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kubernetes_service.go
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kubernetes_service.go
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package kubernetes
import (
"fmt"
"sync"
"k8s.io/api/apps/v1beta1"
autoscalingV1 "k8s.io/api/autoscaling/v1"
"k8s.io/api/core/v1"
meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"github.com/kiali/kiali/config"
)
type servicesResponse struct {
services *v1.ServiceList
err error
}
type serviceSliceResponse struct {
services []v1.Service
err error
}
type serviceResponse struct {
service *v1.Service
err error
}
type endpointsResponse struct {
endpoints *v1.Endpoints
err error
}
type deploymentsResponse struct {
deployments *v1beta1.DeploymentList
err error
}
type autoscalersResponse struct {
autoscalers *autoscalingV1.HorizontalPodAutoscalerList
err error
}
type podsResponse struct {
pods *v1.PodList
err error
}
type podResponse struct {
pod *v1.Pod
err error
}
// GetNamespaces returns a list of all namespaces of the cluster.
// It returns a list of all namespaces of the cluster.
// It returns an error on any problem.
func (in *IstioClient) GetNamespaces() (*v1.NamespaceList, error) {
namespaces, err := in.k8s.CoreV1().Namespaces().List(emptyListOptions)
if err != nil {
return nil, err
}
return namespaces, nil
}
// GetFullServices returns a list of services for a given namespace, along with its pods and deployments.
// It returns an error on any problem.
func (in *IstioClient) GetFullServices(namespace string) (*ServiceList, error) {
var err error
servicesChan, podsChan, deploymentsChan := make(chan servicesResponse), make(chan podsResponse), make(chan deploymentsResponse)
go in.getServiceList(namespace, servicesChan)
go in.getPodsList(namespace, podsChan)
go in.getDeployments(namespace, deploymentsChan)
servicesResponse := <-servicesChan
podsResponse := <-podsChan
deploymentsResponse := <-deploymentsChan
services := &ServiceList{}
services.Services = servicesResponse.services
services.Pods = podsResponse.pods
services.Deployments = deploymentsResponse.deployments
if servicesResponse.err != nil {
err = servicesResponse.err
} else if podsResponse.err != nil {
err = podsResponse.err
} else {
err = deploymentsResponse.err
}
return services, err
}
// GetNamespaceAppsDetails returns a map of apps details (services, deployments and pods) in the given namespace.
// The map key is the app label.
// Entities without app label are gathered under empty-string-key
// It returns an error on any problem.
func (in *IstioClient) GetNamespaceAppsDetails(namespace string) (NamespaceApps, error) {
allEntities := make(NamespaceApps)
var err error
servicesChan, podsChan, deploymentsChan := make(chan servicesResponse), make(chan podsResponse), make(chan deploymentsResponse)
appLabel := config.Get().AppLabelName
go in.getServiceList(namespace, servicesChan)
go in.getPodsList(namespace, podsChan)
go in.getDeployments(namespace, deploymentsChan)
servicesResponse := <-servicesChan
podsResponse := <-podsChan
deploymentsResponse := <-deploymentsChan
for _, service := range servicesResponse.services.Items {
app := service.Labels[appLabel]
if appEntities, ok := allEntities[app]; ok {
appEntities.Services = append(appEntities.Services, service)
} else {
allEntities[app] = &AppDetails{
app: app,
Services: []v1.Service{service},
}
}
}
for _, pod := range podsResponse.pods.Items {
app := pod.Labels[appLabel]
if appEntities, ok := allEntities[app]; ok {
appEntities.Pods = append(appEntities.Pods, pod)
} else {
allEntities[app] = &AppDetails{
app: app,
Pods: []v1.Pod{pod},
}
}
}
for _, depl := range deploymentsResponse.deployments.Items {
app := depl.Labels[appLabel]
if appEntities, ok := allEntities[app]; ok {
appEntities.Deployments = append(appEntities.Deployments, depl)
} else {
allEntities[app] = &AppDetails{
app: app,
Deployments: []v1beta1.Deployment{depl},
}
}
}
if servicesResponse.err != nil {
err = servicesResponse.err
} else if podsResponse.err != nil {
err = podsResponse.err
} else {
err = deploymentsResponse.err
}
return allEntities, err
}
// GetAppDetails returns the app details (services, deployments and pods) for the input app label.
// It returns an error on any problem.
func (in *IstioClient) GetAppDetails(namespace, app string) (AppDetails, error) {
var errSvc, errPods, errDepls error
var wg sync.WaitGroup
var services *v1.ServiceList
var pods *v1.PodList
var depls *v1beta1.DeploymentList
appLabel := config.Get().AppLabelName
opts := meta_v1.ListOptions{LabelSelector: appLabel + "=" + app}
wg.Add(3)
go func() {
defer wg.Done()
services, errSvc = in.k8s.CoreV1().Services(namespace).List(opts)
}()
go func() {
defer wg.Done()
pods, errPods = in.k8s.CoreV1().Pods(namespace).List(opts)
}()
go func() {
defer wg.Done()
depls, errDepls = in.k8s.AppsV1beta1().Deployments(namespace).List(opts)
}()
wg.Wait()
details := AppDetails{
Services: []v1.Service{},
Pods: []v1.Pod{},
Deployments: []v1beta1.Deployment{},
}
if services != nil {
details.Services = services.Items
}
if pods != nil {
details.Pods = pods.Items
}
if depls != nil {
details.Deployments = depls.Items
}
if errSvc != nil {
return details, errSvc
} else if errPods != nil {
return details, errPods
}
return details, errDepls
}
// GetServices returns a list of services for a given namespace.
// It returns an error on any problem.
func (in *IstioClient) GetServices(namespace string) (*v1.ServiceList, error) {
return in.k8s.CoreV1().Services(namespace).List(emptyListOptions)
}
// GetDeployments returns a list of deployments for a given namespace.
// It returns an error on any problem.
func (in *IstioClient) GetDeployments(namespace string) (*v1beta1.DeploymentList, error) {
return in.k8s.AppsV1beta1().Deployments(namespace).List(emptyListOptions)
}
// GetService returns the definition of a specific service.
// It returns an error on any problem.
func (in *IstioClient) GetService(namespace, serviceName string) (*v1.Service, error) {
return in.k8s.CoreV1().Services(namespace).Get(serviceName, emptyGetOptions)
}
// GetDeployment returns the definition of a specific deployment.
// It returns an error on any problem.
func (in *IstioClient) GetDeployment(namespace, deploymentName string) (*v1beta1.Deployment, error) {
return in.k8s.AppsV1beta1().Deployments(namespace).Get(deploymentName, emptyGetOptions)
}
// GetDeploymentSelector returns the selector of a deployment.
// It returns an error on any problem.
// Return all labels listed as a human readable string separated by ','
func (in *IstioClient) GetDeploymentSelector(namespace, deploymentName string) (string, error) {
deployment, err := in.GetDeployment(namespace, deploymentName)
if err != nil {
return "", err
}
selector, err := meta_v1.LabelSelectorAsMap(deployment.Spec.Selector)
if err != nil {
return "", err
}
return labels.FormatLabels(selector), nil
}
// GetPods returns the pods definitions for a given set of labels.
// It returns an error on any problem.
func (in *IstioClient) GetPods(namespace, labelSelector string) (*v1.PodList, error) {
// An empty selector is ambiguous in the go client, could mean either "select all" or "select none"
// Here we assume empty == select all
// (see also https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#label-selectors)
return in.k8s.CoreV1().Pods(namespace).List(meta_v1.ListOptions{LabelSelector: labelSelector})
}
// GetNamespacePods returns the pods definitions for a given namespace
// It returns an error on any problem.
func (in *IstioClient) GetNamespacePods(namespace string) (*v1.PodList, error) {
return in.k8s.CoreV1().Pods(namespace).List(emptyListOptions)
}
// GetServiceDetails returns full details for a given service, consisting on service description, endpoints and pods.
// A service is defined by the namespace and the service name.
// It returns an error on any problem.
func (in *IstioClient) GetServiceDetails(namespace string, serviceName string) (*ServiceDetails, error) {
endpointsChan := make(chan endpointsResponse)
autoscalersChan := make(chan autoscalersResponse)
podsChan := make(chan podsResponse)
// Fetch the service first to ensure it exists, then fetch details in parallel
service, err := in.GetService(namespace, serviceName)
if err != nil {
return nil, fmt.Errorf("service: %s", err.Error())
}
go func() {
endpoints, err := in.k8s.CoreV1().Endpoints(namespace).Get(serviceName, emptyGetOptions)
endpointsChan <- endpointsResponse{endpoints: endpoints, err: err}
}()
go func() {
autoscalers, err := in.k8s.AutoscalingV1().HorizontalPodAutoscalers(namespace).List(emptyListOptions)
autoscalersChan <- autoscalersResponse{autoscalers: autoscalers, err: err}
}()
go func() {
pods, err := in.GetPods(namespace, labels.Set(service.Spec.Selector).String())
podsChan <- podsResponse{pods: pods, err: err}
}()
// Last fetch can be performed in main thread. This list is potentially too large and will be narrowed down below
deployments, err := in.k8s.AppsV1beta1().Deployments(namespace).List(emptyListOptions)
if err != nil {
return nil, fmt.Errorf("deployments: %s", err.Error())
}
serviceDetails := ServiceDetails{}
serviceDetails.Service = service
endpointsResponse := <-endpointsChan
if endpointsResponse.err != nil {
return nil, fmt.Errorf("endpoints: %s", endpointsResponse.err.Error())
}
serviceDetails.Endpoints = endpointsResponse.endpoints
autoscalersResponse := <-autoscalersChan
if autoscalersResponse.err != nil {
return nil, fmt.Errorf("autoscalers: %s", autoscalersResponse.err.Error())
}
serviceDetails.Autoscalers = autoscalersResponse.autoscalers
podsResponse := <-podsChan
if podsResponse.err != nil {
return nil, fmt.Errorf("pods: %s", podsResponse.err.Error())
}
serviceDetails.Pods = filterPodsForEndpoints(serviceDetails.Endpoints, podsResponse.pods)
// Finally, after we get the pods we can narrow down the deployments list
servicePods := FilterPodsForService(service, podsResponse.pods)
serviceDetails.Deployments = &v1beta1.DeploymentList{
Items: FilterDeploymentsForService(service, servicePods, deployments)}
return &serviceDetails, nil
}
func (in *IstioClient) GetDeploymentDetails(namespace string, deploymentName string) (*DeploymentDetails, error) {
podsChan, servicesChan := make(chan podsResponse), make(chan serviceSliceResponse)
deployment, err := in.GetDeployment(namespace, deploymentName)
if err != nil {
return nil, fmt.Errorf("deployment: %s", err.Error())
}
deploymentDetails := &DeploymentDetails{}
deploymentDetails.Deployment = deployment
deploymentSelector, err := meta_v1.LabelSelectorAsMap(deployment.Spec.Selector)
if err != nil {
return deploymentDetails, nil
}
go in.getPods(namespace, deploymentSelector, podsChan)
go in.getServicesByDeployment(namespace, deployment, servicesChan)
podsResponse := <-podsChan
if podsResponse.err != nil {
return nil, fmt.Errorf("pods: %s", podsResponse.err.Error())
}
deploymentDetails.Pods = podsResponse.pods
servicesResponse := <-servicesChan
if servicesResponse.err != nil {
return nil, fmt.Errorf("services: %s", servicesResponse.err.Error())
}
deploymentDetails.Services = servicesResponse.services
return deploymentDetails, nil
}
func filterAutoscalersByDeployments(deploymentNames []string, al *autoscalingV1.HorizontalPodAutoscalerList) *autoscalingV1.HorizontalPodAutoscalerList {
autoscalers := make([]autoscalingV1.HorizontalPodAutoscaler, 0, len(al.Items))
for _, autoscaler := range al.Items {
for _, deploymentName := range deploymentNames {
if deploymentName == autoscaler.Spec.ScaleTargetRef.Name {
autoscalers = append(autoscalers, autoscaler)
}
}
}
al.Items = autoscalers
return al
}
func getDeploymentNames(deployments *v1beta1.DeploymentList) []string {
deploymentNames := make([]string, len(deployments.Items))
for _, deployment := range deployments.Items {
deploymentNames = append(deploymentNames, deployment.Name)
}
return deploymentNames
}
func (in *IstioClient) getServiceList(namespace string, servicesChan chan servicesResponse) {
services, err := in.k8s.CoreV1().Services(namespace).List(emptyListOptions)
servicesChan <- servicesResponse{services: services, err: err}
}
func (in *IstioClient) getPodsList(namespace string, podsChan chan podsResponse) {
pods, err := in.GetNamespacePods(namespace)
podsChan <- podsResponse{pods: pods, err: err}
}
func (in *IstioClient) getDeployments(namespace string, deploymentsChan chan deploymentsResponse) {
deployments, err := in.k8s.AppsV1beta1().Deployments(namespace).List(emptyListOptions)
deploymentsChan <- deploymentsResponse{deployments: deployments, err: err}
}
func (in *IstioClient) getPods(namespace string, selector map[string]string, podsChan chan podsResponse) {
selectorQuery := labels.Set(selector).String()
pods, err := in.GetPods(namespace, selectorQuery)
podsChan <- podsResponse{pods: pods, err: err}
}
func (in *IstioClient) getServicesByDeployment(namespace string, deployment *v1beta1.Deployment,
serviceChan chan serviceSliceResponse) {
var err error
var allServices *v1.ServiceList
var services []v1.Service
allServices, err = in.k8s.CoreV1().Services(namespace).List(emptyListOptions)
for _, svc := range allServices.Items {
svcSelector := labels.Set(svc.Spec.Selector).AsSelector()
if svcSelector.Matches(labels.Set(deployment.Labels)) {
services = append(services, svc)
}
}
serviceChan <- serviceSliceResponse{services: services, err: err}
}