feat: 实现公共工具包，包括日志、错误处理、数据库和缓存

backend/shared/pkg/cache/redis.go

@@ -0,0 +1,120 @@
+package cache
+
+import (
+	"context"
+	"time"
+
+	"backend/shared/pkg/logger"
+
+	"github.com/go-redis/redis/v8"
+)
+
+type RedisConfig struct {
+	Addr     string
+	Password string
+	DB       int
+}
+
+type RedisCache struct {
+	Client *redis.Client
+	ctx    context.Context
+}
+
+// NewRedisCache 创建新的 Redis 缓存连接
+func NewRedisCache(config RedisConfig) (*RedisCache, error) {
+	client := redis.NewClient(&redis.Options{
+		Addr:     config.Addr,
+		Password: config.Password,
+		DB:       config.DB,
+	})
+
+	ctx := context.Background()
+
+	// 测试连接
+	if _, err := client.Ping(ctx).Result(); err != nil {
+		return nil, err
+	}
+
+	logger.Info("Connected to Redis cache")
+
+	return &RedisCache{
+		Client: client,
+		ctx:    ctx,
+	}, nil
+}
+
+// Close 关闭 Redis 连接
+func (r *RedisCache) Close() error {
+	if r.Client != nil {
+		return r.Client.Close()
+	}
+	return nil
+}
+
+// Set 设置缓存
+func (r *RedisCache) Set(key string, value interface{}, expiration time.Duration) error {
+	return r.Client.Set(r.ctx, key, value, expiration).Err()
+}
+
+// Get 获取缓存
+func (r *RedisCache) Get(key string) (string, error) {
+	return r.Client.Get(r.ctx, key).Result()
+}
+
+// Delete 删除缓存
+func (r *RedisCache) Delete(key string) error {
+	return r.Client.Del(r.ctx, key).Err()
+}
+
+// Exists 检查键是否存在
+func (r *RedisCache) Exists(key string) (bool, error) {
+	result, err := r.Client.Exists(r.ctx, key).Result()
+	if err != nil {
+		return false, err
+	}
+	return result > 0, nil
+}
+
+// Expire 设置键的过期时间
+func (r *RedisCache) Expire(key string, expiration time.Duration) error {
+	return r.Client.Expire(r.ctx, key, expiration).Err()
+}
+
+// TTL 获取键的剩余过期时间
+func (r *RedisCache) TTL(key string) (time.Duration, error) {
+	return r.Client.TTL(r.ctx, key).Result()
+}
+
+// Incr 递增键的值
+func (r *RedisCache) Incr(key string) (int64, error) {
+	return r.Client.Incr(r.ctx, key).Result()
+}
+
+// Decr 递减键的值
+func (r *RedisCache) Decr(key string) (int64, error) {
+	return r.Client.Decr(r.ctx, key).Result()
+}
+
+// HashSet 设置哈希表字段
+func (r *RedisCache) HashSet(key, field string, value interface{}) error {
+	return r.Client.HSet(r.ctx, key, field, value).Err()
+}
+
+// HashGet 获取哈希表字段
+func (r *RedisCache) HashGet(key, field string) (string, error) {
+	return r.Client.HGet(r.ctx, key, field).Result()
+}
+
+// HashDelete 删除哈希表字段
+func (r *RedisCache) HashDelete(key string, fields ...string) error {
+	return r.Client.HDel(r.ctx, key, fields...).Err()
+}
+
+// HashExists 检查哈希表字段是否存在
+func (r *RedisCache) HashExists(key, field string) (bool, error) {
+	result, err := r.Client.HExists(r.ctx, key, field).Result()
+	if err != nil {
+		return false, err
+	}
+	return result, nil
+}