Method startLabelValue

expfmt/text_parse.go:447–513

startLabelValue represents the state where the next byte read from p.buf is the start of a (quoted) label value (or whitespace leading up to it).

()

// startLabelValue represents the state where the next byte read from p.buf is
// the start of a (quoted) label value (or whitespace leading up to it).
func (p *TextParser) startLabelValue() stateFn {
	if p.skipBlankTab(); p.err != nil {
		return nil // Unexpected end of input.
	}
	if p.currentByte != '"' {
		p.parseError(fmt.Sprintf("expected '\"' at start of label value, found %q", p.currentByte))
		return nil
	}
	if p.readTokenAsLabelValue(); p.err != nil {
		return nil
	}
	if !model.LabelValue(p.currentToken.String()).IsValid() {
		p.parseError(fmt.Sprintf("invalid label value %q", p.currentToken.String()))
		return nil
	}
	p.currentLabelPair.Value = proto.String(p.currentToken.String())
	// Special treatment of summaries:
	// - Quantile labels are special, will result in dto.Quantile later.
	// - Other labels have to be added to currentLabels for signature calculation.
	if p.currentMF.GetType() == dto.MetricType_SUMMARY {
		if p.currentLabelPair.GetName() == model.QuantileLabel {
			if p.currentQuantile, p.err = parseFloat(p.currentLabelPair.GetValue()); p.err != nil {
				// Create a more helpful error message.
				p.parseError(fmt.Sprintf("expected float as value for 'quantile' label, got %q", p.currentLabelPair.GetValue()))
				p.currentLabelPairs = nil
				return nil
			}
		} else {
			p.currentLabels[p.currentLabelPair.GetName()] = p.currentLabelPair.GetValue()
		}
	}
	// Similar special treatment of histograms.
	if p.currentMF.GetType() == dto.MetricType_HISTOGRAM || p.currentMF.GetType() == dto.MetricType_GAUGE_HISTOGRAM {
		if p.currentLabelPair.GetName() == model.BucketLabel {
			if p.currentBucket, p.err = parseFloat(p.currentLabelPair.GetValue()); p.err != nil {
				// Create a more helpful error message.
				p.parseError(fmt.Sprintf("expected float as value for 'le' label, got %q", p.currentLabelPair.GetValue()))
				return nil
			}
		} else {
			p.currentLabels[p.currentLabelPair.GetName()] = p.currentLabelPair.GetValue()
		}
	}
	if p.skipBlankTab(); p.err != nil {
		return nil // Unexpected end of input.
	}
	switch p.currentByte {
	case ',':
		return p.startLabelName

	case '}':
		if p.currentMF == nil {
			p.parseError("invalid metric name")
			return nil
		}
		p.currentMetric.Label = append(p.currentMetric.Label, p.currentLabelPairs...)
		p.currentLabelPairs = nil
		if p.skipBlankTab(); p.err != nil {