Add commit status summary table to reduce query from commit status table (#30223)

This PR adds a new table named commit status summary to reduce queries
from the commit status table. After this change, commit status summary
table will be used for the final result, commit status table will be for
details.

---------

Co-authored-by: Jason Song <i@wolfogre.com>

models/git/commit_status_summary.go

@@ -0,0 +1,84 @@
+// Copyright 2024 Gitea. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/setting"
+	api "code.gitea.io/gitea/modules/structs"
+
+	"xorm.io/builder"
+)
+
+// CommitStatusSummary holds the latest commit Status of a single Commit
+type CommitStatusSummary struct {
+	ID     int64                 `xorm:"pk autoincr"`
+	RepoID int64                 `xorm:"INDEX UNIQUE(repo_id_sha)"`
+	SHA    string                `xorm:"VARCHAR(64) NOT NULL INDEX UNIQUE(repo_id_sha)"`
+	State  api.CommitStatusState `xorm:"VARCHAR(7) NOT NULL"`
+}
+
+func init() {
+	db.RegisterModel(new(CommitStatusSummary))
+}
+
+type RepoSHA struct {
+	RepoID int64
+	SHA    string
+}
+
+func GetLatestCommitStatusForRepoAndSHAs(ctx context.Context, repoSHAs []RepoSHA) ([]*CommitStatus, error) {
+	cond := builder.NewCond()
+	for _, rs := range repoSHAs {
+		cond = cond.Or(builder.Eq{"repo_id": rs.RepoID, "sha": rs.SHA})
+	}
+
+	var summaries []CommitStatusSummary
+	if err := db.GetEngine(ctx).Where(cond).Find(&summaries); err != nil {
+		return nil, err
+	}
+
+	commitStatuses := make([]*CommitStatus, 0, len(repoSHAs))
+	for _, summary := range summaries {
+		commitStatuses = append(commitStatuses, &CommitStatus{
+			RepoID: summary.RepoID,
+			SHA:    summary.SHA,
+			State:  summary.State,
+		})
+	}
+	return commitStatuses, nil
+}
+
+func UpdateCommitStatusSummary(ctx context.Context, repoID int64, sha string) error {
+	commitStatuses, _, err := GetLatestCommitStatus(ctx, repoID, sha, db.ListOptionsAll)
+	if err != nil {
+		return err
+	}
+	state := CalcCommitStatus(commitStatuses)
+	// mysql will return 0 when update a record which state hasn't been changed which behaviour is different from other database,
+	// so we need to use insert in on duplicate
+	if setting.Database.Type.IsMySQL() {
+		_, err := db.GetEngine(ctx).Exec("INSERT INTO commit_status_summary (repo_id,sha,state) VALUES (?,?,?) ON DUPLICATE KEY UPDATE state=?",
+			repoID, sha, state.State, state.State)
+		return err
+	}
+
+	if cnt, err := db.GetEngine(ctx).Where("repo_id=? AND sha=?", repoID, sha).
+		Cols("state").
+		Update(&CommitStatusSummary{
+			State: state.State,
+		}); err != nil {
+		return err
+	} else if cnt == 0 {
+		_, err = db.GetEngine(ctx).Insert(&CommitStatusSummary{
+			RepoID: repoID,
+			SHA:    sha,
+			State:  state.State,
+		})
+		return err
+	}
+	return nil
+}