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use {
super::FileSum,
crate::task_sync::Dam,
crossbeam::channel,
rayon::{ThreadPool, ThreadPoolBuilder},
std::{
convert::TryInto,
fs,
path::{Path, PathBuf},
sync::{
atomic::{AtomicIsize, Ordering},
Arc,
},
},
};
#[cfg(unix)]
use {
std::{
collections::HashSet,
os::unix::fs::MetadataExt,
sync::Mutex,
},
};
/// a node id, taking the device into account to be sure to discriminate
/// nodes with the same inode but on different devices
#[derive(Debug, Clone, Copy, PartialEq, Hash, Eq)]
struct NodeId {
/// inode number
inode: u64,
/// device number
dev: u64,
}
// threads used by one computation
const THREADS_COUNT: usize = 6;
/// compute the consolidated numbers for a directory, with implementation
/// varying depending on the OS:
/// On unix, the computation is done on blocks of 512 bytes
/// see https://doc.rust-lang.org/std/os/unix/fs/trait.MetadataExt.html#tymethod.blocks
pub fn compute_dir_sum(path: &Path, dam: &Dam) -> Option<FileSum> {
//debug!("compute size of dir {:?} --------------- ", path);
lazy_static! {
static ref THREAD_POOL: ThreadPool = ThreadPoolBuilder::new()
.num_threads(THREADS_COUNT*2).build().unwrap();
}
// to avoid counting twice a node, we store their id in a set
#[cfg(unix)]
let nodes = Arc::new(Mutex::new(HashSet::<NodeId>::default()));
// this MPMC channel contains the directory paths which must be handled.
// A None means there's nothing left and the thread may send its result and stop
let (dirs_sender, dirs_receiver) = channel::unbounded();
// this MPMC channel is here for the threads to send their results
// at end of computation
let (thread_sum_sender, thread_sum_receiver) = channel::bounded(THREADS_COUNT);
// busy is the number of directories which are either being processed or queued
// We use this count to determine when threads can stop waiting for tasks
let busy = Arc::new(AtomicIsize::new(1));
dirs_sender.send(Some(PathBuf::from(path))).unwrap();
// Each thread does a summation without merge and the data are merged
// at the end (this avoids waiting for a mutex during computation)
for _ in 0..THREADS_COUNT {
let busy = Arc::clone(&busy);
let (dirs_sender, dirs_receiver) = (dirs_sender.clone(), dirs_receiver.clone());
#[cfg(unix)]
let nodes = nodes.clone();
let observer = dam.observer();
let thread_sum_sender = thread_sum_sender.clone();
THREAD_POOL.spawn(move || {
let mut thread_sum = FileSum::zero();
loop {
let o = dirs_receiver.recv();
if let Ok(Some(open_dir)) = o {
if let Ok(entries) = fs::read_dir(&open_dir) {
for e in entries.flatten() {
if let Ok(md) = e.metadata() {
if md.is_dir() {
// we add the directory to the channel of dirs needing
// processing
busy.fetch_add(1, Ordering::Relaxed);
dirs_sender.send(Some(e.path())).unwrap();
} else {
#[cfg(unix)]
if md.nlink() > 1 {
let mut nodes = nodes.lock().unwrap();
let node_id = NodeId {
inode: md.ino(),
dev: md.dev(),
};
if !nodes.insert(node_id) {
// it was already in the set
continue;
}
}
}
#[cfg(unix)]
let size = md.blocks() * 512;
#[cfg(not(unix))]
let size = md.len();
let seconds = extract_seconds(&md);
let entry_sum = FileSum::new(size, false, 1, seconds);
thread_sum += entry_sum;
} else {
// we can't measure much but we can count the file
thread_sum.incr();
}
}
}
busy.fetch_sub(1, Ordering::Relaxed);
}
if observer.has_event() {
dirs_sender.send(None).unwrap(); // to unlock the next waiting thread
break;
}
if busy.load(Ordering::Relaxed) < 1 {
dirs_sender.send(None).unwrap(); // to unlock the next waiting thread
break;
}
}
thread_sum_sender.send(thread_sum).unwrap();
});
}
// Wait for the threads to finish and consolidate their results
let mut sum = compute_file_sum(path);
for _ in 0..THREADS_COUNT {
match thread_sum_receiver.recv() {
Ok(thread_sum) => {
sum += thread_sum;
}
Err(e) => {
warn!("Error while recv summing thread result : {:?}", e);
}
}
}
if dam.has_event() {
return None;
}
Some(sum)
}
/// compute the sum for a regular file (not a folder)
pub fn compute_file_sum(path: &Path) -> FileSum {
match fs::symlink_metadata(path) {
Ok(md) => {
let seconds = extract_seconds(&md);
#[cfg(unix)]
{
let nominal_size = md.size();
let block_size = md.blocks() * 512;
FileSum::new(
block_size.min(nominal_size),
block_size < nominal_size,
1,
seconds,
)
}
#[cfg(not(unix))]
FileSum::new(md.len(), false, 1, seconds)
}
Err(_) => FileSum::new(0, false, 1, 0),
}
}
#[cfg(unix)]
fn extract_seconds(md: &fs::Metadata) -> u32 {
md.mtime().try_into().unwrap_or(0)
}
#[cfg(not(unix))]
fn extract_seconds(md: &fs::Metadata) -> u32 {
if let Ok(st) = md.modified() {
if let Ok(d) = st.duration_since(std::time::UNIX_EPOCH) {
if let Ok(secs) = d.as_secs().try_into() {
return secs
}
}
}
0
}
|
