300 lines
9.1 KiB
Rust
300 lines
9.1 KiB
Rust
use failure::*;
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use std::path::{Path, PathBuf};
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use std::io::Write;
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use std::time::Duration;
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use crypto::digest::Digest;
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use crypto::sha2::Sha512Trunc256;
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use std::sync::Mutex;
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use std::fs::File;
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use std::os::unix::io::AsRawFd;
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use crate::tools;
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pub struct ChunkStore {
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name: String, // used for error reporting
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base: PathBuf,
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chunk_dir: PathBuf,
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hasher: Sha512Trunc256,
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mutex: Mutex<bool>,
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_lockfile: File,
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}
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const HEX_CHARS: &'static [u8; 16] = b"0123456789abcdef";
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pub fn digest_to_hex(digest: &[u8]) -> String {
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let mut buf = Vec::<u8>::with_capacity(digest.len()*2);
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for i in 0..digest.len() {
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buf.push(HEX_CHARS[(digest[i] >> 4) as usize]);
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buf.push(HEX_CHARS[(digest[i] & 0xf) as usize]);
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}
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unsafe { String::from_utf8_unchecked(buf) }
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}
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fn digest_to_prefix(digest: &[u8]) -> PathBuf {
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let mut buf = Vec::<u8>::with_capacity(3+1+2+1);
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buf.push(HEX_CHARS[(digest[0] as usize) >> 4]);
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buf.push(HEX_CHARS[(digest[0] as usize) &0xf]);
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buf.push(HEX_CHARS[(digest[1] as usize) >> 4]);
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buf.push('/' as u8);
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buf.push(HEX_CHARS[(digest[1] as usize) & 0xf]);
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buf.push(HEX_CHARS[(digest[2] as usize) >> 4]);
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buf.push('/' as u8);
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let path = unsafe { String::from_utf8_unchecked(buf)};
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path.into()
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}
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impl ChunkStore {
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fn chunk_dir<P: AsRef<Path>>(path: P) -> PathBuf {
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let mut chunk_dir: PathBuf = PathBuf::from(path.as_ref());
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chunk_dir.push(".chunks");
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chunk_dir
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}
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pub fn create<P: Into<PathBuf>>(name: &str, path: P) -> Result<Self, Error> {
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let base: PathBuf = path.into();
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let chunk_dir = Self::chunk_dir(&base);
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if let Err(err) = std::fs::create_dir(&base) {
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bail!("unable to create chunk store '{}' at {:?} - {}", name, base, err);
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}
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if let Err(err) = std::fs::create_dir(&chunk_dir) {
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bail!("unable to create chunk store '{}' subdir {:?} - {}", name, chunk_dir, err);
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}
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// create 4096 subdir
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for i in 0..4096 {
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let mut l1path = chunk_dir.clone();
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l1path.push(format!("{:03x}",i));
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if let Err(err) = std::fs::create_dir(&l1path) {
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bail!("unable to create chunk store '{}' subdir {:?} - {}", name, l1path, err);
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}
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}
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Self::open(name, base)
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}
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pub fn open<P: Into<PathBuf>>(name: &str, path: P) -> Result<Self, Error> {
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let base: PathBuf = path.into();
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let chunk_dir = Self::chunk_dir(&base);
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if let Err(err) = std::fs::metadata(&chunk_dir) {
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bail!("unable to open chunk store '{}' at {:?} - {}", name, chunk_dir, err);
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}
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let mut lockfile_path = base.clone();
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lockfile_path.push(".lock");
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// make sure only one process/thread/task can use it
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let lockfile = tools::open_file_locked(
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lockfile_path, Duration::from_secs(10))?;
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Ok(ChunkStore {
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name: name.to_owned(),
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base,
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chunk_dir,
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hasher: Sha512Trunc256::new(),
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_lockfile: lockfile,
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mutex: Mutex::new(false)
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})
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}
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pub fn touch_chunk(&mut self, digest:&[u8]) -> Result<(), Error> {
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// fixme: nix::sys::stat::utimensat
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let mut chunk_path = self.chunk_dir.clone();
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let prefix = digest_to_prefix(&digest);
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chunk_path.push(&prefix);
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let digest_str = digest_to_hex(&digest);
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chunk_path.push(&digest_str);
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std::fs::metadata(&chunk_path)?;
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Ok(())
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}
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fn sweep_old_files(&self, handle: &mut nix::dir::Dir) -> Result<(), Error> {
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let rawfd = handle.as_raw_fd();
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let now = unsafe { libc::time(std::ptr::null_mut()) };
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for entry in handle.iter() {
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let entry = match entry {
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Ok(entry) => entry,
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Err(_) => continue /* ignore */,
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};
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let file_type = match entry.file_type() {
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Some(file_type) => file_type,
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None => bail!("unsupported file system type on chunk store '{}'", self.name),
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};
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if file_type != nix::dir::Type::File { continue; }
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let filename = entry.file_name();
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if let Ok(stat) = nix::sys::stat::fstatat(rawfd, filename, nix::fcntl::AtFlags::AT_SYMLINK_NOFOLLOW) {
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let age = now - stat.st_atime;
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println!("FOUND {} {:?}", age/(3600*24), filename);
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if age/(3600*24) >= 2 {
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println!("UNLINK {} {:?}", age/(3600*24), filename);
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let res = unsafe { libc::unlinkat(rawfd, filename.as_ptr(), 0) };
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if res != 0 {
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let err = nix::Error::last();
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bail!("unlink chunk {:?} failed on store '{}' - {}", filename, self.name, err);
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}
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}
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}
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}
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Ok(())
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}
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pub fn sweep_used_chunks(&mut self) -> Result<(), Error> {
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use nix::fcntl::OFlag;
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use nix::sys::stat::Mode;
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use nix::dir::Dir;
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let base_handle = match Dir::open(
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&self.chunk_dir, OFlag::O_RDONLY, Mode::empty()) {
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Ok(h) => h,
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Err(err) => bail!("unable to open store '{}' chunk dir {:?} - {}",
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self.name, self.chunk_dir, err),
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};
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let base_fd = base_handle.as_raw_fd();
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for i in 0..4096 {
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let l1name = PathBuf::from(format!("{:03x}", i));
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let mut l1_handle = match nix::dir::Dir::openat(
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base_fd, &l1name, OFlag::O_RDONLY, Mode::empty()) {
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Ok(h) => h,
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Err(err) => bail!("unable to open store '{}' dir {:?}/{:?} - {}",
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self.name, self.chunk_dir, l1name, err),
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};
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let l1_fd = l1_handle.as_raw_fd();
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for l1_entry in l1_handle.iter() {
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let l1_entry = match l1_entry {
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Ok(l1_entry) => l1_entry,
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Err(_) => continue /* ignore errors? */,
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};
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let file_type = match l1_entry.file_type() {
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Some(file_type) => file_type,
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None => bail!("unsupported file system type on chunk store '{}'", self.name),
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};
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if file_type != nix::dir::Type::Directory { continue; }
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let l2name = l1_entry.file_name();
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if l2name.to_bytes_with_nul()[0] == b'.' { continue; }
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let mut l2_handle = match Dir::openat(
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l1_fd, l2name, OFlag::O_RDONLY, Mode::empty()) {
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Ok(h) => h,
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Err(err) => bail!(
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"unable to open store '{}' dir {:?}/{:?}/{:?} - {}",
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self.name, self.chunk_dir, l1name, l2name, err),
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};
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self.sweep_old_files(&mut l2_handle)?;
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}
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}
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Ok(())
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}
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pub fn insert_chunk(&mut self, chunk: &[u8]) -> Result<(bool, [u8; 32]), Error> {
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self.hasher.reset();
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self.hasher.input(chunk);
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let mut digest = [0u8; 32];
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self.hasher.result(&mut digest);
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//println!("DIGEST {}", digest_to_hex(&digest));
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let mut chunk_path = self.chunk_dir.clone();
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let prefix = digest_to_prefix(&digest);
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chunk_path.push(&prefix);
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let digest_str = digest_to_hex(&digest);
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chunk_path.push(&digest_str);
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let lock = self.mutex.lock();
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if let Ok(metadata) = std::fs::metadata(&chunk_path) {
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if metadata.is_file() {
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return Ok((true, digest));
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} else {
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bail!("Got unexpected file type for chunk {}", digest_str);
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}
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}
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let mut chunk_dir = self.chunk_dir.clone();
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chunk_dir.push(&prefix);
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if let Err(_) = std::fs::create_dir(&chunk_dir) { /* ignore */ }
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let mut tmp_path = chunk_path.clone();
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tmp_path.set_extension("tmp");
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let mut f = std::fs::File::create(&tmp_path)?;
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f.write_all(chunk)?;
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if let Err(err) = std::fs::rename(&tmp_path, &chunk_path) {
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if let Err(_) = std::fs::remove_file(&tmp_path) { /* ignore */ }
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bail!("Atomic rename failed for chunk {} - {}", digest_str, err);
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}
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println!("PATH {:?}", chunk_path);
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drop(lock);
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Ok((false, digest))
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}
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pub fn relative_path(&self, path: &Path) -> PathBuf {
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let mut full_path = self.base.clone();
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full_path.push(path);
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full_path
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}
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pub fn base_path(&self) -> PathBuf {
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self.base.clone()
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}
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}
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#[test]
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fn test_chunk_store1() {
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if let Err(_e) = std::fs::remove_dir_all(".testdir") { /* ignore */ }
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let chunk_store = ChunkStore::open(".testdir");
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assert!(chunk_store.is_err());
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let mut chunk_store = ChunkStore::create(".testdir").unwrap();
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let (exists, _) = chunk_store.insert_chunk(&[0u8, 1u8]).unwrap();
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assert!(!exists);
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let (exists, _) = chunk_store.insert_chunk(&[0u8, 1u8]).unwrap();
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assert!(exists);
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let chunk_store = ChunkStore::create(".testdir");
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assert!(chunk_store.is_err());
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}
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