Fix issue with closing pager stream (#9020)

Signed-off-by: Babak K. Shandiz <babak.k.shandiz@gmail.com>

pkg/cmd/api/api.go

@@ -309,6 +309,14 @@ func apiRun(opts *ApiOptions) error {
 		method = "POST"
 	}
 
+	if !opts.Silent {
+		if err := opts.IO.StartPager(); err == nil {
+			defer opts.IO.StopPager()
+		} else {
+			fmt.Fprintf(opts.IO.ErrOut, "failed to start pager: %v\n", err)
+		}
+	}
+
 	var bodyWriter io.Writer = opts.IO.Out
 	var headersWriter io.Writer = opts.IO.Out
 	if opts.Silent {
@@ -324,19 +332,13 @@ func apiRun(opts *ApiOptions) error {
 		requestPath = addPerPage(requestPath, 100, params)
 	}
 
-	// Execute defers in FIFO order.
-	deferQueue := queue{}
-	defer deferQueue.Close()
-
 	// Similar to `jq --slurp`, write all pages JSON arrays or objects into a JSON array.
 	if opts.Paginate && opts.Slurp {
 		w := &jsonArrayWriter{
 			Writer: bodyWriter,
 			color:  opts.IO.ColorEnabled(),
 		}
-		deferQueue.Enqueue(func() {
-			_ = w.Close()
-		})
+		defer w.Close()
 
 		bodyWriter = w
 	}
@@ -386,14 +388,6 @@ func apiRun(opts *ApiOptions) error {
 		return err
 	}
 
-	if !opts.Silent {
-		if err := opts.IO.StartPager(); err == nil {
-			deferQueue.Enqueue(opts.IO.StopPager)
-		} else {
-			fmt.Fprintf(opts.IO.ErrOut, "failed to start pager: %v\n", err)
-		}
-	}
-
 	host, _ := cfg.Authentication().DefaultHost()
 
 	if opts.Hostname != "" {
@@ -693,15 +687,3 @@ func previewNamesToMIMETypes(names []string) string {
 	}
 	return strings.Join(types, ", ")
 }
-
-type queue []func()
-
-func (q *queue) Enqueue(f func()) {
-	*q = append(*q, f)
-}
-
-func (q *queue) Close() {
-	for _, f := range *q {
-		f()
-	}
-}

pkg/cmd/api/api_test.go

@@ -1761,20 +1761,3 @@ func Test_apiRun_acceptHeader(t *testing.T) {
 		})
 	}
 }
-
-func TestQueue_Close(t *testing.T) {
-	sut := queue{}
-	actual := make([]int, 0, 2)
-
-	func() {
-		defer sut.Close()
-		sut.Enqueue(func() {
-			actual = append(actual, 0)
-		})
-		sut.Enqueue(func() {
-			actual = append(actual, 1)
-		})
-	}()
-
-	assert.Equal(t, []int{0, 1}, actual)
-}