{"id":705,"date":"2010-07-31T15:57:25","date_gmt":"2010-07-31T13:57:25","guid":{"rendered":"http:\/\/j-mad.com\/blog\/?p=705"},"modified":"2010-07-31T15:57:25","modified_gmt":"2010-07-31T13:57:25","slug":"django-websocket-parce-que-sans-chaussettes-le-web-il-pue-un-peu-des-pieds","status":"publish","type":"post","link":"https:\/\/j-mad.com\/blog\/2010\/07\/31\/django-websocket-parce-que-sans-chaussettes-le-web-il-pue-un-peu-des-pieds\/","title":{"rendered":"Django-websocket parce que sans chaussettes, le web, il pue un peu des pieds"},"content":{"rendered":"<p>Et oui, malgr\u00e9 la chaleur, malgr\u00e9 les vacances, la plage et l&#8217;appel de starcraft 2, malgr\u00e9 tout cela, je reste fid\u00e8le au poste et je publie une django app du mois. Bon ok, c&#8217;est le dernier jour du mois, mais je suis encore dans les clous.<\/p>\n<p>Mais par contre, vu que c&#8217;est l&#8217;\u00e9t\u00e9, les vacances, je vais pour une fois parler d&#8217;une app qui est pour faire tout sauf de la prod. C&#8217;est une app toute jeune et qui en plus s&#8217;aventure dans un domaine encore tr\u00e8s peu support\u00e9s dans les navigateurs (pour l&#8217;instant uniquement dans Chrome 4, Firefox 4 et Safari 5) , celui des websockets. C&#8217;est quoi une websocket vous allez me dire\u00a0? C&#8217;est un m\u00e9canisme qui appara\u00eet dans HTML 5 et qui permet d&#8217;avoir un m\u00e9canisme de connexion persistante et bi directionnelle entre le serveur web et le browser de l&#8217;utilisateur. Trop cool vous allez me dire. Je ne puis qu&#8217;\u00eatre d&#8217;accord avec vous. (pour plus d&#8217;infos sur les websockets vous pouvez aller lire la <a href=\"http:\/\/en.wikipedia.org\/wiki\/WebSockets\">page wikipedia<\/a> ou la <a href=\"http:\/\/dev.w3.org\/html5\/websockets\/\">norme W3C<\/a> qui est plut\u00f4t facile \u00e0 lire).<\/p>\n<p>Django-websocket est donc une toute r\u00e9cente app (version 0,3 \u00e0 l&#8217;heure ou j&#8217;\u00e9cris ce billet) qui permet de commencer \u00e0 s&#8217;amuser avec ces adorables websockets.<\/p>\n<h1>1- O\u00f9 on le trouve, comment on l&#8217;installe, la doc.<\/h1>\n<p>Vous trouverez django-websocket sur sa <a href=\"http:\/\/pypi.python.org\/pypi\/django-websocket\">page pypi<\/a> ou sur sa <a href=\"http:\/\/github.com\/gregor-muellegger\/django-websocket\/\">page github<\/a>. L&#8217;installation se fera donc soit\u00a0:<\/p>\n<ul>\n<li>avec easy_install<\/li>\n<li>un git clone<\/li>\n<\/ul>\n<p>Comme le code \u00e9volue pas mal et que de toute fa\u00e7on c&#8217;est pour l&#8217;instant plus une app pour tester et pas pour mettre en prod, moi, je vous conseillerais le git clone qui vous permettra d&#8217;avoir plus souvent une app \u00e0 jour.<\/p>\n<p>La documentation est plut\u00f4t bien fournie, claire et suffit pour d\u00e9marrer. Le repository github permet d&#8217;avoir en plus les tests et une petite application example de echo.<\/p>\n<h1>2- Comment \u00e7a marche\u00a0?<\/h1>\n<p>En fait c&#8217;est vraiment super facile, il suffit d&#8217;utiliser deux d\u00e9corateurs de vues soit\u00a0:<\/p>\n<ul>\n<li>require_websocket pour obliger la vue \u00e0 fonctionner en websocket<\/li>\n<li>accept_websocket si l&#8217;on veut permettre \u00e0 la vue de fonctionner sans les websockets.<\/li>\n<\/ul>\n<p>Ensuite il n&#8217;y a qu&#8217;un seul objet \u00e0 utiliser request.websocket sur lequelle on pourra\u00a0:<\/p>\n<ul>\n<li>faire des attentes et r\u00e9cup\u00e9rer un message quand il y en a un (wait)<\/li>\n<li>v\u00e9rifier si il y a des messages ( has_messages )<\/li>\n<li>lire un message ( read )<\/li>\n<li>envoyer un message ( send )<\/li>\n<li>les utiliser comme un iterator (ce qui ferrait comme un wait dans une boucle avec la gestion en plus de la fermeture de la socket )<\/li>\n<\/ul>\n<p>Petite pr\u00e9cision, le serveur de d\u00e9veloppement de django n&#8217;est pas multithread, il n&#8217;est donc pas possible d&#8217;ouvrir deux requ\u00eates concurrentes avec. L&#8217;app fourni donc une commande sp\u00e9ciale pour le runserver ( &#8211;multithreaded ) qui permet de contourner le probl\u00e8me.<\/p>\n<h1>3- Un petit Mad Exemple<\/h1>\n<p>Histoire de m&#8217;amuser un peu avec l&#8217;app, j&#8217;ai commis un petit exemple avec, en me basant sur le echo exemple. Mon exemple est tout con, vous entrez une chaine de caract\u00e8re et je lance (gr\u00e2ce \u00e0 <a href=\"http:\/\/benoitc.github.com\/restkit\">restkit<\/a>) une recherche google toute les 30 secondes sur la chaine de caract\u00e8re. Les dix premiers r\u00e9sultats de la recherche sont ensuite affich\u00e9s gr\u00e2ce \u00e0 la websocket.<\/p>\n<p>Vous pourrez trouver le code en question sur le tout <a href=\"http:\/\/bitbucket.org\/jmad\/tests_django\">nouveau repository bitbucket<\/a> que j&#8217;ai du coup, cr\u00e9e pour l&#8217;occasion.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Et oui, malgr\u00e9 la chaleur, malgr\u00e9 les vacances, la plage et l&#8217;appel de starcraft 2, malgr\u00e9 tout cela, je reste fid\u00e8le au poste et je publie une django app du mois. Bon ok, c&#8217;est le dernier jour du mois, mais je suis encore dans les clous. Mais par contre, vu que c&#8217;est l&#8217;\u00e9t\u00e9, les vacances, &hellip; <a href=\"https:\/\/j-mad.com\/blog\/2010\/07\/31\/django-websocket-parce-que-sans-chaussettes-le-web-il-pue-un-peu-des-pieds\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Django-websocket parce que sans chaussettes, le web, il pue un peu des pieds<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[35],"tags":[99,98,75],"class_list":["post-705","post","type-post","status-publish","format-standard","hentry","category-la-django-app-du-mois","tag-django","tag-python","tag-websocket"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.8 - 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