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/diff.rs

@@ -1,6 +1,6 @@
 use crate::pb::*;
 
-use super::{GitksService, into_status, into_stream};
+use super::{GitksService, cache, into_status, into_stream};
 
 #[tonic::async_trait]
 impl diff_service_server::DiffService for GitksService {
@@ -12,8 +12,18 @@ impl diff_service_server::DiffService for GitksService {
         request: tonic::Request<GetDiffRequest>,
     ) -> Result<tonic::Response<GetDiffResponse>, tonic::Status> {
         let inner = request.into_inner();
+        let repo = self.repo_label(inner.repository.as_ref());
+        let span = tracing::info_span!("diff.get_diff", %repo);
+        let _enter = span.enter();
         let gb = self.resolve(inner.repository.as_ref())?;
-        let resp = gb.get_diff(inner).map_err(into_status)?;
+        let resp = if cache::selectors_are_oid(&inner.base, &inner.head) {
+            cache::cached_response("diff.get_diff", &inner, || {
+                gb.get_diff(inner.clone()).map_err(into_status)
+            })?
+        } else {
+            gb.get_diff(inner).map_err(into_status)?
+        };
+        tracing::info!(%repo, files = resp.files.len(), overflow = resp.overflow, "get_diff done");
         Ok(tonic::Response::new(resp))
     }
 
@@ -22,8 +32,18 @@ impl diff_service_server::DiffService for GitksService {
         request: tonic::Request<GetCommitDiffRequest>,
     ) -> Result<tonic::Response<GetDiffResponse>, tonic::Status> {
         let inner = request.into_inner();
+        let repo = self.repo_label(inner.repository.as_ref());
+        let span = tracing::info_span!("diff.get_commit_diff", %repo);
+        let _enter = span.enter();
         let gb = self.resolve(inner.repository.as_ref())?;
-        let resp = gb.get_commit_diff(inner).map_err(into_status)?;
+        let resp = if cache::selector_is_oid(&inner.commit) {
+            cache::cached_response("diff.get_commit_diff", &inner, || {
+                gb.get_commit_diff(inner.clone()).map_err(into_status)
+            })?
+        } else {
+            gb.get_commit_diff(inner).map_err(into_status)?
+        };
+        tracing::info!(%repo, files = resp.files.len(), "get_commit_diff done");
         Ok(tonic::Response::new(resp))
     }
 
@@ -32,8 +52,17 @@ impl diff_service_server::DiffService for GitksService {
         request: tonic::Request<GetPatchRequest>,
     ) -> Result<tonic::Response<Self::GetPatchStream>, tonic::Status> {
         let inner = request.into_inner();
+        let repo = self.repo_label(inner.repository.as_ref());
+        let span = tracing::info_span!("diff.get_patch", %repo);
+        let _enter = span.enter();
         let gb = self.resolve(inner.repository.as_ref())?;
-        let items = gb.get_patch(inner).map_err(into_status)?;
+        let items = if cache::selectors_are_oid(&inner.base, &inner.head) {
+            cache::cached_vec_response("diff.get_patch", &inner, || {
+                gb.get_patch(inner.clone()).map_err(into_status)
+            })?
+        } else {
+            gb.get_patch(inner).map_err(into_status)?
+        };
         Ok(tonic::Response::new(into_stream(items)))
     }
 
@@ -42,8 +71,17 @@ impl diff_service_server::DiffService for GitksService {
         request: tonic::Request<GetDiffStatsRequest>,
     ) -> Result<tonic::Response<DiffStats>, tonic::Status> {
         let inner = request.into_inner();
+        let repo = self.repo_label(inner.repository.as_ref());
+        let span = tracing::info_span!("diff.get_diff_stats", %repo);
+        let _enter = span.enter();
         let gb = self.resolve(inner.repository.as_ref())?;
-        let resp = gb.get_diff_stats(inner).map_err(into_status)?;
+        let resp = if cache::selectors_are_oid(&inner.base, &inner.head) {
+            cache::cached_response("diff.get_diff_stats", &inner, || {
+                gb.get_diff_stats(inner.clone()).map_err(into_status)
+            })?
+        } else {
+            gb.get_diff_stats(inner).map_err(into_status)?
+        };
         Ok(tonic::Response::new(resp))
     }
 }