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How to add middleware #1452

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a1nsworth asked this question in Q&A
How to add middleware #1452
@a1nsworth a1nsworth
Apr 11, 2025 · 1 comments · 4 replies
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a1nsworth
Apr 11, 2025

I`m using lib dishka and it provide Di for application, so i need way to pass some value to environ.

For example, dishka for FastApi

def setup_dishka(container: AsyncContainer | Container, app: FastAPI) -> None:
    if isinstance(container, AsyncContainer):
        app.add_middleware(ContainerMiddleware)
    else:
        app.add_middleware(SyncContainerMiddleware)
    app.state.dishka_container = container

I`m passing container to app and to request fastapi

I need some ways like it
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Replies: 1 comment · 4 replies

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miguelgrinberg
Apr 11, 2025
Maintainer

I'm not familiar with dishka so I cannot give you specific instructions, but Socket.IO comes with an ASGIApp adapter:

import socketio

sio = socketio.AsyncServer(async_mode='asgi')
app = socketio.ASGIApp(sio)

If you have an ASGI middleware that does what you need then you can just connect it to app.
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4 replies
@a1nsworth
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a1nsworth Apr 11, 2025
Author

Okay, but FastAPI provides a Request object for each request. Will Socket.IO provide it? Because, i`ll retrieve request: Request from args
@miguelgrinberg
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miguelgrinberg Apr 11, 2025
Maintainer

Socket.IO is normally used with WebSocket, so there are no requests. If you have the client's sid you can obtain the environ dictionary that was used in the initial connection using the get_environ() method of the server.
@a1nsworth
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a1nsworth Apr 11, 2025
Author

Is it possible to set global values to environ for each connection or for all connection ?
@miguelgrinberg
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miguelgrinberg Apr 11, 2025
Maintainer

As I said above, there is an adapter to make a Socket.IO server work as a ASGI application. You can modify incoming requests in a middleware if you like, but as I also mentioned, keep in mind Socket.IO uses WebSocket, so your middleware will have to be able to understand WebSocket in addition to HTTP.
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