103 lines
3.1 KiB
Python
103 lines
3.1 KiB
Python
from dataclasses import asdict, dataclass
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from uuid import uuid4
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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 (
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DynamoDBPersistenceLayer,
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KeyChain,
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KeyPair,
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SortKey,
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TransactKey,
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)
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from boto3clients import dynamodb_client
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from config import COURSE_TABLE, ENROLLMENT_TABLE, ORDER_TABLE
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logger = Logger(__name__)
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order_layer = DynamoDBPersistenceLayer(ORDER_TABLE, dynamodb_client)
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course_layer = DynamoDBPersistenceLayer(COURSE_TABLE, dynamodb_client)
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enrollment_layer = DynamoDBPersistenceLayer(ENROLLMENT_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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order_id = new_image['id']
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order = order_layer.collection.get_items(
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TransactKey(order_id) + SortKey('0') + SortKey('items', path_spec='items'),
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)
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# Post-migration (orders): rename `tenant_id` to `org_id`
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org_id = order['tenant_id']
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items = {
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item['id']: int(item['quantity'])
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for item in order['items']
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# Ignore items with non-positive unit price;
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# negative values are treated as discounts
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if item['unit_price'] > 0
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}
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courses = _get_courses(set(items.keys()))
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slots = tuple(course for course in courses for _ in range(items.get(course.id, 0)))
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logger.info('Course slots generated', slots=slots)
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with enrollment_layer.transact_writer() as transact:
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for slot in slots:
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transact.put(
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item={
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'id': f'vacancies#{org_id}',
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'sk': f'{order_id}#{uuid4()}',
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# Post-migration (orders): uncomment the follow lines
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# 'id': f'SLOT#ORG#{org_id}',
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# 'sk': f'ORDER#{order_id}#ENROLLMENT#{uuid4()}',
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'course': asdict(slot),
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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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return order_layer.update_item(
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key=KeyPair(new_image['id'], new_image['sk']),
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update_expr='SET #status = :status, updated_at = :now',
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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': 'SUCCESS',
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':now': now_,
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},
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cond_expr='attribute_exists(sk)',
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)
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@dataclass(frozen=True)
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class Course:
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id: str
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name: str
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access_period: int
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def _get_courses(ids: set) -> tuple[Course, ...]:
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pairs = tuple(KeyPair(idx, '0') for idx in ids)
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r = course_layer.collection.get_items(
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KeyChain(pairs),
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flatten_top=False,
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)
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courses = tuple(
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Course(
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id=idx,
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name=obj['name'],
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access_period=obj['access_period'],
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)
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for idx, obj in r.items()
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)
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return courses
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