298 lines
9.2 KiB
Python
298 lines
9.2 KiB
Python
from decimal import Decimal
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from http import HTTPStatus
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from aws_lambda_powertools import Logger
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from aws_lambda_powertools.event_handler.exceptions import (
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NotFoundError,
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ServiceError,
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)
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from layercake.dateutils import now, ttl
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from layercake.dynamodb import DynamoDBPersistenceLayer, KeyPair, SortKey, TransactKey
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from layercake.strutils import md5_hash
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from config import COURSE_TABLE, DEDUP_WINDOW_OFFSET_DAYS
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logger = Logger(__name__)
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def update_progress(
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id: str,
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progress: Decimal,
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*,
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dynamodb_persistence_layer: DynamoDBPersistenceLayer,
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):
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now_ = now()
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reminder_ttl = ttl(start_dt=now_, days=7)
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try:
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with dynamodb_persistence_layer.transact_writer() as transact:
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# Update progress only if the enrollment status is `IN_PROGRESS`
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transact.update(
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key=KeyPair(id, '0'),
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update_expr='SET progress = :progress, \
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updated_at = :now',
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cond_expr='#status = :in_progress',
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expr_attr_names={
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'#status': 'status',
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},
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expr_attr_values={
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':in_progress': 'IN_PROGRESS',
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':progress': progress,
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':now': now_,
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},
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exc_cls=EnrollmentConflictError,
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)
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# Schedule a reminder if there is no activity after 7 days
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transact.put(
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item={
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'id': id,
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'sk': 'SCHEDULE#REMINDER_NO_ACTIVITY_AFTER_7_DAYS',
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'ttl': reminder_ttl,
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'created_at': now_,
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}
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)
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except EnrollmentConflictError:
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with dynamodb_persistence_layer.transact_writer() as transact:
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# If the enrollment status is `PENDING`, set it to `IN_PROGRESS`
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# and update `progress` and `updated_at`
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transact.update(
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key=KeyPair(id, '0'),
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update_expr='SET progress = :progress, \
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#status = :in_progress, \
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started_at = if_not_exists(started_at, :now), \
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updated_at = :now',
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cond_expr='#status = :pending',
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expr_attr_names={
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'#status': 'status',
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},
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expr_attr_values={
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':in_progress': 'IN_PROGRESS',
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':pending': 'PENDING',
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':progress': progress,
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':now': now_,
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},
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exc_cls=EnrollmentConflictError,
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)
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# Schedule a reminder for inactivity
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transact.put(
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item={
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'id': id,
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'sk': 'SCHEDULE#REMINDER_NO_ACTIVITY_AFTER_7_DAYS',
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'ttl': reminder_ttl,
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'created_at': now_,
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}
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)
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# Remove reminders and policies that no longer apply
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transact.delete(
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key=KeyPair(
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pk=id,
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sk='CANCEL_POLICY',
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),
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)
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transact.delete(
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key=KeyPair(
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pk=id,
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sk='SCHEDULE#REMINDER_NO_ACCESS_AFTER_3_DAYS',
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)
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)
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return True
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def set_score(
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id: str,
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/,
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score: Decimal,
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progress: Decimal,
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*,
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dynamodb_persistence_layer: DynamoDBPersistenceLayer,
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):
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enrollment = dynamodb_persistence_layer.collection.get_items(
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TransactKey(id)
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+ SortKey('0')
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+ SortKey(
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sk='METADATA#DEDUPLICATION_WINDOW',
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path_spec='offset_days',
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rename_key='dedup_window_offset_days',
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),
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)
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user_id = enrollment['user']['id']
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course_id = enrollment['course']['id']
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dedup_window_offset_days = int(
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enrollment.get('dedup_window_offset_days', DEDUP_WINDOW_OFFSET_DAYS)
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)
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try:
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if score >= 70:
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# Got a score of 70 or higher
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return _set_status_as_completed(
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id,
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score,
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progress=progress,
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user_id=user_id,
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course_id=course_id,
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dedup_window_offset_days=dedup_window_offset_days,
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dynamodb_persistence_layer=dynamodb_persistence_layer,
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)
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# Got a score below 70
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return _set_status_as_failed(
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id,
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score,
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progress=progress,
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dynamodb_persistence_layer=dynamodb_persistence_layer,
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)
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except EnrollmentConflictError as err:
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logger.exception(err)
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raise
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def _set_status_as_completed(
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id: str,
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/,
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score: Decimal,
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progress: Decimal,
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*,
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user_id: str,
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course_id: str,
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dedup_window_offset_days: int,
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dynamodb_persistence_layer: DynamoDBPersistenceLayer,
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) -> bool:
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now_ = now()
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lock_hash = md5_hash(f'{user_id}{course_id}')
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cert_exp_interval = int(
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dynamodb_persistence_layer.collection.get_item(
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KeyPair(
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pk=course_id,
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sk=SortKey('0', path_spec='cert.exp_interval'),
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table_name=COURSE_TABLE,
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),
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raise_on_error=False,
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default=0,
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)
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)
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with dynamodb_persistence_layer.transact_writer() as transact:
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transact.update(
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key=KeyPair(pk=id, sk='0'),
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update_expr='SET #status = :completed, \
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progress = :progress, \
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score = :score, \
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completed_at = if_not_exists(completed_at, :now), \
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updated_at = :now',
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cond_expr='#status = :in_progress',
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expr_attr_names={'#status': 'status'},
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expr_attr_values={
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':completed': 'COMPLETED',
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':in_progress': 'IN_PROGRESS',
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':score': score,
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':progress': progress,
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':now': now_,
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},
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exc_cls=EnrollmentConflictError,
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)
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if cert_exp_interval:
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dedup_lock_ttl = ttl(
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start_dt=now_,
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days=cert_exp_interval - dedup_window_offset_days,
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)
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transact.put(
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item={
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'id': id,
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'sk': 'SCHEDULE#REMINDER_CERT_EXPIRED',
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'ttl': ttl(start_dt=now_, days=cert_exp_interval),
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'created_at': now_,
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}
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)
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transact.put(
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item={
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'id': id,
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'sk': 'SCHEDULE#REMINDER_CERT_EXPIRATION_BEFORE_30_DAYS',
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'ttl': ttl(start_dt=now_, days=cert_exp_interval - 30),
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'created_at': now_,
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}
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)
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transact.put(
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item={
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'id': id,
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'sk': 'LOCK',
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'ttl': dedup_lock_ttl,
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'hash': lock_hash,
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'created_at': now_,
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}
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)
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transact.put(
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item={
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'id': 'LOCK',
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'sk': lock_hash,
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'enrollment_id': id,
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'ttl': dedup_lock_ttl,
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'created_at': now_,
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}
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)
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else:
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transact.put(
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item={
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'id': id,
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'sk': 'LOCK',
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'hash': lock_hash,
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'created_at': now_,
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}
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)
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transact.put(
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item={
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'id': 'LOCK',
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'sk': lock_hash,
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'enrollment_id': id,
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'created_at': now_,
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}
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)
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return True
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def _set_status_as_failed(
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id: str,
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/,
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score: Decimal,
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progress: Decimal,
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*,
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dynamodb_persistence_layer: DynamoDBPersistenceLayer,
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) -> bool:
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now_ = now()
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with dynamodb_persistence_layer.transact_writer() as transact:
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transact.update(
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key=KeyPair(pk=id, sk='0'),
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update_expr='SET #status = :failed, \
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progress = :progress, \
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score = :score, \
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access_expired = :true, \
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failed_at = if_not_exists(failed_at, :now), \
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updated_at = :now',
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cond_expr='#status = :in_progress',
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expr_attr_names={'#status': 'status'},
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expr_attr_values={
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':failed': 'FAILED',
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':in_progress': 'IN_PROGRESS',
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':score': score,
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':progress': progress,
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':true': True,
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':now': now_,
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},
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exc_cls=EnrollmentConflictError,
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)
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return True
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class EnrollmentNotFoundError(NotFoundError):
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def __init__(self, *_):
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super().__init__('Enrollment not found')
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class EnrollmentConflictError(ServiceError):
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def __init__(self, *_):
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super().__init__(HTTPStatus.CONFLICT, 'Enrollment status conflict')
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