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// Copyright 2021 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 user
import (
"context"
"fmt"
"strings"
"code.gitea.io/gitea/models/db"
"xorm.io/builder"
)
// Setting is a key value store of user settings
type Setting struct {
ID int64 `xorm:"pk autoincr"`
UserID int64 `xorm:"index unique(key_userid)"` // to load all of someone's settings
SettingKey string `xorm:"varchar(255) index unique(key_userid)"` // ensure key is always lowercase
SettingValue string `xorm:"text"`
}
// TableName sets the table name for the settings struct
func (s *Setting) TableName() string {
return "user_setting"
}
func init() {
db.RegisterModel(new(Setting))
}
// GetSettings returns specific settings from user
func GetSettings(uid int64, keys []string) (map[string]*Setting, error) {
settings := make([]*Setting, 0, len(keys))
if err := db.GetEngine(db.DefaultContext).
Where("user_id=?", uid).
And(builder.In("setting_key", keys)).
Find(&settings); err != nil {
return nil, err
}
settingsMap := make(map[string]*Setting)
for _, s := range settings {
settingsMap[s.SettingKey] = s
}
return settingsMap, nil
}
// GetUserAllSettings returns all settings from user
func GetUserAllSettings(uid int64) (map[string]*Setting, error) {
settings := make([]*Setting, 0, 5)
if err := db.GetEngine(db.DefaultContext).
Where("user_id=?", uid).
Find(&settings); err != nil {
return nil, err
}
settingsMap := make(map[string]*Setting)
for _, s := range settings {
settingsMap[s.SettingKey] = s
}
return settingsMap, nil
}
// DeleteSetting deletes a specific setting for a user
func DeleteSetting(setting *Setting) error {
_, err := db.GetEngine(db.DefaultContext).Delete(setting)
return err
}
// SetSetting updates a users' setting for a specific key
func SetSetting(setting *Setting) error {
if strings.ToLower(setting.SettingKey) != setting.SettingKey {
return fmt.Errorf("setting key should be lowercase")
}
return upsertSettingValue(setting.UserID, setting.SettingKey, setting.SettingValue)
}
func upsertSettingValue(userID int64, key, value string) error {
return db.WithTx(func(ctx context.Context) error {
e := db.GetEngine(ctx)
// here we use a general method to do a safe upsert for different databases (and most transaction levels)
// 1. try to UPDATE the record and acquire the transaction write lock
// if UPDATE returns non-zero rows are changed, OK, the setting is saved correctly
// if UPDATE returns "0 rows changed", two possibilities: (a) record doesn't exist (b) value is not changed
// 2. do a SELECT to check if the row exists or not (we already have the transaction lock)
// 3. if the row doesn't exist, do an INSERT (we are still protected by the transaction lock, so it's safe)
//
// to optimize the SELECT in step 2, we can use an extra column like `revision=revision+1`
// to make sure the UPDATE always returns a non-zero value for existing (unchanged) records.
res, err := e.Exec("UPDATE user_setting SET setting_value=? WHERE setting_key=? AND user_id=?", value, key, userID)
if err != nil {
return err
}
rows, _ := res.RowsAffected()
if rows > 0 {
// the existing row is updated, so we can return
return nil
}
// in case the value isn't changed, update would return 0 rows changed, so we need this check
has, err := e.Exist(&Setting{UserID: userID, SettingKey: key})
if err != nil {
return err
}
if has {
return nil
}
// if no existing row, insert a new row
_, err = e.Insert(&Setting{UserID: userID, SettingKey: key, SettingValue: value})
return err
})
}
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