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use crate::{B3Digest, Error};
use futures::stream::BoxStream;
use std::collections::HashMap;
use std::sync::Arc;
use tokio::sync::RwLock;
use tonic::async_trait;
use tracing::{instrument, warn};
use super::utils::traverse_directory;
use super::{Directory, DirectoryPutter, DirectoryService, SimplePutter};
use crate::composition::{CompositionContext, ServiceBuilder};
use crate::proto;
#[derive(Clone, Default)]
pub struct MemoryDirectoryService {
db: Arc<RwLock<HashMap<B3Digest, proto::Directory>>>,
}
#[async_trait]
impl DirectoryService for MemoryDirectoryService {
#[instrument(skip(self, digest), fields(directory.digest = %digest))]
async fn get(&self, digest: &B3Digest) -> Result<Option<Directory>, Error> {
let db = self.db.read().await;
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 != *digest {
return Err(Error::StorageError(format!(
"requested directory with digest {}, but got {}",
digest, actual_digest
)));
}
Ok(Some(directory.clone().try_into().map_err(|e| {
crate::Error::StorageError(format!("corrupted directory: {}", e))
})?))
}
}
}
#[instrument(skip(self, directory), fields(directory.digest = %directory.digest()))]
async fn put(&self, directory: Directory) -> Result<B3Digest, Error> {
let digest = directory.digest();
// store it
let mut db = self.db.write().await;
db.insert(digest.clone(), directory.into());
Ok(digest)
}
#[instrument(skip_all, fields(directory.digest = %root_directory_digest))]
fn get_recursive(
&self,
root_directory_digest: &B3Digest,
) -> BoxStream<'static, Result<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(SimplePutter::new(self.clone()))
}
}
#[derive(serde::Deserialize, Debug)]
#[serde(deny_unknown_fields)]
pub struct MemoryDirectoryServiceConfig {}
impl TryFrom<url::Url> for MemoryDirectoryServiceConfig {
type Error = Box<dyn std::error::Error + Send + Sync>;
fn try_from(url: url::Url) -> Result<Self, Self::Error> {
// memory doesn't support host or path in the URL.
if url.has_host() || !url.path().is_empty() {
return Err(Error::StorageError("invalid url".to_string()).into());
}
Ok(MemoryDirectoryServiceConfig {})
}
}
#[async_trait]
impl ServiceBuilder for MemoryDirectoryServiceConfig {
type Output = dyn DirectoryService;
async fn build<'a>(
&'a self,
_instance_name: &str,
_context: &CompositionContext,
) -> Result<Arc<dyn DirectoryService>, Box<dyn std::error::Error + Send + Sync + 'static>> {
Ok(Arc::new(MemoryDirectoryService::default()))
}
}
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