func()

in internal/pkg/bulk/opSearch.go [123:240]
91 lines of code
14 McCabe index (conditional complexity)

func (b *Bulker) flushSearch(ctx context.Context, queue queueT) error {
	start := time.Now()

	const kRoughEstimatePerItem = 256

	bufSz := queue.cnt * kRoughEstimatePerItem
	if bufSz < queue.pending {
		bufSz = queue.pending
	}

	var buf bytes.Buffer
	buf.Grow(bufSz)

	queueCnt := 0
	links := []apm.SpanLink{}
	for n := queue.head; n != nil; n = n.next {
		buf.Write(n.buf.Bytes())
		queueCnt += 1
		if n.spanLink != nil {
			links = append(links, *n.spanLink)
		}
	}
	if len(links) == 0 {
		links = nil
	}
	span, ctx := apm.StartSpanOptions(ctx, "Flush: search", "search", apm.SpanOptions{
		Links: links,
	})
	defer span.End()

	// Do actual bulk request; and send response on chan
	var (
		res *esapi.Response
		err error
	)

	if queue.ty == kQueueFleetSearch {
		req := esapi.FleetMsearchRequest{
			Body: bytes.NewReader(buf.Bytes()),
		}
		res, err = req.Do(ctx, b.es)
	} else {
		req := esapi.MsearchRequest{
			Body: bytes.NewReader(buf.Bytes()),
		}
		res, err = req.Do(ctx, b.es)
	}

	if err != nil {
		return err
	}

	if res.Body != nil {
		defer res.Body.Close()
	}

	if res.IsError() {
		zerolog.Ctx(ctx).Warn().Str("mod", kModBulk).Str("error.message", res.String()).Msg("bulker.flushSearch: Fail writeMsearchBody")
		return parseError(res, zerolog.Ctx(ctx))
	}

	// Reuse buffer
	buf.Reset()

	bodySz, err := buf.ReadFrom(res.Body)
	if err != nil {
		zerolog.Ctx(ctx).Error().Err(err).Str("mod", kModBulk).Msg("MsearchResponse error")
		return err
	}

	// prealloc slice
	var blk MsearchResponse
	blk.Responses = make([]MsearchResponseItem, 0, queueCnt)

	if err = easyjson.Unmarshal(buf.Bytes(), &blk); err != nil {
		zerolog.Ctx(ctx).Error().Err(err).Str("mod", kModBulk).Msg("Unmarshal error")
		return err
	}

	zerolog.Ctx(ctx).Trace().
		Err(err).
		Str("mod", kModBulk).
		Dur("rtt", time.Since(start)).
		Int("took", blk.Took).
		Int("cnt", len(blk.Responses)).
		Int("bufSz", bufSz).
		Int64("bodySz", bodySz).
		Msg("flushSearch")

	if len(blk.Responses) != queueCnt {
		return fmt.Errorf("Bulk queue length mismatch")
	}

	// WARNING: Once we start pushing items to
	// the queue, the node pointers are invalid.
	// Do NOT return a non-nil value or failQueue
	// up the stack will fail.

	n := queue.head
	for i := range blk.Responses {
		next := n.next // 'n' is invalid immediately on channel send

		response := &blk.Responses[i]

		select {
		case n.ch <- respT{
			err:  response.deriveError(),
			idx:  n.idx,
			data: response,
		}:
		default:
			panic("Unexpected blocked response channel on flushSearch")
		}
		n = next
	}

	return nil
}