/
teardown.go
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/
teardown.go
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// Copyright 2020 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package provider
import (
"context"
"sync"
"time"
jujuclock "github.com/juju/clock"
"github.com/juju/errors"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
k8slabels "k8s.io/apimachinery/pkg/labels"
"github.com/juju/juju/caas/kubernetes/provider/utils"
"github.com/juju/juju/core/watcher"
)
func (k *kubernetesClient) deleteClusterScopeResourcesModelTeardown(ctx context.Context, wg *sync.WaitGroup, errChan chan<- error) {
defer wg.Done()
labels := utils.LabelsForModel(k.CurrentModel(), k.IsLegacyLabels())
selector := k8slabels.NewSelector().Add(
labelSetToRequirements(labels)...,
)
// TODO(caas): Fix to only delete cluster wide resources created by this controller.
tasks := []teardownResources{
k.deleteClusterRoleBindingsModelTeardown,
k.deleteClusterRolesModelTeardown,
k.deleteClusterScopeAPIExtensionResourcesModelTeardown,
k.deleteMutatingWebhookConfigurationsModelTeardown,
k.deleteValidatingWebhookConfigurationsModelTeardown,
k.deleteStorageClassesModelTeardown,
}
var subwg sync.WaitGroup
subwg.Add(len(tasks))
defer subwg.Wait()
for _, f := range tasks {
go f(ctx, selector, k.clock, &subwg, errChan)
}
}
type teardownResources func(
context.Context,
k8slabels.Selector,
jujuclock.Clock,
*sync.WaitGroup,
chan<- error,
)
func (k *kubernetesClient) deleteClusterRoleBindingsModelTeardown(
ctx context.Context,
selector k8slabels.Selector,
clk jujuclock.Clock,
wg *sync.WaitGroup,
errChan chan<- error,
) {
ensureResourcesDeletedFunc(ctx, selector, clk, wg, errChan,
k.deleteClusterRoleBindings, func(selector k8slabels.Selector) error {
_, err := k.listClusterRoleBindings(selector)
return err
},
)
}
func (k *kubernetesClient) deleteClusterRolesModelTeardown(
ctx context.Context,
selector k8slabels.Selector,
clk jujuclock.Clock,
wg *sync.WaitGroup,
errChan chan<- error,
) {
ensureResourcesDeletedFunc(ctx, selector, clk, wg, errChan,
k.deleteClusterRoles, func(selector k8slabels.Selector) error {
_, err := k.listClusterRoles(selector)
return err
},
)
}
func (k *kubernetesClient) deleteClusterScopeAPIExtensionResourcesModelTeardown(
ctx context.Context,
selector k8slabels.Selector,
clk jujuclock.Clock,
wg *sync.WaitGroup,
errChan chan<- error,
) {
defer wg.Done()
var subwg sync.WaitGroup
subwg.Add(2)
defer subwg.Wait()
selector = mergeSelectors(selector, lifecycleModelTeardownSelector)
// Delete CRs first then CRDs.
k.deleteClusterScopeCustomResourcesModelTeardown(ctx, selector, clk, &subwg, errChan)
k.deleteCustomResourceDefinitionsModelTeardown(ctx, selector, clk, &subwg, errChan)
}
func (k *kubernetesClient) deleteClusterScopeCustomResourcesModelTeardown(
ctx context.Context,
selector k8slabels.Selector,
clk jujuclock.Clock,
wg *sync.WaitGroup,
errChan chan<- error,
) {
getSelector := func(crd apiextensionsv1.CustomResourceDefinition) k8slabels.Selector {
if !isCRDScopeNamespaced(crd.Spec.Scope) {
// We only delete cluster scope CRs here, namespaced CRs are deleted by namespace destroy process.
return selector
}
return k8slabels.NewSelector()
}
ensureResourcesDeletedFunc(ctx, selector, clk, wg, errChan,
func(_ k8slabels.Selector) error {
return k.deleteCustomResources(getSelector)
},
func(_ k8slabels.Selector) error {
_, err := k.listCustomResources(getSelector)
return err
},
)
}
func (k *kubernetesClient) deleteCustomResourceDefinitionsModelTeardown(
ctx context.Context,
selector k8slabels.Selector,
clk jujuclock.Clock,
wg *sync.WaitGroup,
errChan chan<- error,
) {
ensureResourcesDeletedFunc(ctx, selector, clk, wg, errChan,
k.deleteCustomResourceDefinitions, func(selector k8slabels.Selector) error {
_, err := k.listCustomResourceDefinitions(selector)
return err
},
)
}
func (k *kubernetesClient) deleteMutatingWebhookConfigurationsModelTeardown(
ctx context.Context,
selector k8slabels.Selector,
clk jujuclock.Clock,
wg *sync.WaitGroup,
errChan chan<- error,
) {
ensureResourcesDeletedFunc(ctx, selector, clk, wg, errChan,
k.deleteMutatingWebhookConfigurations, func(selector k8slabels.Selector) error {
_, err := k.listMutatingWebhookConfigurations(selector)
return err
},
)
}
func (k *kubernetesClient) deleteValidatingWebhookConfigurationsModelTeardown(
ctx context.Context,
selector k8slabels.Selector,
clk jujuclock.Clock,
wg *sync.WaitGroup,
errChan chan<- error,
) {
ensureResourcesDeletedFunc(ctx, selector, clk, wg, errChan,
k.deleteValidatingWebhookConfigurations, func(selector k8slabels.Selector) error {
_, err := k.listValidatingWebhookConfigurations(selector)
return err
},
)
}
func (k *kubernetesClient) deleteStorageClassesModelTeardown(
ctx context.Context,
selector k8slabels.Selector,
clk jujuclock.Clock,
wg *sync.WaitGroup,
errChan chan<- error,
) {
ensureResourcesDeletedFunc(ctx, selector, clk, wg, errChan,
k.deleteStorageClasses, func(selector k8slabels.Selector) error {
_, err := k.ListStorageClasses(selector)
return err
},
)
}
type deleterChecker func(k8slabels.Selector) error
func ensureResourcesDeletedFunc(
ctx context.Context,
selector k8slabels.Selector,
clk jujuclock.Clock,
wg *sync.WaitGroup,
errChan chan<- error,
deleter, checker deleterChecker,
) {
defer wg.Done()
var err error
defer func() {
if err != nil {
select {
case errChan <- err:
default:
}
}
}()
if err = deleter(selector); err != nil {
if errors.IsNotFound(err) {
err = nil
}
return
}
interval := 1 * time.Second
ticker := clk.NewTimer(interval)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
err = errors.Trace(ctx.Err())
return
case <-ticker.Chan():
err = checker(selector)
if errors.IsNotFound(err) {
// Deleted already.
err = nil
return
}
if err != nil {
err = errors.Trace(err)
return
}
}
// Keep checking.
ticker.Reset(interval)
}
}
func (k *kubernetesClient) deleteNamespaceModelTeardown(ctx context.Context, wg *sync.WaitGroup, errChan chan<- error) {
defer wg.Done()
var err error
defer func() {
if err != nil {
select {
case errChan <- err:
default:
}
}
}()
var w watcher.NotifyWatcher
if w, err = k.WatchNamespace(); err != nil {
err = errors.Annotatef(err, "watching namespace %q", k.namespace)
return
}
defer w.Kill()
if err = k.deleteNamespace(); err != nil {
err = errors.Annotatef(err, "deleting model namespace %q", k.namespace)
return
}
for {
select {
case <-ctx.Done():
err = errors.Annotatef(ctx.Err(), "tearing down namespace %q", k.namespace)
return
case <-w.Changes():
// Ensures the namespace to be deleted - notfound error expected.
_, err = k.GetNamespace(k.namespace)
if errors.IsNotFound(err) {
// Namespace has been deleted.
err = nil
return
}
if err != nil {
err = errors.Trace(err)
return
}
logger.Debugf("namespace %q is still been terminating", k.namespace)
}
}
}