123 lines
3.8 KiB
Go
123 lines
3.8 KiB
Go
/*
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Copyright 2018 the Heptio Ark contributors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package restic
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import (
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"context"
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"sync"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/tools/cache"
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arkv1api "github.com/heptio/ark/pkg/apis/ark/v1"
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arkv1client "github.com/heptio/ark/pkg/generated/clientset/versioned/typed/ark/v1"
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arkv1informers "github.com/heptio/ark/pkg/generated/informers/externalversions/ark/v1"
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arkv1listers "github.com/heptio/ark/pkg/generated/listers/ark/v1"
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)
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// repositoryEnsurer ensures that Ark restic repositories are created and ready.
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type repositoryEnsurer struct {
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repoLister arkv1listers.ResticRepositoryLister
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repoClient arkv1client.ResticRepositoriesGetter
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readyChansLock sync.Mutex
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readyChans map[string]chan *arkv1api.ResticRepository
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}
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func newRepositoryEnsurer(repoInformer arkv1informers.ResticRepositoryInformer, repoClient arkv1client.ResticRepositoriesGetter, log logrus.FieldLogger) *repositoryEnsurer {
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r := &repositoryEnsurer{
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repoLister: repoInformer.Lister(),
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repoClient: repoClient,
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readyChans: make(map[string]chan *arkv1api.ResticRepository),
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}
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repoInformer.Informer().AddEventHandler(
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cache.ResourceEventHandlerFuncs{
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UpdateFunc: func(old, upd interface{}) {
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oldObj := old.(*arkv1api.ResticRepository)
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newObj := upd.(*arkv1api.ResticRepository)
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if oldObj.Status.Phase != arkv1api.ResticRepositoryPhaseReady && newObj.Status.Phase == arkv1api.ResticRepositoryPhaseReady {
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r.readyChansLock.Lock()
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defer r.readyChansLock.Unlock()
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readyChan, ok := r.readyChans[newObj.Name]
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if !ok {
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log.Errorf("No ready channel found for repository %s/%s", newObj.Namespace, newObj.Name)
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return
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}
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readyChan <- newObj
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delete(r.readyChans, newObj.Name)
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}
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},
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},
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)
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return r
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}
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func (r *repositoryEnsurer) EnsureRepo(ctx context.Context, namespace, name string) (*arkv1api.ResticRepository, error) {
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if repo, err := r.repoLister.ResticRepositories(namespace).Get(name); err != nil && !apierrors.IsNotFound(err) {
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return nil, errors.WithStack(err)
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} else if err == nil {
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if repo.Status.Phase != arkv1api.ResticRepositoryPhaseReady {
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return nil, errors.New("restic repository is not ready")
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}
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return repo, nil
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}
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// if we're here, it means we got an IsNotFound error, meaning we need to create a new
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// repo and wait for it to be ready
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repo := &arkv1api.ResticRepository{
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ObjectMeta: metav1.ObjectMeta{
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Namespace: namespace,
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Name: name,
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},
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Spec: arkv1api.ResticRepositorySpec{
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MaintenanceFrequency: metav1.Duration{Duration: DefaultMaintenanceFrequency},
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},
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}
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readyChan := r.getReadyChan(name)
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defer close(readyChan)
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if _, err := r.repoClient.ResticRepositories(namespace).Create(repo); err != nil {
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return nil, errors.Wrapf(err, "unable to create restic repository resource")
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}
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select {
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case <-ctx.Done():
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return nil, errors.New("timed out waiting for restic repository to become ready")
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case res := <-readyChan:
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return res, nil
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}
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}
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func (r *repositoryEnsurer) getReadyChan(name string) chan *arkv1api.ResticRepository {
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r.readyChansLock.Lock()
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defer r.readyChansLock.Unlock()
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r.readyChans[name] = make(chan *arkv1api.ResticRepository)
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return r.readyChans[name]
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}
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