Davide Vernizzi

Sep 3, 2019

Faceswap and regulation

The Faceswap manifesto has a very interesting point when stating that “it was the first AI code that anyone could download, run and learn by experimentation without having a Ph.D.”. I think it actually is a great thing that such a powerful technology is easily available to everyone. The technology itself was existing even before this open source project, so keeping it reserved to few skilled people did not prevent misusage (especially because as most of IT technology, it comes with a low price to run, so the only barrier is often actually lack of knowledge).

Aug 6, 2019

On Signal

In this article Bruce Schneier (quite rightly) complains about the security of WhatsApp next features and the possible impact on society. At some point, he claims that “Of course alternatives like Signal will exist for those who don’t want to be subject to Facebook’s content moderation” and in one of the comments a reader says that “Deleting whatsapp and installing Signal (Or other) takes less than 5 minutes. There just isn’t any excuse anymore. Do it. Do it now. Right now”.

Aug 1, 2019

On business models

The recent events made me think a lot about business models. Modern services are most of the time non sense business model; the vast majority is either free, or ads supported, or subscription based. All of these models are not OK for most of the cases.

Jan 1, 2019

FizzBuzz in Clojure

Taking inspiration from this great post of fizzbuzz written in 10 languages, I have decided to write it in Clojure.

Jan 3, 2018

A (even) better git log

TL;DR:

Nov 6, 2017

A Little Docker Journey

I did my very first semi-seriuos test with docker; so far I’m pretty happy with what I have got. I have a small project, let’s call it superduper, composed of

frontend written in React
backend in Clojure which runs behind Apache Tomcat
database on MongoDB

Apr 3, 2017

Arbitrary Number Of parameters With Compojure

I wanted to create an API in CLokure/Compojure that accepted an arbitrary number or parameters. I’m using Luminus framework, and I have generated an app using the +service template, which creates a RESTful API (see here for details).

Mar 15, 2017

Running Luminus microservices using docker compose

I wanted to create a Luminus application that uses mongo as DB and that can be run using docker.

Jan 27, 2017

Emacs, luminus and nREPL

Create a new project with luminus (optional)

Dec 5, 2016

Routes in ClojureScript

I’m experimenting with Clojurescript; Clojurescript is wonderful (just as Clojure is) and with Reagent it is lots of fun. Unfortunately as for much of the Clojure-world there is not much documentation, but there is a very handy recipe book that together with the basic documentation should get you up and running.

Jan 26, 2016

Nested views with backbone and marionette

TL;DR; Create 2 models and 2 collections and 2 ItemView and 2 CollectionView

Nov 25, 2015

The impossible bug hunt

Recently I had to find a bug which has shown to be very nasty (not to mention not existent). One morning a customer called us claiming that one of our services was not working. The service is composed of two APIs: a SOAP one and a RESTful one. The problem was reported to affect the SOAP interface (even if a later analysis show that also the REST API was suffering from the same issue).

Oct 22, 2015

Learning RegExp

Knowing regexp is always a good tool. They can be useful for many tasks: from searching strings to manipulating texts. A fun way to learn regexp is by using this site; it basically is a crossword game where definitions are in facts regular expressions.

May 13, 2015

Testing a RESTful API with php and curl

Testing a RESTful API can be tricky, but it is totaly feasible. To keep things as easy as possible I use curl to do all the calls. To clean the code as clean as possible, instead of using the PHP implementation of curl, I prefer to directly call the curl command.

May 10, 2015

Authentication of RESTFUL APIs

Authentication in a RESTFUL api is crucial. You don’t want to give unauthorized access to private resources, nor to allow dangerous operations. There are many ways to authenticate a request. For instance:

Apr 19, 2015

RESTFUL API with yii 1.1.x

TL;DR: use the components => urlManager => rules to use HTTP verbs and don’t forget to authenticate the request. Check out on github my sample project that provides a simple RESTFUL API.

Jan 20, 2015

Migrations with Yii

Migrations in yii allow a clean way to change your database schema. Using migrations we can add tables, colummns or change fields type.

Jan 8, 2015

Using phpunit with Yii 1.1.x

Now that Yii 2 was released it may be not very useful, but I’m sure many people are still using 1.1.x versions in production. Because of some internals of Yii it is not possible to install the latest version of PHPUnit, but you have to stick with an old one (I use version 3.7.1). There are basically two ways: PEAR (deprecated) or Composer.

Dec 23, 2014

AWS Elastic Beanstalk and SugarCRM

SugarCRM is an awful piece of software. At least the version I am forced to use — I guess newer versions are better, but we are stuck with an old version which is, well, old.

Nov 18, 2014

How to import lots of rows on MySql

Let’s say you have a lot of data to import. Let’s say you don’t want to do it everyday without any downtime. Here is how I do this.

May 19, 2014

mysqlimport performance

I had to import a very large dataset (about 2.5M rows – OK, not that large, but large enough to cut my teeth on it). After a quick search on google I found out that the most efficient way to import data into mysql is to use the mysqlimport command which is shipped with MySql.

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Today I Learnt

AWS CLI S3 sync command removes the ACL
CircleCI has background tasks
CircleCI has a CLI
diff -y shows the files side by side
Use @Dirtiescontext to invalidate a context in ...
git commit does not add :-/
nevelssl.com provides a TLS free connection, us...
Node's fetch does not behave like fetch
Use ttab to open a tab from the CLI on OsX