1 files changed, 84 insertions, 0 deletions
diff --git a/tvix/store/src/pathinfoservice/memory.rs b/tvix/store/src/pathinfoservice/memory.rs
new file mode 100644
index 0000000000..f8435dbbf8
--- /dev/null
+++ b/tvix/store/src/pathinfoservice/memory.rs
@@ -0,0 +1,84 @@
+use super::PathInfoService;
+use crate::{nar::calculate_size_and_sha256, proto::PathInfo};
+use futures::stream::{iter, BoxStream};
+use std::{
+    collections::HashMap,
+    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<BS, DS> {
+    db: Arc<RwLock<HashMap<[u8; 20], PathInfo>>>,
+
+    blob_service: BS,
+    directory_service: DS,
+}
+
+impl<BS, DS> MemoryPathInfoService<BS, DS> {
+    pub fn new(blob_service: BS, directory_service: DS) -> Self {
+        Self {
+            db: Default::default(),
+            blob_service,
+            directory_service,
+        }
+    }
+}
+
+#[async_trait]
+impl<BS, DS> PathInfoService for MemoryPathInfoService<BS, DS>
+where
+    BS: AsRef<dyn BlobService> + Send + Sync,
+    DS: AsRef<dyn DirectoryService> + Send + Sync,
+{
+    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, &self.directory_service)
+            .await
+            .map_err(|e| Error::StorageError(e.to_string()))
+    }
+
+    fn list(&self) -> BoxStream<'static, Result<PathInfo, Error>> {
+        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))
+    }
+}