syncthing/lib/model/folderscanner.go

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// Copyright (C) 2016 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package model
import (
"github.com/syncthing/syncthing/lib/config"
"math/rand"
"time"
)
type rescanRequest struct {
subdirs []string
err chan error
}
// bundle all folder scan activity
type folderScanner struct {
interval time.Duration
timer *time.Timer
now chan rescanRequest
delay chan time.Duration
}
func newFolderScanner(config config.FolderConfiguration) folderScanner {
return folderScanner{
interval: time.Duration(config.RescanIntervalS) * time.Second,
timer: time.NewTimer(time.Millisecond), // The first scan should be done immediately.
now: make(chan rescanRequest),
delay: make(chan time.Duration),
}
}
func (f *folderScanner) Reschedule() {
if f.interval == 0 {
return
}
// Sleep a random time between 3/4 and 5/4 of the configured interval.
sleepNanos := (f.interval.Nanoseconds()*3 + rand.Int63n(2*f.interval.Nanoseconds())) / 4
interval := time.Duration(sleepNanos) * time.Nanosecond
l.Debugln(f, "next rescan in", interval)
f.timer.Reset(interval)
}
func (f *folderScanner) Scan(subdirs []string) error {
req := rescanRequest{
subdirs: subdirs,
err: make(chan error),
}
f.now <- req
return <-req.err
}
func (f *folderScanner) Delay(next time.Duration) {
f.delay <- next
}
func (f *folderScanner) HasNoInterval() bool {
return f.interval == 0
}