Yuvi Panda

JupyterHub | MyBinder | Kubernetes | Open Culture

Devlog 2018 12 26

Physical activity

I walked for about 6 miles yesterday evening, after doing 3-4 miles each day for about 2-3 days before. The roads were empty, and it was lovely. I’ve listened to maybe 6-10 hours of Deborah Frances-White in the last week or so, split between The Guilty Feminist and Global Pillage. Next time though, I’m going to try listen to podcasts less & observe my surroundings more. I am doing this (plus PT) to rehab my knee mostly. I slept for 12h yesterday night :)

Asyncio deadlock

I don’t have enough experience with the pitfalls of concurrent programming where you have to use synchronization techniques. I had my first deadlock today, and after a few minutes realized it was actually an infinite recursion from a typo. I need to get a better theoretical understanding of both event loop based async programming and synchronization methods. I’ve used them with threading & Java, but feel shaky in asyncio.

simperviser now has 100% unit test coverage. But it combines asyncio, processes & signals - so that doesn’t give me enough confidence as it might have otherwise. I’ll take it though :)

VSCode customization

I’ve been re-reading the pragmatic programmer again (after initially reading it about 12 years or so ago). A lot of it still holds up, although some stuff is date (love for Broken Window policing & perl). It reminded me that I hadn’t really spent much time customizing and being more productive in VSCode, so am spending time today doing that.

I switch between vscode and my terminal quite a bit, mostly for git operations and running tests. I’m going to see if I can stay inside vscode comfortably for running pytest based tests.

It made me very sad that the only thing I wanted from the pytest integration in vscode is something the maintainers aren’t actively working on - shortcut to run test the cursor is currently at. I also can’t seem to see test output directly.

I think I’ll be using the Terminal for pytest runs for now. I’m not even going to try with git.

If I was younger and not already full of projects to do, I’d have picked up and tried to make a PR for this. Boo time commitments.

Readyness check

I rallied late in the day & wrote some code around readyness checks in simpervisor. I don’t fully understand what I want it to do, but I’m going to look at what kubernetes does & try to follow that. Since this is being written for nbserverproxy, I am also going to try port nbserverproxy to simpervisor to see what kind of API affordances I’m missing. Primarily, I feel there should be a lock somewhere, but:

  1. I don’t have a unified theory of what needs locking & why
  2. I don’t know if I need a lock or another synchronization mechanism
  3. I don’t know how it’ll actually be used by the application

So designing by porting nbserverproxy seems right.


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