TL;DR: startSpan is easier and measures a duration. Use it if your work won’t create any subspans. startActiveSpan requires that you pass a callback for the work in the span, and then any spans created during that work will be children of this active span. I’m instrumenting a Node.js app with OpenTelemetry, and adding some …
It also works with VSCode devcontainers and on GitPod. Because Step 1 in any new project is a reproducible development environment, and Step 2 is get it in production. Step 3 is implement something. Copy this code: systemsthinking-dev/poker-in-elm at starter (github.com) This is my accomplishment for the day, so I’m here to share it with …
Today I need to do some calculations for an article, so I want to persist them. The best way to do this is in a notebook, in Python. This Jupyter notebook thing that is exactly what I need. And VSCode recently added support for it! The installation instructions for Jupyter are all like “anaconda” and …
This is an experience report for my future reference (and yours). The OpenTelemetry Collector is useful for receiving trace data in whatever format and exporting it to the back-end of your choice for storage and querying. For instance, I wanted to receive traces over HTTP/JSON from this sneaky browser extensionLINK and send them to Honeycomb. …
Sometimes the obvious, default API is never what you want. That’s when you have to memorize the “do things right” flag. For yargs, the command-line argument parser for Node.js, specify options and subcommands like this: There. Next time I can cut and paste this instead of scouring the internet for how to make yargs do …
If you want secure code, or code with fewer bugs, you want to track the kind of data you’re passing around. In your code, do not pass around strings or any other built-in built-in primitive type. Those are for the edges: we have to accept strings as input, we have to write VARCHAR to the …
Read moreSpring and JPA: use custom value types inside entities with a custom converter
I like this enough that I’m putting it here for reference. If anyone tells me how to improve it, I’ll update it here. The goal is to get some text to have a blurry white background behind it, like this text here. That’s especially useful when there’s an image behind it. Look! A CSS custom …
(this is my TL;DR from Karl Popper’s Three Worlds model) World 1: the physical world. This includes all material objects, light, magnetic fields, the universe. We all share one physical world, although each of us sees a tiny slice of it. World 2: human experience. Feelings, emotions, the way it is to be in your …
When I’m developing on a Spring Boot app, I want to see when a request comes in, how it was authenticated, and where it was handled. By default, log levels are set to INFO. Nothing prints per-request. I don’t know a good way to get the information I need, so I turn them way up: …
^ that’s what I googled, so that’s the title of the blog post that solves it. When I added spring-boot-starter-security to my dependencies, I expected my whole app to suddenly be behind a login screen. But I expected it to work after logging in. Instead, it failed at the first form submission. And it failed …
Read moreI turned on Spring Security and my POSTs don’t work anymore