313 lines
9.0 KiB
Python
313 lines
9.0 KiB
Python
from datetime import date, datetime, time, timedelta
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from decimal import Decimal
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from http import HTTPStatus
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from typing import Annotated
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from uuid import uuid4
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import pytz
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from aws_lambda_powertools import Logger
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from aws_lambda_powertools.event_handler.api_gateway import Router
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from aws_lambda_powertools.event_handler.exceptions import (
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ServiceError,
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)
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from aws_lambda_powertools.event_handler.openapi.params import Body
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from aws_lambda_powertools.shared.functions import extract_event_from_common_models
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from layercake.batch import BatchProcessor
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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.extra_types import CpfStr, NameStr
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from layercake.strutils import md5_hash
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from pydantic import UUID4, BaseModel, EmailStr, Field, FutureDate
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from typing_extensions import TypedDict
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from boto3clients import dynamodb_client
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from config import DEDUP_WINDOW_OFFSET_DAYS, ENROLLMENT_TABLE, TZ, USER_TABLE
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from exceptions import ConflictError
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from middlewares.authentication_middleware import User as Authenticated
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logger = Logger(__name__)
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router = Router()
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dyn = DynamoDBPersistenceLayer(ENROLLMENT_TABLE, dynamodb_client)
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processor = BatchProcessor()
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class SubscriptionRequiredError(ServiceError):
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def __init__(self, msg: str | dict):
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super().__init__(HTTPStatus.NOT_ACCEPTABLE, msg)
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class DeduplicationConflictError(ConflictError): ...
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class User(BaseModel):
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id: str | UUID4
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name: NameStr
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email: EmailStr
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cpf: CpfStr
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class Course(BaseModel):
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id: UUID4
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name: str
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access_period: int
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unit_price: Decimal = Field(exclude=True)
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class DeduplicationWindow(BaseModel):
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offset_days: int
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class SubscriptionTerms(BaseModel):
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billing_day: int
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class Enrollment(BaseModel):
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id: UUID4 = Field(default_factory=uuid4)
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user: User
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course: Course
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scheduled_for: FutureDate | None = None
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deduplication_window: DeduplicationWindow | None = None
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class Org(BaseModel):
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id: str | UUID4
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name: str
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@router.post('/')
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def enroll(
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org_id: Annotated[str | UUID4, Body(embed=True)],
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enrollments: Annotated[tuple[Enrollment, ...], Body(embed=True)],
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):
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now_ = now()
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created_by: Authenticated = router.context['user']
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org = dyn.collection.get_items(
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KeyPair(
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pk=str(org_id),
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sk='0',
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table_name=USER_TABLE,
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)
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+ KeyPair(
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pk=str(org_id),
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sk='METADATA#SUBSCRIPTION_TERMS',
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rename_key='terms',
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table_name=USER_TABLE,
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)
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+ KeyPair(
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pk='SUBSCRIPTION',
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sk=f'ORG#{org_id}',
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rename_key='subscribed',
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table_name=USER_TABLE,
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)
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)
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if 'subscribed' not in org:
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raise SubscriptionRequiredError('Organization not subscribed')
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ctx = {
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'org': Org.model_validate(org),
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'created_by': created_by,
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'terms': SubscriptionTerms.model_validate(org['terms']),
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}
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immediate = [e for e in enrollments if not e.scheduled_for]
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later = [e for e in enrollments if e.scheduled_for]
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with processor(immediate, enroll_now, ctx) as batch:
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now_out = batch.process()
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with processor(later, enroll_later, ctx) as batch:
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later_out = batch.process()
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def fmt(r):
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return {
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'status': r.status.value,
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'input_record': extract_event_from_common_models(r.input_record),
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'output': extract_event_from_common_models(r.output),
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'cause': r.cause,
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}
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item = {
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'id': f'SUBMISSION#ORG#{org_id}',
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'sk': now_,
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'enrolled': list(map(fmt, now_out)) if now_out else None,
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'scheduled': list(map(fmt, later_out)) if later_out else None,
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'ttl': ttl(start_dt=now_, days=30 * 3),
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'created_by': {
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'id': created_by.id,
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'name': created_by.name,
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},
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}
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try:
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dyn.put_item(item=item)
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except Exception as exc:
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logger.exception(exc)
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finally:
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return item
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Context = TypedDict(
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'Context',
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{
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'org': Org,
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'terms': SubscriptionTerms,
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'created_by': Authenticated,
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},
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)
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def enroll_now(enrollment: Enrollment, context: Context):
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now_ = now()
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user = enrollment.user
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course = enrollment.course
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org: Org = context['org']
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subscription_terms: SubscriptionTerms = context['terms']
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created_by: Authenticated = context['created_by']
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lock_hash = md5_hash(f'{user.id}{course.id}')
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access_expires_at = now_ + timedelta(days=course.access_period)
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deduplication_window = enrollment.deduplication_window
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offset_days = (
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int(deduplication_window.offset_days)
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if deduplication_window
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else DEDUP_WINDOW_OFFSET_DAYS
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)
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dedup_lock_ttl = ttl(
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start_dt=now_,
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days=course.access_period - offset_days,
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)
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with dyn.transact_writer() as transact:
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transact.put(
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item={
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'id': enrollment.id,
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'sk': '0',
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'score': None,
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'progress': 0,
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'status': 'PENDING',
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'user': user.model_dump(),
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'course': course.model_dump(),
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'access_expires_at': access_expires_at,
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'subscription_covered': True,
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'org_id': org.id,
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'created_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': enrollment.id,
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'sk': 'ORG',
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'name': org.name,
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'org_id': org.id,
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'created_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': 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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transact.put(
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item={
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'id': enrollment.id,
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'sk': 'METADATA#SUBSCRIPTION_COVERED',
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'org_id': org.id,
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'billing_day': subscription_terms.billing_day,
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'created_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': enrollment.id,
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'sk': 'CREATED_BY',
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'created_by': {
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'id': created_by.id,
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'name': created_by.name,
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},
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'created_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': 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': dedup_lock_ttl,
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},
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)
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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': dedup_lock_ttl,
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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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# The deduplication window can be recalculated based on user settings.
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if deduplication_window:
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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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return enrollment
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def enroll_later(enrollment: Enrollment, context: Context):
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now_ = now()
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user = enrollment.user
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course = enrollment.course
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scheduled_for = date_to_midnight(enrollment.scheduled_for) # type: ignore
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deduplication_window = enrollment.deduplication_window
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org: Org = context['org']
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subscription_terms: SubscriptionTerms = context['terms']
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created_by: Authenticated = context['created_by']
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lock_hash = md5_hash(f'{user.id}{course.id}')
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with dyn.transact_writer() as transact:
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transact.put(
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item={
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'id': f'SCHEDULED#ORG#{org.id}',
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'sk': f'{scheduled_for.isoformat()}#{lock_hash}',
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'user': user.model_dump(),
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'course': course.model_dump(),
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'org_name': org.name,
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'created_by': {
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'id': created_by.id,
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'name': created_by.name,
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},
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'subscription_billing_day': subscription_terms.billing_day,
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'ttl': ttl(start_dt=scheduled_for),
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'created_at': now_,
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}
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| (
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{'dedup_window_offset_days': deduplication_window.offset_days}
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if deduplication_window
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else {}
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),
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)
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transact.put(
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item={
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'id': 'LOCK#SCHEDULED',
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'sk': lock_hash,
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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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exc_cls=DeduplicationConflictError,
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)
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def date_to_midnight(dt: date) -> datetime:
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return datetime.combine(dt, time(0, 0)).replace(tzinfo=pytz.timezone(TZ))
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