use crate::{proto, Error}; use data_encoding::BASE64; use std::collections::HashMap; use std::sync::{Arc, RwLock}; use tracing::{instrument, warn}; use super::{DirectoryService, DirectoryTraverser}; #[derive(Clone, Default)] pub struct MemoryDirectoryService { db: Arc>>, } impl DirectoryService for MemoryDirectoryService { type DirectoriesIterator = DirectoryTraverser; #[instrument(skip(self, digest), fields(directory.digest = BASE64.encode(digest)))] fn get(&self, digest: &[u8; 32]) -> Result, Error> { let db = self.db.read()?; match db.get(digest) { // The directory was not found, return None => Ok(None), // The directory was found, try to parse the data as Directory message Some(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.clone())) } } } #[instrument(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 mut db = self.db.write()?; db.insert(digest, directory); 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) } }