Browse Source

lib/model, lib/protocol: Index sending/receiving debugging (#9657)

This adds guardrails to the index sending and receiving, to verify that
what we thinks is happening is what actually happens.
Jakob Borg 1 year ago
parent
commit
42e677c055
6 changed files with 497 additions and 228 deletions
  1. 16 1
      lib/db/util.go
  2. 52 0
      lib/db/util_test.go
  3. 122 10
      lib/model/indexhandler.go
  4. 5 4
      lib/model/model.go
  5. 295 209
      lib/protocol/bep.pb.go
  6. 7 4
      proto/lib/protocol/bep.proto

+ 16 - 1
lib/db/util.go

@@ -20,10 +20,14 @@ type FileInfoBatch struct {
 	infos   []protocol.FileInfo
 	size    int
 	flushFn func([]protocol.FileInfo) error
+	error   error
 }
 
 // NewFileInfoBatch returns a new FileInfoBatch that calls fn when it's time
-// to flush.
+// to flush. Errors from the flush function are considered non-recoverable;
+// once an error is returned the flush function wil not be called again, and
+// any further calls to Flush will return the same error (unless Reset is
+// called).
 func NewFileInfoBatch(fn func([]protocol.FileInfo) error) *FileInfoBatch {
 	return &FileInfoBatch{flushFn: fn}
 }
@@ -33,6 +37,9 @@ func (b *FileInfoBatch) SetFlushFunc(fn func([]protocol.FileInfo) error) {
 }
 
 func (b *FileInfoBatch) Append(f protocol.FileInfo) {
+	if b.error != nil {
+		panic("bug: calling append on a failed batch")
+	}
 	if b.infos == nil {
 		b.infos = make([]protocol.FileInfo, 0, MaxBatchSizeFiles)
 	}
@@ -45,6 +52,9 @@ func (b *FileInfoBatch) Full() bool {
 }
 
 func (b *FileInfoBatch) FlushIfFull() error {
+	if b.error != nil {
+		return b.error
+	}
 	if b.Full() {
 		return b.Flush()
 	}
@@ -52,10 +62,14 @@ func (b *FileInfoBatch) FlushIfFull() error {
 }
 
 func (b *FileInfoBatch) Flush() error {
+	if b.error != nil {
+		return b.error
+	}
 	if len(b.infos) == 0 {
 		return nil
 	}
 	if err := b.flushFn(b.infos); err != nil {
+		b.error = err
 		return err
 	}
 	b.Reset()
@@ -64,6 +78,7 @@ func (b *FileInfoBatch) Flush() error {
 
 func (b *FileInfoBatch) Reset() {
 	b.infos = nil
+	b.error = nil
 	b.size = 0
 }
 

+ 52 - 0
lib/db/util_test.go

@@ -8,12 +8,14 @@ package db
 
 import (
 	"encoding/json"
+	"errors"
 	"io"
 	"os"
 	"testing"
 
 	"github.com/syncthing/syncthing/lib/db/backend"
 	"github.com/syncthing/syncthing/lib/events"
+	"github.com/syncthing/syncthing/lib/protocol"
 )
 
 // writeJSONS serializes the database to a JSON stream that can be checked
@@ -178,3 +180,53 @@ func snapshot(t testing.TB, fset *FileSet) *Snapshot {
 // 	defer fd.Close()
 // 	writeJSONS(fd, db)
 // }
+
+func TestFileInfoBatchError(t *testing.T) {
+	// Verify behaviour of the flush function returning an error.
+
+	var errReturn error
+	var called int
+	b := NewFileInfoBatch(func([]protocol.FileInfo) error {
+		called += 1
+		return errReturn
+	})
+
+	// Flush should work when the flush function error is nil
+	b.Append(protocol.FileInfo{Name: "test"})
+	if err := b.Flush(); err != nil {
+		t.Fatalf("expected nil, got %v", err)
+	}
+	if called != 1 {
+		t.Fatalf("expected 1, got %d", called)
+	}
+
+	// Flush should fail with an error retur
+	errReturn = errors.New("problem")
+	b.Append(protocol.FileInfo{Name: "test"})
+	if err := b.Flush(); err != errReturn {
+		t.Fatalf("expected %v, got %v", errReturn, err)
+	}
+	if called != 2 {
+		t.Fatalf("expected 2, got %d", called)
+	}
+
+	// Flush function should not be called again when it's already errored,
+	// same error should be returned by Flush()
+	if err := b.Flush(); err != errReturn {
+		t.Fatalf("expected %v, got %v", errReturn, err)
+	}
+	if called != 2 {
+		t.Fatalf("expected 2, got %d", called)
+	}
+
+	// Reset should clear the error (and the file list)
+	errReturn = nil
+	b.Reset()
+	b.Append(protocol.FileInfo{Name: "test"})
+	if err := b.Flush(); err != nil {
+		t.Fatalf("expected nil, got %v", err)
+	}
+	if called != 3 {
+		t.Fatalf("expected 3, got %d", called)
+	}
+}

+ 122 - 10
lib/model/indexhandler.go

@@ -17,6 +17,7 @@ import (
 	"github.com/syncthing/syncthing/lib/events"
 	"github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/svcutil"
+	"github.com/syncthing/syncthing/lib/ur"
 )
 
 type indexHandler struct {
@@ -222,15 +223,49 @@ func (s *indexHandler) pause() {
 // sendIndexTo sends file infos with a sequence number higher than prevSequence and
 // returns the highest sent sequence number.
 func (s *indexHandler) sendIndexTo(ctx context.Context, fset *db.FileSet) error {
+	// Keep track of the previous sequence we sent. This is separate from
+	// s.prevSequence because the latter will skip over holes in the
+	// sequence numberings, while sentPrevSequence should always be
+	// precisely the highest previously sent sequence.
+	sentPrevSequence := s.prevSequence
+
 	initial := s.prevSequence == 0
 	batch := db.NewFileInfoBatch(nil)
+	var batchError error
 	batch.SetFlushFunc(func(fs []protocol.FileInfo) error {
+		if len(fs) == 0 {
+			// can't happen, flush is not called with an empty batch
+			panic("bug: flush called with empty batch (race condition?)")
+		}
+		if batchError != nil {
+			// can't happen, once an error is returned the index sender exits
+			panic(fmt.Sprintf("bug: once failed it should stay failed (%v)", batchError))
+		}
 		l.Debugf("%v: Sending %d files (<%d bytes)", s, len(fs), batch.Size())
+
+		lastSequence := fs[len(fs)-1].Sequence
+		var err error
 		if initial {
 			initial = false
-			return s.conn.Index(ctx, &protocol.Index{Folder: s.folder, Files: fs})
+			err = s.conn.Index(ctx, &protocol.Index{
+				Folder:       s.folder,
+				Files:        fs,
+				LastSequence: lastSequence,
+			})
+		} else {
+			err = s.conn.IndexUpdate(ctx, &protocol.IndexUpdate{
+				Folder:       s.folder,
+				Files:        fs,
+				PrevSequence: sentPrevSequence,
+				LastSequence: lastSequence,
+			})
+		}
+		if err != nil {
+			batchError = err
+			return err
 		}
-		return s.conn.IndexUpdate(ctx, &protocol.IndexUpdate{Folder: s.folder, Files: fs})
+		sentPrevSequence = lastSequence
+		return nil
 	})
 
 	var err error
@@ -251,14 +286,19 @@ func (s *indexHandler) sendIndexTo(ctx context.Context, fset *db.FileSet) error
 			}
 		}
 
-		if shouldDebug() {
-			if fi.SequenceNo() < s.prevSequence+1 {
-				panic(fmt.Sprintln("sequence lower than requested, got:", fi.SequenceNo(), ", asked to start at:", s.prevSequence+1))
-			}
+		if fi.SequenceNo() < s.prevSequence+1 {
+			s.logSequenceAnomaly("database returned sequence lower than requested", map[string]any{
+				"sequence": fi.SequenceNo(),
+				"start":    s.prevSequence + 1,
+			})
 		}
 
 		if f.Sequence > 0 && fi.SequenceNo() <= f.Sequence {
-			l.Warnln("Non-increasing sequence detected: Checking and repairing the db...")
+			s.logSequenceAnomaly("database returned non-increasing sequence", map[string]any{
+				"sequence": fi.SequenceNo(),
+				"start":    s.prevSequence + 1,
+				"previous": f.Sequence,
+			})
 			// Abort this round of index sending - the next one will pick
 			// up from the last successful one with the repeaired db.
 			defer func() {
@@ -307,7 +347,7 @@ func (s *indexHandler) sendIndexTo(ctx context.Context, fset *db.FileSet) error
 	return nil
 }
 
-func (s *indexHandler) receive(fs []protocol.FileInfo, update bool, op string) error {
+func (s *indexHandler) receive(fs []protocol.FileInfo, update bool, op string, prevSequence, lastSequence int64) error {
 	deviceID := s.conn.DeviceID()
 
 	s.cond.L.Lock()
@@ -328,12 +368,66 @@ func (s *indexHandler) receive(fs []protocol.FileInfo, update bool, op string) e
 	if !update {
 		fset.Drop(deviceID)
 	}
+
+	l.Debugf("Received %d files for %s from %s, prevSeq=%d, lastSeq=%d", len(fs), s.folder, deviceID.Short(), prevSequence, lastSequence)
+
+	// Verify that the previous sequence number matches what we expected
+	if exp := fset.Sequence(deviceID); prevSequence > 0 && prevSequence != exp {
+		s.logSequenceAnomaly("index update with unexpected sequence", map[string]any{
+			"prevSeq":      prevSequence,
+			"lastSeq":      lastSequence,
+			"batch":        len(fs),
+			"expectedPrev": exp,
+		})
+	}
+
 	for i := range fs {
+		// Verify index in relation to the claimed sequence boundaries
+		if fs[i].Sequence < prevSequence {
+			s.logSequenceAnomaly("file with sequence before prevSequence", map[string]any{
+				"prevSeq": prevSequence,
+				"lastSeq": lastSequence,
+				"batch":   len(fs),
+				"seenSeq": fs[i].Sequence,
+				"atIndex": i,
+			})
+		}
+		if lastSequence > 0 && fs[i].Sequence > lastSequence {
+			s.logSequenceAnomaly("file with sequence after lastSequence", map[string]any{
+				"prevSeq": prevSequence,
+				"lastSeq": lastSequence,
+				"batch":   len(fs),
+				"seenSeq": fs[i].Sequence,
+				"atIndex": i,
+			})
+		}
+		if i > 0 && fs[i].Sequence <= fs[i-1].Sequence {
+			s.logSequenceAnomaly("index update with non-increasing sequence", map[string]any{
+				"prevSeq":      prevSequence,
+				"lastSeq":      lastSequence,
+				"batch":        len(fs),
+				"seenSeq":      fs[i].Sequence,
+				"atIndex":      i,
+				"precedingSeq": fs[i-1].Sequence,
+			})
+		}
+
 		// The local attributes should never be transmitted over the wire.
 		// Make sure they look like they weren't.
 		fs[i].LocalFlags = 0
 		fs[i].VersionHash = nil
 	}
+
+	// Verify the claimed last sequence number
+	if lastSequence > 0 && len(fs) > 0 && lastSequence != fs[len(fs)-1].Sequence {
+		s.logSequenceAnomaly("index update with unexpected last sequence", map[string]any{
+			"prevSeq": prevSequence,
+			"lastSeq": lastSequence,
+			"batch":   len(fs),
+			"seenSeq": fs[len(fs)-1].Sequence,
+		})
+	}
+
 	fset.Update(deviceID, fs)
 
 	seq := fset.Sequence(deviceID)
@@ -348,6 +442,24 @@ func (s *indexHandler) receive(fs []protocol.FileInfo, update bool, op string) e
 	return nil
 }
 
+var warnSequenceAnomalyOnce sync.Once
+
+func (s *indexHandler) logSequenceAnomaly(msg string, extra map[string]any) {
+	warnSequenceAnomalyOnce.Do(func() {
+		l.Warnf("Index sequence anomaly detected (please report at https://forum.syncthing.net/t/22660): %s (%v)", msg, extra)
+	})
+
+	extraStrs := make(map[string]string, len(extra))
+	for k, v := range extra {
+		extraStrs[k] = fmt.Sprint(v)
+	}
+
+	s.evLogger.Log(events.Failure, ur.FailureData{
+		Description: msg,
+		Extra:       extraStrs,
+	})
+}
+
 func prepareFileInfoForIndex(f protocol.FileInfo) protocol.FileInfo {
 	// Mark the file as invalid if any of the local bad stuff flags are set.
 	f.RawInvalid = f.IsInvalid()
@@ -534,7 +646,7 @@ func (r *indexHandlerRegistry) folderRunningLocked(folder config.FolderConfigura
 	}
 }
 
-func (r *indexHandlerRegistry) ReceiveIndex(folder string, fs []protocol.FileInfo, update bool, op string) error {
+func (r *indexHandlerRegistry) ReceiveIndex(folder string, fs []protocol.FileInfo, update bool, op string, prevSequence, lastSequence int64) error {
 	r.mut.Lock()
 	defer r.mut.Unlock()
 	is, isOk := r.indexHandlers.Get(folder)
@@ -542,7 +654,7 @@ func (r *indexHandlerRegistry) ReceiveIndex(folder string, fs []protocol.FileInf
 		l.Infof("%v for nonexistent or paused folder %q", op, folder)
 		return fmt.Errorf("%s: %w", folder, ErrFolderMissing)
 	}
-	return is.receive(fs, update, op)
+	return is.receive(fs, update, op, prevSequence, lastSequence)
 }
 
 // makeForgetUpdate takes an index update and constructs a download progress update

+ 5 - 4
lib/model/model.go

@@ -1136,16 +1136,16 @@ func (p *pager) done() bool {
 // Index is called when a new device is connected and we receive their full index.
 // Implements the protocol.Model interface.
 func (m *model) Index(conn protocol.Connection, idx *protocol.Index) error {
-	return m.handleIndex(conn, idx.Folder, idx.Files, false)
+	return m.handleIndex(conn, idx.Folder, idx.Files, false, 0, idx.LastSequence)
 }
 
 // IndexUpdate is called for incremental updates to connected devices' indexes.
 // Implements the protocol.Model interface.
 func (m *model) IndexUpdate(conn protocol.Connection, idxUp *protocol.IndexUpdate) error {
-	return m.handleIndex(conn, idxUp.Folder, idxUp.Files, true)
+	return m.handleIndex(conn, idxUp.Folder, idxUp.Files, true, idxUp.PrevSequence, idxUp.LastSequence)
 }
 
-func (m *model) handleIndex(conn protocol.Connection, folder string, fs []protocol.FileInfo, update bool) error {
+func (m *model) handleIndex(conn protocol.Connection, folder string, fs []protocol.FileInfo, update bool, prevSequence, lastSequence int64) error {
 	op := "Index"
 	if update {
 		op += " update"
@@ -1173,7 +1173,8 @@ func (m *model) handleIndex(conn protocol.Connection, folder string, fs []protoc
 		l.Debugf("%v for folder (ID %q) sent from device %q: missing index handler", op, folder, deviceID)
 		return fmt.Errorf("%s: %w", folder, ErrFolderNotRunning)
 	}
-	return indexHandler.ReceiveIndex(folder, fs, update, op)
+
+	return indexHandler.ReceiveIndex(folder, fs, update, op, prevSequence, lastSequence)
 }
 
 type clusterConfigDeviceInfo struct {

+ 295 - 209
lib/protocol/bep.pb.go

@@ -418,8 +418,9 @@ func (m *Device) XXX_DiscardUnknown() {
 var xxx_messageInfo_Device proto.InternalMessageInfo
 
 type Index struct {
-	Folder string     `protobuf:"bytes,1,opt,name=folder,proto3" json:"folder" xml:"folder"`
-	Files  []FileInfo `protobuf:"bytes,2,rep,name=files,proto3" json:"files" xml:"file"`
+	Folder       string     `protobuf:"bytes,1,opt,name=folder,proto3" json:"folder" xml:"folder"`
+	Files        []FileInfo `protobuf:"bytes,2,rep,name=files,proto3" json:"files" xml:"file"`
+	LastSequence int64      `protobuf:"varint,3,opt,name=last_sequence,json=lastSequence,proto3" json:"lastSequence" xml:"lastSequence"`
 }
 
 func (m *Index) Reset()         { *m = Index{} }
@@ -456,8 +457,10 @@ func (m *Index) XXX_DiscardUnknown() {
 var xxx_messageInfo_Index proto.InternalMessageInfo
 
 type IndexUpdate struct {
-	Folder string     `protobuf:"bytes,1,opt,name=folder,proto3" json:"folder" xml:"folder"`
-	Files  []FileInfo `protobuf:"bytes,2,rep,name=files,proto3" json:"files" xml:"file"`
+	Folder       string     `protobuf:"bytes,1,opt,name=folder,proto3" json:"folder" xml:"folder"`
+	Files        []FileInfo `protobuf:"bytes,2,rep,name=files,proto3" json:"files" xml:"file"`
+	LastSequence int64      `protobuf:"varint,3,opt,name=last_sequence,json=lastSequence,proto3" json:"lastSequence" xml:"lastSequence"`
+	PrevSequence int64      `protobuf:"varint,4,opt,name=prev_sequence,json=prevSequence,proto3" json:"prevSequence" xml:"prevSequence"`
 }
 
 func (m *IndexUpdate) Reset()         { *m = IndexUpdate{} }
@@ -1145,211 +1148,213 @@ func init() {
 func init() { proto.RegisterFile("lib/protocol/bep.proto", fileDescriptor_311ef540e10d9705) }
 
 var fileDescriptor_311ef540e10d9705 = []byte{
-	// 3251 bytes of a gzipped FileDescriptorProto
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+	0x2e, 0x97, 0x4f, 0xcf, 0x2a, 0x77, 0xce, 0x2b, 0xc9, 0x10, 0xfc, 0x01, 0xba, 0x95, 0x50, 0xa5,
+	0x8d, 0xcf, 0x9f, 0x34, 0x3a, 0xbb, 0xc5, 0x4c, 0xf9, 0xce, 0xe9, 0x59, 0x05, 0x6b, 0x5a, 0x51,
+	0x99, 0x58, 0x47, 0xb7, 0xcf, 0x69, 0x74, 0x76, 0xda, 0xad, 0x4e, 0xa3, 0x98, 0x2d, 0xdf, 0x3d,
+	0x3d, 0xab, 0xdc, 0x4c, 0xa8, 0xc8, 0xac, 0x52, 0x43, 0x2b, 0x09, 0x9d, 0x7a, 0xfb, 0x8b, 0xd6,
+	0x76, 0x7b, 0xa3, 0xde, 0xdd, 0xa1, 0xed, 0x2d, 0xda, 0xe8, 0x74, 0x8a, 0xb9, 0xb2, 0x71, 0x7a,
+	0x56, 0xb9, 0xa7, 0x29, 0x5f, 0x38, 0xe1, 0x6b, 0x68, 0x39, 0x61, 0x64, 0xa7, 0xd9, 0xda, 0x2a,
+	0xe6, 0xcb, 0x37, 0x4f, 0xcf, 0x2a, 0x37, 0x34, 0x3d, 0xee, 0xcb, 0x0b, 0xfb, 0x57, 0xdb, 0x6e,
+	0x77, 0x1a, 0xc5, 0xd9, 0x0b, 0xfb, 0x07, 0x0e, 0x5f, 0xfb, 0xbb, 0x14, 0xc2, 0x17, 0xff, 0x38,
+	0x88, 0x3f, 0x40, 0xa5, 0xc8, 0x48, 0xad, 0xfd, 0x78, 0x87, 0xaf, 0xb3, 0xd9, 0x6e, 0x75, 0x5b,
+	0xed, 0x56, 0xa3, 0x38, 0x93, 0xd8, 0x55, 0x4d, 0xab, 0xe5, 0x3a, 0x0c, 0xb7, 0xd1, 0xdd, 0xcb,
+	0x34, 0xb7, 0x9f, 0xbd, 0x5f, 0x4c, 0x95, 0xd7, 0x4f, 0xcf, 0x2a, 0xb7, 0x2f, 0x2a, 0x6e, 0x3f,
+	0x7b, 0xff, 0x77, 0x7f, 0xf5, 0xdd, 0xcb, 0x05, 0x6b, 0xbc, 0x01, 0xd2, 0x97, 0xf6, 0x1e, 0xba,
+	0xa5, 0x1b, 0x7e, 0xdc, 0xd8, 0xdd, 0xa8, 0x6f, 0xec, 0x6e, 0x14, 0x67, 0x84, 0x0f, 0x34, 0xea,
+	0x63, 0x16, 0x98, 0x90, 0x76, 0xbf, 0x87, 0x96, 0x13, 0x5f, 0xd1, 0x78, 0xda, 0xa0, 0x51, 0x44,
+	0xe9, 0xeb, 0x67, 0x87, 0xcc, 0xc3, 0xdf, 0x47, 0x58, 0x27, 0x6f, 0x6c, 0x7f, 0xb1, 0xf1, 0x65,
+	0xa7, 0x98, 0x2e, 0xdf, 0x3e, 0x3d, 0xab, 0x2c, 0x6b, 0xec, 0x8d, 0xc1, 0x91, 0x79, 0xe2, 0xaf,
+	0xfd, 0x53, 0x1a, 0x2d, 0xe8, 0xef, 0x46, 0xf8, 0xfb, 0xe8, 0xe6, 0x66, 0x73, 0x9b, 0x47, 0xe2,
+	0x66, 0x5b, 0x78, 0x80, 0x0f, 0x8b, 0x33, 0x62, 0x3a, 0x9d, 0xca, 0x7f, 0xe3, 0x3f, 0x42, 0xa5,
+	0x73, 0xf4, 0x7a, 0x93, 0x36, 0x6a, 0xbb, 0x6d, 0xfa, 0x65, 0x31, 0x55, 0x7e, 0x8b, 0x6f, 0x98,
+	0xae, 0x53, 0xb7, 0x3d, 0x48, 0x41, 0x27, 0xf8, 0x13, 0x74, 0xef, 0x9c, 0x62, 0xe7, 0xcb, 0xc7,
+	0xdb, 0xcd, 0xd6, 0x67, 0x62, 0xbe, 0x74, 0xf9, 0xed, 0xd3, 0xb3, 0xca, 0x5d, 0x5d, 0xb7, 0x23,
+	0x9e, 0xe2, 0x38, 0x54, 0x48, 0xe1, 0x47, 0xa8, 0x72, 0x85, 0x7e, 0xbc, 0x80, 0x4c, 0x99, 0x9c,
+	0x9e, 0x55, 0xee, 0x5f, 0x62, 0x44, 0xad, 0xa3, 0x90, 0xc2, 0x3f, 0x44, 0x77, 0x2e, 0xb7, 0x14,
+	0x9d, 0x8b, 0x4b, 0xf4, 0xd7, 0xfe, 0x35, 0x85, 0xe6, 0x54, 0xd5, 0xe3, 0x9b, 0xd6, 0xa0, 0xb4,
+	0xcd, 0x93, 0x44, 0xbd, 0xd1, 0x6d, 0xb5, 0xbb, 0x30, 0x8a, 0x36, 0x4d, 0xf1, 0x5a, 0x2e, 0xfc,
+	0xe4, 0x31, 0xae, 0xd1, 0xb7, 0x1a, 0xad, 0x06, 0x6d, 0xd6, 0x22, 0x8f, 0x2a, 0xf6, 0x16, 0x73,
+	0x98, 0x67, 0xf7, 0xf0, 0xfb, 0xe8, 0x6e, 0xd2, 0x78, 0xe7, 0x49, 0xed, 0x51, 0xb4, 0x4b, 0xb0,
+	0x40, 0x6d, 0x82, 0xce, 0xb8, 0x77, 0x00, 0x8e, 0xf9, 0x51, 0x42, 0xab, 0xd9, 0x7a, 0xba, 0xb1,
+	0xdd, 0xac, 0x0b, 0xad, 0x4c, 0xb9, 0x74, 0x7a, 0x56, 0xb9, 0xa5, 0xb4, 0xe4, 0x03, 0x07, 0x57,
+	0x5b, 0xfb, 0x5d, 0x0a, 0xad, 0x7c, 0x7d, 0xf1, 0xc2, 0x5f, 0xa0, 0x77, 0x60, 0xbf, 0x2e, 0xa4,
+	0x02, 0x99, 0xb7, 0xc4, 0x1e, 0x6e, 0xec, 0xec, 0x34, 0x5a, 0xf5, 0xe2, 0x4c, 0x79, 0xf5, 0xf4,
+	0xac, 0xf2, 0xe0, 0xeb, 0x4d, 0x6e, 0x8c, 0x46, 0xcc, 0xb1, 0xae, 0x69, 0x78, 0xb3, 0x4d, 0xb7,
+	0x1a, 0xbb, 0xc5, 0xd4, 0x75, 0x0c, 0x6f, 0xba, 0x5e, 0x9f, 0x05, 0xd5, 0xc7, 0x2f, 0xbe, 0x5a,
+	0x99, 0x79, 0xf9, 0xd5, 0xca, 0xcc, 0x8b, 0x57, 0x2b, 0xa9, 0x97, 0xaf, 0x56, 0x52, 0x7f, 0xfd,
+	0x7a, 0x65, 0xe6, 0xd7, 0xaf, 0x57, 0x52, 0x2f, 0x5f, 0xaf, 0xcc, 0xfc, 0xdb, 0xeb, 0x95, 0x99,
+	0x67, 0xdf, 0xeb, 0xdb, 0xc1, 0xc1, 0x78, 0xef, 0x61, 0xcf, 0x1d, 0xbe, 0xeb, 0x9f, 0x38, 0xbd,
+	0xe0, 0xc0, 0x76, 0xfa, 0xda, 0x2f, 0xfd, 0x1f, 0x58, 0xf6, 0xf2, 0xf0, 0xeb, 0x87, 0xff, 0x1b,
+	0x00, 0x00, 0xff, 0xff, 0xa6, 0x37, 0xc7, 0xbf, 0xd7, 0x22, 0x00, 0x00,
 }
 
 func (m *Hello) Marshal() (dAtA []byte, err error) {
@@ -1707,6 +1712,11 @@ func (m *Index) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if m.LastSequence != 0 {
+		i = encodeVarintBep(dAtA, i, uint64(m.LastSequence))
+		i--
+		dAtA[i] = 0x18
+	}
 	if len(m.Files) > 0 {
 		for iNdEx := len(m.Files) - 1; iNdEx >= 0; iNdEx-- {
 			{
@@ -1751,6 +1761,16 @@ func (m *IndexUpdate) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if m.PrevSequence != 0 {
+		i = encodeVarintBep(dAtA, i, uint64(m.PrevSequence))
+		i--
+		dAtA[i] = 0x20
+	}
+	if m.LastSequence != 0 {
+		i = encodeVarintBep(dAtA, i, uint64(m.LastSequence))
+		i--
+		dAtA[i] = 0x18
+	}
 	if len(m.Files) > 0 {
 		for iNdEx := len(m.Files) - 1; iNdEx >= 0; iNdEx-- {
 			{
@@ -2781,6 +2801,9 @@ func (m *Index) ProtoSize() (n int) {
 			n += 1 + l + sovBep(uint64(l))
 		}
 	}
+	if m.LastSequence != 0 {
+		n += 1 + sovBep(uint64(m.LastSequence))
+	}
 	return n
 }
 
@@ -2800,6 +2823,12 @@ func (m *IndexUpdate) ProtoSize() (n int) {
 			n += 1 + l + sovBep(uint64(l))
 		}
 	}
+	if m.LastSequence != 0 {
+		n += 1 + sovBep(uint64(m.LastSequence))
+	}
+	if m.PrevSequence != 0 {
+		n += 1 + sovBep(uint64(m.PrevSequence))
+	}
 	return n
 }
 
@@ -4200,6 +4229,25 @@ func (m *Index) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field LastSequence", wireType)
+			}
+			m.LastSequence = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowBep
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.LastSequence |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipBep(dAtA[iNdEx:])
@@ -4316,6 +4364,44 @@ func (m *IndexUpdate) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field LastSequence", wireType)
+			}
+			m.LastSequence = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowBep
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.LastSequence |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field PrevSequence", wireType)
+			}
+			m.PrevSequence = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowBep
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.PrevSequence |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipBep(dAtA[iNdEx:])

+ 7 - 4
proto/lib/protocol/bep.proto

@@ -81,13 +81,16 @@ enum Compression {
 // Index and Index Update
 
 message Index {
-    string            folder = 1;
-    repeated FileInfo files  = 2;
+    string            folder        = 1;
+    repeated FileInfo files         = 2;
+    int64             last_sequence = 3; // the highest sequence in this batch
 }
 
 message IndexUpdate {
-    string            folder = 1;
-    repeated FileInfo files  = 2;
+    string            folder        = 1;
+    repeated FileInfo files         = 2;
+    int64             last_sequence = 3; // the highest sequence in this batch
+    int64             prev_sequence = 4; // the highest sequence in the previous batch
 }
 
 message FileInfo {