refactor(tvix/store): drop calculate_nar from PathInfoService r/8103

This shouldn't be part of the PathInfoService trait.

Pretty much none of the PathInfoServices do implement it, and requiring
them to implement it means they also cannot make use of this calculation
already being done by other PathInfoServices.

Move it out into its own NarCalculationService trait, defined somewhere
at tvix_store::nar, and have everyone who wants to trigger nar
calculation use nar_calculation_service directly, which now is an
additional field in TvixStoreIO for example.

It being moved outside the PathInfoService trait doesn't prohibit
specific implementations to implement it (like the GRPC client for the
`PathInfoService` does.

This is currently wired together in a bit of a hacky fashion - as of
now, everything uses the naive implementation that traverses blob and
directoryservice, rather than composing it properly. I want to leave
that up to a later CL, dealing with other parts of store composition
too.

Change-Id: I18d07ea4301d4a07651b8218bc5fe95e4e307208
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11619
Reviewed-by: Connor Brewster <cbrewster@hey.com>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

1 files changed, 1 insertions, 12 deletions

diff --git a/tvix/store/src/pathinfoservice/nix_http.rs b/tvix/store/src/pathinfoservice/nix_http.rs
index 581eb7ca7af8..08cd1d0ecb90 100644
--- a/tvix/store/src/pathinfoservice/nix_http.rs
+++ b/tvix/store/src/pathinfoservice/nix_http.rs
@@ -33,8 +33,7 @@ use super::PathInfoService;
 ///
 /// The client is expected to be (indirectly) using the same [BlobService] and
 /// [DirectoryService], so able to fetch referred Directories and Blobs.
-/// [PathInfoService::put] and [PathInfoService::calculate_nar] are not
-/// implemented and return an error if called.
+/// [PathInfoService::put] is not implemented and returns an error if called.
 /// TODO: what about reading from nix-cache-info?
 pub struct NixHTTPPathInfoService<BS, DS> {
     base_url: url::Url,
@@ -258,16 +257,6 @@ where
         ))
     }
 
-    #[instrument(skip_all, fields(root_node=?root_node))]
-    async fn calculate_nar(
-        &self,
-        root_node: &castorepb::node::Node,
-    ) -> Result<(u64, [u8; 32]), Error> {
-        Err(Error::InvalidRequest(
-            "calculate_nar not supported for this backend".to_string(),
-        ))
-    }
-
     fn list(&self) -> BoxStream<'static, Result<PathInfo, Error>> {
         Box::pin(futures::stream::once(async {
             Err(Error::InvalidRequest(