del.igh.tf/ul

BodyPix and OBS

Got BodyPix and OBS Studio Virtual Camera to work with minimum fuss. You'll need: a recent copy of v4l2loopback; you can compile it from source by cloning https://github.com/umlaeute/v4l2loopback.git a recent copy of OBS Studio; you can compile it from source by cloning https://github.com/

(more) WebAssembly

Some interesting WebAssembly tidbits, some new, some old: WebAssembly Text Format on MDN was a fun tutorial to follow, showing the innards of a WebAssembly module; Multi-value makes the stack-nature of the WebAssembly machine closer to what you'd expect if you've written code in e.g. Forth — actually removing an

WebAssembly

Of WebAssembly (and COBOL)

The running joke at the office is that I'm the only one old enough to ever take COBOL classes. My younger colleagues therefor insist on feeding me bits of COBOL news. I guess I might as well share! Of course the recent announcement by CloudFlare that they support COBOL on

MIDI

ALSA MIDI Sequencer as UDP Service (part 2)

My work on a libuv-driven ALSA MIDI Sequencer UDP Service has been going very well, and the service itself is working as expected. This past week I finished work on the ALSA MIDI topology interface, enumerating clients, ports, and subscriptions on the one hand, and connecting and disconnecting ports on

Create new bucket in Clever-Cloud Cellar (S3)

To use aws-sdk to create a new bucket in Clever-Cloud Cellar, you must set LocationConstraint to the empty string "". Otherwise the operation will fail with InvalidLocationConstraint. Full example (using Node.js) follows, replace … with your values. const AWS = require('aws-sdk'); AWS.config.update({accessKeyId: '…', secretAccessKey: '…

Node.js

ALSA MIDI Sequencer as UDP service

`alsa-lib` is used to interface with the ALSA MIDI Sequencer, while `libuv` is used to build the UDP component

authorization

Authorization

(How should I build proper authorization semantics for a complex dataset?) Take inspiration from GraphQL (especially Mutations) and micro-services and ask: what is the smallest usable operation? Design operations around security/authorization boundaries (instead of designing authorization around the operations). Differentiate in semantic terms: book.add.existing isn't book.add.

JavaScript

Parsing JSON numbers in ECMAScript

I've been worried about numbers and JSON for a while. Not that JSON has a problem: numbers are clearly specified, and in languages (such as Erlang) which support arbitrary precision out-of-the box, parsing JSON is not an issue. In ECMAScript however, JSON.parse will generate JSON numbers with the specification's

See The Sky

See the sky before you see the screen— JJ Tiziou

Node.js

Some options for Fastify

I've been experimenting with Fastify and I've enjoyed how it tightly integrates with JSON Schemas to validate both parameters sent to the server, and responses sent back to the client. The modules that made it into my toolbox so far are: fastify-sentry for integration with Sentry.io (it's worth reminding

Node.js

Getting WebAssembly to run in Node.js (v13)

I ran into errors while trying out WebAssembly instanciation in Node.js…