无订阅 支付后出现两个订阅

pkg/signature/nonce_store.go

@@ -0,0 +1,30 @@
+package signature
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+)
+
+type NonceStore interface {
+	SetIfNotExists(ctx context.Context, appId, nonce string, ttlSeconds int64) (bool, error)
+}
+
+type RedisNonceStore struct {
+	client *redis.Client
+}
+
+func NewRedisNonceStore(client *redis.Client) *RedisNonceStore {
+	return &RedisNonceStore{client: client}
+}
+
+func (s *RedisNonceStore) SetIfNotExists(ctx context.Context, appId, nonce string, ttlSeconds int64) (bool, error) {
+	key := fmt.Sprintf("sig:nonce:%s:%s", appId, nonce)
+	ok, err := s.client.SetNX(ctx, key, "1", time.Duration(ttlSeconds)*time.Second).Result()
+	if err != nil {
+		return false, err
+	}
+	return !ok, nil
+}