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|
use super::{BlobReader, BlobService, BlobWriter};
use crate::{B3Digest, Error};
use std::{
io::{self, Cursor, Write},
path::Path,
task::Poll,
};
use tonic::async_trait;
use tracing::instrument;
#[derive(Clone)]
pub struct SledBlobService {
db: sled::Db,
}
impl SledBlobService {
pub fn new<P: AsRef<Path>>(p: P) -> Result<Self, sled::Error> {
let config = sled::Config::default()
.use_compression(false) // is a required parameter
.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 })
}
}
#[async_trait]
impl BlobService for SledBlobService {
#[instrument(skip(self), fields(blob.digest=%digest))]
async fn has(&self, digest: &B3Digest) -> io::Result<bool> {
match self.db.contains_key(digest.as_slice()) {
Ok(has) => Ok(has),
Err(e) => Err(io::Error::new(io::ErrorKind::Other, e.to_string())),
}
}
#[instrument(skip(self), fields(blob.digest=%digest))]
async fn open_read(&self, digest: &B3Digest) -> io::Result<Option<Box<dyn BlobReader>>> {
match self.db.get(digest.as_slice()) {
Ok(None) => Ok(None),
Ok(Some(data)) => Ok(Some(Box::new(Cursor::new(data[..].to_vec())))),
Err(e) => Err(io::Error::new(io::ErrorKind::Other, e.to_string())),
}
}
#[instrument(skip(self))]
async fn open_write(&self) -> Box<dyn BlobWriter> {
Box::new(SledBlobWriter::new(self.db.clone()))
}
}
pub struct SledBlobWriter {
db: sled::Db,
/// Contains the buffer 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 tokio::io::AsyncWrite for SledBlobWriter {
fn poll_write(
mut self: std::pin::Pin<&mut Self>,
_cx: &mut std::task::Context<'_>,
b: &[u8],
) -> std::task::Poll<Result<usize, io::Error>> {
Poll::Ready(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(&b[..bytes_written])
}
})
}
fn poll_flush(
mut self: std::pin::Pin<&mut Self>,
_cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), io::Error>> {
Poll::Ready(match &mut self.writers {
None => Err(io::Error::new(
io::ErrorKind::NotConnected,
"already closed",
)),
Some(_) => Ok(()),
})
}
fn poll_shutdown(
self: std::pin::Pin<&mut Self>,
_cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), io::Error>> {
// shutdown is "instantaneous", we only write to a Vec<u8> as buffer.
Poll::Ready(Ok(()))
}
}
#[async_trait]
impl BlobWriter for SledBlobWriter {
async fn close(&mut self) -> io::Result<B3Digest> {
if self.writers.is_none() {
match &self.digest {
Some(digest) => Ok(digest.clone()),
None => Err(io::Error::new(
io::ErrorKind::NotConnected,
"already closed",
)),
}
} else {
let (buf, hasher) = self.writers.take().unwrap();
let digest: B3Digest = hasher.finalize().as_bytes().into();
// Only insert if the blob doesn't already exist.
if !self.db.contains_key(digest.as_slice()).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.as_slice(), buf)
.map_err(|e| Error::StorageError(format!("unable to insert blob: {}", e)))?;
}
self.digest = Some(digest.clone());
Ok(digest)
}
}
}
|
