/
service.go
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/
service.go
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package psmdb
import (
"context"
"fmt"
"strconv"
"strings"
"time"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/intstr"
"sigs.k8s.io/controller-runtime/pkg/client"
mcsv1alpha1 "sigs.k8s.io/mcs-api/pkg/apis/v1alpha1"
api "github.com/percona/percona-server-mongodb-operator/pkg/apis/psmdb/v1"
)
// Service returns a core/v1 API Service
func Service(cr *api.PerconaServerMongoDB, replset *api.ReplsetSpec) *corev1.Service {
ls := map[string]string{
"app.kubernetes.io/name": "percona-server-mongodb",
"app.kubernetes.io/instance": cr.Name,
"app.kubernetes.io/replset": replset.Name,
"app.kubernetes.io/managed-by": "percona-server-mongodb-operator",
"app.kubernetes.io/part-of": "percona-server-mongodb",
}
svc := &corev1.Service{
TypeMeta: metav1.TypeMeta{
APIVersion: "v1",
Kind: "Service",
},
ObjectMeta: metav1.ObjectMeta{
Name: cr.Name + "-" + replset.Name,
Namespace: cr.Namespace,
Annotations: replset.Expose.ServiceAnnotations,
},
Spec: corev1.ServiceSpec{
Ports: []corev1.ServicePort{
{
Name: mongodPortName,
Port: api.DefaultMongodPort,
TargetPort: intstr.FromInt(int(api.DefaultMongodPort)),
},
},
ClusterIP: "None",
Selector: ls,
},
}
if cr.CompareVersion("1.12.0") >= 0 {
svc.Labels = make(map[string]string)
for k, v := range ls {
svc.Labels[k] = v
}
for k, v := range replset.Expose.ServiceLabels {
if _, ok := svc.Labels[k]; !ok {
svc.Labels[k] = v
}
}
}
return svc
}
// ExternalService returns a Service object needs to serve external connections
func ExternalService(cr *api.PerconaServerMongoDB, replset *api.ReplsetSpec, podName string) *corev1.Service {
svc := &corev1.Service{
TypeMeta: metav1.TypeMeta{
Kind: "Service",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: podName,
Namespace: cr.Namespace,
Annotations: replset.Expose.ServiceAnnotations,
},
}
svc.Labels = map[string]string{
"app.kubernetes.io/name": "percona-server-mongodb",
"app.kubernetes.io/instance": cr.Name,
"app.kubernetes.io/replset": replset.Name,
"app.kubernetes.io/managed-by": "percona-server-mongodb-operator",
"app.kubernetes.io/part-of": "percona-server-mongodb",
"app.kubernetes.io/component": "external-service",
}
for k, v := range replset.Expose.ServiceLabels {
if _, ok := svc.Labels[k]; !ok {
svc.Labels[k] = v
}
}
svc.Spec = corev1.ServiceSpec{
Ports: []corev1.ServicePort{
{
Name: mongodPortName,
Port: api.DefaultMongodPort,
TargetPort: intstr.FromInt(int(api.DefaultMongodPort)),
},
},
Selector: map[string]string{"statefulset.kubernetes.io/pod-name": podName},
}
switch replset.Expose.ExposeType {
case corev1.ServiceTypeNodePort:
svc.Spec.Type = corev1.ServiceTypeNodePort
svc.Spec.ExternalTrafficPolicy = "Local"
case corev1.ServiceTypeLoadBalancer:
svc.Spec.Type = corev1.ServiceTypeLoadBalancer
svc.Spec.ExternalTrafficPolicy = "Cluster"
svc.Spec.LoadBalancerSourceRanges = replset.Expose.LoadBalancerSourceRanges
default:
svc.Spec.Type = corev1.ServiceTypeClusterIP
}
return svc
}
type ServiceAddr struct {
Host string
Port int
}
func (s ServiceAddr) String() string {
return s.Host + ":" + strconv.Itoa(s.Port)
}
func GetServiceAddr(ctx context.Context, svc corev1.Service, pod corev1.Pod, cl client.Client) (*ServiceAddr, error) {
addr := &ServiceAddr{}
switch svc.Spec.Type {
case corev1.ServiceTypeClusterIP:
addr.Host = svc.Spec.ClusterIP
for _, p := range svc.Spec.Ports {
if p.Name != mongodPortName {
continue
}
addr.Port = int(p.Port)
}
case corev1.ServiceTypeLoadBalancer:
host, err := getIngressPoint(ctx, cl, types.NamespacedName{Name: pod.Name, Namespace: pod.Namespace})
if err != nil {
return nil, errors.Wrap(err, "get ingress endpoint")
}
addr.Host = host
for _, p := range svc.Spec.Ports {
if p.Name != mongodPortName {
continue
}
addr.Port = int(p.Port)
}
case corev1.ServiceTypeNodePort:
addr.Host = pod.Status.HostIP
for _, p := range svc.Spec.Ports {
if p.Name != mongodPortName {
continue
}
addr.Port = int(p.NodePort)
}
}
return addr, nil
}
var ErrNoIngressPoints = errors.New("ingress points not found")
func getIngressPoint(ctx context.Context, cl client.Client, serviceNN types.NamespacedName) (string, error) {
var retries uint64 = 0
var ip string
var hostname string
ticker := time.NewTicker(1 * time.Second)
defer ticker.Stop()
for range ticker.C {
retries++
if retries >= 1000 {
return "", ErrNoIngressPoints
}
svc := &corev1.Service{}
err := cl.Get(ctx, serviceNN, svc)
if err != nil {
return "", errors.Wrap(err, "failed to fetch service")
}
if len(svc.Status.LoadBalancer.Ingress) != 0 {
ip = svc.Status.LoadBalancer.Ingress[0].IP
hostname = svc.Status.LoadBalancer.Ingress[0].Hostname
}
if ip != "" {
return ip, nil
}
if hostname != "" {
return hostname, nil
}
}
return "", ErrNoIngressPoints
}
// GetReplsetAddrs returns a slice of replset host:port addresses
func GetReplsetAddrs(ctx context.Context, cl client.Client, cr *api.PerconaServerMongoDB, dnsMode api.DNSMode, rsName string, rsExposed bool, pods []corev1.Pod) ([]string, error) {
addrs := make([]string, 0)
for _, pod := range pods {
host, err := MongoHost(ctx, cl, cr, dnsMode, rsName, rsExposed, pod)
if err != nil {
return nil, errors.Wrapf(err, "failed to get external hostname for pod %s", pod.Name)
}
addrs = append(addrs, host)
}
return addrs, nil
}
// GetMongosAddrs returns a slice of mongos addresses
func GetMongosAddrs(ctx context.Context, cl client.Client, cr *api.PerconaServerMongoDB) ([]string, error) {
if !cr.Spec.Sharding.Mongos.Expose.ServicePerPod {
host, err := MongosHost(ctx, cl, cr, nil)
if err != nil {
return nil, errors.Wrap(err, "failed to get mongos host")
}
return []string{host}, nil
}
list, err := GetMongosPods(ctx, cl, cr)
if err != nil {
return nil, errors.Wrap(err, "failed to list mongos pods")
}
addrs := make([]string, 0, len(list.Items))
for _, pod := range list.Items {
host, err := MongosHost(ctx, cl, cr, &pod)
if err != nil {
return nil, errors.Wrap(err, "failed to get mongos host")
}
addrs = append(addrs, host)
}
return addrs, nil
}
// MongoHost returns the mongo host for given pod
func MongoHost(ctx context.Context, cl client.Client, cr *api.PerconaServerMongoDB, dnsMode api.DNSMode, rsName string, rsExposed bool, pod corev1.Pod) (string, error) {
switch dnsMode {
case api.DNSModeServiceMesh:
return GetServiceMeshAddr(cr, pod.Name, cr.Namespace), nil
case api.DNSModeInternal:
if rsExposed && cr.MCSEnabled() {
imported, err := IsServiceImported(ctx, cl, cr, pod.Name)
if err != nil {
return "", errors.Wrapf(err, "check if service imported for %s", pod.Name)
}
if !imported {
return GetAddr(cr, pod.Name, rsName), nil
}
return GetMCSAddr(cr, pod.Name), nil
}
return GetAddr(cr, pod.Name, rsName), nil
case api.DNSModeExternal:
if rsExposed {
if cr.MCSEnabled() {
imported, err := IsServiceImported(ctx, cl, cr, pod.Name)
if err != nil {
return "", errors.Wrapf(err, "check if service imported for %s", pod.Name)
}
if !imported {
return getExtAddr(ctx, cl, cr.Namespace, pod)
}
return GetMCSAddr(cr, pod.Name), nil
}
return getExtAddr(ctx, cl, cr.Namespace, pod)
}
return GetAddr(cr, pod.Name, rsName), nil
default:
return GetAddr(cr, pod.Name, rsName), nil
}
}
// MongosHost returns the mongos host for given pod
func MongosHost(ctx context.Context, cl client.Client, cr *api.PerconaServerMongoDB, pod *corev1.Pod) (string, error) {
svcName := cr.Name + "-mongos"
if cr.Spec.Sharding.Mongos.Expose.ServicePerPod {
svcName = pod.Name
}
nn := types.NamespacedName{
Namespace: cr.Namespace,
Name: svcName,
}
svc := new(corev1.Service)
err := cl.Get(ctx, nn, svc)
if err != nil {
if k8serrors.IsNotFound(err) {
return "", nil
}
return "", errors.Wrap(err, "failed to get mongos service")
}
mongos := cr.Spec.Sharding.Mongos
if mongos.Expose.ExposeType == corev1.ServiceTypeLoadBalancer && svc.Spec.Type == corev1.ServiceTypeLoadBalancer {
host, err := getIngressPoint(ctx, cl, nn)
if err != nil {
return "", errors.Wrap(err, "get ingress endpoint")
}
return host, nil
}
return svc.Name + "." + cr.Namespace + "." + cr.Spec.ClusterServiceDNSSuffix, nil
}
func getExtAddr(ctx context.Context, cl client.Client, namespace string, pod corev1.Pod) (string, error) {
svc, err := getExtServices(ctx, cl, namespace, pod.Name)
if err != nil {
return "", errors.Wrap(err, "fetch service address")
}
hostname, err := GetServiceAddr(ctx, *svc, pod, cl)
if err != nil {
return "", errors.Wrap(err, "get service hostname")
}
return hostname.String(), nil
}
// GetAddr returns replicaSet pod address in cluster
func GetAddr(cr *api.PerconaServerMongoDB, pod, replset string) string {
return strings.Join([]string{pod, cr.Name + "-" + replset, cr.Namespace, cr.Spec.ClusterServiceDNSSuffix}, ".") +
":" + strconv.Itoa(int(api.DefaultMongodPort))
}
// GetAddr returns replicaSet pod address in a service mesh
func GetServiceMeshAddr(cr *api.PerconaServerMongoDB, pod, replset string) string {
return strings.Join([]string{pod, cr.Namespace, cr.Spec.ClusterServiceDNSSuffix}, ".") +
":" + strconv.Itoa(int(api.DefaultMongodPort))
}
// GetMCSAddr returns ReplicaSet pod address using MultiCluster FQDN
func GetMCSAddr(cr *api.PerconaServerMongoDB, pod string) string {
return fmt.Sprintf("%s.%s.%s:%d", pod, cr.Namespace, cr.Spec.MultiCluster.DNSSuffix, api.DefaultMongodPort)
}
var ErrServiceNotExists = errors.New("service doesn't exist")
func getExtServices(ctx context.Context, cl client.Client, namespace, podName string) (*corev1.Service, error) {
svcMeta := &corev1.Service{}
for retries := 0; retries < 6; retries++ {
err := cl.Get(ctx, types.NamespacedName{Name: podName, Namespace: namespace}, svcMeta)
if err != nil {
if k8serrors.IsNotFound(err) {
time.Sleep(500 * time.Millisecond)
continue
}
return nil, errors.Wrap(err, "failed to fetch service")
}
return svcMeta, nil
}
return nil, ErrServiceNotExists
}
func IsServiceImported(ctx context.Context, k8sclient client.Client, cr *api.PerconaServerMongoDB, svcName string) (bool, error) {
si := new(mcsv1alpha1.ServiceImport)
err := k8sclient.Get(ctx, types.NamespacedName{
Namespace: cr.Namespace,
Name: svcName,
}, si)
if err != nil {
return false, client.IgnoreNotFound(err)
}
return true, nil
}