feat(tvix/store): add pathinfoservice r/5919

This adds a PathInfoService trait, and an implementation for it using
sled, and one using a HashMap.

Change-Id: I85fe4c9b6105808d7b0c095441326424ffc2d2bb
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8099
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>

1 files changed, 21 insertions, 0 deletions

diff --git a/tvix/store/src/pathinfoservice/mod.rs b/tvix/store/src/pathinfoservice/mod.rs
new file mode 100644
index 000000000000..b20985dd80ac
--- /dev/null
+++ b/tvix/store/src/pathinfoservice/mod.rs
@@ -0,0 +1,21 @@
+mod memory;
+mod sled;
+
+use crate::{proto, Error};
+
+pub use self::memory::MemoryPathInfoService;
+pub use self::sled::SledPathInfoService;
+
+/// The base trait all PathInfo services need to implement.
+/// This is a simple get and put of [proto::Directory], returning their digest.
+pub trait PathInfoService {
+    /// Retrieve a PathInfo message.
+    fn get(
+        &self,
+        by_what: proto::get_path_info_request::ByWhat,
+    ) -> Result<Option<proto::PathInfo>, Error>;
+
+    /// Store a PathInfo message. Implementations MUST call validate and reject
+    /// invalid messages.
+    fn put(&self, path_info: proto::PathInfo) -> Result<proto::PathInfo, Error>;
+}