func (c timingsCollector) Collect(ch chan<- prometheus.Metric) {
for k, h := range c.t.Histograms() {
if c.nLabels > 1 {
labels := split(k)
if len(labels) != c.nLabels {
err := fmt.Errorf("wrong number of labels in MultiTimings key: %d != %d (key=%q)", len(labels), c.nLabels, k)
ch <- prometheus.NewInvalidMetric(c.desc, err)
continue
}
ch <- histogramMetric(c.desc, h, 1/float64(time.Second), labels...)
continue
}
ch <- histogramMetric(c.desc, h, 1/float64(time.Second), k)
}
}
func (c countersCollector) Collect(ch chan<- prometheus.Metric) {
for k, n := range c.c.Counts() {
if c.nLabels > 1 {
labels := split(k)
if len(labels) != c.nLabels {
err := fmt.Errorf("wrong number of labels in MultiCounters key: %d != %d (key=%q)", len(labels), c.nLabels, k)
ch <- prometheus.NewInvalidMetric(c.desc, err)
continue
}
ch <- prometheus.MustNewConstMetric(c.desc, prometheus.GaugeValue, float64(n), labels...)
continue
}
ch <- prometheus.MustNewConstMetric(c.desc, prometheus.GaugeValue, float64(n), k)
}
}
// Collect implements Prometheus.Collector.
func (c collector) Collect(ch chan<- prometheus.Metric) {
start := time.Now()
pdus, err := ScrapeTarget(c.target, c.module)
if err != nil {
log.Errorf("Error scraping target %s: %s", c.target, err)
ch <- prometheus.NewInvalidMetric(prometheus.NewDesc("snmp_error", "Error scraping target", nil, nil), err)
return
}
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc("snmp_scrape_walk_duration_seconds", "Time SNMP walk/bulkwalk took.", nil, nil),
prometheus.GaugeValue,
float64(time.Since(start).Seconds()))
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc("snmp_scrape_pdus_returned", "PDUs returned from walk.", nil, nil),
prometheus.GaugeValue,
float64(len(pdus)))
oidToPdu := make(map[string]gosnmp.SnmpPDU, len(pdus))
for _, pdu := range pdus {
oidToPdu[pdu.Name[1:]] = pdu
}
metricTree := buildMetricTree(c.module.Metrics)
// Look for metrics that match each pdu.
PduLoop:
for oid, pdu := range oidToPdu {
head := metricTree
oidList := oidToList(oid)
for i, o := range oidList {
var ok bool
head, ok = head.children[o]
if !ok {
continue PduLoop
}
if head.metric != nil {
// Found a match.
ch <- pduToSample(oidList[i+1:], &pdu, head.metric, oidToPdu)
break
}
}
}
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc("snmp_scrape_duration_seconds", "Total SNMP time scrape took (walk and processing).", nil, nil),
prometheus.GaugeValue,
float64(time.Since(start).Seconds()))
}
func (e errorCollector) Collect(ch chan<- prometheus.Metric) {
ch <- prometheus.NewInvalidMetric(
prometheus.NewDesc("invalid_metric", "not helpful", nil, nil),
errors.New("collect error"),
)
}