315 lines
9.5 KiB
Go
315 lines
9.5 KiB
Go
package service
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import (
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"context"
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"errors"
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"fmt"
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"log"
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"time"
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"github.com/Wei-Shaw/sub2api/internal/model"
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"github.com/Wei-Shaw/sub2api/internal/service/ports"
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)
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// 错误定义
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// 注：ErrInsufficientBalance在redeem_service.go中定义
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// 注：ErrDailyLimitExceeded/ErrWeeklyLimitExceeded/ErrMonthlyLimitExceeded在subscription_service.go中定义
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var (
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ErrSubscriptionInvalid = errors.New("subscription is invalid or expired")
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)
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// subscriptionCacheData 订阅缓存数据结构（内部使用）
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type subscriptionCacheData struct {
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Status string
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ExpiresAt time.Time
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DailyUsage float64
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WeeklyUsage float64
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MonthlyUsage float64
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Version int64
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}
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// BillingCacheService 计费缓存服务
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// 负责余额和订阅数据的缓存管理，提供高性能的计费资格检查
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type BillingCacheService struct {
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cache ports.BillingCache
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userRepo ports.UserRepository
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subRepo ports.UserSubscriptionRepository
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}
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// NewBillingCacheService 创建计费缓存服务
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func NewBillingCacheService(cache ports.BillingCache, userRepo ports.UserRepository, subRepo ports.UserSubscriptionRepository) *BillingCacheService {
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return &BillingCacheService{
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cache: cache,
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userRepo: userRepo,
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subRepo: subRepo,
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}
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}
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// ============================================
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// 余额缓存方法
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// ============================================
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// GetUserBalance 获取用户余额（优先从缓存读取）
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func (s *BillingCacheService) GetUserBalance(ctx context.Context, userID int64) (float64, error) {
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if s.cache == nil {
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// Redis不可用，直接查询数据库
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return s.getUserBalanceFromDB(ctx, userID)
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}
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// 尝试从缓存读取
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balance, err := s.cache.GetUserBalance(ctx, userID)
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if err == nil {
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return balance, nil
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}
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// 缓存未命中，从数据库读取
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balance, err = s.getUserBalanceFromDB(ctx, userID)
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if err != nil {
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return 0, err
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}
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// 异步建立缓存
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go func() {
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cacheCtx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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s.setBalanceCache(cacheCtx, userID, balance)
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}()
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return balance, nil
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}
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// getUserBalanceFromDB 从数据库获取用户余额
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func (s *BillingCacheService) getUserBalanceFromDB(ctx context.Context, userID int64) (float64, error) {
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user, err := s.userRepo.GetByID(ctx, userID)
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if err != nil {
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return 0, fmt.Errorf("get user balance: %w", err)
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}
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return user.Balance, nil
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}
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// setBalanceCache 设置余额缓存
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func (s *BillingCacheService) setBalanceCache(ctx context.Context, userID int64, balance float64) {
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if s.cache == nil {
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return
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}
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if err := s.cache.SetUserBalance(ctx, userID, balance); err != nil {
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log.Printf("Warning: set balance cache failed for user %d: %v", userID, err)
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}
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}
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// DeductBalanceCache 扣减余额缓存（异步调用，用于扣费后更新缓存）
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func (s *BillingCacheService) DeductBalanceCache(ctx context.Context, userID int64, amount float64) error {
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if s.cache == nil {
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return nil
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}
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return s.cache.DeductUserBalance(ctx, userID, amount)
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}
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// InvalidateUserBalance 失效用户余额缓存
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func (s *BillingCacheService) InvalidateUserBalance(ctx context.Context, userID int64) error {
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if s.cache == nil {
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return nil
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}
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if err := s.cache.InvalidateUserBalance(ctx, userID); err != nil {
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log.Printf("Warning: invalidate balance cache failed for user %d: %v", userID, err)
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return err
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}
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return nil
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}
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// ============================================
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// 订阅缓存方法
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// ============================================
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// GetSubscriptionStatus 获取订阅状态（优先从缓存读取）
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func (s *BillingCacheService) GetSubscriptionStatus(ctx context.Context, userID, groupID int64) (*subscriptionCacheData, error) {
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if s.cache == nil {
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return s.getSubscriptionFromDB(ctx, userID, groupID)
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}
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// 尝试从缓存读取
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cacheData, err := s.cache.GetSubscriptionCache(ctx, userID, groupID)
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if err == nil && cacheData != nil {
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return s.convertFromPortsData(cacheData), nil
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}
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// 缓存未命中，从数据库读取
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data, err := s.getSubscriptionFromDB(ctx, userID, groupID)
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if err != nil {
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return nil, err
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}
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// 异步建立缓存
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go func() {
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cacheCtx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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s.setSubscriptionCache(cacheCtx, userID, groupID, data)
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}()
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return data, nil
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}
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func (s *BillingCacheService) convertFromPortsData(data *ports.SubscriptionCacheData) *subscriptionCacheData {
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return &subscriptionCacheData{
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Status: data.Status,
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ExpiresAt: data.ExpiresAt,
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DailyUsage: data.DailyUsage,
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WeeklyUsage: data.WeeklyUsage,
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MonthlyUsage: data.MonthlyUsage,
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Version: data.Version,
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}
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}
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func (s *BillingCacheService) convertToPortsData(data *subscriptionCacheData) *ports.SubscriptionCacheData {
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return &ports.SubscriptionCacheData{
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Status: data.Status,
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ExpiresAt: data.ExpiresAt,
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DailyUsage: data.DailyUsage,
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WeeklyUsage: data.WeeklyUsage,
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MonthlyUsage: data.MonthlyUsage,
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Version: data.Version,
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}
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}
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// getSubscriptionFromDB 从数据库获取订阅数据
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func (s *BillingCacheService) getSubscriptionFromDB(ctx context.Context, userID, groupID int64) (*subscriptionCacheData, error) {
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sub, err := s.subRepo.GetActiveByUserIDAndGroupID(ctx, userID, groupID)
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if err != nil {
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return nil, fmt.Errorf("get subscription: %w", err)
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}
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return &subscriptionCacheData{
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Status: sub.Status,
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ExpiresAt: sub.ExpiresAt,
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DailyUsage: sub.DailyUsageUSD,
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WeeklyUsage: sub.WeeklyUsageUSD,
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MonthlyUsage: sub.MonthlyUsageUSD,
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Version: sub.UpdatedAt.Unix(),
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}, nil
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}
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// setSubscriptionCache 设置订阅缓存
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func (s *BillingCacheService) setSubscriptionCache(ctx context.Context, userID, groupID int64, data *subscriptionCacheData) {
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if s.cache == nil || data == nil {
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return
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}
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if err := s.cache.SetSubscriptionCache(ctx, userID, groupID, s.convertToPortsData(data)); err != nil {
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log.Printf("Warning: set subscription cache failed for user %d group %d: %v", userID, groupID, err)
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}
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}
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// UpdateSubscriptionUsage 更新订阅用量缓存（异步调用，用于扣费后更新缓存）
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func (s *BillingCacheService) UpdateSubscriptionUsage(ctx context.Context, userID, groupID int64, costUSD float64) error {
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if s.cache == nil {
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return nil
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}
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return s.cache.UpdateSubscriptionUsage(ctx, userID, groupID, costUSD)
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}
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// InvalidateSubscription 失效指定订阅缓存
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func (s *BillingCacheService) InvalidateSubscription(ctx context.Context, userID, groupID int64) error {
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if s.cache == nil {
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return nil
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}
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if err := s.cache.InvalidateSubscriptionCache(ctx, userID, groupID); err != nil {
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log.Printf("Warning: invalidate subscription cache failed for user %d group %d: %v", userID, groupID, err)
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return err
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}
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return nil
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}
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// ============================================
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// 统一检查方法
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// ============================================
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// CheckBillingEligibility 检查用户是否有资格发起请求
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// 余额模式：检查缓存余额 > 0
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// 订阅模式：检查缓存用量未超过限额（Group限额从参数传入）
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func (s *BillingCacheService) CheckBillingEligibility(ctx context.Context, user *model.User, apiKey *model.ApiKey, group *model.Group, subscription *model.UserSubscription) error {
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// 判断计费模式
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isSubscriptionMode := group != nil && group.IsSubscriptionType() && subscription != nil
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if isSubscriptionMode {
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return s.checkSubscriptionEligibility(ctx, user.ID, group, subscription)
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}
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return s.checkBalanceEligibility(ctx, user.ID)
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}
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// checkBalanceEligibility 检查余额模式资格
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func (s *BillingCacheService) checkBalanceEligibility(ctx context.Context, userID int64) error {
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balance, err := s.GetUserBalance(ctx, userID)
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if err != nil {
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// 缓存/数据库错误，允许通过（降级处理）
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log.Printf("Warning: get user balance failed, allowing request: %v", err)
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return nil
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}
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if balance <= 0 {
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return ErrInsufficientBalance
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}
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return nil
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}
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// checkSubscriptionEligibility 检查订阅模式资格
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func (s *BillingCacheService) checkSubscriptionEligibility(ctx context.Context, userID int64, group *model.Group, subscription *model.UserSubscription) error {
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// 获取订阅缓存数据
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subData, err := s.GetSubscriptionStatus(ctx, userID, group.ID)
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if err != nil {
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// 缓存/数据库错误，降级使用传入的subscription进行检查
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log.Printf("Warning: get subscription cache failed, using fallback: %v", err)
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return s.checkSubscriptionLimitsFallback(subscription, group)
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}
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// 检查订阅状态
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if subData.Status != model.SubscriptionStatusActive {
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return ErrSubscriptionInvalid
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}
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// 检查是否过期
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if time.Now().After(subData.ExpiresAt) {
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return ErrSubscriptionInvalid
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}
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// 检查限额（使用传入的Group限额配置）
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if group.HasDailyLimit() && subData.DailyUsage >= *group.DailyLimitUSD {
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return ErrDailyLimitExceeded
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}
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if group.HasWeeklyLimit() && subData.WeeklyUsage >= *group.WeeklyLimitUSD {
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return ErrWeeklyLimitExceeded
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}
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if group.HasMonthlyLimit() && subData.MonthlyUsage >= *group.MonthlyLimitUSD {
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return ErrMonthlyLimitExceeded
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}
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return nil
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}
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// checkSubscriptionLimitsFallback 降级检查订阅限额
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func (s *BillingCacheService) checkSubscriptionLimitsFallback(subscription *model.UserSubscription, group *model.Group) error {
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if subscription == nil {
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return ErrSubscriptionInvalid
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}
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if !subscription.IsActive() {
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return ErrSubscriptionInvalid
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}
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if !subscription.CheckDailyLimit(group, 0) {
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return ErrDailyLimitExceeded
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}
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if !subscription.CheckWeeklyLimit(group, 0) {
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return ErrWeeklyLimitExceeded
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}
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if !subscription.CheckMonthlyLimit(group, 0) {
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return ErrMonthlyLimitExceeded
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}
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return nil
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}
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