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Description:

iservice 0.2.3

iservice

Helper class to make FastAPI dependencies with ease.
Simple use
# iservice_a.py
import typing

import iservice

class ServiceA(iservice.Service, typing.Protocol):
@staticmethod
def send(name: str) -> None: ...

# service_a1.py
def send(name: str) -> None:
print(f"Hello {name}")

# service_a2.py
def send(name: str) -> None:
print(f"Greetings {name}")

# service_a.py
import iservice_a
import service_a1
import service_a2

def _welcome_user(service: iservice_a.ServiceA, name: str) -> None:
service.send(name)

# inject will provide an inferred type that are matching the expected signature
# (str) -> None
hello = iservice.inject(_welcome_user, service_a1)
greeting = iservice.inject(_welcome_user, service_a2)

In this case, in case of incorrect calls, mypy will raise errors like:
hello(1) # Argument 1 has incompatible type "int"; expected "str"
greeting(1) # Argument 1 has incompatible type "int"; expected "str"