github.com/ruphin/docker@v1.10.1/pkg/filenotify/poller_test.go (about)

     1  package filenotify
     2  
     3  import (
     4  	"fmt"
     5  	"io/ioutil"
     6  	"os"
     7  	"testing"
     8  	"time"
     9  
    10  	"gopkg.in/fsnotify.v1"
    11  )
    12  
    13  func TestPollerAddRemove(t *testing.T) {
    14  	w := NewPollingWatcher()
    15  
    16  	if err := w.Add("no-such-file"); err == nil {
    17  		t.Fatal("should have gotten error when adding a non-existent file")
    18  	}
    19  	if err := w.Remove("no-such-file"); err == nil {
    20  		t.Fatal("should have gotten error when removing non-existent watch")
    21  	}
    22  
    23  	f, err := ioutil.TempFile("", "asdf")
    24  	if err != nil {
    25  		t.Fatal(err)
    26  	}
    27  	defer os.RemoveAll(f.Name())
    28  
    29  	if err := w.Add(f.Name()); err != nil {
    30  		t.Fatal(err)
    31  	}
    32  
    33  	if err := w.Remove(f.Name()); err != nil {
    34  		t.Fatal(err)
    35  	}
    36  }
    37  
    38  func TestPollerEvent(t *testing.T) {
    39  	w := NewPollingWatcher()
    40  
    41  	f, err := ioutil.TempFile("", "test-poller")
    42  	if err != nil {
    43  		t.Fatal("error creating temp file")
    44  	}
    45  	defer os.RemoveAll(f.Name())
    46  	f.Close()
    47  
    48  	if err := w.Add(f.Name()); err != nil {
    49  		t.Fatal(err)
    50  	}
    51  
    52  	select {
    53  	case <-w.Events():
    54  		t.Fatal("got event before anything happened")
    55  	case <-w.Errors():
    56  		t.Fatal("got error before anything happened")
    57  	default:
    58  	}
    59  
    60  	if err := ioutil.WriteFile(f.Name(), []byte("hello"), 644); err != nil {
    61  		t.Fatal(err)
    62  	}
    63  	if err := assertEvent(w, fsnotify.Write); err != nil {
    64  		t.Fatal(err)
    65  	}
    66  
    67  	if err := os.Chmod(f.Name(), 600); err != nil {
    68  		t.Fatal(err)
    69  	}
    70  	if err := assertEvent(w, fsnotify.Chmod); err != nil {
    71  		t.Fatal(err)
    72  	}
    73  
    74  	if err := os.Remove(f.Name()); err != nil {
    75  		t.Fatal(err)
    76  	}
    77  	if err := assertEvent(w, fsnotify.Remove); err != nil {
    78  		t.Fatal(err)
    79  	}
    80  }
    81  
    82  func TestPollerClose(t *testing.T) {
    83  	w := NewPollingWatcher()
    84  	if err := w.Close(); err != nil {
    85  		t.Fatal(err)
    86  	}
    87  	// test double-close
    88  	if err := w.Close(); err != nil {
    89  		t.Fatal(err)
    90  	}
    91  
    92  	select {
    93  	case _, open := <-w.Events():
    94  		if open {
    95  			t.Fatal("event chan should be closed")
    96  		}
    97  	default:
    98  		t.Fatal("event chan should be closed")
    99  	}
   100  
   101  	select {
   102  	case _, open := <-w.Errors():
   103  		if open {
   104  			t.Fatal("errors chan should be closed")
   105  		}
   106  	default:
   107  		t.Fatal("errors chan should be closed")
   108  	}
   109  
   110  	f, err := ioutil.TempFile("", "asdf")
   111  	if err != nil {
   112  		t.Fatal(err)
   113  	}
   114  	defer os.RemoveAll(f.Name())
   115  	if err := w.Add(f.Name()); err == nil {
   116  		t.Fatal("should have gotten error adding watch for closed watcher")
   117  	}
   118  }
   119  
   120  func assertEvent(w FileWatcher, eType fsnotify.Op) error {
   121  	var err error
   122  	select {
   123  	case e := <-w.Events():
   124  		if e.Op != eType {
   125  			err = fmt.Errorf("got wrong event type, expected %q: %v", eType, e)
   126  		}
   127  	case e := <-w.Errors():
   128  		err = fmt.Errorf("got unexpected error waiting for events %v: %v", eType, e)
   129  	case <-time.After(watchWaitTime * 3):
   130  		err = fmt.Errorf("timeout waiting for event %v", eType)
   131  	}
   132  	return err
   133  }