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|
use futures::future::Future;
use std::io::{Read, Write};
use tokio::io::AsyncRead;
use tokio_pty_process::CommandExt;
#[derive(Debug)]
pub enum Error {
IOError(std::io::Error),
}
pub fn spawn(line: &str) -> Result<RunningProcess, Error> {
RunningProcess::new(line)
}
pub enum ProcessEvent {
Output(Vec<u8>),
Exit(std::process::ExitStatus),
}
pub struct RunningProcess {
pty: tokio_pty_process::AsyncPtyMaster,
process: tokio_pty_process::Child,
// TODO: tokio::io::Stdin is broken
// input: tokio::io::Stdin,
input: tokio::reactor::PollEvented2<EventedStdin>,
buf: Vec<u8>,
output_done: bool,
exit_done: bool,
_screen: crossterm::RawScreen,
}
impl RunningProcess {
fn new(line: &str) -> Result<Self, Error> {
let pty = tokio_pty_process::AsyncPtyMaster::open()
.map_err(|e| Error::IOError(e))?;
let mut argv: Vec<_> = line.split(' ').collect();
let cmd = argv.remove(0);
let process = std::process::Command::new(cmd)
.args(&argv)
.spawn_pty_async(&pty)
.map_err(|e| Error::IOError(e))?;
// TODO: tokio::io::stdin is broken (it's blocking)
// let input = tokio::io::stdin();
let input = tokio::reactor::PollEvented2::new(EventedStdin);
Ok(RunningProcess {
pty,
process,
input,
buf: Vec::with_capacity(4096),
output_done: false,
exit_done: false,
_screen: crossterm::RawScreen::into_raw_mode().unwrap(),
})
}
}
#[must_use = "streams do nothing unless polled"]
impl futures::stream::Stream for RunningProcess {
type Item = ProcessEvent;
type Error = Error;
fn poll(&mut self) -> futures::Poll<Option<Self::Item>, Self::Error> {
let ready = mio::Ready::readable();
let input_poll = self.input.poll_read_ready(ready);
match input_poll {
Ok(futures::Async::Ready(_)) => {
let stdin = std::io::stdin();
let mut stdin = stdin.lock();
let mut buf = vec![0; 4096];
// TODO: async
match stdin.read(&mut buf) {
Ok(n) => {
if n > 0 {
let bytes = buf[..n].to_vec();
// TODO: async
let res = self.pty.write_all(&bytes);
if let Err(e) = res {
return Err(Error::IOError(e));
}
}
}
Err(e) => {
return Err(Error::IOError(e));
}
}
}
_ => {}
}
// TODO: this could lose pending bytes if there is stuff to read in
// the buffer but we don't read it all in the previous read call,
// since i think we won't get another notification until new bytes
// actually arrive even if there are bytes in the buffer
if let Err(e) = self.input.clear_read_ready(ready) {
return Err(Error::IOError(e));
}
if !self.output_done {
self.buf.clear();
let output_poll = self
.pty
.read_buf(&mut self.buf)
.map_err(|e| Error::IOError(e));
match output_poll {
Ok(futures::Async::Ready(n)) => {
let bytes = self.buf[..n].to_vec();
let bytes: Vec<_> = bytes
.iter()
// replace \n with \r\n
.fold(vec![], |mut acc, &c| {
if c == b'\n' {
acc.push(b'\r');
acc.push(b'\n');
} else {
acc.push(c);
}
acc
});
return Ok(futures::Async::Ready(Some(
ProcessEvent::Output(bytes),
)));
}
Ok(futures::Async::NotReady) => {
return Ok(futures::Async::NotReady);
}
Err(_) => {
self.output_done = true;
}
}
}
if !self.exit_done {
let exit_poll =
self.process.poll().map_err(|e| Error::IOError(e));
match exit_poll {
Ok(futures::Async::Ready(status)) => {
self.exit_done = true;
return Ok(futures::Async::Ready(Some(
ProcessEvent::Exit(status),
)));
}
Ok(futures::Async::NotReady) => {
return Ok(futures::Async::NotReady);
}
Err(e) => {
return Err(e);
}
}
}
Ok(futures::Async::Ready(None))
}
}
struct EventedStdin;
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 = 0 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 = 0 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 = 0 as std::os::unix::io::RawFd;
let eventedfd = mio::unix::EventedFd(&fd);
eventedfd.deregister(poll)
}
}
|
