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remove watcher ctx

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This commit is contained in:
Aleksey Kladov 2019-01-26 17:17:28 +03:00
parent bf98fc609e
commit 9f16892b94
1 changed files with 77 additions and 65 deletions
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142
crates/ra_vfs/src/io.rs
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@ -13,8 +13,6 @@ use notify::{DebouncedEvent, RecommendedWatcher, RecursiveMode, Watcher as _Watc
use crate::{RootConfig, Roots, VfsRoot};
type Result<T> = std::result::Result<T, crossbeam_channel::SendError<TaskResult>>;
pub(crate) enum Task {
AddRoot {
root: VfsRoot,
@ -62,7 +60,6 @@ impl Worker {
pub(crate) fn start(roots: Arc<Roots>) -> Worker {
// This is a pretty elaborate setup of threads & channels! It is
// explained by the following concerns:
// * we need to burn a thread translating from notify's mpsc to
// crossbeam_channel.
// * we want to read all files from a single thread, to gurantee that
@ -79,48 +76,57 @@ impl Worker {
let (notify_sender, notify_receiver) = mpsc::channel();
// These are the corresponding crossbeam channels
let (watcher_sender, watcher_receiver) = unbounded();
let watcher = notify::watcher(notify_sender, WATCHER_DELAY)
let mut watcher = notify::watcher(notify_sender, WATCHER_DELAY)
.map_err(|e| log::error!("failed to spawn notify {}", e))
.ok();
let mut ctx = WatcherCtx {
roots,
watcher,
sender: output_sender,
};
// Start a silly thread to tranform between two channels
let thread = thread::spawn(move || {
let _ = notify_receiver
notify_receiver
.into_iter()
// forward relevant events only
.for_each(|event| convert_notify_event(event, &watcher_sender));
.for_each(|event| convert_notify_event(event, &watcher_sender))
});
// Process requests from the called or notifications from
// watcher until the caller says stop.
loop {
select! {
// Received request from the caller. If this channel is
// closed, we should shutdown everything.
recv(input_receiver) -> t => match t {
Err(RecvError) => break,
Ok(Task::AddRoot { root, config }) => watch_root(&mut ctx, root, Arc::clone(&config)),
Err(RecvError) => {
drop(input_receiver);
break
},
Ok(Task::AddRoot { root, config }) => {
watch_root(watcher.as_mut(), &output_sender, root, Arc::clone(&config));
}
},
// Watcher send us changes. If **this** channel is
// closed, the watcher has died, which indicates a bug
// -- escalate!
recv(watcher_receiver) -> event => match event {
Err(RecvError) => panic!("watcher is dead"),
Ok((path, change)) => WatcherCtx::handle_change(&mut ctx, path, change).unwrap(),
Ok((path, change)) => {
handle_change(watcher.as_mut(), &output_sender, &*roots, path, change);
}
},
}
}
drop(ctx.watcher.take());
drop(ctx);
let res2 = thread.join();
match &res2 {
// Stopped the watcher
drop(watcher.take());
// Drain pending events: we are not inrerested in them anyways!
watcher_receiver.into_iter().for_each(|_| ());
let res = thread.join();
match &res {
Ok(()) => log::info!("... Watcher terminated with ok"),
Err(_) => log::error!("... Watcher terminated with err"),
}
res2.unwrap();
res.unwrap();
},
);
Worker {
worker,
worker_handle,
@ -141,9 +147,14 @@ impl Worker {
}
}
fn watch_root(woker: &mut WatcherCtx, root: VfsRoot, config: Arc<RootConfig>) {
fn watch_root(
watcher: Option<&mut RecommendedWatcher>,
sender: &Sender<TaskResult>,
root: VfsRoot,
config: Arc<RootConfig>,
) {
log::debug!("loading {} ...", config.root.as_path().display());
let files = watch_recursive(woker.watcher.as_mut(), config.root.as_path(), &*config)
let files = watch_recursive(watcher, config.root.as_path(), &*config)
.into_iter()
.filter_map(|path| {
let abs_path = path.to_path(&config.root);
@ -151,20 +162,14 @@ fn watch_root(woker: &mut WatcherCtx, root: VfsRoot, config: Arc<RootConfig>) {
Some((path, text))
})
.collect();
woker
.sender
sender
.send(TaskResult::BulkLoadRoot { root, files })
.unwrap();
log::debug!("... loaded {}", config.root.as_path().display());
}
struct WatcherCtx {
roots: Arc<Roots>,
watcher: Option<RecommendedWatcher>,
sender: Sender<TaskResult>,
}
fn convert_notify_event(event: DebouncedEvent, sender: &Sender<(PathBuf, ChangeKind)>) {
// forward relevant events only
match event {
DebouncedEvent::NoticeWrite(_)
| DebouncedEvent::NoticeRemove(_)
@ -194,48 +199,55 @@ fn convert_notify_event(event: DebouncedEvent, sender: &Sender<(PathBuf, ChangeK
}
}
impl WatcherCtx {
fn handle_change(&mut self, path: PathBuf, kind: ChangeKind) -> Result<()> {
let (root, rel_path) = match self.roots.find(&path) {
None => return Ok(()),
Some(it) => it,
};
let config = &self.roots[root];
match kind {
ChangeKind::Create => {
let mut paths = Vec::new();
if path.is_dir() {
paths.extend(watch_recursive(self.watcher.as_mut(), &path, &config));
} else {
paths.push(rel_path);
}
paths
.into_iter()
.filter_map(|rel_path| {
let abs_path = rel_path.to_path(&config.root);
let text = read_to_string(&abs_path)?;
Some((rel_path, text))
})
.try_for_each(|(path, text)| {
self.sender
.send(TaskResult::AddSingleFile { root, path, text })
})?
fn handle_change(
watcher: Option<&mut RecommendedWatcher>,
sender: &Sender<TaskResult>,
roots: &Roots,
path: PathBuf,
kind: ChangeKind,
) {
let (root, rel_path) = match roots.find(&path) {
None => return,
Some(it) => it,
};
let config = &roots[root];
match kind {
ChangeKind::Create => {
let mut paths = Vec::new();
if path.is_dir() {
paths.extend(watch_recursive(watcher, &path, &config));
} else {
paths.push(rel_path);
}
ChangeKind::Write => {
if let Some(text) = read_to_string(&path) {
self.sender.send(TaskResult::ChangeSingleFile {
paths
.into_iter()
.filter_map(|rel_path| {
let abs_path = rel_path.to_path(&config.root);
let text = read_to_string(&abs_path)?;
Some((rel_path, text))
})
.try_for_each(|(path, text)| {
sender.send(TaskResult::AddSingleFile { root, path, text })
})
.unwrap()
}
ChangeKind::Write => {
if let Some(text) = read_to_string(&path) {
sender
.send(TaskResult::ChangeSingleFile {
root,
path: rel_path,
text,
})?;
}
})
.unwrap();
}
ChangeKind::Remove => self.sender.send(TaskResult::RemoveSingleFile {
}
ChangeKind::Remove => sender
.send(TaskResult::RemoveSingleFile {
root,
path: rel_path,
})?,
}
Ok(())
})
.unwrap(),
}
}