utils/kubernetes/service.go

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package kubernetes

import (
	"net/url"

	v1 "k8s.io/api/core/v1"
	"knative.dev/pkg/apis"
)

// TODO: retrieve the cluster domain from the /etc/resolve inside the pod or from the Platform CRD - will be addressed by KOGITO-9198
var defaultClusterDomain = "svc.cluster.local"

// retrieveServiceHost function that based on the service name, namespace and eventually the nodeport, will provide the service URI
func retrieveServiceHost(service *v1.Service) string {
	namespace := service.Namespace
	if len(namespace) == 0 {
		namespace = "default"
	}
	// TODO: Retrieve the cluster domain or use the default one
	return service.Name + "." + namespace + "." + defaultClusterDomain
}

// RetrieveServiceURL function that based on the service name, namespace and eventually the nodeport, will provide the service URI
func RetrieveServiceURL(service *v1.Service) (*apis.URL, error) {
	url := url.URL{
		Scheme: "http",
		Host:   retrieveServiceHost(service),
		Path:   service.Name}
	return apis.ParseURL(url.String())
}

// GetServicePortByName returns a pointer to the ServicePort within the given Service.
// If none found, returns nil.
// It also returns the position where the service port por was found, -1 if none.
func GetServicePortByName(name string, service *v1.Service) (*v1.ServicePort, int) {
	if service == nil {
		return nil, -1
	}
	for i, servicePort := range service.Spec.Ports {
		if name == servicePort.Name {
			return &servicePort, i
		}
	}
	return nil, -1
}