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|
//! An implementation of `loader::Handle`, based on `walkdir` and `notify`.
//!
//! The file watching bits here are untested and quite probably buggy. For this
//! reason, by default we don't watch files and rely on editor's file watching
//! capabilities.
//!
//! Hopefully, one day a reliable file watching/walking crate appears on
//! crates.io, and we can reduce this to trivial glue code.
mod include;
use std::convert::{TryFrom, TryInto};
use crossbeam_channel::{never, select, unbounded, Receiver, Sender};
use notify::{RecommendedWatcher, RecursiveMode, Watcher};
use paths::{AbsPath, AbsPathBuf};
use vfs::loader;
use walkdir::WalkDir;
use crate::include::Include;
#[derive(Debug)]
pub struct NotifyHandle {
// Relative order of fields below is significant.
sender: Sender<Message>,
thread: jod_thread::JoinHandle,
}
#[derive(Debug)]
enum Message {
Config(loader::Config),
Invalidate(AbsPathBuf),
}
impl loader::Handle for NotifyHandle {
fn spawn(sender: loader::Sender) -> NotifyHandle {
let actor = NotifyActor::new(sender);
let (sender, receiver) = unbounded::<Message>();
let thread = jod_thread::spawn(move || actor.run(receiver));
NotifyHandle { sender, thread }
}
fn set_config(&mut self, config: loader::Config) {
self.sender.send(Message::Config(config)).unwrap()
}
fn invalidate(&mut self, path: AbsPathBuf) {
self.sender.send(Message::Invalidate(path)).unwrap();
}
fn load_sync(&mut self, path: &AbsPath) -> Option<Vec<u8>> {
read(path)
}
}
type NotifyEvent = notify::Result<notify::Event>;
struct NotifyActor {
sender: loader::Sender,
config: Vec<(AbsPathBuf, Include, bool)>,
// Drop order is significant.
watcher: Option<(RecommendedWatcher, Receiver<NotifyEvent>)>,
}
#[derive(Debug)]
enum Event {
Message(Message),
NotifyEvent(NotifyEvent),
}
impl NotifyActor {
fn new(sender: loader::Sender) -> NotifyActor {
NotifyActor { sender, config: Vec::new(), watcher: None }
}
fn next_event(&self, receiver: &Receiver<Message>) -> Option<Event> {
let watcher_receiver = self.watcher.as_ref().map(|(_, receiver)| receiver);
select! {
recv(receiver) -> it => it.ok().map(Event::Message),
recv(watcher_receiver.unwrap_or(&never())) -> it => Some(Event::NotifyEvent(it.unwrap())),
}
}
fn run(mut self, inbox: Receiver<Message>) {
while let Some(event) = self.next_event(&inbox) {
log::debug!("vfs-notify event: {:?}", event);
match event {
Event::Message(msg) => match msg {
Message::Config(config) => {
self.watcher = None;
if !config.watch.is_empty() {
let (watcher_sender, watcher_receiver) = unbounded();
let watcher = log_notify_error(Watcher::new_immediate(move |event| {
watcher_sender.send(event).unwrap()
}));
self.watcher = watcher.map(|it| (it, watcher_receiver));
}
let n_total = config.load.len();
self.send(loader::Message::Progress { n_total, n_done: 0 });
self.config.clear();
for (i, entry) in config.load.into_iter().enumerate() {
let watch = config.watch.contains(&i);
let files = self.load_entry(entry, watch);
self.send(loader::Message::Loaded { files });
self.send(loader::Message::Progress { n_total, n_done: i + 1 });
}
self.config.sort_by(|x, y| x.0.cmp(&y.0));
}
Message::Invalidate(path) => {
let contents = read(path.as_path());
let files = vec![(path, contents)];
self.send(loader::Message::Loaded { files });
}
},
Event::NotifyEvent(event) => {
if let Some(event) = log_notify_error(event) {
let files = event
.paths
.into_iter()
.map(|path| AbsPathBuf::try_from(path).unwrap())
.filter_map(|path| {
let is_dir = path.is_dir();
let is_file = path.is_file();
let config_idx =
match self.config.binary_search_by(|it| it.0.cmp(&path)) {
Ok(it) => it,
Err(it) => it.saturating_sub(1),
};
let include = self.config.get(config_idx).and_then(|it| {
let rel_path = path.strip_prefix(&it.0)?;
Some((rel_path, &it.1))
});
if let Some((rel_path, include)) = include {
if is_dir && include.exclude_dir(&rel_path)
|| is_file && !include.include_file(&rel_path)
{
return None;
}
}
if is_dir {
self.watch(path);
return None;
}
if !is_file {
return None;
}
let contents = read(&path);
Some((path, contents))
})
.collect();
self.send(loader::Message::Loaded { files })
}
}
}
}
}
fn load_entry(
&mut self,
entry: loader::Entry,
watch: bool,
) -> Vec<(AbsPathBuf, Option<Vec<u8>>)> {
match entry {
loader::Entry::Files(files) => files
.into_iter()
.map(|file| {
if watch {
self.watch(file.clone())
}
let contents = read(file.as_path());
(file, contents)
})
.collect::<Vec<_>>(),
loader::Entry::Directory { path, include } => {
let include = Include::new(include);
self.config.push((path.clone(), include.clone(), watch));
let files = WalkDir::new(&path)
.into_iter()
.filter_entry(|entry| {
let abs_path: &AbsPath = entry.path().try_into().unwrap();
match abs_path.strip_prefix(&path) {
Some(rel_path) => {
!(entry.file_type().is_dir() && include.exclude_dir(rel_path))
}
None => false,
}
})
.filter_map(|entry| entry.ok())
.filter_map(|entry| {
let is_dir = entry.file_type().is_dir();
let is_file = entry.file_type().is_file();
let abs_path = AbsPathBuf::try_from(entry.into_path()).unwrap();
if is_dir && watch {
self.watch(abs_path.clone());
}
let rel_path = abs_path.strip_prefix(&path)?;
if is_file && include.include_file(&rel_path) {
Some(abs_path)
} else {
None
}
});
files
.map(|file| {
let contents = read(file.as_path());
(file, contents)
})
.collect()
}
}
}
fn watch(&mut self, path: AbsPathBuf) {
if let Some((watcher, _)) = &mut self.watcher {
log_notify_error(watcher.watch(&path, RecursiveMode::NonRecursive));
}
}
fn send(&mut self, msg: loader::Message) {
(self.sender)(msg)
}
}
fn read(path: &AbsPath) -> Option<Vec<u8>> {
std::fs::read(path).ok()
}
fn log_notify_error<T>(res: notify::Result<T>) -> Option<T> {
res.map_err(|err| log::warn!("notify error: {}", err)).ok()
}
|
