register.go contains the function which creates a client which is aware of our crd

register.go

package v1alpha1

import (
	meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/apimachinery/pkg/runtime/serializer"
	"k8s.io/client-go/rest"
)

var SchemeGroupVersion = schema.GroupVersion{Group: CRDGroup, Version: CRDVersion}

func addKnownTypes(scheme *runtime.Scheme) error {
	scheme.AddKnownTypes(SchemeGroupVersion,
		&SslConfig{},
		&SslConfigList{},
	)
	meta_v1.AddToGroupVersion(scheme, SchemeGroupVersion)
	return nil
}

func NewClient(cfg *rest.Config) (*SslConfigV1Alpha1Client, error) {
	scheme := runtime.NewScheme()
	SchemeBuilder := runtime.NewSchemeBuilder(addKnownTypes)
	if err := SchemeBuilder.AddToScheme(scheme); err != nil {
		return nil, err
	}
	config := *cfg
	config.GroupVersion = &SchemeGroupVersion
	config.APIPath = "/apis"
	config.ContentType = runtime.ContentTypeJSON
	config.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: serializer.NewCodecFactory(scheme)}
	client, err := rest.RESTClientFor(&config)
	if err != nil {
		return nil, err
	}
	return &SslConfigV1Alpha1Client{restClient: client}, nil
}