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use futures::future::Future as _;
use snafu::ResultExt as _;
use std::io::{Read as _, Write as _};
use tokio::io::AsyncRead as _;
use tokio_pty_process::CommandExt as _;
#[derive(Debug, snafu::Snafu)]
pub enum Error {
#[snafu(display("failed to open a pty: {}", source))]
OpenPty { source: std::io::Error },
#[snafu(display("failed to spawn process for `{}`: {}", cmd, source))]
SpawnProcess { cmd: String, source: std::io::Error },
#[snafu(display("failed to write to pty: {}", source))]
WriteToPty { source: std::io::Error },
#[snafu(display("failed to read from terminal: {}", source))]
ReadFromTerminal { source: std::io::Error },
#[snafu(display(
"failed to clear ready state on pty for reading: {}",
source
))]
PtyClearReadReady { source: std::io::Error },
#[snafu(display("failed to poll for process exit: {}", source))]
ProcessExitPoll { source: std::io::Error },
#[snafu(display(
"failed to put the terminal into raw mode: {}",
source
))]
IntoRawMode { source: std::io::Error },
}
pub type Result<T> = std::result::Result<T, Error>;
pub fn spawn(cmd: &str, args: &[String]) -> Result<RunningProcess> {
RunningProcess::new(cmd, args)
}
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>,
cmd: String,
args: Vec<String>,
buf: Vec<u8>,
started: bool,
output_done: bool,
exit_done: bool,
_screen: crossterm::RawScreen,
}
impl RunningProcess {
fn new(cmd: &str, args: &[String]) -> Result<Self> {
let pty =
tokio_pty_process::AsyncPtyMaster::open().context(OpenPty)?;
let process = std::process::Command::new(cmd)
.args(args)
.spawn_pty_async(&pty)
.context(SpawnProcess { cmd })?;
// TODO: tokio::io::stdin is broken (it's blocking)
// let input = tokio::io::stdin();
let input = tokio::reactor::PollEvented2::new(EventedStdin);
Ok(Self {
pty,
process,
input,
cmd: cmd.to_string(),
args: args.to_vec(),
buf: Vec::with_capacity(4096),
started: false,
output_done: false,
exit_done: false,
_screen: crossterm::RawScreen::into_raw_mode()
.context(IntoRawMode)?,
})
}
}
#[must_use = "streams do nothing unless polled"]
impl futures::stream::Stream for RunningProcess {
type Item = crate::eval::CommandEvent;
type Error = Error;
fn poll(&mut self) -> futures::Poll<Option<Self::Item>, Self::Error> {
if !self.started {
self.started = true;
return Ok(futures::Async::Ready(Some(
crate::eval::CommandEvent::CommandStart(
self.cmd.clone(),
self.args.clone(),
),
)));
}
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
let n = stdin.read(&mut buf).context(ReadFromTerminal)?;
if n > 0 {
let bytes = buf[..n].to_vec();
// TODO: async
self.pty.write_all(&bytes).context(WriteToPty)?;
}
}
_ => {}
}
// 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
self.input
.clear_read_ready(ready)
.context(PtyClearReadReady)?;
if !self.output_done {
self.buf.clear();
let output_poll = self.pty.read_buf(&mut self.buf);
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(
crate::eval::CommandEvent::Output(bytes),
)));
}
Ok(futures::Async::NotReady) => {
return Ok(futures::Async::NotReady);
}
Err(_) => {
// explicitly ignoring errors (for now?) because we
// always read off the end of the pty after the process
// is done
self.output_done = true;
}
}
}
if !self.exit_done {
let exit_poll = self.process.poll().context(ProcessExitPoll);
match exit_poll {
Ok(futures::Async::Ready(status)) => {
self.exit_done = true;
return Ok(futures::Async::Ready(Some(
crate::eval::CommandEvent::ProcessExit(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)
}
}
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