721 lines
16 KiB
Go
721 lines
16 KiB
Go
package files
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import (
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"bytes"
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"runtime"
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"sort"
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"sync"
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"github.com/syncthing/syncthing/lamport"
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"github.com/syncthing/syncthing/protocol"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/iterator"
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"github.com/syndtr/goleveldb/leveldb/opt"
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"github.com/syndtr/goleveldb/leveldb/util"
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)
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var (
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clockTick uint64
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clockMut sync.Mutex
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)
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func clock(v uint64) uint64 {
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clockMut.Lock()
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defer clockMut.Unlock()
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if v > clockTick {
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clockTick = v + 1
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} else {
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clockTick++
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}
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return clockTick
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}
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const (
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keyTypeNode = iota
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keyTypeGlobal
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)
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type fileVersion struct {
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version uint64
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node []byte
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}
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type versionList struct {
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versions []fileVersion
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}
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type fileList []protocol.FileInfo
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func (l fileList) Len() int {
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return len(l)
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}
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func (l fileList) Swap(a, b int) {
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l[a], l[b] = l[b], l[a]
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}
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func (l fileList) Less(a, b int) bool {
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return l[a].Name < l[b].Name
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}
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type dbReader interface {
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Get([]byte, *opt.ReadOptions) ([]byte, error)
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}
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type dbWriter interface {
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Put([]byte, []byte)
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Delete([]byte)
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}
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/*
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keyTypeNode (1 byte)
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repository (64 bytes)
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node (32 bytes)
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name (variable size)
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scanner.File
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keyTypeGlobal (1 byte)
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repository (64 bytes)
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name (variable size)
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[]fileVersion (sorted)
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*/
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func nodeKey(repo, node, file []byte) []byte {
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k := make([]byte, 1+64+32+len(file))
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k[0] = keyTypeNode
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copy(k[1:], []byte(repo))
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copy(k[1+64:], node[:])
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copy(k[1+64+32:], []byte(file))
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return k
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}
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func globalKey(repo, file []byte) []byte {
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k := make([]byte, 1+64+len(file))
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k[0] = keyTypeGlobal
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copy(k[1:], []byte(repo))
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copy(k[1+64:], []byte(file))
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return k
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}
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func nodeKeyName(key []byte) []byte {
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return key[1+64+32:]
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}
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func nodeKeyRepo(key []byte) []byte {
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repo := key[1 : 1+64]
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izero := bytes.IndexByte(repo, 0)
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return repo[:izero]
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}
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func nodeKeyNode(key []byte) []byte {
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return key[1+64 : 1+64+32]
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}
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func globalKeyName(key []byte) []byte {
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return key[1+64:]
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}
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func globalKeyRepo(key []byte) []byte {
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repo := key[1 : 1+64]
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izero := bytes.IndexByte(repo, 0)
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return repo[:izero]
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}
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type deletionHandler func(db dbReader, batch dbWriter, repo, node, name []byte, dbi iterator.Iterator) uint64
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type fileIterator func(f protocol.FileIntf) bool
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func ldbGenericReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo, deleteFn deletionHandler) uint64 {
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defer runtime.GC()
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sort.Sort(fileList(fs)) // sort list on name, same as on disk
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start := nodeKey(repo, node, nil) // before all repo/node files
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limit := nodeKey(repo, node, []byte{0xff, 0xff, 0xff, 0xff}) // after all repo/node files
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batch := new(leveldb.Batch)
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snap, err := db.GetSnapshot()
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if err != nil {
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panic(err)
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}
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defer snap.Release()
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dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
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defer dbi.Release()
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moreDb := dbi.Next()
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fsi := 0
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var maxLocalVer uint64
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for {
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var newName, oldName []byte
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moreFs := fsi < len(fs)
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if !moreDb && !moreFs {
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break
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}
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if !moreFs && deleteFn == nil {
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// We don't have any more updated files to process and deletion
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// has not been requested, so we can exit early
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break
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}
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if moreFs {
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newName = []byte(fs[fsi].Name)
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}
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if moreDb {
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oldName = nodeKeyName(dbi.Key())
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}
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cmp := bytes.Compare(newName, oldName)
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if debug {
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l.Debugf("generic replace; repo=%q node=%v moreFs=%v moreDb=%v cmp=%d newName=%q oldName=%q", repo, protocol.NodeIDFromBytes(node), moreFs, moreDb, cmp, newName, oldName)
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}
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switch {
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case moreFs && (!moreDb || cmp == -1):
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// Disk is missing this file. Insert it.
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if lv := ldbInsert(batch, repo, node, newName, fs[fsi]); lv > maxLocalVer {
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maxLocalVer = lv
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}
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ldbUpdateGlobal(snap, batch, repo, node, newName, fs[fsi].Version)
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fsi++
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case moreFs && moreDb && cmp == 0:
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// File exists on both sides - compare versions.
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var ef protocol.FileInfoTruncated
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ef.UnmarshalXDR(dbi.Value())
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if fs[fsi].Version > ef.Version {
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if lv := ldbInsert(batch, repo, node, newName, fs[fsi]); lv > maxLocalVer {
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maxLocalVer = lv
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}
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ldbUpdateGlobal(snap, batch, repo, node, newName, fs[fsi].Version)
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}
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// Iterate both sides.
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fsi++
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moreDb = dbi.Next()
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case moreDb && (!moreFs || cmp == 1):
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if deleteFn != nil {
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if lv := deleteFn(snap, batch, repo, node, oldName, dbi); lv > maxLocalVer {
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maxLocalVer = lv
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}
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}
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moreDb = dbi.Next()
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}
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}
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err = db.Write(batch, nil)
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if err != nil {
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panic(err)
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}
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return maxLocalVer
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}
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func ldbReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) uint64 {
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// TODO: Return the remaining maxLocalVer?
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return ldbGenericReplace(db, repo, node, fs, func(db dbReader, batch dbWriter, repo, node, name []byte, dbi iterator.Iterator) uint64 {
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// Disk has files that we are missing. Remove it.
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if debug {
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l.Debugf("delete; repo=%q node=%v name=%q", repo, protocol.NodeIDFromBytes(node), name)
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}
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ldbRemoveFromGlobal(db, batch, repo, node, name)
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batch.Delete(dbi.Key())
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return 0
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})
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}
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func ldbReplaceWithDelete(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) uint64 {
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return ldbGenericReplace(db, repo, node, fs, func(db dbReader, batch dbWriter, repo, node, name []byte, dbi iterator.Iterator) uint64 {
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var tf protocol.FileInfoTruncated
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err := tf.UnmarshalXDR(dbi.Value())
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if err != nil {
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panic(err)
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}
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if !tf.IsDeleted() {
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if debug {
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l.Debugf("mark deleted; repo=%q node=%v name=%q", repo, protocol.NodeIDFromBytes(node), name)
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}
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ts := clock(tf.LocalVersion)
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f := protocol.FileInfo{
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Name: tf.Name,
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Version: lamport.Default.Tick(tf.Version),
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LocalVersion: ts,
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Flags: tf.Flags | protocol.FlagDeleted,
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Modified: tf.Modified,
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}
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batch.Put(dbi.Key(), f.MarshalXDR())
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ldbUpdateGlobal(db, batch, repo, node, nodeKeyName(dbi.Key()), f.Version)
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return ts
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}
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return 0
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})
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}
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func ldbUpdate(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) uint64 {
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defer runtime.GC()
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batch := new(leveldb.Batch)
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snap, err := db.GetSnapshot()
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if err != nil {
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panic(err)
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}
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defer snap.Release()
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var maxLocalVer uint64
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for _, f := range fs {
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name := []byte(f.Name)
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fk := nodeKey(repo, node, name)
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bs, err := snap.Get(fk, nil)
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if err == leveldb.ErrNotFound {
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if lv := ldbInsert(batch, repo, node, name, f); lv > maxLocalVer {
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maxLocalVer = lv
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}
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ldbUpdateGlobal(snap, batch, repo, node, name, f.Version)
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continue
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}
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var ef protocol.FileInfoTruncated
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err = ef.UnmarshalXDR(bs)
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if err != nil {
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panic(err)
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}
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if ef.Version != f.Version {
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if lv := ldbInsert(batch, repo, node, name, f); lv > maxLocalVer {
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maxLocalVer = lv
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}
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ldbUpdateGlobal(snap, batch, repo, node, name, f.Version)
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}
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}
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err = db.Write(batch, nil)
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if err != nil {
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panic(err)
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}
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return maxLocalVer
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}
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func ldbInsert(batch dbWriter, repo, node, name []byte, file protocol.FileInfo) uint64 {
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if debug {
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l.Debugf("insert; repo=%q node=%v %v", repo, protocol.NodeIDFromBytes(node), file)
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}
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if file.LocalVersion == 0 {
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file.LocalVersion = clock(0)
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}
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nk := nodeKey(repo, node, name)
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batch.Put(nk, file.MarshalXDR())
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return file.LocalVersion
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}
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// ldbUpdateGlobal adds this node+version to the version list for the given
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// file. If the node is already present in the list, the version is updated.
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// If the file does not have an entry in the global list, it is created.
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func ldbUpdateGlobal(db dbReader, batch dbWriter, repo, node, file []byte, version uint64) bool {
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if debug {
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l.Debugf("update global; repo=%q node=%v file=%q version=%d", repo, protocol.NodeIDFromBytes(node), file, version)
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}
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gk := globalKey(repo, file)
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svl, err := db.Get(gk, nil)
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if err != nil && err != leveldb.ErrNotFound {
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panic(err)
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}
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|
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var fl versionList
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nv := fileVersion{
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node: node,
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version: version,
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}
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if svl != nil {
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err = fl.UnmarshalXDR(svl)
|
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if err != nil {
|
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panic(err)
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}
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|
|
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for i := range fl.versions {
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if bytes.Compare(fl.versions[i].node, node) == 0 {
|
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if fl.versions[i].version == version {
|
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// No need to do anything
|
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return false
|
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}
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fl.versions = append(fl.versions[:i], fl.versions[i+1:]...)
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break
|
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}
|
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}
|
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}
|
|
|
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for i := range fl.versions {
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if fl.versions[i].version <= version {
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t := append(fl.versions, fileVersion{})
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copy(t[i+1:], t[i:])
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t[i] = nv
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fl.versions = t
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goto done
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}
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}
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|
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fl.versions = append(fl.versions, nv)
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|
|
|
done:
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batch.Put(gk, fl.MarshalXDR())
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|
|
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return true
|
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}
|
|
|
|
// ldbRemoveFromGlobal removes the node from the global version list for the
|
|
// given file. If the version list is empty after this, the file entry is
|
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// removed entirely.
|
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func ldbRemoveFromGlobal(db dbReader, batch dbWriter, repo, node, file []byte) {
|
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if debug {
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l.Debugf("remove from global; repo=%q node=%v file=%q", repo, protocol.NodeIDFromBytes(node), file)
|
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}
|
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|
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gk := globalKey(repo, file)
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svl, err := db.Get(gk, nil)
|
|
if err != nil {
|
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panic(err)
|
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}
|
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|
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var fl versionList
|
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err = fl.UnmarshalXDR(svl)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
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for i := range fl.versions {
|
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if bytes.Compare(fl.versions[i].node, node) == 0 {
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fl.versions = append(fl.versions[:i], fl.versions[i+1:]...)
|
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break
|
|
}
|
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}
|
|
|
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if len(fl.versions) == 0 {
|
|
batch.Delete(gk)
|
|
} else {
|
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batch.Put(gk, fl.MarshalXDR())
|
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}
|
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}
|
|
|
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func ldbWithHave(db *leveldb.DB, repo, node []byte, truncate bool, fn fileIterator) {
|
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start := nodeKey(repo, node, nil) // before all repo/node files
|
|
limit := nodeKey(repo, node, []byte{0xff, 0xff, 0xff, 0xff}) // after all repo/node files
|
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snap, err := db.GetSnapshot()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
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defer snap.Release()
|
|
dbi := snap.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 ldbWithAllRepoTruncated(db *leveldb.DB, repo []byte, fn func(node []byte, f protocol.FileInfoTruncated) bool) {
|
|
defer runtime.GC()
|
|
|
|
start := nodeKey(repo, nil, nil) // before all repo/node files
|
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limit := nodeKey(repo, protocol.LocalNodeID[:], []byte{0xff, 0xff, 0xff, 0xff}) // after all repo/node files
|
|
snap, err := db.GetSnapshot()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer snap.Release()
|
|
dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
|
|
defer dbi.Release()
|
|
|
|
for dbi.Next() {
|
|
node := nodeKeyNode(dbi.Key())
|
|
var f protocol.FileInfoTruncated
|
|
err := f.UnmarshalXDR(dbi.Value())
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
if cont := fn(node, f); !cont {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func ldbGet(db *leveldb.DB, repo, node, file []byte) protocol.FileInfo {
|
|
nk := nodeKey(repo, node, file)
|
|
bs, err := db.Get(nk, nil)
|
|
if err == leveldb.ErrNotFound {
|
|
return protocol.FileInfo{}
|
|
}
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
var f protocol.FileInfo
|
|
err = f.UnmarshalXDR(bs)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return f
|
|
}
|
|
|
|
func ldbGetGlobal(db *leveldb.DB, repo, file []byte) protocol.FileInfo {
|
|
k := globalKey(repo, file)
|
|
snap, err := db.GetSnapshot()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer snap.Release()
|
|
|
|
bs, err := snap.Get(k, nil)
|
|
if err == leveldb.ErrNotFound {
|
|
return protocol.FileInfo{}
|
|
}
|
|
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 = nodeKey(repo, vl.versions[0].node, file)
|
|
bs, err = snap.Get(k, nil)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
var f protocol.FileInfo
|
|
err = f.UnmarshalXDR(bs)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return f
|
|
}
|
|
|
|
func ldbWithGlobal(db *leveldb.DB, repo []byte, truncate bool, fn fileIterator) {
|
|
defer runtime.GC()
|
|
|
|
start := globalKey(repo, nil)
|
|
limit := globalKey(repo, []byte{0xff, 0xff, 0xff, 0xff})
|
|
snap, err := db.GetSnapshot()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer snap.Release()
|
|
dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
|
|
defer dbi.Release()
|
|
|
|
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?")
|
|
}
|
|
fk := nodeKey(repo, vl.versions[0].node, globalKeyName(dbi.Key()))
|
|
bs, err := snap.Get(fk, nil)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
f, err := unmarshalTrunc(bs, truncate)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
if cont := fn(f); !cont {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func ldbAvailability(db *leveldb.DB, repo, file []byte) []protocol.NodeID {
|
|
k := globalKey(repo, 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 nodes []protocol.NodeID
|
|
for _, v := range vl.versions {
|
|
if v.version != vl.versions[0].version {
|
|
break
|
|
}
|
|
n := protocol.NodeIDFromBytes(v.node)
|
|
nodes = append(nodes, n)
|
|
}
|
|
|
|
return nodes
|
|
}
|
|
|
|
func ldbWithNeed(db *leveldb.DB, repo, node []byte, truncate bool, fn fileIterator) {
|
|
defer runtime.GC()
|
|
|
|
start := globalKey(repo, nil)
|
|
limit := globalKey(repo, []byte{0xff, 0xff, 0xff, 0xff})
|
|
snap, err := db.GetSnapshot()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer snap.Release()
|
|
dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
|
|
defer dbi.Release()
|
|
|
|
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.node, node) == 0 {
|
|
have = true
|
|
haveVersion = v.version
|
|
need = v.version < vl.versions[0].version
|
|
break
|
|
}
|
|
}
|
|
|
|
if need || !have {
|
|
name := globalKeyName(dbi.Key())
|
|
fk := nodeKey(repo, vl.versions[0].node, name)
|
|
bs, err := snap.Get(fk, nil)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
gf, err := unmarshalTrunc(bs, truncate)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
if gf.IsDeleted() && !have {
|
|
// We don't need deleted files that we don't have
|
|
continue
|
|
}
|
|
|
|
if debug {
|
|
l.Debugf("need repo=%q node=%v name=%q need=%v have=%v haveV=%d globalV=%d", repo, protocol.NodeIDFromBytes(node), name, need, have, haveVersion, vl.versions[0].version)
|
|
}
|
|
|
|
if cont := fn(gf); !cont {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func ldbListRepos(db *leveldb.DB) []string {
|
|
defer runtime.GC()
|
|
|
|
start := []byte{keyTypeGlobal}
|
|
limit := []byte{keyTypeGlobal + 1}
|
|
snap, err := db.GetSnapshot()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer snap.Release()
|
|
dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
|
|
defer dbi.Release()
|
|
|
|
repoExists := make(map[string]bool)
|
|
for dbi.Next() {
|
|
repo := string(globalKeyRepo(dbi.Key()))
|
|
if !repoExists[repo] {
|
|
repoExists[repo] = true
|
|
}
|
|
}
|
|
|
|
repos := make([]string, 0, len(repoExists))
|
|
for k := range repoExists {
|
|
repos = append(repos, k)
|
|
}
|
|
|
|
sort.Strings(repos)
|
|
return repos
|
|
}
|
|
|
|
func ldbDropRepo(db *leveldb.DB, repo []byte) {
|
|
defer runtime.GC()
|
|
|
|
snap, err := db.GetSnapshot()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer snap.Release()
|
|
|
|
// Remove all items related to the given repo from the node->file bucket
|
|
start := []byte{keyTypeNode}
|
|
limit := []byte{keyTypeNode + 1}
|
|
dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
|
|
for dbi.Next() {
|
|
itemRepo := nodeKeyRepo(dbi.Key())
|
|
if bytes.Compare(repo, itemRepo) == 0 {
|
|
db.Delete(dbi.Key(), nil)
|
|
}
|
|
}
|
|
dbi.Release()
|
|
|
|
// Remove all items related to the given repo from the global bucket
|
|
start = []byte{keyTypeGlobal}
|
|
limit = []byte{keyTypeGlobal + 1}
|
|
dbi = snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
|
|
for dbi.Next() {
|
|
itemRepo := globalKeyRepo(dbi.Key())
|
|
if bytes.Compare(repo, itemRepo) == 0 {
|
|
db.Delete(dbi.Key(), nil)
|
|
}
|
|
}
|
|
dbi.Release()
|
|
}
|
|
|
|
func unmarshalTrunc(bs []byte, truncate bool) (protocol.FileIntf, error) {
|
|
if truncate {
|
|
var tf protocol.FileInfoTruncated
|
|
err := tf.UnmarshalXDR(bs)
|
|
return tf, err
|
|
} else {
|
|
var tf protocol.FileInfo
|
|
err := tf.UnmarshalXDR(bs)
|
|
return tf, err
|
|
}
|
|
}
|