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use crate::app::{BackendEvent, BackendTask};
use crate::infra::ChezmoiClient;
use crate::preview::load_file_preview;
use tokio::sync::mpsc::{UnboundedReceiver, UnboundedSender};
pub(crate) async fn worker_loop(
client: std::sync::Arc<dyn ChezmoiClient>,
mut task_rx: UnboundedReceiver<BackendTask>,
event_tx: UnboundedSender<BackendEvent>,
) {
while let Some(task) = task_rx.recv().await {
tracing::debug!(task = ?task, "backend task received");
match task {
BackendTask::RefreshAll => {
let c1 = client.clone();
let status_task = tokio::task::spawn_blocking(move || c1.status());
let c2 = client.clone();
let managed_task = tokio::task::spawn_blocking(move || c2.managed());
let c3 = client.clone();
let unmanaged_task = tokio::task::spawn_blocking(move || c3.unmanaged());
let c4 = client.clone();
let source_task = tokio::task::spawn_blocking(move || c4.source());
let (status, managed, unmanaged, source) =
tokio::join!(status_task, managed_task, unmanaged_task, source_task);
match (status, managed, unmanaged, source) {
(
Ok(Ok(status)),
Ok(Ok(managed)),
Ok(Ok(unmanaged)),
Ok(Ok((source_dir, source))),
) => {
tracing::info!(
status = status.len(),
managed = managed.len(),
unmanaged = unmanaged.len(),
source = source.len(),
source_dir = %source_dir.display(),
"refresh completed"
);
if event_tx
.send(BackendEvent::Refreshed {
status,
managed,
unmanaged,
source_dir: Some(source_dir),
source,
})
.is_err()
{
break;
}
}
(s, m, u, src) => {
let message = format!(
"refresh failed: status={:?}, managed={:?}, unmanaged={:?}, source={:?}",
flatten_error(s),
flatten_error(m),
flatten_error(u),
flatten_error(src)
);
if event_tx
.send(BackendEvent::Error {
context: "refresh".to_string(),
message,
})
.is_err()
{
break;
}
}
}
}
BackendTask::LoadDiff { request_id, target } => {
let c = client.clone();
let target_for_worker = target.clone();
let result =
tokio::task::spawn_blocking(move || c.diff(target_for_worker.as_deref())).await;
match result {
Ok(Ok(diff)) => {
if event_tx
.send(BackendEvent::DiffLoaded {
request_id,
target,
diff,
})
.is_err()
{
break;
}
}
other => {
if event_tx
.send(BackendEvent::Error {
context: "diff".to_string(),
message: format!("diff failed: {:?}", flatten_error(other)),
})
.is_err()
{
break;
}
}
}
}
BackendTask::LoadPreview {
request_id,
target,
absolute,
origin,
} => {
let result =
tokio::task::spawn_blocking(move || load_file_preview(&absolute)).await;
match result {
Ok(Ok(content)) => {
if event_tx
.send(BackendEvent::PreviewLoaded {
request_id,
target,
origin,
content,
})
.is_err()
{
break;
}
}
other => {
if event_tx
.send(BackendEvent::Error {
context: "preview".to_string(),
message: format!("preview failed: {:?}", flatten_error(other)),
})
.is_err()
{
break;
}
}
}
}
BackendTask::RunAction { request } => {
let c = client.clone();
let req = request.clone();
let result = tokio::task::spawn_blocking(move || c.run(&req)).await;
match result {
Ok(Ok(result)) => {
if event_tx
.send(BackendEvent::ActionFinished { request, result })
.is_err()
{
break;
}
}
other => {
if event_tx
.send(BackendEvent::Error {
context: "action".to_string(),
message: format!("action failed: {:?}", flatten_error(other)),
})
.is_err()
{
break;
}
}
}
}
}
}
}
fn flatten_error<T>(res: std::result::Result<anyhow::Result<T>, tokio::task::JoinError>) -> String {
match res {
Ok(Ok(_)) => "ok".to_string(),
Ok(Err(err)) => format!("{err:#}"),
Err(err) => format!("join error: {err}"),
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn flatten_error_formats_all_cases() {
let ok = flatten_error::<()>(Ok(Ok(())));
assert_eq!(ok, "ok");
let err = flatten_error::<()>(Ok(Err(anyhow::anyhow!("boom"))));
assert!(err.contains("boom"));
}
}