27 lines
858 B
Python
27 lines
858 B
Python
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class BaseMiddleware:
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"""
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Base class for implementing ASGI middleware. Inherit from this and
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override the setup() method if you want to do things before you
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get to.
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Note that subclasses of this are not self-safe; don't store state on
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the instance, as it serves multiple application instances. Instead, use
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scope.
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"""
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def __init__(self, inner):
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"""
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Middleware constructor - just takes inner application.
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"""
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self.inner = inner
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async def __call__(self, scope, receive, send):
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"""
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ASGI application; can insert things into the scope and run asynchronous
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code.
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"""
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# Copy scope to stop changes going upstream
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scope = dict(scope)
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# Run the inner application along with the scope
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return await self.inner(scope, receive, send)
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