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events.go
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events.go
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package livemapper
import (
"context"
"fmt"
"strings"
"time"
"github.com/galexrt/fivenet/pkg/events"
natsutils "github.com/galexrt/fivenet/pkg/nats"
"github.com/nats-io/nats.go"
"go.uber.org/zap"
"google.golang.org/protobuf/proto"
)
const (
BaseSubject events.Subject = "livemap"
MarkerUpdate events.Type = "marker_update"
)
func (s *Server) registerEvents(ctx context.Context) error {
cfg := &nats.StreamConfig{
Name: "LIVEMAP",
Description: natsutils.Description,
Retention: nats.InterestPolicy,
Subjects: []string{fmt.Sprintf("%s.>", BaseSubject)},
Discard: nats.DiscardOld,
MaxAge: 2 * time.Minute,
}
if _, err := natsutils.CreateOrUpdateStream(ctx, s.js, cfg); err != nil {
return err
}
return nil
}
func (s *Server) sendUpdateEvent(tType events.Type, event proto.Message) error {
data, err := proto.Marshal(event)
if err != nil {
return err
}
if _, err := s.js.Publish(fmt.Sprintf("%s.%s", BaseSubject, tType), data); err != nil {
return err
}
return nil
}
func (s *Server) watchForEvents(msg *nats.Msg) {
split := strings.Split(msg.Subject, ".")
if len(split) < 2 {
return
}
tType := events.Type(split[1])
if tType == MarkerUpdate {
if err := s.refreshData(); err != nil {
s.logger.Error("failed to refresh livemap markers cache", zap.Error(err))
return
}
// Send marker update when data has been refreshed and we have at least one subscriber
if s.broker.SubCount() <= 0 {
return
}
s.broker.Publish(&brokerEvent{Send: MarkerUpdate})
}
}