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// this is a hack around the fact that tokio::io::stdin() is actually
// blocking, which makes it useless for interactive programs. this isn't great
// (or particularly correct) but it mostly works.
use std::io::Read as _;
struct EventedStdin;
const STDIN: i32 = 0;
impl std::io::Read for EventedStdin {
fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
let stdin = std::io::stdin();
let mut stdin = stdin.lock();
stdin.read(buf)
}
}
impl mio::Evented for EventedStdin {
fn register(
&self,
poll: &mio::Poll,
token: mio::Token,
interest: mio::Ready,
opts: mio::PollOpt,
) -> std::io::Result<()> {
let fd = STDIN as std::os::unix::io::RawFd;
let eventedfd = mio::unix::EventedFd(&fd);
eventedfd.register(poll, token, interest, opts)
}
fn reregister(
&self,
poll: &mio::Poll,
token: mio::Token,
interest: mio::Ready,
opts: mio::PollOpt,
) -> std::io::Result<()> {
let fd = STDIN as std::os::unix::io::RawFd;
let eventedfd = mio::unix::EventedFd(&fd);
eventedfd.reregister(poll, token, interest, opts)
}
fn deregister(&self, poll: &mio::Poll) -> std::io::Result<()> {
let fd = STDIN as std::os::unix::io::RawFd;
let eventedfd = mio::unix::EventedFd(&fd);
eventedfd.deregister(poll)
}
}
pub struct Stdin {
input: tokio::reactor::PollEvented2<EventedStdin>,
}
#[allow(dead_code)]
impl Stdin {
pub fn new() -> Self {
Default::default()
}
}
impl Default for Stdin {
fn default() -> Self {
Self {
input: tokio::reactor::PollEvented2::new(EventedStdin),
}
}
}
impl std::io::Read for Stdin {
fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
self.input.read(buf)
}
}
impl tokio::io::AsyncRead for Stdin {
fn poll_read(
&mut self,
buf: &mut [u8],
) -> std::result::Result<futures::Async<usize>, tokio::io::Error> {
let ready = mio::Ready::readable();
futures::try_ready!(self.input.poll_read_ready(ready));
let res = self.read(buf)?;
self.input.clear_read_ready(ready)?;
Ok(futures::Async::Ready(res))
}
}
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