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/* LuaEvent - Copyright (C) 2007 Thomas Harning <harningt@gmail.com>
* Licensed as LGPL - See doc/COPYING for details */
#include "buffer_event.h"
#include "luaevent.h"
#include "utility.h"
#include <lauxlib.h>
#include <malloc.h>
#include "event_buffer.h"
#define BUFFER_EVENT_MT "BUFFER_EVENT_MT"
/* Locations of READ/WRITE buffers in the fenv */
#define READ_BUFFER_LOCATION 4
#define WRITE_BUFFER_LOCATION 5
/* Obtains an le_bufferevent structure from a given index */
static le_bufferevent* buffer_event_get(lua_State* L, int idx) {
return (le_bufferevent*)luaL_checkudata(L, idx, BUFFER_EVENT_MT);
}
/* Obtains an le_bufferevent structure from a given index
AND checks that it hadn't been prematurely freed
*/
le_bufferevent* buffer_event_check(lua_State* L, int idx) {
le_bufferevent* buf = (le_bufferevent*)luaL_checkudata(L, idx, BUFFER_EVENT_MT);
if(!buf->ev)
luaL_argerror(L, idx, "Attempt to use closed buffer_event object");
return buf;
}
/* Checks if the given index contains an le_buffer object */
int is_buffer_event(lua_State* L, int idx) {
int ret;
lua_getmetatable(L, idx);
luaL_getmetatable(L, BUFFER_EVENT_MT);
ret = lua_rawequal(L, -2, -1);
lua_pop(L, 2);
return ret;
}
static void handle_callback(le_bufferevent* le_ev, short what, int callbackIndex) {
lua_State* L = le_ev->base->loop_L;
le_weak_get(L, le_ev);
lua_getfenv(L, -1);
lua_rawgeti(L, -1, callbackIndex);
lua_remove(L, -2);
lua_pushvalue(L, -2);
lua_remove(L, -3);
/* func, bufferevent */
lua_pushinteger(L, what);
/* What to do w/ errors...? */
lua_pcall(L, 3, 0, 0);
}
static void buffer_event_readcb(struct bufferevent *ev, void *ptr) {
handle_callback((le_bufferevent*)ptr, EVBUFFER_READ, 1);
}
static void buffer_event_writecb(struct bufferevent *ev, void *ptr) {
handle_callback((le_bufferevent*)ptr, EVBUFFER_WRITE, 2);
}
static void buffer_event_errorcb(struct bufferevent *ev, short what, void *ptr) {
handle_callback((le_bufferevent*)ptr, what, 3);
}
/* LUA: new(fd, read, write, error)
Pushes a new bufferevent instance on the stack
Accepts: base, fd, read, write, error cb
Requires base, fd and error cb
*/
static int buffer_event_push(lua_State* L) {
le_bufferevent *ev;
le_base* base = event_base_get(L, 1);
/* NOTE: Should probably reference the socket as well... */
int fd = getSocketFd(L, 2);
luaL_checktype(L, 5, LUA_TFUNCTION);
if(!lua_isnil(L, 3)) luaL_checktype(L, 3, LUA_TFUNCTION);
if(!lua_isnil(L, 4)) luaL_checktype(L, 4, LUA_TFUNCTION);
ev= (le_bufferevent*)lua_newuserdata(L, sizeof(le_bufferevent));
luaL_getmetatable(L, BUFFER_EVENT_MT);
lua_setmetatable(L, -2);
ev->ev = bufferevent_new(fd, buffer_event_readcb, buffer_event_writecb, buffer_event_errorcb, ev);
lua_createtable(L, 5, 0);
lua_pushvalue(L, 3);
lua_rawseti(L, -2, 1); // Read
lua_pushvalue(L, 4);
lua_rawseti(L, -2, 2); // Write
lua_pushvalue(L, 5);
lua_rawseti(L, -2, 3); // Err
event_buffer_push(L, ev->ev->input);
lua_rawseti(L, -2, READ_BUFFER_LOCATION);
event_buffer_push(L, ev->ev->output);
lua_rawseti(L, -2, WRITE_BUFFER_LOCATION);
lua_setfenv(L, -2);
ev->base = base;
return 1;
}
/* LUA: __gc and buffer:close()
Releases the buffer resources
*/
static int buffer_event_gc(lua_State* L) {
le_bufferevent* ev = buffer_event_get(L, 1);
if(ev->ev) {
le_buffer *read, *write;
bufferevent_free(ev->ev);
ev->ev = NULL;
/* Also clear out the associated input/output event_buffers
* since they would have already been freed.. */
lua_getfenv(L, 1);
lua_rawgeti(L, -1, READ_BUFFER_LOCATION);
lua_rawgeti(L, -2, WRITE_BUFFER_LOCATION);
read = event_buffer_check(L, -2);
write = event_buffer_check(L, -1);
/* Erase Lua's link to the buffers */
lua_pushnil(L);
/* LS: ..., fenv, readBuf, writeBuf, nil */
lua_rawseti(L, -4, READ_BUFFER_LOCATION);
lua_pushnil(L);
lua_rawseti(L, -4, WRITE_BUFFER_LOCATION);
/* Erase their knowledge of the buffer so that the GC won't try to double-free */
read->buffer = NULL;
write->buffer = NULL;
}
return 0;
}
static int buffer_event_get_read(lua_State* L) {
(void)buffer_event_get(L, 1);
lua_getfenv(L, 1);
lua_rawgeti(L, -1, READ_BUFFER_LOCATION);
return 1;
}
static int buffer_event_get_write(lua_State* L) {
(void)buffer_event_get(L, 1);
lua_getfenv(L, 1);
lua_rawgeti(L, -1, WRITE_BUFFER_LOCATION);
return 1;
}
static luaL_Reg buffer_event_funcs[] = {
{"get_read", buffer_event_get_read},
{"get_write", buffer_event_get_write},
{NULL, NULL}
};
static luaL_Reg funcs[] = {
{"new", buffer_event_push},
{NULL, NULL}
};
int buffer_event_register(lua_State* L) {
luaL_newmetatable(L, BUFFER_EVENT_MT);
lua_pushcfunction(L, buffer_event_gc);
lua_setfield(L, -2, "__gc");
lua_newtable(L);
luaL_register(L, NULL, buffer_event_funcs);
lua_setfield(L, -2, "__index");
lua_pop(L, 1);
luaL_register(L, "luaevent.core.bufferevent", funcs);
return 1;
}
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