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use crate::{io, RootFilter, Roots, VfsRoot};
use crossbeam_channel::Sender;
use drop_bomb::DropBomb;
use notify::{DebouncedEvent, RecommendedWatcher, RecursiveMode, Watcher as NotifyWatcher};
use parking_lot::Mutex;
use std::{
fs,
path::{Path, PathBuf},
sync::{mpsc, Arc},
thread,
time::Duration,
};
use walkdir::WalkDir;
#[derive(Debug)]
enum ChangeKind {
Create,
Write,
Remove,
}
const WATCHER_DELAY: Duration = Duration::from_millis(250);
pub(crate) struct Watcher {
thread: thread::JoinHandle<()>,
bomb: DropBomb,
watcher: Arc<Mutex<Option<RecommendedWatcher>>>,
}
impl Watcher {
pub(crate) fn start(
roots: Arc<Roots>,
output_sender: Sender<io::TaskResult>,
) -> Result<Watcher, Box<std::error::Error>> {
let (input_sender, input_receiver) = mpsc::channel();
let watcher = Arc::new(Mutex::new(Some(notify::watcher(
input_sender,
WATCHER_DELAY,
)?)));
let sender = output_sender.clone();
let watcher_clone = watcher.clone();
let thread = thread::spawn(move || {
let worker = WatcherWorker {
roots,
watcher: watcher_clone,
sender,
};
input_receiver
.into_iter()
// forward relevant events only
.try_for_each(|change| worker.handle_debounced_event(change))
.unwrap()
});
Ok(Watcher {
thread,
watcher,
bomb: DropBomb::new(format!("Watcher was not shutdown")),
})
}
pub fn watch_root(&mut self, filter: &RootFilter) {
for res in WalkDir::new(&filter.root)
.into_iter()
.filter_entry(filter.entry_filter())
{
match res {
Ok(entry) => {
if entry.file_type().is_dir() {
watch_one(self.watcher.as_ref(), entry.path());
}
}
Err(e) => log::warn!("watcher error: {}", e),
}
}
}
pub fn shutdown(mut self) -> thread::Result<()> {
self.bomb.defuse();
drop(self.watcher.lock().take());
let res = self.thread.join();
match &res {
Ok(()) => log::info!("... Watcher terminated with ok"),
Err(_) => log::error!("... Watcher terminated with err"),
}
res
}
}
struct WatcherWorker {
watcher: Arc<Mutex<Option<RecommendedWatcher>>>,
roots: Arc<Roots>,
sender: Sender<io::TaskResult>,
}
impl WatcherWorker {
fn handle_debounced_event(&self, ev: DebouncedEvent) -> Result<(), Box<std::error::Error>> {
match ev {
DebouncedEvent::NoticeWrite(_)
| DebouncedEvent::NoticeRemove(_)
| DebouncedEvent::Chmod(_) => {
// ignore
}
DebouncedEvent::Rescan => {
// TODO rescan all roots
}
DebouncedEvent::Create(path) => {
self.handle_change(path, ChangeKind::Create);
}
DebouncedEvent::Write(path) => {
self.handle_change(path, ChangeKind::Write);
}
DebouncedEvent::Remove(path) => {
self.handle_change(path, ChangeKind::Remove);
}
DebouncedEvent::Rename(src, dst) => {
self.handle_change(src, ChangeKind::Remove);
self.handle_change(dst, ChangeKind::Create);
}
DebouncedEvent::Error(err, path) => {
// TODO should we reload the file contents?
log::warn!("watcher error \"{}\", {:?}", err, path);
}
}
Ok(())
}
fn handle_change(&self, path: PathBuf, kind: ChangeKind) {
if let Err(e) = self.try_handle_change(path, kind) {
log::warn!("watcher error: {}", e)
}
}
fn try_handle_change(
&self,
path: PathBuf,
kind: ChangeKind,
) -> Result<(), Box<std::error::Error>> {
let (root, rel_path) = match self.roots.find(&path) {
Some(x) => x,
None => return Ok(()),
};
match kind {
ChangeKind::Create => {
if path.is_dir() {
self.watch_recursive(&path, root);
} else {
let text = fs::read_to_string(&path)?;
self.sender.send(io::TaskResult::AddSingleFile {
root,
path: rel_path,
text,
})?
}
}
ChangeKind::Write => {
let text = fs::read_to_string(&path)?;
self.sender.send(io::TaskResult::ChangeSingleFile {
root,
path: rel_path,
text,
})?
}
ChangeKind::Remove => self.sender.send(io::TaskResult::RemoveSingleFile {
root,
path: rel_path,
})?,
}
Ok(())
}
fn watch_recursive(&self, dir: &Path, root: VfsRoot) {
let filter = &self.roots[root];
for res in WalkDir::new(dir)
.into_iter()
.filter_entry(filter.entry_filter())
{
match res {
Ok(entry) => {
if entry.file_type().is_dir() {
watch_one(self.watcher.as_ref(), entry.path());
} else {
// emit only for files otherwise we will cause watch_recursive to be called again with a dir that we are already watching
// emit as create because we haven't seen it yet
self.handle_change(entry.path().to_path_buf(), ChangeKind::Create);
}
}
Err(e) => log::warn!("watcher error: {}", e),
}
}
}
}
fn watch_one(watcher: &Mutex<Option<RecommendedWatcher>>, dir: &Path) {
if let Some(watcher) = watcher.lock().as_mut() {
match watcher.watch(dir, RecursiveMode::NonRecursive) {
Ok(()) => log::debug!("watching \"{}\"", dir.display()),
Err(e) => log::warn!("could not watch \"{}\": {}", dir.display(), e),
}
}
}
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