syncthing/internal/stats/device.go

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// Copyright (C) 2014 Jakob Borg and Contributors (see the CONTRIBUTORS file).
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//
// 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 (
"time"
"github.com/syncthing/syncthing/internal/protocol"
"github.com/syndtr/goleveldb/leveldb"
)
const (
deviceStatisticTypeLastSeen = iota
)
var deviceStatisticsTypes = []byte{
deviceStatisticTypeLastSeen,
}
type DeviceStatistics struct {
LastSeen time.Time
}
type DeviceStatisticsReference struct {
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db *leveldb.DB
device protocol.DeviceID
}
func NewDeviceStatisticsReference(db *leveldb.DB, device protocol.DeviceID) *DeviceStatisticsReference {
return &DeviceStatisticsReference{
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db: db,
device: device,
}
}
func (s *DeviceStatisticsReference) key(stat byte) []byte {
k := make([]byte, 1+1+32)
k[0] = keyTypeDeviceStatistic
k[1] = stat
copy(k[1+1:], s.device[:])
return k
}
func (s *DeviceStatisticsReference) GetLastSeen() time.Time {
value, err := s.db.Get(s.key(deviceStatisticTypeLastSeen), nil)
if err != nil {
if err != leveldb.ErrNotFound {
l.Warnln("DeviceStatisticsReference: Failed loading last seen value for", s.device, ":", err)
}
return time.Unix(0, 0)
}
rtime := time.Time{}
err = rtime.UnmarshalBinary(value)
if err != nil {
l.Warnln("DeviceStatisticsReference: Failed parsing last seen value for", s.device, ":", err)
return time.Unix(0, 0)
}
if debug {
l.Debugln("stats.DeviceStatisticsReference.GetLastSeen:", s.device, rtime)
}
return rtime
}
func (s *DeviceStatisticsReference) WasSeen() {
if debug {
l.Debugln("stats.DeviceStatisticsReference.WasSeen:", s.device)
}
value, err := time.Now().MarshalBinary()
if err != nil {
l.Warnln("DeviceStatisticsReference: Failed serializing last seen value for", s.device, ":", err)
return
}
err = s.db.Put(s.key(deviceStatisticTypeLastSeen), value, nil)
if err != nil {
l.Warnln("Failed serializing last seen value for", s.device, ":", 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 device has been removed.
func (s *DeviceStatisticsReference) Delete() error {
for _, stype := range deviceStatisticsTypes {
err := s.db.Delete(s.key(stype), nil)
if debug && err == nil {
l.Debugln("stats.DeviceStatisticsReference.Delete:", s.device, stype)
}
if err != nil && err != leveldb.ErrNotFound {
return err
}
}
return nil
}
func (s *DeviceStatisticsReference) GetStatistics() DeviceStatistics {
return DeviceStatistics{
LastSeen: s.GetLastSeen(),
}
}