Method readingType

expfmt/text_parse.go:661–685

readingType represents the state where the last byte read (now in p.currentByte) is the first byte of the type hint after 'HELP'.

()

// readingType represents the state where the last byte read (now in
// p.currentByte) is the first byte of the type hint after 'HELP'.
func (p *TextParser) readingType() stateFn {
	if p.currentMF.Type != nil {
		p.parseError(fmt.Sprintf("second TYPE line for metric name %q, or TYPE reported after samples", p.currentMF.GetName()))
		return nil
	}
	// Rest of line is the type.
	if p.readTokenUntilNewline(false); p.err != nil {
		return nil // Unexpected end of input.
	}
	typ := strings.ToUpper(p.currentToken.String()) // Tolerate any combination of upper and lower case.
	metricType, ok := dto.MetricType_value[typ]     // Tolerate "gauge_histogram" (not originally part of the text format).
	if !ok {
		// We also want to tolerate "gaugehistogram" to mark a gauge
		// histogram, because that string is used in OpenMetrics. Note,
		// however, that gauge histograms do not officially exist in the
		// classic text format.
		if typ != "GAUGEHISTOGRAM" {
			p.parseError(fmt.Sprintf("unknown metric type %q", p.currentToken.String()))
			return nil
		}
		metricType = int32(dto.MetricType_GAUGE_HISTOGRAM)
	}
	p.currentMF.Type = dto.MetricType(metricType).Enum()
	return p.startOfLine
}

// parseError sets p.err to a ParseError at the current line with the given
// message.