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|
use super::{BlobService, BlobWriter};
use crate::{B3Digest, Error};
use std::{
io::{self, Cursor},
path::PathBuf,
};
use tracing::instrument;
#[derive(Clone)]
pub struct SledBlobService {
db: sled::Db,
}
impl SledBlobService {
pub fn new(p: PathBuf) -> Result<Self, sled::Error> {
let config = sled::Config::default().use_compression(true).path(p);
let db = config.open()?;
Ok(Self { db })
}
pub fn new_temporary() -> Result<Self, sled::Error> {
let config = sled::Config::default().temporary(true);
let db = config.open()?;
Ok(Self { db })
}
}
impl BlobService for SledBlobService {
#[instrument(skip(self), fields(blob.digest=%digest))]
fn has(&self, digest: &B3Digest) -> Result<bool, Error> {
match self.db.contains_key(digest.to_vec()) {
Ok(has) => Ok(has),
Err(e) => Err(Error::StorageError(e.to_string())),
}
}
#[instrument(skip(self), fields(blob.digest=%digest))]
fn open_read(&self, digest: &B3Digest) -> Result<Option<Box<dyn io::Read + Send>>, Error> {
match self.db.get(digest.to_vec()) {
Ok(None) => Ok(None),
Ok(Some(data)) => Ok(Some(Box::new(Cursor::new(data[..].to_vec())))),
Err(e) => Err(Error::StorageError(e.to_string())),
}
}
#[instrument(skip(self))]
fn open_write(&self) -> Result<Box<dyn BlobWriter>, Error> {
Ok(Box::new(SledBlobWriter::new(self.db.clone())))
}
}
pub struct SledBlobWriter {
db: sled::Db,
/// Contains the Vec and hasher, or None if already closed
writers: Option<(Vec<u8>, blake3::Hasher)>,
/// The digest that has been returned, if we successfully closed.
digest: Option<B3Digest>,
}
impl SledBlobWriter {
pub fn new(db: sled::Db) -> Self {
Self {
db,
writers: Some((Vec::new(), blake3::Hasher::new())),
digest: None,
}
}
}
impl io::Write for SledBlobWriter {
fn write(&mut self, b: &[u8]) -> io::Result<usize> {
match &mut self.writers {
None => Err(io::Error::new(
io::ErrorKind::NotConnected,
"already closed",
)),
Some((ref mut buf, ref mut hasher)) => {
let bytes_written = buf.write(b)?;
hasher.write(&buf[..bytes_written])
}
}
}
fn flush(&mut self) -> io::Result<()> {
match &mut self.writers {
None => Err(io::Error::new(
io::ErrorKind::NotConnected,
"already closed",
)),
Some(_) => Ok(()),
}
}
}
impl BlobWriter for SledBlobWriter {
fn close(&mut self) -> Result<B3Digest, Error> {
if self.writers.is_none() {
match &self.digest {
Some(digest) => Ok(digest.clone()),
None => Err(crate::Error::StorageError(
"previously closed with error".to_string(),
)),
}
} else {
let (buf, hasher) = self.writers.take().unwrap();
// We know self.hasher is doing blake3 hashing, so this won't fail.
let digest = B3Digest::from_vec(hasher.finalize().as_bytes().to_vec()).unwrap();
// Only insert if the blob doesn't already exist.
if !self.db.contains_key(&digest.to_vec()).map_err(|e| {
Error::StorageError(format!("Unable to check if we have blob {}: {}", digest, e))
})? {
// put buf in there. This will move buf out.
self.db
.insert(digest.to_vec(), buf)
.map_err(|e| Error::StorageError(format!("unable to insert blob: {}", e)))?;
}
self.digest = Some(digest.clone());
Ok(digest)
}
}
}
|
