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deployment.go
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deployment.go
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package k8s
import (
"fmt"
"strings"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"github.com/spotahome/redis-operator/log"
)
// Deployment the Deployment service that knows how to interact with k8s to manage them
type Deployment interface {
GetDeployment(namespace, name string) (*appsv1.Deployment, error)
GetDeploymentPods(namespace, name string) (*corev1.PodList, error)
CreateDeployment(namespace string, deployment *appsv1.Deployment) error
UpdateDeployment(namespace string, deployment *appsv1.Deployment) error
CreateOrUpdateDeployment(namespace string, deployment *appsv1.Deployment) error
DeleteDeployment(namespace string, name string) error
ListDeployments(namespace string) (*appsv1.DeploymentList, error)
}
// DeploymentService is the service account service implementation using API calls to kubernetes.
type DeploymentService struct {
kubeClient kubernetes.Interface
logger log.Logger
}
// NewDeploymentService returns a new Deployment KubeService.
func NewDeploymentService(kubeClient kubernetes.Interface, logger log.Logger) *DeploymentService {
logger = logger.With("service", "k8s.deployment")
return &DeploymentService{
kubeClient: kubeClient,
logger: logger,
}
}
// GetDeployment will retrieve the requested deployment based on namespace and name
func (d *DeploymentService) GetDeployment(namespace, name string) (*appsv1.Deployment, error) {
deployment, err := d.kubeClient.AppsV1().Deployments(namespace).Get(name, metav1.GetOptions{})
if err != nil {
return nil, err
}
return deployment, err
}
// GetDeploymentPods will retrieve the pods managed by a given deployment
func (d *DeploymentService) GetDeploymentPods(namespace, name string) (*corev1.PodList, error) {
deployment, err := d.kubeClient.AppsV1().Deployments(namespace).Get(name, metav1.GetOptions{})
if err != nil {
return nil, err
}
labels := []string{}
for k, v := range deployment.Spec.Selector.MatchLabels {
labels = append(labels, fmt.Sprintf("%s=%s", k, v))
}
selector := strings.Join(labels, ",")
return d.kubeClient.CoreV1().Pods(namespace).List(metav1.ListOptions{LabelSelector: selector})
}
// CreateDeployment will create the given deployment
func (d *DeploymentService) CreateDeployment(namespace string, deployment *appsv1.Deployment) error {
_, err := d.kubeClient.AppsV1().Deployments(namespace).Create(deployment)
if err != nil {
return err
}
d.logger.WithField("namespace", namespace).WithField("deployment", deployment.ObjectMeta.Name).Infof("deployment created")
return err
}
// UpdateDeployment will update the given deployment
func (d *DeploymentService) UpdateDeployment(namespace string, deployment *appsv1.Deployment) error {
_, err := d.kubeClient.AppsV1().Deployments(namespace).Update(deployment)
if err != nil {
return err
}
d.logger.WithField("namespace", namespace).WithField("deployment", deployment.ObjectMeta.Name).Infof("deployment updated")
return err
}
// CreateOrUpdateDeployment will update the given deployment or create it if does not exist
func (d *DeploymentService) CreateOrUpdateDeployment(namespace string, deployment *appsv1.Deployment) error {
storedDeployment, err := d.GetDeployment(namespace, deployment.Name)
if err != nil {
// If no resource we need to create.
if errors.IsNotFound(err) {
return d.CreateDeployment(namespace, deployment)
}
return err
}
// Already exists, need to Update.
// Set the correct resource version to ensure we are on the latest version. This way the only valid
// namespace is our spec(https://github.com/kubernetes/community/blob/master/contributors/devel/api-conventions.md#concurrency-control-and-consistency),
// we will replace the current namespace state.
deployment.ResourceVersion = storedDeployment.ResourceVersion
return d.UpdateDeployment(namespace, deployment)
}
// DeleteDeployment will delete the given deployment
func (d *DeploymentService) DeleteDeployment(namespace, name string) error {
propagation := metav1.DeletePropagationForeground
return d.kubeClient.AppsV1().Deployments(namespace).Delete(name, &metav1.DeleteOptions{PropagationPolicy: &propagation})
}
// ListDeployments will give all the deployments on a given namespace
func (d *DeploymentService) ListDeployments(namespace string) (*appsv1.DeploymentList, error) {
return d.kubeClient.AppsV1().Deployments(namespace).List(metav1.ListOptions{})
}