refactor(tvix/store): Asyncify PathInfoService and DirectoryService r/6623

We've decided to asyncify all of the services to reduce some of the
pains going back and for between sync<->async. The end goal will be for
all the tvix-store internals to be async and then expose a sync
interface for things like tvix eval io.

Change-Id: I97c71f8db1d05a38bd8f625df5087d565705d52d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9369
Autosubmit: Connor Brewster <cbrewster@hey.com>
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

1 files changed, 11 insertions, 9 deletions

diff --git a/tvix/store/src/directoryservice/memory.rs b/tvix/store/src/directoryservice/memory.rs
index 634dbf9922d0..ac67c999d01b 100644
--- a/tvix/store/src/directoryservice/memory.rs
+++ b/tvix/store/src/directoryservice/memory.rs
@@ -1,16 +1,20 @@
 use crate::{proto, B3Digest, Error};
+use futures::Stream;
 use std::collections::HashMap;
+use std::pin::Pin;
 use std::sync::{Arc, RwLock};
+use tonic::async_trait;
 use tracing::{instrument, warn};
 
-use super::utils::SimplePutter;
-use super::{DirectoryPutter, DirectoryService, DirectoryTraverser};
+use super::utils::{traverse_directory, SimplePutter};
+use super::{DirectoryPutter, DirectoryService};
 
 #[derive(Clone, Default)]
 pub struct MemoryDirectoryService {
     db: Arc<RwLock<HashMap<B3Digest, proto::Directory>>>,
 }
 
+#[async_trait]
 impl DirectoryService for MemoryDirectoryService {
     /// Constructs a [MemoryDirectoryService] from the passed [url::Url]:
     /// - scheme has to be `memory://`
@@ -27,8 +31,9 @@ impl DirectoryService for MemoryDirectoryService {
 
         Ok(Self::default())
     }
+
     #[instrument(skip(self, digest), fields(directory.digest = %digest))]
-    fn get(&self, digest: &B3Digest) -> Result<Option<proto::Directory>, Error> {
+    async fn get(&self, digest: &B3Digest) -> Result<Option<proto::Directory>, Error> {
         let db = self.db.read()?;
 
         match db.get(digest) {
@@ -62,7 +67,7 @@ impl DirectoryService for MemoryDirectoryService {
     }
 
     #[instrument(skip(self, directory), fields(directory.digest = %directory.digest()))]
-    fn put(&self, directory: proto::Directory) -> Result<B3Digest, Error> {
+    async fn put(&self, directory: proto::Directory) -> Result<B3Digest, Error> {
         let digest = directory.digest();
 
         // validate the directory itself.
@@ -84,11 +89,8 @@ impl DirectoryService for MemoryDirectoryService {
     fn get_recursive(
         &self,
         root_directory_digest: &B3Digest,
-    ) -> Box<dyn Iterator<Item = Result<proto::Directory, Error>> + Send> {
-        Box::new(DirectoryTraverser::with(
-            self.clone(),
-            root_directory_digest,
-        ))
+    ) -> Pin<Box<dyn Stream<Item = Result<proto::Directory, Error>> + Send>> {
+        traverse_directory(self.clone(), root_directory_digest)
     }
 
     #[instrument(skip_all)]