From c685eefe4a8ff6e32bc859a3457a5090f58ea8c5 Mon Sep 17 00:00:00 2001
From: Lunny Xiao <xiaolunwen@gmail.com>
Date: Thu, 25 Apr 2024 17:14:23 +0800
Subject: [PATCH] If a repository return no commitstatus, then still cache it
 but not query it from database (#30700)

The previous repository default branch commit status cache will only
store if the commit status has value. So the repository which have no
any commit status will always be fetched from database.

This PR will store the empty state of commit status of a repository into
cache because the cache will be updated once there is a commit status
stored.
---
 .../repository/commitstatus/commitstatus.go   | 22 +++++++++++++------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/services/repository/commitstatus/commitstatus.go b/services/repository/commitstatus/commitstatus.go
index 8a62a603d..444ae04d0 100644
--- a/services/repository/commitstatus/commitstatus.go
+++ b/services/repository/commitstatus/commitstatus.go
@@ -38,12 +38,10 @@ func getCommitStatusCache(repoID int64, branchName string) *commitStatusCacheVal
 	if ok && statusStr != "" {
 		var cv commitStatusCacheValue
 		err := json.Unmarshal([]byte(statusStr), &cv)
-		if err == nil && cv.State != "" {
+		if err == nil {
 			return &cv
 		}
-		if err != nil {
-			log.Warn("getCommitStatusCache: json.Unmarshal failed: %v", err)
-		}
+		log.Warn("getCommitStatusCache: json.Unmarshal failed: %v", err)
 	}
 	return nil
 }
@@ -128,15 +126,22 @@ func CreateCommitStatus(ctx context.Context, repo *repo_model.Repository, creato
 // FindReposLastestCommitStatuses loading repository default branch latest combinded commit status with cache
 func FindReposLastestCommitStatuses(ctx context.Context, repos []*repo_model.Repository) ([]*git_model.CommitStatus, error) {
 	results := make([]*git_model.CommitStatus, len(repos))
+	allCached := true
 	for i, repo := range repos {
 		if cv := getCommitStatusCache(repo.ID, repo.DefaultBranch); cv != nil {
 			results[i] = &git_model.CommitStatus{
 				State:     api.CommitStatusState(cv.State),
 				TargetURL: cv.TargetURL,
 			}
+		} else {
+			allCached = false
 		}
 	}
 
+	if allCached {
+		return results, nil
+	}
+
 	// collect the latest commit of each repo
 	// at most there are dozens of repos (limited by MaxResponseItems), so it's not a big problem at the moment
 	repoBranchNames := make(map[int64]string, len(repos))
@@ -165,10 +170,10 @@ func FindReposLastestCommitStatuses(ctx context.Context, repos []*repo_model.Rep
 		for i, repo := range repos {
 			if repo.ID == summary.RepoID {
 				results[i] = summary
-				_ = slices.DeleteFunc(repoSHAs, func(repoSHA git_model.RepoSHA) bool {
+				repoSHAs = slices.DeleteFunc(repoSHAs, func(repoSHA git_model.RepoSHA) bool {
 					return repoSHA.RepoID == repo.ID
 				})
-				if results[i].State != "" {
+				if results[i] != nil {
 					if err := updateCommitStatusCache(repo.ID, repo.DefaultBranch, results[i].State, results[i].TargetURL); err != nil {
 						log.Error("updateCommitStatusCache[%d:%s] failed: %v", repo.ID, repo.DefaultBranch, err)
 					}
@@ -177,6 +182,9 @@ func FindReposLastestCommitStatuses(ctx context.Context, repos []*repo_model.Rep
 			}
 		}
 	}
+	if len(repoSHAs) == 0 {
+		return results, nil
+	}
 
 	// call the database O(1) times to get the commit statuses for all repos
 	repoToItsLatestCommitStatuses, err := git_model.GetLatestCommitStatusForPairs(ctx, repoSHAs)
@@ -187,7 +195,7 @@ func FindReposLastestCommitStatuses(ctx context.Context, repos []*repo_model.Rep
 	for i, repo := range repos {
 		if results[i] == nil {
 			results[i] = git_model.CalcCommitStatus(repoToItsLatestCommitStatuses[repo.ID])
-			if results[i].State != "" {
+			if results[i] != nil {
 				if err := updateCommitStatusCache(repo.ID, repo.DefaultBranch, results[i].State, results[i].TargetURL); err != nil {
 					log.Error("updateCommitStatusCache[%d:%s] failed: %v", repo.ID, repo.DefaultBranch, err)
 				}