cached_to_socket.rs

#[inline]
pub fn api_url() -> io::Result<RwLockReadGuard<'static, Option<SocketAddr>>> {
    lazy_static! {
        static ref API_ADDR: RwLock<Option<SocketAddr>> = RwLock::new(None);
    }

    loop {
        match API_ADDR.read() {
            Ok(read_lock) => match read_lock.as_ref() {
                Some(_) => return Ok(read_lock),
                None => ()
            },
            Err(_) => panic!("VNDB: api_url(): Poisoned RwLock")
        }

        match API_URL.to_socket_addrs() {
            Ok(mut iter) => match iter.next() {
                Some(addr) => {
                    let mut write_lock = API_ADDR.write().expect("VNDB: api_url(): Poisoned RwLock");
                    *write_lock = Some(addr);
                },
                None => return Err(io::Error::new(io::ErrorKind::AddrNotAvailable, "DNS query api.vndb.org returns nothing"))
            },
            Err(error) => return Err(io::Error::new(io::ErrorKind::AddrNotAvailable, error))
        }
    }
}