Async Python DDD utilities library

aioddd is an async Python DDD utilities library.

Installation

Use the package manager pip to install aioddd.

pip install aioddd

Documentation

• Visit aioddd docs.

Usage

from asyncio import get_event_loop
from dataclasses import dataclass
from typing import Type
from aioddd import NotFoundError, \
    Command, CommandHandler, SimpleCommandBus, \
    Query, QueryHandler, OptionalResponse, SimpleQueryBus, Event

_products = []

class ProductStored(Event):
    @dataclass
    class Attributes:
        ref: str

    attributes: Attributes

class StoreProductCommand(Command):
    def __init__(self, ref: str):
        self.ref = ref

class StoreProductCommandHandler(CommandHandler):
    def subscribed_to(self) -> Type[Command]:
        return StoreProductCommand

    async def handle(self, command: StoreProductCommand) -> None:
        _products.append(command.ref)

class ProductNotFoundError(NotFoundError):
    _code = 'product_not_found'
    _title = 'Product not found'

class FindProductQuery(Query):
    def __init__(self, ref: str):
        self.ref = ref

class FindProductQueryHandler(QueryHandler):
    def subscribed_to(self) -> Type[Query]:
        return FindProductQuery

    async def handle(self, query: FindProductQuery) -> OptionalResponse:
        if query.ref != '123':
            raise ProductNotFoundError.create(detail={'ref': query.ref})
        return {'ref': query.ref}

async def main() -> None:
    commands_bus = SimpleCommandBus([StoreProductCommandHandler()])
    await commands_bus.dispatch(StoreProductCommand('123'))
    query_bus = SimpleQueryBus([FindProductQueryHandler()])
    response = await query_bus.ask(FindProductQuery('123'))
    print(response)


if __name__ == '__main__':
    get_event_loop().run_until_complete(main())

Requirements

• Python >= 3.9

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

License

MIT