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use UnixDatagram;
use futures::{Async, Future, Poll};
use std::io;
use std::mem;
use std::path::Path;
#[derive(Debug)]
pub struct SendDgram<T, P> {
st: State<T, P>,
}
#[derive(Debug)]
enum State<T, P> {
Sending {
sock: UnixDatagram,
buf: T,
addr: P,
},
Empty,
}
impl<T, P> SendDgram<T, P>
where
T: AsRef<[u8]>,
P: AsRef<Path>,
{
pub(crate) fn new(sock: UnixDatagram, buf: T, addr: P) -> SendDgram<T, P> {
SendDgram {
st: State::Sending {
sock,
buf,
addr,
}
}
}
}
impl<T, P> Future for SendDgram<T, P>
where
T: AsRef<[u8]>,
P: AsRef<Path>,
{
type Item = (UnixDatagram, T);
type Error = io::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
if let State::Sending {
ref mut sock,
ref buf,
ref addr,
} = self.st
{
let n = try_ready!(sock.poll_send_to(buf.as_ref(), addr));
if n < buf.as_ref().len() {
return Err(io::Error::new(
io::ErrorKind::Other,
"Couldn't send whole buffer".to_string(),
));
}
} else {
panic!()
}
if let State::Sending { sock, buf, addr: _ } =
mem::replace(&mut self.st, State::Empty)
{
Ok(Async::Ready((sock, buf)))
} else {
panic!()
}
}
}