clusterrolebinding-primitive

ClusterRoleBinding Primitive Example

This example demonstrates the usage of the clusterrolebinding primitive within the operator component framework. It shows how to manage a Kubernetes ClusterRoleBinding as a component of a larger application, utilising features like:

• Base Construction: Initializing a ClusterRoleBinding with a roleRef and base subjects.
• Feature Mutations: Adding subjects conditionally via feature-gated mutations using EditSubjects.
• Metadata Mutations: Setting version labels on the ClusterRoleBinding via EditObjectMetadata.
• Data Extraction: Inspecting ClusterRoleBinding state after each reconcile cycle.

Directory Structure

• app/: Defines the controller that uses the component framework. The ExampleApp CRD is shared from examples/shared/app.
• features/: Contains modular feature definitions:
  • mutations.go: version labelling and feature-gated monitoring subject addition.
• resources/: Contains the central NewClusterRoleBindingResource factory that assembles all features using clusterrolebinding.Builder.
• main.go: A standalone entry point that demonstrates building and mutating a ClusterRoleBinding through multiple spec variations.

Running the Example

go run examples/clusterrolebinding-primitive/main.go

This will:

1. Create an in-memory ExampleApp owner object.
2. For each of three spec variations, build a fresh resource and apply mutations to a simulated current ClusterRoleBinding.
3. Print the reconciled ClusterRoleBinding state (labels, roleRef, subjects) after each mutation cycle.