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template.go
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template.go
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package cmd
import (
"context"
"encoding/json"
"fmt"
"regexp"
"strconv"
"strings"
"github.com/harvester/harvester/pkg/apis/harvesterhci.io/v1beta1"
harvclient "github.com/harvester/harvester/pkg/generated/clientset/versioned"
rcmd "github.com/rancher/cli/cmd"
"github.com/urfave/cli"
"gopkg.in/yaml.v3"
v1 "k8s.io/api/core/v1"
k8smetav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
const (
templateIDLabel string = "template.harvesterhci.io/templateID"
templateClaimTemp string = "harvesterhci.io/volumeClaimTemplates"
imageIDAnnot string = "harvesterhci.io/imageId"
sshkeyAnnotation string = "harvesterhci.io/sshNames"
)
type TemplateData struct {
Name string
Version int
Image string
Cpus uint32
Memory string
Interfaces []Interface
Keypairs []string
Volumes []Volume
}
type Volume struct {
Name string
Type string
PersistentVolumeClaim PersistentVolumeClaimObject `yaml:"persistentVolumeClaim,omitempty"`
CloudInitData CloudInitObject `yaml:"cloudInit,omitempty"`
}
type PersistentVolumeClaimObject struct {
ClaimName string
Size string
}
type CloudInitObject struct {
Name string
NetworkData string
UserData string
}
type Interface struct {
Name string
Type string
NetworkType string
NetworkName string
}
// TemplateCommand defines the CLI command that lists VM templates in Harvester
func TemplateCommand() cli.Command {
return cli.Command{
Name: "template",
Aliases: []string{"tpl"},
Usage: "Manipulate VM templates",
Action: templateList,
Flags: []cli.Flag{
nsFlag,
},
Subcommands: cli.Commands{
cli.Command{
Name: "list",
Aliases: []string{"ls"},
Usage: "List templates",
Description: "\nLists all the VM templates available in Harvester",
ArgsUsage: "None",
Action: templateList,
Flags: []cli.Flag{
nsFlag,
},
},
cli.Command{
Name: "show",
Aliases: []string{"get"},
Usage: "show the content of a VM template",
Description: "\nshows information about the VM template given as an argument",
ArgsUsage: "VM_TEMPLATE:VERSION",
Action: templateShow,
Flags: []cli.Flag{
nsFlag,
},
},
},
}
}
func templateList(ctx *cli.Context) (err error) {
c, err := GetHarvesterClient(ctx)
if err != nil {
return
}
tplList, err := c.HarvesterhciV1beta1().VirtualMachineTemplates(ctx.String("namespace")).List(context.TODO(), k8smetav1.ListOptions{})
if err != nil {
return
}
writer := rcmd.NewTableWriter([][]string{
{"NAME", "Name"},
{"LATEST_VERSION", "LatestVersion"},
},
ctx)
defer writer.Close()
for _, tplItem := range tplList.Items {
writer.Write(&TemplateData{
Name: tplItem.Name,
Version: tplItem.Status.LatestVersion,
})
}
return writer.Err()
}
//templateShow prints the content of the VM template in argument given the CLI context
// It checks that the number of arguments provided is equal to one then queries the VirtualMachineTemplateVersion to print its content in YAML format.
func templateShow(ctx *cli.Context) error {
if len(ctx.Args()) != 1 {
return fmt.Errorf("wrong number of arguments, one and only one argument is accepted by this method")
}
vmTemplateArg := ctx.Args().First()
pattern, err := regexp.Compile(`[a-zA-Z0-9\-]*:[0-9]?`)
if err != nil {
return err
}
if !pattern.MatchString(vmTemplateArg) {
return fmt.Errorf("the argument provide does not have the right format, please give a VM template with a version in the format <VM_TEMPLATE_NAME>:<VERSION>")
}
c, err := GetHarvesterClient(ctx)
if err != nil {
return err
}
// Getting the template name and the version from the argument
expArray := SplitOnColon(vmTemplateArg)
vmTemplateName := expArray[0]
vmTemplateVersion, err := strconv.Atoi(expArray[1])
if err != nil {
return fmt.Errorf("failed to convert version to integer, %w", err)
}
vmTemplateNameWithNS := vmTemplateName
matchingVMTemplate, err := fetchTemplateVersionFromInt(ctx.String("namespace"), c, vmTemplateVersion, vmTemplateNameWithNS)
if err != nil {
return fmt.Errorf("error during querying VM Template, %w", err)
}
// matchingVMTemplate.ManagedFields = []k8smetav1.ManagedFieldsEntry{}
// matchingVMTemplate.OwnerReferences = []k8smetav1.OwnerReference{}
// scheme := runtime.NewScheme()
// yamlSerializer := json.NewSerializerWithOptions(json.DefaultMetaFactory, scheme, scheme, json.SerializerOptions{Yaml: true, Strict: false})
// err = yamlSerializer.Encode(matchingVMTemplate, os.Stdout)
// if err != nil {
// return fmt.Errorf("failed during encoding an object to YAML: %w", err)
// }
imageName, err := getImageName(matchingVMTemplate, c)
if err != nil {
return err
}
var toShowTemplate TemplateData
toShowTemplate.Name = matchingVMTemplate.Labels[templateIDLabel]
toShowTemplate.Version = matchingVMTemplate.Status.Version
toShowTemplate.Cpus = matchingVMTemplate.Spec.VM.Spec.Template.Spec.Domain.CPU.Cores
toShowTemplate.Memory = matchingVMTemplate.Spec.VM.Spec.Template.Spec.Domain.Resources.Limits.Memory().String()
toShowTemplate.Volumes, err = mapVolumeData(ctx, matchingVMTemplate)
if err != nil {
return err
}
var keypairsFromTemplate []string
err = json.Unmarshal(([]byte)(matchingVMTemplate.Spec.VM.Spec.Template.ObjectMeta.Annotations[sshkeyAnnotation]), &keypairsFromTemplate)
toShowTemplate.Keypairs = keypairsFromTemplate
if err != nil {
return err
}
toShowTemplate.Interfaces = mapInterfaceData(matchingVMTemplate)
toShowTemplate.Image = imageName
templateYAMLbytes, err := yaml.Marshal(&toShowTemplate)
if err != nil {
return fmt.Errorf("failed during encoding an object to YAML: %w", err)
}
var templateYAMLstring string = string(templateYAMLbytes)
fmt.Println(templateYAMLstring)
return nil
}
func mapVolumeData(ctx *cli.Context, matchingVMTemplate *v1beta1.VirtualMachineTemplateVersion) (volumes []Volume, err error) {
for _, origVolume := range matchingVMTemplate.Spec.VM.Spec.Template.Spec.Volumes {
if origVolume.VolumeSource.PersistentVolumeClaim != nil {
size, err := getPvcSizeFromMatchingAnnotation(origVolume.PersistentVolumeClaim.ClaimName, matchingVMTemplate)
if err != nil {
return []Volume{}, err
}
volumes = append(volumes, Volume{
Name: origVolume.Name,
Type: "persistentVolumeClaim",
PersistentVolumeClaim: PersistentVolumeClaimObject{
ClaimName: origVolume.PersistentVolumeClaim.ClaimName,
Size: size,
},
})
}
if origVolume.VolumeSource.CloudInitNoCloud != nil {
networkData, err := getCloudInitDataFromSecret(ctx, origVolume.CloudInitNoCloud.UserDataSecretRef.Name, matchingVMTemplate.Namespace, "networkdata")
if err != nil {
return []Volume{}, err
}
userData, err := getCloudInitDataFromSecret(ctx, origVolume.CloudInitNoCloud.UserDataSecretRef.Name, matchingVMTemplate.Namespace, "userdata")
if err != nil {
return []Volume{}, err
}
volumes = append(volumes, Volume{
Name: origVolume.Name,
Type: "cloudInit",
CloudInitData: CloudInitObject{
Name: origVolume.CloudInitNoCloud.UserDataSecretRef.Name,
NetworkData: networkData,
UserData: userData,
},
})
}
}
return
}
func getCloudInitDataFromSecret(ctx *cli.Context, secretName, namespace, dataType string) (data string, err error) {
c, err := GetKubeClient(ctx)
if err != nil {
return
}
cloudInitSecretContent, err1 := c.CoreV1().Secrets(namespace).Get(context.TODO(), secretName, k8smetav1.GetOptions{})
if err1 != nil {
err = fmt.Errorf("error during getting cloud-init secret: %w", err1)
return
}
data = string(cloudInitSecretContent.Data[dataType])
return
}
func getPvcSizeFromMatchingAnnotation(claimName string, matchingVMTemplate *v1beta1.VirtualMachineTemplateVersion) (size string, err error) {
claims, err := getPvcFromAnnotation(matchingVMTemplate)
if err != nil {
return
}
var matchingClaimFromAnnotation v1.PersistentVolumeClaim
for _, claim := range claims {
if claim.Name == claimName {
matchingClaimFromAnnotation = claim
}
}
size = matchingClaimFromAnnotation.Spec.Resources.Requests.Storage().String()
return
}
func getImageName(matchingVMTemplate *v1beta1.VirtualMachineTemplateVersion, c *harvclient.Clientset) (image string, err error) {
claimObjectList, err1 := getPvcFromAnnotation(matchingVMTemplate)
image = ""
if err1 != nil {
err = fmt.Errorf("error during unmarshalling an annotation, %w", err1)
return
}
var imageIDFull string
for _, claimObject := range claimObjectList {
if claimObject.Annotations[imageIDAnnot] != "" {
imageIDFull = claimObject.ObjectMeta.Annotations[imageIDAnnot]
}
}
if imageIDFull == "" {
err = fmt.Errorf("no ImageID found in template")
return
}
imageNS := strings.Split(imageIDFull, "/")[0]
imageID := strings.Split(imageIDFull, "/")[1]
imageObject, err1 := c.HarvesterhciV1beta1().VirtualMachineImages(imageNS).Get(context.TODO(), imageID, k8smetav1.GetOptions{})
if err1 != nil {
err = fmt.Errorf("error during getting image object, %w", err1)
return
}
image = imageObject.Spec.DisplayName
return
}
func getPvcFromAnnotation(matchingVMTemplate *v1beta1.VirtualMachineTemplateVersion) ([]v1.PersistentVolumeClaim, error) {
claimAnnot := matchingVMTemplate.Spec.VM.ObjectMeta.Annotations[templateClaimTemp]
// fmt.Printf("Annotation:\n%s", claimAnnot)
claimObjectList := []v1.PersistentVolumeClaim{}
err1 := json.Unmarshal([]byte(claimAnnot), &claimObjectList)
return claimObjectList, err1
}
func mapInterfaceData(vmTemplateVersion *v1beta1.VirtualMachineTemplateVersion) []Interface {
result := []Interface{}
origInterfaces := vmTemplateVersion.Spec.VM.Spec.Template.Spec.Domain.Devices.Interfaces
for _, origInterface := range origInterfaces {
networkName := ""
networkType := ""
for _, origNetwork := range vmTemplateVersion.Spec.VM.Spec.Template.Spec.Networks {
if origNetwork.Name == origInterface.Name {
if origNetwork.NetworkSource.Multus != nil {
networkName = origNetwork.NetworkSource.Multus.NetworkName
networkType = "multus"
} else {
networkType = "pod"
}
}
}
targetInterface := Interface{
Name: origInterface.Name,
Type: origInterface.Model,
NetworkName: networkName,
NetworkType: networkType,
}
result = append(result, targetInterface)
}
return result
}