a correct implementation of filer

go/filer/filer.go

@@ -0,0 +1,19 @@
+package filer
+
+import ()
+
+type FileId string //file id on weedfs
+
+type FileEntry struct {
+	Name string //file name without path
+	Id   FileId
+}
+
+type Filer interface {
+	CreateFile(filePath string, fid string) (err error)
+	FindFile(filePath string) (fid string, err error)
+	ListDirectories(dirPath string) (dirs []DirectoryEntry, err error)
+	ListFiles(dirPath string, lastFileName string, limit int) (files []FileEntry, err error)
+	DeleteDirectory(dirPath string) (err error)
+	DeleteFile(filePath string) (fid string, err error)
+}