Change to protocol buffer for volume-join-masster message

Reduced size to about 1/5 of the previous json format message

go/storage/volume_info.go

@@ -1,6 +1,8 @@
 package storage
 
-import ()
+import (
+	"code.google.com/p/weed-fs/go/operation"
+)
 
 type VolumeInfo struct {
 	Id               VolumeId
@@ -13,3 +15,22 @@ type VolumeInfo struct {
 	DeletedByteCount uint64
 	ReadOnly         bool
 }
+
+func NewVolumeInfo(m *operation.VolumeInformationMessage) (vi VolumeInfo, err error) {
+	vi = VolumeInfo{
+		Id:               VolumeId(*m.Id),
+		Size:             *m.Size,
+		Collection:       *m.Collection,
+		FileCount:        int(*m.FileCount),
+		DeleteCount:      int(*m.DeleteCount),
+		DeletedByteCount: *m.DeletedByteCount,
+		ReadOnly:         *m.ReadOnly,
+		Version:          Version(*m.Version),
+	}
+	rp, e := NewReplicaPlacementFromByte(byte(*m.ReplicaPlacement))
+	if e != nil {
+		return vi, e
+	}
+	vi.ReplicaPlacement = rp
+	return vi, nil
+}