/
resource.go
255 lines (236 loc) · 8.47 KB
/
resource.go
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package general
import (
"encoding/json"
"fmt"
opt "github.com/alibaba/kt-connect/pkg/kt/command/options"
"github.com/alibaba/kt-connect/pkg/kt/service/cluster"
"github.com/alibaba/kt-connect/pkg/kt/transmission"
"github.com/alibaba/kt-connect/pkg/kt/util"
"github.com/rs/zerolog/log"
appV1 "k8s.io/api/apps/v1"
coreV1 "k8s.io/api/core/v1"
k8sErrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/util/intstr"
"strings"
"time"
)
func CreateShadowAndInbound(shadowPodName, portsToExpose string, labels, annotations map[string]string, portNameDict map[int]string) error {
envs := make(map[string]string)
_, podName, privateKeyPath, err := cluster.Ins().GetOrCreateShadow(shadowPodName, labels, annotations, envs, portsToExpose, portNameDict)
if err != nil {
return err
}
if _, err = transmission.ForwardPodToLocal(portsToExpose, podName, privateKeyPath); err != nil {
return err
}
return nil
}
func GetServiceByResourceName(resourceName, namespace string) (*coreV1.Service, error) {
resourceType, name, err := ParseResourceName(resourceName)
if err != nil {
return nil, err
}
switch resourceType {
case "deploy":
fallthrough
case "deployment":
app, err2 := cluster.Ins().GetDeployment(name, namespace)
if err2 != nil {
if k8sErrors.IsNotFound(err2) {
return nil, fmt.Errorf("deployment '%s' is not found in namespace %s", name, namespace)
}
return nil, err2
}
return getServiceByDeployment(app, namespace)
case "svc":
fallthrough
case "service":
svc, err2 := cluster.Ins().GetService(name, namespace)
if err2 != nil && k8sErrors.IsNotFound(err2) {
return nil, fmt.Errorf("service '%s' is not found in namespace %s", name, namespace)
}
return svc, err2
default:
return nil, fmt.Errorf("invalid resource type: %s", resourceType)
}
}
func GetDeploymentByResourceName(resourceName, namespace string) (*appV1.Deployment, error) {
resourceType, name, err := ParseResourceName(resourceName)
if err != nil {
return nil, err
}
switch resourceType {
case "deploy":
fallthrough
case "deployment":
app, err2 := cluster.Ins().GetDeployment(name, namespace)
if err2 != nil && k8sErrors.IsNotFound(err2) {
return nil, fmt.Errorf("deployment '%s' is not found in namespace %s", name, namespace)
}
return app, err2
case "svc":
fallthrough
case "service":
svc, err2 := cluster.Ins().GetService(name, namespace)
if err2 != nil {
if k8sErrors.IsNotFound(err2) {
return nil, fmt.Errorf("service '%s' is not found in namespace %s", name, namespace)
}
return nil, err2
}
return getDeploymentByService(svc, namespace)
default:
return nil, fmt.Errorf("invalid resource type: %s", resourceType)
}
}
func ParseResourceName(resourceName string) (string, string, error) {
segments := strings.Split(resourceName, "/")
var resourceType, name string
if len(segments) > 2 {
return "", "", fmt.Errorf("invalid resource name: %s", resourceName)
} else if len(segments) == 2 {
resourceType = segments[0]
name = segments[1]
} else {
resourceType = "service"
name = resourceName
}
return resourceType, name, nil
}
func UpdateServiceSelector(svcName, namespace string, selector map[string]string) error {
svc, err := cluster.Ins().GetService(svcName, namespace)
if err != nil {
return err
}
// if KtSelector annotation already exist, fetch current value
// otherwise you are the first exchange/mesh user to this service, record original selector
var marshaledSelector string
if svc.Annotations != nil && svc.Annotations[util.KtSelector] != "" {
marshaledSelector = svc.Annotations[util.KtSelector]
} else if svc.Spec.Selector[util.KtRole] != "" {
// service has no kt-selector annotation, but already point to a shadow or router pod
return fmt.Errorf("exchange or mesh service selecting kt pods is not allow")
} else {
rawSelector, err2 := json.Marshal(svc.Spec.Selector)
if err2 != nil {
log.Error().Err(err2).Msgf("Unable to record original pod selector of service %s", svc.Name)
return err2
}
marshaledSelector = string(rawSelector)
if svc.Annotations == nil || svc.Annotations[util.KtSelector] == "" {
svc.Annotations = util.MapPut(svc.Annotations, util.KtSelector, marshaledSelector)
}
}
if isServiceChanged(svc, selector, marshaledSelector) {
svc.Spec.Selector = selector
if _, err = cluster.Ins().UpdateService(svc); err != nil {
return err
}
}
go cluster.Ins().WatchService(svcName, namespace, nil, nil, func(newSvc *coreV1.Service) {
if pods, err2 := cluster.Ins().GetPodsByLabel(selector, namespace); err2 != nil || len(pods.Items) == 0 {
log.Warn().Msgf("Router pod has gone")
return
} else if pods.Items[0].DeletionTimestamp != nil {
log.Warn().Msgf("Router pod is terminating")
return
} else if len(pods.Items) > 1 {
log.Warn().Msgf("More than one router pod selected")
}
if !isServiceChanged(newSvc, selector, marshaledSelector) {
return
}
log.Debug().Msgf("Change in service %s detected", svcName)
// delay and double check to avoid multiple clients conflict
time.Sleep(util.RandomSeconds(1, 10))
if svc, err = cluster.Ins().GetService(svcName, namespace); err == nil {
if isServiceChanged(svc, selector, marshaledSelector) {
svc.Spec.Selector = selector
svc.Annotations = util.MapPut(svc.Annotations, util.KtSelector, marshaledSelector)
if _, err = cluster.Ins().UpdateService(svc); err != nil {
log.Error().Err(err).Msgf("Failed to recover service %s", svcName)
} else {
log.Info().Msgf("Service %s recovered", svcName)
}
}
}
})
return nil
}
func GetTargetPorts(svc *coreV1.Service) map[int]string {
var pod *coreV1.Pod = nil
svcPorts := svc.Spec.Ports
targetPorts := map[int]string{}
for _, p := range svcPorts {
if p.TargetPort.Type == intstr.Int {
targetPorts[p.TargetPort.IntValue()] = fmt.Sprintf("kt-%d", p.TargetPort.IntValue())
} else {
if pod == nil {
pods, err := cluster.Ins().GetPodsByLabel(svc.Spec.Selector, opt.Get().Global.Namespace)
if err != nil || len(pods.Items) == 0 {
return map[int]string{}
}
pod = &pods.Items[0]
}
for _, c := range pod.Spec.Containers {
for _, cp := range c.Ports {
if cp.Name == p.TargetPort.StrVal {
targetPorts[int(cp.ContainerPort)] = cp.Name
continue
}
}
}
}
}
return targetPorts
}
func isServiceChanged(svc *coreV1.Service, selector map[string]string, marshaledSelector string) bool {
return !util.MapEquals(svc.Spec.Selector, selector) || svc.Annotations == nil || svc.Annotations[util.KtSelector] != marshaledSelector
}
func getServiceByDeployment(app *appV1.Deployment, namespace string) (*coreV1.Service, error) {
svcList, err := cluster.Ins().GetServicesBySelector(app.Spec.Selector.MatchLabels, namespace)
if err != nil {
return nil, err
} else if len(svcList) == 0 {
return nil, fmt.Errorf("failed to find service for deployment '%s', with labels '%v'",
app.Name, app.Spec.Selector.MatchLabels)
} else if len(svcList) > 1 {
svcNames := svcList[0].Name
for i, svc := range svcList {
if i > 0 {
svcNames = svcNames + ", " + svc.Name
}
}
log.Warn().Msgf("Found %d services match deployment '%s': %s. First one will be used.",
len(svcList), app.Name, svcNames)
}
svc := svcList[0]
if strings.HasSuffix(svc.Name, util.StuntmanServiceSuffix) {
return cluster.Ins().GetService(strings.TrimSuffix(svc.Name, util.StuntmanServiceSuffix), namespace)
}
return &svc, nil
}
func getDeploymentByService(svc *coreV1.Service, namespace string) (*appV1.Deployment, error) {
apps, err := cluster.Ins().GetAllDeploymentInNamespace(namespace)
if err != nil {
return nil, err
}
for _, app := range apps.Items {
if util.MapContains(svc.Spec.Selector, app.Spec.Template.Labels) {
log.Info().Msgf("Using first matched deployment '%s'", app.Name)
return &app, nil
}
}
return nil, fmt.Errorf("failed to find deployment for service '%s', with selector '%v'", svc.Name, svc.Spec.Selector)
}
func GetOccupiedUser(labels map[string]string) string {
podList, err := cluster.Ins().GetPodsByLabel(labels, opt.Get().Global.Namespace)
if err == nil && len(podList.Items) > 0 && podList.Items[0].Annotations != nil && podList.Items[0].Annotations[util.KtUser] != "" {
return " (" + podList.Items[0].Annotations[util.KtUser] + ")"
}
appList, err := cluster.Ins().GetDeploymentsByLabel(labels, opt.Get().Global.Namespace)
if err == nil && len(appList.Items) > 0 && appList.Items[0].Annotations != nil && appList.Items[0].Annotations[util.KtUser] != "" {
return " (" + appList.Items[0].Annotations[util.KtUser] + ")"
}
return ""
}