refactor(tvix/src/nar): drop NARCalculationService r/6270

There's only one way to calculate NAR files, by walking through them.

Things like caching such replies should be done closer to where we use
these, composing NARCalculationService doesn't actually give us much.

Instead, expose two functions, `nar::calculate_size_and_sha256` and
`nar::writer_nar`, the latter writing NAR to a writer, the former using
write_nar to only keeping the NAR size and digest.

Change-Id: Ie5d2cfea35470fdbb5cbf9da1136b0cdf0250266
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8723
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>

1 files changed, 3 insertions, 12 deletions

diff --git a/tvix/store/src/nar/mod.rs b/tvix/store/src/nar/mod.rs
index a29cc5451bae..c73e610f4ecb 100644
--- a/tvix/store/src/nar/mod.rs
+++ b/tvix/store/src/nar/mod.rs
@@ -1,14 +1,10 @@
-use crate::{proto, B3Digest};
+use crate::B3Digest;
 use data_encoding::BASE64;
 use thiserror::Error;
 
-mod grpc_nar_calculation_service;
-mod non_caching_calculation_service;
 mod renderer;
-
-pub use grpc_nar_calculation_service::GRPCNARCalculationService;
-pub use non_caching_calculation_service::NonCachingNARCalculationService;
-pub use renderer::NARRenderer;
+pub use renderer::calculate_size_and_sha256;
+pub use renderer::writer_nar;
 
 /// Errors that can encounter while rendering NARs.
 #[derive(Debug, Error)]
@@ -28,8 +24,3 @@ pub enum RenderError {
     #[error("failure using the NAR writer: {0}")]
     NARWriterError(std::io::Error),
 }
-
-/// The base trait for something calculating NARs, and returning their size and sha256.
-pub trait NARCalculationService {
-    fn calculate_nar(&self, root_node: &proto::node::Node) -> Result<(u64, [u8; 32]), RenderError>;
-}