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use std::collections::{HashMap, HashSet};
use std::sync::{Arc, RwLock};
use std::sync::mpsc::Sender;
use std::fs;
use std::thread;
use super::{Error, Event, op, Result, Watcher};
use std::path::{Path, PathBuf};
use std::time::Duration;
use self::walkdir::WalkDir;
use filetime::FileTime;
extern crate walkdir;
pub struct PollWatcher {
tx: Sender<Event>,
watches: Arc<RwLock<HashSet<PathBuf>>>,
open: Arc<RwLock<bool>>,
}
impl PollWatcher {
pub fn with_delay(tx: Sender<Event>, delay: u32) -> Result<PollWatcher> {
let mut p = PollWatcher {
tx: tx,
watches: Arc::new(RwLock::new(HashSet::new())),
open: Arc::new(RwLock::new(true)),
};
p.run(delay);
Ok(p)
}
fn run(&mut self, delay: u32) {
let tx = self.tx.clone();
let watches = self.watches.clone();
let open = self.open.clone();
thread::spawn(move || {
let mut mtimes: HashMap<PathBuf, u64> = HashMap::new();
loop {
if delay != 0 {
thread::sleep(Duration::from_millis(delay as u64));
}
if !(*open.read().unwrap()) {
break;
}
for watch in watches.read().unwrap().iter() {
let meta = fs::metadata(watch);
if !meta.is_ok() {
let _ = tx.send(Event {
path: Some(watch.clone()),
op: Err(Error::PathNotFound),
});
continue;
}
match meta {
Err(e) => {
let _ = tx.send(Event {
path: Some(watch.clone()),
op: Err(Error::Io(e)),
});
continue;
}
Ok(stat) => {
let modified = FileTime::from_last_modification_time(&stat).seconds();
match mtimes.insert(watch.clone(), modified) {
None => continue,
Some(old) => {
if modified > old {
let _ = tx.send(Event {
path: Some(watch.clone()),
op: Ok(op::WRITE),
});
continue;
}
}
}
if !stat.is_dir() {
continue;
}
}
}
for entry in WalkDir::new(watch)
.follow_links(true)
.into_iter()
.filter_map(|e| e.ok()) {
let path = entry.path();
match fs::metadata(&path) {
Err(e) => {
let _ = tx.send(Event {
path: Some(path.to_path_buf()),
op: Err(Error::Io(e)),
});
continue;
}
Ok(stat) => {
let modified = FileTime::from_last_modification_time(&stat)
.seconds();
match mtimes.insert(path.to_path_buf(), modified) {
None => continue,
Some(old) => {
if modified > old {
let _ = tx.send(Event {
path: Some(path.to_path_buf()),
op: Ok(op::WRITE),
});
continue;
}
}
}
}
}
}
}
}
});
}
}
impl Watcher for PollWatcher {
fn new(tx: Sender<Event>) -> Result<PollWatcher> {
PollWatcher::with_delay(tx, 10)
}
fn watch<P: AsRef<Path>>(&mut self, path: P) -> Result<()> {
(*self.watches).write().unwrap().insert(path.as_ref().to_path_buf());
Ok(())
}
fn unwatch<P: AsRef<Path>>(&mut self, path: P) -> Result<()> {
if (*self.watches).write().unwrap().remove(path.as_ref()) {
Ok(())
} else {
Err(Error::WatchNotFound)
}
}
}
impl Drop for PollWatcher {
fn drop(&mut self) {
{
let mut open = (*self.open).write().unwrap();
(*open) = false;
}
}
}