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//! File system watcher (notify crate) with debouncing.
use crate::error::Result;
use crossbeam_channel::Receiver;
use llmosafe::llmosafe_kernel::{ReasoningLoop, SiftedSynapse};
use llmosafe::{ResourceGuard, Synapse, WorkingMemory};
use notify::{Config, Event, RecommendedWatcher, RecursiveMode, Watcher as _};
use std::collections::HashSet;
use std::path::{Path, PathBuf};
use std::sync::mpsc;
use std::thread;
use std::time::Duration;
/// A file-system watcher that detects changes in a directory tree and
/// batches them into debounced event batches.
pub struct Watcher {
root: PathBuf,
inner: Option<RecommendedWatcher>,
join_handle: Option<thread::JoinHandle<()>>,
}
impl Watcher {
/// Create a new watcher for the given root directory.
///
/// The watcher is not started yet; call [`Watcher::start`] to begin
/// receiving events.
#[must_use]
pub fn new(root: &Path) -> Self {
Self {
root: root.to_owned(),
inner: None,
join_handle: None,
}
}
/// Start watching the file system for changes.
///
/// # Errors
///
/// Returns an error if the filesystem watcher cannot be created.
#[allow(clippy::too_many_lines)]
pub fn start(&mut self) -> Result<Receiver<Vec<PathBuf>>> {
let (tx, rx) = crossbeam_channel::unbounded();
let (event_tx, event_rx) = mpsc::channel();
let mut watcher = RecommendedWatcher::new(event_tx, Config::default())?;
// Attempt recursive watch on root first (most efficient)
if let Err(err) = watcher.watch(&self.root, RecursiveMode::Recursive) {
eprintln!(
"ix: warning: recursive watch failed: {err}. Falling back to manual walk."
);
let walker = ignore::WalkBuilder::new(&self.root)
.hidden(false)
.git_ignore(true)
.require_git(false)
.add_custom_ignore_filename(".ixignore")
.filter_entry(move |entry| {
let path = entry.path();
let name = path.file_name().and_then(|n| n.to_str()).unwrap_or("");
// Built-in directory defaults
if entry.file_type().is_some_and(|t| t.is_dir())
&& (name == "lost+found"
|| name == ".git"
|| name == "node_modules"
|| name == "target"
|| name == "__pycache__"
|| name == ".tox"
|| name == ".venv"
|| name == "venv"
|| name == ".ix")
{
return false;
}
// Built-in file noise defaults
if entry.file_type().is_some_and(|t| t.is_file()) {
if let Ok(metadata) = entry.metadata()
&& metadata.len() > 10 * 1024 * 1024
{
return false;
}
if name == "Cargo.lock"
|| name == "package-lock.json"
|| name == "pnpm-lock.yaml"
|| name == "shard.ix"
|| name == "shard.ix.tmp"
{
return false;
}
}
// Built-in file extension defaults
if entry.file_type().is_some_and(|t| t.is_file()) {
let ext = path.extension().and_then(|e| e.to_str()).unwrap_or("");
match ext {
// Binary extensions
"so" | "o" | "dylib" | "a" | "dll" | "exe" | "pyc" |
// Media
"jpg" | "png" | "gif" | "mp4" | "mp3" | "pdf" |
// Archives
"zip" | "7z" | "rar" |
// Data
"sqlite" | "db" | "bin" => return false,
_ => {}
}
if name.ends_with(".tar.gz") {
return false;
}
}
true
})
.build();
let mut loop_guard = ReasoningLoop::<20000>::new();
let guard = ResourceGuard::auto(0.5);
let mut memory = WorkingMemory::<64>::new(1000);
for result in walker {
// Cognitive Stability check: entropy must be stable (RSS < 50% ceiling for the walk)
let synapse = guard.check().unwrap_or_else(|_| {
let mut s = Synapse::new();
s.set_raw_entropy(1500); // 1.0 ratio
s
});
let sifted = SiftedSynapse::new(synapse);
let validated = match memory.update(sifted) {
Ok(v) => v,
Err(e) => {
eprintln!(
"ix: critical safety halt during watcher walk: {e:?}. Directory tree too large or RAM low."
);
break;
}
};
if let Err(e) = loop_guard.next_step(validated) {
eprintln!("ix: critical reasoning depth exceeded: {e:?}.");
break;
}
match result {
Ok(entry) => {
if entry.file_type().is_some_and(|t| t.is_dir()) {
let path = entry.path();
if let Err(e) = watcher.watch(path, RecursiveMode::NonRecursive) {
eprintln!(
"ix: warning: watcher failed for {}: {}",
path.display(),
e
);
}
}
}
Err(e) => {
eprintln!("ix: warning: watcher skipping path: {e}");
}
}
}
}
self.inner = Some(watcher);
let handle = thread::spawn(move || {
let mut changed_paths = HashSet::new();
loop {
// Wait for the first event
match event_rx.recv() {
Ok(Ok(event)) => {
Self::collect_paths(&mut changed_paths, event);
// Debounce loop: keep collecting for 500ms after the last event
loop {
match event_rx.recv_timeout(Duration::from_millis(500)) {
Ok(Ok(event)) => {
Self::collect_paths(&mut changed_paths, event);
}
Ok(Err(_)) => {} // notify error, skip
Err(mpsc::RecvTimeoutError::Timeout) => {
// Debounce period over
if !changed_paths.is_empty() {
let paths: Vec<PathBuf> = changed_paths.drain().collect();
if tx.send(paths).is_err() {
return; // Receiver dropped
}
}
break;
}
Err(mpsc::RecvTimeoutError::Disconnected) => return,
}
}
}
Ok(Err(_)) => {},
Err(_) => return, // Watcher dropped
}
}
});
self.join_handle = Some(handle);
Ok(rx)
}
/// Stop watching and join the background event-loop thread.
pub fn stop(&mut self) {
self.inner.take(); // Dropping the watcher stops events
if let Some(handle) = self.join_handle.take() {
let _ = handle.join();
}
}
/// Returns `true` while the underlying notify watcher is active.
#[must_use]
pub const fn is_running(&self) -> bool {
self.inner.is_some()
}
fn collect_paths(set: &mut HashSet<PathBuf>, event: Event) {
if event.kind.is_modify() || event.kind.is_create() || event.kind.is_remove() {
for path in event.paths {
// Ignore the .ix directory changes to avoid loops
if path.components().any(|c| c.as_os_str() == ".ix") {
continue;
}
set.insert(path);
}
}
}
}
#[cfg(test)]
#[allow(clippy::as_conversions, clippy::unwrap_used, clippy::indexing_slicing)]
mod tests {
use super::*;
use crate::error::Error;
use std::fs::File;
use std::io::Write;
use tempfile::tempdir;
#[test]
fn test_watcher_basic() -> Result<()> {
let dir = tempdir().map_err(Error::Io)?;
let mut watcher = Watcher::new(dir.path());
let rx = watcher.start()?;
let file_path = dir.path().join("test.txt");
{
let mut file = File::create(&file_path).map_err(Error::Io)?;
file.write_all(b"hello").map_err(Error::Io)?;
file.sync_all().map_err(Error::Io)?;
}
let events = rx
.recv_timeout(Duration::from_secs(2))
.map_err(|_| Error::Config("Timeout waiting for watcher event".into()))?;
if events.is_empty() {
return Err(Error::Config("No watcher events received".into()));
}
if !events.iter().any(|p: &PathBuf| p.ends_with("test.txt")) {
return Err(Error::Config("test.txt not found in watcher events".into()));
}
watcher.stop();
Ok(())
}
}