Vlad Kosinov vladkosinov

NGINX and Certbot example with CloudFlare API in Docker

Sample config files to demonstrate seup that creates and updates free SSL certificates from Let's Encrypt given that the domains are maintained at CloudFlare service.

How it works

Certbot verifies domains ownership by accessing CloudFlare API that adds temporary TXT DNS records. To enable it You must provide your CloudFlare API token. More details in documentation for dns-cloudflare Certbot plugin.

Certbot saves created certificates in Docker volume certbot_etc. Pay attention to output of the certbot run - it mentions path to the created certificates.

The purpose of this document is to get you familiar with the concepts and command line tools involved with connecting to the internet using modern 4G LTE modems on both Debian/Ubuntu and OpenWRT.

This writeup is based on my experiences with the Sierra Wireless AirPrime MC7455 modem and a Calyx (Sprint) SIM card, but it should apply to most modern 4G LTE modems.

High level overview

These are the steps required:

Physically connect antennas

Enable tab completion for JSX with Emmet in Atom

This guide assumes you have the emmet and language-babel packages already installed in Atom

Open the keymap.cson file by clicking on Atom -> Keymap… in the menu bar
Add these lines of code to your keymap:

'atom-text-editor[data-grammar~="jsx"]:not([mini])':

Name	Price	Integrations	Limits	Language
bugsnag.com	$29 per month	slack, jira	5 devs	javascript, php
speedcurve.com	$0.01 per check	slack, jira	-	javascript
honeybadger.io	$44 per month	slack, jira	5 projects	javascript
atatus.com	$29 per month	slack, jira	200000 view/month	javascript
muscula.com	$14 per month	-	1 000 000 errors/month	javascript
exceptional.io	-	-

New ES6 Constructor Semantics and Usage Examples

Manual super: Alternative Design where subclass constructors do not automatically call superclass constructors

This Gist presents a new design of class-based object construction in ES6 that does not require use of the two-phase @@create protocol.

One of the characteristics of this proposal is that subclass constructors must explicitly super invoke their superclass's constructor if they wish to use the base class' object allocation and initialization logic.

An alternative version of this design automatically invokes the base constructor in most situations.

Better local require() paths for Node.js

Problem

When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:

const Article = require('../../../../app/models/article');

Those suck for maintenance and they're ugly.

	// Demo: converting a thenable to a Promise

	const fulfilledThenable = {
	then(reaction) {
	reaction('hello');
	}
	};
	const promise = Promise.resolve(fulfilledThenable);
	console.log(promise instanceof Promise); // true
	promise.then(x => console.log(x)); // hello

	See my DASH-IF presentation from October, 2014:
	https://s3.amazonaws.com/misc.meltymedia/dash-if-reveal/index.html#/

	1. encode multiple bitrates with keyframe alignment:
	ffmpeg -i ~/Movies/5D2_Portrait.MOV -s 1280x720 -c:v libx264 -b:v 1450k -bf 2 \
	-g 90 -sc_threshold 0 -c:a aac -strict experimental -b:a 96k -ar 32000 out.mp4

	My input was 30 fps = 3000 ms. If it were 29.97, then a GOP size of 90 frames will yield a base segment
	size of 3003 milliseconds. You can make the segment size some multiple of this, e.g.: 6006, 9009, 12012.

	import { Component } from "React";

	export var Enhance = ComposedComponent => class extends Component {
	constructor() {
	this.state = { data: null };
	}
	componentDidMount() {
	this.setState({ data: 'Hello' });
	}
	render() {

	## within current branch, squashes all commits that are ahead of master down into one
	## useful if you merged with upstream in the middle of your commits (rebase could get very ugly if this is the case)

	## commit any working changes on branch "mybranchname", then...
	git checkout master
	git checkout -b mybranchname_temp
	git merge --squash mybranchname
	git commit -am "Message describing all squashed commits"
	git branch -m mybranchname mybranchname_unsquashed
	git branch -m mybranchname