refactor: 删除 ports 目录

backend/internal/service/concurrency_service.go

@@ -7,10 +7,28 @@ import (
 	"fmt"
 	"log"
 	"time"
-
-	"github.com/Wei-Shaw/sub2api/internal/service/ports"
 )
 
+// ConcurrencyCache defines cache operations for concurrency service
+// Uses independent keys per request slot with native Redis TTL for automatic cleanup
+type ConcurrencyCache interface {
+	// Account slot management - each slot is a separate key with independent TTL
+	// Key format: concurrency:account:{accountID}:{requestID}
+	AcquireAccountSlot(ctx context.Context, accountID int64, maxConcurrency int, requestID string) (bool, error)
+	ReleaseAccountSlot(ctx context.Context, accountID int64, requestID string) error
+	GetAccountConcurrency(ctx context.Context, accountID int64) (int, error)
+
+	// User slot management - each slot is a separate key with independent TTL
+	// Key format: concurrency:user:{userID}:{requestID}
+	AcquireUserSlot(ctx context.Context, userID int64, maxConcurrency int, requestID string) (bool, error)
+	ReleaseUserSlot(ctx context.Context, userID int64, requestID string) error
+	GetUserConcurrency(ctx context.Context, userID int64) (int, error)
+
+	// Wait queue - uses counter with TTL set only on creation
+	IncrementWaitCount(ctx context.Context, userID int64, maxWait int) (bool, error)
+	DecrementWaitCount(ctx context.Context, userID int64) error
+}
+
 // generateRequestID generates a unique request ID for concurrency slot tracking
 // Uses 8 random bytes (16 hex chars) for uniqueness
 func generateRequestID() string {
@@ -29,11 +47,11 @@ const (
 
 // ConcurrencyService manages concurrent request limiting for accounts and users
 type ConcurrencyService struct {
-	cache ports.ConcurrencyCache
+	cache ConcurrencyCache
 }
 
 // NewConcurrencyService creates a new ConcurrencyService
-func NewConcurrencyService(cache ports.ConcurrencyCache) *ConcurrencyService {
+func NewConcurrencyService(cache ConcurrencyCache) *ConcurrencyService {
 	return &ConcurrencyService{cache: cache}
 }