Add system setting table with cache and also add cache supports for user setting (#18058)

models/migrations/v227.go

@@ -0,0 +1,64 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package migrations
+
+import (
+	"fmt"
+	"strconv"
+
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"xorm.io/xorm"
+)
+
+type SystemSetting struct {
+	ID           int64              `xorm:"pk autoincr"`
+	SettingKey   string             `xorm:"varchar(255) unique"` // ensure key is always lowercase
+	SettingValue string             `xorm:"text"`
+	Version      int                `xorm:"version"` // prevent to override
+	Created      timeutil.TimeStamp `xorm:"created"`
+	Updated      timeutil.TimeStamp `xorm:"updated"`
+}
+
+func insertSettingsIfNotExist(x *xorm.Engine, sysSettings []*SystemSetting) error {
+	sess := x.NewSession()
+	defer sess.Close()
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+	for _, setting := range sysSettings {
+		exist, err := sess.Table("system_setting").Where("setting_key=?", setting.SettingKey).Exist()
+		if err != nil {
+			return err
+		}
+		if !exist {
+			if _, err := sess.Insert(setting); err != nil {
+				return err
+			}
+		}
+	}
+	return sess.Commit()
+}
+
+func createSystemSettingsTable(x *xorm.Engine) error {
+	if err := x.Sync2(new(SystemSetting)); err != nil {
+		return fmt.Errorf("sync2: %v", err)
+	}
+
+	// migrate xx to database
+	sysSettings := []*SystemSetting{
+		{
+			SettingKey:   "picture.disable_gravatar",
+			SettingValue: strconv.FormatBool(setting.DisableGravatar),
+		},
+		{
+			SettingKey:   "picture.enable_federated_avatar",
+			SettingValue: strconv.FormatBool(setting.EnableFederatedAvatar),
+		},
+	}
+
+	return insertSettingsIfNotExist(x, sysSettings)
+}