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