mirror of
https://github.com/stakater/Reloader.git
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109 lines
4.2 KiB
Go
109 lines
4.2 KiB
Go
package utils
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import (
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"context"
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"time"
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appsv1 "k8s.io/api/apps/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/client-go/kubernetes"
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)
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// StatefulSetAdapter implements WorkloadAdapter for Kubernetes StatefulSets.
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type StatefulSetAdapter struct {
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client kubernetes.Interface
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}
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// NewStatefulSetAdapter creates a new StatefulSetAdapter.
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func NewStatefulSetAdapter(client kubernetes.Interface) *StatefulSetAdapter {
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return &StatefulSetAdapter{client: client}
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}
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// Type returns the workload type.
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func (a *StatefulSetAdapter) Type() WorkloadType {
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return WorkloadStatefulSet
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}
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// Create creates a StatefulSet with the given config.
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func (a *StatefulSetAdapter) Create(ctx context.Context, namespace, name string, cfg WorkloadConfig) error {
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opts := buildStatefulSetOptions(cfg)
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_, err := CreateStatefulSet(ctx, a.client, namespace, name, opts...)
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return err
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}
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// Delete removes the StatefulSet.
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func (a *StatefulSetAdapter) Delete(ctx context.Context, namespace, name string) error {
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return DeleteStatefulSet(ctx, a.client, namespace, name)
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}
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// WaitReady waits for the StatefulSet to be ready using watches.
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func (a *StatefulSetAdapter) WaitReady(ctx context.Context, namespace, name string, timeout time.Duration) error {
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watchFunc := func(ctx context.Context, opts metav1.ListOptions) (watch.Interface, error) {
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return a.client.AppsV1().StatefulSets(namespace).Watch(ctx, opts)
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}
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_, err := WatchUntil(ctx, watchFunc, name, IsReady(StatefulSetIsReady), timeout)
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return err
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}
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// WaitReloaded waits for the StatefulSet to have the reload annotation using watches.
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// Captures the current annotation value first to avoid false positives from prior reloads.
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func (a *StatefulSetAdapter) WaitReloaded(ctx context.Context, namespace, name, annotationKey string, timeout time.Duration) (bool, error) {
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priorValue, _ := a.GetPodTemplateAnnotation(ctx, namespace, name, annotationKey)
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watchFunc := func(ctx context.Context, opts metav1.ListOptions) (watch.Interface, error) {
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return a.client.AppsV1().StatefulSets(namespace).Watch(ctx, opts)
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}
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_, err := WatchUntil(ctx, watchFunc, name, HasPodTemplateAnnotationChanged(StatefulSetPodTemplate, annotationKey, priorValue), timeout)
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return HandleWatchResult(err)
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}
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// WaitEnvVar waits for the StatefulSet to have a STAKATER_ env var using watches.
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// Captures the current env var value first to avoid false positives from prior reloads.
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func (a *StatefulSetAdapter) WaitEnvVar(ctx context.Context, namespace, name, prefix string, timeout time.Duration) (bool, error) {
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priorValue := ""
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if sts, err := a.client.AppsV1().StatefulSets(namespace).Get(ctx, name, metav1.GetOptions{}); err == nil {
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priorValue = GetEnvVarValueByPrefix(sts.Spec.Template.Spec.Containers, prefix)
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}
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watchFunc := func(ctx context.Context, opts metav1.ListOptions) (watch.Interface, error) {
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return a.client.AppsV1().StatefulSets(namespace).Watch(ctx, opts)
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}
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_, err := WatchUntil(ctx, watchFunc, name, HasEnvVarPrefixChanged(StatefulSetContainers, prefix, priorValue), timeout)
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return HandleWatchResult(err)
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}
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// SupportsEnvVarStrategy returns true as StatefulSets support env var reload strategy.
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func (a *StatefulSetAdapter) SupportsEnvVarStrategy() bool {
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return true
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}
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// RequiresSpecialHandling returns false as StatefulSets use standard rolling restart.
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func (a *StatefulSetAdapter) RequiresSpecialHandling() bool {
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return false
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}
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// GetPodTemplateAnnotation returns the value of a pod template annotation.
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func (a *StatefulSetAdapter) GetPodTemplateAnnotation(ctx context.Context, namespace, name, annotationKey string) (string, error) {
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sts, err := a.client.AppsV1().StatefulSets(namespace).Get(ctx, name, metav1.GetOptions{})
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if err != nil {
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return "", err
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}
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return sts.Spec.Template.Annotations[annotationKey], nil
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}
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// buildStatefulSetOptions converts WorkloadConfig to StatefulSetOption slice.
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func buildStatefulSetOptions(cfg WorkloadConfig) []StatefulSetOption {
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return []StatefulSetOption{
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func(sts *appsv1.StatefulSet) {
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if len(cfg.Annotations) > 0 {
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if sts.Annotations == nil {
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sts.Annotations = make(map[string]string)
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}
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for k, v := range cfg.Annotations {
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sts.Annotations[k] = v
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}
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}
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ApplyWorkloadConfig(&sts.Spec.Template, cfg)
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},
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}
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}
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