syncthing/internal/stats/folder.go
2014-12-09 20:24:48 +00:00

134 lines
3.4 KiB
Go

// Copyright (C) 2014 The Syncthing Authors.
//
// 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 stats
import (
"encoding/binary"
"time"
"github.com/syndtr/goleveldb/leveldb"
)
const (
folderStatisticTypeLastFile = iota
)
var folderStatisticsTypes = []byte{
folderStatisticTypeLastFile,
}
type FolderStatistics struct {
LastFile *LastFile
}
type FolderStatisticsReference struct {
db *leveldb.DB
folder string
}
func NewFolderStatisticsReference(db *leveldb.DB, folder string) *FolderStatisticsReference {
return &FolderStatisticsReference{
db: db,
folder: folder,
}
}
func (s *FolderStatisticsReference) key(stat byte) []byte {
k := make([]byte, 1+1+64)
k[0] = keyTypeFolderStatistic
k[1] = stat
copy(k[1+1:], s.folder[:])
return k
}
func (s *FolderStatisticsReference) GetLastFile() *LastFile {
value, err := s.db.Get(s.key(folderStatisticTypeLastFile), nil)
if err != nil {
if err != leveldb.ErrNotFound {
l.Warnln("FolderStatisticsReference: Failed loading last file filename value for", s.folder, ":", err)
}
return nil
}
file := LastFile{}
err = file.UnmarshalBinary(value)
if err != nil {
l.Warnln("FolderStatisticsReference: Failed loading last file value for", s.folder, ":", err)
return nil
}
return &file
}
func (s *FolderStatisticsReference) ReceivedFile(filename string) {
f := LastFile{
Filename: filename,
At: time.Now(),
}
if debug {
l.Debugln("stats.FolderStatisticsReference.ReceivedFile:", s.folder)
}
value, err := f.MarshalBinary()
if err != nil {
l.Warnln("FolderStatisticsReference: Failed serializing last file value for", s.folder, ":", err)
return
}
err = s.db.Put(s.key(folderStatisticTypeLastFile), value, nil)
if err != nil {
l.Warnln("Failed update last file value for", s.folder, ":", err)
}
}
// Never called, maybe because it's worth while to keep the data
// or maybe because we have no easy way of knowing that a folder has been removed.
func (s *FolderStatisticsReference) Delete() error {
for _, stype := range folderStatisticsTypes {
err := s.db.Delete(s.key(stype), nil)
if debug && err == nil {
l.Debugln("stats.FolderStatisticsReference.Delete:", s.folder, stype)
}
if err != nil && err != leveldb.ErrNotFound {
return err
}
}
return nil
}
func (s *FolderStatisticsReference) GetStatistics() FolderStatistics {
return FolderStatistics{
LastFile: s.GetLastFile(),
}
}
type LastFile struct {
At time.Time
Filename string
}
func (f *LastFile) MarshalBinary() ([]byte, error) {
buf := make([]byte, 8+len(f.Filename))
binary.BigEndian.PutUint64(buf[:8], uint64(f.At.Unix()))
copy(buf[8:], []byte(f.Filename))
return buf, nil
}
func (f *LastFile) UnmarshalBinary(buf []byte) error {
f.At = time.Unix(int64(binary.BigEndian.Uint64(buf[:8])), 0)
f.Filename = string(buf[8:])
return nil
}