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240
internal/settings/settings.go
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240
internal/settings/settings.go
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// file: gemini-balancer\internal\settings\settings.go
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package settings
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import (
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"encoding/json"
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"fmt"
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"gemini-balancer/internal/models"
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"gemini-balancer/internal/store"
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"gemini-balancer/internal/syncer"
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"reflect"
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"strconv"
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"strings"
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"github.com/sirupsen/logrus"
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"gorm.io/gorm"
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"gorm.io/gorm/clause"
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)
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const SettingsUpdateChannel = "system_settings:updated"
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const DefaultGeminiEndpoint = "https://generativelanguage.googleapis.com/v1beta/models"
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// SettingsManager [核心修正] syncer现在缓存正确的“蓝图”类型
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type SettingsManager struct {
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db *gorm.DB
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syncer *syncer.CacheSyncer[*models.SystemSettings]
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logger *logrus.Entry
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jsonToFieldType map[string]reflect.Type // 用于将JSON字段映射到Go类型
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}
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func NewSettingsManager(db *gorm.DB, store store.Store, logger *logrus.Logger) (*SettingsManager, error) {
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sm := &SettingsManager{
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db: db,
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logger: logger.WithField("component", "SettingsManager⚙️"),
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jsonToFieldType: make(map[string]reflect.Type),
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}
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// settingsLoader 的职责：读取“砖块”，组装并返回“蓝图”
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settingsType := reflect.TypeOf(models.SystemSettings{})
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for i := 0; i < settingsType.NumField(); i++ {
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field := settingsType.Field(i)
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jsonTag := field.Tag.Get("json")
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if jsonTag != "" && jsonTag != "-" {
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sm.jsonToFieldType[jsonTag] = field.Type
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}
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}
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// settingsLoader 的职责：读取“砖块”，智能组装成“蓝图”
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settingsLoader := func() (*models.SystemSettings, error) {
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sm.logger.Info("Loading system settings from database...")
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var dbRecords []models.Setting
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if err := sm.db.Find(&dbRecords).Error; err != nil {
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return nil, fmt.Errorf("failed to load system settings from db: %w", err)
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}
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settingsMap := make(map[string]string)
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for _, record := range dbRecords {
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settingsMap[record.Key] = record.Value
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}
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// 从一个包含了所有“出厂设置”的“蓝图”开始
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settings := defaultSystemSettings()
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v := reflect.ValueOf(settings).Elem()
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t := v.Type()
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// [智能卸货]
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for i := 0; i < t.NumField(); i++ {
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field := t.Field(i)
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fieldValue := v.Field(i)
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jsonTag := field.Tag.Get("json")
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if dbValue, ok := settingsMap[jsonTag]; ok {
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if err := parseAndSetField(fieldValue, dbValue); err != nil {
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sm.logger.Warnf("Failed to set config field '%s' from DB value '%s': %v. Using default.", field.Name, dbValue, err)
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}
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}
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}
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if settings.BaseKeyCheckEndpoint == DefaultGeminiEndpoint || settings.BaseKeyCheckEndpoint == "" {
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if settings.DefaultUpstreamURL != "" {
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// 如果全局上游URL已设置，则基于它构建新的检查端点。
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originalEndpoint := settings.BaseKeyCheckEndpoint
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derivedEndpoint := strings.TrimSuffix(settings.DefaultUpstreamURL, "/") + "/models"
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settings.BaseKeyCheckEndpoint = derivedEndpoint
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sm.logger.Infof(
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"BaseKeyCheckEndpoint is dynamically derived from DefaultUpstreamURL. Original: '%s', New: '%s'",
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originalEndpoint, derivedEndpoint,
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)
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}
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} else {
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sm.logger.Infof("BaseKeyCheckEndpoint is using a user-defined override: %s", settings.BaseKeyCheckEndpoint)
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}
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sm.logger.Info("System settings loaded and cached.")
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sm.DisplaySettings(settings)
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return settings, nil
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}
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s, err := syncer.NewCacheSyncer(settingsLoader, store, SettingsUpdateChannel)
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if err != nil {
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return nil, fmt.Errorf("failed to create system settings syncer: %w", err)
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}
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sm.syncer = s
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go sm.ensureSettingsInitialized()
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return sm, nil
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}
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// GetSettings [核心修正] 现在它正确地返回我们需要的“蓝图”
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func (sm *SettingsManager) GetSettings() *models.SystemSettings {
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return sm.syncer.Get()
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}
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// UpdateSettings [核心修正] 它接收更新，并将它们转换为“砖块”存入数据库
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func (sm *SettingsManager) UpdateSettings(settingsMap map[string]interface{}) error {
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var settingsToUpdate []models.Setting
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for key, value := range settingsMap {
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fieldType, ok := sm.jsonToFieldType[key]
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if !ok {
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sm.logger.Warnf("Received update for unknown setting key '%s', ignoring.", key)
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continue
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}
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var dbValue string
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// [智能打包]
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// 如果字段是 slice 或 map，我们就将传入的 interface{} “打包”成 JSON string
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kind := fieldType.Kind()
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if kind == reflect.Slice || kind == reflect.Map {
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jsonBytes, marshalErr := json.Marshal(value)
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if marshalErr != nil {
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// [真正的错误处理] 如果打包失败，我们记录日志，并跳过这个“坏掉的集装箱”。
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sm.logger.Warnf("Failed to marshal setting '%s' to JSON: %v, skipping update.", key, marshalErr)
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continue // 跳过，继续处理下一个key
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}
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dbValue = string(jsonBytes)
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} else if kind == reflect.Bool {
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if b, ok := value.(bool); ok {
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dbValue = strconv.FormatBool(b)
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} else {
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dbValue = "false"
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}
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} else {
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dbValue = fmt.Sprintf("%v", value)
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}
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settingsToUpdate = append(settingsToUpdate, models.Setting{
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Key: key,
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Value: dbValue,
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})
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}
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if len(settingsToUpdate) > 0 {
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err := sm.db.Clauses(clause.OnConflict{
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Columns: []clause.Column{{Name: "key"}},
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DoUpdates: clause.AssignmentColumns([]string{"value"}),
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}).Create(&settingsToUpdate).Error
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if err != nil {
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return fmt.Errorf("failed to update settings in db: %w", err)
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}
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}
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return sm.syncer.Invalidate()
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}
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// ensureSettingsInitialized [核心修正] 确保DB中有所有“砖块”的定义
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func (sm *SettingsManager) ensureSettingsInitialized() {
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defaults := defaultSystemSettings()
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v := reflect.ValueOf(defaults).Elem()
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t := v.Type()
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for i := 0; i < t.NumField(); i++ {
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field := t.Field(i)
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fieldValue := v.Field(i)
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key := field.Tag.Get("json")
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if key == "" || key == "-" {
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continue
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}
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var existing models.Setting
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if err := sm.db.Where("key = ?", key).First(&existing).Error; err == gorm.ErrRecordNotFound {
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var defaultValue string
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kind := fieldValue.Kind()
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// [智能初始化]
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if kind == reflect.Slice || kind == reflect.Map {
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// 为复杂类型，生成一个“空的”JSON字符串，例如 "[]" 或 "{}"
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jsonBytes, _ := json.Marshal(fieldValue.Interface())
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defaultValue = string(jsonBytes)
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} else {
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defaultValue = field.Tag.Get("default")
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}
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setting := models.Setting{
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Key: key,
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Value: defaultValue,
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Name: field.Tag.Get("name"),
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Description: field.Tag.Get("desc"),
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Category: field.Tag.Get("category"),
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DefaultValue: field.Tag.Get("default"), // 元数据中的default，永远来自tag
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}
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if err := sm.db.Create(&setting).Error; err != nil {
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sm.logger.Errorf("Failed to initialize setting '%s': %v", key, err)
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}
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}
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}
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}
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// ResetAndSaveSettings [核心新增] 將所有配置重置為其在 'default' 標籤中定義的值。
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func (sm *SettingsManager) ResetAndSaveSettings() (*models.SystemSettings, error) {
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defaults := defaultSystemSettings()
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v := reflect.ValueOf(defaults).Elem()
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t := v.Type()
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var settingsToSave []models.Setting
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for i := 0; i < t.NumField(); i++ {
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field := t.Field(i)
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fieldValue := v.Field(i)
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key := field.Tag.Get("json")
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if key == "" || key == "-" {
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continue
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}
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var defaultValue string
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kind := fieldValue.Kind()
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// [智能重置]
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if kind == reflect.Slice || kind == reflect.Map {
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jsonBytes, _ := json.Marshal(fieldValue.Interface())
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defaultValue = string(jsonBytes)
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} else {
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defaultValue = field.Tag.Get("default")
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}
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setting := models.Setting{
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Key: key,
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Value: defaultValue,
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Name: field.Tag.Get("name"),
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Description: field.Tag.Get("desc"),
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Category: field.Tag.Get("category"),
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DefaultValue: field.Tag.Get("default"),
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}
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settingsToSave = append(settingsToSave, setting)
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}
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if len(settingsToSave) > 0 {
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err := sm.db.Clauses(clause.OnConflict{
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Columns: []clause.Column{{Name: "key"}},
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DoUpdates: clause.AssignmentColumns([]string{"value", "name", "description", "category", "default_value"}),
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}).Create(&settingsToSave).Error
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if err != nil {
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return nil, fmt.Errorf("failed to reset settings in db: %w", err)
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}
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}
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if err := sm.syncer.Invalidate(); err != nil {
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sm.logger.Errorf("Failed to invalidate settings cache after reset: %v", err)
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}
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return defaults, nil
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}
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