avoid commiting .asciidoctor configuration

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Fred 2020-02-05 21:18:29 +01:00
parent aa19b0bab1
commit e98191e12d
2 changed files with 1 additions and 626 deletions

1
.gitignore vendored
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@ -6,3 +6,4 @@ _book/
build
*.log
*.vscode/
*.asciidoctor/

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<meta name="author" content="Cédric Declerfayt, Fred Pauchet">
<title>Deep dive into Django</title>
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</head>
<body class="book">
<div id="header">
<h1>Deep dive into Django</h1>
<div class="details">
<span id="author" class="author">Cédric Declerfayt</span><br>
<span id="email" class="email"><a href="mailto:jaguarondi27@gmail.com">jaguarondi27@gmail.com</a></span><br>
<span id="author2" class="author">Fred Pauchet</span><br>
<span id="email2" class="email"><a href="mailto:fred@grimbox.be">fred@grimbox.be</a></span><br>
</div>
<div id="toc" class="toc">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_configuration_de_lenvironnement">Configuration de l&#8217;environnement</a>
<ul class="sectlevel2">
<li><a href="#_environnements_virtuels">Environnements virtuels</a></li>
<li><a href="#_flake8">Flake8</a></li>
<li><a href="#_black">Black</a></li>
<li><a href="#_pytest">pytest</a></li>
<li><a href="#_mypy">mypy</a></li>
</ul>
</li>
<li><a href="#_déploiement">Déploiement</a>
<ul class="sectlevel2">
<li><a href="#_définition_de_linfrastructure">Définition de l&#8217;infrastructure</a></li>
<li><a href="#_configuration_et_sécurisation_de_la_machine_hôte">Configuration et sécurisation de la machine hôte</a></li>
<li><a href="#_mise_à_jour">Mise à jour</a></li>
<li><a href="#_supervision">Supervision</a></li>
</ul>
</li>
<li><a href="#_déploiement_2">Déploiement</a></li>
<li><a href="#_modélisation">Modélisation</a></li>
<li><a href="#_go_live">Go Live !</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>On ne va pas se mentir: il existe enormément de tutoriaux très bien réalisés sur "Comment réaliser une application Django" et autres "Déployer votre code en 2 minutes". On se disait juste que ces tutoriaux restaient relativement haut-niveau et se limitaient à un contexte donné.</p>
</div>
<div class="paragraph">
<p>L&#8217;idée du texte ci-dessous est de jeter les bases d&#8217;un bon développement, en survolant l&#8217;ensemble des outils permettant de suivre des lignes directrices reconnues, de maintenir une bonne qualité de code au travers des différentes étapes (du développement au déploiement) et de s&#8217;assurer du maintient correct de la base de code, en permettant à n&#8217;importe qui de reprendre le développement.</p>
</div>
<div class="paragraph">
<p>Ces idées ne s&#8217;appliquent pas uniquement à Django et à son cadre de travail, ni même au langage Python. Juste que ces deux bidules sont de bons candidats et que le cadre de travail est bien défini et suffisamment flexible.</p>
</div>
<div class="paragraph">
<p>Pour cela, on présentera différents outils (mypy, flake, black, &#8230;&#8203;), la rédaction de tests unitaires et d&#8217;intégration pour limiter les régressions, les règles de nomenclature et de contrôle du contenu, ainsi que les bonnes étapes pour arriver à un déploiement rapide et fonctionnel en peu d&#8217;étapes.</p>
</div>
<div class="paragraph">
<p>Dans tout à un seul et même endroit. Oui. :-)</p>
</div>
<div class="paragraph">
<p>Bonne lecture.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_configuration_de_lenvironnement">Configuration de l&#8217;environnement</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Et configuration de l&#8217;espace de travail.</p>
</div>
<div class="sect2">
<h3 id="_environnements_virtuels">Environnements virtuels</h3>
<div class="paragraph">
<p>On va commencer avec la partie la moins funky, mais la plus utile, dans la vie d&#8217;un développeur: la gestion et l&#8217;isolation des dépendances.</p>
</div>
<div class="paragraph">
<p>Il est tout à fait possible de s&#8217;en passer complètement dans le cadre de "petits" projets ou d&#8217;applications déployées sur des machines dédiées, et de fonctionner à grand renforts de "sudo" et d&#8217;installation globale des dépendances. Cette pratique est cependant fortement déconseillée pour plusieurs raisons:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Pour la reproductibilité d&#8217;une</p>
</li>
<li>
<p>il est tout à fait envisagable que deux applications soient déployées sur un même hôte, et nécessitent chacune deux versions différentes d&#8217;une même dépendance.</p>
</li>
</ol>
</div>
</div>
<div class="sect2">
<h3 id="_flake8">Flake8</h3>
</div>
<div class="sect2">
<h3 id="_black">Black</h3>
</div>
<div class="sect2">
<h3 id="_pytest">pytest</h3>
</div>
<div class="sect2">
<h3 id="_mypy">mypy</h3>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_déploiement">Déploiement</h2>
<div class="sectionbody">
<div class="paragraph">
<p>On va déjà parler de déploiement. Si vous avez suivi les étapes jusqu&#8217;ici, vous devriez à peine disposer d&#8217;un espace de travail proprement configuré, d&#8217;un modèle relativement basique et d&#8217;une configuration avec une base de données simpliste. En bref, vous avez quelque chose qui fonctionne, mais qui ressemble de très loin à ce que vous souhaitez au final.</p>
</div>
<div class="paragraph">
<p>Il y a une raison très simple à aborder le déploiement dès maintenant: à trop attendre et à peaufiner son développement en local, on en oublie que sa finalité sera de se retrouver exposé sur un serveur. On risque d&#8217;avoir oublié une partie des désidérata, d&#8217;avoir zappé une fonctionnalité essentielle ou simplement de passer énormément de temps à adapter les sources pour qu&#8217;elles fonctionnent sur un environnement en particulier.</p>
</div>
<div class="paragraph">
<p>Aborder le déploiement maintenant permet également de rédiger dès le début les procédures d&#8217;installation, de mise à jour et de sauvegardes. Déploier une nouvelle version sera aussi simple que de récupérer la dernière archive depuis le dépôt, la placer dans le bon répertoire, appliquer des actions spécifiques (et souvent identiques entre deux versions), puis redémarrer les services adéquats.</p>
</div>
<div class="paragraph">
<p>Dans cette partie, on abordera les points suivants:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>La définition de l&#8217;infrastructure nécessaire à notre application</p>
</li>
<li>
<p>La configuration de l&#8217;hôte, qui hébergera l&#8217;application: dans une machine physique, virtuelle ou dans un container. On abordera aussi rapidement les déploiements via Ansible, Chef, Puppet ou Salt.</p>
</li>
<li>
<p>Les différentes méthodes de supervision de l&#8217;application: comment analyser les fichiers de logs et comment intercepter correctement une erreur si elle se présente et comment remonter l&#8217;information.</p>
</li>
<li>
<p>Une partie sur la sécurité et la sécurisation de l&#8217;hôte.</p>
</li>
</ul>
</div>
<div class="sect2">
<h3 id="_définition_de_linfrastructure">Définition de l&#8217;infrastructure</h3>
<div class="paragraph">
<p>Comme on l&#8217;a vu dans la première partie, Django est un framework complet, intégrant tous les mécanismes nécessaires à la bonne évolution d&#8217;une application. On peut ainsi commencer petit, et suivre l&#8217;évolution des besoins en fonction de la charge estimée ou ressentie, ajouter un mécanisme de mise en cache, des logiciels de suivi, &#8230;&#8203;</p>
</div>
</div>
<div class="sect2">
<h3 id="_configuration_et_sécurisation_de_la_machine_hôte">Configuration et sécurisation de la machine hôte</h3>
<div class="paragraph">
<p>Supervisor, nginx, gunicorn, utilisateurs, groupes, &#8230;&#8203;</p>
</div>
<div class="paragraph">
<p>Aussi : Docker, Heroku, Digital Ocean, Scaleway, OVH, &#8230;&#8203; Bref, sur Debian et CentOS pour avoir un panel assez large. On oublie Windows.</p>
</div>
</div>
<div class="sect2">
<h3 id="_mise_à_jour">Mise à jour</h3>
<div class="paragraph">
<p>Script de mise à jour.</p>
</div>
</div>
<div class="sect2">
<h3 id="_supervision">Supervision</h3>
<div class="paragraph">
<p>Qu&#8217;est-ce qu&#8217;on fait des logs après ? :-)</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_déploiement_2">Déploiement</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Et sécurisation du serveur.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_modélisation">Modélisation</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Et administration.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_go_live">Go Live !</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Et supervision.</p>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2020-02-04 21:19:08 +0100
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