add ReadRemote(), add read remote setup when filer starts

weed/filer/read_remote.go

@@ -0,0 +1,27 @@
+package filer
+
+import (
+	"fmt"
+	"io"
+)
+
+func (entry *Entry) IsRemoteOnly() bool {
+	return len(entry.Chunks) == 0 && entry.Remote != nil && entry.Remote.Size > 0
+}
+
+func (f *Filer) ReadRemote(w io.Writer, entry *Entry, offset int64, size int64) error {
+	client, _, found := f.RemoteStorage.GetRemoteStorageClient(remoteEntry.Remote.StorageName)
+	if !found {
+		return fmt.Errorf("remote storage %v not found", entry.Remote.StorageName)
+	}
+
+	mountDir, remoteLoation := f.RemoteStorage.FindMountDirectory(entry.FullPath)
+	_, bucket, path := remoteLoation.NameBucketPath()
+
+	remoteFullPath := path + string(entry.FullPath[len(mountDir):])
+
+	client.ReadFile(bucket, remoteFullPath[1:], offset, size, func(w io.Writer) error {
+
+	})
+	return nil
+}