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use super::PathInfoService;
use crate::proto::PathInfo;
use async_stream::try_stream;
use futures::stream::BoxStream;
use nix_compat::nixbase32;
use std::{collections::HashMap, sync::Arc};
use tokio::sync::RwLock;
use tonic::async_trait;
use tracing::instrument;
use tvix_castore::composition::{CompositionContext, ServiceBuilder};
use tvix_castore::Error;
#[derive(Default)]
pub struct MemoryPathInfoService {
db: Arc<RwLock<HashMap<[u8; 20], PathInfo>>>,
}
#[async_trait]
impl PathInfoService for MemoryPathInfoService {
#[instrument(level = "trace", skip_all, fields(path_info.digest = nixbase32::encode(&digest)))]
async fn get(&self, digest: [u8; 20]) -> Result<Option<PathInfo>, Error> {
let db = self.db.read().await;
match db.get(&digest) {
None => Ok(None),
Some(path_info) => Ok(Some(path_info.clone())),
}
}
#[instrument(level = "trace", skip_all, fields(path_info.root_node = ?path_info.node))]
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().await;
db.insert(*nix_path.digest(), path_info.clone());
Ok(path_info)
}
}
}
fn list(&self) -> BoxStream<'static, Result<PathInfo, Error>> {
let db = self.db.clone();
Box::pin(try_stream! {
let db = db.read().await;
let it = db.iter();
for (_k, v) in it {
yield v.clone()
}
})
}
}
#[derive(serde::Deserialize, Debug)]
#[serde(deny_unknown_fields)]
pub struct MemoryPathInfoServiceConfig {}
impl TryFrom<url::Url> for MemoryPathInfoServiceConfig {
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(MemoryPathInfoServiceConfig {})
}
}
#[async_trait]
impl ServiceBuilder for MemoryPathInfoServiceConfig {
type Output = dyn PathInfoService;
async fn build<'a>(
&'a self,
_instance_name: &str,
_context: &CompositionContext,
) -> Result<Arc<dyn PathInfoService>, Box<dyn std::error::Error + Send + Sync + 'static>> {
Ok(Arc::new(MemoryPathInfoService::default()))
}
}
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