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/* LuaEvent - Copyright (C) 2007 Thomas Harning <harningt@gmail.com>
* Licensed as LGPL - See doc/COPYING for details */
#include "luaevent.h"
#include <lua.h>
#include <lauxlib.h>
#define EVENT_BASE_MT "EVENT_BASE_MT"
#define EVENT_CALLBACK_ARG_MT "EVENT_CALLBACK_ARG_MT"
#define EVENT_BASE_LOCATION 1
void setEventBase(lua_State* L, struct event_base* base) {
struct event_base** pbase = lua_newuserdata(L, sizeof(base));
*pbase = base;
luaL_getmetatable(L, EVENT_BASE_MT);
lua_setmetatable(L, -2);
lua_rawseti(L, LUA_ENVIRONINDEX, EVENT_BASE_LOCATION);
}
struct event_base* getEventBase(lua_State* L) {
struct event_base* base;
lua_rawgeti(L, LUA_ENVIRONINDEX, EVENT_BASE_LOCATION);
base = *(struct event_base**)lua_topointer(L, -1);
lua_pop(L, 1);
return base;
}
void freeCallbackArgs(le_callback* arg) {
if(arg->L) {
lua_State* L = arg->L;
arg->L = NULL;
event_del(&arg->ev);
luaL_unref(L, LUA_REGISTRYINDEX, arg->callbackRef);
}
}
/* le_callback is allocated at the beginning of the coroutine in which it
is used, no need to manually de-allocate */
/* Index for coroutine is fd as integer for *nix, as lightuserdata for Win */
static void luaevent_callback(int fd, short event, void* p) {
le_callback* arg = p;
lua_State* L = arg->L;
int ret;
lua_rawgeti(L, LUA_REGISTRYINDEX, arg->callbackRef);
lua_pushinteger(L, event);
lua_call(L, 1, 1);
ret = lua_tointeger(L, -1);
lua_pop(L, 1);
if(ret == -1) {
freeCallbackArgs(arg);
} else {
struct event *ev = &arg->ev;
int newEvent = ret;
if(newEvent != event) { // Need to hook up new event...
event_del(ev);
event_set(ev, fd, EV_PERSIST | newEvent, luaevent_callback, arg);
event_add(ev, NULL);
}
}
}
static int luaevent_base_gc(lua_State* L) {
struct event_base** pbase = luaL_checkudata(L, 1, EVENT_BASE_MT);
if(*pbase) {
event_base_free(*pbase);
*pbase = NULL;
}
return 0;
}
static int luaevent_cb_gc(lua_State* L) {
le_callback* arg = luaL_checkudata(L, 1, EVENT_CALLBACK_ARG_MT);
freeCallbackArgs(arg);
return 0;
}
int getSocketFd(lua_State* L, int idx) {
int fd;
luaL_checktype(L, idx, LUA_TUSERDATA);
lua_getfield(L, idx, "getfd");
if(lua_isnil(L, -1))
return luaL_error(L, "Socket type missing 'getfd' method");
lua_pushvalue(L, idx);
lua_call(L, 1, 1);
fd = lua_tointeger(L, -1);
lua_pop(L, 1);
return fd;
}
/* Expected to be called at the beginning of the coro that uses it..
Value must be kept until coro is complete....
*/
/* sock, event, callback */
static int luaevent_addevent(lua_State* L) {
int fd, event, callbackRef;
le_callback* arg;
fd = getSocketFd(L, 1);
event = luaL_checkinteger(L, 2);
luaL_checktype(L, 3, LUA_TFUNCTION);
lua_pushvalue(L, 3);
callbackRef = luaL_ref(L, LUA_REGISTRYINDEX);
arg = lua_newuserdata(L, sizeof(*arg));
luaL_getmetatable(L, EVENT_CALLBACK_ARG_MT);
lua_setmetatable(L, -2);
arg->L = L;
arg->callbackRef = callbackRef;
/* Setup event... */
event_set(&arg->ev, fd, event | EV_PERSIST, luaevent_callback, arg);
event_base_set(getEventBase(L), &arg->ev);
event_add(&arg->ev, NULL);
return 1;
}
static int luaevent_loop(lua_State* L) {
int ret = event_base_loop(getEventBase(L), 0);
lua_pushinteger(L, ret);
return 1;
}
static luaL_Reg funcs[] = {
{ "addevent", luaevent_addevent },
{ "loop", luaevent_loop },
{ NULL, NULL }
};
typedef struct {
const char* name;
int value;
} namedInteger;
static namedInteger consts[] = {
{"LEAVE", -1},
{"EV_READ", EV_READ},
{"EV_WRITE", EV_WRITE},
{NULL, 0}
};
void setNamedIntegers(lua_State* L, namedInteger* p) {
while(p->name) {
lua_pushinteger(L, p->value);
lua_setfield(L, -2, p->name);
p++;
}
}
/* Verified ok */
int luaopen_luaevent_core(lua_State* L) {
/* Setup environ table */
lua_createtable(L, 1, 0);
lua_replace(L, LUA_ENVIRONINDEX);
/* Setup metatable */
luaL_newmetatable(L, EVENT_BASE_MT);
lua_pushcfunction(L, luaevent_base_gc);
lua_setfield(L, -2, "__gc");
lua_pop(L, 1);
luaL_newmetatable(L, EVENT_CALLBACK_ARG_MT);
lua_pushcfunction(L, luaevent_cb_gc);
lua_setfield(L, -2, "__gc");
lua_pop(L, 1);
setEventBase(L, event_init());
luaL_register(L, "luaevent.core", funcs);
setNamedIntegers(L, consts);
return 1;
}
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