forked from arangodb/kube-arangodb
/
operator_local_storage.go
218 lines (193 loc) · 7.25 KB
/
operator_local_storage.go
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//
// DISCLAIMER
//
// Copyright 2018 ArangoDB GmbH, Cologne, Germany
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Copyright holder is ArangoDB GmbH, Cologne, Germany
//
// Author Ewout Prangsma
//
package operator
import (
"fmt"
"github.com/pkg/errors"
kwatch "k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/tools/cache"
api "github.com/arangodb/kube-arangodb/pkg/apis/storage/v1alpha"
"github.com/arangodb/kube-arangodb/pkg/metrics"
"github.com/arangodb/kube-arangodb/pkg/storage"
"github.com/arangodb/kube-arangodb/pkg/util/k8sutil"
)
var (
localStoragesCreated = metrics.MustRegisterCounter("controller", "local_storages_created", "Number of local storages that have been created")
localStoragesDeleted = metrics.MustRegisterCounter("controller", "local_storages_deleted", "Number of local storages that have been deleted")
localStoragesFailed = metrics.MustRegisterCounter("controller", "local_storages_failed", "Number of local storages that have failed")
localStoragesModified = metrics.MustRegisterCounter("controller", "local_storages_modified", "Number of local storage modifications")
localStoragesCurrent = metrics.MustRegisterGauge("controller", "local_storages", "Number of local storages currently being managed")
)
// run the local storages part of the operator.
// This registers a listener and waits until the process stops.
func (o *Operator) runLocalStorages(stop <-chan struct{}) {
rw := k8sutil.NewResourceWatcher(
o.log,
o.Dependencies.CRCli.StorageV1alpha().RESTClient(),
api.ArangoLocalStorageResourcePlural,
"", //o.Config.Namespace,
&api.ArangoLocalStorage{},
cache.ResourceEventHandlerFuncs{
AddFunc: o.onAddArangoLocalStorage,
UpdateFunc: o.onUpdateArangoLocalStorage,
DeleteFunc: o.onDeleteArangoLocalStorage,
})
o.Dependencies.StorageProbe.SetReady()
rw.Run(stop)
}
// onAddArangoLocalStorage local storage addition callback
func (o *Operator) onAddArangoLocalStorage(obj interface{}) {
o.Dependencies.LivenessProbe.Lock()
defer o.Dependencies.LivenessProbe.Unlock()
apiObject := obj.(*api.ArangoLocalStorage)
o.log.Debug().
Str("name", apiObject.GetObjectMeta().GetName()).
Msg("ArangoLocalStorage added")
o.syncArangoLocalStorage(apiObject)
}
// onUpdateArangoLocalStorage local storage update callback
func (o *Operator) onUpdateArangoLocalStorage(oldObj, newObj interface{}) {
o.Dependencies.LivenessProbe.Lock()
defer o.Dependencies.LivenessProbe.Unlock()
apiObject := newObj.(*api.ArangoLocalStorage)
o.log.Debug().
Str("name", apiObject.GetObjectMeta().GetName()).
Msg("ArangoLocalStorage updated")
o.syncArangoLocalStorage(apiObject)
}
// onDeleteArangoLocalStorage local storage delete callback
func (o *Operator) onDeleteArangoLocalStorage(obj interface{}) {
o.Dependencies.LivenessProbe.Lock()
defer o.Dependencies.LivenessProbe.Unlock()
log := o.log
apiObject, ok := obj.(*api.ArangoLocalStorage)
if !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
log.Error().Interface("event-object", obj).Msg("unknown object from ArangoLocalStorage delete event")
return
}
apiObject, ok = tombstone.Obj.(*api.ArangoLocalStorage)
if !ok {
log.Error().Interface("event-object", obj).Msg("Tombstone contained object that is not an ArangoLocalStorage")
return
}
}
log.Debug().
Str("name", apiObject.GetObjectMeta().GetName()).
Msg("ArangoLocalStorage deleted")
ev := &Event{
Type: kwatch.Deleted,
LocalStorage: apiObject,
}
// pt.start()
err := o.handleLocalStorageEvent(ev)
if err != nil {
log.Warn().Err(err).Msg("Failed to handle event")
}
//pt.stop()
}
// syncArangoLocalStorage synchronizes the given local storage.
func (o *Operator) syncArangoLocalStorage(apiObject *api.ArangoLocalStorage) {
ev := &Event{
Type: kwatch.Added,
LocalStorage: apiObject,
}
// re-watch or restart could give ADD event.
// If for an ADD event the cluster spec is invalid then it is not added to the local cache
// so modifying that local storage will result in another ADD event
if _, ok := o.localStorages[apiObject.Name]; ok {
ev.Type = kwatch.Modified
}
//pt.start()
err := o.handleLocalStorageEvent(ev)
if err != nil {
o.log.Warn().Err(err).Msg("Failed to handle event")
}
//pt.stop()
}
// handleLocalStorageEvent processed the given event.
func (o *Operator) handleLocalStorageEvent(event *Event) error {
apiObject := event.LocalStorage
if apiObject.Status.State.IsFailed() {
localStoragesFailed.Inc()
if event.Type == kwatch.Deleted {
delete(o.localStorages, apiObject.Name)
return nil
}
return maskAny(fmt.Errorf("ignore failed local storage (%s). Please delete its CR", apiObject.Name))
}
// Fill in defaults
apiObject.Spec.SetDefaults(apiObject.GetName())
// Validate local storage spec
if err := apiObject.Spec.Validate(); err != nil {
return maskAny(errors.Wrapf(err, "invalid local storage spec. please fix the following problem with the local storage spec: %v", err))
}
switch event.Type {
case kwatch.Added:
if _, ok := o.localStorages[apiObject.Name]; ok {
return maskAny(fmt.Errorf("unsafe state. local storage (%s) was created before but we received event (%s)", apiObject.Name, event.Type))
}
cfg, deps := o.makeLocalStorageConfigAndDeps(apiObject)
stg, err := storage.New(cfg, deps, apiObject)
if err != nil {
return maskAny(fmt.Errorf("failed to create local storage: %s", err))
}
o.localStorages[apiObject.Name] = stg
localStoragesCreated.Inc()
localStoragesCurrent.Set(float64(len(o.localStorages)))
case kwatch.Modified:
stg, ok := o.localStorages[apiObject.Name]
if !ok {
return maskAny(fmt.Errorf("unsafe state. local storage (%s) was never created but we received event (%s)", apiObject.Name, event.Type))
}
stg.Update(apiObject)
localStoragesModified.Inc()
case kwatch.Deleted:
stg, ok := o.localStorages[apiObject.Name]
if !ok {
return maskAny(fmt.Errorf("unsafe state. local storage (%s) was never created but we received event (%s)", apiObject.Name, event.Type))
}
stg.Delete()
delete(o.localStorages, apiObject.Name)
localStoragesDeleted.Inc()
localStoragesCurrent.Set(float64(len(o.localStorages)))
}
return nil
}
// makeLocalStorageConfigAndDeps creates a Config & Dependencies object for a new LocalStorage.
func (o *Operator) makeLocalStorageConfigAndDeps(apiObject *api.ArangoLocalStorage) (storage.Config, storage.Dependencies) {
cfg := storage.Config{
Namespace: o.Config.Namespace,
PodName: o.Config.PodName,
ServiceAccount: o.Config.ServiceAccount,
}
deps := storage.Dependencies{
Log: o.Dependencies.LogService.MustGetLogger("storage").With().
Str("localStorage", apiObject.GetName()).
Logger(),
KubeCli: o.Dependencies.KubeCli,
StorageCRCli: o.Dependencies.CRCli,
EventRecorder: o.Dependencies.EventRecorder,
}
return cfg, deps
}