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operator.go
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operator.go
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//
// DISCLAIMER
//
// Copyright 2016-2024 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
//
package operator
import (
"sync"
"time"
"github.com/prometheus/client_golang/prometheus"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"github.com/arangodb/kube-arangodb/pkg/operatorV2/operation"
"github.com/arangodb/kube-arangodb/pkg/util/errors"
)
// Starter interface used by Operator to start new GoRoutines
type Starter interface {
Start(stopCh <-chan struct{})
}
// Operator interface for operator core functionality
type Operator interface {
// Define prometheus collector interface
prometheus.Collector
Name() string
Namespace() string
Image() string
Start(threadiness int, stopCh <-chan struct{}) error
RegisterInformer(informer cache.SharedIndexInformer, group, version, kind string, filters ...InformerFilter) error
RegisterStarter(starter Starter) error
RegisterHandler(handler Handler) error
EnqueueItem(item operation.Item)
ProcessItem(item operation.Item) error
}
// NewOperator creates new operator
func NewOperator(name, namespace, image string) Operator {
o := &operator{
name: name,
namespace: namespace,
image: image,
workqueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), name),
}
// Declaration of prometheus interface
o.prometheusMetrics = newCollector(o)
return o
}
type operator struct {
lock sync.Mutex
started bool
name string
namespace string
image string
informers []cache.SharedInformer
starters []Starter
handlers []Handler
workqueue workqueue.RateLimitingInterface
// Implement prometheus collector
*prometheusMetrics
}
func (o *operator) Namespace() string {
return o.namespace
}
func (o *operator) Name() string {
return o.name
}
func (o *operator) Image() string {
return o.image
}
func (o *operator) ProcessItem(item operation.Item) error {
{
o.lock.Lock()
defer o.lock.Unlock()
if !o.started {
return errors.Errorf("operator is not started started")
}
}
return o.processItem(item)
}
func (o *operator) RegisterHandler(handler Handler) error {
o.lock.Lock()
defer o.lock.Unlock()
if o.started {
return errors.Errorf("operator already started")
}
for _, registeredHandlers := range o.handlers {
if registeredHandlers == handler {
return errors.Errorf("handler already registered")
}
}
o.handlers = append(o.handlers, handler)
return nil
}
func (o *operator) RegisterStarter(starter Starter) error {
o.lock.Lock()
defer o.lock.Unlock()
if o.started {
return errors.Errorf("operator already started")
}
for _, registeredStarter := range o.starters {
if registeredStarter == starter {
return errors.Errorf("starter already registered")
}
}
o.starters = append(o.starters, starter)
return nil
}
func (o *operator) EnqueueItem(item operation.Item) {
o.workqueue.Add(item.String())
}
func (o *operator) RegisterInformer(informer cache.SharedIndexInformer, group, version, kind string, filters ...InformerFilter) error {
o.lock.Lock()
defer o.lock.Unlock()
if o.started {
return errors.Errorf("operator already started")
}
for _, registeredInformer := range o.informers {
if registeredInformer == informer {
return errors.Errorf("informer already registered")
}
}
o.informers = append(o.informers, informer)
informer.AddEventHandler(newResourceEventHandler(o, group, version, kind, informerFilterMerge(filters...)))
return nil
}
func (o *operator) Start(threadiness int, stopCh <-chan struct{}) error {
o.lock.Lock()
defer o.lock.Unlock()
if o.started {
return errors.Errorf("operator already started")
}
o.started = true
return o.start(threadiness, stopCh)
}
func (o *operator) start(threadiness int, stopCh <-chan struct{}) error {
// Execute pre checks
logger.Info("Executing Lifecycle PreStart")
for _, handler := range o.handlers {
if err := ExecLifecyclePreStart(handler); err != nil {
return err
}
}
logger.Info("Starting informers")
for _, starter := range o.starters {
starter.Start(stopCh)
}
if err := o.waitForCacheSync(stopCh); err != nil {
return err
}
logger.Info("Starting workers")
for i := 0; i < threadiness; i++ {
go wait.Until(o.worker, time.Second, stopCh)
}
logger.Info("Operator started")
return nil
}
func (o *operator) waitForCacheSync(stopCh <-chan struct{}) error {
cacheSync := make([]cache.InformerSynced, len(o.informers))
for id, informer := range o.informers {
cacheSync[id] = informer.HasSynced
}
if ok := cache.WaitForCacheSync(stopCh, cacheSync...); !ok {
return errors.Errorf("cache can not sync")
}
return nil
}