add file poller panic fix from 1.10.2

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

daemon/logger/jsonfilelog/jsonfilelog_test.go

@@ -199,3 +199,50 @@ func TestJSONFileLoggerWithLabelsEnv(t *testing.T) {
 		t.Fatalf("Wrong log attrs: %q, expected %q", extra, expected)
 	}
 }
+
+func BenchmarkJSONFileLoggerWithReader(b *testing.B) {
+	b.StopTimer()
+	b.ResetTimer()
+	cid := "a7317399f3f857173c6179d44823594f8294678dea9999662e5c625b5a1c7657"
+	dir, err := ioutil.TempDir("", "json-logger-bench")
+	if err != nil {
+		b.Fatal(err)
+	}
+	defer os.RemoveAll(dir)
+
+	l, err := New(logger.Context{
+		ContainerID: cid,
+		LogPath:     filepath.Join(dir, "container.log"),
+	})
+	if err != nil {
+		b.Fatal(err)
+	}
+	defer l.Close()
+	msg := &logger.Message{ContainerID: cid, Line: []byte("line"), Source: "src1"}
+	jsonlog, err := (&jsonlog.JSONLog{Log: string(msg.Line) + "\n", Stream: msg.Source, Created: msg.Timestamp}).MarshalJSON()
+	if err != nil {
+		b.Fatal(err)
+	}
+	b.SetBytes(int64(len(jsonlog)+1) * 30)
+
+	b.StartTimer()
+
+	go func() {
+		for i := 0; i < b.N; i++ {
+			for j := 0; j < 30; j++ {
+				l.Log(msg)
+			}
+		}
+		l.Close()
+	}()
+
+	lw := l.(logger.LogReader).ReadLogs(logger.ReadConfig{Follow: true})
+	watchClose := lw.WatchClose()
+	for {
+		select {
+		case <-lw.Msg:
+		case <-watchClose:
+			return
+		}
+	}
+}

pkg/filenotify/poller.go

@@ -118,8 +118,6 @@ func (w *filePoller) Close() error {
 		w.remove(name)
 		delete(w.watches, name)
 	}
-	close(w.events)
-	close(w.errors)
 	return nil
 }
 
@@ -146,6 +144,7 @@ func (w *filePoller) sendErr(e error, chClose <-chan struct{}) error {
 // watch is responsible for polling the specified file for changes
 // upon finding changes to a file or errors, sendEvent/sendErr is called
 func (w *filePoller) watch(f *os.File, lastFi os.FileInfo, chClose chan struct{}) {
+	defer f.Close()
 	for {
 		time.Sleep(watchWaitTime)
 		select {

pkg/filenotify/poller_test.go

@@ -93,24 +93,6 @@ func TestPollerClose(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	select {
-	case _, open := <-w.Events():
-		if open {
-			t.Fatal("event chan should be closed")
-		}
-	default:
-		t.Fatal("event chan should be closed")
-	}
-
-	select {
-	case _, open := <-w.Errors():
-		if open {
-			t.Fatal("errors chan should be closed")
-		}
-	default:
-		t.Fatal("errors chan should be closed")
-	}
-
 	f, err := ioutil.TempFile("", "asdf")
 	if err != nil {
 		t.Fatal(err)