Slightly simplify LastCommitCache (#20444)

The LastCommitCache code is a little complex and there is unnecessary
duplication between the gogit and nogogit variants.

This PR adds the LastCommitCache as a field to the git.Repository and
pre-creates it in the ReferencesGit helpers etc. There has been some
simplification and unification of the variant code.

Signed-off-by: Andrew Thornton <art27@cantab.net>

modules/context/repo.go

@@ -1001,6 +1001,8 @@ func RepoRefByType(refType RepoRefType, ignoreNotExistErr ...bool) func(*Context
 			return
 		}
 		ctx.Data["CommitsCount"] = ctx.Repo.CommitsCount
+		ctx.Repo.GitRepo.LastCommitCache = git.NewLastCommitCache(ctx.Repo.CommitsCount, ctx.Repo.Repository.FullName(), ctx.Repo.GitRepo, cache.GetCache())
+
 		return cancel
 	}
 }

modules/git/commit.go

@@ -80,6 +80,9 @@ func (c *Commit) ParentCount() int {
 
 // GetCommitByPath return the commit of relative path object.
 func (c *Commit) GetCommitByPath(relpath string) (*Commit, error) {
+	if c.repo.LastCommitCache != nil {
+		return c.repo.LastCommitCache.GetCommitByPath(c.ID.String(), relpath)
+	}
 	return c.repo.getCommitByPathWithID(c.ID, relpath)
 }
 

modules/git/commit_info_gogit.go

@@ -17,7 +17,7 @@ import (
 )
 
 // GetCommitsInfo gets information of all commits that are corresponding to these entries
-func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath string, cache *LastCommitCache) ([]CommitInfo, *Commit, error) {
+func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath string) ([]CommitInfo, *Commit, error) {
 	entryPaths := make([]string, len(tes)+1)
 	// Get the commit for the treePath itself
 	entryPaths[0] = ""
@@ -35,15 +35,15 @@ func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath
 		return nil, nil, err
 	}
 
-	var revs map[string]*object.Commit
-	if cache != nil {
+	var revs map[string]*Commit
+	if commit.repo.LastCommitCache != nil {
 		var unHitPaths []string
-		revs, unHitPaths, err = getLastCommitForPathsByCache(commit.ID.String(), treePath, entryPaths, cache)
+		revs, unHitPaths, err = getLastCommitForPathsByCache(commit.ID.String(), treePath, entryPaths, commit.repo.LastCommitCache)
 		if err != nil {
 			return nil, nil, err
 		}
 		if len(unHitPaths) > 0 {
-			revs2, err := GetLastCommitForPaths(ctx, cache, c, treePath, unHitPaths)
+			revs2, err := GetLastCommitForPaths(ctx, commit.repo.LastCommitCache, c, treePath, unHitPaths)
 			if err != nil {
 				return nil, nil, err
 			}
@@ -68,8 +68,7 @@ func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath
 		}
 
 		// Check if we have found a commit for this entry in time
-		if rev, ok := revs[entry.Name()]; ok {
-			entryCommit := convertCommit(rev)
+		if entryCommit, ok := revs[entry.Name()]; ok {
 			commitsInfo[i].Commit = entryCommit
 		}
 
@@ -96,10 +95,10 @@ func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath
 	// get it for free during the tree traversal and it's used for listing
 	// pages to display information about newest commit for a given path.
 	var treeCommit *Commit
+	var ok bool
 	if treePath == "" {
 		treeCommit = commit
-	} else if rev, ok := revs[""]; ok {
-		treeCommit = convertCommit(rev)
+	} else if treeCommit, ok = revs[""]; ok {
 		treeCommit.repo = commit.repo
 	}
 	return commitsInfo, treeCommit, nil
@@ -155,16 +154,16 @@ func getFileHashes(c cgobject.CommitNode, treePath string, paths []string) (map[
 	return hashes, nil
 }
 
-func getLastCommitForPathsByCache(commitID, treePath string, paths []string, cache *LastCommitCache) (map[string]*object.Commit, []string, error) {
+func getLastCommitForPathsByCache(commitID, treePath string, paths []string, cache *LastCommitCache) (map[string]*Commit, []string, error) {
 	var unHitEntryPaths []string
-	results := make(map[string]*object.Commit)
+	results := make(map[string]*Commit)
 	for _, p := range paths {
 		lastCommit, err := cache.Get(commitID, path.Join(treePath, p))
 		if err != nil {
 			return nil, nil, err
 		}
 		if lastCommit != nil {
-			results[p] = lastCommit.(*object.Commit)
+			results[p] = lastCommit
 			continue
 		}
 
@@ -175,7 +174,7 @@ func getLastCommitForPathsByCache(commitID, treePath string, paths []string, cac
 }
 
 // GetLastCommitForPaths returns last commit information
-func GetLastCommitForPaths(ctx context.Context, cache *LastCommitCache, c cgobject.CommitNode, treePath string, paths []string) (map[string]*object.Commit, error) {
+func GetLastCommitForPaths(ctx context.Context, cache *LastCommitCache, c cgobject.CommitNode, treePath string, paths []string) (map[string]*Commit, error) {
 	refSha := c.ID().String()
 
 	// We do a tree traversal with nodes sorted by commit time
@@ -293,13 +292,13 @@ heaploop:
 	}
 
 	// Post-processing
-	result := make(map[string]*object.Commit)
+	result := make(map[string]*Commit)
 	for path, commitNode := range resultNodes {
-		var err error
-		result[path], err = commitNode.Commit()
+		commit, err := commitNode.Commit()
 		if err != nil {
 			return nil, err
 		}
+		result[path] = convertCommit(commit)
 	}
 
 	return result, nil

modules/git/commit_info_nogogit.go

@@ -17,7 +17,7 @@ import (
 )
 
 // GetCommitsInfo gets information of all commits that are corresponding to these entries
-func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath string, cache *LastCommitCache) ([]CommitInfo, *Commit, error) {
+func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath string) ([]CommitInfo, *Commit, error) {
 	entryPaths := make([]string, len(tes)+1)
 	// Get the commit for the treePath itself
 	entryPaths[0] = ""
@@ -28,15 +28,15 @@ func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath
 	var err error
 
 	var revs map[string]*Commit
-	if cache != nil {
+	if commit.repo.LastCommitCache != nil {
 		var unHitPaths []string
-		revs, unHitPaths, err = getLastCommitForPathsByCache(ctx, commit.ID.String(), treePath, entryPaths, cache)
+		revs, unHitPaths, err = getLastCommitForPathsByCache(ctx, commit.ID.String(), treePath, entryPaths, commit.repo.LastCommitCache)
 		if err != nil {
 			return nil, nil, err
 		}
 		if len(unHitPaths) > 0 {
 			sort.Strings(unHitPaths)
-			commits, err := GetLastCommitForPaths(ctx, cache, commit, treePath, unHitPaths)
+			commits, err := GetLastCommitForPaths(ctx, commit, treePath, unHitPaths)
 			if err != nil {
 				return nil, nil, err
 			}
@@ -47,7 +47,7 @@ func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath
 		}
 	} else {
 		sort.Strings(entryPaths)
-		revs, err = GetLastCommitForPaths(ctx, nil, commit, treePath, entryPaths)
+		revs, err = GetLastCommitForPaths(ctx, commit, treePath, entryPaths)
 	}
 	if err != nil {
 		return nil, nil, err
@@ -99,18 +99,15 @@ func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath
 }
 
 func getLastCommitForPathsByCache(ctx context.Context, commitID, treePath string, paths []string, cache *LastCommitCache) (map[string]*Commit, []string, error) {
-	wr, rd, cancel := cache.repo.CatFileBatch(ctx)
-	defer cancel()
-
 	var unHitEntryPaths []string
 	results := make(map[string]*Commit)
 	for _, p := range paths {
-		lastCommit, err := cache.Get(commitID, path.Join(treePath, p), wr, rd)
+		lastCommit, err := cache.Get(commitID, path.Join(treePath, p))
 		if err != nil {
 			return nil, nil, err
 		}
 		if lastCommit != nil {
-			results[p] = lastCommit.(*Commit)
+			results[p] = lastCommit
 			continue
 		}
 
@@ -121,9 +118,9 @@ func getLastCommitForPathsByCache(ctx context.Context, commitID, treePath string
 }
 
 // GetLastCommitForPaths returns last commit information
-func GetLastCommitForPaths(ctx context.Context, cache *LastCommitCache, commit *Commit, treePath string, paths []string) (map[string]*Commit, error) {
+func GetLastCommitForPaths(ctx context.Context, commit *Commit, treePath string, paths []string) (map[string]*Commit, error) {
 	// We read backwards from the commit to obtain all of the commits
-	revs, err := WalkGitLog(ctx, cache, commit.repo, commit, treePath, paths...)
+	revs, err := WalkGitLog(ctx, commit.repo, commit, treePath, paths...)
 	if err != nil {
 		return nil, err
 	}

modules/git/commit_info_test.go

@@ -91,7 +91,7 @@ func testGetCommitsInfo(t *testing.T, repo1 *Repository) {
 		}
 
 		// FIXME: Context.TODO() - if graceful has started we should use its Shutdown context otherwise use install signals in TestMain.
-		commitsInfo, treeCommit, err := entries.GetCommitsInfo(context.TODO(), commit, testCase.Path, nil)
+		commitsInfo, treeCommit, err := entries.GetCommitsInfo(context.TODO(), commit, testCase.Path)
 		assert.NoError(t, err, "Unable to get commit information for entries of subtree: %s in commit: %s from testcase due to error: %v", testCase.Path, testCase.CommitID, err)
 		if err != nil {
 			t.FailNow()
@@ -170,7 +170,7 @@ func BenchmarkEntries_GetCommitsInfo(b *testing.B) {
 		b.ResetTimer()
 		b.Run(benchmark.name, func(b *testing.B) {
 			for i := 0; i < b.N; i++ {
-				_, _, err := entries.GetCommitsInfo(context.Background(), commit, "", nil)
+				_, _, err := entries.GetCommitsInfo(context.Background(), commit, "")
 				if err != nil {
 					b.Fatal(err)
 				}

modules/git/last_commit_cache.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
 )
 
 // Cache represents a caching interface
@@ -19,16 +20,96 @@ type Cache interface {
 	Get(key string) interface{}
 }
 
-func (c *LastCommitCache) getCacheKey(repoPath, ref, entryPath string) string {
-	hashBytes := sha256.Sum256([]byte(fmt.Sprintf("%s:%s:%s", repoPath, ref, entryPath)))
+func getCacheKey(repoPath, commitID, entryPath string) string {
+	hashBytes := sha256.Sum256([]byte(fmt.Sprintf("%s:%s:%s", repoPath, commitID, entryPath)))
 	return fmt.Sprintf("last_commit:%x", hashBytes)
 }
 
+// LastCommitCache represents a cache to store last commit
+type LastCommitCache struct {
+	repoPath    string
+	ttl         func() int64
+	repo        *Repository
+	commitCache map[string]*Commit
+	cache       Cache
+}
+
+// NewLastCommitCache creates a new last commit cache for repo
+func NewLastCommitCache(count int64, repoPath string, gitRepo *Repository, cache Cache) *LastCommitCache {
+	if cache == nil {
+		return nil
+	}
+	if !setting.CacheService.LastCommit.Enabled || count < setting.CacheService.LastCommit.CommitsCount {
+		return nil
+	}
+
+	return &LastCommitCache{
+		repoPath: repoPath,
+		repo:     gitRepo,
+		ttl:      setting.LastCommitCacheTTLSeconds,
+		cache:    cache,
+	}
+}
+
 // Put put the last commit id with commit and entry path
 func (c *LastCommitCache) Put(ref, entryPath, commitID string) error {
 	if c == nil || c.cache == nil {
 		return nil
 	}
 	log.Debug("LastCommitCache save: [%s:%s:%s]", ref, entryPath, commitID)
-	return c.cache.Put(c.getCacheKey(c.repoPath, ref, entryPath), commitID, c.ttl())
+	return c.cache.Put(getCacheKey(c.repoPath, ref, entryPath), commitID, c.ttl())
+}
+
+// Get gets the last commit information by commit id and entry path
+func (c *LastCommitCache) Get(ref, entryPath string) (*Commit, error) {
+	if c == nil || c.cache == nil {
+		return nil, nil
+	}
+
+	commitID, ok := c.cache.Get(getCacheKey(c.repoPath, ref, entryPath)).(string)
+	if !ok || commitID == "" {
+		return nil, nil
+	}
+
+	log.Debug("LastCommitCache hit level 1: [%s:%s:%s]", ref, entryPath, commitID)
+	if c.commitCache != nil {
+		if commit, ok := c.commitCache[commitID]; ok {
+			log.Debug("LastCommitCache hit level 2: [%s:%s:%s]", ref, entryPath, commitID)
+			return commit, nil
+		}
+	}
+
+	commit, err := c.repo.GetCommit(commitID)
+	if err != nil {
+		return nil, err
+	}
+	if c.commitCache == nil {
+		c.commitCache = make(map[string]*Commit)
+	}
+	c.commitCache[commitID] = commit
+	return commit, nil
+}
+
+// GetCommitByPath gets the last commit for the entry in the provided commit
+func (c *LastCommitCache) GetCommitByPath(commitID, entryPath string) (*Commit, error) {
+	sha1, err := NewIDFromString(commitID)
+	if err != nil {
+		return nil, err
+	}
+
+	lastCommit, err := c.Get(sha1.String(), entryPath)
+	if err != nil || lastCommit != nil {
+		return lastCommit, err
+	}
+
+	lastCommit, err = c.repo.getCommitByPathWithID(sha1, entryPath)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := c.Put(commitID, entryPath, lastCommit.ID.String()); err != nil {
+		log.Error("Unable to cache %s as the last commit for %q in %s %s. Error %v", lastCommit.ID.String(), entryPath, commitID, c.repoPath, err)
+	}
+
+	return lastCommit, nil
 }

modules/git/last_commit_cache_gogit.go

@@ -9,71 +9,25 @@ package git
 import (
 	"context"
 
-	"code.gitea.io/gitea/modules/log"
-
-	"github.com/go-git/go-git/v5/plumbing/object"
 	cgobject "github.com/go-git/go-git/v5/plumbing/object/commitgraph"
 )
 
-// LastCommitCache represents a cache to store last commit
-type LastCommitCache struct {
-	repoPath    string
-	ttl         func() int64
-	repo        *Repository
-	commitCache map[string]*object.Commit
-	cache       Cache
-}
-
-// NewLastCommitCache creates a new last commit cache for repo
-func NewLastCommitCache(repoPath string, gitRepo *Repository, ttl func() int64, cache Cache) *LastCommitCache {
-	if cache == nil {
+// CacheCommit will cache the commit from the gitRepository
+func (c *Commit) CacheCommit(ctx context.Context) error {
+	if c.repo.LastCommitCache == nil {
 		return nil
 	}
-	return &LastCommitCache{
-		repoPath:    repoPath,
-		repo:        gitRepo,
-		commitCache: make(map[string]*object.Commit),
-		ttl:         ttl,
-		cache:       cache,
-	}
-}
-
-// Get get the last commit information by commit id and entry path
-func (c *LastCommitCache) Get(ref, entryPath string) (interface{}, error) {
-	v := c.cache.Get(c.getCacheKey(c.repoPath, ref, entryPath))
-	if vs, ok := v.(string); ok {
-		log.Debug("LastCommitCache hit level 1: [%s:%s:%s]", ref, entryPath, vs)
-		if commit, ok := c.commitCache[vs]; ok {
-			log.Debug("LastCommitCache hit level 2: [%s:%s:%s]", ref, entryPath, vs)
-			return commit, nil
-		}
-		id, err := c.repo.ConvertToSHA1(vs)
-		if err != nil {
-			return nil, err
-		}
-		commit, err := c.repo.GoGitRepo().CommitObject(id)
-		if err != nil {
-			return nil, err
-		}
-		c.commitCache[vs] = commit
-		return commit, nil
-	}
-	return nil, nil
-}
-
-// CacheCommit will cache the commit from the gitRepository
-func (c *LastCommitCache) CacheCommit(ctx context.Context, commit *Commit) error {
-	commitNodeIndex, _ := commit.repo.CommitNodeIndex()
+	commitNodeIndex, _ := c.repo.CommitNodeIndex()
 
-	index, err := commitNodeIndex.Get(commit.ID)
+	index, err := commitNodeIndex.Get(c.ID)
 	if err != nil {
 		return err
 	}
 
-	return c.recursiveCache(ctx, index, &commit.Tree, "", 1)
+	return c.recursiveCache(ctx, index, &c.Tree, "", 1)
 }
 
-func (c *LastCommitCache) recursiveCache(ctx context.Context, index cgobject.CommitNode, tree *Tree, treePath string, level int) error {
+func (c *Commit) recursiveCache(ctx context.Context, index cgobject.CommitNode, tree *Tree, treePath string, level int) error {
 	if level == 0 {
 		return nil
 	}
@@ -90,7 +44,7 @@ func (c *LastCommitCache) recursiveCache(ctx context.Context, index cgobject.Com
 		entryMap[entry.Name()] = entry
 	}
 
-	commits, err := GetLastCommitForPaths(ctx, c, index, treePath, entryPaths)
+	commits, err := GetLastCommitForPaths(ctx, c.repo.LastCommitCache, index, treePath, entryPaths)
 	if err != nil {
 		return err
 	}

modules/git/last_commit_cache_nogogit.go

@@ -7,67 +7,18 @@
 package git
 
 import (
-	"bufio"
 	"context"
-
-	"code.gitea.io/gitea/modules/log"
 )
 
-// LastCommitCache represents a cache to store last commit
-type LastCommitCache struct {
-	repoPath    string
-	ttl         func() int64
-	repo        *Repository
-	commitCache map[string]*Commit
-	cache       Cache
-}
-
-// NewLastCommitCache creates a new last commit cache for repo
-func NewLastCommitCache(repoPath string, gitRepo *Repository, ttl func() int64, cache Cache) *LastCommitCache {
-	if cache == nil {
+// CacheCommit will cache the commit from the gitRepository
+func (c *Commit) CacheCommit(ctx context.Context) error {
+	if c.repo.LastCommitCache == nil {
 		return nil
 	}
-	return &LastCommitCache{
-		repoPath:    repoPath,
-		repo:        gitRepo,
-		commitCache: make(map[string]*Commit),
-		ttl:         ttl,
-		cache:       cache,
-	}
-}
-
-// Get get the last commit information by commit id and entry path
-func (c *LastCommitCache) Get(ref, entryPath string, wr WriteCloserError, rd *bufio.Reader) (interface{}, error) {
-	v := c.cache.Get(c.getCacheKey(c.repoPath, ref, entryPath))
-	if vs, ok := v.(string); ok {
-		log.Debug("LastCommitCache hit level 1: [%s:%s:%s]", ref, entryPath, vs)
-		if commit, ok := c.commitCache[vs]; ok {
-			log.Debug("LastCommitCache hit level 2: [%s:%s:%s]", ref, entryPath, vs)
-			return commit, nil
-		}
-		id, err := c.repo.ConvertToSHA1(vs)
-		if err != nil {
-			return nil, err
-		}
-		if _, err := wr.Write([]byte(vs + "\n")); err != nil {
-			return nil, err
-		}
-		commit, err := c.repo.getCommitFromBatchReader(rd, id)
-		if err != nil {
-			return nil, err
-		}
-		c.commitCache[vs] = commit
-		return commit, nil
-	}
-	return nil, nil
-}
-
-// CacheCommit will cache the commit from the gitRepository
-func (c *LastCommitCache) CacheCommit(ctx context.Context, commit *Commit) error {
-	return c.recursiveCache(ctx, commit, &commit.Tree, "", 1)
+	return c.recursiveCache(ctx, &c.Tree, "", 1)
 }
 
-func (c *LastCommitCache) recursiveCache(ctx context.Context, commit *Commit, tree *Tree, treePath string, level int) error {
+func (c *Commit) recursiveCache(ctx context.Context, tree *Tree, treePath string, level int) error {
 	if level == 0 {
 		return nil
 	}
@@ -82,7 +33,7 @@ func (c *LastCommitCache) recursiveCache(ctx context.Context, commit *Commit, tr
 		entryPaths[i] = entry.Name()
 	}
 
-	_, err = WalkGitLog(ctx, c, commit.repo, commit, treePath, entryPaths...)
+	_, err = WalkGitLog(ctx, c.repo, c, treePath, entryPaths...)
 	if err != nil {
 		return err
 	}
@@ -94,7 +45,7 @@ func (c *LastCommitCache) recursiveCache(ctx context.Context, commit *Commit, tr
 			if err != nil {
 				return err
 			}
-			if err := c.recursiveCache(ctx, commit, subTree, treeEntry.Name(), level-1); err != nil {
+			if err := c.recursiveCache(ctx, subTree, treeEntry.Name(), level-1); err != nil {
 				return err
 			}
 		}

modules/git/log_name_status.go

@@ -281,7 +281,7 @@ func (g *LogNameStatusRepoParser) Close() {
 }
 
 // WalkGitLog walks the git log --name-status for the head commit in the provided treepath and files
-func WalkGitLog(ctx context.Context, cache *LastCommitCache, repo *Repository, head *Commit, treepath string, paths ...string) (map[string]string, error) {
+func WalkGitLog(ctx context.Context, repo *Repository, head *Commit, treepath string, paths ...string) (map[string]string, error) {
 	headRef := head.ID.String()
 
 	tree, err := head.SubTree(treepath)
@@ -374,14 +374,14 @@ heaploop:
 				changed[i] = false
 				if results[i] == "" {
 					results[i] = current.CommitID
-					if err := cache.Put(headRef, path.Join(treepath, paths[i]), current.CommitID); err != nil {
+					if err := repo.LastCommitCache.Put(headRef, path.Join(treepath, paths[i]), current.CommitID); err != nil {
 						return nil, err
 					}
 					delete(path2idx, paths[i])
 					remaining--
 					if results[0] == "" {
 						results[0] = current.CommitID
-						if err := cache.Put(headRef, treepath, current.CommitID); err != nil {
+						if err := repo.LastCommitCache.Put(headRef, treepath, current.CommitID); err != nil {
 							return nil, err
 						}
 						delete(path2idx, "")

modules/git/notes_gogit.go

@@ -83,7 +83,7 @@ func GetNote(ctx context.Context, repo *Repository, commitID string, note *Note)
 		log.Error("Unable to get the commit for the path %q. Error: %v", path, err)
 		return err
 	}
-	note.Commit = convertCommit(lastCommits[path])
+	note.Commit = lastCommits[path]
 
 	return nil
 }

modules/git/notes_nogogit.go

@@ -81,7 +81,7 @@ func GetNote(ctx context.Context, repo *Repository, commitID string, note *Note)
 		path = path[idx+1:]
 	}
 
-	lastCommits, err := GetLastCommitForPaths(ctx, nil, notes, treePath, []string{path})
+	lastCommits, err := GetLastCommitForPaths(ctx, notes, treePath, []string{path})
 	if err != nil {
 		log.Error("Unable to get the commit for the path %q. Error: %v", treePath, err)
 		return err

modules/git/repo_base_gogit.go

@@ -31,7 +31,8 @@ type Repository struct {
 	gogitStorage *filesystem.Storage
 	gpgSettings  *GPGSettings
 
-	Ctx context.Context
+	Ctx             context.Context
+	LastCommitCache *LastCommitCache
 }
 
 // openRepositoryWithDefaultContext opens the repository at the given path with DefaultContext.
@@ -79,6 +80,8 @@ func (repo *Repository) Close() (err error) {
 	if err := repo.gogitStorage.Close(); err != nil {
 		gitealog.Error("Error closing storage: %v", err)
 	}
+	repo.LastCommitCache = nil
+	repo.tagCache = nil
 	return
 }
 

modules/git/repo_base_nogogit.go

@@ -32,7 +32,8 @@ type Repository struct {
 	checkReader *bufio.Reader
 	checkWriter WriteCloserError
 
-	Ctx context.Context
+	Ctx             context.Context
+	LastCommitCache *LastCommitCache
 }
 
 // openRepositoryWithDefaultContext opens the repository at the given path with DefaultContext.
@@ -101,5 +102,7 @@ func (repo *Repository) Close() (err error) {
 		repo.checkReader = nil
 		repo.checkWriter = nil
 	}
+	repo.LastCommitCache = nil
+	repo.tagCache = nil
 	return err
 }

routers/api/v1/repo/file.go

@@ -18,7 +18,6 @@ import (
 	git_model "code.gitea.io/gitea/models/git"
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unit"
-	"code.gitea.io/gitea/modules/cache"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/httpcache"
@@ -240,12 +239,7 @@ func getBlobForEntry(ctx *context.APIContext) (blob *git.Blob, entry *git.TreeEn
 		return
 	}
 
-	var c *git.LastCommitCache
-	if setting.CacheService.LastCommit.Enabled && ctx.Repo.CommitsCount >= setting.CacheService.LastCommit.CommitsCount {
-		c = git.NewLastCommitCache(ctx.Repo.Repository.FullName(), ctx.Repo.GitRepo, setting.LastCommitCacheTTLSeconds, cache.GetCache())
-	}
-
-	info, _, err := git.Entries([]*git.TreeEntry{entry}).GetCommitsInfo(ctx, ctx.Repo.Commit, path.Dir("/" + ctx.Repo.TreePath)[1:], c)
+	info, _, err := git.Entries([]*git.TreeEntry{entry}).GetCommitsInfo(ctx, ctx.Repo.Commit, path.Dir("/" + ctx.Repo.TreePath)[1:])
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "GetCommitsInfo", err)
 		return

routers/api/v1/utils/git.go

@@ -8,8 +8,10 @@ import (
 	"fmt"
 	"net/http"
 
+	"code.gitea.io/gitea/modules/cache"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/log"
 )
 
 // ResolveRefOrSha resolve ref to sha if exist
@@ -19,6 +21,7 @@ func ResolveRefOrSha(ctx *context.APIContext, ref string) string {
 		return ""
 	}
 
+	sha := ref
 	// Search branches and tags
 	for _, refType := range []string{"heads", "tags"} {
 		refSHA, lastMethodName, err := searchRefCommitByType(ctx, refType, ref)
@@ -27,10 +30,27 @@ func ResolveRefOrSha(ctx *context.APIContext, ref string) string {
 			return ""
 		}
 		if refSHA != "" {
-			return refSHA
+			sha = refSHA
+			break
 		}
 	}
-	return ref
+
+	if ctx.Repo.GitRepo != nil && ctx.Repo.GitRepo.LastCommitCache == nil {
+		commitsCount, err := cache.GetInt64(ctx.Repo.Repository.GetCommitsCountCacheKey(ref, true), func() (int64, error) {
+			commit, err := ctx.Repo.GitRepo.GetCommit(sha)
+			if err != nil {
+				return 0, err
+			}
+			return commit.CommitsCount()
+		})
+		if err != nil {
+			log.Error("Unable to get commits count for %s in %s. Error: %v", sha, ctx.Repo.Repository.FullName(), err)
+			return sha
+		}
+		ctx.Repo.GitRepo.LastCommitCache = git.NewLastCommitCache(commitsCount, ctx.Repo.Repository.FullName(), ctx.Repo.GitRepo, cache.GetCache())
+	}
+
+	return sha
 }
 
 // GetGitRefs return git references based on filter

routers/web/repo/download.go

@@ -10,7 +10,6 @@ import (
 	"time"
 
 	git_model "code.gitea.io/gitea/models/git"
-	"code.gitea.io/gitea/modules/cache"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/httpcache"
@@ -99,12 +98,7 @@ func getBlobForEntry(ctx *context.Context) (blob *git.Blob, lastModified time.Ti
 		return
 	}
 
-	var c *git.LastCommitCache
-	if setting.CacheService.LastCommit.Enabled && ctx.Repo.CommitsCount >= setting.CacheService.LastCommit.CommitsCount {
-		c = git.NewLastCommitCache(ctx.Repo.Repository.FullName(), ctx.Repo.GitRepo, setting.LastCommitCacheTTLSeconds, cache.GetCache())
-	}
-
-	info, _, err := git.Entries([]*git.TreeEntry{entry}).GetCommitsInfo(ctx, ctx.Repo.Commit, path.Dir("/" + ctx.Repo.TreePath)[1:], c)
+	info, _, err := git.Entries([]*git.TreeEntry{entry}).GetCommitsInfo(ctx, ctx.Repo.Commit, path.Dir("/" + ctx.Repo.TreePath)[1:])
 	if err != nil {
 		ctx.ServerError("GetCommitsInfo", err)
 		return

routers/web/repo/view.go

@@ -27,7 +27,6 @@ import (
 	unit_model "code.gitea.io/gitea/models/unit"
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/base"
-	"code.gitea.io/gitea/modules/cache"
 	"code.gitea.io/gitea/modules/charset"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/git"
@@ -812,11 +811,6 @@ func renderDirectoryFiles(ctx *context.Context, timeout time.Duration) git.Entri
 		defer cancel()
 	}
 
-	var c *git.LastCommitCache
-	if setting.CacheService.LastCommit.Enabled && ctx.Repo.CommitsCount >= setting.CacheService.LastCommit.CommitsCount {
-		c = git.NewLastCommitCache(ctx.Repo.Repository.FullName(), ctx.Repo.GitRepo, setting.LastCommitCacheTTLSeconds, cache.GetCache())
-	}
-
 	selected := map[string]bool{}
 	for _, pth := range ctx.FormStrings("f[]") {
 		selected[pth] = true
@@ -833,7 +827,7 @@ func renderDirectoryFiles(ctx *context.Context, timeout time.Duration) git.Entri
 	}
 
 	var latestCommit *git.Commit
-	ctx.Data["Files"], latestCommit, err = entries.GetCommitsInfo(commitInfoCtx, ctx.Repo.Commit, ctx.Repo.TreePath, c)
+	ctx.Data["Files"], latestCommit, err = entries.GetCommitsInfo(commitInfoCtx, ctx.Repo.Commit, ctx.Repo.TreePath)
 	if err != nil {
 		ctx.ServerError("GetCommitsInfo", err)
 		return nil

routers/web/web.go

@@ -12,6 +12,7 @@ import (
 
 	"code.gitea.io/gitea/models/perm"
 	"code.gitea.io/gitea/models/unit"
+	"code.gitea.io/gitea/modules/cache"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/httpcache"
@@ -1011,6 +1012,7 @@ func RegisterRoutes(m *web.Route) {
 				return
 			}
 			ctx.Data["CommitsCount"] = ctx.Repo.CommitsCount
+			ctx.Repo.GitRepo.LastCommitCache = git.NewLastCommitCache(ctx.Repo.CommitsCount, ctx.Repo.Repository.FullName(), ctx.Repo.GitRepo, cache.GetCache())
 		})
 	}, ignSignIn, context.RepoAssignment, context.UnitTypes(), reqRepoReleaseReader)
 

services/repository/cache.go

@@ -34,15 +34,13 @@ func CacheRef(ctx context.Context, repo *repo_model.Repository, gitRepo *git.Rep
 		return err
 	}
 
-	commitsCount, err := cache.GetInt64(repo.GetCommitsCountCacheKey(getRefName(fullRefName), true), commit.CommitsCount)
-	if err != nil {
-		return err
+	if gitRepo.LastCommitCache == nil {
+		commitsCount, err := cache.GetInt64(repo.GetCommitsCountCacheKey(getRefName(fullRefName), true), commit.CommitsCount)
+		if err != nil {
+			return err
+		}
+		gitRepo.LastCommitCache = git.NewLastCommitCache(commitsCount, repo.FullName(), gitRepo, cache.GetCache())
 	}
-	if commitsCount < setting.CacheService.LastCommit.CommitsCount {
-		return nil
-	}
-
-	commitCache := git.NewLastCommitCache(repo.FullName(), gitRepo, setting.LastCommitCacheTTLSeconds, cache.GetCache())
 
-	return commitCache.CacheCommit(ctx, commit)
+	return commit.CacheCommit(ctx)
 }