/
event_collector.go
89 lines (77 loc) · 2.79 KB
/
event_collector.go
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package eventcollector
import (
"context"
"encoding/json"
"fmt"
"github.com/Shopify/sarama"
"github.com/go-logr/logr"
"github.com/resmoio/kubernetes-event-exporter/pkg/kube"
policyv1 "open-cluster-management.io/governance-policy-propagator/api/v1"
ctrl "sigs.k8s.io/controller-runtime"
eventprocessor "github.com/stolostron/multicluster-global-hub/manager/pkg/eventcollector/processor"
"github.com/stolostron/multicluster-global-hub/pkg/transport"
"github.com/stolostron/multicluster-global-hub/pkg/transport/consumer"
)
func AddEventCollector(ctx context.Context, mgr ctrl.Manager, kafkaConfig *transport.KafkaConfig) error {
// add the event consumer to manager
eventConsumer, err := consumer.NewSaramaConsumer(ctx, kafkaConfig)
if err != nil {
return fmt.Errorf("failed to create event consumer: %w", err)
}
if err := mgr.Add(eventConsumer); err != nil {
return fmt.Errorf("failed to add event consumer: %w", err)
}
// create the event dispatcher
eventDispatcher := newEventDispatcher(eventConsumer.MessageChan())
// register event processors with the event dispatcher
eventDispatcher.RegisterProcessor(policyv1.Kind,
eventprocessor.NewPolicyProcessor(ctx, eventConsumer))
// add the event dispatcher to manager
if err := mgr.Add(eventDispatcher); err != nil {
return fmt.Errorf("failed to add event dispatcher: %w", err)
}
return nil
}
type eventDispatcher struct {
log logr.Logger
messageChan <-chan *sarama.ConsumerMessage
processors map[string]eventprocessor.EventProcessor
}
func newEventDispatcher(messageChan <-chan *sarama.ConsumerMessage) *eventDispatcher {
return &eventDispatcher{
log: ctrl.Log.WithName("event-dispatcher"),
messageChan: messageChan,
processors: make(map[string]eventprocessor.EventProcessor),
}
}
func (e *eventDispatcher) Start(ctx context.Context) error {
for {
select {
case <-ctx.Done():
e.log.Info("context cancelled, exiting event dispatcher")
return nil
case message := <-e.messageChan:
e.log.Info("received message", "topic", message.Topic, "partition",
message.Partition, "offset", message.Offset)
event := &kube.EnhancedEvent{}
if err := json.Unmarshal(message.Value, &event); err != nil {
e.log.Error(err, "failed to unmarshal message to EnhancedEvent", "message", message)
continue
}
processor, ok := e.processors[event.InvolvedObject.Kind]
if !ok {
e.log.Info("no event processor registered for object kind",
"objectKind", event.InvolvedObject.Kind)
continue
}
processor.Process(event, &eventprocessor.EventOffset{
Topic: message.Topic,
Partition: message.Partition,
Offset: message.Offset,
})
}
}
}
func (e *eventDispatcher) RegisterProcessor(objectKind string, processor eventprocessor.EventProcessor) {
e.processors[objectKind] = processor
}