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extern crate nix;
use crate::cmd::spawn;
use crate::rules::{self, Rules};
use crate::stdout;
use nix::sys::signal::{self, Signal};
use nix::unistd::Pid;
use std::sync::mpsc::channel;
use std::sync::mpsc::{Sender, TryRecvError};
use std::thread::JoinHandle;
use std::time::Duration;
#[derive(Debug, Clone)]
pub enum WorkerEvent {
InitExecution,
FinishedExecution(Duration),
Tick,
}
pub struct Worker {
canceller: Option<Sender<()>>,
scheduler: Option<Sender<Vec<String>>>,
consumer: Option<JoinHandle<()>>,
}
impl Worker {
pub fn new(verbose: bool, fail_fast: bool, on_event: fn(WorkerEvent)) -> Self {
stdout::verbose("Worker in verbose mode.", verbose);
// Unfortunatelly channels can't have multiple receiver so we need to
// create a channel for each kind of event.
let (tscheduler, rscheduler) = channel::<Vec<String>>();
let (tcancel, rcancel) = channel::<()>();
let consumer = std::thread::spawn(move || {
while let Ok(tasks) = rscheduler.recv() {
on_event(WorkerEvent::InitExecution);
let mut results: Vec<Result<(), String>> = vec![];
let ignored = rcancel.try_recv();
stdout::verbose(&format!("ignored kill: {:?}", ignored), verbose);
let mut has_been_cancelled = false;
let time_execution_started = std::time::Instant::now();
for task in tasks {
if has_been_cancelled
|| (fail_fast
&& !results.clone().into_iter().find(|r| r.is_err()).is_none())
{
break;
}
let mut child = match spawn(&task) {
Ok(child) => child,
Err(err) => {
stdout::error(&format!("failed to create command: {:?}", err));
continue;
}
};
loop {
// We don't want the tasks to run in parallel but
// we need it to be async so we can kill it.
match child.try_wait() {
Ok(None) => {
// Task is still running...
// Check if there is any kill signal otherwise
// continue running
match rcancel.try_recv() {
Ok(_) => {
stdout::verbose(
&format!("---- cancelling: {:?} ----", task),
verbose,
);
if let Err(err) = signal::kill(
Pid::from_raw(child.id() as i32),
// Sends a SIGTERM signal to the process
// and allows it to exit gracefully.
Signal::SIGTERM,
) {
stdout::error(&format!(
"failed to terminate task {:?}: {:?}",
task, err
));
}
if let Ok(status) = child.wait() {
stdout::verbose(
&format!(
"---- finished: {:?} status: {} ----",
task, status
),
verbose,
);
} else {
stdout::error(&format!(
"failed to wait for the task to finish: {:?}",
task
));
}
has_been_cancelled = true;
break;
}
Err(err) if err != TryRecvError::Empty => {
stdout::error(&format!(
"failed to receive cancel event: {:?}",
task
));
break;
}
_ => {
stdout::verbose(
&format!("waiting next tick for task: {}", task),
verbose,
);
on_event(WorkerEvent::Tick);
std::thread::sleep(std::time::Duration::from_millis(200));
}
}
}
Ok(Some(status)) => {
if status.success() {
results.push(Ok(()));
} else {
results.push(Err(format!(
"Command {} has failed with {}",
task, status
)));
}
break;
}
Err(err) => {
results.push(Err(format!(
"Command {} has errored with {}",
task, err
)));
break;
}
};
}
}
if !has_been_cancelled {
let elapsed = time_execution_started.elapsed();
stdout::present_results(results, elapsed);
on_event(WorkerEvent::FinishedExecution(elapsed));
}
}
stdout::info("Consumer thread finished.");
});
Worker {
canceller: Some(tcancel),
scheduler: Some(tscheduler),
consumer: Some(consumer),
}
}
pub fn cancel_running_tasks(&self) -> Result<(), String> {
if let Some(canceller) = self.canceller.as_ref() {
if let Err(err) = canceller.send(()) {
println!("failed to send cancel signal: {:?}", err);
return Err(format!("{:?}", err));
}
}
Ok(())
}
pub fn schedule(&self, rules: Vec<Rules>, filepath: &str) -> Result<(), String> {
if let Some(scheduler) = self.scheduler.as_ref() {
let current_dir = std::env::current_dir().unwrap();
if let Err(err) = scheduler.send(rules::template(
rules::commands(rules),
rules::TemplateOptions {
filepath: Some(filepath.to_string()),
current_dir: format!("{}", current_dir.display()),
},
)) {
return Err(format!("{:?}", err));
}
}
Ok(())
}
}
impl Drop for Worker {
fn drop(&mut self) {
let tc = self.canceller.take();
drop(tc);
let ts = self.scheduler.take();
drop(ts);
if let Some(th) = self.consumer.take() {
th.join().expect("failed to join consumer thread");
}
}
}