cancel enrollment on billing

2025-08-20 12:19:17 -03:00
parent 18221ee1f4
commit 6c301d320b
8 changed files with 288 additions and 53 deletions
--- a/order-events/app/events/billing/cancel_enrollment.py
+++ b/order-events/app/events/billing/cancel_enrollment.py
@@ -0,0 +1,84 @@
+from datetime import datetime
+
+from aws_lambda_powertools import Logger
+from aws_lambda_powertools.utilities.data_classes import (
+    EventBridgeEvent,
+    event_source,
+)
+from aws_lambda_powertools.utilities.typing import LambdaContext
+from layercake.dateutils import fromisoformat, now
+from layercake.dynamodb import DynamoDBPersistenceLayer, KeyPair, SortKey, TransactKey
+from layercake.funcs import pick
+
+from boto3clients import dynamodb_client
+from config import ENROLLMENT_TABLE, ORDER_TABLE
+from utils import get_billing_period
+
+logger = Logger(__name__)
+enrollment_layer = DynamoDBPersistenceLayer(ENROLLMENT_TABLE, dynamodb_client)
+order_layer = DynamoDBPersistenceLayer(ORDER_TABLE, dynamodb_client)
+
+
+@event_source(data_class=EventBridgeEvent)
+@logger.inject_lambda_context
+def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
+    now_ = now()
+    new_image = event.detail['new_image']
+    enrollment_id = new_image['id']
+    subscription = enrollment_layer.collection.get_items(
+        TransactKey(enrollment_id)
+        + SortKey('METADATA#SUBSCRIPTION_COVERED')
+        # Post-migration: uncomment the following line
+        # + SortKey('CANCELED', path_spec='author', rename_key='author')
+        + SortKey('canceled', path_spec='author', rename_key='author')
+    )
+
+    created_at: datetime = fromisoformat(new_image['create_date'])  # type: ignore
+    start_date, end_date = get_billing_period(
+        billing_day=int(subscription['billing_day']),
+        date_=created_at,
+    )
+    pk = 'BILLING#ORG#{org_id}'.format(org_id=subscription['org_id'])
+    sk = 'START#{start}#END#{end}'.format(
+        start=start_date.isoformat(),
+        end=end_date.isoformat(),
+    )
+
+    if now_.date() > end_date:
+        logger.debug('Enrollment outside the billing period')
+        return False
+
+    try:
+        author = subscription.get('author')
+        # Retrieve canceled enrollment data
+        old_enrollment = order_layer.collection.get_item(
+            KeyPair(
+                pk=pk,
+                sk=f'{sk}#ENROLLMENT#{enrollment_id}',
+            ),
+            exc_cls=EnrollmentNotFoundError,
+        )
+
+        order_layer.put_item(
+            item={
+                'id': pk,
+                'sk': f'{sk}#ENROLLMENT#{enrollment_id}#CANCELED',
+                'unit_price': old_enrollment['unit_price'] * -1,
+                'created_at': now_,
+            }
+            | pick(('user', 'course', 'enrolled_at'), old_enrollment)
+            # Add author if present
+            | ({'author': author} if author else {}),
+            cond_expr='attribute_not_exists(sk)',
+        )
+    except Exception as exc:
+        logger.exception(
+            exc,
+            keypair={'pk': pk, 'sk': sk},
+        )
+        return False
+    else:
+        return True
+
+
+class EnrollmentNotFoundError(Exception): ...