This commit is contained in:
Simon Frei
@@ -0,0 +1,549 @@
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// Copyright (C) 2020 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package model
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import (
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"context"
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"fmt"
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"sync"
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"time"
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"github.com/thejerf/suture/v4"
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"github.com/syncthing/syncthing/lib/config"
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"github.com/syncthing/syncthing/lib/db"
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"github.com/syncthing/syncthing/lib/events"
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"github.com/syncthing/syncthing/lib/protocol"
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"github.com/syncthing/syncthing/lib/svcutil"
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)
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type indexHandler struct {
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conn protocol.Connection
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downloads *deviceDownloadState
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folder string
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folderIsReceiveEncrypted bool
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prevSequence int64
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evLogger events.Logger
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token suture.ServiceToken
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cond *sync.Cond
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paused bool
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fset *db.FileSet
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runner service
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}
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func newIndexHandler(conn protocol.Connection, downloads *deviceDownloadState, folder config.FolderConfiguration, fset *db.FileSet, runner service, startInfo *clusterConfigDeviceInfo, evLogger events.Logger) *indexHandler {
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myIndexID := fset.IndexID(protocol.LocalDeviceID)
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mySequence := fset.Sequence(protocol.LocalDeviceID)
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var startSequence int64
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// This is the other side's description of what it knows
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// about us. Lets check to see if we can start sending index
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// updates directly or need to send the index from start...
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if startInfo.local.IndexID == myIndexID {
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// They say they've seen our index ID before, so we can
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// send a delta update only.
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if startInfo.local.MaxSequence > mySequence {
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// Safety check. They claim to have more or newer
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// index data than we have - either we have lost
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// index data, or reset the index without resetting
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// the IndexID, or something else weird has
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// happened. We send a full index to reset the
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// situation.
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l.Infof("Device %v folder %s is delta index compatible, but seems out of sync with reality", conn.ID().Short(), folder.Description())
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startSequence = 0
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} else {
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l.Debugf("Device %v folder %s is delta index compatible (mlv=%d)", conn.ID().Short(), folder.Description(), startInfo.local.MaxSequence)
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startSequence = startInfo.local.MaxSequence
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}
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} else if startInfo.local.IndexID != 0 {
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// They say they've seen an index ID from us, but it's
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// not the right one. Either they are confused or we
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// must have reset our database since last talking to
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// them. We'll start with a full index transfer.
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l.Infof("Device %v folder %s has mismatching index ID for us (%v != %v)", conn.ID().Short(), folder.Description(), startInfo.local.IndexID, myIndexID)
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startSequence = 0
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} else {
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l.Debugf("Device %v folder %s has no index ID for us", conn.ID().Short(), folder.Description())
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}
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// This is the other side's description of themselves. We
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// check to see that it matches the IndexID we have on file,
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// otherwise we drop our old index data and expect to get a
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// completely new set.
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theirIndexID := fset.IndexID(conn.ID())
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if startInfo.remote.IndexID == 0 {
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// They're not announcing an index ID. This means they
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// do not support delta indexes and we should clear any
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// information we have from them before accepting their
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// index, which will presumably be a full index.
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l.Debugf("Device %v folder %s does not announce an index ID", conn.ID().Short(), folder.Description())
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fset.Drop(conn.ID())
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} else if startInfo.remote.IndexID != theirIndexID {
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// The index ID we have on file is not what they're
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// announcing. They must have reset their database and
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// will probably send us a full index. We drop any
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// information we have and remember this new index ID
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// instead.
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l.Infof("Device %v folder %s has a new index ID (%v)", conn.ID().Short(), folder.Description(), startInfo.remote.IndexID)
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fset.Drop(conn.ID())
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fset.SetIndexID(conn.ID(), startInfo.remote.IndexID)
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}
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return &indexHandler{
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conn: conn,
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downloads: downloads,
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folder: folder.ID,
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folderIsReceiveEncrypted: folder.Type == config.FolderTypeReceiveEncrypted,
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prevSequence: startSequence,
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evLogger: evLogger,
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fset: fset,
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runner: runner,
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cond: sync.NewCond(new(sync.Mutex)),
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}
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}
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func (s *indexHandler) Serve(ctx context.Context) (err error) {
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l.Debugf("Starting index handler for %s to %s at %s (slv=%d)", s.folder, s.conn.ID(), s.conn, s.prevSequence)
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defer func() {
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err = svcutil.NoRestartErr(err)
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l.Debugf("Exiting index handler for %s to %s at %s: %v", s.folder, s.conn.ID(), s.conn, err)
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}()
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// We need to send one index, regardless of whether there is something to send or not
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s.cond.L.Lock()
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for s.paused {
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s.cond.Wait()
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}
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fset := s.fset
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s.cond.L.Unlock()
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err = s.sendIndexTo(ctx, fset)
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// Subscribe to LocalIndexUpdated (we have new information to send) and
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// DeviceDisconnected (it might be us who disconnected, so we should
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// exit).
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sub := s.evLogger.Subscribe(events.LocalIndexUpdated | events.DeviceDisconnected)
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defer sub.Unsubscribe()
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evChan := sub.C()
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ticker := time.NewTicker(time.Minute)
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defer ticker.Stop()
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for err == nil {
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s.cond.L.Lock()
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for s.paused {
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s.cond.Wait()
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}
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fset := s.fset
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s.cond.L.Unlock()
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// While we have sent a sequence at least equal to the one
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// currently in the database, wait for the local index to update. The
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// local index may update for other folders than the one we are
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// sending for.
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if fset.Sequence(protocol.LocalDeviceID) <= s.prevSequence {
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-evChan:
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case <-ticker.C:
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}
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continue
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}
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err = s.sendIndexTo(ctx, fset)
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// Wait a short amount of time before entering the next loop. If there
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// are continuous changes happening to the local index, this gives us
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// time to batch them up a little.
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-time.After(250 * time.Millisecond):
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}
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}
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return err
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}
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func (s *indexHandler) resume(fset *db.FileSet, runner service) {
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s.cond.L.Lock()
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if !s.paused {
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s.evLogger.Log(events.Failure, "index handler got resumed while not paused")
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}
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s.paused = false
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s.fset = fset
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s.runner = runner
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s.cond.L.Unlock()
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}
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func (s *indexHandler) pause() {
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s.cond.L.Lock()
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if s.paused {
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s.evLogger.Log(events.Failure, "index handler got paused while already paused")
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}
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s.paused = true
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s.fset = nil
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s.runner = nil
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s.cond.L.Unlock()
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}
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// sendIndexTo sends file infos with a sequence number higher than prevSequence and
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// returns the highest sent sequence number.
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func (s *indexHandler) sendIndexTo(ctx context.Context, fset *db.FileSet) error {
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initial := s.prevSequence == 0
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batch := db.NewFileInfoBatch(nil)
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batch.SetFlushFunc(func(fs []protocol.FileInfo) error {
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l.Debugf("%v: Sending %d files (<%d bytes)", s, len(fs), batch.Size())
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if initial {
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initial = false
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return s.conn.Index(ctx, s.folder, fs)
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}
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return s.conn.IndexUpdate(ctx, s.folder, fs)
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})
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var err error
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var f protocol.FileInfo
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snap, err := fset.Snapshot()
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if err != nil {
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return svcutil.AsFatalErr(err, svcutil.ExitError)
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}
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defer snap.Release()
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previousWasDelete := false
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snap.WithHaveSequence(s.prevSequence+1, func(fi protocol.FileIntf) bool {
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// This is to make sure that renames (which is an add followed by a delete) land in the same batch.
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// Even if the batch is full, we allow a last delete to slip in, we do this by making sure that
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// the batch ends with a non-delete, or that the last item in the batch is already a delete
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if batch.Full() && (!fi.IsDeleted() || previousWasDelete) {
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if err = batch.Flush(); err != nil {
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return false
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}
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}
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if shouldDebug() {
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if fi.SequenceNo() < s.prevSequence+1 {
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panic(fmt.Sprintln("sequence lower than requested, got:", fi.SequenceNo(), ", asked to start at:", s.prevSequence+1))
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}
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}
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if f.Sequence > 0 && fi.SequenceNo() <= f.Sequence {
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l.Warnln("Non-increasing sequence detected: Checking and repairing the db...")
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// Abort this round of index sending - the next one will pick
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// up from the last successful one with the repeaired db.
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defer func() {
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if fixed, dbErr := fset.RepairSequence(); dbErr != nil {
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l.Warnln("Failed repairing sequence entries:", dbErr)
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panic("Failed repairing sequence entries")
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} else {
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s.evLogger.Log(events.Failure, "detected and repaired non-increasing sequence")
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l.Infof("Repaired %v sequence entries in database", fixed)
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}
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}()
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return false
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}
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f = fi.(protocol.FileInfo)
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// If this is a folder receiving encrypted files only, we
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// mustn't ever send locally changed file infos. Those aren't
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// encrypted and thus would be a protocol error at the remote.
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if s.folderIsReceiveEncrypted && fi.IsReceiveOnlyChanged() {
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return true
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}
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f = prepareFileInfoForIndex(f)
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previousWasDelete = f.IsDeleted()
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batch.Append(f)
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return true
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})
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if err != nil {
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return err
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}
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err = batch.Flush()
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// True if there was nothing to be sent
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if f.Sequence == 0 {
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return err
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}
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s.prevSequence = f.Sequence
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return err
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}
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func (s *indexHandler) receive(fs []protocol.FileInfo, update bool, op string) error {
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deviceID := s.conn.ID()
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s.cond.L.Lock()
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paused := s.paused
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fset := s.fset
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runner := s.runner
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s.cond.L.Unlock()
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if paused {
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l.Infof("%v for paused folder %q", op, s.folder)
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return fmt.Errorf("%v: %w", s.folder, ErrFolderPaused)
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}
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defer runner.SchedulePull()
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s.downloads.Update(s.folder, makeForgetUpdate(fs))
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if !update {
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fset.Drop(deviceID)
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}
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for i := range fs {
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// The local attributes should never be transmitted over the wire.
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// Make sure they look like they weren't.
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fs[i].LocalFlags = 0
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fs[i].VersionHash = nil
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}
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fset.Update(deviceID, fs)
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seq := fset.Sequence(deviceID)
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s.evLogger.Log(events.RemoteIndexUpdated, map[string]interface{}{
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"device": deviceID.String(),
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"folder": s.folder,
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"items": len(fs),
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"sequence": seq,
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"version": seq, // legacy for sequence
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})
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return nil
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}
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func prepareFileInfoForIndex(f protocol.FileInfo) protocol.FileInfo {
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// Mark the file as invalid if any of the local bad stuff flags are set.
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f.RawInvalid = f.IsInvalid()
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// If the file is marked LocalReceive (i.e., changed locally on a
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// receive only folder) we do not want it to ever become the
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// globally best version, invalid or not.
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if f.IsReceiveOnlyChanged() {
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f.Version = protocol.Vector{}
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}
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// never sent externally
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f.LocalFlags = 0
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f.VersionHash = nil
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return f
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}
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func (s *indexHandler) String() string {
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return fmt.Sprintf("indexHandler@%p for %s to %s at %s", s, s.folder, s.conn.ID().Short(), s.conn)
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}
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type indexHandlerRegistry struct {
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sup *suture.Supervisor
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evLogger events.Logger
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conn protocol.Connection
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downloads *deviceDownloadState
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indexHandlers map[string]*indexHandler
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startInfos map[string]*clusterConfigDeviceInfo
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folderStates map[string]*indexHandlerFolderState
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mut sync.Mutex
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}
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type indexHandlerFolderState struct {
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cfg config.FolderConfiguration
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fset *db.FileSet
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runner service
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}
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func newIndexHandlerRegistry(conn protocol.Connection, downloads *deviceDownloadState, closed chan struct{}, parentSup *suture.Supervisor, evLogger events.Logger) *indexHandlerRegistry {
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r := &indexHandlerRegistry{
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conn: conn,
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downloads: downloads,
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evLogger: evLogger,
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indexHandlers: make(map[string]*indexHandler),
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startInfos: make(map[string]*clusterConfigDeviceInfo),
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folderStates: make(map[string]*indexHandlerFolderState),
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mut: sync.Mutex{},
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}
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r.sup = suture.New(r.String(), svcutil.SpecWithDebugLogger(l))
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ourToken := parentSup.Add(r.sup)
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r.sup.Add(svcutil.AsService(func(ctx context.Context) error {
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-closed:
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parentSup.Remove(ourToken)
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}
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return nil
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}, fmt.Sprintf("%v/waitForClosed", r)))
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return r
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}
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func (r *indexHandlerRegistry) String() string {
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return fmt.Sprintf("indexHandlerRegistry/%v", r.conn.ID().Short())
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}
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func (r *indexHandlerRegistry) GetSupervisor() *suture.Supervisor {
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return r.sup
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}
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func (r *indexHandlerRegistry) startLocked(folder config.FolderConfiguration, fset *db.FileSet, runner service, startInfo *clusterConfigDeviceInfo) {
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if is, ok := r.indexHandlers[folder.ID]; ok {
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r.sup.RemoveAndWait(is.token, 0)
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delete(r.indexHandlers, folder.ID)
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}
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delete(r.startInfos, folder.ID)
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is := newIndexHandler(r.conn, r.downloads, folder, fset, runner, startInfo, r.evLogger)
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is.token = r.sup.Add(is)
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r.indexHandlers[folder.ID] = is
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}
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// AddIndexInfo starts an index handler for given folder, unless it is paused.
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// If it is paused, the given startInfo is stored to start the sender once the
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// folder is resumed.
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// If an index handler is already running, it will be stopped first.
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func (r *indexHandlerRegistry) AddIndexInfo(folder string, startInfo *clusterConfigDeviceInfo) {
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r.mut.Lock()
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defer r.mut.Unlock()
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if is, ok := r.indexHandlers[folder]; ok {
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r.sup.RemoveAndWait(is.token, 0)
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delete(r.indexHandlers, folder)
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l.Debugf("Removed index sender for device %v and folder %v due to added pending", r.conn.ID().Short(), folder)
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}
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folderState, ok := r.folderStates[folder]
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if !ok {
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l.Debugf("Pending index handler for device %v and folder %v", r.conn.ID().Short(), folder)
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r.startInfos[folder] = startInfo
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return
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}
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r.startLocked(folderState.cfg, folderState.fset, folderState.runner, startInfo)
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}
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// Remove stops a running index handler or removes one pending to be started.
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// It is a noop if the folder isn't known.
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func (r *indexHandlerRegistry) Remove(folder string) {
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r.mut.Lock()
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defer r.mut.Unlock()
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l.Debugf("Removing index handler for device %v and folder %v", r.conn.ID().Short(), folder)
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if is, ok := r.indexHandlers[folder]; ok {
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r.sup.RemoveAndWait(is.token, 0)
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delete(r.indexHandlers, folder)
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}
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delete(r.startInfos, folder)
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l.Debugf("Removed index handler for device %v and folder %v", r.conn.ID().Short(), folder)
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}
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// RemoveAllExcept stops all running index handlers and removes those pending to be started,
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// except mentioned ones.
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// It is a noop if the folder isn't known.
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func (r *indexHandlerRegistry) RemoveAllExcept(except map[string]struct{}) {
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r.mut.Lock()
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defer r.mut.Unlock()
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for folder, is := range r.indexHandlers {
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if _, ok := except[folder]; !ok {
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r.sup.RemoveAndWait(is.token, 0)
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delete(r.indexHandlers, folder)
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l.Debugf("Removed index handler for device %v and folder %v (removeAllExcept)", r.conn.ID().Short(), folder)
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}
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}
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for folder := range r.startInfos {
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if _, ok := except[folder]; !ok {
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delete(r.startInfos, folder)
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l.Debugf("Removed pending index handler for device %v and folder %v (removeAllExcept)", r.conn.ID().Short(), folder)
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}
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||||
}
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||||
}
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||||
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||||
// RegisterFolderState must be called whenever something about the folder
|
||||
// changes. The exception being if the folder is removed entirely, then call
|
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// Remove. The fset and runner arguments may be nil, if given folder is paused.
|
||||
func (r *indexHandlerRegistry) RegisterFolderState(folder config.FolderConfiguration, fset *db.FileSet, runner service) {
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if !folder.SharedWith(r.conn.ID()) {
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r.Remove(folder.ID)
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||||
return
|
||||
}
|
||||
|
||||
r.mut.Lock()
|
||||
if folder.Paused {
|
||||
r.folderPausedLocked(folder.ID)
|
||||
} else {
|
||||
r.folderStartedLocked(folder, fset, runner)
|
||||
}
|
||||
r.mut.Unlock()
|
||||
}
|
||||
|
||||
// folderPausedLocked stops a running index handler.
|
||||
// It is a noop if the folder isn't known or has not been started yet.
|
||||
func (r *indexHandlerRegistry) folderPausedLocked(folder string) {
|
||||
l.Debugf("Pausing index handler for device %v and folder %v", r.conn.ID().Short(), folder)
|
||||
delete(r.folderStates, folder)
|
||||
if is, ok := r.indexHandlers[folder]; ok {
|
||||
is.pause()
|
||||
l.Debugf("Paused index handler for device %v and folder %v", r.conn.ID().Short(), folder)
|
||||
} else {
|
||||
l.Debugf("No index handler for device %v and folder %v to pause", r.conn.ID().Short(), folder)
|
||||
}
|
||||
}
|
||||
|
||||
// folderStartedLocked resumes an already running index handler or starts it, if it
|
||||
// was added while paused.
|
||||
// It is a noop if the folder isn't known.
|
||||
func (r *indexHandlerRegistry) folderStartedLocked(folder config.FolderConfiguration, fset *db.FileSet, runner service) {
|
||||
r.folderStates[folder.ID] = &indexHandlerFolderState{
|
||||
cfg: folder,
|
||||
fset: fset,
|
||||
runner: runner,
|
||||
}
|
||||
|
||||
is, isOk := r.indexHandlers[folder.ID]
|
||||
if info, ok := r.startInfos[folder.ID]; ok {
|
||||
if isOk {
|
||||
r.sup.RemoveAndWait(is.token, 0)
|
||||
delete(r.indexHandlers, folder.ID)
|
||||
l.Debugf("Removed index handler for device %v and folder %v in resume", r.conn.ID().Short(), folder.ID)
|
||||
}
|
||||
r.startLocked(folder, fset, runner, info)
|
||||
delete(r.startInfos, folder.ID)
|
||||
l.Debugf("Started index handler for device %v and folder %v in resume", r.conn.ID().Short(), folder.ID)
|
||||
} else if isOk {
|
||||
l.Debugf("Resuming index handler for device %v and folder %v", r.conn.ID().Short(), folder)
|
||||
is.resume(fset, runner)
|
||||
} else {
|
||||
l.Debugf("Not resuming index handler for device %v and folder %v as none is paused and there is no start info", r.conn.ID().Short(), folder.ID)
|
||||
}
|
||||
}
|
||||
|
||||
func (r *indexHandlerRegistry) ReceiveIndex(folder string, fs []protocol.FileInfo, update bool, op string) error {
|
||||
r.mut.Lock()
|
||||
defer r.mut.Unlock()
|
||||
is, isOk := r.indexHandlers[folder]
|
||||
if !isOk {
|
||||
l.Infof("%v for nonexistent or paused folder %q", op, folder)
|
||||
return ErrFolderMissing
|
||||
}
|
||||
return is.receive(fs, update, op)
|
||||
}
|
||||
|
||||
// makeForgetUpdate takes an index update and constructs a download progress update
|
||||
// causing to forget any progress for files which we've just been sent.
|
||||
func makeForgetUpdate(files []protocol.FileInfo) []protocol.FileDownloadProgressUpdate {
|
||||
updates := make([]protocol.FileDownloadProgressUpdate, 0, len(files))
|
||||
for _, file := range files {
|
||||
if file.IsSymlink() || file.IsDirectory() || file.IsDeleted() {
|
||||
continue
|
||||
}
|
||||
updates = append(updates, protocol.FileDownloadProgressUpdate{
|
||||
Name: file.Name,
|
||||
Version: file.Version,
|
||||
UpdateType: protocol.FileDownloadProgressUpdateTypeForget,
|
||||
})
|
||||
}
|
||||
return updates
|
||||
}
|
||||
Reference in New Issue
Block a user