Go Struct to POJO Generator using Fabric8 Model Generators

This project is a demonstration of how you can generate POJOs for your Custom Resources if you already have go structs for your Custom Resource types. You can then easily use there generated POJOs in Fabric8 Kubernetes Client typed API for Custom Resources. We at Fabric8 Kubernetes Client team have been generating POJOs for Kubernetes resources from go structs. We also have extensions for Knative, Tekton and Service Catalog which generate model on the same principle. This project just uses the generators used by Fabric8 Kubernetes Client and tries to provide a generic way to generate your own Custom Resource POJOs by just providing simple configuration file.

How to Build?

You just need to do a basic mvn compile or mvn clean install to build this project.

How to Generate POJOs for Custom Resources from Go Structs?

You just need to provide a basic JSON file with details of where your go packages are located, what package shall your package go to? You need to create input.json file inside src/main/resources/generator/ directory. Let's see an example of structs being provided inside official Kubernetes Sample Controller repository:

This is how your input.json should look like:

{
    "name": "SampleController",
    "packages": [
    {
        "name":"samplecontroller",
        "goPackage": "k8s.io/sample-controller/pkg/apis/samplecontroller/v1alpha1",
        "javaPackage": "io.kubernetes.samplecontroller.api.model",
        "apiGroup":"samplecontroller.k8s.io",
        "apiVersion": "v1alpha1",
        "types": [
           {"name":"Foo", "namespaced":true}
        ]
    }
    ]
}

You need to provide this minimal JSON file while running the jar-with-deps generated in this project:

java -jar -DinputFile=input.json kubernetes-model-code-generator-1.0.0-SNAPSHOT-jar-with-dependencies.jar

Once build is finished. You'll notice that it created a folder with model contents in the directory your executed jar:

fabric8-gostruct2pojogenerator-test : $ tree SampleController/ -L 1
SampleController/
 generator
 model
 pom.xml

You can find your POJOs in model/target/generated-sources directory:

fabric8-gostruct2pojogenerator-test : $ tree SampleController/model/target/generated-sources/
SampleController/model/target/generated-sources/
 annotations
  io
      fabric8
       kubernetes
           api
               model
                   DoneableModelSchema.java
                   ModelSchemaBuilder.java
                   ModelSchemaFluentImpl.java
                   ModelSchemaFluent.java
      kubernetes
          samplecontroller
              api
                  model
                      DoneableFoo.java
                      DoneableFooList.java
                      DoneableFooSpec.java
                      DoneableFooStatus.java
                      FooBuilder.java
                      FooFluentImpl.java
                      FooFluent.java
                      FooListBuilder.java
                      FooListFluentImpl.java
                      FooListFluent.java
                      FooSpecBuilder.java
                      FooSpecFluentImpl.java
                      FooSpecFluent.java
                      FooStatusBuilder.java
                      FooStatusFluentImpl.java
                      FooStatusFluent.java
 io
     fabric8
      kubernetes
          api
              model
                  ModelSchema.java
     kubernetes
         samplecontroller
             api
                 model
                     Foo.java
                     FooList.java
                     FooSpec.java
                     FooStatus.java

19 directories, 25 files