syncthing/internal/files/set.go
2014-10-22 22:18:07 +01:00

232 lines
6.6 KiB
Go

// Copyright (C) 2014 Jakob Borg and Contributors (see the CONTRIBUTORS file).
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
// Package files provides a set type to track local/remote files with newness
// checks. We must do a certain amount of normalization in here. We will get
// fed paths with either native or wire-format separators and encodings
// depending on who calls us. We transform paths to wire-format (NFC and
// slashes) on the way to the database, and transform to native format
// (varying separator and encoding) on the way back out.
package files
import (
"sync"
"github.com/syncthing/syncthing/internal/lamport"
"github.com/syncthing/syncthing/internal/protocol"
"github.com/syndtr/goleveldb/leveldb"
)
type fileRecord struct {
File protocol.FileInfo
Usage int
Global bool
}
type bitset uint64
type Set struct {
localVersion map[protocol.DeviceID]uint64
mutex sync.Mutex
folder string
db *leveldb.DB
blockmap *BlockMap
}
func NewSet(folder string, db *leveldb.DB) *Set {
var s = Set{
localVersion: make(map[protocol.DeviceID]uint64),
folder: folder,
db: db,
blockmap: NewBlockMap(db, folder),
}
var deviceID protocol.DeviceID
ldbWithAllFolderTruncated(db, []byte(folder), func(device []byte, f protocol.FileInfoTruncated) bool {
copy(deviceID[:], device)
if f.LocalVersion > s.localVersion[deviceID] {
s.localVersion[deviceID] = f.LocalVersion
}
lamport.Default.Tick(f.Version)
return true
})
if debug {
l.Debugf("loaded localVersion for %q: %#v", folder, s.localVersion)
}
clock(s.localVersion[protocol.LocalDeviceID])
return &s
}
func (s *Set) Replace(device protocol.DeviceID, fs []protocol.FileInfo) {
if debug {
l.Debugf("%s Replace(%v, [%d])", s.folder, device, len(fs))
}
normalizeFilenames(fs)
s.mutex.Lock()
defer s.mutex.Unlock()
s.localVersion[device] = ldbReplace(s.db, []byte(s.folder), device[:], fs)
if len(fs) == 0 {
// Reset the local version if all files were removed.
s.localVersion[device] = 0
}
if device == protocol.LocalDeviceID {
s.blockmap.Drop()
s.blockmap.Add(fs)
}
}
func (s *Set) ReplaceWithDelete(device protocol.DeviceID, fs []protocol.FileInfo) {
if debug {
l.Debugf("%s ReplaceWithDelete(%v, [%d])", s.folder, device, len(fs))
}
normalizeFilenames(fs)
s.mutex.Lock()
defer s.mutex.Unlock()
if lv := ldbReplaceWithDelete(s.db, []byte(s.folder), device[:], fs); lv > s.localVersion[device] {
s.localVersion[device] = lv
}
if device == protocol.LocalDeviceID {
s.blockmap.Drop()
s.blockmap.Add(fs)
}
}
func (s *Set) Update(device protocol.DeviceID, fs []protocol.FileInfo) {
if debug {
l.Debugf("%s Update(%v, [%d])", s.folder, device, len(fs))
}
normalizeFilenames(fs)
s.mutex.Lock()
defer s.mutex.Unlock()
if device == protocol.LocalDeviceID {
discards := make([]protocol.FileInfo, 0, len(fs))
updates := make([]protocol.FileInfo, 0, len(fs))
for _, newFile := range fs {
existingFile := ldbGet(s.db, []byte(s.folder), device[:], []byte(newFile.Name))
if existingFile.Version <= newFile.Version {
discards = append(discards, existingFile)
updates = append(updates, newFile)
}
}
s.blockmap.Discard(discards)
s.blockmap.Update(updates)
}
if lv := ldbUpdate(s.db, []byte(s.folder), device[:], fs); lv > s.localVersion[device] {
s.localVersion[device] = lv
}
}
func (s *Set) WithNeed(device protocol.DeviceID, fn fileIterator) {
if debug {
l.Debugf("%s WithNeed(%v)", s.folder, device)
}
ldbWithNeed(s.db, []byte(s.folder), device[:], false, nativeFileIterator(fn))
}
func (s *Set) WithNeedTruncated(device protocol.DeviceID, fn fileIterator) {
if debug {
l.Debugf("%s WithNeedTruncated(%v)", s.folder, device)
}
ldbWithNeed(s.db, []byte(s.folder), device[:], true, nativeFileIterator(fn))
}
func (s *Set) WithHave(device protocol.DeviceID, fn fileIterator) {
if debug {
l.Debugf("%s WithHave(%v)", s.folder, device)
}
ldbWithHave(s.db, []byte(s.folder), device[:], false, nativeFileIterator(fn))
}
func (s *Set) WithHaveTruncated(device protocol.DeviceID, fn fileIterator) {
if debug {
l.Debugf("%s WithHaveTruncated(%v)", s.folder, device)
}
ldbWithHave(s.db, []byte(s.folder), device[:], true, nativeFileIterator(fn))
}
func (s *Set) WithGlobal(fn fileIterator) {
if debug {
l.Debugf("%s WithGlobal()", s.folder)
}
ldbWithGlobal(s.db, []byte(s.folder), false, nativeFileIterator(fn))
}
func (s *Set) WithGlobalTruncated(fn fileIterator) {
if debug {
l.Debugf("%s WithGlobalTruncated()", s.folder)
}
ldbWithGlobal(s.db, []byte(s.folder), true, nativeFileIterator(fn))
}
func (s *Set) Get(device protocol.DeviceID, file string) protocol.FileInfo {
f := ldbGet(s.db, []byte(s.folder), device[:], []byte(normalizedFilename(file)))
f.Name = nativeFilename(f.Name)
return f
}
func (s *Set) GetGlobal(file string) protocol.FileInfo {
f := ldbGetGlobal(s.db, []byte(s.folder), []byte(normalizedFilename(file)))
f.Name = nativeFilename(f.Name)
return f
}
func (s *Set) Availability(file string) []protocol.DeviceID {
return ldbAvailability(s.db, []byte(s.folder), []byte(normalizedFilename(file)))
}
func (s *Set) LocalVersion(device protocol.DeviceID) uint64 {
s.mutex.Lock()
defer s.mutex.Unlock()
return s.localVersion[device]
}
// ListFolders returns the folder IDs seen in the database.
func ListFolders(db *leveldb.DB) []string {
return ldbListFolders(db)
}
// DropFolder clears out all information related to the given folder from the
// database.
func DropFolder(db *leveldb.DB, folder string) {
ldbDropFolder(db, []byte(folder))
bm := &BlockMap{
db: db,
folder: folder,
}
bm.Drop()
}
func normalizeFilenames(fs []protocol.FileInfo) {
for i := range fs {
fs[i].Name = normalizedFilename(fs[i].Name)
}
}
func nativeFileIterator(fn fileIterator) fileIterator {
return func(fi protocol.FileIntf) bool {
switch f := fi.(type) {
case protocol.FileInfo:
f.Name = nativeFilename(f.Name)
return fn(f)
case protocol.FileInfoTruncated:
f.Name = nativeFilename(f.Name)
return fn(f)
default:
panic("unknown interface type")
}
}
}