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use crate::{proto, Error};
use data_encoding::BASE64;
use std::collections::HashMap;
use std::sync::{Arc, RwLock};
use tracing::{instrument, warn};
use super::DirectoryService;
#[derive(Clone, Default)]
pub struct MemoryDirectoryService {
db: Arc<RwLock<HashMap<[u8; 32], proto::Directory>>>,
}
impl DirectoryService for MemoryDirectoryService {
#[instrument(skip(self, digest), fields(directory.digest = BASE64.encode(digest)))]
fn get(&self, digest: &[u8; 32]) -> Result<Option<proto::Directory>, 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)
)));
}
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)
}
}
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