feat: support redis rate limiting

backend/providers/http/limiter_storage_redis.go

@@ -0,0 +1,107 @@
+package http
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"time"
+
+	"github.com/gofiber/fiber/v3"
+	"github.com/redis/go-redis/v9"
+)
+
+type redisLimiterStorage struct {
+	client redis.UniversalClient
+	prefix string
+}
+
+func newRedisLimiterStorage(config *RateLimitRedis) (fiber.Storage, error) {
+	if config == nil {
+		return nil, errors.New("rate limit redis config is nil")
+	}
+	if len(config.Addrs) == 0 {
+		return nil, errors.New("rate limit redis addrs is empty")
+	}
+
+	client := redis.NewUniversalClient(&redis.UniversalOptions{
+		Addrs:    config.Addrs,
+		Username: config.Username,
+		Password: config.Password,
+		DB:       config.DB,
+	})
+
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+	if err := client.Ping(ctx).Err(); err != nil {
+		_ = client.Close()
+		return nil, err
+	}
+
+	prefix := strings.TrimSpace(config.Prefix)
+	return &redisLimiterStorage{
+		client: client,
+		prefix: prefix,
+	}, nil
+}
+
+func (s *redisLimiterStorage) GetWithContext(ctx context.Context, key string) ([]byte, error) {
+	if s == nil || key == "" {
+		return nil, nil
+	}
+	val, err := s.client.Get(ctx, s.key(key)).Bytes()
+	if errors.Is(err, redis.Nil) {
+		return nil, nil
+	}
+	return val, err
+}
+
+func (s *redisLimiterStorage) Get(key string) ([]byte, error) {
+	return s.GetWithContext(context.Background(), key)
+}
+
+func (s *redisLimiterStorage) SetWithContext(ctx context.Context, key string, val []byte, exp time.Duration) error {
+	if s == nil || key == "" || len(val) == 0 {
+		return nil
+	}
+	return s.client.Set(ctx, s.key(key), val, exp).Err()
+}
+
+func (s *redisLimiterStorage) Set(key string, val []byte, exp time.Duration) error {
+	return s.SetWithContext(context.Background(), key, val, exp)
+}
+
+func (s *redisLimiterStorage) DeleteWithContext(ctx context.Context, key string) error {
+	if s == nil || key == "" {
+		return nil
+	}
+	return s.client.Del(ctx, s.key(key)).Err()
+}
+
+func (s *redisLimiterStorage) Delete(key string) error {
+	return s.DeleteWithContext(context.Background(), key)
+}
+
+func (s *redisLimiterStorage) ResetWithContext(ctx context.Context) error {
+	if s == nil {
+		return nil
+	}
+	return s.client.FlushDB(ctx).Err()
+}
+
+func (s *redisLimiterStorage) Reset() error {
+	return s.ResetWithContext(context.Background())
+}
+
+func (s *redisLimiterStorage) Close() error {
+	if s == nil {
+		return nil
+	}
+	return s.client.Close()
+}
+
+func (s *redisLimiterStorage) key(raw string) string {
+	if s.prefix == "" {
+		return raw
+	}
+	return s.prefix + raw
+}