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use std::collections::HashMap;
#[derive(Debug, Default, Clone)]
pub struct InodeFilter {
inner: HashMap<(u64, u64), u64>,
}
impl InodeFilter {
#[cfg(unix)]
pub fn add(&mut self, metadata: &std::fs::Metadata) -> bool {
use std::os::unix::fs::MetadataExt;
self.add_dev_inode((metadata.dev(), metadata.ino()), metadata.nlink())
}
#[cfg(windows)]
pub fn add(&mut self, metadata: &std::fs::Metadata) -> bool {
use std::os::windows::fs::MetadataExt;
if let (Some(dev), Some(inode), Some(nlinks)) = (
metadata.volume_serial_number(),
metadata.file_index(),
metadata.number_of_links(),
) {
self.add_dev_inode((dev as u64, inode), nlinks as u64)
} else {
true
}
}
#[cfg(not(any(unix, windows)))]
pub fn add(&mut self, metadata: &std::fs::Metadata) -> bool {
true
}
pub fn add_dev_inode(&mut self, dev_inode: (u64, u64), nlinks: u64) -> bool {
if nlinks <= 1 {
return true;
}
match self.inner.get_mut(&dev_inode) {
Some(1) => {
self.inner.remove(&dev_inode);
false
}
Some(count) => {
*count -= 1;
false
}
None => {
self.inner.insert(dev_inode, nlinks - 1);
true
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_filters_inodes() {
let mut inodes = InodeFilter::default();
assert!(inodes.add_dev_inode((1, 1), 2));
assert!(inodes.add_dev_inode((2, 1), 2));
assert!(!inodes.add_dev_inode((1, 1), 2));
assert!(!inodes.add_dev_inode((2, 1), 2));
assert!(inodes.add_dev_inode((1, 1), 3));
assert!(!inodes.add_dev_inode((1, 1), 3));
assert!(!inodes.add_dev_inode((1, 1), 3));
assert!(inodes.add_dev_inode((1, 1), 1));
assert!(inodes.add_dev_inode((1, 1), 1));
}
}
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