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service.go
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service.go
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package psmdb
import (
"context"
"fmt"
"strconv"
"strings"
"time"
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"
api "github.com/percona/percona-server-mongodb-operator/pkg/apis/psmdb/v1"
"github.com/pkg/errors"
)
// Service returns a core/v1 API Service
func Service(m *api.PerconaServerMongoDB, replset *api.ReplsetSpec) *corev1.Service {
ls := map[string]string{
"app.kubernetes.io/name": "percona-server-mongodb",
"app.kubernetes.io/instance": m.Name,
"app.kubernetes.io/replset": replset.Name,
"app.kubernetes.io/managed-by": "percona-server-mongodb-operator",
"app.kubernetes.io/part-of": "percona-server-mongodb",
}
return &corev1.Service{
TypeMeta: metav1.TypeMeta{
APIVersion: "v1",
Kind: "Service",
},
ObjectMeta: metav1.ObjectMeta{
Name: m.Name + "-" + replset.Name,
Namespace: m.Namespace,
},
Spec: corev1.ServiceSpec{
Ports: []corev1.ServicePort{
{
Name: mongodPortName,
Port: m.Spec.Mongod.Net.Port,
TargetPort: intstr.FromInt(int(m.Spec.Mongod.Net.Port)),
},
},
ClusterIP: "None",
Selector: ls,
},
}
}
// ExternalService returns a Service object needs to serve external connections
func ExternalService(m *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: m.Namespace,
},
}
svc.Labels = map[string]string{
"app.kubernetes.io/name": "percona-server-mongodb",
"app.kubernetes.io/instance": m.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",
}
svc.Spec = corev1.ServiceSpec{
Ports: []corev1.ServicePort{
{
Name: mongodPortName,
Port: m.Spec.Mongod.Net.Port,
TargetPort: intstr.FromInt(int(m.Spec.Mongod.Net.Port)),
},
},
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"
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(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(pod, cl)
if err != nil {
return nil, err
}
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
}
func getIngressPoint(pod corev1.Pod, cl client.Client) (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 "", fmt.Errorf("failed to fetch service. Retries limit reached")
}
svc := &corev1.Service{}
err := cl.Get(context.TODO(), types.NamespacedName{Name: pod.Name, Namespace: pod.Namespace}, svc)
if err != nil {
return "", fmt.Errorf("failed to fetch service: %v", err)
}
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 "", fmt.Errorf("can't get service %s ingress, retry limit reached", pod.Name)
}
// GetReplsetAddrs returns a slice of replset host:port addresses
func GetReplsetAddrs(cl client.Client, m *api.PerconaServerMongoDB, replset *api.ReplsetSpec, pods []corev1.Pod) ([]string, error) {
addrs := make([]string, 0)
for _, pod := range pods {
host, err := MongoHost(cl, m, replset, 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
}
// MongoHost returns the mongo host for given pod
func MongoHost(cl client.Client, m *api.PerconaServerMongoDB, replset *api.ReplsetSpec, pod corev1.Pod) (string, error) {
if replset.Expose.Enabled {
return getExtAddr(cl, m.Namespace, pod)
}
return getAddr(m, pod.Name, replset.Name), nil
}
func getExtAddr(cl client.Client, namespace string, pod corev1.Pod) (string, error) {
svc, err := getExtServices(cl, namespace, pod.Name)
if err != nil {
return "", fmt.Errorf("fetch service address: %v", err)
}
hostname, err := GetServiceAddr(*svc, pod, cl)
if err != nil {
return "", fmt.Errorf("get service hostname: %v", err)
}
return hostname.String(), nil
}
func getAddr(m *api.PerconaServerMongoDB, pod, replset string) string {
return strings.Join([]string{pod, m.Name + "-" + replset, m.Namespace, m.Spec.ClusterServiceDNSSuffix}, ".") +
":" + strconv.Itoa(int(m.Spec.Mongod.Net.Port))
}
func getExtServices(cl client.Client, namespace, podName string) (*corev1.Service, error) {
svcMeta := &corev1.Service{}
for retries := 0; retries < 6; retries++ {
err := cl.Get(context.TODO(), types.NamespacedName{Name: podName, Namespace: namespace}, svcMeta)
if err != nil {
if k8serrors.IsNotFound(err) {
time.Sleep(500 * time.Millisecond)
continue
}
return nil, fmt.Errorf("failed to fetch service: %v", err)
}
return svcMeta, nil
}
return nil, fmt.Errorf("failed to fetch service. Retries limit reached")
}