Typed resolver (dependency container) for Python
Project description
tres
Typed resolver (dependency container) for Python
It provides a dependency container for you to use in typed dependency resolution.
That's all. Very type resolution. Much wow.
Inspired by the dependency container in tsyringe, but more Pythonic.
Usage:
from tres import container, InjectionToken
def a(n: int) -> str:
return str(n)
def b(a: int, b: int) -> int:
return a + b
a_token = InjectionToken[Callable[[int], str]]()
b_token = InjectionToken[Callable[[int, int], int]]()
container.register(a_token, a)
container.register(b_token, b)
container.register(b_token, a) # type error
def c(f: Callable[[int], str]):
print(f(1))
c(container[a_token])
c(container[b_token]) # type error
A longer example registering a Protocol
# application logic
from typing import Protocol, Iterable
class OrdersProtocol(Protocol):
def byId(self, id) -> Order:
...
def getLines(self, id) -> Iterable[OrderLine]:
...
OrdersStoreToken = tres.InjectionToken[OrdersProtocol]()
def calculate_total(orders_store: OrdersProtocol, order_id):
order = orders_store.byId(order_id)
lines = orders_store.getLines(order_id)
return sum(line.price for line in lines) + order.shipping
# implementation
from config import URL
from domain import Order, OrderLine
from application import OrdersProtocol, OrdersStoreToken
class OrdersStore(OrdersProtocol):
def __init__(self, url):
self.url = url
def byId(self, id):
return map(Order, requests.get(f'{self.url}/order/{id}').json())
def getLines(self, id):
return map(OrderLine, requests.get(f'{self.url}/order/{id}/lines').json())
tres.container.register(OrdersStoreToken, OrdersStore(URL))
# consumer
from application import calculate_total, OrdersStoreToken
def order_view(order_id):
orders_store = tres.container[OrdersStoreToken]
order = orders_store.byId(order_id)
total = calculate_total(orders_store, order_id)
return f'{order.id} - {order.date}: {total}'
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