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/*
* Copyright 2014 The Luvit Authors. All Rights Reserved.
*
* 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 "lreq.h"
static int luv_check_continuation(lua_State* L, int index) {
if (lua_isnoneornil(L, index)) return LUA_NOREF;
luaL_checktype(L, index, LUA_TFUNCTION);
lua_pushvalue(L, index);
return luaL_ref(L, LUA_REGISTRYINDEX);
}
// Store a lua callback in a luv_req for the continuation.
// The uv_req_t is assumed to be at the top of the stack
static luv_req_t* luv_setup_req(lua_State* L, int callback_ref) {
luv_req_t* data;
luaL_checktype(L, -1, LUA_TUSERDATA);
data = malloc(sizeof(*data));
if (!data) luaL_error(L, "Problem allocating luv request");
luaL_getmetatable(L, "uv_req");
lua_setmetatable(L, -2);
lua_pushvalue(L, -1);
data->req_ref = luaL_ref(L, LUA_REGISTRYINDEX);
data->callback_ref = callback_ref;
data->data_ref = LUA_NOREF;
data->data = NULL;
return data;
}
static void luv_fulfill_req(lua_State* L, luv_req_t* data, int nargs) {
if (data->callback_ref == LUA_NOREF) {
lua_pop(L, nargs);
}
else {
// Get the callback
lua_rawgeti(L, LUA_REGISTRYINDEX, data->callback_ref);
// And insert it before the args if there are any.
if (nargs) {
lua_insert(L, -1 - nargs);
}
lua_call(L, nargs, 0);
}
}
static void luv_cleanup_req(lua_State* L, luv_req_t* data) {
luaL_unref(L, LUA_REGISTRYINDEX, data->req_ref);
luaL_unref(L, LUA_REGISTRYINDEX, data->callback_ref);
luaL_unref(L, LUA_REGISTRYINDEX, data->data_ref);
free(data->data);
free(data);
}
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