tsmx

var express = require("express");
var app = express();

const setMyInfo = (text) => {
  return (req, res, next) => {
    req.myInfo = text;
    next();
  };
};

tsmx

Counter: React component for animated counting up

Small React component for counting numbers up to a certain value in a specified duration in ms. Useful for creating animated dashboards etc.

Usage

<Counter countFrom={0} countTo={123} durationMs={400}/>

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# save as ./github/workflows/git-ci-build.yml
# make sure that 'test-coverage' generates the coverage reports (lcov)

name: git-ci-build

on:
  [push]

jobs:
  build:

tsmx

GCP Compute Engine instance template creation with multiple NIC's and health-check FW rule

An instance template with more than one NIC obviously can't be created in the GCP web console. But it could easily be achieved using the gcloud CLI with consecutive --network-interface options.

gcloud compute --project=YOUR_PROJECT instance-templates create multi-nic-vm-template --machine-type=e2-micro --network-interface=subnet=projects/YOUR_PROJECT/regions/europe-west3/subnetworks/my-subnet-1,no-address --network-interface=subnet=projects/YOUR_PROJECT/regions/europe-west3/subnetworks/my-subnet-2,no-address --maintenance-policy=MIGRATE --image=my-image-1 --image-project=YOUR_PROJECT --boot-disk-size=10GB --boot-disk-type=pd-standard --boot-disk-device-name=instance-template-1 --no-shielded-secure-boot --shielded-vtpm --shielded-integrity-monitoring --reservation-affinity=any --tags=allow-health-check

In this example I specified two subnets that belong to different VPC's.

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#!/bin/bash

# Creates time series dummy data in a CSV with random hourly values.
#
# timeseries: array of name|from|to for the time series
#  -> name: name of the series (string)
#  -> from: lower limit of the hourly values (number)
#  -> to:    upper limit of the hourly values (number)
# amount: number of hourly values to create for each series, 24 for one complete day, 24*365 for a year etc.
# startdate: date-time of the first hour

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Froggit weather station protocols for custom server

Example output and NodeJS server code snippet for a Froggit weather station when using an own custom server instead of predefined weather services.

My hardware:

• WH3000SE sensor
• DP1500 Dongle

Ecowitt protocol type

tsmx

CounterFunc: functional React component for animated counting up using standard hooks

Small functional React component for counting numbers up to a certain value in a specified duration in ms. Useful for creating animated dashboards etc.

Uses React hooks useEffect, useState and useRef. Good example on how to pass props to a useEffect hook without declaring them as dependencies and how to deal with setInterval in functional components.

Usage

<CounterFunc countFrom={0} countTo={123} durationMs={400} />

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const got = require('got');

// get 'url' and 'token'...

got.get(url), {
  responseType: 'json',
  hooks: {
    beforeRequest: [
      options => {
        options.headers['Authorization'] = 'Bearer ' + token;

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const got = require('got');
const stream = require('stream');
const fs = require('fs');
const { promisify } = require('util');
const pipeline = promisify(stream.pipeline);

// instantiate the download stream - use options to set authorization header etc. if needed 
let downStream = got.stream('https://example.com/download');

downStream.on('response', response => {

tsmx

nginx as a proxy to avoid CORS during development

A simple setup for using nginx to avoid CORS errors during local development without the need of code changes.

Local dev situation

Let's assume you are developing a frontend and a backend service belonging together. It's a good practice to have those two projects separated to decouple development, deployment, patching etc.

At the end, both parts mostly would run under one domain but in different contexts, e.g.: