314 lines
9.6 KiB
Python
314 lines
9.6 KiB
Python
from dataclasses import asdict, dataclass
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from typing import Self, TypedDict
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from uuid import uuid4
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from aws_lambda_powertools.event_handler.exceptions import (
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BadRequestError,
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NotFoundError,
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)
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from layercake.dateutils import now, ttl
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from layercake.dynamodb import DynamoDBPersistenceLayer, KeyPair
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from layercake.strutils import md5_hash
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from config import ORDER_TABLE
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from models import Course, Enrollment
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Tenant = TypedDict('Tenant', {'id': str, 'name': str})
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Author = TypedDict('Author', {'id': str, 'name': str})
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DeduplicationWindow = TypedDict('DeduplicationWindow', {'offset_days': int})
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class LinkedEntity(str):
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def __new__(cls, id: str, type: str) -> Self:
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return super().__new__(cls, '#'.join([type.upper(), id]))
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def __init__(self, id: str, type: str) -> None:
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# __init__ is used to store the parameters for later reference.
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# For immutable types like str, __init__ cannot change the instance's value.
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self.id = id
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self.type = type
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@dataclass(frozen=True)
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class Slot:
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id: str
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sk: str
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@property
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def order_id(self) -> LinkedEntity:
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idx, _ = self.sk.split('#')
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return LinkedEntity(idx, 'order')
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class SlotDoesNotExistError(NotFoundError):
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def __init__(self, *args):
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super().__init__('Slot not found')
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class DeduplicationConflictError(BadRequestError):
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def __init__(self, *args):
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super().__init__('Enrollment already exists')
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class EnrollmentConflictError(BadRequestError):
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def __init__(self, *_):
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super().__init__('Enrollment status conflict')
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def enroll(
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enrollment: Enrollment,
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*,
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tenant: Tenant,
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slot: Slot | None = None,
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author: Author | None = None,
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linked_entities: frozenset[LinkedEntity] = frozenset(),
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deduplication_window: DeduplicationWindow | None = None,
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persistence_layer: DynamoDBPersistenceLayer,
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) -> bool:
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"""Enrolls a user into a course and schedules lifecycle events."""
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now_ = now()
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user = enrollment.user
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course = enrollment.course
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tenant_id = tenant['id']
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lock_hash = md5_hash('%s%s' % (user.id, course.id))
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with persistence_layer.transact_writer() as transact:
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if slot:
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linked_entities = frozenset({slot.order_id}) | linked_entities
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transact.put(
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item={
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'sk': '0',
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'created_at': now_,
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'tenant_id': tenant_id,
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**enrollment.model_dump(),
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},
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)
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transact.put(
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item={
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'id': enrollment.id,
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'sk': 'tenant',
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'org_id': tenant_id,
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'name': tenant['name'],
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'created_at': now_,
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},
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)
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for entity in linked_entities:
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type = entity.type.lower()
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transact.put(
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item={
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'id': enrollment.id,
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'sk': f'LINKED_ENTITIES#{type}',
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'created_at': now_,
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f'{type}_id': entity.id,
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}
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)
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if slot:
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transact.put(
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item={
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'id': enrollment.id,
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# Post-migration: uncomment the following line
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# 'sk': 'metadata#parent_slot',
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'sk': 'parent_vacancy',
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'vacancy': asdict(slot),
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'created_at': now_,
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}
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)
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transact.delete(
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key=KeyPair(slot.id, slot.sk),
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cond_expr='attribute_exists(sk)',
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exc_cls=SlotDoesNotExistError,
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)
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transact.put(
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item={
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'id': enrollment.id,
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'sk': 'CANCEL_POLICY',
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'created_at': now_,
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}
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)
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if author:
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transact.put(
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item={
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'id': enrollment.id,
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'sk': 'author',
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'user_id': author['id'],
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'name': author['name'],
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'created_at': now_,
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},
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)
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# Prevents the user from enrolling in the same course again until
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# the deduplication window expires or is removed.
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if deduplication_window:
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offset_days = deduplication_window['offset_days']
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ttl_expiration = ttl(start_dt=now_, days=course.access_period - offset_days)
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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': enrollment.id,
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'created_at': now_,
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'ttl': ttl_expiration,
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},
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cond_expr='attribute_not_exists(sk)',
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exc_cls=DeduplicationConflictError,
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)
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transact.put(
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item={
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'id': enrollment.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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'ttl': ttl_expiration,
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},
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)
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# Deduplication window can be recalculated if needed
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transact.put(
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item={
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'id': enrollment.id,
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'sk': 'metadata#deduplication_window',
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'offset_days': offset_days,
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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.condition(
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key=KeyPair('lock', lock_hash),
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cond_expr='attribute_not_exists(sk)',
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exc_cls=DeduplicationConflictError,
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)
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return True
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def set_status_as_canceled(
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id: str,
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*,
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lock_hash: str | None = None,
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created_by: Author,
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course: Course | None = None,
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vacancy_key: KeyPair | None = None,
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persistence_layer: DynamoDBPersistenceLayer,
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):
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"""Cancel the enrollment if there's a `cancel_policy`
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and put its vacancy back if `vacancy_key` is provided."""
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now_ = now()
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with persistence_layer.transact_writer() as transact:
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transact.update(
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key=KeyPair(id, '0'),
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update_expr='SET #status = :canceled, updated_at = :updated_at',
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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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':canceled': 'CANCELED',
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':pending': 'PENDING',
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':updated_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': 'CANCELED',
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'canceled_by': created_by,
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'canceled_at': now_,
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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='CANCEL_POLICY',
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),
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cond_expr='attribute_exists(sk)',
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exc_cls=EnrollmentConflictError,
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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='SCHEDULE#REMINDER_NO_ACCESS_AFTER_3_DAYS',
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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_ACTIVITY_AFTER_7_DAYS',
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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_ACCESS_PERIOD_BEFORE_30_DAYS',
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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_CERT_EXPIRATION_BEFORE_30_DAYS',
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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#SET_AS_EXPIRED',
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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='parent_vacancy',
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)
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)
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if lock_hash:
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transact.delete(key=KeyPair(id, 'LOCK'))
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transact.delete(key=KeyPair('LOCK', lock_hash))
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if vacancy_key and course:
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vacancy_pk, vacancy_sk = vacancy_key.values()
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org_id = vacancy_pk.removeprefix('vacancies#')
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order_id, enrollment_id = vacancy_sk.split('#')
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transact.condition(
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key=KeyPair(order_id, '0'),
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cond_expr='attribute_exists(id)',
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table_name=ORDER_TABLE,
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)
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# Put the vacancy back and assign a new ID
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transact.put(
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item={
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# Post-migration: uncomment the following line
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# 'id': f'slots#org#{org_id}',
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'id': f'vacancies#{org_id}',
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'sk': f'{order_id}#{uuid4()}',
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'course': course,
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'created_at': now_,
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},
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cond_expr='attribute_not_exists(sk)',
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)
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# Set the status of `generated_items` to `ROLLBACK` to know
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# which slot is available for reuse
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transact.update(
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# Post-migration: uncomment the following line
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# key=KeyPair(order_id, f'slots#enrollment#{enrollment_id}'),
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key=KeyPair(order_id, f'generated_items#{enrollment_id}'),
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update_expr='SET #status = :status, updated_at = :updated_at',
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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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':status': 'ROLLBACK',
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':updated_at': now_,
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},
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cond_expr='attribute_exists(sk)',
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table_name=ORDER_TABLE,
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)
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return True
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