1 files changed, 61 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..3de3221df2
--- /dev/null
+++ b/tvix/store/src/pathinfoservice/memory.rs
@@ -0,0 +1,61 @@
+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::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()
+            }
+        })
+    }
+}