Defer Last Commit Info (#16467)

One of the biggest reasons for slow repository browsing is that we wait
until last commit information has been generated for all files in the
repository.

This PR proposes deferring this generation to a new POST endpoint that
does the look up outside of the main page request.

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

1 files changed, 24 insertions, 23 deletions

diff --git a/modules/git/commit_info_nogogit.go b/modules/git/commit_info_nogogit.go
index f57355d16e..261252dab1 100644
--- a/modules/git/commit_info_nogogit.go
+++ b/modules/git/commit_info_nogogit.go
@@ -37,21 +37,18 @@ func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath
 		}
 		if len(unHitPaths) > 0 {
 			sort.Strings(unHitPaths)
-			commits, err := GetLastCommitForPaths(ctx, commit, treePath, unHitPaths)
+			commits, err := GetLastCommitForPaths(ctx, cache, commit, treePath, unHitPaths)
 			if err != nil {
 				return nil, nil, err
 			}
 
 			for pth, found := range commits {
-				if err := cache.Put(commit.ID.String(), path.Join(treePath, pth), found.ID.String()); err != nil {
-					return nil, nil, err
-				}
 				revs[pth] = found
 			}
 		}
 	} else {
 		sort.Strings(entryPaths)
-		revs, err = GetLastCommitForPaths(ctx, commit, treePath, entryPaths)
+		revs, err = GetLastCommitForPaths(ctx, nil, commit, treePath, entryPaths)
 	}
 	if err != nil {
 		return nil, nil, err
@@ -62,27 +59,31 @@ func (tes Entries) GetCommitsInfo(ctx context.Context, commit *Commit, treePath
 		commitsInfo[i] = CommitInfo{
 			Entry: entry,
 		}
+
+		// Check if we have found a commit for this entry in time
 		if entryCommit, ok := revs[entry.Name()]; ok {
 			commitsInfo[i].Commit = entryCommit
-			if entry.IsSubModule() {
-				subModuleURL := ""
-				var fullPath string
-				if len(treePath) > 0 {
-					fullPath = treePath + "/" + entry.Name()
-				} else {
-					fullPath = entry.Name()
-				}
-				if subModule, err := commit.GetSubModule(fullPath); err != nil {
-					return nil, nil, err
-				} else if subModule != nil {
-					subModuleURL = subModule.URL
-				}
-				subModuleFile := NewSubModuleFile(entryCommit, subModuleURL, entry.ID.String())
-				commitsInfo[i].SubModuleFile = subModuleFile
-			}
 		} else {
 			log.Debug("missing commit for %s", entry.Name())
 		}
+
+		// If the entry if a submodule add a submodule file for this
+		if entry.IsSubModule() {
+			subModuleURL := ""
+			var fullPath string
+			if len(treePath) > 0 {
+				fullPath = treePath + "/" + entry.Name()
+			} else {
+				fullPath = entry.Name()
+			}
+			if subModule, err := commit.GetSubModule(fullPath); err != nil {
+				return nil, nil, err
+			} else if subModule != nil {
+				subModuleURL = subModule.URL
+			}
+			subModuleFile := NewSubModuleFile(commitsInfo[i].Commit, subModuleURL, entry.ID.String())
+			commitsInfo[i].SubModuleFile = subModuleFile
+		}
 	}
 
 	// Retrieve the commit for the treePath itself (see above). We basically
@@ -121,9 +122,9 @@ func getLastCommitForPathsByCache(ctx context.Context, commitID, treePath string
 }
 
 // GetLastCommitForPaths returns last commit information
-func GetLastCommitForPaths(ctx context.Context, commit *Commit, treePath string, paths []string) (map[string]*Commit, error) {
+func GetLastCommitForPaths(ctx context.Context, cache *LastCommitCache, 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, commit.repo, commit, treePath, paths...)
+	revs, err := WalkGitLog(ctx, cache, commit.repo, commit, treePath, paths...)
 	if err != nil {
 		return nil, err
 	}