read from meta cache

meta cache is not initialized

weed/filesys/meta_cache/cache_config.go

@@ -0,0 +1,32 @@
+package meta_cache
+
+import "github.com/chrislusf/seaweedfs/weed/util"
+
+var (
+	_ = util.Configuration(&cacheConfig{})
+)
+
+// implementing util.Configuraion
+type cacheConfig struct {
+	dir string
+}
+
+func (c cacheConfig) GetString(key string) string {
+	return c.dir
+}
+
+func (c cacheConfig) GetBool(key string) bool {
+	panic("implement me")
+}
+
+func (c cacheConfig) GetInt(key string) int {
+	panic("implement me")
+}
+
+func (c cacheConfig) GetStringSlice(key string) []string {
+	panic("implement me")
+}
+
+func (c cacheConfig) SetDefault(key string, value interface{}) {
+	panic("implement me")
+}

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
+
+}