mirror of
https://github.com/syncthing/syncthing.git
synced 2024-11-16 10:28:49 -07:00
122 lines
3.5 KiB
Go
122 lines
3.5 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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// +build !solaris,!darwin solaris,cgo darwin,cgo
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package fs
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import (
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"context"
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"errors"
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"fmt"
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"path/filepath"
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"strings"
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"github.com/syncthing/notify"
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)
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// Notify does not block on sending to channel, so the channel must be buffered.
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// The actual number is magic.
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// Not meant to be changed, but must be changeable for tests
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var backendBuffer = 500
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func (f *BasicFilesystem) Watch(name string, ignore Matcher, ctx context.Context, ignorePerms bool) (<-chan Event, error) {
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absName, err := f.rootedSymlinkEvaluated(name)
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if err != nil {
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return nil, err
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}
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outChan := make(chan Event)
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backendChan := make(chan notify.EventInfo, backendBuffer)
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eventMask := subEventMask
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if !ignorePerms {
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eventMask |= permEventMask
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}
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if ignore.SkipIgnoredDirs() {
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absShouldIgnore := func(absPath string) bool {
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return ignore.ShouldIgnore(f.unrootedChecked(absPath))
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}
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err = notify.WatchWithFilter(filepath.Join(absName, "..."), backendChan, absShouldIgnore, eventMask)
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} else {
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err = notify.Watch(filepath.Join(absName, "..."), backendChan, eventMask)
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}
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if err != nil {
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notify.Stop(backendChan)
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if reachedMaxUserWatches(err) {
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err = errors.New("failed to setup inotify handler. Please increase inotify limits, see https://docs.syncthing.net/users/faq.html#inotify-limits")
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}
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return nil, err
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}
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go f.watchLoop(name, backendChan, outChan, ignore, ctx)
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return outChan, nil
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}
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func (f *BasicFilesystem) watchLoop(name string, backendChan chan notify.EventInfo, outChan chan<- Event, ignore Matcher, ctx context.Context) {
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for {
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// Detect channel overflow
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if len(backendChan) == backendBuffer {
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outer:
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for {
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select {
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case <-backendChan:
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default:
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break outer
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}
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}
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// When next scheduling a scan, do it on the entire folder as events have been lost.
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outChan <- Event{Name: name, Type: NonRemove}
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l.Debugln(f.Type(), f.URI(), "Watch: Event overflow, send \".\"")
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}
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select {
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case ev := <-backendChan:
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relPath := f.unrootedChecked(ev.Path())
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if ignore.ShouldIgnore(relPath) {
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l.Debugln(f.Type(), f.URI(), "Watch: Ignoring", relPath)
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continue
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}
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evType := f.eventType(ev.Event())
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select {
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case outChan <- Event{Name: relPath, Type: evType}:
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l.Debugln(f.Type(), f.URI(), "Watch: Sending", relPath, evType)
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case <-ctx.Done():
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notify.Stop(backendChan)
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l.Debugln(f.Type(), f.URI(), "Watch: Stopped")
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return
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}
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case <-ctx.Done():
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notify.Stop(backendChan)
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l.Debugln(f.Type(), f.URI(), "Watch: Stopped")
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return
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}
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}
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}
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func (f *BasicFilesystem) eventType(notifyType notify.Event) EventType {
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if notifyType&rmEventMask != 0 {
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return Remove
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}
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return NonRemove
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}
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// unrootedChecked returns the path relative to the folder root (same as
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// unrooted). It panics if the given path is not a subpath and handles the
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// special case when the given path is the folder root without a trailing
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// pathseparator.
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func (f *BasicFilesystem) unrootedChecked(absPath string) string {
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if absPath+string(PathSeparator) == f.rootSymlinkEvaluated {
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return "."
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}
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if !strings.HasPrefix(absPath, f.rootSymlinkEvaluated) {
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panic(fmt.Sprintf("bug: Notify backend is processing a change outside of the filesystem root: root==%v, rootSymEval==%v, path==%v", f.root, f.rootSymlinkEvaluated, absPath))
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}
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return f.unrootedSymlinkEvaluated(absPath)
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}
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