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use std::io;
use std::process::Stdio;
use std::sync::Arc;
use futures::{stream, FutureExt, SinkExt, StreamExt, TryStreamExt};
use tokio::process::Command;
use tokio::sync::Notify;
use nails::execution::{
self, child_channel, sink_for, stream_for, ChildInput, ChildOutput, ExitCode,
};
use nails::{server, Nail};
#[derive(Clone)]
pub struct ForkNail;
impl Nail for ForkNail {
fn spawn(&self, cmd: execution::Command) -> Result<server::Child, io::Error> {
let mut child = Command::new(cmd.command.clone())
.args(cmd.args)
.env_clear()
.envs(cmd.env)
.current_dir(cmd.working_dir)
.kill_on_drop(true)
.stdout(Stdio::piped())
.stderr(Stdio::piped())
.stdin(Stdio::piped())
.spawn()?;
let (stdin_write, stdin_read) = child_channel::<ChildInput>();
let stdin = child.stdin.take().unwrap();
tokio::spawn(async move {
let mut input_stream = stdin_read.map(|child_input| match child_input {
ChildInput::Stdin(bytes) => Ok(bytes),
});
sink_for(stdin)
.send_all(&mut input_stream)
.map(|_| ())
.await;
});
let stdout_stream = stream_for(child.stdout.take().unwrap()).map_ok(ChildOutput::Stdout);
let stderr_stream = stream_for(child.stderr.take().unwrap()).map_ok(ChildOutput::Stderr);
let output_stream = stream::select(stdout_stream, stderr_stream).boxed();
let killed = Arc::new(Notify::new());
let killed2 = killed.clone();
let shutdown = async move {
killed2.notify_waiters();
};
let exit_code = async move {
tokio::select! {
res = child.wait() => {
res
}
_ = killed.notified() => {
child.kill().await?;
child.wait().await
}
}
};
Ok(server::Child::new(
output_stream,
Some(stdin_write),
exit_code
.map(|res| match res {
Ok(exit_status) => ExitCode(exit_status.code().unwrap_or(-1)),
Err(_) => ExitCode(-1),
})
.boxed(),
Some(shutdown.boxed()),
))
}
}