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, DirectoryTraverser}; #[derive(Clone)] pub struct SledDirectoryService { db: sled::Db, } impl SledDirectoryService { pub fn new(p: PathBuf) -> Result { let config = sled::Config::default().use_compression(true).path(p); let db = config.open()?; Ok(Self { db }) } pub fn new_temporary() -> Result { let config = sled::Config::default().temporary(true); let db = config.open()?; Ok(Self { db }) } } impl DirectoryService for SledDirectoryService { type DirectoriesIterator = DirectoryTraverser; #[instrument(name = "SledDirectoryService::get", skip(self, digest), fields(directory.digest = BASE64.encode(digest)))] fn get(&self, digest: &[u8; 32]) -> Result, 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) ))); } // 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: {}", BASE64.encode(&actual_digest), e, ))); } 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) } #[instrument(skip_all, fields(directory.digest = BASE64.encode(root_directory_digest)))] fn get_recursive(&self, root_directory_digest: &[u8; 32]) -> Self::DirectoriesIterator { DirectoryTraverser::with(self.clone(), root_directory_digest) } }