tdengine 0.1.2

game server for Rust
Documentation 
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use std::collections::HashSet;
use std::net::{TcpListener, TcpStream};
use std::mem;
use std::io::Read;

use net2;
use td_revent::*;

use {EventMgr, SocketEvent};
pub struct ServiceMgr {
    listen_fds: HashSet<i32>,
}

static mut el: *mut ServiceMgr = 0 as *mut _;
impl ServiceMgr {
    pub fn instance() -> &'static mut ServiceMgr {
        unsafe {
            if el == 0 as *mut _ {
                el = Box::into_raw(Box::new(ServiceMgr::new()));
            }
            &mut *el
        }
    }

    pub fn new() -> ServiceMgr {
        ServiceMgr { listen_fds: HashSet::new() }
    }


    pub fn read_write_callback(ev: &mut EventLoop,
                               fd: u32,
                               flag: EventFlags,
                               data: *mut ())
                               -> i32 {
        if flag.contains(FLAG_READ) {
            Self::read_callback(ev, fd, flag, data);
        } 

        if flag.contains(FLAG_WRITE) {
            Self::write_callback(ev, fd, flag, data);
        }
        0
    }

    fn read_callback(_ev: &mut EventLoop, fd: u32, _: EventFlags, _: *mut ()) -> i32 {
        let mut tcp = TcpStream::from_fd(fd as i32);
        let mut buffer = [0; 1024];
        let size = match tcp.read(&mut buffer) {
            Ok(size) => {
                if size == 0 {
                    println!("read fd = {:?} size = 0", fd);
                    EventMgr::instance().add_kick_event(fd as i32);
                    mem::forget(tcp);
                    return 0;
                }
                size
            }
            Err(err) => {
                println!("read fd = {:?} err = {:?}", fd, err);
                EventMgr::instance().add_kick_event(fd as i32);
                mem::forget(tcp);
                return 0;
            }
        };
        EventMgr::instance().data_recieved(fd as i32, &buffer[..size]);
        mem::forget(tcp);
        0
    }

    fn write_callback(ev: &mut EventLoop, fd: u32, flag: EventFlags, data: *mut ()) -> i32 {
        EventMgr::write_callback(ev, fd, flag, data);
        0
    }

    fn accept_callback(ev: &mut EventLoop, fd: u32, _: EventFlags, _: *mut ()) -> i32 {
        let listener = TcpListener::from_fd(fd as i32);
        let (stream, addr) = unwrap_or!(listener.accept().ok(), return 0);
        let local_addr = listener.local_addr().unwrap();
        let event = SocketEvent::new(stream.as_fd(), format!("{}", addr), local_addr.port());
        EventMgr::instance().new_socket_event(event);
        net2::TcpStreamExt::set_nonblocking(&stream, true).ok().unwrap();
        ev.add_event(EventEntry::new(stream.as_fd() as u32,
                                     FLAG_READ | FLAG_PERSIST,
                                     Some(ServiceMgr::read_write_callback),
                                     None));
        mem::forget(listener);
        mem::forget(stream);
        0
    }

    pub fn start_listener(&mut self, bind_ip: String, bind_port: u16) {
        let listener = TcpListener::bind(&format!("{}:{}", bind_ip, bind_port)[..]).unwrap();
        let fd = listener.as_fd();
        let event_loop = EventMgr::instance().get_event_loop();
        event_loop.add_event(EventEntry::new(listener.as_fd() as u32,
                                             FLAG_READ | FLAG_PERSIST,
                                             Some(ServiceMgr::accept_callback),
                                             None));
        self.listen_fds.insert(fd);
        mem::forget(listener);
    }

    pub fn stop_listener(&mut self) {
        let event_loop = EventMgr::instance().get_event_loop();
        for fd in &self.listen_fds {
            event_loop.del_event(*fd as u32, EventFlags::all());
        }
        self.listen_fds.clear();
    }
}