MaxMind is sponsoring the Perl Toolchain Summit

The Perl Toolchain Summit (PTS) is happening this week in Marlow, on the banks of the River Thames, in the UK. Most of the attendees will gather on Wednesday evening, with the real business kicking off at 9am on Thursday morning. For the next four days 32 Perl developers will be working intensively on the tools that all Perl developers rely on.

Attendees log their activities on the wiki, and blog posts will appear during and after. You can see some of what goes on in semi real-time on twitter, via the #pts2019 hashtag.

We're extremely grateful to MaxMind, who once again are a Gold Sponsor for the PTS. The attendees are brought together from around the world, and we're only able to do this with the support of companies from our community, like MaxMind.

Perl Weekly Challenge: Week 4

These are some answers to the Week 4 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

This post will be relatively short, because I don't have too much time this week.

Challenge #1: Pi Digits

Write a script to output the same number of PI digits as the size of your script. Say, if your script size is 10, it should print 3.141592653.

A Perl 5 Solution

Here, I decided to make it really short. This a Perl 5 one-liner:

perl -E '
say 4*atan2 1,1


I am planning on a new project, and a friend suggested me to look to Arango, as an alternative do Mongo, specially because it includes a graphs query language integrated. As I am not really used to Mongo at all, decided to give it a try.

Unfortunately I did not find a proper module to use Arango from Perl. Therefore I decided to start one from scratch. Probably not a great idea as my free time is likely non-existent. But nevertheless, I did it.

I am trying to abstract major entities (database, collection, document, cursor) in order to use them directly as proper objects in Perl, and at the same time, try to keep a low code profile, delegating most options directly to Arango REST interface. In order not to be too relaxed, I am using JSON::Schema::Fit to validate the parameters sent to Arango API.

SPVM 1.0 language specification

Language specification of SPVM 1.0 is described in this document. SPVM is in beta testing for the 1.0 release. Language specifications are subject to change without notice.

SPVM 1.0 Language Specification

Perl Toolchain Summit: People & Projects

The Perl Toolchain Summit (PTS) is taking place later this month in Marlow, in the UK, as previously announced. This event brings together maintainers of most of the key systems and tools in the CPAN ecosystem, giving them a dedicated 4 days to work together. In this post we describe how the attendees are selected, and how we decide what everyone will work on. We're also giving you a chance to let us know if there are things you'd like to see worked on.

This blog post is brought to you by cPanel, who we're happy to announce are a Platinum sponsor for the PTS. cPanel are a well-known user and supporter of Perl, and we're very grateful for their support. More about cPanel at the end of this article.

Perl Weekly Challenge: Week 3

These are some answers to the Week 3 of the Perl Weekly Challenge organized by Mohammad S. Anwar.

Challenge #1: 5-Smooth Numbers

Create a script to generate 5-smooth numbers, whose prime divisors are less or equal to 5. They are also called Hamming/Regular/Ugly numbers. For more information, please check this wikipedia page.

Regular or 5-smooth numbers (or Hamming numbers) are numbers whose prime divisors are only 2, 3, and 5, so that they evenly divide some powers of 30.

A Perl 5 Solution

Generating just some 5-smooth numbers is a trivial problem. For example, if you want 6 such numbers, you only need to generate the first six powers of 2 (or the first six powers of 3, or six powers of 5), as in this Perl one-liner:

Dibs - Envars Envisaged As Enviles

The saga goes on! This time we talk about enviles, a way to pass key/value pairs without polluting the environment while still keeping it dumb simple. Find the article here: Dibs - Envars Envisaged As Enviles and, as always, enjoy!

Memoising - standardisation of normalisation

Hopefully, the sesquipedalian polysyllabalisation of the title will have made your eyes glaze over. Now to wake you up: MASSIVE PERFORMANCE GAINZ!

Memoising, as any fule kno, is storing answers after they're calculated, against each set of inputs, so you don't have to keep re-calculating the same thing. If the calculating process is expensive, or even just more expensive than normalising (see below) and a lookup, this can make your programs run faster. Possibly much faster!

This is a thing that works great for computing factorials or Fibonacci numbers. It's a terrible idea for calculating the lengths of simple lists, since normalising would take longer than simply recalculating, and worse would be very unlikely to give repeated hits.

Daily CPAN upload: 600 days

Today is a very special day for me, why? I have now completed 600th day daily upload to CPAN. So what is the big deal? Honestly speaking it is not. Having said that I enjoyed playing this CPAN Game and would like to continue as long as possible. Where did it all started? Well it was one of the blog by Neil Bowers that inspired me and introduced to the fun game. At that I point, I only had handful of modules to work with. I knew I needed lots of distributions to get me going. Nearly a year later, Barbie blog about his completion of one year of daily CPAN upload.

CPAN Regular Releasers - Current Chains

LemonLDAP::NG 2.0.3 released!

Another perl software that I use / like was just released. I will embed the tweet because it has clapping sheep.

LemonLDAP::NG is the Web SSO software youve been looking for - even if you dont use LDAP

Checkout the full release details

GSL of C language binding to Perl - native keyword of Raku language is exported to Perl/SPVM

GSL of C language binding to Perl - native keyword of Raku is exported to Perl/SPVM

I success GSL binding by Perl/SPVM!

GSL of C language binding to Perl/SPVM

I export native keyword to Perl/SPVM. This is greate features of Raku language.

use strict;
use warnings;

use FindBin;
use lib "$FindBin::Bin/lib";

use SPVM 'MyGSL';

package MyGSL {
  native sub stat : void ();

Dibs - Remote Packs

A new article about Dibs (Docker image build system): Dibs - Remote Packs - hope you will enjoy!

Call for volunteers to update OWASP Perl Wiki

Hello Perl Hackers!!

OWASP (Open Web Application Security Project ) is a project that is focused on the visibility of software security and it needs our help updating its wiki entry on Perl related technologies.

Why am I posting this? Well a few months ago OWASP had listed Perl in its list of programming languages but presently Perl has been removed from the listing and I assume this is due to the fact that the Perl section has not been updated.

So if you are still reading this and you are a contributor to any of the Perl 5 and 6 ( cuz why not ) Web frameworks that are in use and available today please consider taking some time to update the OWASP Perl wiki.

The wiki needs updated information about the Web Frameworks that exist for Perl 5 and the available plugins used for Authentication, Authorization and Password policies. The current list of web frameworks listed on the OWASP Perl wiki are ( Catalyst, CGI, Dancer, Jifty and Mojolicious )

Please Note: Wiki Account requests to the OWASP wiki system are subject to approval by the OWASP organization ( so I can't guarantee an immediate response to an account request.)

What's new in Proxmox VE 5.4

Proxmox VE is a virtualization and LXC platform - all written in Perl.

I wrote most of the the Perl client API on the CPAN - and use it with quite a few $clients.

Proxmox VE 5.4 introduces new features:

- Debian Stretch 9.8 and Linux Kernel 4.15.
- New installation wizard for Ceph in the UI,
- New HA policies freeze/fail-over/default for greater flexibility,
- Suspend to disk/Hibernation support for Qemu guests,
- Support for Universal 2nd Factor (U2F) authentication,
- Improved ISO installation wizard,
- New options for Qemu guest creation wizard

View the detailed release notes:

Atomic Updates with DBIx::Class

As we're building Tau Station, a narrative sci-fi MMORPG written in Perl, we've encountered any of a number of challenges, not the least of which is that this is a very "write-heavy" application. Further, because it's a universe where people interact, there's often no clear isolation between what you can change and what I can change. Thus, there's a lot of writing to the database and often to the same data!

By now you've probably heard of the Object-Relational Impedance Mismatch, which is just a fancy way of saying "collections of objects and databases aren't the same thing."

One problem which is particularly difficult is handling "syndicate credits". Syndicates ("guilds" in other MMORPGs) can tax their members and every time a member gets credits deposited in their bank account, a certain percentage goes to the syndicate. So let's say two syndicate members each earn 100 credits at the same time, paying 10% tax to their syndicates. It can look like this:

Rakudo.js update - running tests in a real Chrome

What now works

We now can parcel up and pass tests from our chosen subset under a real Chrome (for testing purposes a Headless Chrome controlled by puppeteer ).

Our test runner is in

It runs tests using a precompiled working version of rakudo.js fetch from npm using a roast revision we know passes.

What's missing or fudged?

Tests that are broken under precompilation on all backends

In the browser we precompile tests before running which means the tests are run differently then
how they are tested on other backends.
As a result a whole bunch of tests fail under precompilation even on the Moar backend.
They need to be fixed as they are real bugs in Rakudo on all backends (as most proper codes
tends to live in precompiled modules not scripts) but that's work separate from the js backend.

Tests that don't make sense in the browser itself.

Swiss Perl Workshop 2019 - Call For Papers

This year's Swiss Perl Workshop is just a few months away, and we're looking forward to another interesting and fun event in Olten. The workshop takes place just a week after this year's The Perl Conference in Riga so perhaps if you're attending one you could spend a little more time in central Europe and attend the other, and if you're planning to give a talk at The Perl Conference then...

Either way, we encourage you to submit talks and we welcome a broad range of subjects, your talk does not have to be specifically Perl related. Share your experience with others, be it your daily messing around with bugs, writing interesting modules, hardware hacking, Perl 5, Perl 6, devops, and so on.

One thing to note for any attendees is that the wonderful kitchen crew from previous years will be helping us again in Olten, and we would like to give them a list of dietary requirements as far as possible in advance. If you need to let us know of this then please tell us by adding information to the SPW Wiki here.

We look forward to seeing you in Olten this August.

Great thanks go to our sponsors, who have already committed to the event:

Monthly Report - March

"Sherlock Holmes & the Case of the Missing Parsing Solution"

There is a new blog post at my Ocean of Awareness blog: "Sherlock Holmes and the Case of the Missing Parsing Solution" .

Austin Perl Mongers Hackathon Planning - Part 1

Exciting news from Austin, TX!

The Austin Perl Mongers are launching our very first full Hackathon. It is scheduled for late April, on two weekends, Saturday 20th and 27th. Our goal is to create a Perl class for teenagers. We will achieve this at the Hackathon by upgrading the CloudForFree platform, adding graphics, and a live development feature. The students will be able to see the result of their coding, as they write their code! It can make the learning of programming more accessible to teenagers, and it introduces them to Perl.

The project managers for this Hackathon are yours truly and Bonnie Cope, a programmer and Perl enthusiast. Will 'the Chill' Braswell, creator of the platform, is one of the programming team leads.

You can check out the CloudForFree platform on


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