read from meta cache

meta cache is not initialized

weed/filesys/meta_cache/meta_cache.go

@@ -0,0 +1,34 @@
+package meta_cache
+
+import (
+	"os"
+
+	"github.com/chrislusf/seaweedfs/weed/filer2"
+	"github.com/chrislusf/seaweedfs/weed/filer2/leveldb"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+)
+
+type MetaCache struct {
+	filer2.FilerStore
+}
+
+func NewMetaCache(dbFolder string) *MetaCache {
+	return &MetaCache{
+		FilerStore: OpenMetaStore(dbFolder),
+	}
+}
+
+func OpenMetaStore(dbFolder string) filer2.FilerStore {
+
+	os.MkdirAll(dbFolder, 0755)
+
+	store := &leveldb.LevelDBStore{}
+	config := &cacheConfig{}
+
+	if err := store.Initialize(config, ""); err != nil {
+		glog.Fatalf("Failed to initialize metadata cache store for %s: %+v", store.GetName(), err)
+	}
+
+	return store
+
+}