draft

backend/internal/service/channel.go

@@ -0,0 +1,140 @@
+package service
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"time"
+
+	"pay-bridge/internal/channel"
+	"pay-bridge/internal/model"
+	"pay-bridge/internal/repository"
+	"pay-bridge/pkg/config"
+	"pay-bridge/pkg/crypto"
+)
+
+const channelCacheTTL = 5 * time.Minute
+
+type cachedChannel struct {
+	ch        channel.PaymentChannel
+	expiresAt time.Time
+}
+
+// ChannelService 渠道服务（负责加载渠道配置并获取渠道实例）
+type ChannelService struct {
+	repo     *repository.ChannelConfigRepository
+	encKey   string
+	urlsCfg  config.ChannelsConfig
+	mu       sync.Mutex
+	cache    map[string]*cachedChannel
+}
+
+func NewChannelService(repo *repository.ChannelConfigRepository, encKey string, urlsCfg config.ChannelsConfig) *ChannelService {
+	return &ChannelService{
+		repo:    repo,
+		encKey:  encKey,
+		urlsCfg: urlsCfg,
+		cache:   make(map[string]*cachedChannel),
+	}
+}
+
+// GetChannel 根据 appID 和渠道码获取渠道适配器实例（5 分钟内存缓存）
+func (s *ChannelService) GetChannel(ctx context.Context, appID, channelCode string) (channel.PaymentChannel, error) {
+	cacheKey := appID + ":" + channelCode
+
+	s.mu.Lock()
+	if entry, ok := s.cache[cacheKey]; ok && time.Now().Before(entry.expiresAt) {
+		ch := entry.ch
+		s.mu.Unlock()
+		return ch, nil
+	}
+	s.mu.Unlock()
+
+	cfg, err := s.repo.GetByAppChannel(ctx, appID, channelCode)
+	if err != nil {
+		return nil, err
+	}
+	if cfg == nil {
+		return nil, fmt.Errorf("channel config not found: app=%s channel=%s", appID, channelCode)
+	}
+
+	decCfg, err := s.decryptConfig(cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	ch, err := channel.Get(channelCode, decCfg, s.urlsFor(channelCode))
+	if err != nil {
+		return nil, err
+	}
+
+	s.mu.Lock()
+	s.cache[cacheKey] = &cachedChannel{ch: ch, expiresAt: time.Now().Add(channelCacheTTL)}
+	s.mu.Unlock()
+
+	return ch, nil
+}
+
+// InvalidateCache 使指定渠道的缓存失效（配置变更时调用）
+func (s *ChannelService) InvalidateCache(appID, channelCode string) {
+	s.mu.Lock()
+	delete(s.cache, appID+":"+channelCode)
+	s.mu.Unlock()
+}
+
+// ListChannelCodes 获取应用下所有渠道码
+func (s *ChannelService) ListChannelCodes(ctx context.Context, appID string) ([]string, error) {
+	cfgs, err := s.repo.ListByApp(ctx, appID)
+	if err != nil {
+		return nil, err
+	}
+	codes := make([]string, 0, len(cfgs))
+	for _, c := range cfgs {
+		codes = append(codes, c.ChannelCode)
+	}
+	return codes, nil
+}
+
+// GetChannelConfig 获取渠道配置（已解密）
+func (s *ChannelService) GetChannelConfig(ctx context.Context, appID, channelCode string) (*model.ChannelConfig, error) {
+	cfg, err := s.repo.GetByAppChannel(ctx, appID, channelCode)
+	if err != nil || cfg == nil {
+		return cfg, err
+	}
+	return s.decryptConfig(cfg)
+}
+
+// urlsFor 根据渠道码返回对应的网关地址配置
+func (s *ChannelService) urlsFor(channelCode string) channel.URLs {
+	switch channelCode {
+	case "HEEPAY":
+		return channel.URLs{
+			PayURL:      s.urlsCfg.Heepay.PayURL,
+			MerchantURL: s.urlsCfg.Heepay.MerchantURL,
+		}
+	default:
+		return channel.URLs{}
+	}
+}
+
+func (s *ChannelService) decryptConfig(cfg *model.ChannelConfig) (*model.ChannelConfig, error) {
+	copied := *cfg
+
+	if cfg.APIKey != "" {
+		dec, err := crypto.Decrypt(cfg.APIKey, s.encKey)
+		if err != nil {
+			return nil, fmt.Errorf("decrypt api_key: %w", err)
+		}
+		copied.APIKey = dec
+	}
+
+	if cfg.PrivateKey != "" {
+		dec, err := crypto.Decrypt(cfg.PrivateKey, s.encKey)
+		if err != nil {
+			return nil, fmt.Errorf("decrypt private_key: %w", err)
+		}
+		copied.PrivateKey = dec
+	}
+
+	return &copied, nil
+}