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doguSupportManager.go
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doguSupportManager.go
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package controllers
import (
"context"
"fmt"
"github.com/cloudogu/cesapp-lib/core"
"github.com/cloudogu/cesapp-lib/registry"
k8sv1 "github.com/cloudogu/k8s-dogu-operator/api/v1"
"github.com/cloudogu/k8s-dogu-operator/controllers/limit"
"github.com/cloudogu/k8s-dogu-operator/controllers/resource"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/tools/record"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/log"
)
const SupportModeEnvVar = "SUPPORT_MODE"
// podTemplateResourceGenerator is used to generate pod templates.
type podTemplateResourceGenerator interface {
GetPodTemplate(*k8sv1.Dogu, *core.Dogu) (*corev1.PodTemplateSpec, error)
}
// doguSupportManager is used to handle the support mode for dogus.
type doguSupportManager struct {
client client.Client
scheme *runtime.Scheme
doguRegistry registry.DoguRegistry
resourceGenerator podTemplateResourceGenerator
eventRecorder record.EventRecorder
}
// NewDoguSupportManager creates a new instance of doguSupportManager.
func NewDoguSupportManager(client client.Client, cesRegistry registry.Registry, eventRecorder record.EventRecorder) *doguSupportManager {
resourceGenerator := resource.NewResourceGenerator(client.Scheme(), limit.NewDoguDeploymentLimitPatcher(cesRegistry))
return &doguSupportManager{
client: client,
doguRegistry: cesRegistry.DoguRegistry(),
resourceGenerator: resourceGenerator,
eventRecorder: eventRecorder,
}
}
// HandleSupportMode handles the support flag in the dogu spec and returns whether the support modes changed during the
// last operation. If any action failed a non-requeue-able error will be returned.
func (dsm *doguSupportManager) HandleSupportMode(ctx context.Context, doguResource *k8sv1.Dogu) (bool, error) {
logger := log.FromContext(ctx)
deployment := &appsv1.Deployment{}
err := dsm.client.Get(ctx, doguResource.GetObjectKey(), deployment)
if err != nil {
if errors.IsNotFound(err) {
dsm.eventRecorder.Eventf(doguResource, corev1.EventTypeWarning, SupportEventReason, "No deployment found for dogu %s when checking support handler", doguResource.Name)
return false, nil
}
return false, fmt.Errorf("failed to get deployment of dogu %s: %w", doguResource.Name, err)
}
logger.Info(fmt.Sprintf("Check if support mode is currently active for dogu %s...", doguResource.Name))
active := isDeploymentInSupportMode(deployment)
if !supportModeChanged(doguResource, active) {
return false, nil
}
logger.Info(fmt.Sprintf("Update deployment for dogu %s...", doguResource.Name))
err = dsm.updateDeployment(ctx, doguResource, deployment)
if err != nil {
return false, err
}
dsm.eventRecorder.Eventf(doguResource, corev1.EventTypeNormal, SupportEventReason, "Support flag changed to %t. Deployment updated.", doguResource.Spec.SupportMode)
return true, nil
}
func (dsm *doguSupportManager) updateDeployment(ctx context.Context, doguResource *k8sv1.Dogu, deployment *appsv1.Deployment) error {
dogu, err := dsm.doguRegistry.Get(doguResource.Name)
if err != nil {
return fmt.Errorf("failed to get dogu descriptor of dogu %s: %w", doguResource.Name, err)
}
podTemplate, err := dsm.resourceGenerator.GetPodTemplate(doguResource, dogu)
if err != nil {
return err
}
if doguResource.Spec.SupportMode {
setDoguPodTemplateInSupportMode(doguResource, podTemplate)
}
deployment.Spec.Template = *podTemplate
err = dsm.client.Update(ctx, deployment)
if err != nil {
return fmt.Errorf("failed to update dogu deployment %s: %w", doguResource.Name, err)
}
return nil
}
func setDoguPodTemplateInSupportMode(doguResource *k8sv1.Dogu, template *corev1.PodTemplateSpec) *corev1.PodTemplateSpec {
for index := range template.Spec.Containers {
container := &template.Spec.Containers[index]
if container.Name == doguResource.Name {
container.LivenessProbe = nil
container.ReadinessProbe = nil
container.StartupProbe = nil
container.Command = []string{"/bin/bash", "-c", "--"}
container.Args = []string{"while true; do sleep 5; done;"}
container.Env = append(container.Env, corev1.EnvVar{Name: SupportModeEnvVar, Value: "true"})
}
}
return template
}
func isDeploymentInSupportMode(deployment *appsv1.Deployment) bool {
for _, container := range deployment.Spec.Template.Spec.Containers {
envVars := container.Env
for _, env := range envVars {
if env.Name == SupportModeEnvVar && env.Value == "true" {
return true
}
}
}
return false
}
func supportModeChanged(doguResource *k8sv1.Dogu, active bool) bool {
mode := doguResource.Spec.SupportMode
if mode && active || !mode && !active {
return false
}
return true
}