Integrating Micronaut With GCP

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In this blog, we will cover how Micronaut is integrated with the Google Cloud Platform (GCP)

What is Micronaut

Micronaut is an open-source JVM-based software framework for building lightweight, modular applications and microservices.

Google Cloud

It is a provider of computing resources for developing, deploying, and operating applications on the Web.

Requirements

  • We will need a “micronaut-gcp-common” maven dependency in order to run our application on the Google Platform.
<dependency>
    <groupId>io.micronaut.gcp</groupId>
    <artifactId>micronaut-gcp-common</artifactId>
    <version>2.0.2</version>
</dependency>
  • We should have a Google Cloud account or a free trial account in order to set up a Google Cloud project on the console.
  • We can create a Google Cloud project from the Google Cloud UI itself or install the “gcloud CLI”.
  • It’s strongly recommended that you use a Service Account for your application.

Example

We are going to deploy a Micronaut application as an HTTP Function to Google Cloud

  • The Controller Class
micro-gcp
micro-gcp
micronaut-gcp
  • Next, Google Cloud requirements: We need a Google Cloud account and also a Google Cloud project.
micro-gcp
  • Deployment
    • Create an executable jar including all dependencies:
      ./mvnw package
  • You need a single JAR. Delete every ‘jar’ except <you_project_name>-0.1.jar in your target directory (where the jar is present).
  • Next run:
      gcloud functions deploy <project_name>
       --entry-point io.micronaut.gcp.function.http.HttpFunction
       --runtime java11
       --trigger-http
  • To get the trigger URL, do the following:
      YOUR_HTTP_TRIGGER_URL=$(gcloud functions describe <project_name>
       --format='value(httpsTrigger.url)')
  • Now using the above variable we can test the function invocation:
      curl -w "\n" $YOUR_HTTP_TRIGGER_URL/<your_endpoint>
  • Finally, we will see the below response on this trigger URL:
      Example Response

Conclusion

Hence, we have seen above how to integrate Micornaut with the Google platform with an example of how to deploy a Micronaut application as an HTTP Function to Google Cloud and get the response using the trigger URL.

References

https://cloud.google.com/

https://guides.micronaut.io/

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