Herman hermanbanken

Multicast

Golang channels are not multicast, but it can be done using a sync.Cond & a sync.Mutex. This package defines a MulticastStream which captures events and broadcasts them. It also caches the events so subscribers can replay!

Jest hoisting

This repo shows that hoisting (moving jest.mock calls to the top) does not work when you use manual mocks, Jest 21.0 & ts-jest 21.0.

Pods IDs are random

For an A/B testing experiment we needed a random component. The Kubernetes Pod ID is random, but is it random enough? I set out to discover.

First I downloaded a list of Pod ids:

kubectl get pods -o=custom-columns=NAME:.metadata.name --sort-by=.metadata.name > pods.txt

Without Docker

Compare A:

sh make-certs.sh
(nvm use 8.12 && PORT=44330 node server.js) &
(nvm use 8.12 && PORT=44330 node client.js)

with B:

Veneur

Veneur (maintained by Stripe and used in production) is a drop-in replacement for the DataDog agent.

Why Veneur

Because Datadog does not support global aggregates.

Why package

This package is used to build Veneur, as https://github.com/stripe/veneur is not published on Docker hub and

	FROM nginx:alpine AS builder

	# nginx:alpine contains NGINX_VERSION environment variable, like so:
	# ENV NGINX_VERSION 1.15.0

	# Our NCHAN version
	ENV NCHAN_VERSION 1.1.15

	# Download sources
	RUN wget "http://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz" -O nginx.tar.gz && \

	node_modules
	cpplib
	*.js
	*.d.ts

	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8" />
	<meta http-equiv="refresh" content="0; http://nstrein.example.org/" />
	<title>NS Trein</title>
	</head>
	<body>
	If you see this it means that your browser has both JavaScript and meta-refresh disabled.
	<script>