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// SPDX-License-Identifier: LGPL-3.0-or-later
//
// Copyright 2019 Hristo Venev
#[cfg(unix)]
use std::os::unix::fs::OpenOptionsExt;
use std::path::{Path, PathBuf};
use std::{fs, io, mem};
#[repr(transparent)]
pub struct Temp {
path: PathBuf,
}
impl Drop for Temp {
fn drop(&mut self) {
if self.path.as_os_str().is_empty() {
return;
}
if let Err(err) = fs::remove_file(&self.path) {
eprintln!("<3>Failed to clean up temporary file: {}", err);
}
}
}
impl Temp {
#[inline]
pub fn path(&self) -> &Path {
&self.path
}
#[inline]
pub fn leave(mut self) -> PathBuf {
mem::replace(&mut self.path, PathBuf::new())
}
#[inline]
pub fn rename_to(self, to: impl AsRef<Path>) -> io::Result<()> {
fs::rename(self.leave(), to)
}
}
pub struct Writer {
inner: Temp,
file: fs::File,
}
impl Writer {
pub fn new(path: PathBuf) -> io::Result<Self> {
let mut file = fs::OpenOptions::new();
file.create_new(true);
file.append(true);
#[cfg(unix)]
file.mode(0o0600);
let file = file.open(&path)?;
Ok(Self {
inner: Temp { path },
file,
})
}
pub fn new_in(path: &Path) -> io::Result<Self> {
use rand::RngCore;
let mut rng = rand::thread_rng();
loop {
let i: u64 = rng.next_u64();
let mut p: PathBuf = path.into();
p.push(format!(".tmp.{:16x}", i));
match Self::new(p) {
Ok(v) => return Ok(v),
Err(e) => {
if e.kind() != io::ErrorKind::AlreadyExists {
return Err(e);
}
}
}
}
}
#[inline]
pub fn file(&mut self) -> &mut fs::File {
&mut self.file
}
#[inline]
pub fn sync_done(self) -> io::Result<Temp> {
self.file.sync_data()?;
Ok(self.done())
}
#[inline]
pub fn done(self) -> Temp {
self.inner
}
}
pub fn update(path: &Path, data: &[u8]) -> io::Result<()> {
let mut tmp = Writer::new_in(path.parent().unwrap())?;
io::Write::write_all(tmp.file(), data)?;
tmp.sync_done()?.rename_to(path)
}
#[inline]
pub fn load(path: &impl AsRef<Path>) -> io::Result<Vec<u8>> {
_load(path.as_ref())
}
fn _load(path: &Path) -> io::Result<Vec<u8>> {
let mut file = fs::File::open(&path)?;
let mut data = Vec::new();
io::Read::read_to_end(&mut file, &mut data)?;
Ok(data)
}
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