Is it possible to enable mitm script at runtime?

I have a question about mitmproxy (mitmdump).

What I need is to change mitmproxy configuration at runtime. I have some scripts, let's say:

scripts/
  test-case-1.py
  test-case-2.py

and I need to load (or unload) a proper script while mitmdump is running. Unfortunaly, running mitmdump -s /scripts/test-case-1.py returns

/scripts # mitmdump -s ./test-case-1.py 
Error starting proxy server: OSError(98, 'Address in use')

Is it possible to somehow call the mitmdump to append a proper script?

Thanks for your support!

Solution

On Python level addons (and scripts usually contain Mitm addons) can be added and removed at run-time. But AFAIK in mitmdump there is no interface for doing so (not sure about mitmproxy/mitmweb).

One possibility would be to build a plugin based on the ASGI-Flask example addon. It provides a virtual host that can be accessed via Mitmproxy and if a certain path on that server like example.com/enableaddon1 you can enable or disable a second addon. Alternatively you can simply change a global variable that makes your second add-on behave differently.

This requires a bit of Python programming but it gives you a lot flexibility.