/
conversion.go
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/
conversion.go
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// Copyright Istio Authors
//
// Licensed 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 kube
import (
"strings"
coreV1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"istio.io/api/annotation"
"istio.io/istio/pilot/pkg/features"
"istio.io/istio/pilot/pkg/model"
"istio.io/istio/pilot/pkg/serviceregistry/provider"
"istio.io/istio/pkg/cluster"
"istio.io/istio/pkg/config/constants"
"istio.io/istio/pkg/config/host"
"istio.io/istio/pkg/config/kube"
"istio.io/istio/pkg/config/visibility"
"istio.io/istio/pkg/spiffe"
)
const (
// IngressClassAnnotation is the annotation on ingress resources for the class of controllers
// responsible for it
IngressClassAnnotation = "kubernetes.io/ingress.class"
// NodeSelectorAnnotation is the value for this annotation is a set of key value pairs (node labels)
// that can be used to select a subset of nodes from the pool of k8s nodes
// It is used for multi-cluster scenario, and with nodePort type gateway service.
// TODO: move to API
NodeSelectorAnnotation = "traffic.istio.io/nodeSelector"
)
func convertPort(port coreV1.ServicePort) *model.Port {
return &model.Port{
Name: port.Name,
Port: int(port.Port),
Protocol: kube.ConvertProtocol(port.Port, port.Name, port.Protocol, port.AppProtocol),
}
}
func ConvertService(svc coreV1.Service, domainSuffix string, clusterID cluster.ID) *model.Service {
addr := constants.UnspecifiedIP
resolution := model.ClientSideLB
meshExternal := false
if svc.Spec.Type == coreV1.ServiceTypeExternalName && svc.Spec.ExternalName != "" {
resolution = model.DNSLB
meshExternal = true
}
if svc.Spec.ClusterIP == coreV1.ClusterIPNone { // headless services should not be load balanced
resolution = model.Passthrough
} else if svc.Spec.ClusterIP != "" {
addr = svc.Spec.ClusterIP
}
ports := make([]*model.Port, 0, len(svc.Spec.Ports))
for _, port := range svc.Spec.Ports {
ports = append(ports, convertPort(port))
}
var exportTo map[visibility.Instance]bool
serviceaccounts := make([]string, 0)
if svc.Annotations[annotation.AlphaCanonicalServiceAccounts.Name] != "" {
serviceaccounts = append(serviceaccounts, strings.Split(svc.Annotations[annotation.AlphaCanonicalServiceAccounts.Name], ",")...)
}
if svc.Annotations[annotation.AlphaKubernetesServiceAccounts.Name] != "" {
for _, ksa := range strings.Split(svc.Annotations[annotation.AlphaKubernetesServiceAccounts.Name], ",") {
serviceaccounts = append(serviceaccounts, kubeToIstioServiceAccount(ksa, svc.Namespace))
}
}
if svc.Annotations[annotation.NetworkingExportTo.Name] != "" {
namespaces := strings.Split(svc.Annotations[annotation.NetworkingExportTo.Name], ",")
exportTo = make(map[visibility.Instance]bool, len(namespaces))
for _, ns := range namespaces {
exportTo[visibility.Instance(ns)] = true
}
}
istioService := &model.Service{
Hostname: ServiceHostname(svc.Name, svc.Namespace, domainSuffix),
ClusterVIPs: model.AddressMap{
Addresses: map[cluster.ID][]string{
clusterID: {addr},
},
},
Ports: ports,
DefaultAddress: addr,
ServiceAccounts: serviceaccounts,
MeshExternal: meshExternal,
Resolution: resolution,
CreationTime: svc.CreationTimestamp.Time,
ResourceVersion: svc.ResourceVersion,
Attributes: model.ServiceAttributes{
ServiceRegistry: provider.Kubernetes,
Name: svc.Name,
Namespace: svc.Namespace,
Labels: svc.Labels,
ExportTo: exportTo,
LabelSelectors: svc.Spec.Selector,
},
}
switch svc.Spec.Type {
case coreV1.ServiceTypeNodePort:
if _, ok := svc.Annotations[NodeSelectorAnnotation]; !ok {
// only do this for istio ingress-gateway services
break
}
// store the service port to node port mappings
portMap := make(map[uint32]uint32)
for _, p := range svc.Spec.Ports {
portMap[uint32(p.Port)] = uint32(p.NodePort)
}
istioService.Attributes.ClusterExternalPorts = map[cluster.ID]map[uint32]uint32{clusterID: portMap}
// address mappings will be done elsewhere
case coreV1.ServiceTypeLoadBalancer:
if len(svc.Status.LoadBalancer.Ingress) > 0 {
var lbAddrs []string
for _, ingress := range svc.Status.LoadBalancer.Ingress {
if len(ingress.IP) > 0 {
lbAddrs = append(lbAddrs, ingress.IP)
} else if len(ingress.Hostname) > 0 {
// DO NOT resolve the DNS here. In environments like AWS, the ELB hostname
// does not have a repeatable DNS address and IPs resolved at an earlier point
// in time may not work. So, when we get just hostnames instead of IPs, we need
// to smartly switch from EDS to strict_dns rather than doing the naive thing of
// resolving the DNS name and hoping the resolution is one-time task.
lbAddrs = append(lbAddrs, ingress.Hostname)
}
}
if len(lbAddrs) > 0 {
istioService.Attributes.ClusterExternalAddresses.SetAddressesFor(clusterID, lbAddrs)
}
}
}
istioService.Attributes.ClusterExternalAddresses.AddAddressesFor(clusterID, svc.Spec.ExternalIPs)
return istioService
}
func ExternalNameServiceInstances(k8sSvc *coreV1.Service, svc *model.Service) []*model.ServiceInstance {
if k8sSvc == nil || k8sSvc.Spec.Type != coreV1.ServiceTypeExternalName || k8sSvc.Spec.ExternalName == "" {
return nil
}
out := make([]*model.ServiceInstance, 0, len(svc.Ports))
discoverabilityPolicy := model.AlwaysDiscoverable
if features.EnableMCSServiceDiscovery {
// MCS spec does not allow export of external name services.
// See https://github.com/kubernetes/enhancements/tree/master/keps/sig-multicluster/1645-multi-cluster-services-api#exporting-services.
discoverabilityPolicy = model.DiscoverableFromSameCluster
}
for _, portEntry := range svc.Ports {
out = append(out, &model.ServiceInstance{
Service: svc,
ServicePort: portEntry,
Endpoint: &model.IstioEndpoint{
Address: k8sSvc.Spec.ExternalName,
EndpointPort: uint32(portEntry.Port),
ServicePortName: portEntry.Name,
Labels: k8sSvc.Labels,
DiscoverabilityPolicy: discoverabilityPolicy,
},
})
}
return out
}
// NamespacedNameForK8sObject is a helper that creates a NamespacedName for the given K8s Object.
func NamespacedNameForK8sObject(obj metav1.Object) types.NamespacedName {
return types.NamespacedName{
Namespace: obj.GetNamespace(),
Name: obj.GetName(),
}
}
// ServiceHostname produces FQDN for a k8s service
func ServiceHostname(name, namespace, domainSuffix string) host.Name {
return host.Name(name + "." + namespace + "." + "svc" + "." + domainSuffix) // Format: "%s.%s.svc.%s"
}
// ServiceHostnameForKR calls ServiceHostname with the name and namespace of the given kubernetes resource.
func ServiceHostnameForKR(obj metav1.Object, domainSuffix string) host.Name {
return ServiceHostname(obj.GetName(), obj.GetNamespace(), domainSuffix)
}
// kubeToIstioServiceAccount converts a K8s service account to an Istio service account
func kubeToIstioServiceAccount(saname string, ns string) string {
return spiffe.MustGenSpiffeURI(ns, saname)
}
// SecureNamingSAN creates the secure naming used for SAN verification from pod metadata
func SecureNamingSAN(pod *coreV1.Pod) string {
return spiffe.MustGenSpiffeURI(pod.Namespace, pod.Spec.ServiceAccountName)
}
// PodTLSMode returns the tls mode associated with the pod if pod has been injected with sidecar
func PodTLSMode(pod *coreV1.Pod) string {
if pod == nil {
return model.DisabledTLSModeLabel
}
return model.GetTLSModeFromEndpointLabels(pod.Labels)
}
// KeyFunc is the internal API key function that returns "namespace"/"name" or
// "name" if "namespace" is empty
func KeyFunc(name, namespace string) string {
if len(namespace) == 0 {
return name
}
return namespace + "/" + name
}