// PrintAsText outputs all metrics in text format.
func (r *Registry) PrintAsText(w io.Writer) error {
var metricFamily prometheusgo.MetricFamily
var ret error
labels := r.getLabels()
for _, metric := range r.tracked {
metric.Inspect(func(v interface{}) {
if ret != nil {
return
}
if prom, ok := v.(PrometheusExportable); ok {
metricFamily.Reset()
metricFamily.Name = proto.String(exportedName(metric.GetName()))
metricFamily.Help = proto.String(metric.GetHelp())
prom.FillPrometheusMetric(&metricFamily)
if len(labels) != 0 {
// Set labels from registry. We only set one metric in the slice, but loop anyway.
for _, m := range metricFamily.Metric {
m.Label = labels
}
}
if l := prom.GetLabels(); len(l) != 0 {
// Append per-metric labels.
for _, m := range metricFamily.Metric {
m.Label = append(m.Label, l...)
}
}
if _, err := expfmt.MetricFamilyToText(w, &metricFamily); err != nil {
ret = err
}
}
})
}
return ret
}