David Ohana – Medium

Published in ITNEXT

·Dec 22, 2021

Better safe than worry: log the versions of all dependencies at runtime

In short: Tutorial for how to easily get the versions of log4j2 and the rest of your Java dependencies at runtime. In the light of the recent log4j2 vulnerability, it happens frequently that you have to upgrade a version of some 3rd-party dependency in order to mitigate a recently discovered…

Java

4 min read

On the Safe Side: Log your 3rd-party Package Versions

Nov 21, 2021

10 “Do It Yourself” Tips for Machine Learning Experiment Tracking and Reproducibility

This post was also published in the IBM Developer Blog. As machine-learning practitioners, we invest significant time and effort to improve our models. You usually do it iteratively and experimentally, by repeatedly changing your model, running an experiment, and examining the results, deciding whether the recent model change was positive…

Machine Learning

9 min read

Nov 8, 2020

Avoiding Bash frustration — Use Python for shell scripting

I never got used to Bash programming syntax. Whenever I have to write a more-than-trivial bash script, the strange syntax annoys me, and I have to Google every little thing I need to do, starting from how to do comparisons in if statements, how to use sed , etc. For…

Python

3 min read

Published in The Startup

·Nov 2, 2020

Simple Runtime Profiling of Batch Jobs in Production

So, you have a batch processing / ETL task that receives some data in a loop or per request and crunches it. It might even be running in production. …

Profiling

4 min read

Published in The Startup

·Oct 15, 2020

Code-First Configuration Library for Kotlin

GitHub repo: https://github.com/davidohana/kofiko-kotlin Preface Kotlin and Python are my favorite programming languages. After publishing Kofiko configuration library for Python, I decided to work on a port of it for Kotlin. Actually the porting to Kotlin took significantly more effort, for many reasons. I wanted to introduce better extensibility architecture this time…

Kotlin

2 min read

Published in The Startup

·Jun 28, 2020

Code-First Configuration approach for Python

GitHub repo: https://github.com/davidohana/kofiko-python PyPi package: https://pypi.org/project/kofiko In the Code-First approach, you first define your data-model in plain code. You can start working with that model immediately, and only later you worry about schema definitions, bindings, and other necessities. …

Python

4 min read

Jun 17, 2020

Grafana & Generic OAuth — How to restrict access to specific authenticated users?

If you have successfully integrated Generic OAuth with Grafana, you might wonder as I did, how do you allow only specific authenticated users from your organization to access Grafana? and how do you set different access rights (admin, editor, viewer) to those users? The first thing we need to do…

Authentication

2 min read

How to restrict user access with to Grafana with Generic OAuth

May 25, 2020

Never stop trying: Retry on Exception in Python

(Full code and samples for this post at my GitHub Repo) Suppose you have the following code which invokes a gRPC request and may fail due to various network conditions. How to retry this call until no exception raised? Wrap the call in an inner(inline) named function and use…

Python

1 min read

Published in Analytics Vidhya

·May 24, 2020

Python Logging: Colorize Your Arguments!

The latest full code and samples for this article are available under the Apache-2.0 license at my GitHub Repo. Yes, we love logging in colors. Yes, there are many Python libraries and sample code that show you how to colorize your stdout log messages by logging level. But I am…

Python

3 min read

May 20, 2020

Layered Python ConfigParser wrapper with support for environment vars

The full code (library + example + .ini files) for the following article are available at GitHub : https://github.com/davidohana/LayConf In every programming language I use, one of the first thing I need is a decent configuration library. My requirements are usually: Default (hard-coded) configuration Custom configuration file Ability to override…

Python

2 min read