Support for Cloud Tasks and Python 3 App Engine environment ?

[patb2]

Would this implementation work with Cloud Tasks within Python 3 App Engine ?

[AlexisH]

One would have to adapt it, also checking if it's compatible with the new ndb lib for Python3, and replacing the usage of webapp2 by another lib like Flask.

But the core would remain the same : the DeferredHandler could be left unchanged (except for webapp2) and for the enqueue part integrating with Cloud Tasks would look like :

parent = client.queue_path(projectId, regionId, queue)
if countdown:
    scheduleDate = datetime.utcnow() + timedelta(seconds=countdown)
elif eta:
    scheduleDate = datetime.utcfromtimestamp(eta)
else:
    scheduleDate = datetime.utcnow()
task = {
        # "2014-10-02T15:01:23.045123456Z"
        'scheduleTime': scheduleDate.strftime('%Y-%m-%dT%H:%M:%S.0Z'),
        'appEngineHttpRequest': {
            'httpMethod': 'POST',
            'relativeUri': url,
            'body': base64.b64encode(payload).decode()
        }
  }
  if taskName:
      task['name'] = f'projects/{projectId}/locations/{regionId}/queues/{queue}/tasks/{taskName}'
  if target:
      version, service = target.rsplit('.', 1)
      task['appEngineHttpRequest']['appEngineRouting'] = {
          'service': service,
          'version': version
      }
client.create_task(parent, task)

Also note that linking the enqueue task operation with a datastore transaction would no longer be possible (_transactional keyword).