Alexander Zeitler AlexZeitler

Stubbing Lambda Functions in your CDK Stack

Given you have a stack with one or more Lambda functions (e.g. as part of a Step Functions state machine), it can be pretty useful to stub long running parts with a known response.

This makes use of cdk Aspects, which allows modifying all or a filtered subsset of resources for a given scope (Stack, Construct).

In addition this leverages raw overrides to remove the original code of the Lambda function.

Please note, that the stub has to be in Python or NodeJS, since inlining code is only supported by those runtimes.

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	namespace Newtonsoft.Json.Converters

	open Microsoft.FSharp.Reflection
	open Newtonsoft.Json
	open System

	type IdiomaticDuConverter() =
	inherit JsonConverter()

	[<Literal>]

	// Single case union
	[<Struct>] type MHPI = MHPI of double

	// An entity that contains SCU
	type Entity = {
	Foo: string
	Bar: MHPI
	}

	// JSON.NET Converter

	namespace Infrastructure

	open System.Text.Encodings.Web
	open System.Text.Json
	open System.Text.Json.Serialization

	[<RequireQualifiedAccess>]
	module JsonSerializer =
	let private setupOptions (options: JsonSerializerOptions) =
	options.PropertyNamingPolicy <- JsonNamingPolicy.CamelCase

	// ========= Event Sourcing in a nutshell

	(*
	FriendlyName: string
	Aggregate friendly name.

	Initial: 'State
	Initial (empty) state we will start with.

	Decide: 'Command -> 'State -> 'Event list

	module App

	open Elmish

	type State =
	{ CurrentUser: string option }

	type Msg =
	\| SignIn of string
	\| SignOut

	swagger: '2.0'
	info:
	title: Siren API
	description: Template for a Siren API
	version: '0.1.0'
	schemes:
	- http
	- https
	basePath: /
	produces:

	'use strict';
	class Abstract {
	// A static abstract method.
	static foo() {
	if (this === Abstract) {
	// Error Type 2. Abstract methods can not be called directly.
	throw new TypeError("Can not call static abstract method foo.");
	} else if (this.foo === Abstract.foo) {
	// Error Type 3. The child has not implemented this method.
	throw new TypeError("Please implement static abstract method foo.");