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Debugging processes in LiveBook

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jswny

jswny

Debugging processes in LiveBook

I’m trying to test out some supervision stuff with GenServers in LiveBook. I’ve easily managed to start the GenServers, which I assume are running under some master LiveBook supervisor.

My question is; how do you debug a process running in the background in LiveBook? As far as I can tell, there’s no way to access the console in LiveBook. So how can I debug this without console access?

I need to send it messages and normally I’d just have it print out some results to the console when it get the message and processes it.

6 comments
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Marked As Solved

axelson

axelson

Scenic Core Team

Have you tried doing a Logger.info call from a process? I think that should get printed out by Livebook (at least it does in NervesLivebook and I don’t think it is setting up anything special there).

1
Post #6

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cmo

cmo

You could probably start observer to see if your theory about the supervision tree is true.

You can start an iex shell iex --sname coolname --cookie monster -S mix and then attach your livebook session to that.

And, can’t you just send messages to your GenServer from livebook anyway? Throw some inspect/puts/Logger.debug and you should see that in livebook.

1
Post #2
jswny

jswny

Wow that’s awesome! Thanks for the tip! I never would have thought to use Logger! It’s a bit odd that it runs in whatever cell was evaluated last but it works!

1
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