Attaching to running graphs fails sporadically

ezmsg-org / ezmsg

Pure-Python DAG-based high-performance SHM-backed pub-sub and multi-processing pattern

https://ezmsg.readthedocs.io/en/latest/

MIT License

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Attaching to running graphs fails sporadically #4

Closed griffinmilsap closed 1 year ago

griffinmilsap commented 1 year ago

To reproduce:

Run ezmsg_toy.py
Run ezmsg_attach.py in another terminal
- Sometimes ezmsg_attach.py only publishes one message and hangs
Interrupt ezmsg_attach.py with ^c
Run ezmsg_attach.py again
- Usually ezmsg_attach.py only reports one message and hangs
Interrupt ezmsg_attach.py with ^c
- This interrupt fails and the terminal must be killed because sigint is captured
Run ezmsg_attach.py again
- This causes both ezmsg_toy.py and ezmsg_attach.py to crash

griffinmilsap commented 1 year ago

Need to add a test for attaching/detaching to a system. Problem appears to be with the current structure/design of GraphServer. Need to adopt a pattern similar to the pub<->sub connection