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utils.c
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utils.c
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/*
* Copyright 2012 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 <stdlib.h>
#include <string.h>
#include <assert.h>
#include "utils.h"
/* Meant as a lua_call replace for use in async callbacks
* Uses the main loop and event source
*/
void luv_acall(lua_State *C, int nargs, int nresults, const char* source) {
lua_State* L;
/* Get the main thread without cheating */
lua_getfield(C, LUA_REGISTRYINDEX, "main_thread");
L = lua_tothread(C, -1);
lua_pop(C, 1);
/* If C is not main then move to main */
if (C != L) {
lua_getglobal(L, "eventSource");
lua_pushstring(L, source);
lua_xmove (C, L, nargs + 1);
lua_call(L, nargs + 2, nresults);
} else {
/* Wrap the call with the eventSource function */
int offset = nargs + 2;
lua_getglobal(L, "eventSource");
lua_insert(L, -offset);
lua_pushstring(L, source);
lua_insert(L, -offset);
lua_call(L, nargs + 2, nresults);
}
}
/* Pushes an error object onto the stack */
void luv_push_async_error_raw(lua_State* L, const char *code, const char *msg, const char* source, const char* path) {
lua_newtable(L);
lua_getglobal(L, "errorMeta");
lua_setmetatable(L, -2);
if (path) {
lua_pushstring(L, path);
lua_setfield(L, -2, "path");
lua_pushfstring(L, "%s, %s '%s'", code, msg, path);
} else {
lua_pushfstring(L, "%s, %s", code, msg);
}
lua_setfield(L, -2, "message");
lua_pushstring(L, code);
lua_setfield(L, -2, "code");
lua_pushstring(L, source);
lua_setfield(L, -2, "source");
}
/* Pushes an error object onto the stack */
void luv_push_async_error(lua_State* L, uv_err_t err, const char* source, const char* path) {
const char* code = uv_err_name(err);
const char* msg = uv_strerror(err);
luv_push_async_error_raw(L, code, msg, source, path);
}
uv_handle_t* luv_checkudata(lua_State* L, int index, const char* type) {
/* Check for table wrappers as well and replace it with the userdata it points to */
if (lua_istable (L, index)) {
lua_getfield(L, index, "userdata");
lua_replace(L, index);
}
luaL_checktype(L, index, LUA_TUSERDATA);
return ((luv_handle_t*)lua_touserdata(L, index))->handle;
}
const char* luv_handle_type_to_string(uv_handle_type type) {
switch (type) {
case UV_TCP: return "TCP";
case UV_UDP: return "UDP";
case UV_NAMED_PIPE: return "NAMED_PIPE";
case UV_TTY: return "TTY";
case UV_FILE: return "FILE";
case UV_TIMER: return "TIMER";
case UV_PREPARE: return "PREPARE";
case UV_CHECK: return "CHECK";
case UV_IDLE: return "IDLE";
case UV_ASYNC: return "ASYNC";
case UV_ARES_TASK: return "ARES_TASK";
case UV_ARES_EVENT: return "ARES_EVENT";
case UV_PROCESS: return "PROCESS";
case UV_FS_EVENT: return "FS_EVENT";
default: return "UNKNOWN_HANDLE";
}
}
void luv_set_loop(lua_State *L, uv_loop_t *loop) {
lua_pushlightuserdata(L, loop);
lua_setfield(L, LUA_REGISTRYINDEX, "loop");
}
uv_loop_t* luv_get_loop(lua_State *L) {
uv_loop_t *loop;
lua_getfield(L, LUA_REGISTRYINDEX, "loop");
loop = lua_touserdata(L, -1);
lua_pop(L, 1);
return loop;
}
/* Initialize a new lhandle and push the new userdata on the stack. */
luv_handle_t* luv_handle_create(lua_State* L, size_t size, const char* type) {
/* Create the userdata and set it's metatable */
luv_handle_t* lhandle = (luv_handle_t*)lua_newuserdata(L, sizeof(luv_handle_t));
/* Set metatable for type */
luaL_getmetatable(L, "luv_handle");
lua_setmetatable(L, -2);
/* Create a local environment for storing stuff */
lua_newtable(L);
lua_setfenv (L, -2);
/* Initialize and return the lhandle */
lhandle->handle = (uv_handle_t*)malloc(size);
lhandle->handle->data = lhandle; /* Point back to lhandle from handle */
lhandle->refCount = 0;
lhandle->L = L;
lhandle->ref = LUA_NOREF;
lhandle->type = type;
return lhandle;
}
uv_udp_t* luv_create_udp(lua_State* L) {
return (uv_udp_t*)luv_handle_create(L, sizeof(uv_udp_t), "luv_udp")->handle;
}
uv_fs_event_t* luv_create_fs_watcher(lua_State* L) {
return (uv_fs_event_t*)luv_handle_create(L, sizeof(uv_fs_event_t), "luv_fs_watcher")->handle;
}
uv_timer_t* luv_create_timer(lua_State* L) {
return (uv_timer_t*)luv_handle_create(L, sizeof(uv_timer_t), "luv_timer")->handle;
}
uv_process_t* luv_create_process(lua_State* L) {
return (uv_process_t*)luv_handle_create(L, sizeof(uv_process_t), "luv_process")->handle;
}
uv_tcp_t* luv_create_tcp(lua_State* L) {
return (uv_tcp_t*)luv_handle_create(L, sizeof(uv_tcp_t), "luv_tcp")->handle;
}
uv_pipe_t* luv_create_pipe(lua_State* L) {
return (uv_pipe_t*)luv_handle_create(L, sizeof(uv_pipe_t), "luv_pipe")->handle;
}
uv_tty_t* luv_create_tty(lua_State* L) {
return (uv_tty_t*)luv_handle_create(L, sizeof(uv_tty_t), "luv_tty")->handle;
}
/* This needs to be called when an async function is started on a lhandle. */
void luv_handle_ref(lua_State* L, luv_handle_t* lhandle, int index) {
/* printf("luv_handle_ref\t%s %p:%p\n", lhandle->type, lhandle, lhandle->handle);*/
/* If it's inactive, store a ref. */
if (!lhandle->refCount) {
lua_pushvalue(L, index);
lhandle->ref = luaL_ref(L, LUA_REGISTRYINDEX);
/* printf("makeStrong\t%s lhandle=%p handle=%p\n", lhandle->type, lhandle, lhandle->handle);*/
}
lhandle->refCount++;
}
/* This needs to be called when an async callback fires on a lhandle. */
void luv_handle_unref(lua_State* L, luv_handle_t* lhandle) {
/* printf("luv_handle_unref\t%s %p:%p\n", lhandle->type, lhandle, lhandle->handle);*/
lhandle->refCount--;
assert(lhandle->refCount >= 0);
/* If it's now inactive, clear the ref */
if (!lhandle->refCount) {
luaL_unref(L, LUA_REGISTRYINDEX, lhandle->ref);
lhandle->ref = LUA_NOREF;
/* printf("makeWeak\t%s lhandle=%p handle=%p\n", lhandle->type, lhandle, lhandle->handle);*/
}
}
/* extract the lua_State* and push the userdata on the stack */
lua_State* luv_handle_get_lua(luv_handle_t* lhandle) {
/* printf("luv_handle_get_lua\t%s %p:%p\n", lhandle->type, lhandle, lhandle->handle);*/
assert(lhandle->refCount); /* sanity check */
assert(lhandle->ref != LUA_NOREF); /* the ref should be there */
lua_rawgeti(lhandle->L, LUA_REGISTRYINDEX, lhandle->ref);
return lhandle->L;
}
void luv_set_ares_channel(lua_State *L, ares_channel channel) {
lua_pushlightuserdata(L, channel);
lua_setfield(L, LUA_REGISTRYINDEX, "ares_channel");
}
ares_channel luv_get_ares_channel(lua_State *L) {
ares_channel channel;
lua_getfield(L, LUA_REGISTRYINDEX, "ares_channel");
channel = lua_touserdata(L, -1);
lua_pop(L, 1);
return channel;
}