#![allow(non_upper_case_globals, dead_code)]
extern crate fsevent as fse;
use fsevent_sys::core_foundation as cf;
use fsevent_sys::fsevent as fs;
use std::slice;
use std::mem::transmute;
use std::slice::from_raw_parts_mut;
use std::str::from_utf8;
use std::ffi::CStr;
use std::convert::AsRef;
use std::thread;
use std::sync::mpsc::{channel, Sender, Receiver};
use super::{Error, Event, op, Watcher};
use std::path::{Path, PathBuf};
use libc;
pub struct FsEventWatcher {
paths: cf::CFMutableArrayRef,
since_when: fs::FSEventStreamEventId,
latency: cf::CFTimeInterval,
flags: fs::FSEventStreamCreateFlags,
sender: Sender<Event>,
runloop: Option<usize>,
context: Option<Box<StreamContextInfo>>,
}
fn translate_flags(flags: fse::StreamFlags) -> op::Op {
let mut ret = op::Op::empty();
if flags.contains(fse::ITEM_XATTR_MOD) {
ret.insert(op::CHMOD);
}
if flags.contains(fse::ITEM_CREATED) {
ret.insert(op::CREATE);
}
if flags.contains(fse::ITEM_REMOVED) {
ret.insert(op::REMOVE);
}
if flags.contains(fse::ITEM_RENAMED) {
ret.insert(op::RENAME);
}
if flags.contains(fse::ITEM_MODIFIED) {
ret.insert(op::WRITE);
}
ret
}
struct StreamContextInfo {
sender: Sender<Event>,
done: Receiver<()>
}
impl FsEventWatcher {
#[inline]
pub fn is_running(&self) -> bool {
self.runloop.is_some()
}
pub fn stop(&mut self) {
if !self.is_running() {
return;
}
if let Some(runloop) = self.runloop {
unsafe {
let runloop = runloop as *mut libc::c_void;
cf::CFRunLoopStop(runloop);
}
}
self.runloop = None;
if let Some(ref context_info) = self.context {
match context_info.done.recv() {
Ok(()) => (),
Err(_) => panic!("the runloop may not be finished!"),
}
}
self.context = None;
}
fn remove_path(&mut self, source: &str) {
unsafe {
let cf_path = cf::str_path_to_cfstring_ref(source);
for idx in 0 .. cf::CFArrayGetCount(self.paths) {
let item = cf::CFArrayGetValueAtIndex(self.paths, idx);
if cf::CFStringCompare(item, cf_path, cf::kCFCompareCaseInsensitive) == cf::kCFCompareEqualTo {
cf::CFArrayRemoveValueAtIndex(self.paths, idx);
}
}
}
}
fn append_path(&mut self, source: &str) {
unsafe {
let cf_path = cf::str_path_to_cfstring_ref(source);
cf::CFArrayAppendValue(self.paths, cf_path);
cf::CFRelease(cf_path);
}
}
pub fn run(&mut self) -> Result<(), Error> {
if unsafe { cf::CFArrayGetCount(self.paths) } == 0 {
return Err(Error::PathNotFound);
}
let (done_tx, done_rx) = channel();
let info = StreamContextInfo {
sender: self.sender.clone(),
done: done_rx
};
self.context = Some(Box::new(info));
let stream_context = fs::FSEventStreamContext{
version: 0,
info: unsafe { transmute(self.context.as_ref().map(|ctx| & **ctx)) },
retain: cf::NULL,
copy_description: cf::NULL };
let cb = callback as *mut _;
let stream = unsafe { fs::FSEventStreamCreate(cf::kCFAllocatorDefault,
cb,
&stream_context,
self.paths,
self.since_when,
self.latency,
self.flags) };
let dummy = stream as usize;
let (rl_tx, rl_rx) = channel();
thread::spawn(move || {
let stream = dummy as *mut libc::c_void;
unsafe {
let cur_runloop = cf::CFRunLoopGetCurrent();
fs::FSEventStreamScheduleWithRunLoop(stream, cur_runloop, cf::kCFRunLoopDefaultMode);
fs::FSEventStreamStart(stream);
rl_tx.send(cur_runloop as *mut libc::c_void as usize).ok().expect("Unable to send runloop to watcher");
cf::CFRunLoopRun();
fs::FSEventStreamStop(stream);
fs::FSEventStreamInvalidate(stream);
fs::FSEventStreamRelease(stream);
}
done_tx.send(()).ok().expect("error while signal run loop is done");
});
self.runloop = Some(rl_rx.recv().unwrap());
Ok(())
}
}
#[allow(unused_variables)]
pub unsafe extern "C" fn callback(
stream_ref: fs::FSEventStreamRef,
info: *mut libc::c_void,
num_events: libc::size_t, event_paths: *const *const libc::c_char, event_flags: *mut libc::c_void, event_ids: *mut libc::c_void, ) {
let num = num_events as usize;
let e_ptr = event_flags as *mut u32;
let i_ptr = event_ids as *mut u64;
let info = transmute::<_, *const StreamContextInfo>(info);
let paths: &[*const libc::c_char] = transmute(slice::from_raw_parts(event_paths, num));
let flags = slice::from_raw_parts_mut(e_ptr, num);
let ids = slice::from_raw_parts_mut(i_ptr, num);
for p in (0..num) {
let i = CStr::from_ptr(paths[p]).to_bytes();
let flag = fse::StreamFlags::from_bits(flags[p] as u32)
.expect(format!("Unable to decode StreamFlags: {}", flags[p] as u32).as_ref());
let path = PathBuf::from(from_utf8(i).ok().expect("Invalid UTF8 string."));
let event = Event{op: Ok(translate_flags(flag)), path: Some(path)};
(*info).sender.send(event).ok().expect("error while sending event");
}
}
impl Watcher for FsEventWatcher {
fn new(tx: Sender<Event>) -> Result<FsEventWatcher, Error> {
Ok(FsEventWatcher {
paths: unsafe { cf::CFArrayCreateMutable(cf::kCFAllocatorDefault, 0, &cf::kCFTypeArrayCallBacks) },
since_when: fs::kFSEventStreamEventIdSinceNow,
latency: 0.0,
flags: fs::kFSEventStreamCreateFlagFileEvents | fs::kFSEventStreamCreateFlagNoDefer,
sender: tx,
runloop: None,
context: None,
})
}
fn watch<P: AsRef<Path>>(&mut self, path: P) -> Result<(), Error> {
self.stop();
self.append_path(&path.as_ref().to_str().unwrap());
self.run()
}
fn unwatch<P: AsRef<Path>>(&mut self, path: P) -> Result<(), Error> {
self.stop();
self.remove_path(&path.as_ref().to_str().unwrap());
let _ = self.run();
Ok(())
}
}
impl Drop for FsEventWatcher {
fn drop(&mut self) {
self.stop();
unsafe {
cf::CFRelease(self.paths);
}
}
}
#[test]
fn test_fsevent_watcher_drop() {
use super::*;
let (tx, rx) = channel();
{
let mut watcher: RecommendedWatcher = Watcher::new(tx).unwrap();
watcher.watch("../../").unwrap();
thread::sleep_ms(2_000);
println!("is running -> {}", watcher.is_running());
thread::sleep_ms(1_000);
watcher.unwatch("../..").unwrap();
println!("is running -> {}", watcher.is_running());
}
thread::sleep_ms(1_000);
for e in rx.iter() {
println!("debug => {:?} {:?}", e.op.map(|e| e.bits()).unwrap_or(0), e.path);
}
println!("in test: {} works", file!());
}