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moby--moby/pkg/filenotify/poller_test.go

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package filenotify // import "github.com/docker/docker/pkg/filenotify"
import (
"fmt"
"io/ioutil"
"os"
"runtime"
"testing"
"time"
"github.com/fsnotify/fsnotify"
)
func TestPollerAddRemove(t *testing.T) {
w := NewPollingWatcher()
if err := w.Add("no-such-file"); err == nil {
t.Fatal("should have gotten error when adding a non-existent file")
}
if err := w.Remove("no-such-file"); err == nil {
t.Fatal("should have gotten error when removing non-existent watch")
}
f, err := ioutil.TempFile("", "asdf")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(f.Name())
if err := w.Add(f.Name()); err != nil {
t.Fatal(err)
}
if err := w.Remove(f.Name()); err != nil {
t.Fatal(err)
}
}
func TestPollerEvent(t *testing.T) {
if runtime.GOOS == "windows" {
t.Skip("No chmod on Windows")
}
w := NewPollingWatcher()
f, err := ioutil.TempFile("", "test-poller")
if err != nil {
t.Fatal("error creating temp file")
}
defer os.RemoveAll(f.Name())
f.Close()
if err := w.Add(f.Name()); err != nil {
t.Fatal(err)
}
select {
case <-w.Events():
t.Fatal("got event before anything happened")
case <-w.Errors():
t.Fatal("got error before anything happened")
default:
}
if err := ioutil.WriteFile(f.Name(), []byte("hello"), 0644); err != nil {
t.Fatal(err)
}
if err := assertEvent(w, fsnotify.Write); err != nil {
t.Fatal(err)
}
if err := os.Chmod(f.Name(), 600); err != nil {
t.Fatal(err)
}
if err := assertEvent(w, fsnotify.Chmod); err != nil {
t.Fatal(err)
}
if err := os.Remove(f.Name()); err != nil {
t.Fatal(err)
}
if err := assertEvent(w, fsnotify.Remove); err != nil {
t.Fatal(err)
}
}
func TestPollerClose(t *testing.T) {
w := NewPollingWatcher()
if err := w.Close(); err != nil {
t.Fatal(err)
}
// test double-close
if err := w.Close(); err != nil {
t.Fatal(err)
}
f, err := ioutil.TempFile("", "asdf")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(f.Name())
if err := w.Add(f.Name()); err == nil {
t.Fatal("should have gotten error adding watch for closed watcher")
}
}
func assertEvent(w FileWatcher, eType fsnotify.Op) error {
var err error
select {
case e := <-w.Events():
if e.Op != eType {
err = fmt.Errorf("got wrong event type, expected %q: %v", eType, e.Op)
}
case e := <-w.Errors():
err = fmt.Errorf("got unexpected error waiting for events %v: %v", eType, e)
case <-time.After(watchWaitTime * 3):
err = fmt.Errorf("timeout waiting for event %v", eType)
}
return err
}