Add support for distributed filer metadata store.

go/filer/flat_namespace/flat_namespace_filer.go

@@ -0,0 +1,50 @@
+package flat_namespace
+
+import (
+	"errors"
+
+	"github.com/chrislusf/weed-fs/go/filer"
+)
+
+type FlatNamesapceFiler struct {
+	master string
+	store  FlatNamespaceStore
+}
+
+var (
+	NotImplemented = errors.New("Not Implemented for flat namespace meta data store!")
+)
+
+func NewFlatNamesapceFiler(master string, store FlatNamespaceStore) *FlatNamesapceFiler {
+	return &FlatNamesapceFiler{
+		master: master,
+		store:  store,
+	}
+}
+
+func (filer *FlatNamesapceFiler) CreateFile(fullFileName string, fid string) (err error) {
+	return filer.store.Put(fullFileName, fid)
+}
+func (filer *FlatNamesapceFiler) FindFile(fullFileName string) (fid string, err error) {
+	return filer.store.Get(fullFileName)
+}
+func (filer *FlatNamesapceFiler) FindDirectory(dirPath string) (dirId filer.DirectoryId, err error) {
+	return 0, NotImplemented
+}
+func (filer *FlatNamesapceFiler) ListDirectories(dirPath string) (dirs []filer.DirectoryEntry, err error) {
+	return nil, NotImplemented
+}
+func (filer *FlatNamesapceFiler) ListFiles(dirPath string, lastFileName string, limit int) (files []filer.FileEntry, err error) {
+	return nil, NotImplemented
+}
+func (filer *FlatNamesapceFiler) DeleteDirectory(dirPath string, recursive bool) (err error) {
+	return NotImplemented
+}
+
+func (filer *FlatNamesapceFiler) DeleteFile(fullFileName string) (fid string, err error) {
+	return filer.store.Delete(fullFileName)
+}
+
+func (filer *FlatNamesapceFiler) Move(fromPath string, toPath string) error {
+	return NotImplemented
+}