A friendly dependency injection package
Project description
Depinj
Depinj is a python dependency injection library based on type annotations, it allow's you to define members of a class, and if the type of those members are in the dependency injection system it will be injected once that is called. For example
import depinj
import random
class RandomNumber:
rnumber = random.random()
class TestClass:
rnumber: RandomNumber
depinj.add_scoped(RandomNumber)
depinj.add_scoped(TestClass)
test_class = depinj.get_scoped(TestClass)
The test_class variable will have an scoped RandomNumber instance, there is support for singletons to, with the function add_singleton.
inject
There is an inject decorator that inject's the dependencies into function objects, for example following the previous code:
import depinj
@depinj.inject
def print_number(rn: RandomNumber):
print(rn.rnumber)
print_number()
It can also be used in the init method like this:
class TestClass:
rnumber: RandomNumber
@pydep.inject
def __init__(self, rnumber: RandomNumber):
self.rnumber = rnumber
test_class = TestClass()
Depinj object
from depinj import Injector
dep = Injector()
dep.add_scoped(SomeClass)
This Injector object represent's the dependency injection system, in fact, the functions defined at top-level module are using a global instance of the Depinj class. This way you can have multiple dependency injection systems if you want to have different classes for each one.
If you are going to use a different Injector object than the global one, then you have pass that object into the inject function with the injector named parameter.
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