forked from Deuxfleurs/garage
add checksum to end of file instead of decompressing
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parent
01c623e391
commit
9215d63e3a
1 changed files with 31 additions and 17 deletions
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@ -158,22 +158,30 @@ impl BlockManager {
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if self.is_block_compressed(hash).await.is_ok() {
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return Ok(Message::Ok);
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}
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let _lock = self.data_dir_lock.lock().await;
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let mut path = self.block_dir(hash);
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fs::create_dir_all(&path).await?;
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path.push(hex::encode(hash));
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let buffer = match data {
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BlockData::Plain(b) => b,
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let (buffer, checksum) = match data {
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BlockData::Plain(b) => (b, None),
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BlockData::Compressed(b) => {
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path.set_extension("zst");
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b
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let checksum = blake2sum(&b);
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(b, Some(checksum))
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}
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};
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let _lock = self.data_dir_lock.lock().await;
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fs::create_dir_all(&path).await?;
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path.push(hex::encode(hash));
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if checksum.is_some() {
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path.set_extension("zst.b2");
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}
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let mut f = fs::File::create(path).await?;
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f.write_all(&buffer).await?;
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if let Some(checksum) = checksum {
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f.write_all(checksum.as_slice()).await?;
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}
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drop(f);
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Ok(Message::Ok)
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@ -190,7 +198,7 @@ impl BlockManager {
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f.map(|f| (f, false)).map_err(Into::into)
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}
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Ok(true) => {
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path.set_extension("zst");
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path.set_extension("zst.b2");
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let f = fs::File::open(&path).await;
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f.map(|f| (f, true)).map_err(Into::into)
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}
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@ -207,14 +215,19 @@ impl BlockManager {
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f.read_to_end(&mut data).await?;
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drop(f);
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let sum = if compressed {
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zstd_decode(&data[..])
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.ok()
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.map(|decompressed| blake2sum(&decompressed[..]))
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let sum_ok = if compressed {
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if data.len() >= 32 {
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let data_len = data.len() - 32;
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let checksum = data.split_off(data_len);
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blake2sum(&data[..]).as_slice() == &checksum
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} else {
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// the file is too short to be valid
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false
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}
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} else {
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Some(blake2sum(&data[..]))
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blake2sum(&data[..]) == *hash
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};
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if sum.is_none() || sum.unwrap() != *hash {
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if !sum_ok {
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let _lock = self.data_dir_lock.lock().await;
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warn!(
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"Block {:?} is corrupted. Renaming to .corrupted and resyncing.",
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@ -257,11 +270,12 @@ impl BlockManager {
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async fn is_block_compressed(&self, hash: &Hash) -> Result<bool, Error> {
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let mut path = self.block_path(hash);
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path.set_extension("zst.b2");
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if fs::metadata(&path).await.is_ok() {
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return Ok(false);
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return Ok(true);
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}
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path.set_extension("zst");
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fs::metadata(&path).await.map(|_| true).map_err(Into::into)
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path.set_extension("");
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fs::metadata(&path).await.map(|_| false).map_err(Into::into)
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}
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fn block_dir(&self, hash: &Hash) -> PathBuf {
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