pruner + proto change: better handling of missing replication cursor

- don't treat missing replication cursor as an error in protocol
- treat it as a per-fs planning error instead

daemon/pruner/pruner.go

@@ -274,6 +274,9 @@ func (p *Pruner) Error() error {
 type fs struct {
 	path  string
 
+	// permanent error during planning
+	planErr error
+
 	// snapshots presented by target
 	// (type snapshot)
 	snaps []pruning.Snapshot
@@ -296,7 +299,9 @@ func (f *fs) Report() FSReport {
 	r := FSReport{}
 	r.Filesystem = f.path
 	r.ErrorCount = f.execErrCount
-	if f.execErrLast != nil {
+	if f.planErr != nil {
+		r.LastError = f.planErr.Error()
+	} else  if f.execErrLast != nil {
 		r.LastError = f.execErrLast.Error()
 	}
 
@@ -413,11 +418,13 @@ func statePlan(a *args, u updater) state {
 			l.WithError(err).Error("cannot get replication cursor")
 			return onErr(u, err)
 		}
-		if rc.GetError() != "" {
-			l.WithField("reqErr", rc.GetError()).Error("cannot get replication cursor")
-			return onErr(u, err)
-		}
 		ka.MadeProgress()
+		if rc.GetNotexist()  {
+			l.Error("replication cursor does not exist, skipping")
+			pfs.destroyList = []pruning.Snapshot{}
+			pfs.planErr = fmt.Errorf("replication cursor bookmark does not exist (one successful replication is required before pruning works)")
+			continue
+		}
 
 
 		// scan from older to newer, all snapshots older than cursor are interpreted as replicated

endpoint/endpoint.go

@@ -118,7 +118,7 @@ func (p *Sender) ReplicationCursor(ctx context.Context, req *pdu.ReplicationCurs
 			return nil, err
 		}
 		if cursor == nil {
-			return &pdu.ReplicationCursorRes{Result: &pdu.ReplicationCursorRes_Error{Error: "cursor does not exist"}}, nil
+			return &pdu.ReplicationCursorRes{Result: &pdu.ReplicationCursorRes_Notexist{Notexist: true}}, nil
 		}
 		return &pdu.ReplicationCursorRes{Result: &pdu.ReplicationCursorRes_Guid{Guid: cursor.Guid}}, nil
 	case *pdu.ReplicationCursorReq_Set:

replication/fsrep/fsfsm.go

@@ -463,16 +463,11 @@ func (s *ReplicationStep) doMarkReplicated(ctx context.Context, ka *watchdog.Kee
 			},
 		},
 	}
-	res, err := sender.ReplicationCursor(ctx, req)
+	_, err := sender.ReplicationCursor(ctx, req)
 	if err != nil {
 		log.WithError(err).Error("error advancing replication cursor")
 		return err
 	}
-	if res.GetError() != "" {
-		err := fmt.Errorf("cannot advance replication cursor: %s", res.GetError())
-		log.Error(err.Error())
-		return err
-	}
 	ka.MadeProgress()
 
 	s.state = StepCompleted

replication/pdu/pdu.pb.go

@@ -951,7 +951,7 @@ func (m *ReplicationCursorReq_SetOp) GetSnapshot() string {
 type ReplicationCursorRes struct {
 	// Types that are valid to be assigned to Result:
 	//	*ReplicationCursorRes_Guid
-	//	*ReplicationCursorRes_Error
+	//	*ReplicationCursorRes_Notexist
 	Result               isReplicationCursorRes_Result `protobuf_oneof:"Result"`
 	XXX_NoUnkeyedLiteral struct{}                      `json:"-"`
 	XXX_unrecognized     []byte                        `json:"-"`
@@ -991,13 +991,13 @@ type ReplicationCursorRes_Guid struct {
 	Guid uint64 `protobuf:"varint,1,opt,name=Guid,proto3,oneof"`
 }
 
-type ReplicationCursorRes_Error struct {
+type ReplicationCursorRes_Notexist struct {
-	Error string `protobuf:"bytes,2,opt,name=Error,proto3,oneof"`
+	Notexist bool `protobuf:"varint,2,opt,name=Notexist,proto3,oneof"`
 }
 
 func (*ReplicationCursorRes_Guid) isReplicationCursorRes_Result() {}
 
-func (*ReplicationCursorRes_Error) isReplicationCursorRes_Result() {}
+func (*ReplicationCursorRes_Notexist) isReplicationCursorRes_Result() {}
 
 func (m *ReplicationCursorRes) GetResult() isReplicationCursorRes_Result {
 	if m != nil {
@@ -1013,18 +1013,18 @@ func (m *ReplicationCursorRes) GetGuid() uint64 {
 	return 0
 }
 
-func (m *ReplicationCursorRes) GetError() string {
+func (m *ReplicationCursorRes) GetNotexist() bool {
-	if x, ok := m.GetResult().(*ReplicationCursorRes_Error); ok {
+	if x, ok := m.GetResult().(*ReplicationCursorRes_Notexist); ok {
-		return x.Error
+		return x.Notexist
 	}
-	return ""
+	return false
 }
 
 // XXX_OneofFuncs is for the internal use of the proto package.
 func (*ReplicationCursorRes) XXX_OneofFuncs() (func(msg proto.Message, b *proto.Buffer) error, func(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error), func(msg proto.Message) (n int), []interface{}) {
 	return _ReplicationCursorRes_OneofMarshaler, _ReplicationCursorRes_OneofUnmarshaler, _ReplicationCursorRes_OneofSizer, []interface{}{
 		(*ReplicationCursorRes_Guid)(nil),
-		(*ReplicationCursorRes_Error)(nil),
+		(*ReplicationCursorRes_Notexist)(nil),
 	}
 }
 
@@ -1035,9 +1035,13 @@ func _ReplicationCursorRes_OneofMarshaler(msg proto.Message, b *proto.Buffer) er
 	case *ReplicationCursorRes_Guid:
 		b.EncodeVarint(1<<3 | proto.WireVarint)
 		b.EncodeVarint(uint64(x.Guid))
-	case *ReplicationCursorRes_Error:
+	case *ReplicationCursorRes_Notexist:
-		b.EncodeVarint(2<<3 | proto.WireBytes)
+		t := uint64(0)
-		b.EncodeStringBytes(x.Error)
+		if x.Notexist {
+			t = 1
+		}
+		b.EncodeVarint(2<<3 | proto.WireVarint)
+		b.EncodeVarint(t)
 	case nil:
 	default:
 		return fmt.Errorf("ReplicationCursorRes.Result has unexpected type %T", x)
@@ -1055,12 +1059,12 @@ func _ReplicationCursorRes_OneofUnmarshaler(msg proto.Message, tag, wire int, b
 		x, err := b.DecodeVarint()
 		m.Result = &ReplicationCursorRes_Guid{x}
 		return true, err
-	case 2: // Result.Error
+	case 2: // Result.Notexist
-		if wire != proto.WireBytes {
+		if wire != proto.WireVarint {
 			return true, proto.ErrInternalBadWireType
 		}
-		x, err := b.DecodeStringBytes()
+		x, err := b.DecodeVarint()
-		m.Result = &ReplicationCursorRes_Error{x}
+		m.Result = &ReplicationCursorRes_Notexist{x != 0}
 		return true, err
 	default:
 		return false, nil
@@ -1074,10 +1078,9 @@ func _ReplicationCursorRes_OneofSizer(msg proto.Message) (n int) {
 	case *ReplicationCursorRes_Guid:
 		n += 1 // tag and wire
 		n += proto.SizeVarint(uint64(x.Guid))
-	case *ReplicationCursorRes_Error:
+	case *ReplicationCursorRes_Notexist:
 		n += 1 // tag and wire
-		n += proto.SizeVarint(uint64(len(x.Error)))
+		n += 1
-		n += len(x.Error)
 	case nil:
 	default:
 		panic(fmt.Sprintf("proto: unexpected type %T in oneof", x))
@@ -1110,47 +1113,47 @@ func init() {
 func init() { proto.RegisterFile("pdu.proto", fileDescriptor_5e683fe3d6db3968) }
 
 var fileDescriptor_5e683fe3d6db3968 = []byte{
-	// 657 bytes of a gzipped FileDescriptorProto
+	// 659 bytes of a gzipped FileDescriptorProto
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-	0x6f, 0xcc, 0xe1, 0x13, 0x93, 0xfb, 0xa5, 0xd4, 0xe6, 0x9e, 0x07, 0xb5, 0xb9, 0x4f, 0x9f, 0x6a,
+	0x34, 0xf8, 0x10, 0xe8, 0x38, 0x9f, 0xdb, 0x2b, 0x88, 0x2c, 0xd2, 0x75, 0xa1, 0x1a, 0xbb, 0xf5,
-	0xf4, 0xb7, 0x71, 0xfc, 0x3b, 0x00, 0x00, 0xff, 0xff, 0x02, 0x35, 0xe7, 0x43, 0x43, 0x06, 0x00,
+	0xad, 0x4a, 0x7f, 0x1e, 0x87, 0xff, 0x02, 0x00, 0x00, 0xff, 0xff, 0x66, 0x74, 0x36, 0x3a, 0x49,
-	0x00,
+	0x06, 0x00, 0x00,
 }

replication/pdu/pdu.proto

@@ -113,6 +113,6 @@ message ReplicationCursorReq {
 message ReplicationCursorRes {
     oneof Result {
         uint64 Guid = 1;
-        string Error = 2;
+        bool Notexist = 2;
     }
 }