[Koha-devel] Marseille16 / REST api

[David Cook]

Really curious to see how this plays out!

 

I’ve just added parameter validation to a Koha::Object, and while it works well enough, I’m hoping for a more generalized solution. I haven’t looked at Koha::Exceptions::* yet, but maybe that will help.

 

Peeking at Koha::Exceptions::MissingParameter, I hope that there’s more specificity than just “A required parameter is missing”. I’d want to know which required parameter is missing. 

 

Is there a document somewhere saying how to use Koha::Exceptions?

 

David Cook

Systems Librarian

Prosentient Systems

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Australia

 

Office: 02 9212 0899

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From: koha-devel-bounces at lists.koha-community.org [mailto:koha-devel-bounces at lists.koha-community.org] On Behalf Of Tomas Cohen Arazi
Sent: Wednesday, 12 October 2016 2:39 AM
To: koha-devel <koha-devel at lists.koha-community.org>
Subject: [Koha-devel] Marseille16 / REST api

 

During the first couple Hackfest days, Jonathan, Benjamin and I worked on a reference implementation of CRUD code for a REST endpoint, so others can read it, discuss it and use it as a reference for their own developments.

 

We worked on Koha::Cit(y|ies) because it was a really simple class. All our work is now on bug 17428.

 

The main goals/concepts we tried to apply were:

* Controller class (Koha::REST::V1::Cities) should be as simple as possible. No business logic on it. All business logic is expected to be put on the Koha::Cit(ies|y) classes. And fully tested.

* All verbs/use cases should be covered by tests (t/db_dependent/api/v1/cities.t). We did it, and this file could be used (with little adjustments) as the basis for new endpoint tests.

* Heavy use of exceptions. I wouldn't say we heavily use them, but the point is that we pass everything to the business object, and catch exceptions it might raise. Martin pointed out that he would help us further simplify it, making heavier use of the Swagger plugin's facilities. Specially on parameters sanity check. More on this tomorrow!

* Koha::Exceptions got per-class files so the exceptions file is more manageable. Bug 17425 introduced Koha/Exceptions/Object.pm, and we propose that's the way to go (Koha/Exceptions.pm still has Virtualshelves-related exceptions that should be moved).

* Make use of Try::Tiny for try/catch blocks. On the process we wrote bug 17425, which introduces new exceptions, we added the dependency for Try::Tiny (no worries, it is packaged for Jessie/Ubuntu) and Mirko was here to validate.

* Moving business-logic to Koha:: namespace and write REST endpoints on top of that business objects. We picked a simple object, Koha::Patron(s) will be a more complex one of course. This is what Jonathan has been doing, and people willing to write REST endpoints should check with him, and probably help moving business logic into Koha:: namespace.

 

There are several patches on bugzilla introducing endpoints. We will try to contact patch authors to help them make their work match this proposed 'guidelines'.

 

We are sticking to the 'patches speak' approach, so feel free to criticize this implementation, to improve it or even provide a counter-proposal. We are otherwise moving on, trying to get a functional complete REST api ASAP.

 

Thanks!

 

Tomas, Jonathan, Benjamin

 

 

 

-- 

Tomás Cohen Arazi

Theke Solutions (https://theke.io <http://theke.io/> )
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