garage/src/util/background/mod.rs

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Rust
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//! Job runner for futures and async functions
pub mod worker;
use std::collections::HashMap;
use std::sync::Arc;
use serde::{Deserialize, Serialize};
use tokio::sync::{mpsc, watch};
use worker::WorkerProcessor;
pub use worker::{Worker, WorkerState};
/// Job runner for futures and async functions
pub struct BackgroundRunner {
send_worker: mpsc::UnboundedSender<Box<dyn Worker>>,
worker_info: Arc<std::sync::Mutex<HashMap<usize, WorkerInfo>>>,
}
#[derive(Clone, Serialize, Deserialize, Debug)]
pub struct WorkerInfo {
pub name: String,
pub status: WorkerStatus,
pub state: WorkerState,
pub errors: usize,
pub consecutive_errors: usize,
pub last_error: Option<(String, u64)>,
}
/// WorkerStatus is a struct returned by the worker with a bunch of canonical
/// fields to indicate their status to CLI users. All fields are optional.
#[derive(Clone, Serialize, Deserialize, Debug, Default)]
pub struct WorkerStatus {
pub tranquility: Option<u32>,
pub progress: Option<String>,
pub queue_length: Option<u64>,
pub persistent_errors: Option<u64>,
pub freeform: Vec<String>,
}
impl BackgroundRunner {
/// Create a new BackgroundRunner
pub fn new(stop_signal: watch::Receiver<bool>) -> (Arc<Self>, tokio::task::JoinHandle<()>) {
let (send_worker, worker_out) = mpsc::unbounded_channel::<Box<dyn Worker>>();
let worker_info = Arc::new(std::sync::Mutex::new(HashMap::new()));
let mut worker_processor =
WorkerProcessor::new(worker_out, stop_signal, worker_info.clone());
let await_all_done = tokio::spawn(async move {
worker_processor.run().await;
});
let bgrunner = Arc::new(Self {
send_worker,
worker_info,
});
(bgrunner, await_all_done)
}
pub fn get_worker_info(&self) -> HashMap<usize, WorkerInfo> {
self.worker_info.lock().unwrap().clone()
}
pub fn spawn_worker<W>(&self, worker: W)
where
W: Worker + 'static,
{
self.send_worker
.send(Box::new(worker))
.ok()
.expect("Could not put worker in queue");
}
}