cronjob-primitive

CronJob Primitive Example

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

• Base Construction: Initializing a CronJob with a schedule, job template, and containers.
• Feature Mutations: Applying conditional changes (tracing env vars, metrics annotations, version-based image updates) using the Mutator.
• Suspension: Suspending the CronJob by setting spec.suspend = true.
• Data Extraction: Harvesting information from the reconciled resource.

Directory Structure

• app/: Defines the mock ExampleApp CRD and the controller that uses the component framework.
• features/: Contains modular feature definitions:
  • mutations.go: tracing env vars, metrics annotations, and version-based image updates.
• resources/: Contains the central NewCronJobResource factory that assembles all features using the cronjob.Builder.
• main.go: A standalone entry point that demonstrates a reconciliation loop using a fake client.

Running the Example

You can run this example directly using go run:

go run examples/cronjob-primitive/main.go

This will:

1. Initialize a fake Kubernetes client.
2. Create an ExampleApp owner object.
3. Reconcile the ExampleApp components through multiple spec changes.
4. Print the resulting status conditions.