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paulswail / cicd-pipelines.ts
Last active Jul 10, 2019
Create CICD pipelines for serverless services using AWS CDK
View cicd-pipelines.ts
// /stacks/cicd-pipelines.ts
// CDK app which creates a stack using a set of service definitions
import 'source-map-support/register';
import { App } from '@aws-cdk/cdk';
import { ServiceCicdPipelines } from '../lib/cicd/pipelines';
import { deploymentTargetAccounts } from './config';
import services from './services';
const app = new App({
paulswail /
Last active Jan 18, 2019
Invalidate CloudFront Distribution cache using only its origin domain name (AWS CLI)
CLOUDFRONT_DOMAIN="" # change this
# Get Distribution ID (requires node.js to be installed)
DISTRIBUTION_ID=$(aws cloudfront list-distributions --query "DistributionList.Items[].{Id: Id, DomainName: DomainName, OriginDomainName: Origins.Items[0].DomainName }[?contains(OriginDomainName, '$CLOUDFRONT_DOMAIN')] | [0]" | node -pe "JSON.parse(require('fs').readFileSync('/dev/stdin').toString()).Id")
# Invalidate cache
echo "Invalidating CloudFront distribution $DISTRIBUTION_ID ..."
aws cloudfront create-invalidation --distribution-id=$DISTRIBUTION_ID --paths '/*'
paulswail / compound-growth.js
Last active Jun 7, 2018
Calculate investment's compound growth
View compound-growth.js
// Calculates the compound growth of an investment over number of periods.
// Assumes fixed regular contributions and average growth rate.
function compoundGrowth(startingBalance = 0, periodContribution = 100, periodGrowthRate=0, nPeriods = 1, currencyLabel = '£') {
const totalContribution = startingBalance + periodContribution * nPeriods;
const finalBalance = [...Array(nPeriods)].reduce((runningBalance) => {
return runningBalance + (runningBalance * periodGrowthRate) + periodContribution;
}, startingBalance);
const absoluteGrowth = finalBalance - totalContribution;
const relativeGrowth = absoluteGrowth / totalContribution;
console.log(`${currencyLabel}${finalBalance.toFixed(2)} will be returned after ${nPeriods} periods with ${currencyLabel}${periodContribution.toFixed(2)} contributed each period and an average period growth rate of ${periodGrowthRate * 100}% and initial lump sum of ${currencyLabel}${startingBalance}.
paulswail / gist:842af71cbc5c42b075a8
Created Mar 9, 2016
Promise rethrow inside catch
View gist:842af71cbc5c42b075a8
function rethrowTest() {
Promise.resolve(true).then(function() {
return new Promise(function(resolve, reject) {
reject(new Error('BOOM!'));
}).catch(function(err) {
console.error('First catch: ' + err);
throw err;
}).then(function() {
console.log('I should not be printed');
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