syncthing/lib/model/folder.go
2017-11-09 21:16:29 +00:00

190 lines
4.5 KiB
Go

// Copyright (C) 2014 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 (
"context"
"time"
"github.com/syncthing/syncthing/lib/config"
"github.com/syncthing/syncthing/lib/watchaggregator"
)
type folder struct {
stateTracker
config.FolderConfiguration
scan folderScanner
model *Model
ctx context.Context
cancel context.CancelFunc
initialScanFinished chan struct{}
watchCancel context.CancelFunc
watchChan chan []string
restartWatchChan chan struct{}
}
func newFolder(model *Model, cfg config.FolderConfiguration) folder {
ctx, cancel := context.WithCancel(context.Background())
return folder{
stateTracker: newStateTracker(cfg.ID),
FolderConfiguration: cfg,
scan: newFolderScanner(cfg),
ctx: ctx,
cancel: cancel,
model: model,
initialScanFinished: make(chan struct{}),
watchCancel: func() {},
}
}
func (f *folder) BringToFront(string) {}
func (f *folder) DelayScan(next time.Duration) {
f.scan.Delay(next)
}
func (f *folder) IndexUpdated() {}
func (f *folder) IgnoresUpdated() {
if f.FSWatcherEnabled {
f.scheduleWatchRestart()
}
}
func (f *folder) SchedulePull() {}
func (f *folder) Jobs() ([]string, []string) {
return nil, nil
}
func (f *folder) Scan(subdirs []string) error {
<-f.initialScanFinished
return f.scan.Scan(subdirs)
}
func (f *folder) Stop() {
f.cancel()
}
// CheckHealth checks the folder for common errors, updates the folder state
// and returns the current folder error, or nil if the folder is healthy.
func (f *folder) CheckHealth() error {
err := f.getHealthError()
f.setError(err)
return err
}
func (f *folder) getHealthError() error {
// Check for folder errors, with the most serious and specific first and
// generic ones like out of space on the home disk later.
if err := f.CheckPath(); err != nil {
return err
}
if err := f.CheckFreeSpace(); err != nil {
return err
}
if err := f.model.cfg.CheckHomeFreeSpace(); err != nil {
return err
}
return nil
}
func (f *folder) scanSubdirs(subDirs []string) error {
if err := f.model.internalScanFolderSubdirs(f.ctx, f.folderID, subDirs); err != nil {
// Potentially sets the error twice, once in the scanner just
// by doing a check, and once here, if the error returned is
// the same one as returned by CheckHealth, though
// duplicate set is handled by setError.
f.setError(err)
return err
}
return nil
}
func (f *folder) scanTimerFired() {
err := f.scanSubdirs(nil)
select {
case <-f.initialScanFinished:
default:
status := "Completed"
if err != nil {
status = "Failed"
}
l.Infoln(status, "initial scan of", f.Type.String(), "folder", f.Description())
close(f.initialScanFinished)
}
f.scan.Reschedule()
}
func (f *folder) startWatch() {
ctx, cancel := context.WithCancel(f.ctx)
f.model.fmut.RLock()
ignores := f.model.folderIgnores[f.folderID]
f.model.fmut.RUnlock()
eventChan, err := f.Filesystem().Watch(".", ignores, ctx, f.IgnorePerms)
if err != nil {
l.Warnf("Failed to start filesystem watcher for folder %s: %v", f.Description(), err)
} else {
f.watchChan = make(chan []string)
f.watchCancel = cancel
watchaggregator.Aggregate(eventChan, f.watchChan, f.FolderConfiguration, f.model.cfg, ctx)
l.Infoln("Started filesystem watcher for folder", f.Description())
}
}
func (f *folder) restartWatch() {
f.watchCancel()
f.startWatch()
f.Scan(nil)
}
func (f *folder) scheduleWatchRestart() {
select {
case f.restartWatchChan <- struct{}{}:
default:
// We might be busy doing a pull and thus not reading from this
// channel. The channel is 1-buffered, so one notification will be
// queued to ensure we recheck after the pull.
}
}
func (f *folder) setError(err error) {
_, _, oldErr := f.getState()
if (err != nil && oldErr != nil && oldErr.Error() == err.Error()) || (err == nil && oldErr == nil) {
return
}
if err != nil {
if oldErr == nil {
l.Warnf("Error on folder %s: %v", f.Description(), err)
} else {
l.Infof("Error on folder %s changed: %q -> %q", f.Description(), oldErr, err)
}
} else {
l.Infoln("Cleared error on folder", f.Description())
}
if f.FSWatcherEnabled {
if err != nil {
f.watchCancel()
} else {
f.scheduleWatchRestart()
}
}
f.stateTracker.setError(err)
}