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fake_watcher.go
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fake_watcher.go
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package fsevent
import (
"path/filepath"
"sync"
"sync/atomic"
"github.com/tilt-dev/tilt/internal/ospath"
"github.com/tilt-dev/tilt/internal/watch"
"github.com/tilt-dev/tilt/pkg/logger"
)
type FakeMultiWatcher struct {
Events chan watch.FileEvent
Errors chan error
mu sync.Mutex
watchers []*FakeWatcher
subs []chan watch.FileEvent
subsErrors []chan error
}
func NewFakeMultiWatcher() *FakeMultiWatcher {
r := &FakeMultiWatcher{
Events: make(chan watch.FileEvent, 20),
Errors: make(chan error, 20),
}
go r.loop()
return r
}
func (w *FakeMultiWatcher) NewSub(paths []string, ignore watch.PathMatcher, _ logger.Logger) (watch.Notify, error) {
subCh := make(chan watch.FileEvent)
errorCh := make(chan error)
w.mu.Lock()
defer w.mu.Unlock()
watcher := NewFakeWatcher(subCh, errorCh, paths, ignore)
w.watchers = append(w.watchers, watcher)
w.subs = append(w.subs, subCh)
w.subsErrors = append(w.subsErrors, errorCh)
return watcher, nil
}
func (w *FakeMultiWatcher) getSubs() []chan watch.FileEvent {
w.mu.Lock()
defer w.mu.Unlock()
return append([]chan watch.FileEvent{}, w.subs...)
}
func (w *FakeMultiWatcher) getSubErrors() []chan error {
w.mu.Lock()
defer w.mu.Unlock()
return append([]chan error{}, w.subsErrors...)
}
func (w *FakeMultiWatcher) loop() {
defer func() {
for _, sub := range w.getSubs() {
close(sub)
}
}()
defer func() {
for _, sub := range w.getSubErrors() {
close(sub)
}
}()
for {
select {
case e, ok := <-w.Events:
if !ok {
return
}
w.mu.Lock()
for _, watcher := range w.watchers {
if watcher.matches(e.Path()) {
watcher.inboundCh <- e
}
}
w.mu.Unlock()
case e, ok := <-w.Errors:
if !ok {
return
}
for _, sub := range w.getSubErrors() {
sub <- e
}
}
}
}
type FakeWatcher struct {
inboundCh chan watch.FileEvent
outboundCh chan watch.FileEvent
errorCh chan error
eventCount uint64
paths []string
ignore watch.PathMatcher
}
func NewFakeWatcher(inboundCh chan watch.FileEvent, errorCh chan error, paths []string, ignore watch.PathMatcher) *FakeWatcher {
for i, path := range paths {
paths[i], _ = filepath.Abs(path)
}
return &FakeWatcher{
inboundCh: inboundCh,
outboundCh: make(chan watch.FileEvent, 20),
errorCh: errorCh,
paths: paths,
ignore: ignore,
}
}
func (w *FakeWatcher) matches(path string) bool {
ignore, _ := w.ignore.Matches(path)
if ignore {
return false
}
for _, watched := range w.paths {
if ospath.IsChild(watched, path) {
return true
}
}
return false
}
func (w *FakeWatcher) Start() error {
go w.loop()
return nil
}
func (w *FakeWatcher) Close() error {
return nil
}
func (w *FakeWatcher) Errors() chan error {
return w.errorCh
}
func (w *FakeWatcher) Events() chan watch.FileEvent {
return w.outboundCh
}
func (w *FakeWatcher) TotalEventCount() uint64 {
return atomic.LoadUint64(&w.eventCount)
}
func (w *FakeWatcher) QueuedCount() int {
return len(w.outboundCh)
}
func (w *FakeWatcher) loop() {
var q []watch.FileEvent
for {
if len(q) == 0 {
e, ok := <-w.inboundCh
if !ok {
close(w.outboundCh)
return
}
q = append(q, e)
} else {
e := q[0]
w.outboundCh <- e
atomic.AddUint64(&w.eventCount, 1)
q = q[1:]
}
}
}
var _ watch.Notify = &FakeWatcher{}