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