mirror of https://github.com/knative/pkg.git
93 lines
2.9 KiB
Go
93 lines
2.9 KiB
Go
/*
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Copyright 2019 The Knative Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package ingress
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import (
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"context"
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"fmt"
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"os"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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)
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const (
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// TODO(tcnghia): These probably shouldn't be hard-coded here?
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istioIngressNamespace = "istio-system"
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istioIngressName = "istio-ingressgateway"
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)
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// GetIngressEndpoint gets the ingress public IP or hostname.
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// address - is the endpoint to which we should actually connect.
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// portMap - translates the request's port to the port on address to which the caller
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//
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// should connect. This is used when the resolution to address goes through some
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// sort of port-mapping, e.g. Kubernetes node ports.
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//
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// err - an error when address/portMap cannot be established.
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func GetIngressEndpoint(ctx context.Context, kubeClientset kubernetes.Interface, endpointOverride string) (address string, portMap func(string) string, err error) {
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ingressName := istioIngressName
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if gatewayOverride := os.Getenv("GATEWAY_OVERRIDE"); gatewayOverride != "" {
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ingressName = gatewayOverride
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}
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ingressNamespace := istioIngressNamespace
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if gatewayNsOverride := os.Getenv("GATEWAY_NAMESPACE_OVERRIDE"); gatewayNsOverride != "" {
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ingressNamespace = gatewayNsOverride
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}
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ingress, err := kubeClientset.CoreV1().Services(ingressNamespace).Get(ctx, ingressName, metav1.GetOptions{})
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if err != nil {
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return "", nil, err
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}
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// If an override is provided, use it
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if endpointOverride != "" {
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return endpointOverride, func(port string) string {
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for _, sp := range ingress.Spec.Ports {
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if fmt.Sprint(sp.Port) == port {
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return fmt.Sprint(sp.NodePort)
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}
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}
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return port
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}, nil
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}
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endpoint, err := EndpointFromService(ingress)
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if err != nil {
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return "", nil, err
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}
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return endpoint, func(in string) string { return in }, nil
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}
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// EndpointFromService extracts the endpoint from the service's ingress.
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func EndpointFromService(svc *v1.Service) (string, error) {
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ingresses := svc.Status.LoadBalancer.Ingress
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if len(ingresses) != 1 {
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return "", fmt.Errorf("expected exactly one ingress load balancer, instead had %d: %v", len(ingresses), ingresses)
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}
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itu := ingresses[0]
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switch {
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case itu.IP != "":
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return itu.IP, nil
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case itu.Hostname != "":
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return itu.Hostname, nil
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default:
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return "", fmt.Errorf("expected ingress loadbalancer IP or hostname for %s to be set, instead was empty", svc.Name)
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}
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}
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