mdlavin’s gists

mdlavin / null-payload-article-patched-serverless-pseudocode.js

Last active June 15, 2018 18:08

A patched version of serverless-http to log falsy errors

	export.handler = function (evt, ctx, callback) {
	Promise.resolve()
	.then(() => {
	// Unmodified handler execution
	})
	.then(koaResponse => {
	// Unmodified success handling
	})
	.catch(e => {
	if (!e) {

mdlavin / null-payload-article-finish-pseudocode.js

Created June 15, 2018 19:25

Pseudocode for the AWS Lambda InvokeManager.finish function

	class InvokeManager {
	finish(err, data, waitToFinish) {
	if (this._result === undefined) {
	if (err == null) {
	this._result = [null, JSON.stringify(isUndefined(data) ? null : data)];
	} else {
	let errType = this._faulted ? 'unhandled' : 'handled';
	this._result = [errType, stringifyError(errType, err)];
	}
	}

mdlavin / null-payload-article-beforeExit-listener-line.js

Created June 29, 2018 21:07

The beforeExit listener registered by the AWS Lambda runtime

process.on('beforeExit', () => invokeManager.finish(null, null, false));

mdlavin / null-payload-article-promise-that-does-not-resolve.js

Created July 5, 2018 18:41

An example application that terminates without error earlier than expected

	function someAsyncFunction () {
	return new Promise(function () {
	// This is a bad promise that never resolves
	});
	}

	someAsyncFunction()
	.then(function () {
	console.log('Done');
	})

mdlavin / null-payload-article-promise-wrapper.js

Created July 5, 2018 19:10

A helper to make sure that a Promise will always resolve

	function safePromise (promise, timeout) {
	let slowOpId;

	const slowLoggingPromise = pFinally(promise, function () {
	if (slowOpId) {
	log.warn({slowOpId, itemKey}, 'The Promise eventually resolved');
	}
	});

	// Don't wait on longer than `timeout` ms for the Promise

mdlavin / graphql-apollo-xray-error-formatter.js

Last active January 19, 2022 18:50

An Apollo Server formatError function that avoids "Converting circular structure to JSON" errors

	// This is the attribute that continuation local storage uses to hold onto
	// the current context. The value comes from https://github.com/othiym23/node-continuation-local-storage/blob/fc770288979f6050e4371c1e1b44d2b76b233664/context.js#L11
	const CLS_CONTEXT_ATTRIBUTE = 'error@context';

	// A formatError function that can be used with
	// https://www.apollographql.com/docs/apollo-server/features/errors#for-the-client-response
	function formatError (err) {
	// The continuation-local-storage module attaches a context attribute to
	// errors so that the context can be resolved from errors. The attribute
	// is enumerable by default and so it gets included in GraphQL error

mdlavin / amplifyPush.sh

Last active July 6, 2022 08:33 — forked from swaminator/amplifyPush.sh

The amplifyPush script (Pulled on 12/27/2019)

	#!/usr/bin/env bash
	set -e
	IFS='\|'

	help_output () {
	echo "usage: amplify-push <--environment\|-e <name>> <--simple\|-s>"
	echo " --environment The name of the Amplify environment to use"
	echo " --simple Optional simple flag auto-includes stack info from env cache"
	exit 1
	}

mdlavin / amplify-custom-auth-domain-app.js

Created January 23, 2021 19:45

Amplify Custom Auth Domain Config Update

	import awsconfig from "./aws-exports";
	import Amplify from "@aws-amplify/core";

	// Find the User Pool ID for your production deployment in
	// the AWS Console
	if (awsconfig.aws_user_pools_id === "us-east-1_M7n6RNrq9") {
	awsconfig.oauth.domain = "auth.yourdomain.com;
	}

	Amplify.configure(awsconfig);

mdlavin / backend-config.json

Last active January 23, 2021 20:38

Amplify custom auth domain backend-config.json

	{
	"auth": {
	"domain": {
	"providerPlugin": "awscloudformation",
	"dependsOn": [
	{
	"category": "auth",
	"resourceName": "CognitoResource",
	"attributes": [
	"UserPoolId"

mdlavin / template.yml

Created January 23, 2021 20:37

Amplify custom auth domain template.yml

	AWSTemplateFormatVersion: 2010-09-09

	Parameters:
	env:
	Type: String
	authCognitoResourceUserPoolId:
	Type: String

	Mappings:
	CustomAuthDomains:

Matt Lavin mdlavin