{"id":863,"date":"2011-03-19T10:07:11","date_gmt":"2011-03-19T10:07:11","guid":{"rendered":"http:\/\/blog.milamberspace.net\/?p=863"},"modified":"2011-03-19T10:10:39","modified_gmt":"2011-03-19T10:10:39","slug":"jmeter-et-groovy-avoir-des-requetes-http-concurrentes","status":"publish","type":"post","link":"https:\/\/blog.milamberspace.net\/index.php\/2011\/03\/19\/jmeter-et-groovy-avoir-des-requetes-http-concurrentes-863.html","title":{"rendered":"JMeter et Groovy\u00a0: avoir des requ\u00eates HTTP concurrentes"},"content":{"rendered":"

Maintenant que nous avons vu comment faire des scripts Groovy dans JMeter<\/a>, utilisons Groovy pour faire des requ\u00eates HTTP parall\u00e8les<\/em> avec JMeter.<\/p>\n

Oh\u00a0! Des requ\u00eates parall\u00e8les\u00a0!? Le vieux r\u00eave dans JMeter… certainement l’une des premi\u00e8res questions que j’ai pos\u00e9 <\/a>sur la mailing-list des utilisateurs<\/a> JMeter (jmeter-user).<\/p>\n

Bon, je vous pr\u00e9viens, il ne s’agit pas encore de faire un m\u00e9ga test de charge avec ce genre de requ\u00eates parall\u00e8les, mais cela peut aider pour des tests ayant des besoins de lancement simultan\u00e9 de requ\u00eates, ou toute autre id\u00e9e qui vous vient \u00e0 l’esprit.<\/p>\n

Le premier pr\u00e9-requis est donc d’avoir un JMeter pr\u00eat pour faire du Groovy<\/a>.<\/p>\n

Ensuite, nous allons utiliser HTTPBuilder<\/a>, qui est une couche API bas\u00e9e sur Apache HttpClient<\/a>, et accessible en Groovy. HTTPBuilder sait faire pas mal de choses (comme du parsing automatique <\/a>de requ\u00eates JSON), etc. Ici, nous allons dans ce billet seulement nous int\u00e9resser \u00e0 sa capacit\u00e9 \u00e0 faire des requ\u00eates HTTP de mani\u00e8re asynchrone.<\/p>\n

Le petit nom de ce type de requ\u00eate dans HTTPBuilder est AsyncHTTPBuilder<\/a>. C’est une requ\u00eate HTTP qui, au lieu d’\u00eatre ex\u00e9cut\u00e9e en premier plan, est envoy\u00e9e en arri\u00e8re-plan via une ex\u00e9cution dans un pool d’ex\u00e9cution (\u00e9l\u00e9ment Executor<\/a> dans l’API Java) et l’utilisation d’un type particulier\u00a0: java.util.concurrent.Future<\/a> pour le r\u00e9sultat de l’ex\u00e9cution de la requ\u00eate. Ce ‘future’ permet d’avoir la possibilit\u00e9 de lancer plusieurs requ\u00eates HTTP asynchrones (quasiment en m\u00eame temps), puis de r\u00e9colter le r\u00e9sultat de leurs ex\u00e9cutions ensuite.<\/p>\n

Pour utiliser le HTTPBuilder, il faut donc aller t\u00e9l\u00e9charger son archive<\/a> (au moins la version 0.5.2 SNAPSHOT, car il y a un bug dans la version 0.5.1 sur le AsyncHTTPBuilder)<\/em>, puis la d\u00e9compresser dans un r\u00e9pertoire temporaire.<\/p>\n

Au niveau des fichiers JAR n\u00e9cessaires au bon fonctionnement de HTTPBuilder, le plus simple est\u00a0: 1\/ copier le http-builder-0.5.2.jar<\/em> dans le r\u00e9pertoire JMETER_HOME\/lib, 2\/ copier l’ensemble de fichiers JAR situ\u00e9s dans le sous-r\u00e9pertoire HTTPBUILDER\/dependencies dans le r\u00e9pertoire JMETER_HOME\/lib. On relance ensuite JMeter.<\/p>\n

Voici l’arbre JMeter pour ce billet\u00a0:<\/p>\n

\"\"<\/p>\n

Dans le Plan de test<\/strong>, on place trois variables JMeter qui seront utilis\u00e9es par le script Groovy. Ce sont tout simplement le nom du site, son port et une URI.<\/p>\n

\"\"
\n<\/a><\/p>\n

Au niveau du Groupes d’unit\u00e9s<\/strong>, on laisse le 1-1-1 histoire de faciliter le cot\u00e9 d\u00e9monstration de ce sc\u00e9nario.<\/p>\n

\"\"<\/p>\n

L’\u00e9chantillon Requ\u00eate HTTP <\/strong>va permettre de r\u00e9cup\u00e9rer une page HTML qui contient des liens.<\/p>\n

\"\"
\n<\/a><\/p>\n

En fils de la Requ\u00eate HTTP<\/strong>, on place un \u00e9l\u00e9ment post-processeur Extracteur Expression r\u00e9guli\u00e8re<\/strong> qui est charg\u00e9 de r\u00e9cup\u00e9rer avec une expression r\u00e9guli\u00e8re les liens de la page HTML<\/p>\n

\"\"<\/p>\n

L’\u00e9chantillon D\u00e9bogage<\/strong> est bien entendu l\u00e0 \u00e0 des fins de d\u00e9bogage, histoire de voir si l’extracteur RegExp fait bien son travail.<\/p>\n

\"\"<\/p>\n

Ensuite, vient l’\u00e9l\u00e9ment principal de ce sc\u00e9nario\u00a0: l’\u00e9chantillon BSF abritant un script Groovy.<\/p>\n

\"\"<\/p>\n

Voici donc ce fameux script, les commentaires sont directement dedans\u00a0:<\/p>\n

import<\/strong><\/span> <\/span>static<\/strong><\/span> <\/span>groovyx.net.http.ContentType.HTML<\/span>\r\nimport<\/strong><\/span> <\/span>groovyx.net.http.AsyncHTTPBuilder<\/span><\/span><\/span>\r\n\/\/ R\u00e9cup\u00e9ration des variables JMeter<\/span><\/span><\/span>\r\ndef<\/strong><\/span> <\/span>myHost<\/span> <\/span>=<\/span>vars<\/span><\/span>.<\/span>get<\/span><\/span>(<\/span>\"MY_HOST\"<\/span>)<\/span>\r\ndef<\/strong><\/span> <\/span>myPort<\/span> <\/span>=<\/span> <\/span>vars<\/span><\/span>.<\/span>get<\/span><\/span>(<\/span>\"MY_PORT\"<\/span>)<\/span><\/span><\/span>\r\n\/\/ Construction du debut de l'URL<\/span><\/span><\/span>\r\ndef<\/strong><\/span> <\/span>myURL<\/span> <\/span>=<\/span> <\/span>\"http:\/\/\"<\/span> <\/span>+<\/span> <\/span>myHost<\/span> <\/span>+<\/span> <\/span>\":\"<\/span> <\/span>+<\/span> <\/span>myPort<\/span><\/span><\/span>\r\n\/\/ Recuperation du nombre d'elements, puis generation de la liste des URI<\/span><\/span><\/span>\r\ndef<\/strong><\/span> <\/span>listUri<\/span> <\/span>=<\/span> <\/span>[]<\/span>\r\ndef<\/strong><\/span> <\/span>nbPage<\/span> <\/span>=<\/span> <\/span>Integer.<\/span>parseInt<\/em><\/span>(<\/span>vars<\/span><\/span>.<\/span>get<\/span><\/span>(<\/span>\"PAGE_matchNr\"<\/span>))<\/span>\r\nfor<\/strong><\/span> <\/span>(<\/span>def<\/strong><\/span> <\/span>i<\/span> <\/span>=<\/span> <\/span>1<\/span>;<\/span> <\/span>i<\/span> <\/span><=<\/span> <\/span>nbPage;<\/span> <\/span>i++)<\/span> <\/span>{<\/span><\/span><\/span>\r\n <\/span>listUri<\/span> <\/span><<<\/span> <\/span>\"\/\"<\/span> <\/span>+<\/span> <\/span>vars<\/span><\/span>.<\/span>get<\/span><\/span>(<\/span>\"PAGE_\"<\/span> <\/span>+<\/span> <\/span>i)<\/span><\/span><\/span>\r\n}<\/span><\/span><\/span>\r\n\/\/ Creation d'un pool d'unites d'execution de requetes HTTP asynchrones<\/span><\/span><\/span>\r\ndef<\/strong><\/span> <\/span>http<\/span> <\/span>=<\/span> <\/span>new<\/strong><\/span> <\/span>AsyncHTTPBuilder(<\/span><\/span><\/span>\r\n\u00a0<\/span>poolSize<\/span> <\/span>:<\/span> <\/span>args<\/span><\/span>[<\/span>0<\/span>],<\/span><\/span><\/span>\r\n\u00a0<\/span>uri<\/span> <\/span>:<\/span> <\/span>myURL,<\/span><\/span><\/span>\r\n\u00a0<\/span>contentType<\/span> <\/span>:<\/span> <\/span>HTML<\/em><\/span>,<\/span><\/span><\/span>\r\n\u00a0<\/span>timeout<\/span> <\/span>:<\/span> <\/span>20000<\/span> <\/span>)<\/span><\/span><\/span>\r\n\/\/ Generation des requetes et lancer de chaque requete<\/span><\/span><\/span>\r\ndef<\/strong><\/span> <\/span>listResult<\/span> <\/span>=<\/span> <\/span>[]<\/span>\r\ndef<\/strong><\/span> <\/span>reqElt<\/span> <\/span>=<\/span> <\/span>\"\"<\/span> <\/span>\/\/ generation de la liste des requetes<\/span>\r\nlistUri.<\/span>each<\/em><\/span> <\/span>{<\/span> <\/span>uriPage<\/span> <\/span>-><\/span><\/span><\/span>\r\n\u00a0<\/span>listResult<\/span> <\/span><<<\/span> <\/span>http.get(path:uriPage)<\/span> <\/span>{<\/span> <\/span>resp,<\/span> <\/span>html<\/span> <\/span>-><\/span><\/span><\/span>\r\n\u00a0<\/span>println<\/em><\/span> <\/span>'Recuperation de '<\/span> <\/span>+<\/span> <\/span>uriPage<\/span><\/span><\/span>\r\n\u00a0<\/span>return<\/strong><\/span> <\/span>html<\/span><\/span><\/span>\r\n\u00a0<\/span>}<\/span><\/span><\/span>\r\n\u00a0<\/span>reqElt<\/span> <\/span>=<\/span> <\/span>reqElt<\/span> <\/span>+<\/span> <\/span>myURL<\/span> <\/span>+<\/span> <\/span>uriPage<\/span> <\/span>+<\/span> <\/span>\"\\n\"<\/span><\/span><\/span>\r\n}<\/span><\/span><\/span>\r\nSampleResult<\/span><\/span>.<\/span>setSamplerData<\/span><\/span>(reqElt)<\/span> <\/span>\/\/ pour rendre visible dans JMeter les requetes transmises<\/span><\/span><\/span>\r\n\/\/ Constrution des donnees de reponses\r\n\/\/ NB: l'appel \u00e0 it.get() pour chaque element va le faire patienter jusqu'a la fin d'execution de la requ\u00eate<\/span><\/span><\/span>\r\ndef<\/strong><\/span> <\/span>responseData<\/span> <\/span>=<\/span> <\/span>\"\"<\/span>\r\nlistResult.<\/span>each<\/em><\/span> <\/span>{<\/span><\/span><\/span>\r\n\u00a0<\/span>def<\/strong><\/span> <\/span>resp<\/span> <\/span>=<\/span> <\/span>it<\/span>.<\/span>get<\/span><\/span>()<\/span><\/span><\/span>\r\n\u00a0<\/span>responseData<\/span> <\/span>=<\/span> <\/span>responseData<\/span> <\/span>+<\/span> <\/span>\"=============\\n\"<\/span> <\/span>+<\/span> <\/span>resp<\/span> <\/span>+<\/span> <\/span>\"\\n\"<\/span><\/span><\/span>\r\n\u00a0<\/span>assert<\/strong><\/span> <\/span>resp<\/span> <\/span>instanceof<\/strong><\/span> <\/span>groovy.util.slurpersupport.GPathResult<\/span><\/span><\/span>\r\n}<\/span><\/span><\/span>\r\nSampleResult<\/span><\/span>.<\/span>setResponseData<\/span><\/span>(responseData)<\/span> <\/span>\/\/ envoi de la concatenation des resultats \u00e0 JMeter<\/span>\r\nprintln<\/span> <\/span>'done.'<\/span><\/span><\/span>\r\nhttp.shutdown()<\/span><\/span><\/span> <\/span><\/span><\/span>\/\/ Arret du pool d'unites<\/span><\/span><\/span><\/pre>\n
En compl\u00e9ment\u00a0:<\/span><\/p>\n