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reconciler.go
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reconciler.go
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// Copyright 2022 TriggerMesh Inc.
// SPDX-License-Identifier: Apache-2.0
package trigger
import (
"context"
"encoding/json"
"errors"
"fmt"
"go.uber.org/zap"
corev1 "k8s.io/api/core/v1"
apierrs "k8s.io/apimachinery/pkg/api/errors"
corev1listers "k8s.io/client-go/listers/core/v1"
"knative.dev/pkg/controller"
"knative.dev/pkg/logging"
pkgreconciler "knative.dev/pkg/reconciler"
"knative.dev/pkg/resolver"
"github.com/triggermesh/brokers/pkg/status"
eventingv1alpha1 "github.com/triggermesh/triggermesh-core/pkg/apis/eventing/v1alpha1"
eventingv1alpha1listers "github.com/triggermesh/triggermesh-core/pkg/client/generated/listers/eventing/v1alpha1"
"github.com/triggermesh/triggermesh-core/pkg/reconciler/common"
)
type Reconciler struct {
// TODO duck brokers
rbLister eventingv1alpha1listers.RedisBrokerLister
mbLister eventingv1alpha1listers.MemoryBrokerLister
cmLister corev1listers.ConfigMapLister
uriResolver *resolver.URIResolver
}
func (r *Reconciler) ReconcileKind(ctx context.Context, t *eventingv1alpha1.Trigger) pkgreconciler.Event {
b, err := r.resolveBroker(ctx, t)
if err != nil {
return err
}
if err := r.resolveTarget(ctx, t); err != nil {
return err
}
if err := r.resolveDLS(ctx, t); err != nil {
return err
}
return r.reconcileStatusConfigMap(ctx, t, b)
}
func (r *Reconciler) resolveBroker(ctx context.Context, t *eventingv1alpha1.Trigger) (eventingv1alpha1.ReconcilableBroker, pkgreconciler.Event) {
// TODO duck
// TODO move to webhook
switch {
case t.Spec.Broker.Group == "":
t.Spec.Broker.Group = eventingv1alpha1.SchemeGroupVersion.Group
case t.Spec.Broker.Group != eventingv1alpha1.SchemeGroupVersion.Group:
return nil, controller.NewPermanentError(fmt.Errorf("not supported Broker Group %q", t.Spec.Broker.Group))
}
var rb *eventingv1alpha1.RedisBroker
if t.Spec.Broker.Kind == rb.GetGroupVersionKind().Kind {
return r.resolveRedisBroker(ctx, t)
}
var mb *eventingv1alpha1.MemoryBroker
if t.Spec.Broker.Kind != mb.GetGroupVersionKind().Kind {
return nil, controller.NewPermanentError(fmt.Errorf("not supported Broker Kind %q", t.Spec.Broker.Kind))
}
return r.resolveMemoryBroker(ctx, t)
}
func (r *Reconciler) resolveRedisBroker(ctx context.Context, t *eventingv1alpha1.Trigger) (eventingv1alpha1.ReconcilableBroker, pkgreconciler.Event) {
rb, err := r.rbLister.RedisBrokers(t.Namespace).Get(t.Spec.Broker.Name)
if err != nil {
if apierrs.IsNotFound(err) {
logging.FromContext(ctx).Errorw(fmt.Sprintf("Trigger %s/%s references non existing broker %q", t.Namespace, t.Name, t.Spec.Broker.Name))
t.Status.MarkBrokerFailed(common.ReasonBrokerDoesNotExist, "Broker %q does not exist", t.Spec.Broker.Name)
// No need to requeue, we will be notified when if broker is created.
return nil, controller.NewPermanentError(err)
}
t.Status.MarkBrokerFailed(common.ReasonFailedBrokerGet, "Failed to get broker %q : %s", t.Spec.Broker, err)
return nil, pkgreconciler.NewEvent(corev1.EventTypeWarning, common.ReasonFailedBrokerGet,
"Failed to get broker for trigger %s/%s: %w", t.Namespace, t.Name, err)
}
t.Status.PropagateBrokerCondition(rb.Status.GetTopLevelCondition())
// No need to requeue, we'll get requeued when broker changes status.
if !rb.IsReady() {
logging.FromContext(ctx).Errorw(fmt.Sprintf("Trigger %s/%s references non ready broker %q", t.Namespace, t.Name, t.Spec.Broker.Name))
}
return rb, nil
}
func (r *Reconciler) resolveMemoryBroker(ctx context.Context, t *eventingv1alpha1.Trigger) (eventingv1alpha1.ReconcilableBroker, pkgreconciler.Event) {
mb, err := r.mbLister.MemoryBrokers(t.Namespace).Get(t.Spec.Broker.Name)
if err != nil {
if apierrs.IsNotFound(err) {
logging.FromContext(ctx).Errorf("Trigger %s/%s references non existing broker %q", t.Namespace, t.Name, t.Spec.Broker.Name)
t.Status.MarkBrokerFailed(common.ReasonBrokerDoesNotExist, "Broker %q does not exist", t.Spec.Broker.Name)
// No need to requeue, we will be notified when broker is created.
return nil, controller.NewPermanentError(err)
}
t.Status.MarkBrokerFailed(common.ReasonFailedBrokerGet, "Failed to get broker %q : %s", t.Spec.Broker, err)
return nil, pkgreconciler.NewEvent(corev1.EventTypeWarning, common.ReasonFailedBrokerGet,
"Failed to get broker for trigger %s/%s: %w", t.Namespace, t.Name, err)
}
t.Status.PropagateBrokerCondition(mb.Status.GetTopLevelCondition())
// No need to requeue, we'll get requeued when broker changes status.
if !mb.IsReady() {
logging.FromContext(ctx).Errorw(fmt.Sprintf("Trigger %s/%s references non ready broker %q", t.Namespace, t.Name, t.Spec.Broker.Name))
}
return mb, nil
}
func (r *Reconciler) resolveTarget(ctx context.Context, t *eventingv1alpha1.Trigger) pkgreconciler.Event {
if t.Spec.Target.Ref != nil && t.Spec.Target.Ref.Namespace == "" {
// To call URIFromDestinationV1(ctx context.Context, dest v1.Destination, parent interface{}), dest.Ref must have a Namespace
// If Target.Ref.Namespace is nil, We will use the Namespace of Trigger as the Namespace of dest.Ref
t.Spec.Target.Ref.Namespace = t.Namespace
}
targetURI, err := r.uriResolver.URIFromDestinationV1(ctx, t.Spec.Target, t)
if err != nil {
logging.FromContext(ctx).Errorw("Unable to get the target's URI", zap.Error(err))
t.Status.MarkTargetResolvedFailed("Unable to get the target's URI", "%v", err)
t.Status.TargetURI = nil
return pkgreconciler.NewEvent(corev1.EventTypeWarning, common.ReasonFailedResolveReference,
"Failed to get target's URI: %w", err)
}
t.Status.TargetURI = targetURI
t.Status.MarkTargetResolvedSucceeded()
return nil
}
func (r *Reconciler) resolveDLS(ctx context.Context, t *eventingv1alpha1.Trigger) pkgreconciler.Event {
if t.Spec.Delivery == nil || t.Spec.Delivery.DeadLetterSink == nil {
t.Status.DeadLetterSinkURI = nil
t.Status.MarkDeadLetterSinkNotConfigured()
return nil
}
if t.Spec.Delivery.DeadLetterSink.Ref != nil && t.Spec.Delivery.DeadLetterSink.Ref.Namespace == "" {
// To call URIFromDestinationV1(ctx context.Context, dest v1.Destination, parent interface{}), dest.Ref must have a Namespace
// If Target.Ref.Namespace is nil, We will use the Namespace of Trigger as the Namespace of dest.Ref
t.Spec.Delivery.DeadLetterSink.Ref.Namespace = t.Namespace
}
dlsURI, err := r.uriResolver.URIFromDestinationV1(ctx, *t.Spec.Delivery.DeadLetterSink, t)
if err != nil {
logging.FromContext(ctx).Errorw("Unable to get the dead letter sink's URI", zap.Error(err))
t.Status.MarkDeadLetterSinkResolvedFailed("Unable to get the dead letter sink's URI", "%v", err)
t.Status.TargetURI = nil
return pkgreconciler.NewEvent(corev1.EventTypeWarning, common.ReasonFailedResolveReference,
"Failed to get dead letter sink's URI: %w", err)
}
t.Status.DeadLetterSinkURI = dlsURI
t.Status.MarkDeadLetterSinkResolvedSucceeded()
return nil
}
func (r *Reconciler) reconcileStatusConfigMap(ctx context.Context, t *eventingv1alpha1.Trigger, b eventingv1alpha1.ReconcilableBroker) pkgreconciler.Event {
configMapName := common.GetBrokerConfigMapName(b)
cm, err := r.cmLister.ConfigMaps(t.Namespace).Get(configMapName)
if err != nil {
if apierrs.IsNotFound(err) {
logging.FromContext(ctx).Errorf("Trigger %s/%s could not find the Status ConfigMap for the referenced broker %q", t.Namespace, t.Name, configMapName)
t.Status.MarkStatusConfigMapFailed(common.ReasonStatusConfigMapDoesNotExist, "Status ConfigMap %q does not exist", configMapName)
// No need to requeue, we will be notified when the status ConfigMap is created.
return controller.NewPermanentError(err)
}
t.Status.MarkStatusConfigMapFailed(common.ReasonStatusConfigMapGetFailed, "Failed to get ConfigMap for broker %q : %s", configMapName, err)
return pkgreconciler.NewEvent(corev1.EventTypeWarning, common.ReasonStatusConfigMapGetFailed,
"Failed to get ConfigMap for broker %s: %w", configMapName, err)
}
cmst, ok := cm.Data[common.ConfigMapStatusKey]
if !ok {
errmsg := fmt.Sprintf("ConfigMap %q does not contain key %q", configMapName, common.ConfigMapStatusKey)
t.Status.MarkStatusConfigMapFailed(common.ReasonStatusConfigMapReadFailed, errmsg)
// No need to requeue, we will be notified when the status ConfigMap is updated.
return controller.NewPermanentError(errors.New(errmsg))
}
sts := map[string]status.Status{}
if err := json.Unmarshal([]byte(cmst), &sts); err != nil {
errmsg := fmt.Sprintf("ConfigMap %s/%s could not be unmarshalled as a status: %v", configMapName, common.ConfigMapStatusKey, err)
t.Status.MarkStatusConfigMapFailed(common.ReasonStatusConfigMapReadFailed, errmsg)
// No need to requeue, we will be notified when the status ConfigMap is updated.
return controller.NewPermanentError(errors.New(errmsg))
}
return r.summarizeStatus(t, sts)
}
func (r *Reconciler) summarizeStatus(t *eventingv1alpha1.Trigger, sts map[string]status.Status) pkgreconciler.Event {
// Iterate all nodes and take note of the status for this trigger
var temp status.SubscriptionStatusChoice
for instance, st := range sts {
subs, ok := st.Subscriptions[t.Name]
if !ok {
continue
}
switch subs.Status {
case status.SubscriptionStatusFailed:
// If one instance reports failure, consider the trigger failed.
errmsg := fmt.Sprintf("subscription failure reported by %s", instance)
t.Status.MarkStatusConfigMapFailed(common.ReasonStatusSubscriptionFailed, errmsg)
return controller.NewPermanentError(errors.New(errmsg))
case status.SubscriptionStatusComplete:
// If one instance reports complete, consider the trigger completed.
// Note: this is eventually consistent, some nodes might be still sending events!
t.Status.MarkStatusConfigMapSucceeded(common.ReasonStatusSubscriptionCompleted, fmt.Sprintf("subscription failure reported by %s", instance))
return nil
case status.SubscriptionStatusReady:
// Running state takes precedence over ready state.
if temp != status.SubscriptionStatusRunning {
temp = status.SubscriptionStatusReady
}
case status.SubscriptionStatusRunning:
if temp != status.SubscriptionStatusRunning {
temp = status.SubscriptionStatusRunning
}
}
}
switch temp {
case status.SubscriptionStatusReady:
t.Status.MarkStatusConfigMapSucceeded(common.ReasonStatusSubscriptionReady, "subscription ready to dispatch events")
case status.SubscriptionStatusRunning:
t.Status.MarkStatusConfigMapSucceeded(common.ReasonStatusSubscriptionRunning, "subscription running")
default:
t.Status.MarkStatusConfigMapSucceeded(common.ReasonStatusSubscriptionUnknown, "no subscription status information")
}
return nil
}