[jboss-user] [JBoss Tools] - show-domain-info: openshift-java-client in a nutshell

Fri Aug 24 11:05:03 EDT 2012

Andre Dietisheim [https://community.jboss.org/people/adietish] modified the blog post:

"show-domain-info: openshift-java-client in a nutshell"

To view the blog post, visit: https://community.jboss.org/community/tools/blog/2012/08/24/show-domain-info-openshift-java-client-in-a-nutshell

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At JBoss Tools we created a java client that allows you to talk to the  https://openshift.redhat.com/app/ OpenShift PaaS:  https://github.com/openshift/openshift-java-client openshift-java-client. The library is already used in the  https://community.jboss.org/en/tools/blog/tags/openshift OpenShift tooling in  http://www.jboss.org/tools/ JBoss Tools, the  https://github.com/forge/plugin-openshift-express/ Forge plugin and  http://www.appcelerator.com/platform/titanium-studio Appcelerators tooling for OpenShift.
This blog post will show you how to use okthis API in your very own java programs. We'll develop a command line tool that displays informations equivalent to what you get when running *rhc domain show* with the  https://openshift.redhat.com/community/developers/install-the-client-tools OpenShift command line tools: It displays basic informations about your user.

User Info
=========
Namespace: andre
  RHLogin: andre.dietisheim at redhat.com

Application Info
================
kitchensink
    Framework: jbossas-7
     Creation: 2012-08-10T11:24:13-04:00
         UUID: 8ad0d94f39aa4295a0049de8b8b5ef55
      Git URL: ssh://<SOMEID>@kitchensink-andre.rhcloud.com/~/git/kitchensink.git/
   Public URL: http://kitchensink-andre.rhcloud.com/

 Embedded: 
      jenkins-client-1.4 - Job URL: https://jenk-andre.rhcloud.com/job/kitchensink-build/

You'll find the sourcecode for this example at github:  https://github.com/adietish/show-domain-info https://github.com/adietish/show-domain-info. All the code that is shown in this blog is contained within the  https://github.com/adietish/show-domain-info/blob/master/src/main/java/com/redhat/openshift/examples/domaininfo/Main.java Main class.

If you want to dig futher, you'll get a more complete example that includes jenkins in  https://community.jboss.org/docs/DOC-19828 this wiki article.
h1. Openshift-java-client 2.0
The  https://github.com/openshift/openshift-java-client openshift-java-client is a java library that allows java programs to talk to the OpenShift PaaS. It talks to the new OpenShift  https://openshift.redhat.com/community/sites/default/files/documents/OpenShift-2.0-REST_API_Guide-en-US.pdf RESTful service and allows users to create, modify and destroy OpenShift resources: domains, applications, cartridges, etc.It is hosted on github at  https://github.com/openshift/openshift-java-client https://github.com/openshift/openshift-java-client and is available under the  http://www.eclipse.org/legal/epl-v10.html Ecilpse Public License.
h1. Requirements
* You need an account on OpenShift. (If you have no account yet, you'd have to  https://openshift.redhat.com/app/account/new signup first)
* Make sure you have an OpenShift domain and some applications (to get some meaningful output)
h1. Launch Parameters
To keep the implemenation simple, the program we're about to write, only accept 2 parameters on the command line:

1. username
2. password

Launching the program with maven would look like this:
mvn test -Dusername=<username> -Dpassword=<password>
h1. Project Setup
We have to make sure that we have the  https://github.com/openshift/openshift-java-client openshift-java-client available on our classpath. The client library is available at  https://github.com/openshift/openshift-java-client https://github.com/openshift/openshift-java-client. You could clone the repo and build your own jar by telling maven to "mvn clean package". But even simpler is to add it as dependency to your  https://github.com/adietish/show-domain-info/blob/master/pom.xml#L8 pom, since the client library is available from central as maven artifact:
<dependency>
          <groupId>com.openshift</groupId>
          <artifactId>openshift-java-client</artifactId>
          <version>2.0.0</version>
</dependency>

h1. Connect to OpenShift
After we did some basic command line parameter parsing (that we skipped here on puropose) we'd have to get in touch with the OpenShift PaaS. Using the  https://github.com/openshift/openshift-java-client openshift-java-client you'd tell the  https://github.com/adietish/openshift-java-client/blob/master/src/main/java/com/openshift/client/OpenShiftConnectionFactory.java OpenShiftConnectionFactory to create a connection for you. To create this connection you'll have to provide some parameters: 
h3. Server url
First of all you need to give it the url of the OpenShift PaaS. You may either hard code it or ask the OpenShift configuration for it:
new OpenShiftConfiguration().getLibraServer()

The OpenShiftConfiguration class parses the OpenShift  http://docs.redhat.com/docs/en-US/OpenShift/2.0/html/Getting_Started_Guide/sect-Getting_Started_Guide-OpenShift_Client_Tools-Configuring_Client_Tools.html configuration files you may have on your machine (~/.openshift/express.conf, C:/Documents and Settings/user/.openshift/express.conf etc.). Those usually get created once you installed the  http://docs.redhat.com/docs/en-US/OpenShift/2.0/html/User_Guide/chap-User_Guide-OpenShift_Command_Line_Interface.html rhc command line tools. In case you dont have any configuration yet,  https://github.com/adietish/openshift-java-client/blob/master/src/main/java/com/openshift/client/configuration/OpenShiftConfiguration.java OpenShiftConfiguration holds some meaningful  https://github.com/openshift/openshift-java-client/blob/master/src/main/java/com/openshift/client/configuration/DefaultConfiguration.java defaults and points to  http://openshift.redhat.com http://openshift.redhat.com. On the other hand, our configuration class also allows you to override settings by putting them to the  https://github.com/openshift/openshift-java-client/blob/master/src/main/java/com/openshift/client/configuration/SystemProperties.java system configuration as you would do if you want to switch to the OpenShift  https://openshift.redhat.com/community/wiki/getting-started-with-openshift-origin-livecd liveCD temporarly. You would then simply add the following to the command line when launching the java virtual machine:
-Dlibra_server=127.0.0.1

h3. Client id
The connection factory also requires you to provide your very own client id. This client id is used when the openshift-java-client talks to the OpenShift REST service. It'll get included in the user-agent string that tells OpenShift what client it is talking to. We use the name of our example, "show-domain-info".
h3. Username and Password
Last but not least, you also have to give it your OpenShift credentials, the ones we got from the command-line.

String openshiftServer = new OpenShiftConfiguration().getLibraServer();
IOpenShiftConnection connection = new OpenShiftConnectionFactory().getConnection("show-domain-info", "myuser", "mypassword", openshiftServer);

Once you have your connection you can get a  https://github.com/openshift/openshift-java-client/blob/master/src/main/java/com/openshift/client/IUser.java IUser instance which will allow you to create your domain and applications:
IUser user = connection.getUser();

h1. Print the User Infos
The first information block involves basic user informations. The username is available from your  https://github.com/adietish/openshift-java-client/blob/master/src/main/java/com/openshift/client/IUser.java IUser instance:
System.out.println("RHLogin:\t" + user.getRhlogin());

The other value that we want to display, the domain namespace, is accessible from your OpenShift  https://github.com/adietish/openshift-java-client/blob/master/src/main/java/com/openshift/client/IDomain.java IDomain. We'll get it from the the user instance and print its id (namespace).
IDomain domain = user.getDefaultDomain();
System.out.println("Namespace:\t" + domain.getId());

h1. Print the Application Infos
The second portion printed by "rhc domain show" is reporting your users applications. All OpenShift applications are held in a list within your domain. We simply get the list and iterate over it's entries:
for (IApplication application : domain.getApplications()) {

The required values - name, framework, creation time etc. - are now available within each  https://github.com/adietish/openshift-java-client/blob/master/src/main/java/com/openshift/client/IApplication.java IApplication instance:
System.out.println(application.getName());
System.out.println("\tFramework:\t" + application.getCartridge().getName());
System.out.println("\tCreation:\t" + application.getCreationTime());
System.out.println("\tUUID:\t\t" + application.getUUID());
System.out.println("\tGit URL:\t" + application.getGitUrl());
System.out.println("\tPublic URL:\t" + application.getApplicationUrl() + "\n");

An application may have several cartridges embedded (MySql, Postgres, Jenkins etc.). These cartridges are reported by by the application. We get the list of cartridges and inspect at each of them:
for(IEmbeddedCartridge cartridge : application.getEmbeddedCartridges()) {

We then want to know bout a cartridge's ( https://github.com/adietish/openshift-java-client/blob/master/src/main/java/com/openshift/client/IEmbeddedCartridge.java IEmbeddedCartridge), name and url:
System.out.println("\t" + cartridge.getName() + " - URL:" + cartridge.getUrl());

That is it - you now have an app that can talk to OpenShift via its  https://openshift.redhat.com/community/sites/default/files/documents/OpenShift-2.0-REST_API_Guide-en-US.pdf REST API. If you want to do more we also have this  https://community.jboss.org/docs/DOC-19828 article that shows how to perform actual operations against your OpenShift applications. Hope you enjoy it and let us know what you build with it!
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