syncthing/lib/db/transactions.go

1002 lines
26 KiB
Go

// Copyright (C) 2014 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package db
import (
"bytes"
"errors"
"fmt"
"github.com/syncthing/syncthing/lib/db/backend"
"github.com/syncthing/syncthing/lib/events"
"github.com/syncthing/syncthing/lib/osutil"
"github.com/syncthing/syncthing/lib/protocol"
)
var (
errEntryFromGlobalMissing = errors.New("device present in global list but missing as device/fileinfo entry")
errEmptyGlobal = errors.New("no versions in global list")
errEmptyFileVersion = errors.New("no devices in global file version")
)
// A readOnlyTransaction represents a database snapshot.
type readOnlyTransaction struct {
backend.ReadTransaction
keyer keyer
evLogger events.Logger
}
func (db *Lowlevel) newReadOnlyTransaction() (readOnlyTransaction, error) {
tran, err := db.NewReadTransaction()
if err != nil {
return readOnlyTransaction{}, err
}
return db.readOnlyTransactionFromBackendTransaction(tran), nil
}
func (db *Lowlevel) readOnlyTransactionFromBackendTransaction(tran backend.ReadTransaction) readOnlyTransaction {
return readOnlyTransaction{
ReadTransaction: tran,
keyer: db.keyer,
evLogger: db.evLogger,
}
}
func (t readOnlyTransaction) close() {
t.Release()
}
func (t readOnlyTransaction) getFile(folder, device, file []byte) (protocol.FileInfo, bool, error) {
key, err := t.keyer.GenerateDeviceFileKey(nil, folder, device, file)
if err != nil {
return protocol.FileInfo{}, false, err
}
return t.getFileByKey(key)
}
func (t readOnlyTransaction) getFileByKey(key []byte) (protocol.FileInfo, bool, error) {
f, ok, err := t.getFileTrunc(key, false)
if err != nil || !ok {
return protocol.FileInfo{}, false, err
}
return f.(protocol.FileInfo), true, nil
}
func (t readOnlyTransaction) getFileTrunc(key []byte, trunc bool) (protocol.FileIntf, bool, error) {
bs, err := t.Get(key)
if backend.IsNotFound(err) {
return nil, false, nil
}
if err != nil {
return nil, false, err
}
f, err := t.unmarshalTrunc(bs, trunc)
if backend.IsNotFound(err) {
return nil, false, nil
}
if err != nil {
return nil, false, err
}
return f, true, nil
}
func (t readOnlyTransaction) unmarshalTrunc(bs []byte, trunc bool) (protocol.FileIntf, error) {
if trunc {
var tf FileInfoTruncated
err := tf.Unmarshal(bs)
if err != nil {
return nil, err
}
if err := t.fillTruncated(&tf); err != nil {
return nil, err
}
return tf, nil
}
var fi protocol.FileInfo
if err := fi.Unmarshal(bs); err != nil {
return nil, err
}
if err := t.fillFileInfo(&fi); err != nil {
return nil, err
}
return fi, nil
}
type blocksIndirectionError struct {
err error
}
func (e *blocksIndirectionError) Error() string {
return fmt.Sprintf("filling Blocks: %v", e.err)
}
func (e *blocksIndirectionError) Unwrap() error {
return e.err
}
// fillFileInfo follows the (possible) indirection of blocks and version
// vector and fills it out.
func (t readOnlyTransaction) fillFileInfo(fi *protocol.FileInfo) error {
var key []byte
if len(fi.Blocks) == 0 && len(fi.BlocksHash) != 0 {
// The blocks list is indirected and we need to load it.
key = t.keyer.GenerateBlockListKey(key, fi.BlocksHash)
bs, err := t.Get(key)
if err != nil {
return &blocksIndirectionError{err}
}
var bl BlockList
if err := bl.Unmarshal(bs); err != nil {
return err
}
fi.Blocks = bl.Blocks
}
if len(fi.VersionHash) != 0 {
key = t.keyer.GenerateVersionKey(key, fi.VersionHash)
bs, err := t.Get(key)
if err != nil {
return fmt.Errorf("filling Version: %w", err)
}
var v protocol.Vector
if err := v.Unmarshal(bs); err != nil {
return err
}
fi.Version = v
}
return nil
}
// fillTruncated follows the (possible) indirection of version vector and
// fills it.
func (t readOnlyTransaction) fillTruncated(fi *FileInfoTruncated) error {
var key []byte
if len(fi.VersionHash) == 0 {
return nil
}
key = t.keyer.GenerateVersionKey(key, fi.VersionHash)
bs, err := t.Get(key)
if err != nil {
return err
}
var v protocol.Vector
if err := v.Unmarshal(bs); err != nil {
return err
}
fi.Version = v
return nil
}
func (t readOnlyTransaction) getGlobalVersions(keyBuf, folder, file []byte) (VersionList, error) {
var err error
keyBuf, err = t.keyer.GenerateGlobalVersionKey(keyBuf, folder, file)
if err != nil {
return VersionList{}, err
}
return t.getGlobalVersionsByKey(keyBuf)
}
func (t readOnlyTransaction) getGlobalVersionsByKey(key []byte) (VersionList, error) {
bs, err := t.Get(key)
if err != nil {
return VersionList{}, err
}
var vl VersionList
if err := vl.Unmarshal(bs); err != nil {
return VersionList{}, err
}
return vl, nil
}
func (t readOnlyTransaction) getGlobal(keyBuf, folder, file []byte, truncate bool) ([]byte, protocol.FileIntf, bool, error) {
vl, err := t.getGlobalVersions(keyBuf, folder, file)
if backend.IsNotFound(err) {
return keyBuf, nil, false, nil
} else if err != nil {
return nil, nil, false, err
}
var fi protocol.FileIntf
keyBuf, fi, err = t.getGlobalFromVersionList(keyBuf, folder, file, truncate, vl)
return keyBuf, fi, true, err
}
func (t readOnlyTransaction) getGlobalFromVersionList(keyBuf, folder, file []byte, truncate bool, vl VersionList) ([]byte, protocol.FileIntf, error) {
fv, ok := vl.GetGlobal()
if !ok {
return keyBuf, nil, errEmptyGlobal
}
keyBuf, fi, err := t.getGlobalFromFileVersion(keyBuf, folder, file, truncate, fv)
return keyBuf, fi, err
}
func (t readOnlyTransaction) getGlobalFromFileVersion(keyBuf, folder, file []byte, truncate bool, fv FileVersion) ([]byte, protocol.FileIntf, error) {
dev, ok := fv.FirstDevice()
if !ok {
return keyBuf, nil, errEmptyFileVersion
}
keyBuf, err := t.keyer.GenerateDeviceFileKey(keyBuf, folder, dev, file)
if err != nil {
return keyBuf, nil, err
}
fi, ok, err := t.getFileTrunc(keyBuf, truncate)
if err != nil {
return keyBuf, nil, err
}
if !ok {
return keyBuf, nil, errEntryFromGlobalMissing
}
return keyBuf, fi, nil
}
func (t *readOnlyTransaction) withHave(folder, device, prefix []byte, truncate bool, fn Iterator) error {
if len(prefix) > 0 {
unslashedPrefix := prefix
if bytes.HasSuffix(prefix, []byte{'/'}) {
unslashedPrefix = unslashedPrefix[:len(unslashedPrefix)-1]
} else {
prefix = append(prefix, '/')
}
key, err := t.keyer.GenerateDeviceFileKey(nil, folder, device, unslashedPrefix)
if err != nil {
return err
}
if f, ok, err := t.getFileTrunc(key, truncate); err != nil {
return err
} else if ok && !fn(f) {
return nil
}
}
key, err := t.keyer.GenerateDeviceFileKey(nil, folder, device, prefix)
if err != nil {
return err
}
dbi, err := t.NewPrefixIterator(key)
if err != nil {
return err
}
defer dbi.Release()
for dbi.Next() {
name := t.keyer.NameFromDeviceFileKey(dbi.Key())
if len(prefix) > 0 && !bytes.HasPrefix(name, prefix) {
return nil
}
f, err := t.unmarshalTrunc(dbi.Value(), truncate)
if err != nil {
l.Debugln("unmarshal error:", err)
continue
}
if !fn(f) {
return nil
}
}
return dbi.Error()
}
func (t *readOnlyTransaction) withHaveSequence(folder []byte, startSeq int64, fn Iterator) error {
first, err := t.keyer.GenerateSequenceKey(nil, folder, startSeq)
if err != nil {
return err
}
last, err := t.keyer.GenerateSequenceKey(nil, folder, maxInt64)
if err != nil {
return err
}
dbi, err := t.NewRangeIterator(first, last)
if err != nil {
return err
}
defer dbi.Release()
for dbi.Next() {
f, ok, err := t.getFileByKey(dbi.Value())
if err != nil {
return err
}
if !ok {
l.Debugln("missing file for sequence number", t.keyer.SequenceFromSequenceKey(dbi.Key()))
continue
}
if shouldDebug() {
if seq := t.keyer.SequenceFromSequenceKey(dbi.Key()); f.Sequence != seq {
l.Debugf("Sequence index corruption (folder %v, file %v): sequence %d != expected %d", string(folder), f.Name, f.Sequence, seq)
}
}
if !fn(f) {
return nil
}
}
return dbi.Error()
}
func (t *readOnlyTransaction) withGlobal(folder, prefix []byte, truncate bool, fn Iterator) error {
if len(prefix) > 0 {
unslashedPrefix := prefix
if bytes.HasSuffix(prefix, []byte{'/'}) {
unslashedPrefix = unslashedPrefix[:len(unslashedPrefix)-1]
} else {
prefix = append(prefix, '/')
}
if _, f, ok, err := t.getGlobal(nil, folder, unslashedPrefix, truncate); err != nil {
return err
} else if ok && !fn(f) {
return nil
}
}
key, err := t.keyer.GenerateGlobalVersionKey(nil, folder, prefix)
if err != nil {
return err
}
dbi, err := t.NewPrefixIterator(key)
if err != nil {
return err
}
defer dbi.Release()
var dk []byte
for dbi.Next() {
name := t.keyer.NameFromGlobalVersionKey(dbi.Key())
if len(prefix) > 0 && !bytes.HasPrefix(name, prefix) {
return nil
}
var vl VersionList
if err := vl.Unmarshal(dbi.Value()); err != nil {
return err
}
var f protocol.FileIntf
dk, f, err = t.getGlobalFromVersionList(dk, folder, name, truncate, vl)
if err != nil {
return err
}
if !fn(f) {
return nil
}
}
if err != nil {
return err
}
return dbi.Error()
}
func (t *readOnlyTransaction) withBlocksHash(folder, hash []byte, iterator Iterator) error {
key, err := t.keyer.GenerateBlockListMapKey(nil, folder, hash, nil)
if err != nil {
return err
}
iter, err := t.NewPrefixIterator(key)
if err != nil {
return err
}
defer iter.Release()
for iter.Next() {
file := string(t.keyer.NameFromBlockListMapKey(iter.Key()))
f, ok, err := t.getFile(folder, protocol.LocalDeviceID[:], []byte(osutil.NormalizedFilename(file)))
if err != nil {
return err
}
if !ok {
continue
}
f.Name = osutil.NativeFilename(f.Name)
if !bytes.Equal(f.BlocksHash, hash) {
msg := "Mismatching block map list hashes"
t.evLogger.Log(events.Failure, fmt.Sprintln(msg, "in withBlocksHash"))
l.Warnf("%v: got %x expected %x", msg, f.BlocksHash, hash)
continue
}
if f.IsDeleted() || f.IsInvalid() || f.IsDirectory() || f.IsSymlink() {
msg := "Found something of unexpected type in block list map"
t.evLogger.Log(events.Failure, fmt.Sprintln(msg, "in withBlocksHash"))
l.Warnf("%v: %s", msg, f)
continue
}
if !iterator(f) {
break
}
}
return iter.Error()
}
func (t *readOnlyTransaction) availability(folder, file []byte) ([]protocol.DeviceID, error) {
vl, err := t.getGlobalVersions(nil, folder, file)
if backend.IsNotFound(err) {
return nil, nil
}
if err != nil {
return nil, err
}
fv, ok := vl.GetGlobal()
if !ok {
return nil, nil
}
devices := make([]protocol.DeviceID, len(fv.Devices))
for i, dev := range fv.Devices {
n, err := protocol.DeviceIDFromBytes(dev)
if err != nil {
return nil, err
}
devices[i] = n
}
return devices, nil
}
func (t *readOnlyTransaction) withNeed(folder, device []byte, truncate bool, fn Iterator) error {
if bytes.Equal(device, protocol.LocalDeviceID[:]) {
return t.withNeedLocal(folder, truncate, fn)
}
return t.withNeedIteratingGlobal(folder, device, truncate, fn)
}
func (t *readOnlyTransaction) withNeedIteratingGlobal(folder, device []byte, truncate bool, fn Iterator) error {
key, err := t.keyer.GenerateGlobalVersionKey(nil, folder, nil)
if err != nil {
return err
}
dbi, err := t.NewPrefixIterator(key.WithoutName())
if err != nil {
return err
}
defer dbi.Release()
var dk []byte
devID, err := protocol.DeviceIDFromBytes(device)
if err != nil {
return err
}
for dbi.Next() {
var vl VersionList
if err := vl.Unmarshal(dbi.Value()); err != nil {
return err
}
globalFV, ok := vl.GetGlobal()
if !ok {
return errEmptyGlobal
}
haveFV, have := vl.Get(device)
if !Need(globalFV, have, haveFV.Version) {
continue
}
name := t.keyer.NameFromGlobalVersionKey(dbi.Key())
var gf protocol.FileIntf
dk, gf, err = t.getGlobalFromFileVersion(dk, folder, name, truncate, globalFV)
if err != nil {
return err
}
if shouldDebug() {
if globalDev, ok := globalFV.FirstDevice(); ok {
globalID, _ := protocol.DeviceIDFromBytes(globalDev)
l.Debugf("need folder=%q device=%v name=%q have=%v invalid=%v haveV=%v haveDeleted=%v globalV=%v globalDeleted=%v globalDev=%v", folder, devID, name, have, haveFV.IsInvalid(), haveFV.Version, haveFV.Deleted, gf.FileVersion(), globalFV.Deleted, globalID)
}
}
if !fn(gf) {
return dbi.Error()
}
}
return dbi.Error()
}
func (t *readOnlyTransaction) withNeedLocal(folder []byte, truncate bool, fn Iterator) error {
key, err := t.keyer.GenerateNeedFileKey(nil, folder, nil)
if err != nil {
return err
}
dbi, err := t.NewPrefixIterator(key.WithoutName())
if err != nil {
return err
}
defer dbi.Release()
var keyBuf []byte
var f protocol.FileIntf
var ok bool
for dbi.Next() {
keyBuf, f, ok, err = t.getGlobal(keyBuf, folder, t.keyer.NameFromGlobalVersionKey(dbi.Key()), truncate)
if err != nil {
return err
}
if !ok {
continue
}
if !fn(f) {
return nil
}
}
return dbi.Error()
}
// A readWriteTransaction is a readOnlyTransaction plus a batch for writes.
// The batch will be committed on close() or by checkFlush() if it exceeds the
// batch size.
type readWriteTransaction struct {
backend.WriteTransaction
readOnlyTransaction
indirectionTracker
}
type indirectionTracker interface {
recordIndirectionHashesForFile(f *protocol.FileInfo)
}
func (db *Lowlevel) newReadWriteTransaction(hooks ...backend.CommitHook) (readWriteTransaction, error) {
tran, err := db.NewWriteTransaction(hooks...)
if err != nil {
return readWriteTransaction{}, err
}
return readWriteTransaction{
WriteTransaction: tran,
readOnlyTransaction: db.readOnlyTransactionFromBackendTransaction(tran),
indirectionTracker: db,
}, nil
}
func (t readWriteTransaction) Commit() error {
// The readOnlyTransaction must close after commit, because they may be
// backed by the same actual lower level transaction.
defer t.readOnlyTransaction.close()
return t.WriteTransaction.Commit()
}
func (t readWriteTransaction) close() {
t.readOnlyTransaction.close()
t.WriteTransaction.Release()
}
// putFile stores a file in the database, taking care of indirected fields.
func (t readWriteTransaction) putFile(fkey []byte, fi protocol.FileInfo) error {
var bkey []byte
// Always set the blocks hash when there are blocks.
if len(fi.Blocks) > 0 {
fi.BlocksHash = protocol.BlocksHash(fi.Blocks)
} else {
fi.BlocksHash = nil
}
// Indirect the blocks if the block list is large enough.
if len(fi.Blocks) > blocksIndirectionCutoff {
bkey = t.keyer.GenerateBlockListKey(bkey, fi.BlocksHash)
if _, err := t.Get(bkey); backend.IsNotFound(err) {
// Marshal the block list and save it
blocksBs := mustMarshal(&BlockList{Blocks: fi.Blocks})
if err := t.Put(bkey, blocksBs); err != nil {
return err
}
} else if err != nil {
return err
}
fi.Blocks = nil
}
// Indirect the version vector if it's large enough.
if len(fi.Version.Counters) > versionIndirectionCutoff {
fi.VersionHash = protocol.VectorHash(fi.Version)
bkey = t.keyer.GenerateVersionKey(bkey, fi.VersionHash)
if _, err := t.Get(bkey); backend.IsNotFound(err) {
// Marshal the version vector and save it
versionBs := mustMarshal(&fi.Version)
if err := t.Put(bkey, versionBs); err != nil {
return err
}
} else if err != nil {
return err
}
fi.Version = protocol.Vector{}
} else {
fi.VersionHash = nil
}
t.indirectionTracker.recordIndirectionHashesForFile(&fi)
fiBs := mustMarshal(&fi)
return t.Put(fkey, fiBs)
}
// updateGlobal adds this device+version to the version list for the given
// file. If the device is already present in the list, the version is updated.
// If the file does not have an entry in the global list, it is created.
func (t readWriteTransaction) updateGlobal(gk, keyBuf, folder, device []byte, file protocol.FileInfo, meta *metadataTracker) ([]byte, error) {
deviceID, err := protocol.DeviceIDFromBytes(device)
if err != nil {
return nil, err
}
l.Debugf("update global; folder=%q device=%v file=%q version=%v invalid=%v", folder, deviceID, file.Name, file.Version, file.IsInvalid())
fl, err := t.getGlobalVersionsByKey(gk)
if err != nil && !backend.IsNotFound(err) {
return nil, err
}
globalFV, oldGlobalFV, removedFV, haveOldGlobal, haveRemoved, globalChanged, err := fl.update(folder, device, file, t.readOnlyTransaction)
if err != nil {
return nil, err
}
name := []byte(file.Name)
l.Debugf(`new global for "%v" after update: %v`, file.Name, fl)
if err := t.Put(gk, mustMarshal(&fl)); err != nil {
return nil, err
}
// Only load those from db if actually needed
var gotGlobal, gotOldGlobal bool
var global, oldGlobal protocol.FileIntf
// Check the need of the device that was updated
// Must happen before updating global meta: If this is the first
// item from this device, it will be initialized with the global state.
needBefore := haveOldGlobal && Need(oldGlobalFV, haveRemoved, removedFV.Version)
needNow := Need(globalFV, true, file.Version)
if needBefore {
if keyBuf, oldGlobal, err = t.getGlobalFromFileVersion(keyBuf, folder, name, true, oldGlobalFV); err != nil {
return nil, err
}
gotOldGlobal = true
meta.removeNeeded(deviceID, oldGlobal)
if !needNow && bytes.Equal(device, protocol.LocalDeviceID[:]) {
if keyBuf, err = t.updateLocalNeed(keyBuf, folder, name, false); err != nil {
return nil, err
}
}
}
if needNow {
keyBuf, global, err = t.getGlobalFromFileVersion(keyBuf, folder, name, true, globalFV)
if err != nil {
return nil, err
}
gotGlobal = true
meta.addNeeded(deviceID, global)
if !needBefore && bytes.Equal(device, protocol.LocalDeviceID[:]) {
if keyBuf, err = t.updateLocalNeed(keyBuf, folder, name, true); err != nil {
return nil, err
}
}
}
// Update global size counter if necessary
if !globalChanged {
// Neither the global state nor the needs of any devices, except
// the one updated, changed.
return keyBuf, nil
}
// Remove the old global from the global size counter
if haveOldGlobal {
if !gotOldGlobal {
if keyBuf, oldGlobal, err = t.getGlobalFromFileVersion(keyBuf, folder, name, true, oldGlobalFV); err != nil {
return nil, err
}
}
// Remove the old global from the global size counter
meta.removeFile(protocol.GlobalDeviceID, oldGlobal)
}
// Add the new global to the global size counter
if !gotGlobal {
if globalFV.Version.Equal(file.Version) {
// The inserted file is the global file
global = file
} else {
keyBuf, global, err = t.getGlobalFromFileVersion(keyBuf, folder, name, true, globalFV)
if err != nil {
return nil, err
}
}
gotGlobal = true
}
meta.addFile(protocol.GlobalDeviceID, global)
// check for local (if not already done before)
if !bytes.Equal(device, protocol.LocalDeviceID[:]) {
localFV, haveLocal := fl.Get(protocol.LocalDeviceID[:])
needBefore := haveOldGlobal && Need(oldGlobalFV, haveLocal, localFV.Version)
needNow := Need(globalFV, haveLocal, localFV.Version)
if needBefore {
meta.removeNeeded(protocol.LocalDeviceID, oldGlobal)
if !needNow {
if keyBuf, err = t.updateLocalNeed(keyBuf, folder, name, false); err != nil {
return nil, err
}
}
}
if needNow {
meta.addNeeded(protocol.LocalDeviceID, global)
if !needBefore {
if keyBuf, err = t.updateLocalNeed(keyBuf, folder, name, true); err != nil {
return nil, err
}
}
}
}
for _, dev := range meta.devices() {
if bytes.Equal(dev[:], device) {
// Already handled above
continue
}
fv, have := fl.Get(dev[:])
if haveOldGlobal && Need(oldGlobalFV, have, fv.Version) {
meta.removeNeeded(dev, oldGlobal)
}
if Need(globalFV, have, fv.Version) {
meta.addNeeded(dev, global)
}
}
return keyBuf, nil
}
func (t readWriteTransaction) updateLocalNeed(keyBuf, folder, name []byte, add bool) ([]byte, error) {
var err error
keyBuf, err = t.keyer.GenerateNeedFileKey(keyBuf, folder, name)
if err != nil {
return nil, err
}
if add {
l.Debugf("local need insert; folder=%q, name=%q", folder, name)
err = t.Put(keyBuf, nil)
} else {
l.Debugf("local need delete; folder=%q, name=%q", folder, name)
err = t.Delete(keyBuf)
}
return keyBuf, err
}
func Need(global FileVersion, haveLocal bool, localVersion protocol.Vector) bool {
// We never need an invalid file or a file without a valid version (just
// another way of expressing "invalid", really, until we fix that
// part...).
if global.IsInvalid() || global.Version.IsEmpty() {
return false
}
// We don't need a deleted file if we don't have it.
if global.Deleted && !haveLocal {
return false
}
// We don't need the global file if we already have the same version.
if haveLocal && localVersion.GreaterEqual(global.Version) {
return false
}
return true
}
// removeFromGlobal removes the device from the global version list for the
// given file. If the version list is empty after this, the file entry is
// removed entirely.
func (t readWriteTransaction) removeFromGlobal(gk, keyBuf, folder, device, file []byte, meta *metadataTracker) ([]byte, error) {
deviceID, err := protocol.DeviceIDFromBytes(device)
if err != nil {
return nil, err
}
l.Debugf("remove from global; folder=%q device=%v file=%q", folder, deviceID, file)
fl, err := t.getGlobalVersionsByKey(gk)
if backend.IsNotFound(err) {
// We might be called to "remove" a global version that doesn't exist
// if the first update for the file is already marked invalid.
return keyBuf, nil
} else if err != nil {
return nil, err
}
oldGlobalFV, haveOldGlobal := fl.GetGlobal()
oldGlobalFV = oldGlobalFV.copy()
if !haveOldGlobal {
// Shouldn't ever happen, but doesn't hurt to handle.
t.evLogger.Log(events.Failure, "encountered empty global while removing item")
return keyBuf, t.Delete(gk)
}
removedFV, haveRemoved, globalChanged := fl.pop(device)
if !haveRemoved {
// There is no version for the given device
return keyBuf, nil
}
var global protocol.FileIntf
var gotGlobal bool
globalFV, haveGlobal := fl.GetGlobal()
// Add potential needs of the removed device
if haveGlobal && !globalFV.IsInvalid() && Need(globalFV, false, protocol.Vector{}) && !Need(oldGlobalFV, haveRemoved, removedFV.Version) {
keyBuf, global, err = t.getGlobalFromVersionList(keyBuf, folder, file, true, fl)
if err != nil {
return nil, err
}
gotGlobal = true
meta.addNeeded(deviceID, global)
if bytes.Equal(protocol.LocalDeviceID[:], device) {
if keyBuf, err = t.updateLocalNeed(keyBuf, folder, file, true); err != nil {
return nil, err
}
}
}
// Global hasn't changed, abort early
if !globalChanged {
l.Debugf("new global after remove: %v", fl)
if err := t.Put(gk, mustMarshal(&fl)); err != nil {
return nil, err
}
return keyBuf, nil
}
var oldGlobal protocol.FileIntf
keyBuf, oldGlobal, err = t.getGlobalFromFileVersion(keyBuf, folder, file, true, oldGlobalFV)
if err != nil {
return nil, err
}
meta.removeFile(protocol.GlobalDeviceID, oldGlobal)
// Remove potential device needs
shouldRemoveNeed := func(dev protocol.DeviceID) bool {
fv, have := fl.Get(dev[:])
if !Need(oldGlobalFV, have, fv.Version) {
return false // Didn't need it before
}
return !haveGlobal || !Need(globalFV, have, fv.Version)
}
if shouldRemoveNeed(protocol.LocalDeviceID) {
meta.removeNeeded(protocol.LocalDeviceID, oldGlobal)
if keyBuf, err = t.updateLocalNeed(keyBuf, folder, file, false); err != nil {
return nil, err
}
}
for _, dev := range meta.devices() {
if bytes.Equal(dev[:], device) { // Was the previous global
continue
}
if shouldRemoveNeed(dev) {
meta.removeNeeded(dev, oldGlobal)
}
}
// Nothing left, i.e. nothing to add to the global counter below.
if fl.Empty() {
if err := t.Delete(gk); err != nil {
return nil, err
}
return keyBuf, nil
}
// Add to global
if !gotGlobal {
keyBuf, global, err = t.getGlobalFromVersionList(keyBuf, folder, file, true, fl)
if err != nil {
return nil, err
}
}
meta.addFile(protocol.GlobalDeviceID, global)
l.Debugf(`new global for "%s" after remove: %v`, file, fl)
if err := t.Put(gk, mustMarshal(&fl)); err != nil {
return nil, err
}
return keyBuf, nil
}
func (t readWriteTransaction) deleteKeyPrefix(prefix []byte) error {
return t.deleteKeyPrefixMatching(prefix, func([]byte) bool { return true })
}
func (t readWriteTransaction) deleteKeyPrefixMatching(prefix []byte, match func(key []byte) bool) error {
dbi, err := t.NewPrefixIterator(prefix)
if err != nil {
return err
}
defer dbi.Release()
for dbi.Next() {
if !match(dbi.Key()) {
continue
}
if err := t.Delete(dbi.Key()); err != nil {
return err
}
}
return dbi.Error()
}
func (t *readWriteTransaction) withAllFolderTruncated(folder []byte, fn func(device []byte, f FileInfoTruncated) bool) error {
key, err := t.keyer.GenerateDeviceFileKey(nil, folder, nil, nil)
if err != nil {
return err
}
dbi, err := t.NewPrefixIterator(key.WithoutNameAndDevice())
if err != nil {
return err
}
defer dbi.Release()
var gk, keyBuf []byte
for dbi.Next() {
device, ok := t.keyer.DeviceFromDeviceFileKey(dbi.Key())
if !ok {
// Not having the device in the index is bad. Clear it.
if err := t.Delete(dbi.Key()); err != nil {
return err
}
continue
}
intf, err := t.unmarshalTrunc(dbi.Value(), true)
if err != nil {
return err
}
f := intf.(FileInfoTruncated)
switch f.Name {
case "", ".", "..", "/": // A few obviously invalid filenames
l.Infof("Dropping invalid filename %q from database", f.Name)
name := []byte(f.Name)
gk, err = t.keyer.GenerateGlobalVersionKey(gk, folder, name)
if err != nil {
return err
}
keyBuf, err = t.removeFromGlobal(gk, keyBuf, folder, device, name, nil)
if err != nil {
return err
}
if err := t.Delete(dbi.Key()); err != nil {
return err
}
continue
}
if !fn(device, f) {
return nil
}
}
return dbi.Error()
}
type marshaller interface {
Marshal() ([]byte, error)
}
func mustMarshal(f marshaller) []byte {
bs, err := f.Marshal()
if err != nil {
panic(err)
}
return bs
}