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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/constants"
"github.com/juju/juju/caas/kubernetes/provider/utils"
"github.com/juju/juju/caas/specs"
)
func (k *kubernetesClient) getConfigMapLabels(appName string) map[string]string {
return utils.LabelsForApp(appName, k.IsLegacyLabels())
}
func (k *kubernetesClient) ensureConfigMaps(
appName string,
annotations map[string]string,
cms map[string]specs.ConfigMap,
) (cleanUps []func(), _ error) {
if k.namespace == "" {
return nil, errNoNamespace
}
for name, v := range cms {
spec := &core.ConfigMap{
ObjectMeta: v1.ObjectMeta{
Name: name,
Namespace: k.namespace,
Labels: k.getConfigMapLabels(appName),
Annotations: annotations,
},
Data: v,
}
cmCleanup, err := k.ensureConfigMap(spec)
cleanUps = append(cleanUps, cmCleanup)
if err != nil {
return cleanUps, errors.Trace(err)
}
}
return cleanUps, nil
}
// ensureConfigMapLegacy is a tmp fix for upgrading configmap(no proper labels) created in 2.6.
// TODO(caas): remove this and use "updateConfigMap" once `environupgrader` supports CaaS models.
func (k *kubernetesClient) ensureConfigMapLegacy(cm *core.ConfigMap) (cleanUp func(), err error) {
cleanUp = func() {}
if k.namespace == "" {
return cleanUp, errNoNamespace
}
api := k.client().CoreV1().ConfigMaps(k.namespace)
_, err = api.Update(context.TODO(), cm, v1.UpdateOptions{})
if k8serrors.IsNotFound(err) {
var out *core.ConfigMap
if out, err = api.Create(context.TODO(), cm, v1.CreateOptions{}); err == nil {
logger.Debugf("configmap %q created", out.GetName())
cleanUp = func() { _ = k.deleteConfigMap(out.GetName(), out.GetUID()) }
return cleanUp, nil
}
}
return cleanUp, errors.Trace(err)
}
// ensureConfigMap ensures a ConfigMap resource.
func (k *kubernetesClient) ensureConfigMap(cm *core.ConfigMap) (func(), error) {
cleanUp := func() {}
out, err := k.createConfigMap(cm)
if err == nil {
logger.Debugf("configmap %q created", out.GetName())
cleanUp = func() { _ = k.deleteConfigMap(out.GetName(), out.GetUID()) }
return cleanUp, nil
}
if !errors.IsAlreadyExists(err) {
return cleanUp, errors.Trace(err)
}
err = k.updateConfigMap(cm)
logger.Debugf("updating configmap %q", cm.GetName())
return cleanUp, errors.Trace(err)
}
func (k *kubernetesClient) updateConfigMap(cm *core.ConfigMap) error {
if k.namespace == "" {
return errNoNamespace
}
_, err := k.client().CoreV1().ConfigMaps(k.namespace).Update(context.TODO(), 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(name string) (*core.ConfigMap, error) {
if k.namespace == "" {
return nil, errNoNamespace
}
cm, err := k.client().CoreV1().ConfigMaps(k.namespace).Get(context.TODO(), 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(cm *core.ConfigMap) (*core.ConfigMap, error) {
if k.namespace == "" {
return nil, errNoNamespace
}
utils.PurifyResource(cm)
out, err := k.client().CoreV1().ConfigMaps(k.namespace).Create(context.TODO(), 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(name string, uid types.UID) error {
if k.namespace == "" {
return errNoNamespace
}
err := k.client().CoreV1().ConfigMaps(k.namespace).Delete(context.TODO(), name, utils.NewPreconditionDeleteOptions(uid))
if k8serrors.IsNotFound(err) {
return nil
}
return errors.Trace(err)
}
func (k *kubernetesClient) deleteConfigMaps(appName string) error {
if k.namespace == "" {
return errNoNamespace
}
err := k.client().CoreV1().ConfigMaps(k.namespace).DeleteCollection(context.TODO(), v1.DeleteOptions{
PropagationPolicy: constants.DefaultPropagationPolicy(),
}, v1.ListOptions{
LabelSelector: utils.LabelsToSelector(k.getConfigMapLabels(appName)).String(),
})
if k8serrors.IsNotFound(err) {
return nil
}
return errors.Trace(err)
}