added max threads

Cargo.toml

@@ -24,3 +24,4 @@ futures = { version = "0.3", optional = true }
 lazy_static = "1.4"
 chrono = "0.4"
 shellexpand = "1.1"
+# cfg_if = "0.1"

src/arg.rs

@@ -37,6 +37,12 @@ pub fn usage() -> !
     println!("  --cancel -w\t\tAlias for `--error-mode CANCEL`");
     println!("  --error -W\t\tAlias for `--error-mode TERMINATE`");
     println!("  --recurse <max>|inf\tRecursive mode, give max depth or infinite.");
+    #[cfg(feature="threads")]
+    println!("  --threads <max>|inf\tMax number of threads to run at once.");
+    #[cfg(feature="threads")]
+    println!("    -U\t\tUlimited max threads.");
+    #[cfg(feature="threads")]
+    println!("  --sync -S\t\tRun only one file at a time.");
     println!("  --\t\t\tStop reading args");
     println!("Other:");
     println!("  --help -h:\t\tPrint this message");
@@ -120,6 +126,9 @@ where I: IntoIterator<Item=String>
     Ok(config::Rebase{
 	save: files.clone(), //TODO: Seperate save+loads
 	load: files,
+
+	#[cfg(feature="threads")]
+	max_threads: config::MAX_THREADS,
     })
 }
 
@@ -138,6 +147,9 @@ where I: IntoIterator<Item=String>
     let mut mode_rec = config::RecursionMode::None;
     let mut mode_log = log::Mode::Warn;
 
+    #[cfg(feature="threads")]
+    let mut threads = config::MAX_THREADS;
+    
     macro_rules! push {
 	($arg:expr) => {
 	    {
@@ -167,6 +179,16 @@ where I: IntoIterator<Item=String>
 		
 		"--" => reading = false,
 
+		#[cfg(feature="threads")]
+		"--threads" if take_one!() => {
+		    if one.to_lowercase().trim() == "inf" {
+			threads = None;
+		    } else {
+			threads = Some(one.as_str().parse::<std::num::NonZeroUsize>().or_else(|e| Err(Error::BadNumber(e)))?);
+		    }
+		},
+		#[cfg(feature="threads")]
+		"--sync" => threads = Some(unsafe{std::num::NonZeroUsize::new_unchecked(1)}),
 		"--load"  => {
 		    load.push(validate_path(config::DEFAULT_HASHNAME.to_string(), Ensure::File, false)?.to_owned());
 		},
@@ -226,6 +248,11 @@ where I: IntoIterator<Item=String>
 
 			    'h' => return Ok(Output::Help),
 			    
+			    #[cfg(feature="threads")]
+			    'U' => threads = None,
+			    #[cfg(feature="threads")]
+			    'S' => threads = Some(unsafe{std::num::NonZeroUsize::new_unchecked(1)}),
+			    
 			    'r' => mode_rec = config::RecursionMode::All,
 			    _ => return Err(Error::UnknownArgChar(argchar)),
 			}
@@ -257,6 +284,8 @@ where I: IntoIterator<Item=String>
 	},
 	save,
 	load,
+	#[cfg(feature="threads")]
+	max_threads: threads,
     }))
 }
 
@@ -271,6 +300,7 @@ pub enum Error
     ExpectedFile(PathBuf),
     ExpectedDirectory(PathBuf),
     UnknownErrorMode(String),
+    BadNumber(std::num::ParseIntError),
     Unknown,
 }
 
@@ -281,6 +311,7 @@ impl fmt::Display for Error
     {
 	write!(f, "failed to parse args: ")?;
 	match self {
+	    Error::BadNumber(num) => write!(f, "{}", num),
 	    Error::NoInput => write!(f, "need at least one input"),
 	    Error::Parse(value, typ) => write!(f, "expected a {}, got `{}'", typ, value),
 	    Error::UnknownArg(arg) => write!(f, "i don't know how to `{}'", arg),

src/config.rs

@@ -1,6 +1,9 @@
 use super::*;
 use lazy_static::lazy_static;
 
+#[cfg(feature="threads")]
+use std::num::NonZeroUsize;
+
 #[derive(Debug, Clone)]
 pub enum RecursionMode
 {
@@ -53,6 +56,10 @@ fn expand_path(path: impl AsRef<str>) -> String
     shellexpand::tilde(path.as_ref()).to_string()
 }
 
+/// Default max threads, `None` for unlimited.
+#[cfg(feature="threads")]
+pub const MAX_THREADS: Option<NonZeroUsize> = Some(unsafe{NonZeroUsize::new_unchecked(10)});
+
 #[derive(Debug)]
 pub struct Config
 {
@@ -64,6 +71,9 @@ pub struct Config
     pub save: Vec<String>,
     /// Load hashes from
     pub load: Vec<String>,
+    /// Max number of threads to spawn
+    #[cfg(feature="threads")]
+    pub max_threads: Option<NonZeroUsize>, //TODO: Implement
 }
 
 #[derive(Debug)]
@@ -73,4 +83,7 @@ pub struct Rebase
     pub load: Vec<String>,
     /// Rebase to here
     pub save: Vec<String>,
+    /// Max number of threads to spawn
+    #[cfg(feature="threads")]
+    pub max_threads: Option<NonZeroUsize>, //TODO: Implement
 }

src/main.rs

@@ -80,7 +80,7 @@ fn absolute(path: impl AsRef<std::path::Path>) -> std::path::PathBuf
 }
 
 #[cfg(feature="threads")]
-async fn rebase_one_async(path: impl AsRef<std::path::Path>, hash: hash::Sha256Hash) -> Result<Option<(std::path::PathBuf, hash::Sha256Hash)>, error::Error>
+async fn rebase_one_async(path: impl AsRef<std::path::Path>, hash: hash::Sha256Hash, semaphore: Option<std::sync::Arc<tokio::sync::Semaphore>>) -> Result<Option<(std::path::PathBuf, hash::Sha256Hash)>, error::Error>
 {
     use std::{
 	convert::TryInto,
@@ -91,6 +91,10 @@ async fn rebase_one_async(path: impl AsRef<std::path::Path>, hash: hash::Sha256H
 	},
     };
     let path = path.as_ref();
+    let _lock = match semaphore {
+	Some(sem) => Some(sem.acquire_owned().await),
+	None => None,
+    };
     let mut file = OpenOptions::new()
 	.read(true)
 	.open(path).await?;
@@ -113,11 +117,13 @@ async fn rebase(config: config::Rebase) -> Result<(), Box<dyn std::error::Error>
 	path::{
 	    Path,
 	},
+	sync::Arc,
     };
     use tokio::{
 	fs::{
 	    OpenOptions,
 	},
+	sync::Semaphore,
     };
     let mut hashes = container::DupeMap::new();
     for (transient, load) in config.load.iter().map(|x| (false, x)).chain(config.save.iter().map(|x| (true, x)))
@@ -140,6 +146,7 @@ async fn rebase(config: config::Rebase) -> Result<(), Box<dyn std::error::Error>
 
     let mut remove = Vec::new();
     let mut children = Vec::with_capacity(hashes.cache_len());
+    let semaphore = config.max_threads.map(|num| Arc::new(Semaphore::new(num.into())));
     for (path, (hash, trans)) in hashes.cache_iter()
     {
 	if !trans { //Don't rebuild transient ones, this is desired I think? Maybe not... Dunno.
@@ -147,8 +154,9 @@ async fn rebase(config: config::Rebase) -> Result<(), Box<dyn std::error::Error>
 		//Getting hash
 		let path = path.clone();
 		let hash = *hash;
+		let semaphore = semaphore.as_ref().map(|semaphore| Arc::clone(semaphore));
 		children.push(tokio::task::spawn(async move {
-		    rebase_one_async(path, hash).await
+		    rebase_one_async(path, hash, semaphore).await
 		}));
 	    } else {
 		remove.push(path.clone());
@@ -266,6 +274,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>>
 	    log!(Debug, lmode => "Loaded hashes: {}", hashes);
 	    log!(Info, lmode => "Starting checks (threaded)");
 	    let hashes = Arc::new(Mutex::new(hashes));
+	    let semaphore = args.max_threads.map(|num| Arc::new(tokio::sync::Semaphore::new(num.into())));
 	    for path in args.paths.iter()
 	    {
 		let path = Path::new(path);
@@ -274,9 +283,10 @@ async fn main() -> Result<(), Box<dyn std::error::Error>>
 		    let mode = args.mode.clone();
 		    let path = absolute(&path);
 		    let hashes= Arc::clone(&hashes);
+		    let semaphore = semaphore.as_ref().map(|sem| Arc::clone(sem));
 		    children.push(tokio::task::spawn(async move {
 			log!(Debug, mode.logging_mode => " + {:?}", path);
-			let res = mode.error_mode.handle(proc::do_dir_async(path.clone(), 0, hashes, mode.clone()).await).log_and_forget(&mode.logging_mode, log::Level::Error);
+			let res = mode.error_mode.handle(proc::do_dir_async(path.clone(), 0, hashes, mode.clone(), semaphore).await).log_and_forget(&mode.logging_mode, log::Level::Error);
 			log!(Info, mode.logging_mode => " - {:?}", path);
 			res
 		    }));

src/proc.rs

@@ -121,7 +121,7 @@ pub fn process_file<P: AsRef<Path>>(path: P, set: &mut container::DupeMap) -> Re
 
 /// Process a file and add it to the table, returns true if is not a dupe.
 #[cfg(feature="threads")]
-pub async fn process_file_async<P: AsRef<Path>>(path: P, set: &std::sync::Arc<tokio::sync::Mutex<container::DupeMap>>) -> Result<bool, error::Error>
+pub async fn process_file_async<P: AsRef<Path>>(path: P, set: &std::sync::Arc<tokio::sync::Mutex<container::DupeMap>>, sem: Option<std::sync::Arc<tokio::sync::Semaphore>>) -> Result<bool, error::Error>
 {
     use tokio::{
 	fs::{
@@ -136,6 +136,10 @@ pub async fn process_file_async<P: AsRef<Path>>(path: P, set: &std::sync::Arc<to
 	let mut set = set.lock().await;
 	Ok(set.try_add(hash))
     } else {
+	let _lock = match sem {
+	    Some(sem) => Some(sem.acquire_owned().await),
+	    None => None,
+	};
 	let mut file = OpenOptions::new()
 	    .read(true)
 	    .open(path).await?;
@@ -186,7 +190,7 @@ pub fn do_dir<P: AsRef<Path>>(dir: P, depth: usize, set: &mut container::DupeMap
 
 /// Walk a dir structure and remove all dupes in it
 #[cfg(feature="threads")]
-pub fn do_dir_async<P: AsRef<Path> + std::marker::Send + std::marker::Sync + 'static>(dir: P, depth: usize, set: std::sync::Arc<tokio::sync::Mutex<container::DupeMap>>, mode: config::Mode) -> futures::future::BoxFuture<'static, Result<DupeCount, error::Error>>
+pub fn do_dir_async<P: AsRef<Path> + std::marker::Send + std::marker::Sync + 'static>(dir: P, depth: usize, set: std::sync::Arc<tokio::sync::Mutex<container::DupeMap>>, mode: config::Mode, semaphore: Option<std::sync::Arc<tokio::sync::Semaphore>>) -> futures::future::BoxFuture<'static, Result<DupeCount, error::Error>>
 {
     use std::sync::Arc;
     use futures::future::{
@@ -213,9 +217,10 @@ pub fn do_dir_async<P: AsRef<Path> + std::marker::Send + std::marker::Sync + 'st
 		let set = Arc::clone(&set);
 		let cmode = cmode.clone();
 		let mode = mode.clone();
+		let semaphore = semaphore.as_ref().map(|sem| Arc::clone(sem));
 		children.push(tokio::task::spawn(async move {
 		    log!(Info, cmode.logging_mode => "OK {:?}", obj);
-		    match mode.handle(do_dir_async(obj, depth+1, set, cmode).await) {
+		    match mode.handle(do_dir_async(obj, depth+1, set, cmode, semaphore).await) {
 			Ok(v) => Ok(v.unwrap_or_default()),
 			Err(v) => Err(v),
 		    }
@@ -224,8 +229,9 @@ pub fn do_dir_async<P: AsRef<Path> + std::marker::Send + std::marker::Sync + 'st
 		let set = Arc::clone(&set);
 		let mode = mode.clone();
 		let cmode = cmode.clone();
+		let semaphore = semaphore.as_ref().map(|sem| Arc::clone(sem));
 		workers.push(tokio::task::spawn(async move {
-		    match mode.handle(process_file_async(&obj, &set).await) {
+		    match mode.handle(process_file_async(&obj, &set, semaphore).await) {
 			Ok(v) => {
 			    if v.unwrap_or_default() {
 				log!(Info, cmode.logging_mode => "OK {:?}", obj);