Move service instance to commons

[wind57]

No description provided.

[wind57]

tests were moved to commons, not deleted

[wind57]

this method has changed from the way it used to exist in fabric8 implementation. For example it takes as input a Supplier<InstanceIdHostPodName>, where:

/**
 * computes instanceId, host and podName. All needed when calculating ServiceInstance.
 * @author wind57
 */
public record InstanceIdHostPodName(String instanceId, String host, String podName) {
}

instanceId, host and podName are computed based on specific fabric8 EndpointAddress/Service:

final class Fabric8InstanceIdHostPodNameSupplier implements Supplier<InstanceIdHostPodName> {

	private final EndpointAddress endpointAddress;

	private final Service service;

	Fabric8InstanceIdHostPodNameSupplier(EndpointAddress endpointAddress, Service service) {
		this.endpointAddress = endpointAddress;
		this.service = service;
	}

	@Override
	public InstanceIdHostPodName get() {
		return new InstanceIdHostPodName(instanceId(), host(), podName());
	}

	// instanceId is usually the pod-uid as seen in the .metadata.uid
	private String instanceId() {
		return Optional.ofNullable(endpointAddress).map(EndpointAddress::getTargetRef).map(ObjectReference::getUid)
				.orElseGet(() -> service.getMetadata().getUid());
	}

	private String host() {
		return Optional.ofNullable(endpointAddress).map(EndpointAddress::getIp)
				.orElseGet(() -> service.getSpec().getExternalName());
	}

	private String podName() {
		return Optional.ofNullable(endpointAddress).map(EndpointAddress::getTargetRef)
				.filter(objectReference -> "Pod".equals(objectReference.getKind())).map(ObjectReference::getName)
				.orElse(null);
	}
}

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The logic is exactly the same as it used to be, but a Supplier/Function is needed so that I can pass into this method from commons both fabric8 and in the nearest future: k8s code.

[wind57]

Last PR before I start working on k8s integration with all these moved methods

[wind57]

exactly the same logic is preserved, tests ensure this

[wind57]

@ryanjbaxter ready to be looked at. This is a bit more involved, but in essence it does not change anything "business related". It just makes sure that instead of passing fabric8 specific stuff to serviceInstance common method, it passes things independent of the client. For example instead of a:

• service name
• service labels
• service annotations

it now expects a ServiceMetadataForServiceInstance - that encapsulates those 3 fields above.

---

Another example would be that serviceMetadata that now lives in commons package, expects a Function<String, PodLabelsAndAnnotations>, or simpler a way to get:

• pod labels
• pod annotations

from a String (podName). This being a Function actually will call:

Fabric8PodLabelsAndAnnotationsSupplier for fabric8 and K8sPodLabelsAndAnnotationsSupplier in one of the future PRs.

This is needed so that commons does not care what client we use, thus I can delegate to the same common code.
I hope this makes sense.