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