YAPC::Europe Day 2

Just while I was having a shower, the hotel had a 5-minute power cut. I decided to walk down the stairs to breakfast.

Another day of two breakfasts, one at the hotel and one at the conference venue (even more Баница) while meeting everyone.

Today I've mostly stayed in the "Devops" track as I've been doing a lot of web operations recently.

First talk of the day: SyContent - Content in the Cloud with V8. Torsten took us through the history of content management systems. He explained how he thinks content management should work, with Perl, PHP, static JSON files and V8.

Then Docker with Perl - an Introduction where Denis explained what Docker is and how he suggests we use them with Perl, although he doesn't run Docker in production yet. He explained that it really comes out of a DevOps culture. I currently use Docker to package the applications on my personal servers, so perhaps I'm a little too experienced for this talk. I particularly like the Docker workflow.

Type::Tiny Tricks #7: Tricks with Dicts

In Perl, hashes are typically used for two sorts of purposes: maps (where the hash key acts as an object identifier) and dictionaries (where the hash key acts like a field name). A quick illustration of what I mean by this:

   # Maps
   my %ages = (
      alice   => 24,
      bob     => 25,
      carol   => 31,
   my %email = (
      alice   => "alice@example.net",
      bob     => "robert.smith@example.com",
      carol   => "c_jones@example.org",
   # Dictionaries
   my %alice = ( age => 24, email => "alice@example.net" );
   my %bob   = ( age => 25, email => "robert.smith@example.com" );
   my %carol = ( age => 32, email => "c_jones@example.org" );

These are two different styles of using hashes. Sometimes one is useful, and sometimes the other is. Sometimes neither is better and your choice of one over the other is fairly arbitrary.

Types::Standard contains a type constraint called Map which is useful for validating references to the first kind of hash. (I copied the idea from MooseX::Types::Structured.) But today I'm mainly going to talk about another type constraint: Dict. (Yeah, I copied that one too.)

YAPC::Europe 2014, day 2

(cross-posted from blog.tobez.org)

Ignat Ignatov talked about physical formulas. When I was planning to attend this talk, I thought it is going to be some sort of symbolic formulas computation, possibly with an analysis of dimensions of the physical quantities. However, despite my (a bit long in the tooth) background in physics, I did not understand a word of it. Apparently, some sort of unification of physical formulas, not entirely unlike the periodic table in chemistry, was presented, with almost no comprehensible details and with scary words like co-homology and algebraic topology. The fact that half of the slides were in Russian, while irrelevant for me personally, probably did not help matters for the majority of the people in the audience. I did not expect any questions at the end of the talk, but there were at least two, so I was probably wrong about general level of understanding in the audience.

YAPC::Europe 2014, day 1

(crossposted from blog.tobez.org)

When I came to the venue 15 minutes before the official start of the registration, people at the registration desk were busily cutting sheets of paper into attendees' badges. Finding my badge turned out to be a tad not trivial.

This conference is somewhat unusual not only because it is conducted over the weekend instead of in the middle of the week, but also because the keynotes for every day are pushed till the end, even after the daily lightning talks session.

The welcome talk from Marian was about practical things such as rooms locations, dinner, lunches, transportations and so on. Then I went on stage to declare the location of YAPC::Europe 2015 (which is Granada, Spain by the way). After that Jose Luis Martinez from Barcelona.pm did a short presentation of YAPC in Granada, and Diego Kuperman gave a little present from Granada to Sofia.

YAPC::Europe Day 1

A day of two breakfasts, one at the hotel and one at the conference venue (more Баница) while meeting everyone.

First big announcement of the day was that YAPC::Europe 2015 will be in Granada, Spain.

And then the first talks of the conference. I chose to attend Welcome to Auditing and toughening as part of the Security Development Lifecycle which was an interesting look at how hardening a system is just a small part of the security development lifecycle. John highlighted the importance of a threat model and how avoiding vulnerabilities as early as possible is the only way to go. He went though a few practical examples of where was the best place to fix

Over sandwiches at lunch we had a little discussion about the compromises between fixing vulnerabilities and maintaining backwards compatibility.

The Wi-Fi has been a little spotty, but mosh make it usable.

Next up was Code I'm proud of: where Thomas explained lots of little hacks, from passwords and Bread::Board to microblogging.

Type::Tiny Tricks #6: Tricks with Tuples

Let's say you want an attribute to accept a pair of numbers - perhaps a geographic co-ordinates [ 50.873, -0.002 ]. You could constrain the attribute as ArrayRef[Num], but that would accept an arrayref containing a single number, or eight numbers, or even a reference to an empty array.

With the Tuple type constraint, you can be more exact in expressing which values are acceptable:

   isa  => Tuple[ Num, Num ]

YAPC::Europe Day 0

I travelled from Heathrow to Sofia, Bulgaria very early this morning. I managed to bump into a few Perl Mongers on the flight over and we were welcomed by a camel sign at the airport. I managed to find my hotel and have a proper shower. First order of business was to have a proper lunch, I bumped into someone and we took the shiny new metro system into town and explored the center of town. I managed to pick up a Баница , a pastry with fresh cheese. We then wandered around, found a great Rodin exhibition and made it to the evening meetup a little early. Luckily we weren't the only people turning up early and started drinking a Zagorka or two. Very drinkable.

Type::Tiny Tricks #5: Wrapping Moose/Mouse Type Constraints

So you have this Moo class, and it turns out what you really need for it is the StrictVersionStr type constraint defined in MooseX::Types::Perl. You could switch the class to Moose, but long term you want to stick with Moo.

Eventually you'll steal what you need from MooseX::Types::Perl, so you don't have the Moose dependency, but for now what you really want is to be able to use a Moose type constraint within a Moo class! What a predicament you've gotten yourself into! Type::Tiny to the rescue!

      package Local::Eg5;
      use Moo;
      use MooseX::Types::Perl qw( StrictVersionStr );
      use Types::TypeTiny qw( to_TypeTiny );
      has version_number => (
         is   => "ro",
         isa  => to_TypeTiny( StrictVersionStr ),

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