add: user accomplished

pkg/adapter/redis_cache.go

@@ -0,0 +1,62 @@
+package adapter
+
+import (
+	"bytes"
+	"context"
+	"encoding/gob"
+	"errors"
+	"fmt"
+	"time"
+
+	"ariga.io/entcache"
+	"github.com/redis/go-redis/v9"
+)
+
+type RedisCache struct {
+	redis *redis.ClusterClient
+}
+
+func NewRedisCache(redis *redis.ClusterClient) *RedisCache {
+	return &RedisCache{redis: redis}
+}
+
+func (c *RedisCache) Del(ctx context.Context, key entcache.Key) error {
+	if k, ok := key.(string); !ok {
+		return fmt.Errorf("key is not a string")
+	} else {
+		c.redis.Del(ctx, k)
+		return nil
+	}
+}
+
+func (c *RedisCache) Add(ctx context.Context, key entcache.Key, entry *entcache.Entry, duration time.Duration) error {
+	k, ok := key.(string)
+	if !ok {
+		return fmt.Errorf("key is not a string")
+	}
+	var buf bytes.Buffer
+	if err := gob.NewEncoder(&buf).Encode(entry); err != nil {
+		return fmt.Errorf("failed to encode entry: %w", err)
+	}
+	return c.redis.Set(ctx, k, buf.Bytes(), duration).Err()
+}
+
+func (c *RedisCache) Get(ctx context.Context, key entcache.Key) (*entcache.Entry, error) {
+	k, ok := key.(string)
+	if !ok {
+		return nil, fmt.Errorf("key is not a string")
+	}
+	val, err := c.redis.Get(ctx, k).Bytes()
+	if err != nil {
+		if errors.Is(err, redis.Nil) {
+			// 缓存未命中
+			return nil, nil
+		}
+		return nil, err
+	}
+	var entry entcache.Entry
+	if err := gob.NewDecoder(bytes.NewReader(val)).Decode(&entry); err != nil {
+		return nil, fmt.Errorf("failed to decode entry: %w", err)
+	}
+	return &entry, nil
+}