app-api/internal/cache/brand_cache.go

package cache

import (
	"context"
	"encoding/json"
	"fmt"
	"time"

	"github.com/luxsin/app-api/internal/model"
	"github.com/redis/go-redis/v9"
)

const (
	brandAllKey = "brand:all"
	brandTTL    = 30 * time.Minute
)

type BrandCache struct {
	rdb *redis.Client
}

func NewBrandCache(rdb *redis.Client) *BrandCache {
	return &BrandCache{rdb: rdb}
}

func (c *BrandCache) Exists(ctx context.Context) (bool, error) {
	n, err := c.rdb.Exists(ctx, brandAllKey).Result()
	if err != nil {
		return false, err
	}
	return n > 0, nil
}

func (c *BrandCache) GetAll(ctx context.Context) ([]model.Brand, error) {
	data, err := c.rdb.Get(ctx, brandAllKey).Bytes()
	if err != nil {
		return nil, err
	}
	var list []model.Brand
	if err := json.Unmarshal(data, &list); err != nil {
		return nil, fmt.Errorf("unmarshal brands: %w", err)
	}
	return list, nil
}

func (c *BrandCache) SetAll(ctx context.Context, list []model.Brand) error {
	data, err := json.Marshal(list)
	if err != nil {
		return fmt.Errorf("marshal brands: %w", err)
	}
	return c.rdb.Set(ctx, brandAllKey, data, brandTTL).Err()
}