复制项目

pkg/common/storage/cache/mcache/tools.go

@@ -0,0 +1,63 @@
+package mcache
+
+import (
+	"context"
+	"encoding/json"
+	"time"
+
+	"git.imall.cloud/openim/open-im-server-deploy/pkg/common/storage/database"
+	"github.com/openimsdk/tools/log"
+)
+
+func getCache[V any](ctx context.Context, cache database.Cache, key string, expireTime time.Duration, fn func(ctx context.Context) (V, error)) (V, error) {
+	getDB := func() (V, bool, error) {
+		res, err := cache.Get(ctx, []string{key})
+		if err != nil {
+			var val V
+			return val, false, err
+		}
+		var val V
+		if str, ok := res[key]; ok {
+			if json.Unmarshal([]byte(str), &val) != nil {
+				return val, false, err
+			}
+			return val, true, nil
+		}
+		return val, false, nil
+	}
+	dbVal, ok, err := getDB()
+	if err != nil {
+		return dbVal, err
+	}
+	if ok {
+		return dbVal, nil
+	}
+	lockValue, err := cache.Lock(ctx, key, time.Minute)
+	if err != nil {
+		return dbVal, err
+	}
+	defer func() {
+		if err := cache.Unlock(ctx, key, lockValue); err != nil {
+			log.ZError(ctx, "unlock cache key", err, "key", key, "value", lockValue)
+		}
+	}()
+	dbVal, ok, err = getDB()
+	if err != nil {
+		return dbVal, err
+	}
+	if ok {
+		return dbVal, nil
+	}
+	val, err := fn(ctx)
+	if err != nil {
+		return val, err
+	}
+	data, err := json.Marshal(val)
+	if err != nil {
+		return val, err
+	}
+	if err := cache.Set(ctx, key, string(data), expireTime); err != nil {
+		return val, err
+	}
+	return val, nil
+}