Add `stat` to `ToCommit` function for speed (#21337)

Calls to ToCommit are very slow due to fetching diffs, analyzing files.
This patch lets us supply `stat` as false to speed fetching a commit
when we don't need the diff.

/v1/repo/commits has a default `stat` set as true now. Set to false to
experience fetching thousands of commits per second instead of 2-5 per
second.

modules/convert/git_commit.go

@@ -73,7 +73,7 @@ func ToPayloadCommit(repo *repo_model.Repository, c *git.Commit) *api.PayloadCom
 }
 
 // ToCommit convert a git.Commit to api.Commit
-func ToCommit(repo *repo_model.Repository, gitRepo *git.Repository, commit *git.Commit, userCache map[string]*user_model.User) (*api.Commit, error) {
+func ToCommit(repo *repo_model.Repository, gitRepo *git.Repository, commit *git.Commit, userCache map[string]*user_model.User, stat bool) (*api.Commit, error) {
 	var apiAuthor, apiCommitter *api.User
 
 	// Retrieve author and committer information
@@ -133,28 +133,7 @@ func ToCommit(repo *repo_model.Repository, gitRepo *git.Repository, commit *git.
 		}
 	}
 
-	// Retrieve files affected by the commit
-	fileStatus, err := git.GetCommitFileStatus(gitRepo.Ctx, repo.RepoPath(), commit.ID.String())
-	if err != nil {
-		return nil, err
-	}
-	affectedFileList := make([]*api.CommitAffectedFiles, 0, len(fileStatus.Added)+len(fileStatus.Removed)+len(fileStatus.Modified))
-	for _, files := range [][]string{fileStatus.Added, fileStatus.Removed, fileStatus.Modified} {
-		for _, filename := range files {
-			affectedFileList = append(affectedFileList, &api.CommitAffectedFiles{
-				Filename: filename,
-			})
-		}
-	}
-
-	diff, err := gitdiff.GetDiff(gitRepo, &gitdiff.DiffOptions{
-		AfterCommitID: commit.ID.String(),
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	return &api.Commit{
+	res := &api.Commit{
 		CommitMeta: &api.CommitMeta{
 			URL:     repo.APIURL() + "/git/commits/" + url.PathEscape(commit.ID.String()),
 			SHA:     commit.ID.String(),
@@ -188,11 +167,37 @@ func ToCommit(repo *repo_model.Repository, gitRepo *git.Repository, commit *git.
 		Author:    apiAuthor,
 		Committer: apiCommitter,
 		Parents:   apiParents,
-		Files:     affectedFileList,
-		Stats: &api.CommitStats{
+	}
+
+	// Retrieve files affected by the commit
+	if stat {
+		fileStatus, err := git.GetCommitFileStatus(gitRepo.Ctx, repo.RepoPath(), commit.ID.String())
+		if err != nil {
+			return nil, err
+		}
+		affectedFileList := make([]*api.CommitAffectedFiles, 0, len(fileStatus.Added)+len(fileStatus.Removed)+len(fileStatus.Modified))
+		for _, files := range [][]string{fileStatus.Added, fileStatus.Removed, fileStatus.Modified} {
+			for _, filename := range files {
+				affectedFileList = append(affectedFileList, &api.CommitAffectedFiles{
+					Filename: filename,
+				})
+			}
+		}
+
+		diff, err := gitdiff.GetDiff(gitRepo, &gitdiff.DiffOptions{
+			AfterCommitID: commit.ID.String(),
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		res.Files = affectedFileList
+		res.Stats = &api.CommitStats{
 			Total:     diff.TotalAddition + diff.TotalDeletion,
 			Additions: diff.TotalAddition,
 			Deletions: diff.TotalDeletion,
-		},
-	}, nil
+		}
+	}
+
+	return res, nil
 }

routers/api/v1/repo/commits.go

@@ -70,7 +70,7 @@ func getCommit(ctx *context.APIContext, identifier string) {
 		return
 	}
 
-	json, err := convert.ToCommit(ctx.Repo.Repository, ctx.Repo.GitRepo, commit, nil)
+	json, err := convert.ToCommit(ctx.Repo.Repository, ctx.Repo.GitRepo, commit, nil, true)
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "toCommit", err)
 		return
@@ -104,6 +104,10 @@ func GetAllCommits(ctx *context.APIContext) {
 	//   in: query
 	//   description: filepath of a file/dir
 	//   type: string
+	// - name: stat
+	//   in: query
+	//   description: include diff stats for every commit (disable for speedup, default 'true')
+	//   type: boolean
 	// - name: page
 	//   in: query
 	//   description: page number of results to return (1-based)
@@ -209,9 +213,12 @@ func GetAllCommits(ctx *context.APIContext) {
 	userCache := make(map[string]*user_model.User)
 
 	apiCommits := make([]*api.Commit, len(commits))
+
+	stat := ctx.FormString("stat") == "" || ctx.FormBool("stat")
+
 	for i, commit := range commits {
 		// Create json struct
-		apiCommits[i], err = convert.ToCommit(ctx.Repo.Repository, ctx.Repo.GitRepo, commit, userCache)
+		apiCommits[i], err = convert.ToCommit(ctx.Repo.Repository, ctx.Repo.GitRepo, commit, userCache, stat)
 		if err != nil {
 			ctx.Error(http.StatusInternalServerError, "toCommit", err)
 			return

routers/api/v1/repo/notes.go

@@ -69,7 +69,7 @@ func getNote(ctx *context.APIContext, identifier string) {
 		return
 	}
 
-	cmt, err := convert.ToCommit(ctx.Repo.Repository, ctx.Repo.GitRepo, note.Commit, nil)
+	cmt, err := convert.ToCommit(ctx.Repo.Repository, ctx.Repo.GitRepo, note.Commit, nil, true)
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "ToCommit", err)
 		return

routers/api/v1/repo/pull.go

@@ -1306,7 +1306,7 @@ func GetPullRequestCommits(ctx *context.APIContext) {
 
 	apiCommits := make([]*api.Commit, 0, end-start)
 	for i := start; i < end; i++ {
-		apiCommit, err := convert.ToCommit(ctx.Repo.Repository, baseGitRepo, commits[i], userCache)
+		apiCommit, err := convert.ToCommit(ctx.Repo.Repository, baseGitRepo, commits[i], userCache, true)
 		if err != nil {
 			ctx.ServerError("toCommit", err)
 			return

templates/swagger/v1_json.tmpl

@@ -3264,6 +3264,12 @@
             "name": "path",
             "in": "query"
           },
+          {
+            "type": "boolean",
+            "description": "include diff stats for every commit (disable for speedup, default 'true')",
+            "name": "stat",
+            "in": "query"
+          },
           {
             "type": "integer",
             "description": "page number of results to return (1-based)",