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listener_synthesizer.go
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listener_synthesizer.go
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package lattice
import (
"context"
"errors"
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-application-networking-k8s/pkg/model/core"
model "github.com/aws/aws-application-networking-k8s/pkg/model/lattice"
"github.com/aws/aws-application-networking-k8s/pkg/utils/gwlog"
)
type listenerSynthesizer struct {
log gwlog.Logger
listenerMgr ListenerManager
stack core.Stack
}
func NewListenerSynthesizer(
log gwlog.Logger,
ListenerManager ListenerManager,
stack core.Stack,
) *listenerSynthesizer {
return &listenerSynthesizer{
log: log,
listenerMgr: ListenerManager,
stack: stack,
}
}
func (l *listenerSynthesizer) Synthesize(ctx context.Context) error {
var stackListeners []*model.Listener
err := l.stack.ListResources(&stackListeners)
if err != nil {
return err
}
var listenerErr error
for _, listener := range stackListeners {
svc := &model.Service{}
err := l.stack.GetResource(listener.Spec.StackServiceId, svc)
if err != nil {
return err
}
status, err := l.listenerMgr.Upsert(ctx, listener, svc)
if err != nil {
listenerErr = errors.Join(listenerErr,
fmt.Errorf("failed ListenerManager.Upsert %s-%s due to err %s",
listener.Spec.K8SRouteName, listener.Spec.K8SRouteNamespace, err))
continue
}
listener.Status = &status
}
if listenerErr != nil {
return listenerErr
}
// All deletions happen here, we fetch all listeners for NON-deleted
// services, since service deletion will delete its listeners
latticeListenersAsModel, err := l.getLatticeListenersAsModels(ctx)
if err != nil {
return err
}
for _, latticeListenerAsModel := range latticeListenersAsModel {
if l.shouldDelete(latticeListenerAsModel, stackListeners) {
err = l.listenerMgr.Delete(ctx, latticeListenerAsModel)
if err != nil {
l.log.Infof("Failed ListenerManager.Delete %s due to %s", latticeListenerAsModel.Status.Id, err)
}
}
}
return nil
}
func (l *listenerSynthesizer) shouldDelete(listenerToFind *model.Listener, stackListeners []*model.Listener) bool {
for _, candidate := range stackListeners {
if candidate.Spec.Port == listenerToFind.Spec.Port && candidate.Spec.Protocol == listenerToFind.Spec.Protocol {
// found a match, do not delete
return false
}
}
// there is no matching listener
return true
}
// retrieves all the listeners for all the non-deleted services currently in the stack
func (l *listenerSynthesizer) getLatticeListenersAsModels(ctx context.Context) ([]*model.Listener, error) {
var latticeListenersAsModel []*model.Listener
var modelSvcs []*model.Service
err := l.stack.ListResources(&modelSvcs)
if err != nil {
return latticeListenersAsModel, err
}
// get the listeners for each service
for _, modelSvc := range modelSvcs {
if modelSvc.IsDeleted {
l.log.Debugf("Ignoring deleted service %s", modelSvc.LatticeServiceName())
continue
}
listenerSummaries, err := l.listenerMgr.List(ctx, modelSvc.Status.Id)
if err != nil {
l.log.Infof("Ignoring error when listing listeners %s", err)
continue
}
for _, latticeListener := range listenerSummaries {
spec := model.ListenerSpec{
StackServiceId: modelSvc.ID(),
Port: aws.Int64Value(latticeListener.Port),
Protocol: aws.StringValue(latticeListener.Protocol),
}
status := model.ListenerStatus{
Name: aws.StringValue(latticeListener.Name),
ListenerArn: aws.StringValue(latticeListener.Arn),
Id: aws.StringValue(latticeListener.Id),
ServiceId: modelSvc.Status.Id,
}
latticeListenersAsModel = append(latticeListenersAsModel, &model.Listener{
Spec: spec,
Status: &status,
})
}
}
return latticeListenersAsModel, nil
}
func (l *listenerSynthesizer) PostSynthesize(ctx context.Context) error {
// nothing to do here
return nil
}