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use std::ffi::OsString;
#[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;
}
fs::remove_file(&self.path).expect("Failed to clean up temporary file");
}
}
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,
})
}
#[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.inner)
}
#[inline]
pub fn done(self) -> Temp {
self.inner
}
}
pub fn update(path: &Path, data: &[u8]) -> io::Result<()> {
let mut tmp = OsString::from(path);
tmp.push(".tmp");
let mut tmp = Writer::new(PathBuf::from(tmp))?;
io::Write::write_all(tmp.file(), data)?;
tmp.sync_done()?.rename_to(path)
}
pub fn load(path: &Path) -> io::Result<Option<Vec<u8>>> {
let mut file = match fs::File::open(&path) {
Ok(file) => file,
Err(e) => {
if e.kind() == io::ErrorKind::NotFound {
return Ok(None);
}
return Err(e);
}
};
let mut data = Vec::new();
io::Read::read_to_end(&mut file, &mut data)?;
Ok(Some(data))
}
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