feat(tvix): different service types in one composition r/8372

This will be necessary for the PathInfoService composition, as some
PathInfoService implementations require a BlobService & DirectoryService
to ingest into.

Using the Extend trait for creating compositions allows extending the same
composition with configs of various types e.g. BlobStore, DirectoryStore
Generics are moved from the Composition struct to the functions.The storage of
the InstantiatonStates uses the TypeId in the key and a Box<dyn Any> in the
value, which is downcasted to InstantiatonState<T>.

Change-Id: I2af11f26c535029adfb1c62905e0e7c4aaed7b51
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11980
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
Autosubmit: yuka <yuka@yuka.dev>

1 files changed, 1 insertions, 1 deletions

diff --git a/tvix/castore/src/directoryservice/combinators.rs b/tvix/castore/src/directoryservice/combinators.rs
index 74d02f1ad2b9..0fdc82c16cb0 100644
--- a/tvix/castore/src/directoryservice/combinators.rs
+++ b/tvix/castore/src/directoryservice/combinators.rs
@@ -167,7 +167,7 @@ impl ServiceBuilder for CacheConfig {
     async fn build<'a>(
         &'a self,
         _instance_name: &str,
-        context: &CompositionContext<dyn DirectoryService>,
+        context: &CompositionContext,
     ) -> Result<Arc<dyn DirectoryService>, Box<dyn std::error::Error + Send + Sync + 'static>> {
         let (near, far) = futures::join!(
             context.resolve(self.near.clone()),