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use futures::future::Future as _;
use futures::sink::Sink as _;
use futures::stream::Stream as _;
use snafu::{OptionExt as _, ResultExt as _};
use std::io::Write as _;
#[derive(Debug, snafu::Snafu)]
pub enum Error {
#[snafu(display("invalid command index: {}", idx))]
InvalidCommandIndex { idx: usize },
#[snafu(display("error sending message: {}", source))]
Send {
source: futures::sync::mpsc::SendError<StateEvent>,
},
#[snafu(display("error printing output: {}", source))]
PrintOutput { source: std::io::Error },
#[snafu(display("this error should not be possible"))]
Unreachable,
}
pub type Result<T> = std::result::Result<T, Error>;
#[derive(Debug)]
pub enum StateEvent {
Start(usize, String, Vec<String>),
Output(usize, Vec<u8>),
Exit(usize, std::process::ExitStatus),
}
#[derive(Debug)]
pub struct State {
r: futures::sync::mpsc::Receiver<StateEvent>,
commands: std::collections::HashMap<usize, Command>,
}
impl State {
pub fn new(r: futures::sync::mpsc::Receiver<StateEvent>) -> Self {
Self {
r,
commands: std::collections::HashMap::new(),
}
}
pub fn command_start(
&mut self,
idx: usize,
cmd: &str,
args: &[String],
) -> Result<()> {
snafu::ensure!(
!self.commands.contains_key(&idx),
InvalidCommandIndex { idx }
);
let command = Command::new(cmd, args);
self.commands.insert(idx, command.clone());
eprint!("running '{} {:?}'\r\n", command.cmd, command.args);
Ok(())
}
pub fn command_output(
&mut self,
idx: usize,
output: &[u8],
) -> Result<()> {
let command = self
.commands
.get_mut(&idx)
.context(InvalidCommandIndex { idx })?;
command.output.append(&mut output.to_vec());
let stdout = std::io::stdout();
let mut stdout = stdout.lock();
stdout.write(output).context(PrintOutput)?;
stdout.flush().context(PrintOutput)?;
Ok(())
}
pub fn command_exit(
&mut self,
idx: usize,
status: std::process::ExitStatus,
) -> Result<()> {
let command = self
.commands
.get_mut(&idx)
.context(InvalidCommandIndex { idx })?;
command.status = Some(status);
eprint!("command exited: {}\r\n", status);
Ok(())
}
}
impl futures::future::Future for State {
type Item = ();
type Error = Error;
fn poll(&mut self) -> futures::Poll<Self::Item, Self::Error> {
loop {
let event = futures::try_ready!(self
.r
.poll()
.map_err(|_| Error::Unreachable));
match event {
Some(StateEvent::Start(idx, cmd, args)) => {
self.command_start(idx, &cmd, &args)?;
}
Some(StateEvent::Output(idx, output)) => {
self.command_output(idx, &output)?;
}
Some(StateEvent::Exit(idx, status)) => {
self.command_exit(idx, status)?;
}
None => return Ok(futures::Async::Ready(())),
}
}
}
}
pub fn update(
w: futures::sync::mpsc::Sender<StateEvent>,
idx: usize,
event: &crate::eval::CommandEvent,
) -> impl futures::future::Future<Item = (), Error = Error> {
match event {
crate::eval::CommandEvent::CommandStart(cmd, args) => {
w.send(crate::state::StateEvent::Start(
idx,
cmd.to_string(),
args.to_vec(),
))
}
crate::eval::CommandEvent::Output(out) => {
w.send(crate::state::StateEvent::Output(idx, out.to_vec()))
}
crate::eval::CommandEvent::CommandExit(status) => {
w.send(crate::state::StateEvent::Exit(idx, *status))
}
}
.map(|_| ())
.map_err(|e| Error::Send { source: e })
}
#[derive(Debug, Clone)]
struct Command {
cmd: String,
args: Vec<String>,
output: Vec<u8>,
status: Option<std::process::ExitStatus>,
}
impl Command {
fn new(cmd: &str, args: &[String]) -> Self {
Self {
cmd: cmd.to_string(),
args: args.to_vec(),
output: vec![],
status: None,
}
}
}
|
