mirror of
https://github.com/octoleo/syncthing.git
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9c6cb0f630
Add a random perturbation to the scan interval (fixes #1150)
87 lines
2.0 KiB
Go
87 lines
2.0 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This program is free software: you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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// more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program. If not, see <http://www.gnu.org/licenses/>.
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package model
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import (
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"fmt"
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"math/rand"
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"time"
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)
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type Scanner struct {
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folder string
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intv time.Duration
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model *Model
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stop chan struct{}
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}
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func (s *Scanner) Serve() {
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if debug {
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l.Debugln(s, "starting")
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defer l.Debugln(s, "exiting")
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}
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timer := time.NewTimer(time.Millisecond)
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defer timer.Stop()
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initialScanCompleted := false
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for {
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select {
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case <-s.stop:
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return
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case <-timer.C:
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if debug {
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l.Debugln(s, "rescan")
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}
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s.model.setState(s.folder, FolderScanning)
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if err := s.model.ScanFolder(s.folder); err != nil {
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s.model.cfg.InvalidateFolder(s.folder, err.Error())
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return
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}
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s.model.setState(s.folder, FolderIdle)
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if !initialScanCompleted {
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l.Infoln("Completed initial scan (ro) of folder", s.folder)
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initialScanCompleted = true
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}
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if s.intv == 0 {
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return
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}
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// Sleep a random time between 3/4 and 5/4 of the configured interval.
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sleepNanos := (s.intv.Nanoseconds()*3 + rand.Int63n(2*s.intv.Nanoseconds())) / 4
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timer.Reset(time.Duration(sleepNanos) * time.Nanosecond)
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}
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}
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}
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func (s *Scanner) Stop() {
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close(s.stop)
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}
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func (s *Scanner) String() string {
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return fmt.Sprintf("scanner/%s@%p", s.folder, s)
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}
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func (s *Scanner) BringToFront(string) {}
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func (s *Scanner) Jobs() ([]string, []string) {
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return nil, nil
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}
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