Celery task to fetch course roster asynchronously

[marcospri]

For:

• SPIKE: Start fetching course rosters using LTIA API #6185

A celery task that just forwards the call to the service.

Testing

• Launch at least one LTI1.3 assignment https://hypothesis.instructure.com/courses/319/assignments/3308

• In make shell

Fech one roster asynchronously

from lms.tasks.course_roster import fetch_roster


fetch_roster.delay(lms_course_id=db.query(models.LMSCourse).filter(models.LMSCourse.lti_context_memberships_url.is_not(None)).first().id)

In the make dev log you'll see something like:

INFO/ForkPoolWorker-16] lms.tasks.course_roster.fetch_roster[fdac8f5e-976c-4421-806a-9781c6c45cbe] Task lms.tasks.course_roster.fetch_roster[fdac8f5e-976c-4421-806a-9781c6c45cbe] succeeded in 3.8122543759982364s: None