github.com/demonoid81/moby@v0.0.0-20200517203328-62dd8e17c460/pkg/filenotify/poller_test.go (about)

     1  package filenotify // import "github.com/demonoid81/moby/pkg/filenotify"
     2  
     3  import (
     4  	"fmt"
     5  	"io/ioutil"
     6  	"os"
     7  	"runtime"
     8  	"testing"
     9  	"time"
    10  
    11  	"github.com/fsnotify/fsnotify"
    12  )
    13  
    14  func TestPollerAddRemove(t *testing.T) {
    15  	w := NewPollingWatcher()
    16  
    17  	if err := w.Add("no-such-file"); err == nil {
    18  		t.Fatal("should have gotten error when adding a non-existent file")
    19  	}
    20  	if err := w.Remove("no-such-file"); err == nil {
    21  		t.Fatal("should have gotten error when removing non-existent watch")
    22  	}
    23  
    24  	f, err := ioutil.TempFile("", "asdf")
    25  	if err != nil {
    26  		t.Fatal(err)
    27  	}
    28  	defer os.RemoveAll(f.Name())
    29  
    30  	if err := w.Add(f.Name()); err != nil {
    31  		t.Fatal(err)
    32  	}
    33  
    34  	if err := w.Remove(f.Name()); err != nil {
    35  		t.Fatal(err)
    36  	}
    37  }
    38  
    39  func TestPollerEvent(t *testing.T) {
    40  	if runtime.GOOS == "windows" {
    41  		t.Skip("No chmod on Windows")
    42  	}
    43  	w := NewPollingWatcher()
    44  
    45  	f, err := ioutil.TempFile("", "test-poller")
    46  	if err != nil {
    47  		t.Fatal("error creating temp file")
    48  	}
    49  	defer os.RemoveAll(f.Name())
    50  	f.Close()
    51  
    52  	if err := w.Add(f.Name()); err != nil {
    53  		t.Fatal(err)
    54  	}
    55  
    56  	select {
    57  	case <-w.Events():
    58  		t.Fatal("got event before anything happened")
    59  	case <-w.Errors():
    60  		t.Fatal("got error before anything happened")
    61  	default:
    62  	}
    63  
    64  	if err := ioutil.WriteFile(f.Name(), []byte("hello"), 0600); err != nil {
    65  		t.Fatal(err)
    66  	}
    67  	assertFileMode(t, f.Name(), 0600)
    68  	if err := assertEvent(w, fsnotify.Write); err != nil {
    69  		t.Fatal(err)
    70  	}
    71  
    72  	if err := os.Chmod(f.Name(), 0644); err != nil {
    73  		t.Fatal(err)
    74  	}
    75  	assertFileMode(t, f.Name(), 0644)
    76  	if err := assertEvent(w, fsnotify.Chmod); err != nil {
    77  		t.Fatal(err)
    78  	}
    79  
    80  	if err := os.Remove(f.Name()); err != nil {
    81  		t.Fatal(err)
    82  	}
    83  	if err := assertEvent(w, fsnotify.Remove); err != nil {
    84  		t.Fatal(err)
    85  	}
    86  }
    87  
    88  func TestPollerClose(t *testing.T) {
    89  	w := NewPollingWatcher()
    90  	if err := w.Close(); err != nil {
    91  		t.Fatal(err)
    92  	}
    93  	// test double-close
    94  	if err := w.Close(); err != nil {
    95  		t.Fatal(err)
    96  	}
    97  
    98  	f, err := ioutil.TempFile("", "asdf")
    99  	if err != nil {
   100  		t.Fatal(err)
   101  	}
   102  	defer os.RemoveAll(f.Name())
   103  	if err := w.Add(f.Name()); err == nil {
   104  		t.Fatal("should have gotten error adding watch for closed watcher")
   105  	}
   106  }
   107  
   108  func assertFileMode(t *testing.T, fileName string, mode uint32) {
   109  	t.Helper()
   110  	f, err := os.Stat(fileName)
   111  	if err != nil {
   112  		t.Fatal(err)
   113  	}
   114  	if f.Mode() != os.FileMode(mode) {
   115  		t.Fatalf("expected file %s to have mode %#o, but got %#o", fileName, mode, f.Mode())
   116  	}
   117  }
   118  
   119  func assertEvent(w FileWatcher, eType fsnotify.Op) error {
   120  	var err error
   121  	select {
   122  	case e := <-w.Events():
   123  		if e.Op != eType {
   124  			err = fmt.Errorf("got wrong event type, expected %q: %v", eType, e.Op)
   125  		}
   126  	case e := <-w.Errors():
   127  		err = fmt.Errorf("got unexpected error waiting for events %v: %v", eType, e)
   128  	case <-time.After(watchWaitTime * 3):
   129  		err = fmt.Errorf("timeout waiting for event %v", eType)
   130  	}
   131  	return err
   132  }