andywer

2018-08-20: Postgres failure

What happened

The PostgreSQL container stopped unexpectedly, was automatically restarted, but suddenly didn't accept any connections anymore. Neither from the API service containers nor from the Macbook over the internet.

Error in logs:

FATAL:  pg_hba.conf rejects connection for host "10.0.1.2", user "postgres", database "******", SSL off

andywer

kubectl config get-contexts

cd charts/satoshipay
helm dep up

andywer

import State from 'new-state-component'

const setName = name => prevState => ({ ...prevState, name })

const RenameDialog = ({ prevName, onRename }) => {
  return (
    <State initial={{ name: prevName }}>
    {(state, setState, memoize) => (
      <RenameDialogUI
        name={state.name}

andywer

Tree shaking

Webpack: Should work now™

Parcel: Still not implemented - parcel-bundler/parcel#392

Environment vars substitution

Webpack: EnvironmentPlugin / DefinePlugin

andywer

Traefik in Minikube using Helm

Install traefik to the cluster using helm.

helm install stable/traefik --set dashboard.enabled=true,imageTag=v1.6,serviceType=NodePort

Now edit the traefik dashboard service manually, since the traefik chart wants us to access the traefik dashboard via a custom domain. Since we run it locally in a VM, we will just expose the dashboard on the minikube IP on a custom port.

andywer

Migrating to webpack-blocks v1.0

Table of Contents

• Migrating configuration
• Additional features
• Migrating blocks

Migrating configuration

andywer

const fetchData = thread(require('worker-loader!./fetch-data'))
// or
const fetchData = thread(async url => {
  return (await fetch(url)).json()
})

// fetchData :: ThenableObservable

const data = await fetchData('/api/me')

andywer

This is a proposal for lightning talk at Reactive Conf. Please 🌟 this gist to push the proposal!

Memory Leak Testing in 2017

Hi, I am Andy, creator of leakage - the node-powered memory leak testing library.

Instead of manual debugging it provides a structured approach to fix or even prevent memory leaks.

andywer

// counter.js
import stateful from 'new-fancy-statefulness'

const Counter = (props, state, { setState }) => (
  <div>
    <div>Clicked {state.clicks} times</div>
    <button onClick={props.onClick}>Increase +</button>
  </div>
)

andywer

{
  "scripts": {
    "test": "mocha"
  },
  "engines": {
    "node": ">= 7.0"
  },
  "devDependencies": {
    "leakage": "./path/to/local/leakage/branch/feature/async-support",
    "mocha": "^3.2.0",