init panel-service

services/panel-service/internal/kafka/panel.go

@@ -0,0 +1,62 @@
+package kafka
+
+import (
+	"context"
+
+	"github.com/rs/zerolog/log"
+	"github.com/segmentio/kafka-go"
+	"google.golang.org/protobuf/proto"
+
+	"github.com/hexolan/panels/panel-service/internal"
+	"github.com/hexolan/panels/panel-service/internal/rpc/panelv1"
+)
+
+type PanelEventProducer struct {
+	writer *kafka.Writer
+}
+
+func NewPanelEventProducer(cfg internal.Config) PanelEventProducer {
+	writer := &kafka.Writer{
+		Addr: kafka.TCP(cfg.KafkaBrokers...),
+		Topic: "panel",
+		Balancer: &kafka.LeastBytes{},
+	}
+
+	return PanelEventProducer{writer: writer}
+}
+
+func (ep PanelEventProducer) SendEvent(event *panelv1.PanelEvent) {
+	// Encode the protobuf event
+	evtBytes, err := proto.Marshal(event)
+	if err != nil {
+		log.Panic().Err(err).Msg("failed to marshal event")
+	}
+
+	// Write to kafka
+	err = ep.writer.WriteMessages(context.Background(), kafka.Message{Value: evtBytes})
+	if err != nil {
+		// todo: implement recovery method e.g. storing failed event dispatches on DB to send on recovery (such as from Kafka going offline)
+		log.Panic().Err(err).Msg("failed to dispatch event")
+	}
+}
+
+func (ep PanelEventProducer) DispatchCreatedEvent(panel internal.Panel) {
+	go ep.SendEvent(&panelv1.PanelEvent{
+		Type: "created",
+		Data: panelv1.PanelToProto(&panel),
+	})
+}
+
+func (ep PanelEventProducer) DispatchUpdatedEvent(panel internal.Panel) {
+	go ep.SendEvent(&panelv1.PanelEvent{
+		Type: "updated",
+		Data: panelv1.PanelToProto(&panel),
+	})
+}
+
+func (ep PanelEventProducer) DispatchDeletedEvent(id int64) {
+	go ep.SendEvent(&panelv1.PanelEvent{
+		Type: "deleted",
+		Data: &panelv1.Panel{Id: internal.StringifyPanelId(id)},
+	})
+}