MichaelDrogalis

I've been working with Apache Kafka for over 7 years. I inevitably find myself doing the same set of activities while I'm developing or working with someone else's system. Here's a set of Kafka productivity hacks for doing a few things way faster than you're probably doing them now. 🔥

• Show me all my Kafka topics and their partitions, replicas, and consumers
• Show me the contents of a topic
• Create a Kafka topic
• Produce messages to a Kafka topic
• Validate the schema of messages before producing to a topic
• Do all of this at a distance

Get the tools

mscharley

# vim: set filetype=dockerfile :
FROM node:10.13-alpine as build

ENV TERM=dumb \
    LD_LIBRARY_PATH=/usr/local/lib:/usr/lib:/lib

# Create a subuser so that NPM doesn't whine about running as root
RUN adduser -D -H -h /usr/src/app web && \
    mkdir -p /usr/src/app && \
    chown web:web /usr/src/app && \

Leonidas-from-XIV

module Let_syntax = struct
  let return = Lwt.return
  let (>>=) = Lwt.Infix.(>>=)
  let (>>|) = Lwt.Infix.(>|=)
  module Let_syntax = struct
    let bind m ~f = Lwt.bind m f
  end
end

naartjie

curl --request POST \
--url 'https://usX.api.mailchimp.com/3.0/lists/57afe96172/members' \
--user 'anystring:apikey' \
--header 'content-type: application/json' \
--data '{"email_address":"urist.mcvankab+3@freddiesjokes.com", "status":"subscribed"}' \
--include

jaredly

let recv = (client, maxlen) => {
  let bytes = Bytes.create(maxlen);
  let len = Unix.recv(client, bytes, 0, maxlen, []);
  Bytes.sub_string(bytes, 0, len)
};

let parse_top = top => {
  let parts = Str.split(Str.regexp("[ \t]+"), top);
  switch (parts) {

fredeerock

Stop all containers:

• docker ps -aq | xargs docker stop

Remove all containers:

• docker ps -aq | xargs docker rm

Remove all images:

• docker images -aq | xargs docker rmi

Remove all networks:

joewalnes

import com.sun.net.httpserver.HttpServer
import java.io.PrintWriter
import java.net.InetSocketAddress

/**
 * Minimal embedded HTTP server in Kotlin using Java built in HttpServer
 */
fun main(args: Array<String>) {
    HttpServer.create(InetSocketAddress(8080), 0).apply {

trueadm

// Option C:
// this implementation has a small amount of overhead compared to (a) and (b)
const React = require('react');

const counterState = React.createStateReducer({
  initialState: props => ({
    counter: 0,
    divRef: React.createRef(),
  }),  
  reducer: (action, state) => {

busypeoples

Phantom types in ReasonML

Introduction

"A phantom type is a parametrised type whose parameters do not all appear on the right-hand side of its definition..." Haskell Wiki, PhantomType

The following write-up is intended as an introduction into using phantom types in ReasonML.

Taking a look at the above definition from the Haskell wiki, it states that phantom types are parametrised types where not all parameters appear on the right-hand side. Let's try to see if we can implement a similar example as in said wiki.

crittermike

# One liner
wget --recursive --page-requisites --adjust-extension --span-hosts --convert-links --restrict-file-names=windows --domains yoursite.com --no-parent yoursite.com

# Explained
wget \
     --recursive \ # Download the whole site.
     --page-requisites \ # Get all assets/elements (CSS/JS/images).
     --adjust-extension \ # Save files with .html on the end.
     --span-hosts \ # Include necessary assets from offsite as well.
     --convert-links \ # Update links to still work in the static version.