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lib/db: Consistent use of buffers (#5470)

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This commit is contained in:
Simon Frei 2019-01-20 08:47:20 +01:00 committed by Jakob Borg
parent df4d754197
commit 00fa77dd47
3 changed files with 59 additions and 52 deletions
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26
lib/db/instance.go
View File

@ -34,7 +34,7 @@ func (db *instance) updateFiles(folder, device []byte, fs []protocol.FileInfo, m
t := db.newReadWriteTransaction()
defer t.close()
var dk, gk []byte
var dk, gk, keyBuf []byte
devID := protocol.DeviceIDFromBytes(device)
for _, f := range fs {
name := []byte(f.Name)
@ -53,7 +53,7 @@ func (db *instance) updateFiles(folder, device []byte, fs []protocol.FileInfo, m
t.insertFile(dk, folder, device, f)
gk = db.keyer.GenerateGlobalVersionKey(gk, folder, name)
t.updateGlobal(gk, folder, device, f, meta)
keyBuf, _ = t.updateGlobal(gk, keyBuf, folder, device, f, meta)
// Write out and reuse the batch every few records, to avoid the batch
// growing too large and thus allocating unnecessarily much memory.
@ -156,7 +156,7 @@ func (db *instance) withAllFolderTruncated(folder []byte, fn func(device []byte,
dbi := t.NewIterator(util.BytesPrefix(db.keyer.GenerateDeviceFileKey(nil, folder, nil, nil).WithoutNameAndDevice()), nil)
defer dbi.Release()
var gk []byte
var gk, buf []byte
for dbi.Next() {
device, ok := db.keyer.DeviceFromDeviceFileKey(dbi.Key())
if !ok {
@ -181,7 +181,7 @@ func (db *instance) withAllFolderTruncated(folder []byte, fn func(device []byte,
l.Infof("Dropping invalid filename %q from database", f.Name)
name := []byte(f.Name)
gk = db.keyer.GenerateGlobalVersionKey(gk, folder, name)
t.removeFromGlobal(gk, folder, device, name, nil)
buf = t.removeFromGlobal(gk, buf, folder, device, name, nil)
t.Delete(dbi.Key())
t.checkFlush()
continue
@ -202,8 +202,7 @@ func (db *instance) getFileDirty(folder, device, file []byte) (protocol.FileInfo
func (db *instance) getGlobalDirty(folder, file []byte, truncate bool) (FileIntf, bool) {
t := db.newReadOnlyTransaction()
defer t.close()
_, _, f, ok := t.getGlobalInto(nil, nil, folder, file, truncate)
_, f, ok := t.getGlobal(nil, folder, file, truncate)
return f, ok
}
@ -219,7 +218,7 @@ func (db *instance) withGlobal(folder, prefix []byte, truncate bool, fn Iterator
prefix = append(prefix, '/')
}
if _, _, f, ok := t.getGlobalInto(nil, nil, folder, unslashedPrefix, truncate); ok && !fn(f) {
if _, f, ok := t.getGlobal(nil, folder, unslashedPrefix, truncate); ok && !fn(f) {
return
}
}
@ -363,11 +362,11 @@ func (db *instance) withNeedLocal(folder []byte, truncate bool, fn Iterator) {
dbi := t.NewIterator(util.BytesPrefix(db.keyer.GenerateNeedFileKey(nil, folder, nil).WithoutName()), nil)
defer dbi.Release()
var gk, dk []byte
var buf []byte
var f FileIntf
var ok bool
for dbi.Next() {
gk, dk, f, ok = t.getGlobalInto(gk, dk, folder, db.keyer.NameFromGlobalVersionKey(dbi.Key()), truncate)
buf, f, ok = t.getGlobal(buf, folder, db.keyer.NameFromGlobalVersionKey(dbi.Key()), truncate)
if !ok {
continue
}
@ -402,13 +401,12 @@ func (db *instance) dropDeviceFolder(device, folder []byte, meta *metadataTracke
dbi := t.NewIterator(util.BytesPrefix(db.keyer.GenerateDeviceFileKey(nil, folder, device, nil)), nil)
defer dbi.Release()
var gk []byte
var gk, buf []byte
for dbi.Next() {
key := dbi.Key()
name := db.keyer.NameFromDeviceFileKey(key)
name := db.keyer.NameFromDeviceFileKey(dbi.Key())
gk = db.keyer.GenerateGlobalVersionKey(gk, folder, name)
t.removeFromGlobal(gk, folder, device, name, meta)
t.Delete(key)
buf = t.removeFromGlobal(gk, buf, folder, device, name, meta)
t.Delete(dbi.Key())
t.checkFlush()
}
}

8
lib/db/schemaupdater.go
View File

@ -101,7 +101,7 @@ func (db *schemaUpdater) updateSchema0to1() {
changedFolders := make(map[string]struct{})
ignAdded := 0
meta := newMetadataTracker() // dummy metadata tracker
var gk []byte
var gk, buf []byte
for dbi.Next() {
folder, ok := db.keyer.FolderFromDeviceFileKey(dbi.Key())
@ -126,7 +126,7 @@ func (db *schemaUpdater) updateSchema0to1() {
changedFolders[string(folder)] = struct{}{}
}
gk = db.keyer.GenerateGlobalVersionKey(gk, folder, name)
t.removeFromGlobal(gk, folder, device, nil, nil)
buf = t.removeFromGlobal(gk, buf, folder, device, nil, nil)
t.Delete(dbi.Key())
t.checkFlush()
continue
@ -156,8 +156,8 @@ func (db *schemaUpdater) updateSchema0to1() {
// Add invalid files to global list
if f.IsInvalid() {
gk = db.keyer.GenerateGlobalVersionKey(gk, folder, name)
if t.updateGlobal(gk, folder, device, f, meta) {
if _, ok := changedFolders[string(folder)]; !ok {
if buf, ok = t.updateGlobal(gk, buf, folder, device, f, meta); ok {
if _, ok = changedFolders[string(folder)]; !ok {
changedFolders[string(folder)] = struct{}{}
}
ignAdded++

77
lib/db/transactions.go
View File

@ -56,7 +56,6 @@ func (t readOnlyTransaction) getFileTrunc(key []byte, trunc bool) (FileIntf, boo
l.Debugln("surprise error:", err)
return nil, false
}
f, err := unmarshalTrunc(bs, trunc)
if err != nil {
l.Debugln("unmarshal error:", err)
@ -65,25 +64,25 @@ func (t readOnlyTransaction) getFileTrunc(key []byte, trunc bool) (FileIntf, boo
return f, true
}
func (t readOnlyTransaction) getGlobalInto(gk, dk, folder, file []byte, truncate bool) ([]byte, []byte, FileIntf, bool) {
gk = t.db.keyer.GenerateGlobalVersionKey(gk, folder, file)
func (t readOnlyTransaction) getGlobal(keyBuf, folder, file []byte, truncate bool) ([]byte, FileIntf, bool) {
keyBuf = t.db.keyer.GenerateGlobalVersionKey(keyBuf, folder, file)
bs, err := t.Get(gk, nil)
bs, err := t.Get(keyBuf, nil)
if err != nil {
return gk, dk, nil, false
return keyBuf, nil, false
}
vl, ok := unmarshalVersionList(bs)
if !ok {
return gk, dk, nil, false
return keyBuf, nil, false
}
dk = t.db.keyer.GenerateDeviceFileKey(dk, folder, vl.Versions[0].Device, file)
if fi, ok := t.getFileTrunc(dk, truncate); ok {
return gk, dk, fi, true
keyBuf = t.db.keyer.GenerateDeviceFileKey(keyBuf, folder, vl.Versions[0].Device, file)
if fi, ok := t.getFileTrunc(keyBuf, truncate); ok {
return keyBuf, fi, true
}
return gk, dk, nil, false
return keyBuf, nil, false
}
// A readWriteTransaction is a readOnlyTransaction plus a batch for writes.
@ -129,7 +128,7 @@ func (t readWriteTransaction) insertFile(fk, folder, device []byte, file protoco
// 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, folder, device []byte, file protocol.FileInfo, meta *metadataTracker) bool {
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
@ -139,7 +138,7 @@ func (t readWriteTransaction) updateGlobal(gk, folder, device []byte, file proto
fl, removedFV, removedAt, insertedAt := fl.update(folder, device, file, t.readOnlyTransaction)
if insertedAt == -1 {
l.Debugln("update global; same version, global unchanged")
return false
return keyBuf, false
}
name := []byte(file.Name)
@ -148,19 +147,22 @@ func (t readWriteTransaction) updateGlobal(gk, folder, device []byte, file proto
if insertedAt == 0 {
// Inserted a new newest version
global = file
} else if new, ok := t.getFile(folder, fl.Versions[0].Device, name); ok {
global = new
} else {
panic("This file must exist in the db")
keyBuf = t.db.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.
t.updateLocalNeed(folder, name, fl, global)
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 true
return keyBuf, true
}
// Remove the old global from the global size counter
@ -171,7 +173,8 @@ func (t readWriteTransaction) updateGlobal(gk, folder, device []byte, file proto
// The previous newest version is now at index 1
oldGlobalFV = fl.Versions[1]
}
if oldFile, ok := t.getFile(folder, oldGlobalFV.Device, name); ok {
keyBuf = t.db.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)
@ -183,24 +186,25 @@ func (t readWriteTransaction) updateGlobal(gk, folder, device []byte, file proto
l.Debugf(`new global for "%v" after update: %v`, file.Name, fl)
t.Put(gk, mustMarshal(&fl))
return true
return keyBuf, true
}
// updateLocalNeeds checks whether the given file is still needed on the local
// 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(folder, name []byte, fl VersionList, global protocol.FileInfo) {
nk := t.db.keyer.GenerateNeedFileKey(nil, folder, name)
hasNeeded, _ := t.db.Has(nk, nil)
func (t readWriteTransaction) updateLocalNeed(keyBuf, folder, name []byte, fl VersionList, global protocol.FileInfo) []byte {
keyBuf = t.db.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(nk, nil)
t.Put(keyBuf, nil)
}
} else if hasNeeded {
l.Debugf("local need delete; folder=%q, name=%q", folder, name)
t.Delete(nk)
t.Delete(keyBuf)
}
return keyBuf
}
func need(global FileIntf, haveLocal bool, localVersion protocol.Vector) bool {
@ -222,54 +226,59 @@ func need(global FileIntf, haveLocal bool, localVersion protocol.Vector) bool {
// 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, folder, device, file []byte, meta *metadataTracker) {
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
return keyBuf
}
var fl VersionList
err = fl.Unmarshal(svl)
if err != nil {
l.Debugln("unmarshal error:", err)
return
return keyBuf
}
fl, _, removedAt := fl.pop(device)
if removedAt == -1 {
// There is no version for the given device
return
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...
if f, ok := t.getFile(folder, device, file); ok {
keyBuf = t.db.keyer.GenerateDeviceFileKey(keyBuf, folder, device, file)
if f, ok := t.getFileByKey(keyBuf); ok {
meta.removeFile(protocol.GlobalDeviceID, f)
}
}
if len(fl.Versions) == 0 {
t.Delete(t.db.keyer.GenerateNeedFileKey(nil, folder, file))
keyBuf = t.db.keyer.GenerateNeedFileKey(keyBuf, folder, file)
t.Delete(keyBuf)
t.Delete(gk)
return
return keyBuf
}
if removedAt == 0 {
global, ok := t.getFile(folder, fl.Versions[0].Device, file)
keyBuf = t.db.keyer.GenerateDeviceFileKey(keyBuf, folder, fl.Versions[0].Device, file)
global, ok := t.getFileByKey(keyBuf)
if !ok {
panic("This file must exist in the db")
}
t.updateLocalNeed(folder, file, fl, global)
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) {