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events.go
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events.go
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package tracker
import (
"context"
"fmt"
"time"
"github.com/galexrt/fivenet/pkg/events"
"github.com/nats-io/nats.go/jetstream"
"google.golang.org/protobuf/proto"
)
const (
StreamName = "TRACKER"
BaseSubject events.Subject = "tracker"
UsersUpdate events.Type = "users_update"
)
func registerStreams(ctx context.Context, js *events.JSWrapper) error {
cfg := jetstream.StreamConfig{
Name: StreamName,
Description: "User Tracker Events",
Retention: jetstream.InterestPolicy,
Subjects: []string{fmt.Sprintf("%s.>", BaseSubject)},
Discard: jetstream.DiscardOld,
MaxAge: 2 * time.Minute,
Storage: jetstream.MemoryStorage,
}
if _, err := js.CreateOrUpdateStream(ctx, cfg); err != nil {
return err
}
return nil
}
func (m *Manager) sendUpdateEvent(ctx context.Context, tType events.Type, event proto.Message) error {
data, err := proto.Marshal(event)
if err != nil {
return err
}
if _, err := m.js.Publish(ctx, fmt.Sprintf("%s.%s", BaseSubject, tType), data); err != nil {
return err
}
return nil
}
func (s *Tracker) registerSubscriptions(ctx context.Context) error {
consumer, err := s.js.CreateConsumer(ctx, StreamName, jetstream.ConsumerConfig{
DeliverPolicy: jetstream.DeliverNewPolicy,
FilterSubject: fmt.Sprintf("%s.>", BaseSubject),
})
if err != nil {
return err
}
if s.jsCons != nil {
s.jsCons.Stop()
s.jsCons = nil
}
s.jsCons, err = consumer.Consume(s.watchForChanges,
s.js.ConsumeErrHandlerWithRestart(context.Background(), s.logger,
func(_ context.Context, ctx context.Context) error {
return s.registerSubscriptions(ctx)
}))
if err != nil {
return err
}
return nil
}