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/
service.go
74 lines (68 loc) · 1.57 KB
/
service.go
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package kafka
import (
"context"
eventgate "github.com/autom8ter/eventgate/gen/grpc/go"
"github.com/autom8ter/eventgate/internal/logger"
"github.com/golang/protobuf/proto"
"github.com/segmentio/kafka-go"
"go.uber.org/zap"
"golang.org/x/sync/errgroup"
)
type Service struct {
logger *logger.Logger
reader *kafka.Reader
writer *kafka.Writer
}
func (s *Service) Publish(ctx context.Context, event *eventgate.Event) error {
bits, err := proto.Marshal(event)
if err != nil {
return err
}
if err := s.writer.WriteMessages(ctx, kafka.Message{
Key: []byte(event.Id),
Value: bits,
}); err != nil {
return err
}
return nil
}
func (s *Service) GetChannel(ctx context.Context) (chan *eventgate.Event, error) {
events := make(chan *eventgate.Event)
go func() {
for {
select {
case <-ctx.Done():
return
default:
msg, err := s.reader.ReadMessage(context.Background())
if err != nil {
s.logger.Error("failed to read event", zap.Error(err))
return
}
var event eventgate.Event
if err := proto.Unmarshal(msg.Value, &event); err != nil {
s.logger.Error("failed to unmarshal event", zap.Error(err))
continue
}
events <- &event
}
}
}()
return events, nil
}
func NewService(logger *logger.Logger, reader *kafka.Reader, writer *kafka.Writer) (*Service, error) {
return &Service{
logger: logger,
reader: reader,
writer: writer,
}, nil
}
func (s *Service) Close() error {
group := &errgroup.Group{}
group.Go(s.writer.Close)
group.Go(s.reader.Close)
if err := group.Wait(); err != nil {
return err
}
return nil
}