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parallel: bare bones i guess

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master
Avril 4 years ago
parent 7d384f96c9
commit 30a380e7ec
Signed by: flanchan
GPG Key ID: 284488987C31F630
8 changed files with 716 additions and 34 deletions
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367
Cargo.lock generated
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@ -1,11 +1,66 @@
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
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"gimli",
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"libc",
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@ -24,6 +79,42 @@ version = "0.1.10"
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@ -46,11 +137,106 @@ version = "0.3.3"
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"futures-channel",
"futures-core",
"futures-executor",
"futures-io",
"futures-sink",
"futures-task",
"futures-util",
]
[[package]]
name = "futures-channel"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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"futures-channel",
"futures-core",
"futures-io",
"futures-macro",
"futures-sink",
"futures-task",
"memchr",
"pin-project",
"pin-utils",
"proc-macro-hack",
"proc-macro-nested",
"slab",
]
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name = "hermit-abi"
@ -61,6 +247,21 @@ dependencies = [
"libc",
]
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name = "humantime"
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"quick-error",
]
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@ -107,6 +308,16 @@ version = "2.3.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"adler",
"autocfg",
]
[[package]]
name = "mio"
version = "0.6.22"
@ -192,12 +403,78 @@ dependencies = [
"libc",
]
[[package]]
name = "object"
version = "0.20.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"log",
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name = "proc-macro-hack"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "proc-macro-nested"
version = "0.1.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "proc-macro2"
version = "1.0.24"
@ -207,6 +484,12 @@ dependencies = [
"unicode-xid",
]
[[package]]
name = "quick-error"
version = "1.2.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "quote"
version = "1.0.7"
@ -222,11 +505,64 @@ version = "0.1.57"
source = "registry+https://github.com/rust-lang/crates.io-index"
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"aho-corasick",
"memchr",
"regex-syntax",
"thread_local",
]
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"cfg-if",
"color-eyre",
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"rustc_version",
"tokio",
]
@ -269,6 +605,24 @@ dependencies = [
"unicode-xid",
]
[[package]]
name = "termcolor"
version = "1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "tokio"
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@ -338,6 +692,15 @@ version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"winapi 0.3.9",
]
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name = "winapi-x86_64-pc-windows-gnu"
version = "0.4.0"

11
Cargo.toml
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@ -8,7 +8,9 @@ edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[features]
parallel = ["tokio"]
default = ["parallel"]
parallel = ["tokio", "futures"]
threads = ["parallel", "tokio/rt-threaded"]
# use PRETTY_ENV_LOGGER I guess
@ -18,3 +20,10 @@ threads = ["parallel", "tokio/rt-threaded"]
[dependencies]
cfg-if = "0.1.10"
tokio = {version = "0.2", features = ["full"], optional = true}
log = "0.4.11"
pretty_env_logger = "0.4.0"
color-eyre = {version = "0.5.6", default-features=false}
futures = {version = "0.3.5", optional = true}
[build-dependencies]
rustc_version = "0.2"

24
build.rs
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@ -0,0 +1,24 @@
extern crate rustc_version;
use rustc_version::{version, version_meta, Channel};
fn main() {
// Assert we haven't travelled back in time
assert!(version().unwrap().major >= 1);
// Set cfg flags depending on release channel
match version_meta().unwrap().channel {
Channel::Stable => {
println!("cargo:rustc-cfg=stable");
}
Channel::Beta => {
println!("cargo:rustc-cfg=beta");
}
Channel::Nightly => {
println!("cargo:rustc-cfg=nightly");
}
Channel::Dev => {
println!("cargo:rustc-cfg=dev");
}
}
}

94
src/error.rs
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@ -0,0 +1,94 @@
use super::*;
use std::{
error, fmt,
io,
path::{PathBuf, Path,}
};
#[derive(Debug)]
#[non_exhaustive]
pub enum ErrorKind
{
Stat(io::Error),
Open(io::Error),
Copy(io::Error),
}
impl ErrorKind
{
pub fn is_skippable(&self) -> bool
{
match self {
Self::Stat(_) => true,
_ => false,
}
}
pub fn suggestion(&self) -> &'static str
{
//TODO: Maybe?
match self {
_ => "Are you sure file exists, and you have write privilages here?"
}
}
}
#[derive(Debug)]
pub struct Error {
kind: ErrorKind,
path: PathBuf,
}
impl<P: AsRef<Path>> From<(ErrorKind, P)> for Error
{
fn from((kind, p): (ErrorKind, P)) -> Self
{
Self::new(kind, p.as_ref())
}
}
impl Error
{
pub fn new(kind: ErrorKind, path: impl Into<PathBuf>) -> Self
{
Self {
kind,
path: path.into()
}
}
pub fn path(&self) -> &Path
{
self.path.as_ref()
}
pub fn kind(&self) -> &ErrorKind
{
&self.kind
}
}
impl std::error::Error for Error
{
fn source(&self) -> Option<&(dyn error::Error + 'static)>
{
Some(match &self.kind {
ErrorKind::Stat(io) => io,
ErrorKind::Open(io) => io,
ErrorKind::Copy(io) => io,
// _ => return None,
})
}
}
impl std::fmt::Display for Error
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
{
match &self.kind {
ErrorKind::Stat(_) => write!(f, "Failed to stat file {:?}", self.path),
ErrorKind::Open(_) => write!(f, "Failed to open file {:?}", self.path),
ErrorKind::Copy(_) => write!(f, "Failed to create copy of file {:?}", self.path),
}
}
}

60
src/macros.rs
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@ -0,0 +1,60 @@
#![allow(unused_macros)]
/// Run something as async or or depending on feature flag `parallel`
macro_rules! sync
{
(if {$($if:tt)*} else {$($else:tt)*}) => {
cfg_if::cfg_if! {
if #[cfg(feature="parallel")] {
$($if)*
} else {
$($else)*
}
}
};
(if {$($if:tt)*}) => {
cfg_if::cfg_if! {
if #[cfg(feature="parallel")] {
$($if)*
}
}
};
(else {$($if:tt)*}) => {
cfg_if::cfg_if! {
if #[cfg(not(eature="parallel"))] {
$($if)*
}
}
};
}
#[macro_export] macro_rules! reyre {
(m {$($body:tt)*} $lit:literal $($tt:tt)*) => {
{
let cls = move || {
$($body)*
};
$crate::reyre!{
cls(), $lit $($tt)*
}
}
};
({$($body:tt)*} $lit:literal $($tt:tt)*) => {
{
let cls = || {
$($body)*
};
$crate::reyre!{
cls(), $lit $($tt)*
}
}
};
($expr:expr, $lit:literal $($tt:tt)*) => {
{
use ::color_eyre::eyre::WrapErr;
$expr.wrap_err_with(|| ::color_eyre::eyre::eyre!($lit $($tt)*))
}
}
}

55
src/main.rs
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@ -1,42 +1,39 @@
#![allow(dead_code)]
/// Run something as async or or depending on feature flag `parallel`
macro_rules! sync
{
(if {$($if:tt)*} else {$($else:tt)*}) => {
cfg_if::cfg_if! {
if #[cfg(feature="parallel")] {
$($if)*
} else {
$($else)*
}
}
};
#[macro_use] extern crate log;
#[macro_use] mod macros;
(if {$($if:tt)*}) => {
cfg_if::cfg_if! {
if #[cfg(feature="parallel")] {
$($if)*
}
}
use color_eyre::{
eyre::{self, eyre, WrapErr},
Help, SectionExt,
};
(else {$($if:tt)*}) => {
cfg_if::cfg_if! {
if #[cfg(not(eature="parallel"))] {
$($if)*
}
}
};
fn init() -> eyre::Result<()>
{
color_eyre::install()?;
pretty_env_logger::init(); //TODO: Change to builder
trace!("Initialised");
Ok(())
}
mod error;
#[cfg(feature="parallel")]
mod parallel;
#[cfg(feature="parallel")]
#[cfg_attr(feature="parallel", tokio::main)]
async fn main() {
println!("Hello world!")
async fn main() -> eyre::Result<()> {
reyre!(init(), "Failed to initialise")?;
reyre!(parallel::main(std::env::args().skip(1)).await, "Jobs failed")
}
#[cfg(not(feature="parallel"))]
mod serial;
#[cfg(not(feature="parallel"))]
fn main() {
println!("Hello world! sync")
fn main() -> eyre::Result<()> {
reyre!(init(), "Failed to initialise")?;
todo!("Sync unimplemented")
}

132
src/parallel.rs
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@ -0,0 +1,132 @@
//! Async operations
use super::*;
use std::{
num::NonZeroUsize,
convert::{TryFrom, TryInto,},
path::Path,
sync::Arc,
};
use futures::{
future::{
OptionFuture,
FutureExt,
join_all,
},
};
use tokio::{
sync::{
Semaphore,
},
fs::{
OpenOptions,
File,
self,
},
};
use error::{Error, ErrorKind};
const MAX_WORKERS: Option<NonZeroUsize> = Some(unsafe {NonZeroUsize::new_unchecked(4096)});
fn gensem() -> Option<Arc<Semaphore>>
{
trace!("Limiting concurrency to {:?}", MAX_WORKERS);
match MAX_WORKERS {
Some(nz) => Some(Arc::new(Semaphore::new(nz.into()))),
None => None,
}
}
fn tpath() -> String
{
todo!();
".test.tmp".to_owned()
}
async fn unlink(path: &Path) -> Result<(), Error>
{
let tmp = path.parent().unwrap().join(tpath());
fs::copy(path, tmp).await.map_err(|e| Error::new(ErrorKind::Copy(e), path.to_owned()))?;
todo!();
Ok(())
}
async fn work<P: AsRef<Path>>(apath: P, sem: Option<Arc<Semaphore>>) -> Result<(P, bool), Error>
{
let path = apath.as_ref();
let _lock = OptionFuture::from(sem.map(Semaphore::acquire_owned)).await;
let file = OpenOptions::new()
.read(true)
.open(path).await
.map_err(|e| (ErrorKind::Open(e), path))?;
let meta = match file.metadata().await {
Ok(meta) => meta,
Err(err) => {
debug!("Failed to stat file: {}", err);
warn!("Failed to stat {:?}, skipping", path);
return Err((ErrorKind::Stat(err), path).into());
},
};
use std::os::unix::fs::MetadataExt;
let nlink = meta.nlink();
trace!("<{:?}> Links: {}", path, nlink);
if nlink > 1 {
//todo work i guess fuck it
unlink(path).await?;
Ok((apath, true))
} else {
Ok((apath, false))
}
}
pub async fn main<I: IntoIterator<Item=String>>(list: I) -> eyre::Result<()>
{
let sem = gensem();
let mut failures = 0usize;
for (i, res) in (0usize..).zip(join_all(list.into_iter().map(|file| tokio::spawn(work(file, sem.clone()))))
.map(|x| {trace!("--- {} Finished ---", x.len()); x}).await)
{
//trace!("Done on {:?}", res);
match res {
Ok(Ok((path, true))) => info!("<{:?}> OK (processed)", path),
Ok(Ok((path, false))) => info!("<{:?}> OK (skipped)", path),
Err(e) => {
trace!("child {} cancelled by {}", i, if e.is_panic(){"panic"} else {"cancel"});
if e.is_panic() {
return Err(eyre!("Child {} panic", i))
.with_error(move || e)
.with_warning(|| "This suggests a bug in the program");
} else {
warn!("Child {} cancelled", i);
failures += 1;
}
},
Ok(Err(kind)) if !kind.kind().is_skippable() => { //
let fuck = format!("{:?}", kind.path());
let sug = kind.kind().suggestion();
let err = Err::<std::convert::Infallible, _>(kind)
.wrap_err_with(|| eyre!("<{}> Failed", fuck))
.with_section(move || fuck.header("Path was"))
.with_suggestion(|| sug)
.unwrap_err();
error!("{}", err);
debug!("Error: {:?}", err);
failures += 1;
},
Ok(Err(k)) => {
trace!("<{:?}> Failed (skipped)", k.path());
failures+=1;
},
}
}
if failures > 0 {
return Err(eyre!("Some tasks failed to complete successfullly"))
.with_section(|| failures.to_string().header("Number of failed tasks"))
.with_suggestion(|| "Run with `RUST_LOG=debug` or `RUST_LOG=trace` for verbose error reporting");
}
Ok(())
}

3
src/serial.rs
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@ -0,0 +1,3 @@
//! Sync operations
use super::*;
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