func ldbReplaceWithDelete(db *leveldb.DB, folder, device []byte, fs []protocol.FileInfo) uint64 {
return ldbGenericReplace(db, folder, device, fs, func(db dbReader, batch dbWriter, folder, device, name []byte, dbi iterator.Iterator) uint64 {
var tf protocol.FileInfoTruncated
err := tf.UnmarshalXDR(dbi.Value())
if err != nil {
panic(err)
}
if !tf.IsDeleted() {
if debugDB {
l.Debugf("mark deleted; folder=%q device=%v name=%q", folder, protocol.DeviceIDFromBytes(device), name)
}
ts := clock(tf.LocalVersion)
f := protocol.FileInfo{
Name: tf.Name,
Version: lamport.Default.Tick(tf.Version),
LocalVersion: ts,
Flags: tf.Flags | protocol.FlagDeleted,
Modified: tf.Modified,
}
bs, _ := f.MarshalXDR()
if debugDB {
l.Debugf("batch.Put %p %x", batch, dbi.Key())
}
batch.Put(dbi.Key(), bs)
ldbUpdateGlobal(db, batch, folder, device, deviceKeyName(dbi.Key()), f.Version)
return ts
}
return 0
})
}
func ldbAvailability(db *leveldb.DB, folder, file []byte) []protocol.DeviceID {
k := 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 != vl.versions[0].version {
break
}
n := protocol.DeviceIDFromBytes(v.device)
devices = append(devices, n)
}
return devices
}
// ldbRemoveFromGlobal 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 ldbRemoveFromGlobal(db dbReader, batch dbWriter, folder, device, file []byte) {
if debug {
l.Debugf("remove from global; folder=%q device=%v file=%q", folder, protocol.DeviceIDFromBytes(device), file)
}
gk := globalKey(folder, file)
svl, err := db.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
}
var fl versionList
err = fl.UnmarshalXDR(svl)
if err != nil {
panic(err)
}
for i := range fl.versions {
if bytes.Compare(fl.versions[i].device, device) == 0 {
fl.versions = append(fl.versions[:i], fl.versions[i+1:]...)
break
}
}
if len(fl.versions) == 0 {
batch.Delete(gk)
} else {
batch.Put(gk, fl.MarshalXDR())
}
}
// ldbUpdateGlobal 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 ldbUpdateGlobal(db dbReader, batch dbWriter, folder, device, file []byte, version uint64) bool {
if debugDB {
l.Debugf("update global; folder=%q device=%v file=%q version=%d", folder, protocol.DeviceIDFromBytes(device), file, version)
}
gk := globalKey(folder, file)
svl, err := db.Get(gk, nil)
if err != nil && err != leveldb.ErrNotFound {
panic(err)
}
var fl versionList
nv := fileVersion{
device: device,
version: version,
}
if svl != nil {
err = fl.UnmarshalXDR(svl)
if err != nil {
panic(err)
}
for i := range fl.versions {
if bytes.Compare(fl.versions[i].device, device) == 0 {
if fl.versions[i].version == version {
// No need to do anything
return false
}
fl.versions = append(fl.versions[:i], fl.versions[i+1:]...)
break
}
}
}
for i := range fl.versions {
if fl.versions[i].version <= version {
t := append(fl.versions, fileVersion{})
copy(t[i+1:], t[i:])
t[i] = nv
fl.versions = t
goto done
}
}
fl.versions = append(fl.versions, nv)
done:
if debugDB {
l.Debugf("batch.Put %p %x", batch, gk)
l.Debugf("new global after update: %v", fl)
}
batch.Put(gk, fl.MustMarshalXDR())
return true
}
func ldbReplace(db *leveldb.DB, folder, device []byte, fs []protocol.FileInfo) uint64 {
// TODO: Return the remaining maxLocalVer?
return ldbGenericReplace(db, folder, device, fs, func(db dbReader, batch dbWriter, folder, device, name []byte, dbi iterator.Iterator) uint64 {
// Disk has files that we are missing. Remove it.
if debug {
l.Debugf("delete; folder=%q device=%v name=%q", folder, protocol.DeviceIDFromBytes(device), name)
}
ldbRemoveFromGlobal(db, batch, folder, device, name)
batch.Delete(dbi.Key())
return 0
})
}
func ldbInsert(batch dbWriter, folder, device, name []byte, file protocol.FileInfo) uint64 {
if debug {
l.Debugf("insert; folder=%q device=%v %v", folder, protocol.DeviceIDFromBytes(device), file)
}
if file.LocalVersion == 0 {
file.LocalVersion = clock(0)
}
nk := deviceKey(folder, device, name)
batch.Put(nk, file.MarshalXDR())
return file.LocalVersion
}
func ldbWithNeed(db *leveldb.DB, folder, device []byte, truncate bool, fn fileIterator) {
runtime.GC()
start := globalKey(folder, nil)
limit := globalKey(folder, []byte{0xff, 0xff, 0xff, 0xff})
snap, err := db.GetSnapshot()
if err != nil {
panic(err)
}
if debugDB {
l.Debugf("created snapshot %p", snap)
}
defer func() {
if debugDB {
l.Debugf("close snapshot %p", snap)
}
snap.Release()
}()
dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
defer dbi.Release()
outer:
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 uint64
for _, v := range vl.versions {
if bytes.Compare(v.device, device) == 0 {
have = true
haveVersion = v.version
need = v.version < vl.versions[0].version
break
}
}
if need || !have {
name := globalKeyName(dbi.Key())
needVersion := vl.versions[0].version
inner:
for i := range vl.versions {
if vl.versions[i].version != needVersion {
// We haven't found a valid copy of the file with the needed version.
continue outer
}
fk := deviceKey(folder, vl.versions[i].device, name)
if debugDB {
l.Debugf("snap.Get %p %x", snap, fk)
}
bs, err := snap.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 inner
}
if gf.IsDeleted() && !have {
// We don't need deleted files that we don't have
continue outer
}
if debugDB {
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 outer
}
}
}
}
func ldbGenericReplace(db *leveldb.DB, folder, device []byte, fs []protocol.FileInfo, deleteFn deletionHandler) uint64 {
runtime.GC()
sort.Sort(fileList(fs)) // sort list on name, same as in the database
start := deviceKey(folder, device, nil) // before all folder/device files
limit := deviceKey(folder, device, []byte{0xff, 0xff, 0xff, 0xff}) // after all folder/device files
batch := new(leveldb.Batch)
if debugDB {
l.Debugf("new batch %p", batch)
}
snap, err := db.GetSnapshot()
if err != nil {
panic(err)
}
if debugDB {
l.Debugf("created snapshot %p", snap)
}
defer func() {
if debugDB {
l.Debugf("close snapshot %p", snap)
}
snap.Release()
}()
dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
defer dbi.Release()
moreDb := dbi.Next()
fsi := 0
var maxLocalVer uint64
for {
var newName, oldName []byte
moreFs := fsi < len(fs)
if !moreDb && !moreFs {
break
}
if moreFs {
newName = []byte(fs[fsi].Name)
}
if moreDb {
oldName = deviceKeyName(dbi.Key())
}
cmp := bytes.Compare(newName, oldName)
if debugDB {
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):
if debugDB {
l.Debugln("generic replace; missing - insert")
}
// Database is missing this file. Insert it.
if lv := ldbInsert(batch, folder, device, fs[fsi]); lv > maxLocalVer {
maxLocalVer = lv
}
if fs[fsi].IsInvalid() {
ldbRemoveFromGlobal(snap, batch, folder, device, newName)
} else {
ldbUpdateGlobal(snap, batch, folder, device, newName, fs[fsi].Version)
}
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.
if debugDB {
l.Debugln("generic replace; exists - compare")
}
var ef protocol.FileInfoTruncated
ef.UnmarshalXDR(dbi.Value())
if fs[fsi].Version > ef.Version ||
(fs[fsi].Version == ef.Version && fs[fsi].Flags != ef.Flags) {
if debugDB {
l.Debugln("generic replace; differs - insert")
}
if lv := ldbInsert(batch, folder, device, fs[fsi]); lv > maxLocalVer {
maxLocalVer = lv
}
if fs[fsi].IsInvalid() {
ldbRemoveFromGlobal(snap, batch, folder, device, newName)
} else {
ldbUpdateGlobal(snap, batch, folder, device, newName, fs[fsi].Version)
}
} else if debugDB {
l.Debugln("generic replace; equal - ignore")
}
fsi++
moreDb = dbi.Next()
case moreDb && (!moreFs || cmp == 1):
if debugDB {
l.Debugln("generic replace; exists - remove")
}
if lv := deleteFn(snap, batch, folder, device, oldName, dbi); lv > maxLocalVer {
maxLocalVer = lv
}
moreDb = dbi.Next()
}
}
if debugDB {
l.Debugf("db.Write %p", batch)
}
err = db.Write(batch, nil)
if err != nil {
panic(err)
}
return maxLocalVer
}
