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use slog::{OwnedKV, SendSyncRefUnwindSafeKV};
use tokio::process::Child;
use crate::common::*;
#[derive(Debug, Clone)]
pub struct Context {
log: Logger,
error_sender: mpsc::Sender<Error>,
}
impl Context {
pub fn create(log: Logger) -> (Self, BoxFuture<()>) {
let (error_sender, mut receiver) = mpsc::channel(1);
let context = Context { log, error_sender };
let worker_future = async move {
match receiver.next().await {
None => Ok(()),
Some(err) => Err(err),
}
};
(context, worker_future.boxed())
}
#[cfg(test)]
pub fn create_for_test(test_name: &str) -> (Self, BoxFuture<()>) {
use slog::Drain;
use slog_async::OverflowStrategy;
let decorator = slog_term::PlainDecorator::new(std::io::stderr());
let formatted = slog_term::FullFormat::new(decorator).build().fuse();
let filtered = slog_envlogger::new(formatted);
let drain = slog_async::Async::new(filtered)
.chan_size(2)
.overflow_strategy(OverflowStrategy::Block)
.build()
.fuse();
let log = Logger::root(drain, o!("test" => test_name.to_owned()));
Self::create(log)
}
pub fn log(&self) -> &Logger {
&self.log
}
pub fn child<T>(&self, log_kv: OwnedKV<T>) -> Self
where
T: SendSyncRefUnwindSafeKV + 'static,
{
Context {
log: self.log.new(log_kv),
error_sender: self.error_sender.clone(),
}
}
pub fn spawn_worker<W>(&self, worker: W)
where
W: Future<Output = Result<()>> + Send + 'static,
{
let log = self.log.clone();
let mut error_sender = self.error_sender.clone();
tokio::spawn(
async move {
if let Err(err) = worker.await {
debug!(log, "reporting background worker error: {}", err);
if let Err(_err) = error_sender.send(err).await {
debug!(log, "broken pipe reporting background worker error");
}
}
}
.boxed(),
);
}
pub fn spawn_process(&self, name: String, child: Child) {
let worker = async move {
match child.await {
Ok(ref status) if status.success() => Ok(()),
Ok(status) => Err(format_err!("{} failed with {}", name, status)),
Err(err) => Err(format_err!("{} failed with error: {}", name, err)),
}
};
self.spawn_worker(worker.boxed());
}
}