Opal Maintenance Service

The application exposes health endpoint (http://localhost:4550/health) and metrics endpoint (http://localhost:4550/metrics).

Plugins

This project contains the following plugins:

• checkstyle

  https://docs.gradle.org/current/userguide/checkstyle_plugin.html

  Performs code style checks on Java source files using Checkstyle and generates reports from these checks. The checks are included in gradle's check task (you can run them by executing ./gradlew check command).

• pmd

  https://docs.gradle.org/current/userguide/pmd_plugin.html

  Performs static code analysis to finds common programming flaws. Included in gradle check task.

• jacoco

  https://docs.gradle.org/current/userguide/jacoco_plugin.html

  Provides code coverage metrics for Java code via integration with JaCoCo. You can create the report by running the following command:

    ./gradlew jacocoTestReport

  The report will be created in build/reports subdirectory in your project directory.

• io.spring.dependency-management

  https://github.com/spring-gradle-plugins/dependency-management-plugin

  Provides Maven-like dependency management. Allows you to declare dependency management using dependency 'groupId:artifactId:version' or dependency group:'group', name:'name', version:version'.

• org.springframework.boot

  http://projects.spring.io/spring-boot/

  Reduces the amount of work needed to create a Spring application

• org.owasp.dependencycheck

  https://jeremylong.github.io/DependencyCheck/dependency-check-gradle/index.html

  Provides monitoring of the project's dependent libraries and creating a report of known vulnerable components that are included in the build. To run it execute gradle dependencyCheck command.

• com.github.ben-manes.versions

  https://github.com/ben-manes/gradle-versions-plugin

  Provides a task to determine which dependencies have updates. Usage:

    ./gradlew dependencyUpdates -Drevision=release

Setup

Located in ./bin/init.sh. Simply run and follow the explanation how to execute it.

Building and deploying the application

Building the application

The project uses Gradle as a build tool. It already contains ./gradlew wrapper script, so there's no need to install gradle.

To build the project execute the following command:

  ./gradlew build

Running the application

Create the image of the application by executing the following command:

  ./gradlew assemble

Create docker image:

  docker-compose build

Run the distribution (created in build/install/opal-maintenance-service directory) by executing the following command:

  docker-compose up

This will start the API container exposing the application's port (set to 4550 in this app).

In order to test if the application is up, you can call its health endpoint:

  curl http://localhost:4550/health

You should get a response similar to this:

  {"status":"UP","diskSpace":{"status":"UP","total":249644974080,"free":137188298752,"threshold":10485760}}

Alternative script to run application

To skip all the setting up and building, just execute the following command:

./bin/run-in-docker.sh

For more information:

./bin/run-in-docker.sh -h

Script includes bare minimum environment variables necessary to start api instance. Whenever any variable is changed or any other script regarding docker image/container build, the suggested way to ensure all is cleaned up properly is by this command:

docker-compose rm

It clears stopped containers correctly. Might consider removing clutter of images too, especially the ones fiddled with:

docker images

docker image rm <image-id>

There is no need to remove postgres and java or similar core images.

License

This project is licensed under the MIT License - see the LICENSE file for details