Function writeSample

expfmt/text_create.go:276–331

writeSample writes a single sample in text format to w, given the metric name, the metric proto message itself, optionally an additional label name with a float64 value (use empty string as label name if not required), and the value. The function returns the number of bytes written and any error enc

(
	w enhancedWriter,
	name, suffix string,
	metric *dto.Metric,
	additionalLabelName string, additionalLabelValue float64,
	value float64,
)

// the value. The function returns the number of bytes written and any error
// encountered.
func writeSample(
	w enhancedWriter,
	name, suffix string,
	metric *dto.Metric,
	additionalLabelName string, additionalLabelValue float64,
	value float64,
) (int, error) {
	var written int
	n, err := w.WriteString(name)
	written += n
	if err != nil {
		return written, err
	}
	if suffix != "" {
		n, err = w.WriteString(suffix)
		written += n
		if err != nil {
			return written, err
		}
	}
	n, err = writeLabelPairs(
		w, metric.Label, additionalLabelName, additionalLabelValue,
	)
	written += n
	if err != nil {
		return written, err
	}
	err = w.WriteByte(' ')
	written++
	if err != nil {
		return written, err
	}
	n, err = writeFloat(w, value)
	written += n
	if err != nil {
		return written, err
	}
	if metric.TimestampMs != nil {
		err = w.WriteByte(' ')
		written++
		if err != nil {
			return written, err
		}
		n, err = writeInt(w, *metric.TimestampMs)
		written += n
		if err != nil {
			return written, err
		}
	}
	err = w.WriteByte('\n')
	written++
	if err != nil {
		return written, err
	}
	return written, nil
}

// writeLabelPairs converts a slice of LabelPair proto messages plus the