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cluster_generator.go
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cluster_generator.go
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package generator
import (
"bytes"
"context"
"encoding/base64"
"errors"
"log"
"strings"
"time"
v12 "k8s.io/apimachinery/pkg/apis/meta/v1"
"github.com/argoproj/argo-cd/v2/util/helm"
"gopkg.in/yaml.v2"
"k8s.io/client-go/kubernetes/scheme"
v1 "k8s.io/api/core/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/remotecommand"
"k8s.io/client-go/kubernetes"
"github.com/argoproj/argo-cd/v2/hack/gen-resources/util"
argoappv1 "github.com/argoproj/argo-cd/v2/pkg/apis/application/v1alpha1"
"github.com/argoproj/argo-cd/v2/util/db"
)
const POD_PREFIX = "vcluster"
type Cluster struct {
Server string `yaml:"server"`
CertificateAuthorityData string `yaml:"certificate-authority-data,omitempty"`
}
type AuthInfo struct {
ClientCertificateData string `yaml:"client-certificate-data,omitempty"`
ClientKeyData string `yaml:"client-key-data,omitempty"`
}
type NamedCluster struct {
// Name is the nickname for this Cluster
Name string `yaml:"name"`
// Cluster holds the cluster information
Cluster Cluster `yaml:"cluster"`
}
type NamedAuthInfo struct {
// Name is the nickname for this AuthInfo
Name string `yaml:"name"`
// AuthInfo holds the auth information
AuthInfo AuthInfo `yaml:"user"`
}
type Config struct {
Clusters []NamedCluster `yaml:"clusters"`
AuthInfos []NamedAuthInfo `yaml:"users"`
}
type ClusterGenerator struct {
db db.ArgoDB
clientSet *kubernetes.Clientset
config *rest.Config
}
func NewClusterGenerator(db db.ArgoDB, clientSet *kubernetes.Clientset, config *rest.Config) Generator {
return &ClusterGenerator{db, clientSet, config}
}
func (cg *ClusterGenerator) getClusterCredentials(namespace string, releaseSuffix string) ([]byte, []byte, []byte, error) {
cmd := []string{
"sh",
"-c",
"cat /root/.kube/config",
}
var stdout, stderr, stdin bytes.Buffer
option := &v1.PodExecOptions{
Command: cmd,
Container: "syncer",
Stdin: true,
Stdout: true,
Stderr: true,
TTY: true,
}
req := cg.clientSet.CoreV1().RESTClient().Post().Resource("pods").Name(POD_PREFIX + "-" + releaseSuffix + "-0").
Namespace(namespace).SubResource("exec")
req.VersionedParams(
option,
scheme.ParameterCodec,
)
exec, err := remotecommand.NewSPDYExecutor(cg.config, "POST", req.URL())
if err != nil {
return nil, nil, nil, err
}
err = exec.Stream(remotecommand.StreamOptions{
Stdin: &stdin,
Stdout: &stdout,
Stderr: &stderr,
})
if err != nil {
return nil, nil, nil, err
}
var config Config
err = yaml.Unmarshal(stdout.Bytes(), &config)
if err != nil {
return nil, nil, nil, err
}
if len(config.Clusters) == 0 {
return nil, nil, nil, errors.New("clusters empty")
}
caData, err := base64.StdEncoding.DecodeString(config.Clusters[0].Cluster.CertificateAuthorityData)
if err != nil {
return nil, nil, nil, err
}
cert, err := base64.StdEncoding.DecodeString(config.AuthInfos[0].AuthInfo.ClientCertificateData)
if err != nil {
return nil, nil, nil, err
}
key, err := base64.StdEncoding.DecodeString(config.AuthInfos[0].AuthInfo.ClientKeyData)
if err != nil {
return nil, nil, nil, err
}
return caData, cert, key, nil
}
// TODO: also should provision service for vcluster pod
func (cg *ClusterGenerator) installVCluster(opts *util.GenerateOpts, namespace string, releaseName string) error {
cmd, err := helm.NewCmd("/tmp", "v3", "")
if err != nil {
return err
}
log.Print("Execute helm install command")
_, err = cmd.Freestyle("upgrade", "--install", releaseName, "vcluster", "--values", opts.ClusterOpts.ValuesFilePath, "--repo", "https://charts.loft.sh", "--namespace", namespace, "--repository-config", "", "--create-namespace", "--wait")
if err != nil {
return err
}
return nil
}
func (cg *ClusterGenerator) getClusterServerUri(namespace string, releaseSuffix string) (string, error) {
pod, err := cg.clientSet.CoreV1().Pods(namespace).Get(context.TODO(), POD_PREFIX+"-"+releaseSuffix+"-0", v12.GetOptions{})
if err != nil {
return "", err
}
// TODO: should be moved to service instead pod
log.Printf("Get service for https://" + pod.Status.PodIP + ":8443")
return "https://" + pod.Status.PodIP + ":8443", nil
}
func (cg *ClusterGenerator) retrieveClusterUri(namespace, releaseSuffix string) (string, error) {
for i := 0; i < 10; i++ {
log.Printf("Attempting to get cluster uri")
uri, err := cg.getClusterServerUri(namespace, releaseSuffix)
if err != nil {
log.Printf("Failed to get cluster uri due to %s", err.Error())
time.Sleep(10 * time.Second)
continue
}
return uri, nil
}
return "", nil
}
func (cg *ClusterGenerator) generate(i int, opts *util.GenerateOpts) error {
log.Printf("Generate cluster #%v of #%v", i, opts.ClusterOpts.Samples)
namespace := opts.ClusterOpts.NamespacePrefix + "-" + util.GetRandomString()
log.Printf("Namespace is %s", namespace)
releaseSuffix := util.GetRandomString()
log.Printf("Release suffix is %s", namespace)
err := cg.installVCluster(opts, namespace, POD_PREFIX+"-"+releaseSuffix)
if err != nil {
log.Printf("Skip cluster installation due error %v", err.Error())
}
log.Print("Get cluster credentials")
caData, cert, key, err := cg.getClusterCredentials(namespace, releaseSuffix)
for o := 0; o < 5; o++ {
if err == nil {
break
}
log.Printf("Failed to get cluster credentials %s, retrying...", releaseSuffix)
time.Sleep(10 * time.Second)
caData, cert, key, err = cg.getClusterCredentials(namespace, releaseSuffix)
}
if err != nil {
return err
}
log.Print("Get cluster server uri")
uri, err := cg.retrieveClusterUri(namespace, releaseSuffix)
if err != nil {
return err
}
log.Printf("Cluster server uri is %s", uri)
log.Print("Create cluster")
_, err = cg.db.CreateCluster(context.TODO(), &argoappv1.Cluster{
Server: uri,
Name: opts.ClusterOpts.ClusterNamePrefix + "-" + util.GetRandomString(),
Config: argoappv1.ClusterConfig{
TLSClientConfig: argoappv1.TLSClientConfig{
Insecure: false,
ServerName: "kubernetes.default.svc",
CAData: caData,
CertData: cert,
KeyData: key,
},
},
ConnectionState: argoappv1.ConnectionState{},
ServerVersion: "1.18",
Namespaces: []string{opts.ClusterOpts.DestinationNamespace},
Labels: labels,
})
if err != nil {
return err
}
return nil
}
func (cg *ClusterGenerator) Generate(opts *util.GenerateOpts) error {
log.Printf("Excute in parallel with %v", opts.ClusterOpts.Concurrency)
wg := util.New(opts.ClusterOpts.Concurrency)
for l := 1; l <= opts.ClusterOpts.Samples; l++ {
wg.Add()
go func(i int) {
defer wg.Done()
err := cg.generate(i, opts)
if err != nil {
log.Printf("Failed to generate cluster #%v due to : %s", i, err.Error())
}
}(l)
}
wg.Wait()
return nil
}
func (cg *ClusterGenerator) Clean(opts *util.GenerateOpts) error {
log.Printf("Clean clusters")
namespaces, err := cg.clientSet.CoreV1().Namespaces().List(context.TODO(), v12.ListOptions{})
if err != nil {
return err
}
for _, ns := range namespaces.Items {
if strings.HasPrefix(ns.Name, POD_PREFIX) {
log.Printf("Delete namespace %s", ns.Name)
err = cg.clientSet.CoreV1().Namespaces().Delete(context.TODO(), ns.Name, v12.DeleteOptions{})
if err != nil {
log.Printf("Delete namespace failed due: %s", err.Error())
}
}
}
secrets := cg.clientSet.CoreV1().Secrets(opts.Namespace)
return secrets.DeleteCollection(context.TODO(), v12.DeleteOptions{}, v12.ListOptions{
LabelSelector: "app.kubernetes.io/generated-by=argocd-generator",
})
}