Circuit Breaker - Node.js Booster

Important

This runs best when deployed to OpenShift in order to use the circuit breaker functionality. For more details on using this booster with a single-node OpenShift cluster, CI/CD deployments, as well as the rest of the runtime, see the Node.js Runtime Guide.

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Run this Booster on a Single-node OpenShift Cluster

If you have a single-node OpenShift cluster, such as Minishift or the Red Hat Container Development Kit, installed and running, you can also deploy your booster there. A single-node OpenShift cluster provides you with access to a cloud environment that is similar to a production environment.

To deploy your booster to a running single-node OpenShift cluster:

1. Log in and create your project.

   $ ${gitCMD}
   
   $ cd cb-test
   
   $ oc login -u developer -p developer
   
   $ oc new-project MY_PROJECT_NAME
   
   $ ${OSORunCMD}

Interact with this Booster on a Single-node OpenShift Cluster

To interact with your booster while it’s running on a Single-node OpenShift Cluster, you first need to obtain it’s URL:

$ oc get route ${greeting-app-name} -o jsonpath={$.spec.host}

${greeting-app-name}-MY_PROJECT_NAME.LOCAL_OPENSHIFT_HOSTNAME

$ oc get route ${name-app-name} -o jsonpath={$.spec.host}

${name-app-name}-MY_PROJECT_NAME.LOCAL_OPENSHIFT_HOSTNAME

You can use the form at your application’s url or you can use the curl command:

$ curl http://${greeting-app-name}-MY_PROJECT_NAME.LOCAL_OPENSHIFT_HOSTNAME/api/greeting
{"content":"Hello, World!"}

$ curl -X PUT -H "Content-Type: application/json" -d '{"state": "fail"}' http://${name-app-name}-MY_PROJECT_NAME.LOCAL_OPENSHIFT_HOSTNAME/api/state

$ curl http://${greeting-app-name}-MY_PROJECT_NAME.LOCAL_OPENSHIFT_HOSTNAME/api/greeting
{"content":"Hello, Fallback!"}

$ curl -X PUT -H "Content-Type: application/json" -d '{"state": "ok"}' http://${name-app-name}-MY_PROJECT_NAME.LOCAL_OPENSHIFT_HOSTNAME/api/state

$ curl http://${greeting-app-name}-MY_PROJECT_NAME.LOCAL_OPENSHIFT_HOSTNAME/api/greeting
{"content":"Hello, World!"}

More Information

You can learn more about this booster and rest of the Node.js runtime in the Node.js Runtime Guide.