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use std::{
path::{Path, PathBuf},
sync::mpsc,
thread,
time::Duration,
};
use crate::io;
use crossbeam_channel::Sender;
use drop_bomb::DropBomb;
use notify::{DebouncedEvent, RecommendedWatcher, RecursiveMode, Watcher as NotifyWatcher};
pub struct Watcher {
watcher: RecommendedWatcher,
thread: thread::JoinHandle<()>,
bomb: DropBomb,
}
#[derive(Debug)]
pub enum WatcherChange {
Create(PathBuf),
Write(PathBuf),
Remove(PathBuf),
Rescan,
}
fn send_change_events(
ev: DebouncedEvent,
sender: &Sender<io::Task>,
) -> Result<(), Box<std::error::Error>> {
match ev {
DebouncedEvent::NoticeWrite(_)
| DebouncedEvent::NoticeRemove(_)
| DebouncedEvent::Chmod(_) => {
// ignore
}
DebouncedEvent::Rescan => {
sender.send(io::Task::LoadChange(WatcherChange::Rescan))?;
}
DebouncedEvent::Create(path) => {
sender.send(io::Task::LoadChange(WatcherChange::Create(path)))?;
}
DebouncedEvent::Write(path) => {
sender.send(io::Task::LoadChange(WatcherChange::Write(path)))?;
}
DebouncedEvent::Remove(path) => {
sender.send(io::Task::LoadChange(WatcherChange::Remove(path)))?;
}
DebouncedEvent::Rename(src, dst) => {
sender.send(io::Task::LoadChange(WatcherChange::Remove(src)))?;
sender.send(io::Task::LoadChange(WatcherChange::Create(dst)))?;
}
DebouncedEvent::Error(err, path) => {
// TODO should we reload the file contents?
log::warn!("watcher error {}, {:?}", err, path);
}
}
Ok(())
}
impl Watcher {
pub(crate) fn start(
output_sender: Sender<io::Task>,
) -> Result<Watcher, Box<std::error::Error>> {
let (input_sender, input_receiver) = mpsc::channel();
let watcher = notify::watcher(input_sender, Duration::from_millis(250))?;
let thread = thread::spawn(move || {
input_receiver
.into_iter()
// forward relevant events only
.try_for_each(|change| send_change_events(change, &output_sender))
.unwrap()
});
Ok(Watcher {
watcher,
thread,
bomb: DropBomb::new(format!("Watcher was not shutdown")),
})
}
pub fn watch(&mut self, root: impl AsRef<Path>) -> Result<(), Box<std::error::Error>> {
self.watcher.watch(root, RecursiveMode::Recursive)?;
Ok(())
}
pub fn shutdown(mut self) -> thread::Result<()> {
self.bomb.defuse();
drop(self.watcher);
let res = self.thread.join();
match &res {
Ok(()) => log::info!("... Watcher terminated with ok"),
Err(_) => log::error!("... Watcher terminated with err"),
}
res
}
}
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