doc/book/fr/03-02-create-instance.fr.txt
author sylvain.thenault@logilab.fr
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.. -*- coding: utf-8 -*-
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===================================
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Creation de votre premiere instance
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===================================
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Qu'est-ce qu'une instance?
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==========================
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Une instance CubicWeb consiste en un dossier situe dans ``~/etc/cubicweb.d``
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qui permettra de lancer une application web. Une instance est cree a partir
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d'un ou plusieurs cubes.
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Nous recommandons de ne pas definir de schema, entites ou vues dans l'instance 
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meme si cela est possible dans un but de re-utilisabilite des entities et de leurs
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vues. Nous conseillons plutot de developper des cubes qui pourront par la suite
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etre utilises dans d'autres instances (approche modulaire).
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L'instance n'est qu'un conteneur referrant a des cubes et a des parametres
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des configuration de l'application web.
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Qu'est-ce qu'un cube?
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=====================
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Un cube definit des entities, leur vues, leur schemas et leur workflow 
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dans un repertoire independant situe dans ``/path/to/forest/cubicweb/cubes/``.
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Lors de la creation d'une instance, vous avez la possibilite de lister
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le ou les cubes que votre instance va utiliser. Utiliser un cube signifie
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avoir a disposition dans votre instance les entites definies dans le schema
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de votre cube ainsi que les vues et les workflows.
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.. note::
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   Les commandes utilisees ci-apres sont detaillees dans la section
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   dediee a :ref:`cubicweb-ctl`.
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Création d'un cube
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==================
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Commençons par créer un squelette qui nous servira de base au développement de
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notre cube ou application ::
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  cd ~/hg
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  cubicweb-ctl newtemplate moncube
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  # répondre aux questions
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  cd moncube
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  hg init 
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  hg add .
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  hg ci
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A partir de là si tout va bien, votre cube devrait être affiché par
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`cubicweb-ctl list` dans la section *Available components*, si ce n'est pas le cas
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revoir la section :ref:`ConfigurationEnv`.
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Pour utiliser un cube, il faut le mentionner dans la variable
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__use__ du fichier __pkginfo__ de l'application. Cette variable
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contrôle à la fois le packaging de l'application (dépendances gérées
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par les utilitaires système comme les outils APT) et les composants
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effectivement utilisables lors de la création de la base
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(import_erschema('Moncomposant') ne fonctionne pas sinon).
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FIXME - need example code ::
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  __use__ = ('blog', 'file')
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Création d'une instance de développement
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========================================
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Maintenant que nous avons notre squelette de modèle, on peut en créer une
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instance afin de voir ce que tout ça donne dans un simple navigateur web.
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Nous allons utiliser une configuration `all-in-one` afin de simplifier les
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choses ::
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  cubicweb-ctl create -c all-in-one moncube moninstance
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Une série de questions vont être posées, la réponse par défaut est généralement
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suffisante. Vous pourrez de toute façon modifier la configuration par la suite
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en éditant les fichiers générés. Lorsqu'un login/mot de passe d'accès au sgbd
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vous est demandé, il est recommandé d'utiliser l'utilisateur créé lors de la
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:ref:`ConfigurationPostgres`.
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Il est important de distinguer ici l'utilisateur utilisé pour accéder au sgbd,
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et l'utilisateur utilisé pour s'authentifier dans l'application cubicweb. Lorsque
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l'application cubicweb démarre, elle utilise le login/mot de passe sgdb pour
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récupérer le schéma et gérer les transactions bas-niveau. En revanche, lorsque
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`cubicweb-ctl create` vous demande un login/mot de passe `manager` pour cubicweb, il
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s'agit d'un utilisateur qui sera créé dans l'application `cubicweb` pour pouvoir
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s'y connecter dans un premier temps et l'administrer. Il sera par la suite possible
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de créer des utilisateurs différents pour l'application.
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A l'issue de cette commande, la définition de votre instance se trouve dans
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*~/etc/cubicweb.d/moninstance/*. Pour la lancer, il suffit de taper ::
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  cubicweb-ctl start -D moninstance
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L'option `-D` indique le *debug mode* : l'instance ne passe pas en mode serveur
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et ne se déconnecte pas du terminal, ce qui simplifie le dépannage en cas de non
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démarrage de l'instance. Vous pouvez ensuite allez voir ce que ça donne en
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pointant votre navigateur sur l'url `http://localhost:8080` (le n° de port
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dépend de votre configuration). Pour vous authentifier vous pouvez utiliser le
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login/mot de passe administrateur que vous avez spécifié lors de la création de
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l'instance.
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Pour arrêter l'instance, un Ctrl-C dans la fenêtre où vous l'avez lancé
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suffit. Si l'option `-D` a été omise, il faut taper ::
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  cubicweb-ctl stop moninstance
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Voilà, tout est en place pour démarrer le développement du modèle...
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Utilisation de cubicweb-liveserver
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----------------------------------
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Afin de tester rapidement un nouveau cube, on peut également
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utiliser le script `cubicweb-liveserver` qui permet de créer une
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application en mémoire (utilisant une base de données SQLite par
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défaut) et la rendre accessible via un serveur web::
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  cubicweb-ctl live-server moncomposant
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ou bien, pour utiliser une base de données existante (SQLite ou postgres)::
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Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents:
diff changeset
   130
  cubicweb-ctl live-server -s monfichier_sources moncomposant
0857f1fd76cf Add link to installation in front page.
Sandrine Ribeau <sandrine.ribeau@logilab.fr>
parents:
diff changeset
   131