
blobmsg_close_array(b, c);
}
else
{
c = blobmsg_open_table(b, key);
rv = ubus_lua_format_blob_array(L, b, true);
blobmsg_close_table(b, c);
}
break;
default:
rv = false;
break;
}
return rv;
}
static int
ubus_lua_format_blob_array(lua_State *L, struct blob_buf *b, bool table)
{
for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1))
{
if (!ubus_lua_format_blob(L, b, table))
{
lua_pop(L, 1);
return false;
}
}
return true;
}
static int
ubus_lua_connect(lua_State *L)
{
struct ubus_lua_connection *c;
const char *sockpath = luaL_optstring(L, 1, NULL);
int timeout = luaL_optint(L, 2, 30);
if ((c = lua_newuserdata(L, sizeof(*c))) != NULL &&
(c->ctx = ubus_connect(sockpath)) != NULL)
{
c->timeout = timeout;
memset(&c->buf, 0, sizeof(c->buf));
luaL_getmetatable(L, METANAME);
lua_setmetatable(L, -2);
return 1;
}
/* NB: no errors from ubus_connect() yet */
lua_pushnil(L);
lua_pushinteger(L, UBUS_STATUS_UNKNOWN_ERROR);
return 2;
}
static void
ubus_lua_objects_cb(struct ubus_context *c, struct ubus_object_data *o, void *p)
{
lua_State *L = (lua_State *)p;
lua_pushstring(L, o->path);
lua_rawseti(L, -2, lua_objlen(L, -2) + 1);
}
static int
ubus_lua_objects(lua_State *L)
{
int rv;
struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
lua_newtable(L);
rv = ubus_lookup(c->ctx, NULL, ubus_lua_objects_cb, L);
if (rv != UBUS_STATUS_OK)
{
lua_pop(L, 1);
lua_pushnil(L);
lua_pushinteger(L, rv);
return 2;
}
return 1;
}
static void
ubus_lua_signatures_cb(struct ubus_context *c, struct ubus_object_data *o, void *p)
{
lua_State *L = (lua_State *)p;
if (!o->signature)
return;
ubus_lua_parse_blob_array(L, blob_data(o->signature), blob_len(o->signature), true);
}
static int
ubus_lua_signatures(lua_State *L)
{
int rv;
struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
const char *path = luaL_checkstring(L, 2);
rv = ubus_lookup(c->ctx, path, ubus_lua_signatures_cb, L);
if (rv != UBUS_STATUS_OK)
{
lua_pop(L, 1);
lua_pushnil(L);
lua_pushinteger(L, rv);
return 2;
}
return 1;
}
static void
ubus_lua_call_cb(struct ubus_request *req, int type, struct blob_attr *msg)
{
lua_State *L = (lua_State *)req->priv;
if (!msg)
lua_pushnil(L);
ubus_lua_parse_blob_array(L, blob_data(msg), blob_len(msg), true);
}
static int
ubus_lua_call(lua_State *L)
{
int rv;
uint32_t id;
struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
const char *path = luaL_checkstring(L, 2);
const char *func = luaL_checkstring(L, 3);
luaL_checktype(L, 4, 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;
}
rv = ubus_lookup_id(c->ctx, path, &id);
if (rv)
{
lua_pushnil(L);
lua_pushinteger(L, rv);
return 2;
}
rv = ubus_invoke(c->ctx, id, func, c->buf.head, ubus_lua_call_cb, L, c->timeout * 1000);
if (rv != UBUS_STATUS_OK)
{
lua_pop(L, 1);
lua_pushnil(L);
lua_pushinteger(L, rv);
return 2;
}
return 1;
}
static int
ubus_lua__gc(lua_State *L)
{
struct ubus_lua_connection *c = luaL_checkudata(L, 1, METANAME);
if (c->ctx != NULL)
{
ubus_free(c->ctx);
memset(c, 0, sizeof(*c));
}
return 0;
}
static const luaL_Reg ubus[] = {
{ "connect", ubus_lua_connect },
{ "objects", ubus_lua_objects },
{ "signatures", ubus_lua_signatures },
{ "call", ubus_lua_call },
{ "close", ubus_lua__gc },
{ "__gc", ubus_lua__gc },
{ NULL, NULL },
};
int
luaopen_ubus(lua_State *L)
{
/* create metatable */
luaL_newmetatable(L, METANAME);
/* metatable.__index = metatable */
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
/* fill metatable */
luaL_register(L, NULL, ubus);
lua_pop(L, 1);
/* create module */
luaL_register(L, MODNAME, ubus);
return 0;
}