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use super::PathInfoService;
use crate::{nar::calculate_size_and_sha256, proto::PathInfo};
use futures::{stream::iter, Stream};
use std::{
collections::HashMap,
pin::Pin,
sync::{Arc, RwLock},
};
use tonic::async_trait;
use tvix_castore::proto as castorepb;
use tvix_castore::Error;
use tvix_castore::{blobservice::BlobService, directoryservice::DirectoryService};
pub struct MemoryPathInfoService {
db: Arc<RwLock<HashMap<[u8; 20], PathInfo>>>,
blob_service: Arc<dyn BlobService>,
directory_service: Arc<dyn DirectoryService>,
}
impl MemoryPathInfoService {
pub fn new(
blob_service: Arc<dyn BlobService>,
directory_service: Arc<dyn DirectoryService>,
) -> Self {
Self {
db: Default::default(),
blob_service,
directory_service,
}
}
}
#[async_trait]
impl PathInfoService for MemoryPathInfoService {
async fn get(&self, digest: [u8; 20]) -> Result<Option<PathInfo>, Error> {
let db = self.db.read().unwrap();
match db.get(&digest) {
None => Ok(None),
Some(path_info) => Ok(Some(path_info.clone())),
}
}
async fn put(&self, path_info: PathInfo) -> Result<PathInfo, Error> {
// Call validate on the received PathInfo message.
match path_info.validate() {
Err(e) => Err(Error::InvalidRequest(format!(
"failed to validate PathInfo: {}",
e
))),
// In case the PathInfo is valid, and we were able to extract a NixPath, store it in the database.
// This overwrites existing PathInfo objects.
Ok(nix_path) => {
let mut db = self.db.write().unwrap();
db.insert(*nix_path.digest(), path_info.clone());
Ok(path_info)
}
}
}
async fn calculate_nar(
&self,
root_node: &castorepb::node::Node,
) -> Result<(u64, [u8; 32]), Error> {
calculate_size_and_sha256(
root_node,
self.blob_service.clone(),
self.directory_service.clone(),
)
.await
.map_err(|e| Error::StorageError(e.to_string()))
}
fn list(&self) -> Pin<Box<dyn Stream<Item = Result<PathInfo, Error>> + Send>> {
let db = self.db.read().unwrap();
// Copy all elements into a list.
// This is a bit ugly, because we can't have db escape the lifetime
// of this function, but elements need to be returned owned anyways, and this in-
// memory impl is only for testing purposes anyways.
let items: Vec<_> = db.iter().map(|(_k, v)| Ok(v.clone())).collect();
Box::pin(iter(items))
}
}
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