func()

in banyand/query/processor.go [119:177]

• 54 lines of code
• 12 McCabe index (conditional complexity)

func (p *measureQueryProcessor) Rev(message bus.Message) (resp bus.Message) {
	queryCriteria, ok := message.Data().(*measurev1.QueryRequest)
	now := time.Now().UnixNano()
	if !ok {
		resp = bus.NewMessage(bus.MessageID(now), common.NewError("invalid event data type"))
		return
	}
	ml := p.log.Named("measure", queryCriteria.Metadata.Group, queryCriteria.Metadata.Name)
	if e := ml.Debug(); e.Enabled() {
		e.RawJSON("req", logger.Proto(queryCriteria)).Msg("received a query event")
	}

	meta := queryCriteria.GetMetadata()
	ec, err := p.measureService.Measure(meta)
	if err != nil {
		resp = bus.NewMessage(bus.MessageID(now), common.NewError("fail to get execution context for measure %s: %v", meta.GetName(), err))
		return
	}

	s, err := logical_measure.BuildSchema(ec)
	if err != nil {
		resp = bus.NewMessage(bus.MessageID(now), common.NewError("fail to build schema for measure %s: %v", meta.GetName(), err))
		return
	}

	plan, err := logical_measure.Analyze(context.TODO(), queryCriteria, meta, s)
	if err != nil {
		resp = bus.NewMessage(bus.MessageID(now), common.NewError("fail to analyze the query request for measure %s: %v", meta.GetName(), err))
		return
	}

	if e := ml.Debug(); e.Enabled() {
		e.Str("plan", plan.String()).Msg("query plan")
	}

	mIterator, err := plan.(executor.MeasureExecutable).Execute(ec)
	if err != nil {
		ml.Error().Err(err).RawJSON("req", logger.Proto(queryCriteria)).Msg("fail to close the query plan")
		resp = bus.NewMessage(bus.MessageID(now), common.NewError("fail to execute the query plan for measure %s: %v", meta.GetName(), err))
		return
	}
	defer func() {
		if err = mIterator.Close(); err != nil {
			ml.Error().Err(err).RawJSON("req", logger.Proto(queryCriteria)).Msg("fail to close the query plan")
		}
	}()
	result := make([]*measurev1.DataPoint, 0)
	for mIterator.Next() {
		current := mIterator.Current()
		if len(current) > 0 {
			result = append(result, current[0])
		}
	}
	if e := ml.Debug(); e.Enabled() {
		e.RawJSON("ret", logger.Proto(&measurev1.QueryResponse{DataPoints: result})).Msg("got a measure")
	}
	resp = bus.NewMessage(bus.MessageID(now), result)
	return
}