/
controller.go
299 lines (262 loc) · 8.5 KB
/
controller.go
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package controller
import (
"fmt"
"sync"
"time"
"github.com/google/go-cmp/cmp"
flaggerv1 "github.com/weaveworks/flagger/pkg/apis/flagger/v1alpha3"
clientset "github.com/weaveworks/flagger/pkg/client/clientset/versioned"
flaggerscheme "github.com/weaveworks/flagger/pkg/client/clientset/versioned/scheme"
flaggerinformers "github.com/weaveworks/flagger/pkg/client/informers/externalversions/flagger/v1alpha3"
flaggerlisters "github.com/weaveworks/flagger/pkg/client/listers/flagger/v1alpha3"
"github.com/weaveworks/flagger/pkg/notifier"
"go.uber.org/zap"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
)
const controllerAgentName = "flagger"
// Controller is managing the canary objects and schedules canary deployments
type Controller struct {
kubeClient kubernetes.Interface
istioClient clientset.Interface
flaggerClient clientset.Interface
flaggerLister flaggerlisters.CanaryLister
flaggerSynced cache.InformerSynced
flaggerWindow time.Duration
workqueue workqueue.RateLimitingInterface
eventRecorder record.EventRecorder
logger *zap.SugaredLogger
canaries *sync.Map
jobs map[string]CanaryJob
deployer CanaryDeployer
observer CanaryObserver
recorder CanaryRecorder
notifier *notifier.Slack
meshProvider string
}
func NewController(
kubeClient kubernetes.Interface,
istioClient clientset.Interface,
flaggerClient clientset.Interface,
flaggerInformer flaggerinformers.CanaryInformer,
flaggerWindow time.Duration,
metricServer string,
logger *zap.SugaredLogger,
notifier *notifier.Slack,
meshProvider string,
) *Controller {
logger.Debug("Creating event broadcaster")
flaggerscheme.AddToScheme(scheme.Scheme)
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(logger.Named("event-broadcaster").Debugf)
eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{
Interface: kubeClient.CoreV1().Events(""),
})
eventRecorder := eventBroadcaster.NewRecorder(
scheme.Scheme, corev1.EventSource{Component: controllerAgentName})
deployer := CanaryDeployer{
logger: logger,
kubeClient: kubeClient,
flaggerClient: flaggerClient,
configTracker: ConfigTracker{
logger: logger,
kubeClient: kubeClient,
flaggerClient: flaggerClient,
},
}
observer := CanaryObserver{
metricsServer: metricServer,
}
recorder := NewCanaryRecorder(true)
ctrl := &Controller{
kubeClient: kubeClient,
istioClient: istioClient,
flaggerClient: flaggerClient,
flaggerLister: flaggerInformer.Lister(),
flaggerSynced: flaggerInformer.Informer().HasSynced,
workqueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), controllerAgentName),
eventRecorder: eventRecorder,
logger: logger,
canaries: new(sync.Map),
jobs: map[string]CanaryJob{},
flaggerWindow: flaggerWindow,
deployer: deployer,
observer: observer,
recorder: recorder,
notifier: notifier,
meshProvider: meshProvider,
}
flaggerInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: ctrl.enqueue,
UpdateFunc: func(old, new interface{}) {
oldRoll, ok := checkCustomResourceType(old, logger)
if !ok {
return
}
newRoll, ok := checkCustomResourceType(new, logger)
if !ok {
return
}
if diff := cmp.Diff(newRoll.Spec, oldRoll.Spec); diff != "" {
ctrl.logger.Debugf("Diff detected %s.%s %s", oldRoll.Name, oldRoll.Namespace, diff)
ctrl.enqueue(new)
}
},
DeleteFunc: func(old interface{}) {
r, ok := checkCustomResourceType(old, logger)
if ok {
ctrl.logger.Infof("Deleting %s.%s from cache", r.Name, r.Namespace)
ctrl.canaries.Delete(fmt.Sprintf("%s.%s", r.Name, r.Namespace))
}
},
})
return ctrl
}
// Run starts the K8s workers and the canary scheduler
func (c *Controller) Run(threadiness int, stopCh <-chan struct{}) error {
defer utilruntime.HandleCrash()
defer c.workqueue.ShutDown()
c.logger.Info("Starting operator")
for i := 0; i < threadiness; i++ {
go wait.Until(func() {
for c.processNextWorkItem() {
}
}, time.Second, stopCh)
}
c.logger.Info("Started operator workers")
tickChan := time.NewTicker(c.flaggerWindow).C
for {
select {
case <-tickChan:
c.scheduleCanaries()
case <-stopCh:
c.logger.Info("Shutting down operator workers")
return nil
}
}
}
func (c *Controller) processNextWorkItem() bool {
obj, shutdown := c.workqueue.Get()
if shutdown {
return false
}
err := func(obj interface{}) error {
defer c.workqueue.Done(obj)
var key string
var ok bool
if key, ok = obj.(string); !ok {
c.workqueue.Forget(obj)
utilruntime.HandleError(fmt.Errorf("expected string in workqueue but got %#v", obj))
return nil
}
// Run the syncHandler, passing it the namespace/name string of the
// Foo resource to be synced.
if err := c.syncHandler(key); err != nil {
return fmt.Errorf("error syncing '%s': %s", key, err.Error())
}
// Finally, if no error occurs we Forget this item so it does not
// get queued again until another change happens.
c.workqueue.Forget(obj)
return nil
}(obj)
if err != nil {
utilruntime.HandleError(err)
return true
}
return true
}
func (c *Controller) syncHandler(key string) error {
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
utilruntime.HandleError(fmt.Errorf("invalid resource key: %s", key))
return nil
}
cd, err := c.flaggerLister.Canaries(namespace).Get(name)
if errors.IsNotFound(err) {
utilruntime.HandleError(fmt.Errorf("'%s' in work queue no longer exists", key))
return nil
}
c.canaries.Store(fmt.Sprintf("%s.%s", cd.Name, cd.Namespace), cd)
//if cd.Spec.TargetRef.Kind == "Deployment" {
// err = c.bootstrapDeployment(cd)
// if err != nil {
// c.logger.Warnf("%s.%s bootstrap error %v", cd.Name, cd.Namespace, err)
// return err
// }
//}
c.logger.Infof("Synced %s", key)
return nil
}
func (c *Controller) enqueue(obj interface{}) {
var key string
var err error
if key, err = cache.MetaNamespaceKeyFunc(obj); err != nil {
utilruntime.HandleError(err)
return
}
c.workqueue.AddRateLimited(key)
}
func checkCustomResourceType(obj interface{}, logger *zap.SugaredLogger) (flaggerv1.Canary, bool) {
var roll *flaggerv1.Canary
var ok bool
if roll, ok = obj.(*flaggerv1.Canary); !ok {
logger.Errorf("Event Watch received an invalid object: %#v", obj)
return flaggerv1.Canary{}, false
}
return *roll, true
}
func (c *Controller) recordEventInfof(r *flaggerv1.Canary, template string, args ...interface{}) {
c.logger.With("canary", fmt.Sprintf("%s.%s", r.Name, r.Namespace)).Infof(template, args...)
c.eventRecorder.Event(r, corev1.EventTypeNormal, "Synced", fmt.Sprintf(template, args...))
}
func (c *Controller) recordEventErrorf(r *flaggerv1.Canary, template string, args ...interface{}) {
c.logger.With("canary", fmt.Sprintf("%s.%s", r.Name, r.Namespace)).Errorf(template, args...)
c.eventRecorder.Event(r, corev1.EventTypeWarning, "Synced", fmt.Sprintf(template, args...))
}
func (c *Controller) recordEventWarningf(r *flaggerv1.Canary, template string, args ...interface{}) {
c.logger.With("canary", fmt.Sprintf("%s.%s", r.Name, r.Namespace)).Infof(template, args...)
c.eventRecorder.Event(r, corev1.EventTypeWarning, "Synced", fmt.Sprintf(template, args...))
}
func (c *Controller) sendNotification(cd *flaggerv1.Canary, message string, metadata bool, warn bool) {
if c.notifier == nil {
return
}
var fields []notifier.SlackField
if metadata {
fields = append(fields,
notifier.SlackField{
Title: "Target",
Value: fmt.Sprintf("%s/%s.%s", cd.Spec.TargetRef.Kind, cd.Spec.TargetRef.Name, cd.Namespace),
},
notifier.SlackField{
Title: "Traffic routing",
Value: fmt.Sprintf("Weight step: %v max: %v",
cd.Spec.CanaryAnalysis.StepWeight,
cd.Spec.CanaryAnalysis.MaxWeight),
},
notifier.SlackField{
Title: "Failed checks threshold",
Value: fmt.Sprintf("%v", cd.Spec.CanaryAnalysis.Threshold),
},
notifier.SlackField{
Title: "Progress deadline",
Value: fmt.Sprintf("%vs", cd.GetProgressDeadlineSeconds()),
},
)
}
err := c.notifier.Post(cd.Name, cd.Namespace, message, fields, warn)
if err != nil {
c.logger.Error(err)
}
}
func int32p(i int32) *int32 {
return &i
}