Serverless Hero

Lee Gilmore leegilmorecode

Serverless Hero

leegilmorecode / get-note-types.vtl

Created July 15, 2021 11:53

VTL showing pulling through an array of objects using substitutions

leegilmorecode / serverless.js

Created July 15, 2021 11:50

serverless.js file showing importing values from JS files into the substitutions property

	/* eslint-disable no-undef */
	const { getNoteTypes } = require("./src/note-types/get-note-types");
	const { getErrorTypes } = require("./src/error-types/get-error-types");
	const { getErrorMessages } = require("./src/error-messages/get-error-messages");

	const serverlessConfiguration = {
	service: "serverless-appsync-i18n",
	frameworkVersion: "2",
	plugins: ["serverless-appsync-plugin"],
	provider: {

leegilmorecode / get-note-request.vtl

Created July 15, 2021 11:48

Example VTL showing substitutions and placeholders

	#if($ctx.args.noteId == 0)
	$utils.error($util.str.toReplace("${invalidValueErrorMessage}", "{0}", "$ctx.args.noteId"), "${invalidValueErrorType}")
	#else
	{
	"version" : "2017-02-28",
	"operation" : "GetItem",
	"key" : {
	"noteId" : { "S" : "${context.arguments.noteId}" },
	},
	"consistentRead" : true

leegilmorecode / getErrorTypes.js

Created July 15, 2021 11:45

Basic example function which returns the correct config values based on locale

	function getErrorTypes(locale = "uk") {
	const errorTypes = {
	uk: {
	noDataErrorType: "NoData",
	accessDeniedErrorType: "AccessDenied",
	invalidValueErrorType: "InvalidValue",
	},
	fr: {
	noDataErrorType: "PasDeDonnées",
	accessDeniedErrorType: "AccèsRefusé",

leegilmorecode / getErrorMessages.js

Created July 15, 2021 11:44

Basic JS function to return the write config based on locale

	function getErrorMessages(locale = "uk") {
	const errorMessages = {
	uk: {
	noDataErrorMessage: "No data",
	accessDeniedErrorMessage: "Access denied",
	invalidValueErrorMessage: "The value {0} is invalid",
	},
	fr: {
	noDataErrorMessage: "Pas de données",
	accessDeniedErrorMessage: "Accès refusé",

leegilmorecode / serverless.yml

Created July 13, 2021 09:37

Serverless Lambda Destinations

	service: serverless-lambda-destinations
	provider:
	name: aws
	runtime: nodejs12.x
	lambdaHashingVersion: 20201221
	memorySize: 128
	stage: ${opt:stage, 'develop'}
	region: eu-west-1
	apiGateway:
	shouldStartNameWithService: true

leegilmorecode / handler.js

Created June 27, 2021 14:29

Example of a lambda handler using the AWS AppConfig Lambda Layer Extension.

	/* eslint-disable no-undef */
	const axios = require("axios");

	const {
	STAGE: stage,
	APPLICATION: application,
	ENVIRONMENT: environment,
	CONFIGURATION: configuration,
	} = process.env;

leegilmorecode / serverless.yml

Created June 27, 2021 14:26

Example of AWS AppConfig alongside the Serverless Framework for the use of Feature Flags

	service: serverless-feature-flag
	provider:
	name: aws
	runtime: nodejs12.x
	lambdaHashingVersion: 20201221
	memorySize: 128
	stage: ${opt:stage, 'develop'}
	region: eu-west-1
	apiGateway:
	shouldStartNameWithService: true

leegilmorecode / serverless.ts

Created June 19, 2021 14:37

Example base serverless.ts file when autogenerated using the CLI

	import type { AWS } from "@serverless/typescript";

	import hello from "@functions/hello";

	const serverlessConfiguration: AWS = {
	service: "test",
	frameworkVersion: "2",
	custom: {
	webpack: {
	webpackConfig: "./webpack.config.js",

leegilmorecode / alarms.ts

Created June 19, 2021 14:19

Bespoke IaC configuration depending on stage being deployed

	import { config } from "@shared/config";
	import { Stages } from "@models/Stages";
	import hello from "@functions/hello";

	export const configureAlarms = () => {
	// only add alarm if prod or staging
	if (config.stage === Stages.prod \|\| config.stage === Stages.staging) {
	return {
	HelloFunctionErrorAlarm: {
	Type: "AWS::CloudWatch::Alarm",