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k8s_service.go
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k8s_service.go
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package k8s
import (
"context"
"fmt"
"net"
"time"
"github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
)
func (c *Client) GetService(ctx context.Context, name string) (*v1.Service, error) {
svc, err := c.clientset.CoreV1().Services(c.namespace).Get(ctx, name, metav1.GetOptions{})
if err != nil {
return nil, ErrGettingService.WithParams(name).Wrap(err)
}
return svc, nil
}
func (c *Client) CreateService(
ctx context.Context,
name string,
labels,
selectorMap map[string]string,
portsTCP,
portsUDP []int,
) (*v1.Service, error) {
svc, err := prepareService(c.namespace, name, labels, selectorMap, portsTCP, portsUDP)
if err != nil {
return nil, ErrPreparingService.WithParams(name).Wrap(err)
}
serv, err := c.clientset.CoreV1().Services(c.namespace).Create(ctx, svc, metav1.CreateOptions{})
if err != nil {
return nil, ErrCreatingService.WithParams(name).Wrap(err)
}
logrus.Debugf("Service %s created in namespace %s", name, c.namespace)
return serv, nil
}
func (c *Client) PatchService(
ctx context.Context,
name string,
labels,
selectorMap map[string]string,
portsTCP,
portsUDP []int,
) (*v1.Service, error) {
svc, err := prepareService(c.namespace, name, labels, selectorMap, portsTCP, portsUDP)
if err != nil {
return nil, ErrPreparingService.WithParams(name).Wrap(err)
}
serv, err := c.clientset.CoreV1().Services(c.namespace).Update(ctx, svc, metav1.UpdateOptions{})
if err != nil {
return nil, ErrPatchingService.WithParams(name).Wrap(err)
}
logrus.Debugf("Service %s patched in namespace %s", name, c.namespace)
return serv, nil
}
func (c *Client) DeleteService(ctx context.Context, name string) error {
_, err := c.GetService(ctx, name)
if err != nil {
return ErrGettingService.WithParams(name).Wrap(err)
}
err = c.clientset.CoreV1().Services(c.namespace).Delete(ctx, name, metav1.DeleteOptions{})
if err != nil {
return ErrDeletingService.WithParams(name).Wrap(err)
}
logrus.Debugf("Service %s deleted in namespace %s", name, c.namespace)
return nil
}
func (c *Client) GetServiceIP(ctx context.Context, name string) (string, error) {
svc, err := c.GetService(ctx, name)
if err != nil {
return "", ErrGettingService.WithParams(name).Wrap(err)
}
return svc.Spec.ClusterIP, nil
}
func buildPorts(tcpPorts, udpPorts []int) []v1.ServicePort {
ports := make([]v1.ServicePort, 0, len(tcpPorts)+len(udpPorts))
for _, port := range tcpPorts {
ports = append(ports, v1.ServicePort{
Name: fmt.Sprintf("tcp-%d", port),
Protocol: v1.ProtocolTCP,
Port: int32(port),
TargetPort: intstr.FromInt(port),
})
}
for _, port := range udpPorts {
ports = append(ports, v1.ServicePort{
Name: fmt.Sprintf("udp-%d", port),
Protocol: v1.ProtocolUDP,
Port: int32(port),
TargetPort: intstr.FromInt(port),
})
}
return ports
}
func prepareService(
namespace, name string,
labels, selectorMap map[string]string,
tcpPorts, udpPorts []int,
) (*v1.Service, error) {
if namespace == "" {
return nil, ErrNamespaceRequired
}
if name == "" {
return nil, ErrServiceNameRequired
}
if labels == nil {
labels = make(map[string]string)
}
if selectorMap == nil {
selectorMap = make(map[string]string)
}
servicePorts := buildPorts(tcpPorts, udpPorts)
if len(servicePorts) == 0 {
return nil, ErrNoPortsSpecified.WithParams(name)
}
svc := &v1.Service{
ObjectMeta: metav1.ObjectMeta{
Namespace: namespace,
Name: name,
Labels: labels,
},
Spec: v1.ServiceSpec{
Ports: servicePorts,
Selector: selectorMap,
Type: v1.ServiceTypeClusterIP,
},
}
return svc, nil
}
func (c *Client) WaitForService(ctx context.Context, name string) error {
ticker := time.NewTicker(waitRetry)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return ErrTimeoutWaitingForServiceReady
case <-ticker.C:
ready, err := c.isServiceReady(ctx, name)
if err != nil {
return ErrCheckingServiceReady.WithParams(name).Wrap(err)
}
if !ready {
continue
}
// Check if service is reachable
endpoint, err := c.GetServiceEndpoint(ctx, name)
if err != nil {
return ErrGettingServiceEndpoint.WithParams(name).Wrap(err)
}
if err := checkServiceConnectivity(endpoint); err != nil {
continue
}
// Service is reachable
return nil
}
}
}
func (c *Client) GetServiceEndpoint(ctx context.Context, name string) (string, error) {
srv, err := c.clientset.CoreV1().Services(c.namespace).Get(ctx, name, metav1.GetOptions{})
if err != nil {
return "", ErrGettingService.WithParams(name).Wrap(err)
}
if srv.Spec.Type == v1.ServiceTypeLoadBalancer {
// Use the LoadBalancer's external IP
if len(srv.Status.LoadBalancer.Ingress) > 0 {
return fmt.Sprintf("%s:%d", srv.Status.LoadBalancer.Ingress[0].IP, srv.Spec.Ports[0].Port), nil
}
return "", ErrLoadBalancerIPNotAvailable
}
if srv.Spec.Type == v1.ServiceTypeNodePort {
// Use the Node IP and NodePort
nodes, err := c.clientset.CoreV1().Nodes().List(ctx, metav1.ListOptions{})
if err != nil {
return "", ErrGettingNodes.Wrap(err)
}
if len(nodes.Items) == 0 {
return "", ErrNoNodesFound
}
// Use the first node for simplicity, you might need to handle multiple nodes
var nodeIP string
for _, address := range nodes.Items[0].Status.Addresses {
if address.Type == "ExternalIP" {
nodeIP = address.Address
break
}
}
return fmt.Sprintf("%s:%d", nodeIP, srv.Spec.Ports[0].NodePort), nil
}
return fmt.Sprintf("%s:%d", srv.Spec.ClusterIP, srv.Spec.Ports[0].Port), nil
}
func checkServiceConnectivity(serviceEndpoint string) error {
conn, err := net.DialTimeout("tcp", serviceEndpoint, waitRetry)
if err != nil {
return ErrFailedToConnect.WithParams(serviceEndpoint).Wrap(err)
}
defer conn.Close()
return nil // success
}
func (c *Client) isServiceReady(ctx context.Context, name string) (bool, error) {
service, err := c.GetService(ctx, name)
if err != nil {
return false, ErrGettingService.WithParams(name).Wrap(err)
}
switch service.Spec.Type {
case v1.ServiceTypeLoadBalancer:
return len(service.Status.LoadBalancer.Ingress) > 0, nil
case v1.ServiceTypeNodePort:
return service.Spec.Ports[0].NodePort != 0, nil
default:
return len(service.Spec.ExternalIPs) > 0, nil
}
}