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use anyhow::Result;
use crossbeam_channel::{unbounded, Sender};
use notify::{Error, RecommendedWatcher, RecursiveMode, Watcher};
use notify_debouncer_mini::{new_debouncer, DebouncedEvent};
use scopetime::scope_time;
use std::{path::Path, thread, time::Duration};
pub struct RepoWatcher {
receiver: crossbeam_channel::Receiver<()>,
}
impl RepoWatcher {
pub fn new(workdir: &str) -> Self {
log::trace!(
"recommended watcher: {:?}",
RecommendedWatcher::kind()
);
let (tx, rx) = std::sync::mpsc::channel();
let workdir = workdir.to_string();
thread::spawn(move || {
let timeout = Duration::from_secs(2);
create_watcher(timeout, tx, &workdir);
});
let (out_tx, out_rx) = unbounded();
thread::spawn(move || {
if let Err(e) = Self::forwarder(&rx, &out_tx) {
//maybe we need to restart the forwarder now?
log::error!("notify receive error: {}", e);
}
});
Self { receiver: out_rx }
}
///
pub fn receiver(&self) -> crossbeam_channel::Receiver<()> {
self.receiver.clone()
}
fn forwarder(
receiver: &std::sync::mpsc::Receiver<
Result<Vec<DebouncedEvent>, Vec<Error>>,
>,
sender: &Sender<()>,
) -> Result<()> {
loop {
let ev = receiver.recv()?;
if let Ok(ev) = ev {
log::debug!("notify events: {}", ev.len());
for (idx, ev) in ev.iter().enumerate() {
log::debug!("notify [{}]: {:?}", idx, ev);
}
if !ev.is_empty() {
sender.send(())?;
}
}
}
}
}
fn create_watcher(
timeout: Duration,
tx: std::sync::mpsc::Sender<
Result<Vec<DebouncedEvent>, Vec<Error>>,
>,
workdir: &str,
) {
scope_time!("create_watcher");
let mut bouncer =
new_debouncer(timeout, None, tx).expect("Watch create error");
bouncer
.watcher()
.watch(Path::new(&workdir), RecursiveMode::Recursive)
.expect("Watch error");
std::mem::forget(bouncer);
}
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