72 lines
2.0 KiB
Python
72 lines
2.0 KiB
Python
from datetime import timedelta
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from aws_lambda_powertools import Logger
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from aws_lambda_powertools.utilities.data_classes import (
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EventBridgeEvent,
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event_source,
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)
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from aws_lambda_powertools.utilities.typing import LambdaContext
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from layercake.dateutils import now
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from layercake.dynamodb import DynamoDBPersistenceLayer, KeyPair, SortKey
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from boto3clients import dynamodb_client
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from config import (
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COURSE_TABLE,
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ENROLLMENT_TABLE,
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)
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logger = Logger(__name__)
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enrollment_layer = DynamoDBPersistenceLayer(ENROLLMENT_TABLE, dynamodb_client)
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course_layer = DynamoDBPersistenceLayer(COURSE_TABLE, dynamodb_client)
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@event_source(data_class=EventBridgeEvent)
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@logger.inject_lambda_context
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def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
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new_image = event.detail['new_image']
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now_ = now()
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try:
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course = _get_course(new_image['course']['id'])
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access_period = int(course['access_period'])
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access_expires_at = now_ + timedelta(days=access_period)
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with enrollment_layer.transact_writer() as transact:
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transact.update(
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key=KeyPair(new_image['id'], new_image['sk']),
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update_expr='SET access_expires_at = :access_expires_at',
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expr_attr_values={
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':access_expires_at': access_expires_at,
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},
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)
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except Exception as exc:
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logger.exception(exc)
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return False
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else:
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return True
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class CourseNotFoundError(Exception):
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def __init__(self, *args):
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super().__init__('Course not found')
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def _get_course(id: str) -> dict:
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course = course_layer.get_item(KeyPair(pk=id, sk='0'))
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if course:
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return course
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course_id = course_layer.collection.get_item(
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KeyPair(
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pk='MIGRATION',
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sk=SortKey(
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f'COURSE#{id}',
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path_spec='course_id',
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),
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),
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exc_cls=CourseNotFoundError,
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)
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return course_layer.collection.get_item(
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KeyPair(pk=course_id, sk='0'),
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)
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