We're going to need the db.Instance to keep some state, and for that to work we need the same one passed around everywhere. Hence this moves the leveldb-specific file opening stuff into the db package and exports the dbInstance type.
691 lines
18 KiB
Go
691 lines
18 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 http://mozilla.org/MPL/2.0/.
|
|
|
|
package db
|
|
|
|
import (
|
|
"bytes"
|
|
"os"
|
|
"sort"
|
|
"strings"
|
|
|
|
"github.com/syncthing/syncthing/lib/protocol"
|
|
"github.com/syndtr/goleveldb/leveldb"
|
|
"github.com/syndtr/goleveldb/leveldb/errors"
|
|
"github.com/syndtr/goleveldb/leveldb/iterator"
|
|
"github.com/syndtr/goleveldb/leveldb/opt"
|
|
"github.com/syndtr/goleveldb/leveldb/storage"
|
|
"github.com/syndtr/goleveldb/leveldb/util"
|
|
)
|
|
|
|
type deletionHandler func(t readWriteTransaction, folder, device, name []byte, dbi iterator.Iterator) int64
|
|
|
|
type Instance struct {
|
|
*leveldb.DB
|
|
}
|
|
|
|
func Open(file string) (*Instance, error) {
|
|
opts := &opt.Options{
|
|
OpenFilesCacheCapacity: 100,
|
|
WriteBuffer: 4 << 20,
|
|
}
|
|
|
|
db, err := leveldb.OpenFile(file, opts)
|
|
if leveldbIsCorrupted(err) {
|
|
db, err = leveldb.RecoverFile(file, opts)
|
|
}
|
|
if leveldbIsCorrupted(err) {
|
|
// The database is corrupted, and we've tried to recover it but it
|
|
// didn't work. At this point there isn't much to do beyond dropping
|
|
// the database and reindexing...
|
|
l.Infoln("Database corruption detected, unable to recover. Reinitializing...")
|
|
if err := os.RemoveAll(file); err != nil {
|
|
return nil, err
|
|
}
|
|
db, err = leveldb.OpenFile(file, opts)
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return newDBInstance(db), nil
|
|
}
|
|
|
|
func OpenMemory() *Instance {
|
|
db, _ := leveldb.Open(storage.NewMemStorage(), nil)
|
|
return newDBInstance(db)
|
|
}
|
|
|
|
func newDBInstance(db *leveldb.DB) *Instance {
|
|
return &Instance{
|
|
DB: db,
|
|
}
|
|
}
|
|
|
|
func (db *Instance) genericReplace(folder, device []byte, fs []protocol.FileInfo, localSize, globalSize *sizeTracker, deleteFn deletionHandler) int64 {
|
|
sort.Sort(fileList(fs)) // sort list on name, same as in the database
|
|
|
|
start := db.deviceKey(folder, device, nil) // before all folder/device files
|
|
limit := db.deviceKey(folder, device, []byte{0xff, 0xff, 0xff, 0xff}) // after all folder/device files
|
|
|
|
t := db.newReadWriteTransaction()
|
|
defer t.close()
|
|
|
|
dbi := t.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
|
|
defer dbi.Release()
|
|
|
|
moreDb := dbi.Next()
|
|
fsi := 0
|
|
var maxLocalVer int64
|
|
|
|
isLocalDevice := bytes.Equal(device, protocol.LocalDeviceID[:])
|
|
for {
|
|
var newName, oldName []byte
|
|
moreFs := fsi < len(fs)
|
|
|
|
if !moreDb && !moreFs {
|
|
break
|
|
}
|
|
|
|
if moreFs {
|
|
newName = []byte(fs[fsi].Name)
|
|
}
|
|
|
|
if moreDb {
|
|
oldName = db.deviceKeyName(dbi.Key())
|
|
}
|
|
|
|
cmp := bytes.Compare(newName, oldName)
|
|
|
|
l.Debugf("generic replace; folder=%q device=%v moreFs=%v moreDb=%v cmp=%d newName=%q oldName=%q", folder, protocol.DeviceIDFromBytes(device), moreFs, moreDb, cmp, newName, oldName)
|
|
|
|
switch {
|
|
case moreFs && (!moreDb || cmp == -1):
|
|
l.Debugln("generic replace; missing - insert")
|
|
// Database is missing this file. Insert it.
|
|
if lv := t.insertFile(folder, device, fs[fsi]); lv > maxLocalVer {
|
|
maxLocalVer = lv
|
|
}
|
|
if isLocalDevice {
|
|
localSize.addFile(fs[fsi])
|
|
}
|
|
if fs[fsi].IsInvalid() {
|
|
t.removeFromGlobal(folder, device, newName, globalSize)
|
|
} else {
|
|
t.updateGlobal(folder, device, fs[fsi], globalSize)
|
|
}
|
|
fsi++
|
|
|
|
case moreFs && moreDb && cmp == 0:
|
|
// File exists on both sides - compare versions. We might get an
|
|
// update with the same version and different flags if a device has
|
|
// marked a file as invalid, so handle that too.
|
|
l.Debugln("generic replace; exists - compare")
|
|
var ef FileInfoTruncated
|
|
ef.UnmarshalXDR(dbi.Value())
|
|
if !fs[fsi].Version.Equal(ef.Version) || fs[fsi].Flags != ef.Flags {
|
|
l.Debugln("generic replace; differs - insert")
|
|
if lv := t.insertFile(folder, device, fs[fsi]); lv > maxLocalVer {
|
|
maxLocalVer = lv
|
|
}
|
|
if isLocalDevice {
|
|
localSize.removeFile(ef)
|
|
localSize.addFile(fs[fsi])
|
|
}
|
|
if fs[fsi].IsInvalid() {
|
|
t.removeFromGlobal(folder, device, newName, globalSize)
|
|
} else {
|
|
t.updateGlobal(folder, device, fs[fsi], globalSize)
|
|
}
|
|
} else {
|
|
l.Debugln("generic replace; equal - ignore")
|
|
}
|
|
|
|
fsi++
|
|
moreDb = dbi.Next()
|
|
|
|
case moreDb && (!moreFs || cmp == 1):
|
|
l.Debugln("generic replace; exists - remove")
|
|
if lv := deleteFn(t, folder, device, oldName, dbi); lv > maxLocalVer {
|
|
maxLocalVer = lv
|
|
}
|
|
moreDb = dbi.Next()
|
|
}
|
|
|
|
// Write out and reuse the batch every few records, to avoid the batch
|
|
// growing too large and thus allocating unnecessarily much memory.
|
|
t.checkFlush()
|
|
}
|
|
|
|
return maxLocalVer
|
|
}
|
|
|
|
func (db *Instance) replace(folder, device []byte, fs []protocol.FileInfo, localSize, globalSize *sizeTracker) int64 {
|
|
// TODO: Return the remaining maxLocalVer?
|
|
return db.genericReplace(folder, device, fs, localSize, globalSize, func(t readWriteTransaction, folder, device, name []byte, dbi iterator.Iterator) int64 {
|
|
// Database has a file that we are missing. Remove it.
|
|
l.Debugf("delete; folder=%q device=%v name=%q", folder, protocol.DeviceIDFromBytes(device), name)
|
|
t.removeFromGlobal(folder, device, name, globalSize)
|
|
t.Delete(dbi.Key())
|
|
return 0
|
|
})
|
|
}
|
|
|
|
func (db *Instance) updateFiles(folder, device []byte, fs []protocol.FileInfo, localSize, globalSize *sizeTracker) int64 {
|
|
t := db.newReadWriteTransaction()
|
|
defer t.close()
|
|
|
|
var maxLocalVer int64
|
|
var fk []byte
|
|
isLocalDevice := bytes.Equal(device, protocol.LocalDeviceID[:])
|
|
for _, f := range fs {
|
|
name := []byte(f.Name)
|
|
fk = db.deviceKeyInto(fk[:cap(fk)], folder, device, name)
|
|
bs, err := t.Get(fk, nil)
|
|
if err == leveldb.ErrNotFound {
|
|
if isLocalDevice {
|
|
localSize.addFile(f)
|
|
}
|
|
|
|
if lv := t.insertFile(folder, device, f); lv > maxLocalVer {
|
|
maxLocalVer = lv
|
|
}
|
|
if f.IsInvalid() {
|
|
t.removeFromGlobal(folder, device, name, globalSize)
|
|
} else {
|
|
t.updateGlobal(folder, device, f, globalSize)
|
|
}
|
|
continue
|
|
}
|
|
|
|
var ef FileInfoTruncated
|
|
err = ef.UnmarshalXDR(bs)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
// Flags might change without the version being bumped when we set the
|
|
// invalid flag on an existing file.
|
|
if !ef.Version.Equal(f.Version) || ef.Flags != f.Flags {
|
|
if isLocalDevice {
|
|
localSize.removeFile(ef)
|
|
localSize.addFile(f)
|
|
}
|
|
|
|
if lv := t.insertFile(folder, device, f); lv > maxLocalVer {
|
|
maxLocalVer = lv
|
|
}
|
|
if f.IsInvalid() {
|
|
t.removeFromGlobal(folder, device, name, globalSize)
|
|
} else {
|
|
t.updateGlobal(folder, device, f, globalSize)
|
|
}
|
|
}
|
|
|
|
// Write out and reuse the batch every few records, to avoid the batch
|
|
// growing too large and thus allocating unnecessarily much memory.
|
|
t.checkFlush()
|
|
}
|
|
|
|
return maxLocalVer
|
|
}
|
|
|
|
func (db *Instance) withHave(folder, device []byte, truncate bool, fn Iterator) {
|
|
start := db.deviceKey(folder, device, nil) // before all folder/device files
|
|
limit := db.deviceKey(folder, device, []byte{0xff, 0xff, 0xff, 0xff}) // after all folder/device files
|
|
|
|
t := db.newReadOnlyTransaction()
|
|
defer t.close()
|
|
|
|
dbi := t.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
|
|
defer dbi.Release()
|
|
|
|
for dbi.Next() {
|
|
f, err := unmarshalTrunc(dbi.Value(), truncate)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
if cont := fn(f); !cont {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (db *Instance) withAllFolderTruncated(folder []byte, fn func(device []byte, f FileInfoTruncated) bool) {
|
|
start := db.deviceKey(folder, nil, nil) // before all folder/device files
|
|
limit := db.deviceKey(folder, protocol.LocalDeviceID[:], []byte{0xff, 0xff, 0xff, 0xff}) // after all folder/device files
|
|
|
|
t := db.newReadWriteTransaction()
|
|
defer t.close()
|
|
|
|
dbi := t.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
|
|
defer dbi.Release()
|
|
|
|
for dbi.Next() {
|
|
device := db.deviceKeyDevice(dbi.Key())
|
|
var f FileInfoTruncated
|
|
err := f.UnmarshalXDR(dbi.Value())
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
switch f.Name {
|
|
case "", ".", "..", "/": // A few obviously invalid filenames
|
|
l.Infof("Dropping invalid filename %q from database", f.Name)
|
|
t.removeFromGlobal(folder, device, nil, nil)
|
|
t.Delete(dbi.Key())
|
|
t.checkFlush()
|
|
continue
|
|
}
|
|
|
|
if cont := fn(device, f); !cont {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (db *Instance) getFile(folder, device, file []byte) (protocol.FileInfo, bool) {
|
|
return getFile(db, db.deviceKey(folder, device, file))
|
|
}
|
|
|
|
func (db *Instance) getGlobal(folder, file []byte, truncate bool) (FileIntf, bool) {
|
|
k := db.globalKey(folder, file)
|
|
|
|
t := db.newReadOnlyTransaction()
|
|
defer t.close()
|
|
|
|
bs, err := t.Get(k, nil)
|
|
if err == leveldb.ErrNotFound {
|
|
return nil, false
|
|
}
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
var vl versionList
|
|
err = vl.UnmarshalXDR(bs)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
if len(vl.versions) == 0 {
|
|
l.Debugln(k)
|
|
panic("no versions?")
|
|
}
|
|
|
|
k = db.deviceKey(folder, vl.versions[0].device, file)
|
|
bs, err = t.Get(k, nil)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
fi, err := unmarshalTrunc(bs, truncate)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return fi, true
|
|
}
|
|
|
|
func (db *Instance) withGlobal(folder, prefix []byte, truncate bool, fn Iterator) {
|
|
t := db.newReadOnlyTransaction()
|
|
defer t.close()
|
|
|
|
dbi := t.NewIterator(util.BytesPrefix(db.globalKey(folder, prefix)), nil)
|
|
defer dbi.Release()
|
|
|
|
var fk []byte
|
|
for dbi.Next() {
|
|
var vl versionList
|
|
err := vl.UnmarshalXDR(dbi.Value())
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
if len(vl.versions) == 0 {
|
|
l.Debugln(dbi.Key())
|
|
panic("no versions?")
|
|
}
|
|
name := db.globalKeyName(dbi.Key())
|
|
fk = db.deviceKeyInto(fk[:cap(fk)], folder, vl.versions[0].device, name)
|
|
bs, err := t.Get(fk, nil)
|
|
if err != nil {
|
|
l.Debugf("folder: %q (%x)", folder, folder)
|
|
l.Debugf("key: %q (%x)", dbi.Key(), dbi.Key())
|
|
l.Debugf("vl: %v", vl)
|
|
l.Debugf("vl.versions[0].device: %x", vl.versions[0].device)
|
|
l.Debugf("name: %q (%x)", name, name)
|
|
l.Debugf("fk: %q", fk)
|
|
l.Debugf("fk: %x %x %x", fk[1:1+64], fk[1+64:1+64+32], fk[1+64+32:])
|
|
panic(err)
|
|
}
|
|
|
|
f, err := unmarshalTrunc(bs, truncate)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
if cont := fn(f); !cont {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (db *Instance) availability(folder, file []byte) []protocol.DeviceID {
|
|
k := db.globalKey(folder, file)
|
|
bs, err := db.Get(k, nil)
|
|
if err == leveldb.ErrNotFound {
|
|
return nil
|
|
}
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
var vl versionList
|
|
err = vl.UnmarshalXDR(bs)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
var devices []protocol.DeviceID
|
|
for _, v := range vl.versions {
|
|
if !v.version.Equal(vl.versions[0].version) {
|
|
break
|
|
}
|
|
n := protocol.DeviceIDFromBytes(v.device)
|
|
devices = append(devices, n)
|
|
}
|
|
|
|
return devices
|
|
}
|
|
|
|
func (db *Instance) withNeed(folder, device []byte, truncate bool, fn Iterator) {
|
|
start := db.globalKey(folder, nil)
|
|
limit := db.globalKey(folder, []byte{0xff, 0xff, 0xff, 0xff})
|
|
|
|
t := db.newReadOnlyTransaction()
|
|
defer t.close()
|
|
|
|
dbi := t.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
|
|
defer dbi.Release()
|
|
|
|
var fk []byte
|
|
nextFile:
|
|
for dbi.Next() {
|
|
var vl versionList
|
|
err := vl.UnmarshalXDR(dbi.Value())
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
if len(vl.versions) == 0 {
|
|
l.Debugln(dbi.Key())
|
|
panic("no versions?")
|
|
}
|
|
|
|
have := false // If we have the file, any version
|
|
need := false // If we have a lower version of the file
|
|
var haveVersion protocol.Vector
|
|
for _, v := range vl.versions {
|
|
if bytes.Compare(v.device, device) == 0 {
|
|
have = true
|
|
haveVersion = v.version
|
|
// XXX: This marks Concurrent (i.e. conflicting) changes as
|
|
// needs. Maybe we should do that, but it needs special
|
|
// handling in the puller.
|
|
need = !v.version.GreaterEqual(vl.versions[0].version)
|
|
break
|
|
}
|
|
}
|
|
|
|
if need || !have {
|
|
name := db.globalKeyName(dbi.Key())
|
|
needVersion := vl.versions[0].version
|
|
|
|
nextVersion:
|
|
for i := range vl.versions {
|
|
if !vl.versions[i].version.Equal(needVersion) {
|
|
// We haven't found a valid copy of the file with the needed version.
|
|
continue nextFile
|
|
}
|
|
fk = db.deviceKeyInto(fk[:cap(fk)], folder, vl.versions[i].device, name)
|
|
bs, err := t.Get(fk, nil)
|
|
if err != nil {
|
|
var id protocol.DeviceID
|
|
copy(id[:], device)
|
|
l.Debugf("device: %v", id)
|
|
l.Debugf("need: %v, have: %v", need, have)
|
|
l.Debugf("key: %q (%x)", dbi.Key(), dbi.Key())
|
|
l.Debugf("vl: %v", vl)
|
|
l.Debugf("i: %v", i)
|
|
l.Debugf("fk: %q (%x)", fk, fk)
|
|
l.Debugf("name: %q (%x)", name, name)
|
|
panic(err)
|
|
}
|
|
|
|
gf, err := unmarshalTrunc(bs, truncate)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
if gf.IsInvalid() {
|
|
// The file is marked invalid for whatever reason, don't use it.
|
|
continue nextVersion
|
|
}
|
|
|
|
if gf.IsDeleted() && !have {
|
|
// We don't need deleted files that we don't have
|
|
continue nextFile
|
|
}
|
|
|
|
l.Debugf("need folder=%q device=%v name=%q need=%v have=%v haveV=%d globalV=%d", folder, protocol.DeviceIDFromBytes(device), name, need, have, haveVersion, vl.versions[0].version)
|
|
|
|
if cont := fn(gf); !cont {
|
|
return
|
|
}
|
|
|
|
// This file is handled, no need to look further in the version list
|
|
continue nextFile
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (db *Instance) ListFolders() []string {
|
|
t := db.newReadOnlyTransaction()
|
|
defer t.close()
|
|
|
|
dbi := t.NewIterator(util.BytesPrefix([]byte{KeyTypeGlobal}), nil)
|
|
defer dbi.Release()
|
|
|
|
folderExists := make(map[string]bool)
|
|
for dbi.Next() {
|
|
folder := string(db.globalKeyFolder(dbi.Key()))
|
|
if !folderExists[folder] {
|
|
folderExists[folder] = true
|
|
}
|
|
}
|
|
|
|
folders := make([]string, 0, len(folderExists))
|
|
for k := range folderExists {
|
|
folders = append(folders, k)
|
|
}
|
|
|
|
sort.Strings(folders)
|
|
return folders
|
|
}
|
|
|
|
func (db *Instance) dropFolder(folder []byte) {
|
|
t := db.newReadOnlyTransaction()
|
|
defer t.close()
|
|
|
|
// Remove all items related to the given folder from the device->file bucket
|
|
dbi := t.NewIterator(util.BytesPrefix([]byte{KeyTypeDevice}), nil)
|
|
for dbi.Next() {
|
|
itemFolder := db.deviceKeyFolder(dbi.Key())
|
|
if bytes.Compare(folder, itemFolder) == 0 {
|
|
db.Delete(dbi.Key(), nil)
|
|
}
|
|
}
|
|
dbi.Release()
|
|
|
|
// Remove all items related to the given folder from the global bucket
|
|
dbi = t.NewIterator(util.BytesPrefix([]byte{KeyTypeGlobal}), nil)
|
|
for dbi.Next() {
|
|
itemFolder := db.globalKeyFolder(dbi.Key())
|
|
if bytes.Compare(folder, itemFolder) == 0 {
|
|
db.Delete(dbi.Key(), nil)
|
|
}
|
|
}
|
|
dbi.Release()
|
|
}
|
|
|
|
func (db *Instance) checkGlobals(folder []byte, globalSize *sizeTracker) {
|
|
t := db.newReadWriteTransaction()
|
|
defer t.close()
|
|
|
|
start := db.globalKey(folder, nil)
|
|
limit := db.globalKey(folder, []byte{0xff, 0xff, 0xff, 0xff})
|
|
dbi := t.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
|
|
defer dbi.Release()
|
|
|
|
var fk []byte
|
|
for dbi.Next() {
|
|
gk := dbi.Key()
|
|
var vl versionList
|
|
err := vl.UnmarshalXDR(dbi.Value())
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Check the global version list for consistency. An issue in previous
|
|
// versions of goleveldb could result in reordered writes so that
|
|
// there are global entries pointing to no longer existing files. Here
|
|
// we find those and clear them out.
|
|
|
|
name := db.globalKeyName(gk)
|
|
var newVL versionList
|
|
for i, version := range vl.versions {
|
|
fk = db.deviceKeyInto(fk[:cap(fk)], folder, version.device, name)
|
|
|
|
_, err := t.Get(fk, nil)
|
|
if err == leveldb.ErrNotFound {
|
|
continue
|
|
}
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
newVL.versions = append(newVL.versions, version)
|
|
|
|
if i == 0 {
|
|
fi, ok := t.getFile(folder, version.device, name)
|
|
if !ok {
|
|
panic("nonexistent global master file")
|
|
}
|
|
globalSize.addFile(fi)
|
|
}
|
|
}
|
|
|
|
if len(newVL.versions) != len(vl.versions) {
|
|
t.Put(dbi.Key(), newVL.MustMarshalXDR())
|
|
t.checkFlush()
|
|
}
|
|
}
|
|
l.Debugf("db check completed for %q", folder)
|
|
}
|
|
|
|
// deviceKey returns a byte slice encoding the following information:
|
|
// keyTypeDevice (1 byte)
|
|
// folder (64 bytes)
|
|
// device (32 bytes)
|
|
// name (variable size)
|
|
func (db *Instance) deviceKey(folder, device, file []byte) []byte {
|
|
return db.deviceKeyInto(nil, folder, device, file)
|
|
}
|
|
|
|
func (db *Instance) deviceKeyInto(k []byte, folder, device, file []byte) []byte {
|
|
reqLen := 1 + 64 + 32 + len(file)
|
|
if len(k) < reqLen {
|
|
k = make([]byte, reqLen)
|
|
}
|
|
k[0] = KeyTypeDevice
|
|
if len(folder) > 64 {
|
|
panic("folder name too long")
|
|
}
|
|
copy(k[1:], []byte(folder))
|
|
copy(k[1+64:], device[:])
|
|
copy(k[1+64+32:], []byte(file))
|
|
return k[:reqLen]
|
|
}
|
|
|
|
func (db *Instance) deviceKeyName(key []byte) []byte {
|
|
return key[1+64+32:]
|
|
}
|
|
|
|
func (db *Instance) deviceKeyFolder(key []byte) []byte {
|
|
folder := key[1 : 1+64]
|
|
izero := bytes.IndexByte(folder, 0)
|
|
if izero < 0 {
|
|
return folder
|
|
}
|
|
return folder[:izero]
|
|
}
|
|
|
|
func (db *Instance) deviceKeyDevice(key []byte) []byte {
|
|
return key[1+64 : 1+64+32]
|
|
}
|
|
|
|
// globalKey returns a byte slice encoding the following information:
|
|
// keyTypeGlobal (1 byte)
|
|
// folder (64 bytes)
|
|
// name (variable size)
|
|
func (db *Instance) globalKey(folder, file []byte) []byte {
|
|
k := make([]byte, 1+64+len(file))
|
|
k[0] = KeyTypeGlobal
|
|
if len(folder) > 64 {
|
|
panic("folder name too long")
|
|
}
|
|
copy(k[1:], []byte(folder))
|
|
copy(k[1+64:], []byte(file))
|
|
return k
|
|
}
|
|
|
|
func (db *Instance) globalKeyName(key []byte) []byte {
|
|
return key[1+64:]
|
|
}
|
|
|
|
func (db *Instance) globalKeyFolder(key []byte) []byte {
|
|
folder := key[1 : 1+64]
|
|
izero := bytes.IndexByte(folder, 0)
|
|
if izero < 0 {
|
|
return folder
|
|
}
|
|
return folder[:izero]
|
|
}
|
|
|
|
func unmarshalTrunc(bs []byte, truncate bool) (FileIntf, error) {
|
|
if truncate {
|
|
var tf FileInfoTruncated
|
|
err := tf.UnmarshalXDR(bs)
|
|
return tf, err
|
|
}
|
|
|
|
var tf protocol.FileInfo
|
|
err := tf.UnmarshalXDR(bs)
|
|
return tf, err
|
|
}
|
|
|
|
// A "better" version of leveldb's errors.IsCorrupted.
|
|
func leveldbIsCorrupted(err error) bool {
|
|
switch {
|
|
case err == nil:
|
|
return false
|
|
|
|
case errors.IsCorrupted(err):
|
|
return true
|
|
|
|
case strings.Contains(err.Error(), "corrupted"):
|
|
return true
|
|
}
|
|
|
|
return false
|
|
}
|