Mojolicious and REST

Nov 24, 20134 likes3,755 views

This document discusses building RESTful interfaces using the Mojolicious framework in Perl. It notes that implementing REST with Mojolicious is easy, but can lead to an anti-pattern of encoding media types in URLs instead of using accept headers. The recommended practice is to use accept headers to specify media types rather than encoding them in the URL. The document provides an example of using Mojolicious to respond with different media types depending on the accept header.

Mojolicious and REST
Building a RESTful interface using Mojolicious

By @jonasbn for Nordic Perl Workshop 2013

-

$authbridge->route(‘/domain/is_available/:domainname')

+

$authbridge->route(‘/domain/is_available/#domainname')

•

Implementing REST using Mojolicious is easy

•

very easy

•

too easy

Rest in
Practice
Ian Robinson, Jim Webber
and Savas Parastatides
•

On mediatypes, describes an antipattern implemented in Ruby on Rails

•

•
•

On mediatypes, describes an
anti-pattern implemented in
Ruby on Rails (RoR)
This pattern has unfortunately
made it to Mojolicious
and that is to have the mediatype communicated on the URL

•

The recommended practice is to use Accept
headers to communicate media-types

•

and these can be weighted 8-o

•

We use HTTP status codes to communicate state
and status

•

URLs should be used to communicate intent not
formatting

•

For Mojolicious this required some experimenting

$$self->respond_to( json => { status => $status, json => $response }, text => { status => $status, text => $message }, xml => { status => $status, text => XMLout( $response, NoAttr => TRUE, RootName => XML_ROOT, keyattr => [], XMLDecl => XML_DECL ) }, any => { status => HTTP_UNSUPPORTED_MEDIA_TYPE, json => status_message(HTTP_UNSUPPORTED_MEDIA_TYPE) }, );$

Lessons Learned
•

Mojolicious does the right thing when it comes to the
Accept header and actually does it quite well

•

The anti-pattern supported by Mojolicious can be
avoided

•

Use # instead of : in your routes (see the diff) and it will
work

•

But actually ?format=(json|text|xml) is supported but we
only use it for debugging (and it actually has
precedence (and it is undocumented on our side))

- Mojolicious is a web development framework for Perl that aims to rethink web development - It provides a powerful routing system, full HTTP implementation, simple templating, built-in JSON support, elegant plugin system, and class reloader - Installation is simple using CPAN and has no dependencies beyond Perl 5.8.1 - It includes classes for requests, responses, templates, JSON encoding/decoding, and more - Plugins can hook into various stages of the request lifecycle - Supports generating applications, running commands, and provides a simple but powerful way to build web applications and services in Perl

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Stackato is a Platform as a Service (PaaS) cloud computing product from ActiveState that allows developers to easily deploy applications and services written in languages like Perl, Ruby, and JavaScript to public and private clouds. The presenter evaluates Stackato based on their experience, demonstrating how to deploy a simple "Hello World" Perl application using Mojolicious and exploring Stackato's management console, application updating process, and built-in app store. They conclude that Stackato provides benefits like easy access to platforms and frameworks with minimal differences between development and production.

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Mojolicious and REST

1. Mojolicious and REST Building a RESTful interface using Mojolicious By @jonasbn for Nordic Perl Workshop 2013

2. - $authbridge->route(‘/domain/is_available/:domainname') + $authbridge->route(‘/domain/is_available/#domainname')

3. • Implementing REST using Mojolicious is easy • very easy • too easy

4. but!

5. Rest in Practice Ian Robinson, Jim Webber and Savas Parastatides • On mediatypes, describes an antipattern implemented in Ruby on Rails

6. • • • On mediatypes, describes an anti-pattern implemented in Ruby on Rails (RoR) This pattern has unfortunately made it to Mojolicious and that is to have the mediatype communicated on the URL

7. so?

8. • The recommended practice is to use Accept headers to communicate media-types • and these can be weighted 8-o • We use HTTP status codes to communicate state and status • URLs should be used to communicate intent not formatting • For Mojolicious this required some experimenting

9. code?

10. $self->respond_to( json => { status => $status, json => $response }, text => { status => $status, text => $message }, xml => { status => $status, text => XMLout( $response, NoAttr => TRUE, RootName => XML_ROOT, keyattr => [], XMLDecl => XML_DECL ) }, any => { status => HTTP_UNSUPPORTED_MEDIA_TYPE, json => status_message(HTTP_UNSUPPORTED_MEDIA_TYPE) }, );

11. Lessons Learned • Mojolicious does the right thing when it comes to the Accept header and actually does it quite well • The anti-pattern supported by Mojolicious can be avoided • Use # instead of : in your routes (see the diff) and it will work • But actually ?format=(json|text|xml) is supported but we only use it for debugging (and it actually has precedence (and it is undocumented on our side))

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