Flush the batch when exceeding a certain size, instead of when reaching a number of batched operations. Move batch to lowlevel to be able to use it in NamespacedKV. Increase the leveldb memory buffer from 4 to 16 MiB.
281 lines
7.9 KiB
Go
281 lines
7.9 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 (
|
|
"github.com/syncthing/syncthing/lib/protocol"
|
|
"github.com/syndtr/goleveldb/leveldb"
|
|
"github.com/syndtr/goleveldb/leveldb/util"
|
|
)
|
|
|
|
// A readOnlyTransaction represents a database snapshot.
|
|
type readOnlyTransaction struct {
|
|
*leveldb.Snapshot
|
|
keyer keyer
|
|
}
|
|
|
|
func (db *instance) newReadOnlyTransaction() readOnlyTransaction {
|
|
snap, err := db.GetSnapshot()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return readOnlyTransaction{
|
|
Snapshot: snap,
|
|
keyer: db.keyer,
|
|
}
|
|
}
|
|
|
|
func (t readOnlyTransaction) close() {
|
|
t.Release()
|
|
}
|
|
|
|
func (t readOnlyTransaction) getFile(folder, device, file []byte) (protocol.FileInfo, bool) {
|
|
return t.getFileByKey(t.keyer.GenerateDeviceFileKey(nil, folder, device, file))
|
|
}
|
|
|
|
func (t readOnlyTransaction) getFileByKey(key []byte) (protocol.FileInfo, bool) {
|
|
if f, ok := t.getFileTrunc(key, false); ok {
|
|
return f.(protocol.FileInfo), true
|
|
}
|
|
return protocol.FileInfo{}, false
|
|
}
|
|
|
|
func (t readOnlyTransaction) getFileTrunc(key []byte, trunc bool) (FileIntf, bool) {
|
|
bs, err := t.Get(key, nil)
|
|
if err == leveldb.ErrNotFound {
|
|
return nil, false
|
|
}
|
|
if err != nil {
|
|
l.Debugln("surprise error:", err)
|
|
return nil, false
|
|
}
|
|
f, err := unmarshalTrunc(bs, trunc)
|
|
if err != nil {
|
|
l.Debugln("unmarshal error:", err)
|
|
return nil, false
|
|
}
|
|
return f, true
|
|
}
|
|
|
|
func (t readOnlyTransaction) getGlobal(keyBuf, folder, file []byte, truncate bool) ([]byte, FileIntf, bool) {
|
|
keyBuf = t.keyer.GenerateGlobalVersionKey(keyBuf, folder, file)
|
|
|
|
bs, err := t.Get(keyBuf, nil)
|
|
if err != nil {
|
|
return keyBuf, nil, false
|
|
}
|
|
|
|
vl, ok := unmarshalVersionList(bs)
|
|
if !ok {
|
|
return keyBuf, nil, false
|
|
}
|
|
|
|
keyBuf = t.keyer.GenerateDeviceFileKey(keyBuf, folder, vl.Versions[0].Device, file)
|
|
if fi, ok := t.getFileTrunc(keyBuf, truncate); ok {
|
|
return keyBuf, fi, true
|
|
}
|
|
|
|
return keyBuf, nil, false
|
|
}
|
|
|
|
// 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 {
|
|
readOnlyTransaction
|
|
*batch
|
|
}
|
|
|
|
func (db *instance) newReadWriteTransaction() readWriteTransaction {
|
|
return readWriteTransaction{
|
|
readOnlyTransaction: db.newReadOnlyTransaction(),
|
|
batch: db.newBatch(),
|
|
}
|
|
}
|
|
|
|
func (t readWriteTransaction) close() {
|
|
t.flush()
|
|
t.readOnlyTransaction.close()
|
|
}
|
|
|
|
// 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, bool) {
|
|
l.Debugf("update global; folder=%q device=%v file=%q version=%v invalid=%v", folder, protocol.DeviceIDFromBytes(device), file.Name, file.Version, file.IsInvalid())
|
|
|
|
var fl VersionList
|
|
if svl, err := t.Get(gk, nil); err == nil {
|
|
fl.Unmarshal(svl) // Ignore error, continue with empty fl
|
|
}
|
|
fl, removedFV, removedAt, insertedAt := fl.update(folder, device, file, t.readOnlyTransaction)
|
|
if insertedAt == -1 {
|
|
l.Debugln("update global; same version, global unchanged")
|
|
return keyBuf, false
|
|
}
|
|
|
|
name := []byte(file.Name)
|
|
|
|
var global protocol.FileInfo
|
|
if insertedAt == 0 {
|
|
// Inserted a new newest version
|
|
global = file
|
|
} else {
|
|
keyBuf = t.keyer.GenerateDeviceFileKey(keyBuf, folder, fl.Versions[0].Device, name)
|
|
if new, ok := t.getFileByKey(keyBuf); ok {
|
|
global = new
|
|
} else {
|
|
panic("This file must exist in the db")
|
|
}
|
|
}
|
|
|
|
// Fixup the list of files we need.
|
|
keyBuf = t.updateLocalNeed(keyBuf, folder, name, fl, global)
|
|
|
|
if removedAt != 0 && insertedAt != 0 {
|
|
l.Debugf(`new global for "%v" after update: %v`, file.Name, fl)
|
|
t.Put(gk, mustMarshal(&fl))
|
|
return keyBuf, true
|
|
}
|
|
|
|
// Remove the old global from the global size counter
|
|
var oldGlobalFV FileVersion
|
|
if removedAt == 0 {
|
|
oldGlobalFV = removedFV
|
|
} else if len(fl.Versions) > 1 {
|
|
// The previous newest version is now at index 1
|
|
oldGlobalFV = fl.Versions[1]
|
|
}
|
|
keyBuf = t.keyer.GenerateDeviceFileKey(keyBuf, folder, oldGlobalFV.Device, name)
|
|
if oldFile, ok := t.getFileByKey(keyBuf); ok {
|
|
// A failure to get the file here is surprising and our
|
|
// global size data will be incorrect until a restart...
|
|
meta.removeFile(protocol.GlobalDeviceID, oldFile)
|
|
}
|
|
|
|
// Add the new global to the global size counter
|
|
meta.addFile(protocol.GlobalDeviceID, global)
|
|
|
|
l.Debugf(`new global for "%v" after update: %v`, file.Name, fl)
|
|
t.Put(gk, mustMarshal(&fl))
|
|
|
|
return keyBuf, true
|
|
}
|
|
|
|
// updateLocalNeed checks whether the given file is still needed on the local
|
|
// device according to the version list and global FileInfo given and updates
|
|
// the db accordingly.
|
|
func (t readWriteTransaction) updateLocalNeed(keyBuf, folder, name []byte, fl VersionList, global protocol.FileInfo) []byte {
|
|
keyBuf = t.keyer.GenerateNeedFileKey(keyBuf, folder, name)
|
|
hasNeeded, _ := t.Has(keyBuf, nil)
|
|
if localFV, haveLocalFV := fl.Get(protocol.LocalDeviceID[:]); need(global, haveLocalFV, localFV.Version) {
|
|
if !hasNeeded {
|
|
l.Debugf("local need insert; folder=%q, name=%q", folder, name)
|
|
t.Put(keyBuf, nil)
|
|
}
|
|
} else if hasNeeded {
|
|
l.Debugf("local need delete; folder=%q, name=%q", folder, name)
|
|
t.Delete(keyBuf)
|
|
}
|
|
return keyBuf
|
|
}
|
|
|
|
func need(global FileIntf, haveLocal bool, localVersion protocol.Vector) bool {
|
|
// We never need an invalid file.
|
|
if global.IsInvalid() {
|
|
return false
|
|
}
|
|
// We don't need a deleted file if we don't have it.
|
|
if global.IsDeleted() && !haveLocal {
|
|
return false
|
|
}
|
|
// We don't need the global file if we already have the same version.
|
|
if haveLocal && localVersion.GreaterEqual(global.FileVersion()) {
|
|
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 []byte, file []byte, meta *metadataTracker) []byte {
|
|
l.Debugf("remove from global; folder=%q device=%v file=%q", folder, protocol.DeviceIDFromBytes(device), file)
|
|
|
|
svl, err := t.Get(gk, nil)
|
|
if err != nil {
|
|
// 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
|
|
}
|
|
|
|
var fl VersionList
|
|
err = fl.Unmarshal(svl)
|
|
if err != nil {
|
|
l.Debugln("unmarshal error:", err)
|
|
return keyBuf
|
|
}
|
|
|
|
fl, _, removedAt := fl.pop(device)
|
|
if removedAt == -1 {
|
|
// There is no version for the given device
|
|
return keyBuf
|
|
}
|
|
|
|
if removedAt == 0 {
|
|
// A failure to get the file here is surprising and our
|
|
// global size data will be incorrect until a restart...
|
|
keyBuf = t.keyer.GenerateDeviceFileKey(keyBuf, folder, device, file)
|
|
if f, ok := t.getFileByKey(keyBuf); ok {
|
|
meta.removeFile(protocol.GlobalDeviceID, f)
|
|
}
|
|
}
|
|
|
|
if len(fl.Versions) == 0 {
|
|
keyBuf = t.keyer.GenerateNeedFileKey(keyBuf, folder, file)
|
|
t.Delete(keyBuf)
|
|
t.Delete(gk)
|
|
return keyBuf
|
|
}
|
|
|
|
if removedAt == 0 {
|
|
keyBuf = t.keyer.GenerateDeviceFileKey(keyBuf, folder, fl.Versions[0].Device, file)
|
|
global, ok := t.getFileByKey(keyBuf)
|
|
if !ok {
|
|
panic("This file must exist in the db")
|
|
}
|
|
keyBuf = t.updateLocalNeed(keyBuf, folder, file, fl, global)
|
|
meta.addFile(protocol.GlobalDeviceID, global)
|
|
}
|
|
|
|
l.Debugf("new global after remove: %v", fl)
|
|
t.Put(gk, mustMarshal(&fl))
|
|
|
|
return keyBuf
|
|
}
|
|
|
|
func (t readWriteTransaction) deleteKeyPrefix(prefix []byte) {
|
|
dbi := t.NewIterator(util.BytesPrefix(prefix), nil)
|
|
for dbi.Next() {
|
|
t.Delete(dbi.Key())
|
|
t.checkFlush()
|
|
}
|
|
dbi.Release()
|
|
}
|
|
|
|
type marshaller interface {
|
|
Marshal() ([]byte, error)
|
|
}
|
|
|
|
func mustMarshal(f marshaller) []byte {
|
|
bs, err := f.Marshal()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return bs
|
|
}
|