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use std::io;
use std::mem;
use futures::{Future, Poll};
use AsyncRead;
#[derive(Debug)]
pub struct ReadToEnd<A> {
state: State<A>,
}
#[derive(Debug)]
enum State<A> {
Reading { a: A, buf: Vec<u8> },
Empty,
}
pub fn read_to_end<A>(a: A, buf: Vec<u8>) -> ReadToEnd<A>
where
A: AsyncRead,
{
ReadToEnd {
state: State::Reading { a: a, buf: buf },
}
}
impl<A> Future for ReadToEnd<A>
where
A: AsyncRead,
{
type Item = (A, Vec<u8>);
type Error = io::Error;
fn poll(&mut self) -> Poll<(A, Vec<u8>), io::Error> {
match self.state {
State::Reading {
ref mut a,
ref mut buf,
} => {
try_nb!(a.read_to_end(buf));
}
State::Empty => panic!("poll ReadToEnd after it's done"),
}
match mem::replace(&mut self.state, State::Empty) {
State::Reading { a, buf } => Ok((a, buf).into()),
State::Empty => unreachable!(),
}
}
}