mirror of
https://github.com/octoleo/syncthing.git
synced 2024-12-23 03:18:59 +00:00
117 lines
3.3 KiB
Go
117 lines
3.3 KiB
Go
// 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 http://mozilla.org/MPL/2.0/.
|
|
|
|
// +build !solaris,!darwin solaris,cgo darwin,cgo
|
|
|
|
package fs
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"path/filepath"
|
|
|
|
"github.com/zillode/notify"
|
|
)
|
|
|
|
// Notify does not block on sending to channel, so the channel must be buffered.
|
|
// The actual number is magic.
|
|
// Not meant to be changed, but must be changeable for tests
|
|
var backendBuffer = 500
|
|
|
|
func (f *BasicFilesystem) Watch(name string, ignore Matcher, ctx context.Context, ignorePerms bool) (<-chan Event, error) {
|
|
absName, err := f.rooted(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
absShouldIgnore := func(absPath string) bool {
|
|
return ignore.ShouldIgnore(f.unrootedChecked(absPath))
|
|
}
|
|
|
|
outChan := make(chan Event)
|
|
backendChan := make(chan notify.EventInfo, backendBuffer)
|
|
|
|
eventMask := subEventMask
|
|
if !ignorePerms {
|
|
eventMask |= permEventMask
|
|
}
|
|
|
|
if err := notify.WatchWithFilter(filepath.Join(absName, "..."), backendChan, absShouldIgnore, eventMask); err != nil {
|
|
notify.Stop(backendChan)
|
|
if reachedMaxUserWatches(err) {
|
|
err = errors.New("failed to install inotify handler. Please increase inotify limits, see https://github.com/syncthing/syncthing-inotify#troubleshooting-for-folders-with-many-files-on-linux for more information")
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
go f.watchLoop(name, absName, backendChan, outChan, ignore, ctx)
|
|
|
|
return outChan, nil
|
|
}
|
|
|
|
func (f *BasicFilesystem) watchLoop(name string, absName string, backendChan chan notify.EventInfo, outChan chan<- Event, ignore Matcher, ctx context.Context) {
|
|
for {
|
|
// Detect channel overflow
|
|
if len(backendChan) == backendBuffer {
|
|
outer:
|
|
for {
|
|
select {
|
|
case <-backendChan:
|
|
default:
|
|
break outer
|
|
}
|
|
}
|
|
// When next scheduling a scan, do it on the entire folder as events have been lost.
|
|
outChan <- Event{Name: name, Type: NonRemove}
|
|
l.Debugln(f.Type(), f.URI(), "Watch: Event overflow, send \".\"")
|
|
}
|
|
|
|
select {
|
|
case ev := <-backendChan:
|
|
relPath := f.unrootedChecked(ev.Path())
|
|
if ignore.ShouldIgnore(relPath) {
|
|
l.Debugln(f.Type(), f.URI(), "Watch: Ignoring", relPath)
|
|
continue
|
|
}
|
|
evType := f.eventType(ev.Event())
|
|
select {
|
|
case outChan <- Event{Name: relPath, Type: evType}:
|
|
l.Debugln(f.Type(), f.URI(), "Watch: Sending", relPath, evType)
|
|
case <-ctx.Done():
|
|
notify.Stop(backendChan)
|
|
l.Debugln(f.Type(), f.URI(), "Watch: Stopped")
|
|
return
|
|
}
|
|
case <-ctx.Done():
|
|
notify.Stop(backendChan)
|
|
l.Debugln(f.Type(), f.URI(), "Watch: Stopped")
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (f *BasicFilesystem) eventType(notifyType notify.Event) EventType {
|
|
if notifyType&rmEventMask != 0 {
|
|
return Remove
|
|
}
|
|
return NonRemove
|
|
}
|
|
|
|
// unrootedChecked returns the path relative to the folder root (same as
|
|
// unrooted). It panics if the given path is not a subpath and handles the
|
|
// special case when the given path is the folder root without a trailing
|
|
// pathseparator.
|
|
func (f *BasicFilesystem) unrootedChecked(absPath string) string {
|
|
if absPath+string(PathSeparator) == f.root {
|
|
return "."
|
|
}
|
|
relPath := f.unrooted(absPath)
|
|
if relPath == absPath {
|
|
panic("bug: Notify backend is processing a change outside of the watched path: " + absPath)
|
|
}
|
|
return relPath
|
|
}
|