From 57e4f34b4613c09beb0cb757ac2ba2b43cc04daf Mon Sep 17 00:00:00 2001 From: Christian Cleberg Date: Wed, 6 May 2026 20:30:34 -0500 Subject: feat: add persistent stale-while-revalidate API cache Introduce an actor-backed persistent cache layer at the SRHTClient boundary for read-only SourceHut data. Cache entries now store stable metadata including key, resource type, fetched/expires/access timestamps, payload hash, schema version, and payload size, with bounded memory and disk usage. Add centralized cache key builders and TTL defaults for repository, file, ticket, build, log, profile, status, and list-style resources. Support networkOnly, cacheOnly, cacheFirstThenRefresh, and refreshIgnoringCache policies, plus request coalescing for duplicate in-flight cache keys. Integrate first-pass caching into high-value low-risk read paths: - build detail and completed/active build logs - ticket detail - README lookup - repository tree, blob, and linked file reads Keep mutation paths network-only and add simple prefix invalidation after ticket and build mutations. Add compact cached/stale UI status rows and a Settings action to clear the persistent cache. Add focused cache tests covering round trips, expiration, stale fallback, policy behavior, request coalescing, prefix invalidation, size limits, LRU pruning, expired pruning, and mutation bypass behavior. Document storage, key, TTL, invalidation, limitations, and next recommended targets. --- Hutch/Views/Repositories/FileTreeViewModel.swift | 61 ++++++++++++++++++------ 1 file changed, 47 insertions(+), 14 deletions(-) (limited to 'Hutch/Views/Repositories/FileTreeViewModel.swift') diff --git a/Hutch/Views/Repositories/FileTreeViewModel.swift b/Hutch/Views/Repositories/FileTreeViewModel.swift index 9ccd74b..11f9e7f 100644 --- a/Hutch/Views/Repositories/FileTreeViewModel.swift +++ b/Hutch/Views/Repositories/FileTreeViewModel.swift @@ -90,6 +90,7 @@ final class FileTreeViewModel { private(set) var viewingObject: GitObject? private(set) var isLoading = false + private(set) var cacheMetadata: CacheEntryMetadata? var error: String? // Available references for the branch/tag picker @@ -285,12 +286,18 @@ final class FileTreeViewModel { do { let result: RevparseResponse do { - result = try await client.execute( + let cached = try await client.executeCached( service: service, query: Self.rootTreeQuery, variables: variables, - responseType: RevparseResponse.self + responseType: RevparseResponse.self, + cacheKey: APICacheKeys.treeRoot(service: service, rid: repositoryRid, ref: revspec), + resourceType: .repositoryTree, + ttl: APICacheTTLs.movingRefFileContent, + policy: .cacheFirstThenRefresh ) + result = cached.value + cacheMetadata = cached.metadata } catch { if isMissingGitReferenceError(error) { navStack = [FileNavEntry(name: "root", treeId: "")] @@ -375,12 +382,18 @@ final class FileTreeViewModel { ] do { - let result = try await client.execute( + let cached = try await client.executeCached( service: service, query: Self.subtreeQuery, variables: variables, - responseType: SubtreeResponse.self + responseType: SubtreeResponse.self, + cacheKey: APICacheKeys.treeEntries(service: service, rid: repositoryRid, treeId: treeId), + resourceType: .repositoryTree, + ttl: APICacheTTLs.immutableFileContent, + policy: .cacheFirstThenRefresh ) + let result = cached.value + cacheMetadata = cached.metadata navStack.append(FileNavEntry(name: name, treeId: treeId)) var allEntries = result.repository?.object?.entries?.results ?? [] var cursor = result.repository?.object?.entries?.cursor @@ -407,12 +420,18 @@ final class FileTreeViewModel { ] do { - let result = try await client.execute( + let cached = try await client.executeCached( service: service, query: Self.blobQuery, variables: variables, - responseType: BlobResponse.self + responseType: BlobResponse.self, + cacheKey: APICacheKeys.blob(service: service, rid: repositoryRid, blobId: blobId), + resourceType: .repositoryFile, + ttl: APICacheTTLs.immutableFileContent, + policy: .cacheFirstThenRefresh ) + let result = cached.value + cacheMetadata = cached.metadata viewingEntry = entry viewingObject = result.repository?.object ?? .unknown } catch { @@ -453,12 +472,18 @@ final class FileTreeViewModel { ] do { - let result = try await client.execute( + let cached = try await client.executeCached( service: service, query: Self.subtreeQuery, variables: variables, - responseType: SubtreeResponse.self + responseType: SubtreeResponse.self, + cacheKey: APICacheKeys.treeEntries(service: service, rid: repositoryRid, treeId: targetEntry.treeId), + resourceType: .repositoryTree, + ttl: APICacheTTLs.immutableFileContent, + policy: .cacheFirstThenRefresh ) + let result = cached.value + cacheMetadata = cached.metadata var allEntries = result.repository?.object?.entries?.results ?? [] var cursor = result.repository?.object?.entries?.cursor while let nextCursor = cursor { @@ -480,13 +505,17 @@ final class FileTreeViewModel { "treeId": treeId, "cursor": cursor ] - let result = try await client.execute( + let cached = try await client.executeCached( service: service, query: Self.treeEntriesPageQuery, variables: variables, - responseType: SubtreeResponse.self + responseType: SubtreeResponse.self, + cacheKey: APICacheKeys.treeEntries(service: service, rid: repositoryRid, treeId: treeId, cursor: cursor), + resourceType: .repositoryTree, + ttl: APICacheTTLs.immutableFileContent, + policy: .cacheFirstThenRefresh ) - return result.repository?.object?.entries ?? GitTreeEntryPage(results: [], cursor: nil) + return cached.value.repository?.object?.entries ?? GitTreeEntryPage(results: [], cursor: nil) } // MARK: - Linked File (used by README link interception) @@ -517,13 +546,17 @@ final class FileTreeViewModel { "revspec": revspec, "path": path ] - let result = try await client.execute( + let cached = try await client.executeCached( service: service, query: Self.linkedFileQuery, variables: variables, - responseType: LinkedFileResponse.self + responseType: LinkedFileResponse.self, + cacheKey: APICacheKeys.path(service: service, rid: repositoryRid, ref: revspec, path: path), + resourceType: .repositoryFile, + ttl: revspec == "HEAD" ? APICacheTTLs.movingRefFileContent : APICacheTTLs.immutableFileContent, + policy: .cacheFirstThenRefresh ) - return result.repository?.path + return cached.value.repository?.path } /// Dismiss the file view and go back to the directory listing. -- cgit v1.2.3