Markus Kolb - net4VISIONS Blog

net4VISIONS Blog

Markus Kolb

Rust macro for dyn Trait Clones

With this Rust macro... #[macro_export] macro_rules! box_dyn_clone { ($vis:vis, $name:ident, $t:ident) => { #[doc = "Cloneable `Iterator` trait"] $vis trait $name { #[doc = "Clones `Box`"] fn box_dyn_clone(&self) -> Box; } impl $name for T where T: 'static + $t + Clone, { fn box_dyn_clone(&self) ->

Be careful with mixing TypeScript and JavaScript

Be careful with mixing TypeScript and JavaScript

In TypeScript you can use the same private class features like in JavaScript since ES2021. So far so good. Depending on the compiler options target during compiling TS to JS there might be added some generated JS-code to handle private-fields in JS and this needs to be remembered when modifying

Website Kfzgutachter Online

Website Kfzgutachter Online

Die Websites des Kfzgutachters/Kfzsachverständigen Klügl sind online. Neben Landingpages zur lokalen und regionalen Kundeninformation (wie https://www.ingolstadt-kfzgutachter.de oder https://www.ingolstadt-kfzsachverständiger.de) gibt es auf der Website https://www.kfzgutachter-klügl.de die Möglichkeit Aufträge per Formular zu vergeben. https://www.kfzgutachter-in-ingolstadt.de https://www.kfzgutachter-kluegl.de https:

My Advent of Code in Rust

My Advent of Code in Rust

This December I code the really funny Advent of Code (AoC) puzzles using the Rust compiler language. The half is over It is Mon, December 13th and the first half of puzzle pairs is over. Today I had to provide some coding solution to fold Origami to a paper, seeing

Rocket with local git checkout

Rocket with local git checkout

At the moment you should start development with the Rust Rocket framework at the 0.5-RC versions. There has been many changes to the latest stable 0.4 version and the new release is awaited soon. To stay up-to-date at the release cycle I think it is a good idea

Donaukurier Sudoku 07/14/2021

Donaukurier Sudoku 07/14/2021

For winning 25€ in the Sudoku of our newspaper Donaukurier there is a chance up to midnight. ;-) I've optimized my rsudoku application to be as fast as 0.006 seconds to solve the Donaukurier Sudoku from the last post.

Daily Sudoku of Donaukurier cracked

Daily Sudoku of Donaukurier cracked

I'm currently fiddling around with a Sudoku puzzle solver implemented in Rust language. At the moment it needs some more optimizing in handling very difficult grid templates with an acceptable memory footprint. But it is fast enough for the daily Sudoku puzzle in our newspaper Donaukurier. After the code profiling

Permutate vector values

Permutate vector values

There is my Rust Playground to an iterative and the looping variants of vector permutation in Rust language. As known the iterative variant is a little bit faster.

Howdy - Face authentication for Linux

Howdy - Face authentication for Linux

A few days ago I've added a little bit of OpenCV-based Artificial Intelligence to my Linux laptop. I've been wondering about the password prompt and ever and ever typing in this password after resume from sleep. But auto-login without password doesn't seem to be a good idea for a laptop.

Rustlings 4.4.0 exercises

Rustlings 4.4.0 exercises

A boring week started and I used the time for trying out Rustlings. These are small exercises to get you used to reading and writing Rust code. Quite interesting how this tool works and gives you some hints on features of Rust. Got it successfully finished in short time. > rustlings

Load your rusty Cargo

Load your rusty Cargo

There exist some comfortable must-have add-ons for the Rust programming language crate package manager Cargo. Check if you have them installed with command cargo --list! 1. cargo-audit Audit Cargo.lock files for crates with security vulnerabilities reported to the RustSec Advisory Database. 2. cargo-deny cargo-deny is a cargo plugin that

Inspace ARISS SSTV Diploma

Inspace ARISS SSTV Diploma

With my SSTV radio activity (see here) I've received an Inspace ARISS SSTV Diploma by the Indonesian Space Explorer Club https://www.inspace.club/ for my receive of the SSTV shot 7/12 on January 28th 2021 by International Space Station station RS0ISS. Many thanks for the organisation and the

International Space Station SSTV part 2

International Space Station SSTV part 2

Today, Friday, Jan 29th 2021 is the 2nd day of the ISS project Inter-MAI-75 in transmitting SSTV via 2m Amateurradio band around frequency 145.800MHz. See also part 1 of the story... I think the idea of the transmitted pictures is the memento to the Salyut 7 Space Station. 30

ISS International Space Station SSTV

ISS International Space Station SSTV

Today the International Space Station (ISS) has done some SSTV transmissions on 145.800MHz downlink. Update: For part 2 see here! Slow-scan television (SSTV) is a picture transmission method, used mainly by amateur radio operators, to transmit and receive static pictures via radio in monochrome or color. A literal term

Use container healthcheck for security

Use container healthcheck for security

Docker containers provide the healthcheck feature, which can be scripted individually for every container. The official use case is to check if the service(s) is/are responding and working correctly in the container. But it is also important that your container is secure. It is never a good idea

TLS Cert and Key for jetty

TLS Cert and Key for jetty

Today with jetty 9.4.34 and you'd like to use the default keystore password storepwd and default private key password keypwd, so that you don't have to modify the config, and you have cert/key in common PEM format... tmpcert="/tmp/certkey$RANDOM.pkcs12" ; \ openssl pkcs12 -export -inkey "key.

Enable SSL/TLS in amavis for secure connections

Enable SSL/TLS in amavis for secure connections

If you have a multi-host email server setup or you won't trust all admin users, you should connect the TCP sockets of amavis encrypted with TLS. Or else people could sniff the email content transmitted from/to SMTP server to/from Amavis over the network. Amavis needs some additional perl

Create docker image from scratch

What is this about Docker Docker is a Platform-as-a-Service (PaaS) solution to run all kinds of applications in isolated containers. More information is available at https://www.docker.com/community-edition. Docker images Docker stores application data in so called images. These images provide the full runtime environment to execute the

XFCE Tumbler patch

XFCE Tumbler patch

I'm using XFCE Desktop as my working/development environment. It is fast and has all features I need. Allmost... There is a thumbnail service called Tumbler which creates these neat thumbnail icons for image and pdf files and some more files with viewable content. To create these thumbnails Tumbler needs

TypeError: failed to fetch

TypeError: failed to fetch

This can be caused because of browser engine doesn't detect offline state and web resources are nevertheless not fetch-able. This could happen because of server downtime or routing problems. In Workbox the responsible code looks like this... function s(t, e, i) { fetch(t).then((function(n) { 404 === n.status

Import assets in Quasar

Import assets in Quasar

Um ohne Fehler Bilddateien aus den Assets via import img10 from '../assets/time-10.svg'; zu laden, müssen folgende Einträge zum shims-vue.d.ts hinzugefügt werden: declare module '*.jpg' { const value: string; export default value; } declare module '*.png' { const value: string; export default value; } declare module '*.svg'

Shell script Quasar Framework Icons

Shell script Quasar Framework Icons

Mit dem folgenden Shell script werden alle notwendigen Icons für das Quasar Framework in den richtigen Größen und Formaten mit der Hilfe von ImageMagick erstellt. #!/bin/sh PATH="/bin:/usr/bin" script="`basename \"$0\"`" srcfile="`realpath -e \"$1\" 2>/dev/null`" if [ -z "$srcfile" ] ; then echo "$script: file not found

Warum man nicht zu kurze Variablen verwenden sollte

Warum man nicht zu kurze Variablen verwenden sollte

Gestern musste ich mich stundenlang auf die Suche im Netz nach einer Fehlermeldung von EclipseLink machen. Beim Aufruf von EntityManager.persist() in einem JUnit Test hieß es, dass meine Entity keine Entity wäre und ich kontrollieren sollte, ob ich die Klasse mit @Entity annotiert habe. Ja, natürlich hatte ich das.

Test von HTTPS Endpunkten mit hyper

Test von HTTPS Endpunkten mit hyper

hyper stellt eine schnelle HTTP Implementierung in Rust für Server und Clients zur Verfügung. Das Zusatz-Crate hyper-tls bringt die Implementierung von TLS mit. Aufsetzend auf die asynchrone Laufzeitumgebung Tokio benötigen wir für Tests auch das tokio crate. extern crate hyper; extern crate hyper_tls; extern crate tokio; use hyper::rt:

Progressbar für Cargo

Progressbar für Cargo

Mit dem gestrigen Release von Rust 1.30.0 hat der Crate (Library) Manager Cargo ein klitzekleines, aber richtig tolles Feature bekommen. Eine Progressbar ;-) Die zeigt an, wieviele Crates noch kompiliert werden müssen. Vorher war das eine unbekannt lange Liste und kein Ende in Sicht. Jetzt ist es viel