386 lines
8.7 KiB
Go
386 lines
8.7 KiB
Go
package cache
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import (
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"context"
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"encoding/json"
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"fmt"
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"strings"
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"time"
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"github.com/redis/go-redis/v9"
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"go.uber.org/zap"
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"tyapi-server/internal/shared/interfaces"
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)
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// RedisCache Redis缓存实现
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type RedisCache struct {
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client *redis.Client
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logger *zap.Logger
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prefix string
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// 统计信息
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hits int64
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misses int64
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}
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// NewRedisCache 创建Redis缓存实例
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func NewRedisCache(client *redis.Client, logger *zap.Logger, prefix string) *RedisCache {
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return &RedisCache{
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client: client,
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logger: logger,
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prefix: prefix,
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}
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}
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// Name 返回服务名称
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func (r *RedisCache) Name() string {
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return "redis-cache"
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}
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// Initialize 初始化服务
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func (r *RedisCache) Initialize(ctx context.Context) error {
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// 测试连接
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_, err := r.client.Ping(ctx).Result()
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if err != nil {
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r.logger.Error("Failed to connect to Redis", zap.Error(err))
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return fmt.Errorf("redis connection failed: %w", err)
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}
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r.logger.Info("Redis cache service initialized")
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return nil
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}
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// HealthCheck 健康检查
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func (r *RedisCache) HealthCheck(ctx context.Context) error {
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_, err := r.client.Ping(ctx).Result()
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return err
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}
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// Shutdown 关闭服务
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func (r *RedisCache) Shutdown(ctx context.Context) error {
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return r.client.Close()
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}
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// Get 获取缓存值
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func (r *RedisCache) Get(ctx context.Context, key string, dest interface{}) error {
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fullKey := r.getFullKey(key)
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val, err := r.client.Get(ctx, fullKey).Result()
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if err != nil {
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if err == redis.Nil {
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r.misses++
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return fmt.Errorf("cache miss: key %s not found", key)
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}
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r.logger.Error("Failed to get cache", zap.String("key", key), zap.Error(err))
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return err
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}
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r.hits++
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return json.Unmarshal([]byte(val), dest)
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}
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// Set 设置缓存值
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func (r *RedisCache) Set(ctx context.Context, key string, value interface{}, ttl ...interface{}) error {
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fullKey := r.getFullKey(key)
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data, err := json.Marshal(value)
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if err != nil {
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r.logger.Error("序列化缓存数据失败", zap.String("key", key), zap.Error(err))
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return fmt.Errorf("failed to marshal value: %w", err)
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}
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var expiration time.Duration
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if len(ttl) > 0 {
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switch v := ttl[0].(type) {
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case time.Duration:
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expiration = v
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case int:
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expiration = time.Duration(v) * time.Second
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case string:
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expiration, _ = time.ParseDuration(v)
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default:
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expiration = 24 * time.Hour // 默认24小时
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}
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} else {
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expiration = 24 * time.Hour // 默认24小时
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}
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err = r.client.Set(ctx, fullKey, data, expiration).Err()
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if err != nil {
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r.logger.Error("设置缓存失败", zap.String("key", key), zap.Error(err))
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return err
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}
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r.logger.Debug("设置缓存成功", zap.String("key", key), zap.Duration("ttl", expiration))
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return nil
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}
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// Delete 删除缓存
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func (r *RedisCache) Delete(ctx context.Context, keys ...string) error {
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if len(keys) == 0 {
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return nil
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}
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fullKeys := make([]string, len(keys))
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for i, key := range keys {
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fullKeys[i] = r.getFullKey(key)
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}
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err := r.client.Del(ctx, fullKeys...).Err()
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if err != nil {
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r.logger.Error("Failed to delete cache", zap.Strings("keys", keys), zap.Error(err))
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return err
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}
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return nil
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}
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// Exists 检查键是否存在
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func (r *RedisCache) Exists(ctx context.Context, key string) (bool, error) {
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fullKey := r.getFullKey(key)
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count, err := r.client.Exists(ctx, fullKey).Result()
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if err != nil {
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return false, err
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}
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return count > 0, nil
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}
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// GetMultiple 批量获取
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func (r *RedisCache) GetMultiple(ctx context.Context, keys []string) (map[string]interface{}, error) {
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if len(keys) == 0 {
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return make(map[string]interface{}), nil
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}
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fullKeys := make([]string, len(keys))
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for i, key := range keys {
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fullKeys[i] = r.getFullKey(key)
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}
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values, err := r.client.MGet(ctx, fullKeys...).Result()
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if err != nil {
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r.logger.Error("批量获取缓存失败", zap.Strings("keys", keys), zap.Error(err))
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return nil, err
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}
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result := make(map[string]interface{})
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for i, val := range values {
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if val != nil {
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var data interface{}
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// 修复：改进JSON反序列化错误处理
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if err := json.Unmarshal([]byte(val.(string)), &data); err != nil {
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r.logger.Warn("反序列化缓存数据失败",
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zap.String("key", keys[i]),
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zap.String("value", val.(string)),
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zap.Error(err))
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continue
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}
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result[keys[i]] = data
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}
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}
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return result, nil
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}
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// SetMultiple 批量设置
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func (r *RedisCache) SetMultiple(ctx context.Context, data map[string]interface{}, ttl ...interface{}) error {
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if len(data) == 0 {
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return nil
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}
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var expiration time.Duration
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if len(ttl) > 0 {
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switch v := ttl[0].(type) {
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case time.Duration:
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expiration = v
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case int:
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expiration = time.Duration(v) * time.Second
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default:
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expiration = 24 * time.Hour
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}
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} else {
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expiration = 24 * time.Hour
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}
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pipe := r.client.Pipeline()
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for key, value := range data {
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fullKey := r.getFullKey(key)
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jsonData, err := json.Marshal(value)
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if err != nil {
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continue
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}
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pipe.Set(ctx, fullKey, jsonData, expiration)
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}
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_, err := pipe.Exec(ctx)
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return err
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}
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// DeletePattern 按模式删除
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func (r *RedisCache) DeletePattern(ctx context.Context, pattern string) error {
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// 修复：避免重复添加前缀
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var fullPattern string
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if strings.HasPrefix(pattern, r.prefix+":") {
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fullPattern = pattern
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} else {
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fullPattern = r.getFullKey(pattern)
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}
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// 检查上下文是否已取消
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if ctx.Err() != nil {
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return ctx.Err()
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}
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var cursor uint64
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var totalDeleted int64
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maxIterations := 100 // 防止无限循环
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iteration := 0
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for {
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// 检查迭代次数限制
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iteration++
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if iteration > maxIterations {
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r.logger.Warn("缓存删除操作达到最大迭代次数限制",
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zap.String("pattern", fullPattern),
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zap.Int("max_iterations", maxIterations),
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zap.Int64("total_deleted", totalDeleted),
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)
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break
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}
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// 检查上下文是否已取消
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if ctx.Err() != nil {
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r.logger.Warn("缓存删除操作被取消",
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zap.String("pattern", fullPattern),
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zap.Int64("total_deleted", totalDeleted),
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zap.Error(ctx.Err()),
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)
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return ctx.Err()
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}
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// 执行SCAN操作
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keys, next, err := r.client.Scan(ctx, cursor, fullPattern, 1000).Result()
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if err != nil {
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// 如果是上下文取消错误，直接返回
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if err == context.Canceled || err == context.DeadlineExceeded {
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r.logger.Warn("缓存删除操作被取消",
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zap.String("pattern", fullPattern),
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zap.Int64("total_deleted", totalDeleted),
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zap.Error(err),
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)
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return err
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}
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r.logger.Error("扫描缓存键失败",
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zap.String("pattern", fullPattern),
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zap.Error(err))
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return err
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}
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// 批量删除找到的键
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if len(keys) > 0 {
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// 使用pipeline批量删除，提高性能
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pipe := r.client.Pipeline()
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pipe.Del(ctx, keys...)
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cmds, err := pipe.Exec(ctx)
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if err != nil {
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r.logger.Error("批量删除缓存键失败",
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zap.Strings("keys", keys),
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zap.Error(err))
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return err
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}
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// 统计删除的键数量
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for _, cmd := range cmds {
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if delCmd, ok := cmd.(*redis.IntCmd); ok {
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if deleted, err := delCmd.Result(); err == nil {
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totalDeleted += deleted
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}
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}
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}
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r.logger.Debug("批量删除缓存键",
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zap.Strings("keys", keys),
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zap.Int("batch_size", len(keys)),
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zap.Int64("total_deleted", totalDeleted),
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)
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}
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cursor = next
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if cursor == 0 {
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break
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}
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}
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r.logger.Debug("缓存模式删除完成",
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zap.String("pattern", fullPattern),
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zap.Int64("total_deleted", totalDeleted),
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zap.Int("iterations", iteration),
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)
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return nil
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}
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// Keys 获取匹配的键
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func (r *RedisCache) Keys(ctx context.Context, pattern string) ([]string, error) {
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fullPattern := r.getFullKey(pattern)
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keys, err := r.client.Keys(ctx, fullPattern).Result()
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if err != nil {
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return nil, err
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}
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// 移除前缀
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result := make([]string, len(keys))
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prefixLen := len(r.prefix) + 1 // +1 for ":"
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for i, key := range keys {
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if len(key) > prefixLen {
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result[i] = key[prefixLen:]
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} else {
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result[i] = key
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}
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}
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return result, nil
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}
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// Stats 获取缓存统计
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func (r *RedisCache) Stats(ctx context.Context) (interfaces.CacheStats, error) {
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dbSize, _ := r.client.DBSize(ctx).Result()
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return interfaces.CacheStats{
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Hits: r.hits,
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Misses: r.misses,
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Keys: dbSize,
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Memory: 0, // 暂时设为0，后续可解析Redis info
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Connections: 0, // 暂时设为0，后续可解析Redis info
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}, nil
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}
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// getFullKey 获取完整键名
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func (r *RedisCache) getFullKey(key string) string {
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if r.prefix == "" {
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return key
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}
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return fmt.Sprintf("%s:%s", r.prefix, key)
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}
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// Flush 清空所有缓存
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func (r *RedisCache) Flush(ctx context.Context) error {
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if r.prefix == "" {
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return r.client.FlushDB(ctx).Err()
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}
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// 只删除带前缀的键
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return r.DeletePattern(ctx, "*")
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}
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// GetClient 获取原始Redis客户端
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func (r *RedisCache) GetClient() *redis.Client {
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return r.client
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}
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