starting filer2

weed/filer2/filer_structure.go

@@ -0,0 +1,62 @@
+package filer2
+
+import (
+	"errors"
+	"os"
+	"time"
+)
+
+type FileId string //file id in SeaweedFS
+type FullPath struct {
+	Dir  string //full path of the parent dir
+	Name string //file name without path
+}
+
+type Attr struct {
+	Mtime       time.Time   // time of last modification
+	Crtime      time.Time   // time of creation (OS X only)
+	Mode        os.FileMode // file mode
+	Uid         uint32      // owner uid
+	Gid         uint32      // group gid
+	IsDirectory bool
+	Size        uint64 // total size in bytes
+	Nlink       uint32 // number of links (usually 1)
+}
+
+type Entry struct {
+	Dir  string `json:"dir,omitempty"`  //full path of the parent dir
+	Name string `json:"name,omitempty"` //file name without path
+
+	Attr
+
+	// the following is for files
+	Chunks []FileChunk `json:"chunks,omitempty"`
+}
+
+type FileChunk struct {
+	Fid    FileId `json:"fid,omitempty"`
+	Offset int64  `json:"offset,omitempty"`
+	Size   uint64 `json:"size,omitempty"` // size in bytes
+}
+
+type AbstractFiler interface {
+	CreateEntry(Entry) (error)
+	AppendFileChunk(FullPath, FileChunk) (err error)
+	FindEntry(FullPath) (found bool, fileEntry Entry, err error)
+	DeleteEntry(FullPath) (fileEntry Entry, err error)
+
+	ListDirectoryEntries(dirPath FullPath) ([]Entry, error)
+	UpdateEntry(Entry) (error)
+}
+
+var ErrNotFound = errors.New("filer: no entry is found in filer store")
+
+type FilerStore interface {
+	CreateEntry(Entry) (error)
+	AppendFileChunk(FullPath, FileChunk) (err error)
+	FindEntry(FullPath) (found bool, fileEntry Entry, err error)
+	DeleteEntry(FullPath) (fileEntry Entry, err error)
+
+	ListDirectoryEntries(dirPath FullPath) ([]Entry, error)
+	UpdateEntry(Entry) (error)
+}