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controller.go
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controller.go
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package controller
import (
"fmt"
"log"
"time"
routev1 "github.com/openshift/api/route/v1"
"github.com/stakater/IngressMonitorController/pkg/callbacks"
"github.com/stakater/IngressMonitorController/pkg/config"
"github.com/stakater/IngressMonitorController/pkg/constants"
"github.com/stakater/IngressMonitorController/pkg/kube"
"github.com/stakater/IngressMonitorController/pkg/kube/wrappers"
"github.com/stakater/IngressMonitorController/pkg/models"
"github.com/stakater/IngressMonitorController/pkg/monitors"
"github.com/stakater/IngressMonitorController/pkg/util"
"k8s.io/api/extensions/v1beta1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
)
// MonitorController which can be used for monitoring ingresses
type MonitorController struct {
kubeClient kubernetes.Interface
namespace string
indexer cache.Indexer
queue workqueue.RateLimitingInterface
informer cache.Controller
monitorServices []monitors.MonitorServiceProxy
config config.Config
}
// NewMonitorController implements a controller to monitor ingresses and routes
func NewMonitorController(namespace string, kubeClient kubernetes.Interface, config config.Config, resource string, restClient rest.Interface) *MonitorController {
controller := &MonitorController{
kubeClient: kubeClient,
namespace: namespace,
config: config,
}
controller.monitorServices = setupMonitorServicesForProviders(config.Providers)
queue := workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter())
// Create the Ingress Watcher
ingressListWatcher := cache.NewListWatchFromClient(restClient, resource, namespace, fields.Everything())
indexer, informer := cache.NewIndexerInformer(ingressListWatcher, kube.ResourceMap[resource], time.Duration(config.ResyncPeriod)*time.Second, cache.ResourceEventHandlerFuncs{
AddFunc: controller.onResourceAdded,
UpdateFunc: controller.onResourceUpdated,
DeleteFunc: controller.onResourceDeleted,
}, cache.Indexers{})
controller.indexer = indexer
controller.informer = informer
controller.queue = queue
return controller
}
func setupMonitorServicesForProviders(providers []config.Provider) []monitors.MonitorServiceProxy {
if len(providers) < 1 {
log.Panic("Cannot Instantiate controller with no providers")
}
monitorServices := []monitors.MonitorServiceProxy{}
for index := 0; index < len(providers); index++ {
monitorServices = append(monitorServices, monitors.CreateMonitorService(&providers[index]))
}
return monitorServices
}
// Run method starts the controller
func (c *MonitorController) Run(threadiness int, stopCh chan struct{}) {
defer runtime.HandleCrash()
// Let the workers stop when we are done
defer c.queue.ShutDown()
log.Println("Starting Ingress Monitor controller")
go c.informer.Run(stopCh)
// Wait for all involved caches to be synced, before processing items from the queue is started
if !cache.WaitForCacheSync(stopCh, c.informer.HasSynced) {
runtime.HandleError(fmt.Errorf("Timed out waiting for caches to sync"))
return
}
for i := 0; i < threadiness; i++ {
go wait.Until(c.runWorker, time.Second, stopCh)
}
<-stopCh
log.Println("Stopping Ingress Monitor controller")
}
func (c *MonitorController) runWorker() {
for c.processNextItem() {
}
}
func (c *MonitorController) processNextItem() bool {
// Wait until there is a new item in the working queue
action, quit := c.queue.Get()
if quit {
return false
}
// Tell the queue that we are done with processing this key. This unblocks the key for other workers
// This allows safe parallel processing because two ingresses with the same key are never processed in
// parallel.
defer c.queue.Done(action)
// Invoke the method containing the business logic
err := action.(Action).handle(c)
// Handle the error if something went wrong during the execution of the business logic
c.handleErr(err, action)
return true
}
func (c *MonitorController) getMonitorName(rAFuncs callbacks.ResourceActionFuncs, resource interface{}) string {
annotations := rAFuncs.AnnotationFunc(resource)
if value, ok := annotations[constants.MonitorNameAnnotation]; ok {
return value
}
format, err := util.GetNameTemplateFormat(c.config.MonitorNameTemplate)
if err != nil {
log.Fatal("Failed to parse MonitorNameTemplate")
}
return fmt.Sprintf(format, rAFuncs.NameFunc(resource), rAFuncs.NamespaceFunc(resource))
}
func (c *MonitorController) getMonitorURL(resource interface{}) string {
if kube.IsRoute(resource) {
routeWrapper := wrappers.RouteWrapper{
Route: resource.(*routev1.Route),
Namespace: resource.(*routev1.Route).Namespace,
KubeClient: c.kubeClient,
}
return routeWrapper.GetURL()
}
ingressWrapper := wrappers.IngressWrapper{
Ingress: resource.(*v1beta1.Ingress),
Namespace: resource.(*v1beta1.Ingress).Namespace,
KubeClient: c.kubeClient,
}
return ingressWrapper.GetURL()
}
func (c *MonitorController) removeMonitorsIfExist(monitorName string) {
for index := 0; index < len(c.monitorServices); index++ {
c.removeMonitorIfExists(c.monitorServices[index], monitorName)
}
}
func (c *MonitorController) removeMonitorIfExists(monitorService monitors.MonitorServiceProxy, monitorName string) {
m, _ := monitorService.GetByName(monitorName)
if m != nil { // Monitor Exists
monitorService.Remove(*m) // Remove the monitor
} else {
log.Println("Cannot find monitor with name: " + monitorName)
}
}
func (c *MonitorController) createOrUpdateMonitors(monitorName string, oldMonitorName string, monitorURL string, annotations map[string]string) {
for index := 0; index < len(c.monitorServices); index++ {
monitorService := c.monitorServices[index]
c.createOrUpdateMonitor(monitorService, monitorName, oldMonitorName, monitorURL, annotations)
}
}
func (c *MonitorController) createOrUpdateMonitor(monitorService monitors.MonitorServiceProxy, monitorName string, oldMonitorName string, monitorURL string, annotations map[string]string) {
m, _ := monitorService.GetByName(oldMonitorName)
if m != nil { // Monitor Already Exists
log.Println("Monitor already exists for ingress: " + monitorName)
m.URL = monitorURL
m.Annotations = annotations
m.Name = monitorName
monitorService.Update(*m)
} else {
// Create a new monitor for this ingress
m := models.Monitor{
Name: monitorName,
URL: monitorURL,
Annotations: annotations,
}
monitorService.Add(m)
}
}
// handleErr checks if an error happened and makes sure we will retry later.
func (c *MonitorController) handleErr(err error, key interface{}) {
if err == nil {
// Forget about the #AddRateLimited history of the key on every successful synchronization.
// This ensures that future processing of updates for this key is not delayed because of
// an outdated error history.
c.queue.Forget(key)
return
}
// This controller retries 5 times if something goes wrong. After that, it stops trying.
if c.queue.NumRequeues(key) < 5 {
log.Printf("Error syncing ingress %v: %v", key, err)
// Re-enqueue the key rate limited. Based on the rate limiter on the
// queue and the re-enqueue history, the key will be processed later again.
c.queue.AddRateLimited(key)
return
}
c.queue.Forget(key)
// Report to an external entity that, even after several retries, we could not successfully process this key
runtime.HandleError(err)
log.Printf("Dropping ingress %q out of the queue: %v", key, err)
}
func (c *MonitorController) onResourceAdded(obj interface{}) {
c.queue.AddAfter(ResourceUpdatedAction{
resource: obj,
}, c.config.CreationDelay)
}
func (c *MonitorController) onResourceUpdated(old interface{}, new interface{}) {
c.queue.Add(ResourceUpdatedAction{
resource: new,
oldResource: old,
})
}
func (c *MonitorController) onResourceDeleted(obj interface{}) {
c.queue.Add(ResourceDeletedAction{
resource: obj,
})
}