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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"
"github.com/nats-io/nats.go/jetstream"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/trace"
"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, c context.Context) error {
cfg := jetstream.StreamConfig{
Name: "LIVEMAP",
Description: "Livemapper Service events",
Retention: jetstream.InterestPolicy,
Subjects: []string{fmt.Sprintf("%s.>", BaseSubject)},
Discard: jetstream.DiscardOld,
MaxAge: 2 * time.Minute,
Storage: jetstream.MemoryStorage,
}
if _, err := s.js.CreateOrUpdateStream(ctx, cfg); err != nil {
return err
}
consumer, err := s.js.CreateConsumer(ctx, cfg.Name, jetstream.ConsumerConfig{
DeliverPolicy: jetstream.DeliverNewPolicy,
FilterSubject: fmt.Sprintf("%s.>", BaseSubject),
})
if err != nil {
return err
}
if s.jsCons != nil {
s.jsCons.Stop()
}
s.jsCons, err = consumer.Consume(s.watchForEventsFunc(c), s.js.ConsumeErrHandlerWithRestart(c, s.logger, s.registerEvents))
if err != nil {
return err
}
return nil
}
func (s *Server) sendUpdateEvent(ctx context.Context, tType events.Type, event proto.Message) error {
data, err := proto.Marshal(event)
if err != nil {
return err
}
if _, err := s.js.Publish(ctx, fmt.Sprintf("%s.%s", BaseSubject, tType), data); err != nil {
return err
}
return nil
}
func (s *Server) watchForEventsFunc(ctx context.Context) jetstream.MessageHandler {
return func(msg jetstream.Msg) {
remoteCtx, err := events.GetJetstreamMsgContext(msg)
if err != nil {
s.logger.Error("failed to get js msg context", zap.Error(err))
}
_, span := otel.GetTracerProvider().Tracer("centrum").Start(trace.ContextWithRemoteSpanContext(ctx, remoteCtx), msg.Subject())
defer span.End()
if err := msg.Ack(); err != nil {
s.logger.Error("failed to ack message", zap.Error(err))
}
split := strings.Split(msg.Subject(), ".")
if len(split) < 2 {
return
}
tType := events.Type(split[1])
if tType == MarkerUpdate {
if err := s.refreshData(ctx); 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})
}
}
}