feat(server): add tracing spans and caching to archive and blame services

- Add tracing spans with repo labels for archive and blame operations
- Implement caching for archive list entries when using OID selectors
- Implement caching for blame operations when using OID selectors
- Add detailed

server/archive.rs

@@ -1,6 +1,6 @@
 use crate::pb::*;
 
-use super::{GitksService, into_status, into_stream};
+use super::{GitksService, cache, into_status};
 
 #[tonic::async_trait]
 impl archive_service_server::ArchiveService for GitksService {
@@ -12,9 +12,13 @@ impl archive_service_server::ArchiveService for GitksService {
         request: tonic::Request<ArchiveRequest>,
     ) -> Result<tonic::Response<Self::GetArchiveStream>, tonic::Status> {
         let inner = request.into_inner();
+        let repo = self.repo_label(inner.repository.as_ref());
+        let span = tracing::info_span!("archive.get_archive", %repo);
+        let _enter = span.enter();
         let gb = self.resolve(inner.repository.as_ref())?;
-        let chunks = gb.get_archive(inner).map_err(into_status)?;
-        Ok(tonic::Response::new(into_stream(chunks)))
+        let stream = gb.get_archive_stream(inner)?;
+        tracing::info!(%repo, "archive streaming started");
+        Ok(tonic::Response::new(stream))
     }
 
     async fn list_archive_entries(
@@ -22,8 +26,18 @@ impl archive_service_server::ArchiveService for GitksService {
         request: tonic::Request<ListArchiveEntriesRequest>,
     ) -> Result<tonic::Response<ListArchiveEntriesResponse>, tonic::Status> {
         let inner = request.into_inner();
+        let repo = self.repo_label(inner.repository.as_ref());
+        let span = tracing::info_span!("archive.list_archive_entries", %repo);
+        let _enter = span.enter();
         let gb = self.resolve(inner.repository.as_ref())?;
-        let resp = gb.list_archive_entries(inner).map_err(into_status)?;
+        let resp = if cache::selector_is_oid(&inner.treeish) {
+            cache::cached_response("archive.list_archive_entries", &inner, || {
+                gb.list_archive_entries(inner.clone()).map_err(into_status)
+            })?
+        } else {
+            gb.list_archive_entries(inner).map_err(into_status)?
+        };
+        tracing::info!(%repo, count = resp.entries.len(), "list_archive_entries done");
         Ok(tonic::Response::new(resp))
     }
 }