mirror of
https://github.com/octoleo/syncthing.git
synced 2024-11-09 23:00:58 +00:00
277 lines
7.9 KiB
Go
277 lines
7.9 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at http://mozilla.org/MPL/2.0/.
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// Package db provides a set type to track local/remote files with newness
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// checks. We must do a certain amount of normalization in here. We will get
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// fed paths with either native or wire-format separators and encodings
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// depending on who calls us. We transform paths to wire-format (NFC and
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// slashes) on the way to the database, and transform to native format
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// (varying separator and encoding) on the way back out.
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package db
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import (
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stdsync "sync"
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"github.com/syncthing/syncthing/lib/osutil"
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"github.com/syncthing/syncthing/lib/protocol"
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"github.com/syncthing/syncthing/lib/sync"
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)
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type FileSet struct {
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localVersion map[protocol.DeviceID]int64
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mutex sync.Mutex
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folder string
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db *Instance
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blockmap *BlockMap
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localSize sizeTracker
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globalSize sizeTracker
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}
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// FileIntf is the set of methods implemented by both protocol.FileInfo and
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// protocol.FileInfoTruncated.
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type FileIntf interface {
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Size() int64
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IsDeleted() bool
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IsInvalid() bool
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IsDirectory() bool
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IsSymlink() bool
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HasPermissionBits() bool
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}
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// The Iterator is called with either a protocol.FileInfo or a
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// protocol.FileInfoTruncated (depending on the method) and returns true to
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// continue iteration, false to stop.
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type Iterator func(f FileIntf) bool
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type sizeTracker struct {
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files int
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deleted int
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bytes int64
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mut stdsync.Mutex
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}
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func (s *sizeTracker) addFile(f FileIntf) {
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if f.IsInvalid() {
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return
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}
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s.mut.Lock()
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if f.IsDeleted() {
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s.deleted++
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} else {
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s.files++
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}
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s.bytes += f.Size()
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s.mut.Unlock()
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}
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func (s *sizeTracker) removeFile(f FileIntf) {
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if f.IsInvalid() {
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return
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}
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s.mut.Lock()
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if f.IsDeleted() {
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s.deleted--
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} else {
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s.files--
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}
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s.bytes -= f.Size()
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if s.deleted < 0 || s.files < 0 {
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panic("bug: removed more than added")
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}
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s.mut.Unlock()
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}
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func (s *sizeTracker) Size() (files, deleted int, bytes int64) {
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s.mut.Lock()
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defer s.mut.Unlock()
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return s.files, s.deleted, s.bytes
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}
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func NewFileSet(folder string, db *Instance) *FileSet {
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var s = FileSet{
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localVersion: make(map[protocol.DeviceID]int64),
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folder: folder,
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db: db,
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blockmap: NewBlockMap(db, db.folderIdx.ID([]byte(folder))),
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mutex: sync.NewMutex(),
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}
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s.db.checkGlobals([]byte(folder), &s.globalSize)
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var deviceID protocol.DeviceID
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s.db.withAllFolderTruncated([]byte(folder), func(device []byte, f FileInfoTruncated) bool {
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copy(deviceID[:], device)
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if f.LocalVersion > s.localVersion[deviceID] {
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s.localVersion[deviceID] = f.LocalVersion
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}
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if deviceID == protocol.LocalDeviceID {
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s.localSize.addFile(f)
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}
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return true
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})
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l.Debugf("loaded localVersion for %q: %#v", folder, s.localVersion)
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clock(s.localVersion[protocol.LocalDeviceID])
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return &s
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}
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func (s *FileSet) Replace(device protocol.DeviceID, fs []protocol.FileInfo) {
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l.Debugf("%s Replace(%v, [%d])", s.folder, device, len(fs))
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normalizeFilenames(fs)
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s.mutex.Lock()
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defer s.mutex.Unlock()
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s.localVersion[device] = s.db.replace([]byte(s.folder), device[:], fs, &s.localSize, &s.globalSize)
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if len(fs) == 0 {
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// Reset the local version if all files were removed.
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s.localVersion[device] = 0
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}
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if device == protocol.LocalDeviceID {
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s.blockmap.Drop()
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s.blockmap.Add(fs)
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}
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}
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func (s *FileSet) Update(device protocol.DeviceID, fs []protocol.FileInfo) {
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l.Debugf("%s Update(%v, [%d])", s.folder, device, len(fs))
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normalizeFilenames(fs)
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s.mutex.Lock()
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defer s.mutex.Unlock()
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if device == protocol.LocalDeviceID {
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discards := make([]protocol.FileInfo, 0, len(fs))
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updates := make([]protocol.FileInfo, 0, len(fs))
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for _, newFile := range fs {
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existingFile, ok := s.db.getFile([]byte(s.folder), device[:], []byte(newFile.Name))
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if !ok || !existingFile.Version.Equal(newFile.Version) {
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discards = append(discards, existingFile)
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updates = append(updates, newFile)
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}
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}
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s.blockmap.Discard(discards)
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s.blockmap.Update(updates)
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}
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if lv := s.db.updateFiles([]byte(s.folder), device[:], fs, &s.localSize, &s.globalSize); lv > s.localVersion[device] {
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s.localVersion[device] = lv
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}
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}
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func (s *FileSet) WithNeed(device protocol.DeviceID, fn Iterator) {
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l.Debugf("%s WithNeed(%v)", s.folder, device)
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s.db.withNeed([]byte(s.folder), device[:], false, nativeFileIterator(fn))
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}
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func (s *FileSet) WithNeedTruncated(device protocol.DeviceID, fn Iterator) {
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l.Debugf("%s WithNeedTruncated(%v)", s.folder, device)
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s.db.withNeed([]byte(s.folder), device[:], true, nativeFileIterator(fn))
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}
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func (s *FileSet) WithHave(device protocol.DeviceID, fn Iterator) {
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l.Debugf("%s WithHave(%v)", s.folder, device)
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s.db.withHave([]byte(s.folder), device[:], nil, false, nativeFileIterator(fn))
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}
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func (s *FileSet) WithHaveTruncated(device protocol.DeviceID, fn Iterator) {
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l.Debugf("%s WithHaveTruncated(%v)", s.folder, device)
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s.db.withHave([]byte(s.folder), device[:], nil, true, nativeFileIterator(fn))
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}
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func (s *FileSet) WithPrefixedHaveTruncated(device protocol.DeviceID, prefix string, fn Iterator) {
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l.Debugf("%s WithPrefixedHaveTruncated(%v)", s.folder, device)
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s.db.withHave([]byte(s.folder), device[:], []byte(osutil.NormalizedFilename(prefix)), true, nativeFileIterator(fn))
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}
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func (s *FileSet) WithGlobal(fn Iterator) {
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l.Debugf("%s WithGlobal()", s.folder)
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s.db.withGlobal([]byte(s.folder), nil, false, nativeFileIterator(fn))
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}
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func (s *FileSet) WithGlobalTruncated(fn Iterator) {
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l.Debugf("%s WithGlobalTruncated()", s.folder)
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s.db.withGlobal([]byte(s.folder), nil, true, nativeFileIterator(fn))
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}
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func (s *FileSet) WithPrefixedGlobalTruncated(prefix string, fn Iterator) {
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l.Debugf("%s WithPrefixedGlobalTruncated()", s.folder, prefix)
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s.db.withGlobal([]byte(s.folder), []byte(osutil.NormalizedFilename(prefix)), true, nativeFileIterator(fn))
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}
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func (s *FileSet) Get(device protocol.DeviceID, file string) (protocol.FileInfo, bool) {
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f, ok := s.db.getFile([]byte(s.folder), device[:], []byte(osutil.NormalizedFilename(file)))
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f.Name = osutil.NativeFilename(f.Name)
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return f, ok
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}
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func (s *FileSet) GetGlobal(file string) (protocol.FileInfo, bool) {
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fi, ok := s.db.getGlobal([]byte(s.folder), []byte(osutil.NormalizedFilename(file)), false)
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if !ok {
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return protocol.FileInfo{}, false
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}
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f := fi.(protocol.FileInfo)
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f.Name = osutil.NativeFilename(f.Name)
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return f, true
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}
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func (s *FileSet) GetGlobalTruncated(file string) (FileInfoTruncated, bool) {
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fi, ok := s.db.getGlobal([]byte(s.folder), []byte(osutil.NormalizedFilename(file)), true)
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if !ok {
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return FileInfoTruncated{}, false
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}
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f := fi.(FileInfoTruncated)
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f.Name = osutil.NativeFilename(f.Name)
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return f, true
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}
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func (s *FileSet) Availability(file string) []protocol.DeviceID {
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return s.db.availability([]byte(s.folder), []byte(osutil.NormalizedFilename(file)))
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}
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func (s *FileSet) LocalVersion(device protocol.DeviceID) int64 {
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s.mutex.Lock()
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defer s.mutex.Unlock()
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return s.localVersion[device]
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}
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func (s *FileSet) LocalSize() (files, deleted int, bytes int64) {
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return s.localSize.Size()
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}
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func (s *FileSet) GlobalSize() (files, deleted int, bytes int64) {
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return s.globalSize.Size()
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}
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// DropFolder clears out all information related to the given folder from the
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// database.
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func DropFolder(db *Instance, folder string) {
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db.dropFolder([]byte(folder))
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bm := &BlockMap{
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db: db,
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folder: db.folderIdx.ID([]byte(folder)),
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}
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bm.Drop()
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NewVirtualMtimeRepo(db, folder).Drop()
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}
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func normalizeFilenames(fs []protocol.FileInfo) {
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for i := range fs {
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fs[i].Name = osutil.NormalizedFilename(fs[i].Name)
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}
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}
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func nativeFileIterator(fn Iterator) Iterator {
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return func(fi FileIntf) bool {
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switch f := fi.(type) {
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case protocol.FileInfo:
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f.Name = osutil.NativeFilename(f.Name)
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return fn(f)
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case FileInfoTruncated:
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f.Name = osutil.NativeFilename(f.Name)
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return fn(f)
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default:
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panic("unknown interface type")
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}
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}
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}
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