48 lines
1.4 KiB
Rust
48 lines
1.4 KiB
Rust
use std::ffi::{OsStr, OsString};
|
|
use std::path::{Path, PathBuf};
|
|
use std::{io, iter::repeat_with};
|
|
|
|
use crate::error::IoResultExt;
|
|
|
|
fn tmpname(prefix: &OsStr, suffix: &OsStr, rand_len: usize) -> OsString {
|
|
let mut buf = OsString::with_capacity(prefix.len() + suffix.len() + rand_len);
|
|
buf.push(prefix);
|
|
let mut char_buf = [0u8; 4];
|
|
for c in repeat_with(fastrand::alphanumeric).take(rand_len) {
|
|
buf.push(c.encode_utf8(&mut char_buf));
|
|
}
|
|
buf.push(suffix);
|
|
buf
|
|
}
|
|
|
|
pub fn create_helper<R>(
|
|
base: &Path,
|
|
prefix: &OsStr,
|
|
suffix: &OsStr,
|
|
random_len: usize,
|
|
mut f: impl FnMut(PathBuf) -> io::Result<R>,
|
|
) -> io::Result<R> {
|
|
let num_retries = if random_len != 0 {
|
|
crate::NUM_RETRIES
|
|
} else {
|
|
1
|
|
};
|
|
|
|
for _ in 0..num_retries {
|
|
let path = base.join(tmpname(prefix, suffix, random_len));
|
|
return match f(path) {
|
|
Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists && num_retries > 1 => continue,
|
|
// AddrInUse can happen if we're creating a UNIX domain socket and
|
|
// the path already exists.
|
|
Err(ref e) if e.kind() == io::ErrorKind::AddrInUse && num_retries > 1 => continue,
|
|
res => res,
|
|
};
|
|
}
|
|
|
|
Err(io::Error::new(
|
|
io::ErrorKind::AlreadyExists,
|
|
"too many temporary files exist",
|
|
))
|
|
.with_err_path(|| base)
|
|
}
|