Add celery task for exporting dataset

app/api/tasks.py

@@ -7,7 +7,8 @@ from django.contrib.auth import get_user_model
 from django.shortcuts import get_object_or_404
 
 from .models import Document, Label, Project
-from .serializers import DocumentSerializer, LabelSerializer
+from .views.download.factory import create_repository, create_writer
+from .views.download.service import ExportApplicationService
 from .views.upload.exception import FileParseException
 from .views.upload.factory import (get_data_class, get_dataset_class,
                                    get_label_class)
@@ -123,3 +124,13 @@ def injest_data(user_id, project_id, filenames, format: str, **kwargs):
         buffer.clear()
 
     return response
+
+
+@shared_task
+def export_dataset(project_id, format: str, export_approved=False):
+    project = get_object_or_404(Project, pk=project_id)
+    repository = create_repository(project)
+    writer = create_writer(format)(settings.MEDIA_ROOT)
+    service = ExportApplicationService(repository, writer)
+    filepath = service.export(export_approved)
+    return filepath