Method consume

consumer_group.go:1052–1094

(topic string, partition int32)

}

func (s *consumerGroupSession) consume(topic string, partition int32) {
	// quick exit if rebalance is due
	select {
	case <-s.ctx.Done():
		return
	case <-s.parent.closed:
		return
	default:
	}

	// get next offset
	offset := s.parent.config.Consumer.Offsets.Initial
	if pom := s.offsets.findPOM(topic, partition); pom != nil {
		offset, _ = pom.NextOffset()
	}

	// create new claim
	claim, err := s.newClaimWithRetry(topic, partition, offset)
	if err != nil {
		s.parent.handleError(err, topic, partition)
		return
	}

	// trigger close when session is done
	go func() {
		select {
		case <-s.ctx.Done():
		case <-s.parent.closed:
		}
		claim.AsyncClose()
	}()

	// start processing
	if err := s.handler.ConsumeClaim(s, claim); err != nil {
		s.parent.handleError(err, topic, partition)
	}

	// ensure consumer is closed & drained
	claim.AsyncClose()
	for _, err := range claim.waitClosed() {
		s.parent.handleError(err, topic, partition)
	}
}

func (s *consumerGroupSession) release(withCleanup bool) (err error) {
	// signal release, stop heartbeat