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use crate::proto::Directory;
use crate::{proto, Error};
use data_encoding::BASE64;
use prost::Message;
use std::path::PathBuf;
use tracing::{instrument, warn};
use super::DirectoryService;
#[derive(Clone)]
pub struct SledDirectoryService {
db: sled::Db,
}
impl SledDirectoryService {
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 DirectoryService for SledDirectoryService {
#[instrument(name = "SledDirectoryService::get", skip(self, digest), fields(directory.digest = BASE64.encode(digest)))]
fn get(&self, digest: &[u8; 32]) -> Result<Option<proto::Directory>, Error> {
match self.db.get(digest) {
// The directory was not found, return
Ok(None) => Ok(None),
// The directory was found, try to parse the data as Directory message
Ok(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.as_slice() != digest {
return Err(Error::StorageError(format!(
"requested directory with digest {}, but got {}",
BASE64.encode(digest),
BASE64.encode(&actual_digest)
)));
}
Ok(Some(directory))
}
Err(e) => {
warn!("unable to parse directory {}: {}", BASE64.encode(digest), e);
Err(Error::StorageError(e.to_string()))
}
},
// some storage error?
Err(e) => Err(Error::StorageError(e.to_string())),
}
}
#[instrument(name = "SledDirectoryService::put", skip(self, directory), fields(directory.digest = BASE64.encode(&directory.digest())))]
fn put(&self, directory: proto::Directory) -> Result<[u8; 32], Error> {
let digest = directory.digest();
// validate the directory itself.
if let Err(e) = directory.validate() {
return Err(Error::InvalidRequest(format!(
"directory {} failed validation: {}",
BASE64.encode(&digest),
e,
)));
}
// store it
let result = self.db.insert(digest, directory.encode_to_vec());
if let Err(e) = result {
return Err(Error::StorageError(e.to_string()));
}
Ok(digest)
}
}
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