Kieran kieranajp

Scaling @ HelloFresh

API Gateway

Why did we need an API Gateway?

^ Italo ^ As we move to microservices, and break up monoliths, we need to be able to seamlessly route requests to the right place ^ Each service should not care about auth, rate limiting, etc. so we can offload this to the gateway

MicroXchg 2017

## Resilient functional service design

The problem

you don't make any money until you go to production
you don't make any money unless your software is available & responsive
distributed systems change the rules of making it robust - throwing money at hardware is no longer enough
Failure is now the norm, it's unpredictable, it's going to get worse. Don't try to avoid failures, accept they'll happen

The traditional way of doing async in JS was with callbacks:

function doSomethingThatTakesAWhile(callback) {
    // blah blah blah doing some work that will take a few seconds

    // We'll simulate this taking a while with the timeout
    setTimeout(function () {
        callback('done');
 }, 5000)

	#!/usr/bin/env bash

	function usage {
	echo "An easy way to look at multiple data items in a Kubernetes secret."
	echo " Usage: $(basename $0) <secret> <data ...>"
	exit 1
	}

	if [[ $# -eq 0 ]] ; then
	usage

	apiVersion: batch/v1beta1
	kind: CronJob
	metadata:
	name: cron
	spec:
	schedule: "/1 * * *"
	jobTemplate:
	spec:
	template:
	spec:

	#!/bin/bash

	connect=1

	while getopts "d" opt; do
	case "$opt" in
	d)

	#!/bin/bash

	##########
	# Run this to use a cached version of node_modules stored on Amazon S3.
	# If npm-shrinkwrap has changed, the cache is updated.
	#
	# Ensure the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environtment variables are set
	# Then run the script.
	#
	# Example:

	#!/bin/sh

	PRE_COMMIT="$(cat <<'EOF'
	#!/bin/sh

	PROJECT=`php -r "echo dirname(dirname(dirname(realpath('$0'))));"`
	STAGED_FILES_CMD=`git diff --cached --name-only --diff-filter=ACMR HEAD \| grep \.php`

	# Determine if a file list is passed
	if [ "$#" -eq 1 ]

	FROM golang:1.7.1-alpine

	RUN apk --update add make \
	&& rm -rf /var/cache/apk/*

	#!/bin/bash

	# Slack Info
	webhook_url="" # Put your Slack webhook URL here
	channel="#general"

	# Deploy info
	server="" # Staging, production etc.
	check_url="" # Link within the message body
	application_name="" # Name of your application