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|
use crate::proto::Directory;
use crate::{proto, B3Digest, Error};
use futures::stream::BoxStream;
use prost::Message;
use std::ops::Deref;
use std::path::Path;
use tonic::async_trait;
use tracing::{instrument, warn};
use super::utils::traverse_directory;
use super::{ClosureValidator, DirectoryPutter, DirectoryService};
#[derive(Clone)]
pub struct SledDirectoryService {
db: sled::Db,
}
impl SledDirectoryService {
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 DirectoryService for SledDirectoryService {
#[instrument(skip(self, digest), fields(directory.digest = %digest))]
async fn get(&self, digest: &B3Digest) -> Result<Option<proto::Directory>, Error> {
let resp = tokio::task::spawn_blocking({
let db = self.db.clone();
let digest = digest.clone();
move || db.get(digest.as_slice())
})
.await?
.map_err(|e| {
warn!("failed to retrieve directory: {}", e);
Error::StorageError(format!("failed to retrieve directory: {}", e))
})?;
match resp {
// The directory was not found, return
None => Ok(None),
// The directory was found, try to parse the data as Directory message
Some(data) => match Directory::decode(&*data) {
Ok(directory) => {
// Validate the retrieved Directory indeed has the
// digest we expect it to have, to detect corruptions.
let actual_digest = directory.digest();
if actual_digest != *digest {
return Err(Error::StorageError(format!(
"requested directory with digest {}, but got {}",
digest, actual_digest
)));
}
// Validate the Directory itself is valid.
if let Err(e) = directory.validate() {
warn!("directory failed validation: {}", e.to_string());
return Err(Error::StorageError(format!(
"directory {} failed validation: {}",
actual_digest, e,
)));
}
Ok(Some(directory))
}
Err(e) => {
warn!("unable to parse directory {}: {}", digest, e);
Err(Error::StorageError(e.to_string()))
}
},
}
}
#[instrument(skip(self, directory), fields(directory.digest = %directory.digest()))]
async fn put(&self, directory: proto::Directory) -> Result<B3Digest, Error> {
tokio::task::spawn_blocking({
let db = self.db.clone();
move || {
let digest = directory.digest();
// validate the directory itself.
if let Err(e) = directory.validate() {
return Err(Error::InvalidRequest(format!(
"directory {} failed validation: {}",
digest, e,
)));
}
// store it
db.insert(digest.as_slice(), directory.encode_to_vec())
.map_err(|e| Error::StorageError(e.to_string()))?;
Ok(digest)
}
})
.await?
}
#[instrument(skip_all, fields(directory.digest = %root_directory_digest))]
fn get_recursive(
&self,
root_directory_digest: &B3Digest,
) -> BoxStream<'static, Result<proto::Directory, Error>> {
traverse_directory(self.clone(), root_directory_digest)
}
#[instrument(skip_all)]
fn put_multiple_start(&self) -> Box<(dyn DirectoryPutter + 'static)>
where
Self: Clone,
{
Box::new(SledDirectoryPutter {
tree: self.db.deref().clone(),
directory_validator: Some(Default::default()),
})
}
}
/// Buffers Directory messages to be uploaded and inserts them in a batch
/// transaction on close.
pub struct SledDirectoryPutter {
tree: sled::Tree,
/// The directories (inside the directory validator) that we insert later,
/// or None, if they were already inserted.
directory_validator: Option<ClosureValidator>,
}
#[async_trait]
impl DirectoryPutter for SledDirectoryPutter {
#[instrument(level = "trace", skip_all, fields(directory.digest=%directory.digest()), err)]
async fn put(&mut self, directory: proto::Directory) -> Result<(), Error> {
match self.directory_validator {
None => return Err(Error::StorageError("already closed".to_string())),
Some(ref mut validator) => {
validator.add(directory)?;
}
}
Ok(())
}
#[instrument(level = "trace", skip_all, ret, err)]
async fn close(&mut self) -> Result<B3Digest, Error> {
match self.directory_validator.take() {
None => Err(Error::InvalidRequest("already closed".to_string())),
Some(validator) => {
// Insert all directories as a batch.
tokio::task::spawn_blocking({
let tree = self.tree.clone();
move || {
// retrieve the validated directories.
let directories = validator.finalize()?;
// Get the root digest, which is at the end (cf. insertion order)
let root_digest = directories
.last()
.ok_or_else(|| Error::InvalidRequest("got no directories".to_string()))?
.digest();
let mut batch = sled::Batch::default();
for directory in directories {
batch.insert(directory.digest().as_slice(), directory.encode_to_vec());
}
tree.apply_batch(batch).map_err(|e| {
Error::StorageError(format!("unable to apply batch: {}", e))
})?;
Ok(root_digest)
}
})
.await?
}
}
}
}
|
