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k3s.go
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k3s.go
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// Package k3s provides functionality to provision a K3S edge cluster type and manage them
package k3s
import (
"bytes"
"context"
"crypto/sha256"
"fmt"
"net/http"
"strings"
"sync"
"time"
"github.com/decentralized-cloud/edge-cluster/models"
"github.com/decentralized-cloud/edge-cluster/services/configuration"
"github.com/decentralized-cloud/edge-cluster/services/edgecluster/helm"
"github.com/decentralized-cloud/edge-cluster/services/edgecluster/types"
commonErrors "github.com/micro-business/go-core/system/errors"
"go.uber.org/zap"
appsv1 "k8s.io/api/apps/v1"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/client-go/kubernetes"
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp" // register GCP auth provider
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/tools/remotecommand"
"k8s.io/client-go/util/retry"
)
const (
containerName = "k3sserver"
k3sPort = 6443
internalName = "k3s"
kubeconfigFilePath = "/etc/rancher/k3s/k3s.yaml"
)
var deploymentReplica int32 = 1
var waitForDeploymentToBeReadyTimeout int64 = 120
type k3sProvisioner struct {
logger *zap.Logger
clientset *kubernetes.Clientset
k8sRestConfig *rest.Config
k3sDockerImage string
helmService helm.HelmHelperContract
}
// NewK3SProvisioner creates new instance of the k3sProvisioner, setting up all dependencies and returns the instance
// logger: Mandatory. Reference to the logger service
// k8sRestConfig: Mandatory. Reference to the Rest config points to the running K8S cluster
// Returns the new service or error if something goes wrong
func NewK3SProvisioner(
logger *zap.Logger,
k8sRestConfig *rest.Config,
configurationService configuration.ConfigurationContract,
helmService helm.HelmHelperContract) (types.EdgeClusterProvisionerContract, error) {
if logger == nil {
return nil, commonErrors.NewArgumentNilError("logger", "logger is required")
}
if k8sRestConfig == nil {
return nil, commonErrors.NewArgumentNilError("k8sRestConfig", "k8sRestConfig is required")
}
if configurationService == nil {
return nil, commonErrors.NewArgumentNilError("configurationService", "configurationService is required")
}
if helmService == nil {
return nil, commonErrors.NewArgumentNilError("helmService", "helmService is required")
}
k3sDockerImage, err := configurationService.GetK3SDockerImage()
if err != nil {
return nil, types.NewUnknownErrorWithError("failed to get the database name", err)
}
var clientset *kubernetes.Clientset
if clientset, err = kubernetes.NewForConfig(k8sRestConfig); err != nil {
return nil, types.NewUnknownErrorWithError("failed to create client set", err)
}
return &k3sProvisioner{
logger: logger,
clientset: clientset,
k8sRestConfig: k8sRestConfig,
k3sDockerImage: k3sDockerImage,
helmService: helmService,
}, nil
}
// CreateProvision provisions a new edge cluster.
// ctx: Mandatory The reference to the context
// request: Mandatory. The request to provision a new edge cluster
// Returns either the result of provisioning new edge cluster or error if something goes wrong.
func (service *k3sProvisioner) CreateProvision(
ctx context.Context,
request *types.CreateProvisionRequest) (response *types.CreateProvisionResponse, err error) {
namespace := getNamespace(request.EdgeClusterID)
if err = service.createProvisionNameSpace(ctx, namespace); err != nil {
return
}
if err = service.createService(ctx, namespace); err != nil {
_, _ = service.DeleteProvision(ctx, &types.DeleteProvisionRequest{EdgeClusterID: request.EdgeClusterID})
return
}
if err = service.createDeployment(
ctx,
namespace,
request.ClusterSecret); err != nil {
_, _ = service.DeleteProvision(ctx, &types.DeleteProvisionRequest{EdgeClusterID: request.EdgeClusterID})
return
}
response = &types.CreateProvisionResponse{}
isReady, err := service.isK3SPodReady(ctx, request.EdgeClusterID)
if err != nil {
service.logger.Error("K3S pod status is not ready", zap.Error(err))
return
}
if !isReady {
service.logger.Error("K3S pod status is not ready")
return
}
if err = service.deployHelmChart(ctx, request.EdgeClusterID); err != nil {
service.logger.Error("failed to install the helm charts", zap.Error(err))
return
}
return
}
// UpdateProvisionWithRetry updates an existing provision.
// ctx: Mandatory The reference to the context
// request: Mandatory. The request to update an existing provision
// Returns either the result of updating an existing provision or error if something goes wrong.
func (service *k3sProvisioner) UpdateProvisionWithRetry(
ctx context.Context,
request *types.UpdateProvisionRequest) (response *types.UpdateProvisionResponse, err error) {
namespace := getNamespace(request.EdgeClusterID)
err = retry.RetryOnConflict(
retry.DefaultRetry,
func() (err error) {
client := service.clientset.AppsV1().Deployments(namespace)
deployment, err := client.Get(ctx, internalName, metav1.GetOptions{})
if err != nil {
service.logger.Error("failed to update the edge cluster", zap.Error(err))
return
}
deployment.Spec.Template.Spec, err = service.getDeploymentSpec(ctx, namespace, request.ClusterSecret)
if err != nil {
return err
}
if _, err = client.Update(ctx, deployment, metav1.UpdateOptions{}); err != nil {
service.logger.Error("failed to update the edge custer", zap.Error(err))
return
}
return
})
response = &types.UpdateProvisionResponse{}
isReady, internalErr := service.isK3SPodReady(ctx, request.EdgeClusterID)
if internalErr != nil {
service.logger.Error("K3S pod status is not ready", zap.Error(internalErr))
return
}
if !isReady {
service.logger.Error("K3S pod status is not ready")
return
}
if internalErr = service.deployHelmChart(ctx, request.EdgeClusterID); internalErr != nil {
service.logger.Error("failed to install the helm charts", zap.Error(internalErr))
return
}
return
}
// DeleteProvision deletes an existing provision.
// ctx: Mandatory The reference to the context
// request: Mandatory. The request to delete an existing provision
// Returns either the result of deleting an existing provision or error if something goes wrong.
func (service *k3sProvisioner) DeleteProvision(
ctx context.Context,
request *types.DeleteProvisionRequest) (response *types.DeleteProvisionResponse, err error) {
namespace := getNamespace(request.EdgeClusterID)
deletePolicy := metav1.DeletePropagationForeground
if err = service.clientset.CoreV1().Namespaces().Delete(
ctx,
namespace,
metav1.DeleteOptions{
PropagationPolicy: &deletePolicy,
}); err != nil {
service.logger.Error("failed to delete namespace", zap.Error(err))
return
}
response = &types.DeleteProvisionResponse{}
return
}
// GetProvisionDetails retrieves information on an existing provision.
// ctx: Mandatory The reference to the context
// request: Mandatory. The request to retrieve information on an existing provision
// Returns either the result of retrieving information on an provision or error if something goes wrong.
func (service *k3sProvisioner) GetProvisionDetails(
ctx context.Context,
request *types.GetProvisionDetailsRequest) (response *types.GetProvisionDetailsResponse, err error) {
namespace := getNamespace(request.EdgeClusterID)
serviceDetails, err := service.getProvvisionedServiceDetails(ctx, namespace)
if err != nil {
service.logger.Error("failed to get service details", zap.Error(err))
return
}
kubeconfigContent, err := service.getProvisionDetailsKubeConfigContent(ctx, namespace)
if err != nil {
service.logger.Error("failed to get kubeconfig content", zap.Error(err))
return
}
for _, item := range serviceDetails.Status.LoadBalancer.Ingress {
if item.IP != "" {
kubeconfigContent = strings.Replace(kubeconfigContent, "127.0.0.1", item.IP, -1)
} else if item.Hostname != "" {
kubeconfigContent = strings.Replace(kubeconfigContent, "127.0.0.1", item.Hostname, -1)
} else {
kubeconfigContent = strings.Replace(kubeconfigContent, "127.0.0.1", "BLANK", -1)
}
}
for _, item := range serviceDetails.Spec.Ports {
kubeconfigContent = strings.Replace(kubeconfigContent, fmt.Sprintf("%d", k3sPort), fmt.Sprintf("%d", item.Port), -1)
}
response = &types.GetProvisionDetailsResponse{
ProvisionDetails: models.ProvisionDetails{
Service: serviceDetails,
KubeconfigContent: kubeconfigContent,
}}
return
}
// ListNodes lists an existing edge cluster nodes details
// ctx: Mandatory The reference to the context
// request: Mandatory. The request to list an existing edge cluster nodes details
// Returns an existing edge cluster nodes details or error if something goes wrong.
func (service *k3sProvisioner) ListNodes(
ctx context.Context,
request *types.ListNodesRequest) (response *types.ListNodesResponse, err error) {
clientset, err := service.createClientsetForEdgeCluster(ctx, request.EdgeClusterID)
if err != nil {
return nil, err
}
var nodeList *v1.NodeList
if nodeList, err = clientset.CoreV1().Nodes().List(ctx, metav1.ListOptions{}); err != nil {
return nil, types.NewUnknownErrorWithError("failed to retreive node list", err)
}
response = &types.ListNodesResponse{Nodes: []models.EdgeClusterNode{}}
for _, node := range nodeList.Items {
response.Nodes = append(response.Nodes, models.EdgeClusterNode{
Node: node,
})
}
return
}
// ListPods lists an existing edge cluster pods that matchs the given search criteria
// ctx: Mandatory The reference to the context
// request: Mandatory. The request that contains the search criteria to filter the pods
// Returns the list of running pods that matchs the given search criteria or error if something goes wrong.
func (service *k3sProvisioner) ListPods(
ctx context.Context,
request *types.ListPodsRequest) (response *types.ListPodsResponse, err error) {
clientset, err := service.createClientsetForEdgeCluster(ctx, request.EdgeClusterID)
if err != nil {
return nil, err
}
var pods *v1.PodList
if pods, err = clientset.CoreV1().Pods(request.Namespace).List(ctx, metav1.ListOptions{}); err != nil {
return nil, types.NewUnknownErrorWithError("failed to retreive pod list", err)
}
response = &types.ListPodsResponse{Pods: []models.EdgeClusterPod{}}
for _, pod := range pods.Items {
response.Pods = append(response.Pods, models.EdgeClusterPod{
Pod: pod,
})
}
return
}
// ListServices lists an existing edge cluster services that matchs the given search criteria
// ctx: Mandatory The reference to the context
// request: Mandatory. The request that contains the search criteria to filter the services
// Returns the list of services that matches the given search criteria or error if something goes wrong.
func (service *k3sProvisioner) ListServices(
ctx context.Context,
request *types.ListServicesRequest) (response *types.ListServicesResponse, err error) {
clientset, err := service.createClientsetForEdgeCluster(ctx, request.EdgeClusterID)
if err != nil {
return nil, err
}
var services *v1.ServiceList
if services, err = clientset.CoreV1().Services(request.Namespace).List(ctx, metav1.ListOptions{}); err != nil {
return nil, types.NewUnknownErrorWithError("failed to retreive service list", err)
}
response = &types.ListServicesResponse{Services: []models.EdgeClusterService{}}
for _, service := range services.Items {
response.Services = append(response.Services, models.EdgeClusterService{
Service: service,
})
}
return
}
func (service *k3sProvisioner) createProvisionNameSpace(ctx context.Context, namespace string) (err error) {
ns, err := service.clientset.CoreV1().Namespaces().Get(ctx, namespace, metav1.GetOptions{})
if err != nil && strings.Contains(err.Error(), "not found") {
namespaceConfig := &v1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: namespace,
},
}
if _, err = service.clientset.CoreV1().Namespaces().Create(ctx, namespaceConfig, metav1.CreateOptions{}); err != nil {
service.logger.Error(
"failed to create namespace",
zap.Error(err),
zap.String("namespace", namespace))
return
}
} else if err != nil {
service.logger.Error("failed to validate the requested namespace", zap.Error(err), zap.String("namespace", namespace))
return
}
if ns != nil && ns.GetName() == namespace {
service.logger.Info("namespace already exists", zap.String("namespace", namespace))
return
}
return
}
func (service *k3sProvisioner) createDeployment(
ctx context.Context,
namespace string,
k3SClusterSecret string) (err error) {
spec, err := service.getDeploymentSpec(ctx, namespace, k3SClusterSecret)
if err != nil {
return err
}
client := service.clientset.AppsV1().Deployments(namespace)
deploymentConfig := &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: internalName,
Namespace: namespace,
},
Spec: appsv1.DeploymentSpec{
Replicas: &deploymentReplica,
Selector: &metav1.LabelSelector{
MatchLabels: map[string]string{
internalName: internalName,
},
},
Template: v1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Labels: map[string]string{
internalName: internalName,
},
},
Spec: spec,
},
},
}
if _, err := client.Create(ctx, deploymentConfig, metav1.CreateOptions{}); err != nil {
service.logger.Error("failed to create edge cluster", zap.Error(err), zap.Any("Config", deploymentConfig))
}
return
}
func (service *k3sProvisioner) createService(ctx context.Context, namespace string) (err error) {
serviceDeployment := service.clientset.CoreV1().Services(namespace)
servicePorts := []v1.ServicePort{
{
Name: internalName,
Protocol: v1.ProtocolTCP,
Port: k3sPort,
TargetPort: intstr.FromInt(k3sPort),
},
}
serviceSelector := map[string]string{
internalName: internalName,
}
serviceConfig := &v1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: internalName,
Namespace: namespace,
Labels: map[string]string{
"k8s-app": internalName,
},
},
Spec: v1.ServiceSpec{
Ports: servicePorts,
Selector: serviceSelector,
Type: v1.ServiceTypeLoadBalancer,
},
}
if _, err = serviceDeployment.Create(ctx, serviceConfig, metav1.CreateOptions{}); err != nil {
service.logger.Error("failed to create service", zap.Error(err), zap.Any("Config", serviceConfig))
return
}
return
}
func getNamespace(edgeClusterID string) string {
return fmt.Sprintf("%x", sha256.Sum224([]byte(edgeClusterID)))
}
func (service *k3sProvisioner) getDeploymentSpec(ctx context.Context, namespace string, k3SClusterSecret string) (v1.PodSpec, error) {
advertiseAddress, err := service.getAdvertiseAddress(ctx, namespace)
if err != nil {
return v1.PodSpec{}, err
}
return v1.PodSpec{
Containers: []v1.Container{
{
Name: containerName,
Image: service.k3sDockerImage,
Args: []string{
"server",
fmt.Sprintf("--advertise-address=%s", advertiseAddress),
},
Env: []v1.EnvVar{
{Name: "K3S_CLUSTER_SECRET", Value: k3SClusterSecret},
},
Ports: []v1.ContainerPort{
{
Name: internalName,
ContainerPort: k3sPort,
},
},
},
},
}, nil
}
func (service *k3sProvisioner) getProvvisionedServiceDetails(
ctx context.Context,
namespace string) (*v1.Service, error) {
var serviceInfo *v1.Service
var err error
if serviceInfo, err = service.clientset.CoreV1().Services(namespace).Get(ctx, internalName, metav1.GetOptions{}); err != nil {
service.logger.Error("failed to fetch service info", zap.Error(err))
return nil, err
}
return serviceInfo, nil
}
func (service *k3sProvisioner) getProvisionDetailsKubeConfigContent(
ctx context.Context,
namespace string) (kubeconfigContent string, err error) {
pods, err := service.clientset.CoreV1().Pods(namespace).List(ctx, metav1.ListOptions{})
if err != nil {
return
}
if len(pods.Items) <= 0 {
return "", types.NewUnknownError("Pod is not ready yet")
}
execRequest := service.clientset.CoreV1().RESTClient().
Post().
Resource("pods").
Name(pods.Items[0].ObjectMeta.Name).
Namespace(pods.Items[0].ObjectMeta.Namespace).
SubResource("exec").
Param("stdout", "true").
Param("command", "cat").
Param("command", kubeconfigFilePath)
executor, err := remotecommand.NewSPDYExecutor(service.k8sRestConfig, http.MethodPost, execRequest.URL())
if err != nil {
err = types.NewUnknownErrorWithError("failed to retrieve KubeConfig content.", err)
return
}
output := &bytes.Buffer{}
if err = executor.Stream(remotecommand.StreamOptions{Stdout: output}); err != nil {
err = types.NewUnknownErrorWithError("failed to retrieve KubeConfig content", err)
return
}
kubeconfigContent = output.String()
return
}
func (service *k3sProvisioner) getAdvertiseAddress(
ctx context.Context,
namespace string) (string, error) {
watch, err := service.clientset.CoreV1().Services(namespace).Watch(ctx, metav1.ListOptions{
Watch: true,
TimeoutSeconds: &waitForDeploymentToBeReadyTimeout,
})
if err != nil {
service.logger.Error("failed to retrieve advertise address", zap.Error(err))
return "", err
}
for event := range watch.ResultChan() {
if service, ok := event.Object.(*v1.Service); ok {
for _, item := range service.Status.LoadBalancer.Ingress {
if item.IP != "" {
watch.Stop()
return item.IP, nil
} else if item.Hostname != "" {
watch.Stop()
return item.Hostname, nil
}
}
}
}
return "", types.NewUnknownError("failed to retrieve advertise address")
}
func (service *k3sProvisioner) createClientsetForEdgeCluster(
ctx context.Context,
edgeClusterID string) (clientset *kubernetes.Clientset, err error) {
getProvisionDetailsResponse, err := service.GetProvisionDetails(
ctx,
&types.GetProvisionDetailsRequest{
EdgeClusterID: edgeClusterID,
})
if err != nil {
return
}
var restConfig *rest.Config
if restConfig, err = clientcmd.RESTConfigFromKubeConfig(
[]byte(getProvisionDetailsResponse.ProvisionDetails.KubeconfigContent)); err != nil {
service.logger.Error("failed to create Rest config from the given kube config", zap.Error(err))
return
}
if clientset, err = kubernetes.NewForConfig(restConfig); err != nil {
service.logger.Error("failed to create client set", zap.Error(err))
return
}
return
}
func (service *k3sProvisioner) isK3SPodReady(
ctx context.Context,
edgeClusterID string) (bool, error) {
namespace := getNamespace(edgeClusterID)
watch, err := service.clientset.CoreV1().Pods(namespace).Watch(ctx, metav1.ListOptions{
Watch: true,
TimeoutSeconds: &waitForDeploymentToBeReadyTimeout,
})
if err != nil {
service.logger.Error("failed to retrieve K3S pod status", zap.Error(err))
return false, err
}
for event := range watch.ResultChan() {
if pod, ok := event.Object.(*v1.Pod); ok {
for _, item := range pod.Status.Conditions {
if item.Type == v1.ContainersReady {
watch.Stop()
for i := 0; i < 60; i++ {
if _, err := service.GetProvisionDetails(ctx, &types.GetProvisionDetailsRequest{EdgeClusterID: edgeClusterID}); err == nil {
return true, nil
}
time.Sleep(1 * time.Second)
}
return false, nil
}
}
}
}
return false, types.NewUnknownError("failed to retrieve K3S pod status")
}
func (service *k3sProvisioner) deployHelmChart(ctx context.Context, edgeClusterID string) error {
provisionDetails, err := service.GetProvisionDetails(ctx, &types.GetProvisionDetailsRequest{EdgeClusterID: edgeClusterID})
if err != nil {
return err
}
errorsChan := make(chan error)
waitGroupDoneChan := make(chan bool)
var waitGroup sync.WaitGroup
waitGroup.Add(2)
go func() {
defer waitGroup.Done()
if err := service.helmService.InstallChart(
provisionDetails.ProvisionDetails.KubeconfigContent,
"portainer",
"portainer",
"portainer",
"portainer",
map[string]string{
"set": "service.type=LoadBalancer",
}); err != nil {
errorsChan <- err
}
}()
go func() {
defer waitGroup.Done()
if err := service.helmService.InstallChart(
provisionDetails.ProvisionDetails.KubeconfigContent,
"edgecluster",
"edge-core",
"decentralized-cloud",
"edge-core",
map[string]string{
"set": "pod.edgeClusterType=K3S",
}); err != nil {
errorsChan <- err
}
}()
go func() {
waitGroup.Wait()
close(waitGroupDoneChan)
}()
select {
case <-waitGroupDoneChan:
close(errorsChan)
return nil
case err := <-errorsChan:
close(errorsChan)
return err
}
}