[chore] [exporterhelper] Move shutdown error from queue package (#9554)

The error is created by the retry sender and used by the queue sender.
It doesn't belong to queue package

exporter/exporterhelper/retry_sender.go

@@ -17,7 +17,7 @@ import (
 	"go.opentelemetry.io/collector/config/configretry"
 	"go.opentelemetry.io/collector/consumer/consumererror"
 	"go.opentelemetry.io/collector/exporter"
-	"go.opentelemetry.io/collector/exporter/internal/queue"
+	"go.opentelemetry.io/collector/exporter/internal/experr"
 	"go.opentelemetry.io/collector/internal/obsreportconfig/obsmetrics"
 )
 
@@ -127,7 +127,7 @@ func (rs *retrySender) send(ctx context.Context, req Request) error {
 		case <-ctx.Done():
 			return fmt.Errorf("request is cancelled or timed out %w", err)
 		case <-rs.stopCh:
-			return queue.NewShutdownErr(err)
+			return experr.NewShutdownErr(err)
 		case <-time.After(backoffDelay):
 		}
 	}

exporter/internal/experr/err.go

@@ -1,7 +1,9 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package queue // import "go.opentelemetry.io/collector/exporter/internal/queue"
+package experr // import "go.opentelemetry.io/collector/exporter/internal/experr"
+
+import "errors"
 
 type shutdownErr struct {
 	err error
@@ -18,3 +20,8 @@ func (s shutdownErr) Error() string {
 func (s shutdownErr) Unwrap() error {
 	return s.err
 }
+
+func IsShutdownErr(err error) bool {
+	var sdErr shutdownErr
+	return errors.As(err, &sdErr)
+}

exporter/internal/experr/err_test.go

@@ -0,0 +1,24 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package experr
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewShutdownErr(t *testing.T) {
+	err := NewShutdownErr(errors.New("some error"))
+	assert.Equal(t, "interrupted due to shutdown: some error", err.Error())
+}
+
+func TestIsShutdownErr(t *testing.T) {
+	err := errors.New("testError")
+	require.False(t, IsShutdownErr(err))
+	err = NewShutdownErr(err)
+	require.True(t, IsShutdownErr(err))
+}

exporter/internal/queue/persistent_queue.go

@@ -17,6 +17,7 @@ import (
 
 	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/exporter"
+	"go.opentelemetry.io/collector/exporter/internal/experr"
 	"go.opentelemetry.io/collector/extension/experimental/storage"
 )
 
@@ -360,7 +361,7 @@ func (pq *persistentQueue[T]) getNextItem(ctx context.Context) (T, func(error),
 			pq.mu.Unlock()
 		}()
 
-		if errors.As(consumeErr, &shutdownErr{}) {
+		if experr.IsShutdownErr(consumeErr) {
 			// The queue is shutting down, don't mark the item as dispatched, so it's picked up again after restart.
 			// TODO: Handle partially delivered requests by updating their values in the storage.
 			return

exporter/internal/queue/persistent_queue_test.go

@@ -18,6 +18,7 @@ import (
 
 	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/exporter/exportertest"
+	"go.opentelemetry.io/collector/exporter/internal/experr"
 	"go.opentelemetry.io/collector/extension/experimental/storage"
 	"go.opentelemetry.io/collector/extension/extensiontest"
 	"go.opentelemetry.io/collector/pdata/pcommon"
@@ -411,7 +412,7 @@ func TestPersistentQueue_CorruptedData(t *testing.T) {
 			}
 			assert.Equal(t, 3, ps.Size())
 			require.True(t, ps.Consume(func(context.Context, tracesRequest) error {
-				return NewShutdownErr(nil)
+				return experr.NewShutdownErr(nil)
 			}))
 			assert.Equal(t, 2, ps.Size())
 
@@ -523,7 +524,7 @@ func TestPersistentQueueStartWithNonDispatched(t *testing.T) {
 		// put one more item in
 		require.NoError(t, ps.Offer(context.Background(), req))
 		require.Equal(t, 5, ps.Size())
-		return NewShutdownErr(nil)
+		return experr.NewShutdownErr(nil)
 	}))
 	assert.NoError(t, ps.Shutdown(context.Background()))