def get(self, request, project_id, task_id):
"""Returns the (possibly) new layer ID where the isochrone
data has been added. If the task has not yet completed a status message is returned
Note: `project_id` is only used for permissions checking!
Returns 500 in case of exceptions
Returns 404 in case of task not found
Returns 200 ok for all other cases
Response body:
{
"status": "complete", // or "pending" or "error", full list at
// https://huey.readthedocs.io/en/latest/signals.html#signals
"exception": "Normally empty, error message in case of errors",
"progress": [
100, // Progress %
],
"task_result": {
"qgis_layer_id": "4f2a88a1-ca93-4859-9de3-75d9728cde0e"
}
}
TODO: move this into core, make it generic for task status and result reporting
"""
try:
# Try to retrieve the task result, may throw an exception
try:
result = HUEY.result(task_id)
ret_status = status.HTTP_200_OK
except TaskException:
result = None
ret_status = status.HTTP_500_INTERNAL_SERVER_ERROR
task_model = TaskModel.objects.get(task_id=task_id)
progress_info = task_model.progress_info
try:
progress_percentage = int(100 * progress_info[0] /
task_model.total)
except:
progress_percentage = 0
try:
return Response(
{
'status': task_model.state.signal_name,
'exception': task_model.state.exception_line,
'progress': progress_percentage,
'task_result': result
},
status=ret_status)
except:
return Response(
{
'status': 'error',
'exception': 'Error retrieving task informations',
'progress': 0,
'task_result': result,
},
status=status.HTTP_500_INTERNAL_SERVER_ERROR)
except TaskModel.DoesNotExist:
# Handle pending
pending_task_ids = [task.id for task in HUEY.pending()]
if task_id in pending_task_ids:
return Response({'result': True, 'status': 'pending'})
return Response({
'result': False,
'error': _('Task not found!')
},
status=status.HTTP_404_NOT_FOUND)
