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docs: downstream effect events corrected
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@ilee2u
ilee2u committed Sep 29, 2023
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Decision
--------
We've decided to use an event driven architecture because unlike the legacy system (edx-porctoring), edx-exams is an independent service.
We've decided to use an event driven architecture because unlike the legacy system (edx-proctoring), edx-exams is an independent service.
As such, we plan to use the event bus to send info to edx-platform services without needing a response as one would in a REST framework.

Below are lists of downstream effects of exam submission and review that we will or will not be translating into events in edx-exams as part of this decision.
Below are lists of downstream effects of exam submission and review that we will or will not be impementing as downstream effects that will be
triggered by events emitted in edx-exams per this decision.

Downstream effects to be implemented as events:
Downstream effects to be implemented:
***********************************************

* Grades Override - A python API call to the grades app to generate a grade override when an exam attempt is rejected.
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* We will implement this later since we do not believe this to be an essential feature.

For easier visualization, here are all of the events we plan to implement, described from end to end:
For easier visualization, here are all of the downstream effects we plan to port, described from end to end:

Downstream effects to be implemented as part of this decision:
**************************************************************
====================================== ================================================================================================ ============================================ =============================================== ========================================================================= ======================================================================================
Downstream Effect Context in which it's triggered Consumer Location Functions Called General Context for Calls Expected Result
====================================== ================================================================================================ ============================================ =============================================== ========================================================================= ======================================================================================
Grades Override When an exam attempt is rejected. lms/djangoapps/grades/signals.py override_subsection_grade in api.py When we need to override a grade from any service. A grade override object is created or modified in the grades service within the LMS.
Undo Grades Override When an exam attempt is verified after previously being rejected, OR when it is deleted/reset. lms/djangoapps/grades/signals.py undo_override_subsection_grade in services.py When we need to undo a grade override from any service. A grade override object is deleted in the grades service within the LMS.
Instructor Reset Subsection When an exam attempt is deleted/reset. lms/djangoapps/instructor/signals.py reset_student_attempts in enrollments.py When we need to reset a student’s state in a subsection. A learner's state for a subsection is reset.
Instructor Mark Subsection Completed When an exam attempt is completed. lms/djangoapps/instructor/signals.py update_exam_completion_task in tasks.py When we need to mark a subsection as completed. A subsection is marked completed for a learner.
Invalidate Certificate When an exam attempt is rejected. lms/djangoapps/certificates/signals.py invalidate_certificate in services.py When we need to invalidate a learner's certificate. A certificate object's status is set to "unavailable".
Set Credit Requirement Status When exam attempt is completed. openedx/core/djangoapps/credits/signals.py set_credit_requirement_status in services.py When we need to create or modify a learner's credit requirement status. A credit requirement status object is created or modified within the LMS.
====================================== ================================================================================================ ============================================ =============================================== ========================================================================= ======================================================================================

Event Triggers:
***************
We will define the events in edx-exams such that they are emitted whenever an exam attempt is submitted, rejected, verified, errored, or reset.
After these events are emitted, they will trigger their respective chosen downstream effects.

For easier visualization, here are all of the events we plan to implement:

Events to be implemented as part of this decision:
**************************************************
====================================== ================================================================================================ =========================================================================================== ============================================ ================================================ ========================================================================= ======================================================================================
Event Type Production Context Data sent Consumer Location Functions Called General Context for Calls Expected Result
====================================== ================================================================================================ =========================================================================================== ============================================ ================================================ ========================================================================= ======================================================================================
Grades Override When an exam attempt is rejected. user_id, course_key_or_id, usage_key_or_id, earned_all, earned_graded, overrider, comment lms/djangoapps/grades/signals.py override_subsection_grade in api.py When we need to override a grade from any service. A grade override object is created or modified in the grades service within the LMS.
Invalidate Certificate When an exam attempt is rejected. user_id, course_key_or_id lms/djangoapps/certificates/signals.py invalidate_certificate in services.py When we need to invalidate a learner's certificate. A certificate object's status is set to "unavailable".
Undo Grades Override When an exam attempt is verified after previously being rejected, OR when it is deleted/reset. user_id, course_key_or_id, usage_key_or_id lms/djangoapps/grades/signals.py undo_override_subsection_grade in services.py When we need to undo a grade override from any service. A grade override object is deleted in the grades service within the LMS.
Instructor Reset Subsection When an exam attempt is deleted/reset. username, course_id, content_id, requesting_user lms/djangoapps/instructor/signals.py reset_student_attempts in enrollments.py When we need to reset a student’s state in a subsection. A learner's state for a subsection is reset.
Remove Credit Requirement Status When an exam attempt is deleted/reset. user_id, course_key_or_id, req_namespace, req_name openedx/core/djangoapps/credits/signals.py remove_credit_requirement_status in services.py When we need to remove a learner's credit requirement status. A credit requirement status object is deleted within the LMS.
Set Credit Requirement Status When an exam attempt is completed. user_id, course_key_or_id, req_namespace, req_name, status openedx/core/djangoapps/credits/signals.py set_credit_requirement_status in services.py When we need to create or modify a learner's credit requirement status. A credit requirement status object is created or modified within the LMS.
Instructor Mark Subsection Completed When an exam attempt is completed. username, content_id lms/djangoapps/instructor/signals.py update_exam_completion_task in tasks.py When we need to mark a subsection as completed. A subsection is marked completed for a learner.
====================================== ================================================================================================ =========================================================================================== ============================================ ================================================ ========================================================================= ======================================================================================
======================== ======================================== ========================================================================
Event Type Context in which event is produced Downstream effects triggered
======================== ======================================== ========================================================================
Exam Attempt Submitted When an exam attempt is submitted. Instructor Mark Subsection Completed, Set Credit Requirement Status
Exam Attempt Rejected When an exam attempt is rejected. Set Credit Requirement Status, Grades Override, Invalidate Certificate
Exam Attempt Verified When an exam attempt is verified. Set Credit Requirement Status, Undo Grades Override
Exam Attempt Errored When exam attempt errors out. Set Credit Requirement Status
Exam Attempt Reset When an exam attempt is deleted/reset. Instructor Reset Subsection, Reset Credit Requirement Status
======================== ======================================== ========================================================================


Consequences
------------
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