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- from functools import partial
-
-
- class BaseMiddleware:
- """
- Base class for implementing ASGI middleware. Inherit from this and
- override the setup() method if you want to do things before you
- get to.
-
- Note that subclasses of this are not self-safe; don't store state on
- the instance, as it serves multiple application instances. Instead, use
- scope.
- """
-
- def __init__(self, inner):
- """
- Middleware constructor - just takes inner application.
- """
- self.inner = inner
-
- def __call__(self, scope):
- """
- ASGI constructor; can insert things into the scope, but not
- run asynchronous code.
- """
- # Copy scope to stop changes going upstream
- scope = dict(scope)
- # Allow subclasses to change the scope
- self.populate_scope(scope)
- # Call the inner application's init
- inner_instance = self.inner(scope)
- # Partially bind it to our coroutine entrypoint along with the scope
- return partial(self.coroutine_call, inner_instance, scope)
-
- async def coroutine_call(self, inner_instance, scope, receive, send):
- """
- ASGI coroutine; where we can resolve items in the scope
- (but you can't modify it at the top level here!)
- """
- await self.resolve_scope(scope)
- await inner_instance(receive, send)
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