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configmap.go
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configmap.go
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// Copyright 2019 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package provider
import (
"context"
"github.com/juju/errors"
core "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"github.com/juju/juju/caas/kubernetes/provider/utils"
)
// ensureConfigMap ensures a ConfigMap resource.
func (k *kubernetesClient) ensureConfigMap(ctx context.Context, cm *core.ConfigMap) (func(), error) {
cleanUp := func() {}
out, err := k.createConfigMap(ctx, cm)
if err == nil {
logger.Debugf("configmap %q created", out.GetName())
cleanUp = func() { _ = k.deleteConfigMap(ctx, out.GetName(), out.GetUID()) }
return cleanUp, nil
}
if !errors.Is(err, errors.AlreadyExists) {
return cleanUp, errors.Trace(err)
}
err = k.updateConfigMap(ctx, cm)
logger.Debugf("updating configmap %q", cm.GetName())
return cleanUp, errors.Trace(err)
}
func (k *kubernetesClient) updateConfigMap(ctx context.Context, cm *core.ConfigMap) error {
if k.namespace == "" {
return errNoNamespace
}
_, err := k.client().CoreV1().ConfigMaps(k.namespace).Update(ctx, cm, v1.UpdateOptions{})
if k8serrors.IsNotFound(err) {
return errors.NotFoundf("configmap %q", cm.GetName())
}
return errors.Trace(err)
}
// getConfigMap returns a ConfigMap resource.
func (k *kubernetesClient) getConfigMap(ctx context.Context, name string) (*core.ConfigMap, error) {
if k.namespace == "" {
return nil, errNoNamespace
}
cm, err := k.client().CoreV1().ConfigMaps(k.namespace).Get(ctx, name, v1.GetOptions{})
if err != nil {
if k8serrors.IsNotFound(err) {
return nil, errors.NotFoundf("configmap %q", name)
}
return nil, errors.Trace(err)
}
return cm, nil
}
// createConfigMap creates a ConfigMap resource.
func (k *kubernetesClient) createConfigMap(ctx context.Context, cm *core.ConfigMap) (*core.ConfigMap, error) {
if k.namespace == "" {
return nil, errNoNamespace
}
utils.PurifyResource(cm)
out, err := k.client().CoreV1().ConfigMaps(k.namespace).Create(ctx, cm, v1.CreateOptions{})
if k8serrors.IsAlreadyExists(err) {
return nil, errors.AlreadyExistsf("configmap %q", cm.GetName())
}
return out, errors.Trace(err)
}
// deleteConfigMap deletes a ConfigMap resource.
func (k *kubernetesClient) deleteConfigMap(ctx context.Context, name string, uid types.UID) error {
if k.namespace == "" {
return errNoNamespace
}
err := k.client().CoreV1().ConfigMaps(k.namespace).Delete(ctx, name, utils.NewPreconditionDeleteOptions(uid))
if k8serrors.IsNotFound(err) {
return nil
}
return errors.Trace(err)
}