Gaetano Piazzolla GaetanoPiazzolla

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Sleep is for those without deadlines

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GaetanoPiazzolla / 4step-green-verification.java

Created October 27, 2021 19:07

	// 4 - create CborObject MAP and retrieve Kid and Signature
	CBORObject messageObject = CBORObject.DecodeFromBytes(outputStream.toByteArray());
	byte[] coseSignature = messageObject.get(3).GetByteString();
	byte[] protectedHeader = messageObject.get(0).GetByteString();
	byte[] content = messageObject.get(2).GetByteString();
	byte[] dataToBeVerified = getValidationData(protectedHeader, content);
	CBORObject unprotectedHeader = messageObject.get(1);
	byte[] kid = getKid(protectedHeader, unprotectedHeader);

	// ....

GaetanoPiazzolla / 5step-green-verification.java

Created October 27, 2021 19:14

	Signature signature = Signature.getInstance("SHA256withECDSA");
	signature.initVerify(key);
	signature.update(dataToBeVerified);
	coseSignature = ConvertToDer.convertToDer(coseSignature);
	if (signature.verify(coseSignature)) {
	System.out.println("Verified");
	} else {
	System.out.println("Not verified");
	}

GaetanoPiazzolla / index-1.js

Created October 28, 2021 15:53

	let btn = document.querySelector(".record-btn")

	btn.addEventListener("click", async function () {

	let stream = await navigator.mediaDevices.getDisplayMedia({
	video: true
	})

	//...

GaetanoPiazzolla / index-2.js

Created October 28, 2021 15:59

	let btn = document.querySelector("#record-button")

	btn.addEventListener("click", async function () {

	let stream = await navigator.mediaDevices.getDisplayMedia({
	video: true
	})

	let mediaRecorder = new MediaRecorder(stream, {
	mimeType: "video/webm"

GaetanoPiazzolla / index.html

Last active October 28, 2021 16:03

	<!DOCTYPE html>
	<html>
	<head>
	<title>Recorder</title>
	<meta charset="UTF-8"/>
	</head>
	<body>
	<div>
	<button id="record-button">RECORD</button>
	</div>

GaetanoPiazzolla / index.js

Last active October 28, 2021 16:15

	let btn = document.querySelector("#record-button")

	btn.addEventListener("click", async function () {

	let stream = await navigator.mediaDevices.getDisplayMedia({
	video: true
	})

	let mediaRecorder = new MediaRecorder(stream, {
	mimeType: "video/webm"

GaetanoPiazzolla / load-test.js

Created December 24, 2021 12:17

K6 test looping through 3 endpoints

	import http from 'k6/http';
	import { check, sleep } from 'k6';
	import { Trend, Rate } from 'k6/metrics';

	const getTrend = new Trend('Get Books');
	const getErrorRate = new Rate('Get Books error');

	const postTrend = new Trend('Add Book');
	const postErrorRate = new Rate('Add Book error');

GaetanoPiazzolla / GetBook.java

Created December 24, 2021 12:23

JDBC and R2DBC differences in "getAllRows"


	// JDBC
	@GetMapping(produces = MediaType.APPLICATION_JSON_VALUE)
	public ResponseEntity<List<BookDTO>> getAll() {
	UUID uuid = UUID.randomUUID();
	log.info("getAll() {} running", uuid);

	ResponseEntity<List<BookDTO>> list = ResponseEntity.ok(
	this.bookRepository.findAll().stream().
	map(mapper::toDto).collect(Collectors.toList()));

GaetanoPiazzolla / nginx.conf

Last active December 26, 2021 08:56

Nginx configuration for huge load of concurrent requests

	user nginx;

	# you must set worker processes based on your CPU cores, nginx does not benefit from setting more than that
	worker_processes auto;

	# number of file descriptors used for nginx
	worker_rlimit_nofile 100000;

	events {
	# determines how much clients will be served per worker

GaetanoPiazzolla / AddOrder.java

Created December 25, 2021 18:06

	// r2dbc
	public Mono<OrderDTO> addOrder(@RequestParam("bookIsbn") String bookIsbn, @RequestParam("firstName") String firstName) {
	return Mono.just(UUID.randomUUID()).flatMap(uuid -> {
	log.info("addOrder() {} running", uuid);

	Mono<User> user = userRepository.findByFirstName(firstName);
	Mono<Book> book = bookRepository.findByIsbn(bookIsbn);

	return Mono.zip(user, book).flatMap(zipFlux -> {
	log.info("addOrder() {} I've got user and book", uuid);