func (dd *DNSDiscovery) refresh(name string, ch chan<- config.TargetGroup) error {
response, err := lookupAll(name, dd.qtype)
dnsSDLookupsCount.Inc()
if err != nil {
dnsSDLookupFailuresCount.Inc()
return err
}
var tg config.TargetGroup
for _, record := range response.Answer {
target := model.LabelValue("")
switch addr := record.(type) {
case *dns.SRV:
// Remove the final dot from rooted DNS names to make them look more usual.
addr.Target = strings.TrimRight(addr.Target, ".")
target = model.LabelValue(fmt.Sprintf("%s:%d", addr.Target, addr.Port))
case *dns.A:
target = model.LabelValue(fmt.Sprintf("%s:%d", addr.A, dd.port))
case *dns.AAAA:
target = model.LabelValue(fmt.Sprintf("%s:%d", addr.AAAA, dd.port))
default:
log.Warnf("%q is not a valid SRV record", record)
continue
}
tg.Targets = append(tg.Targets, model.LabelSet{
model.AddressLabel: target,
dnsNameLabel: model.LabelValue(name),
})
}
tg.Source = name
ch <- tg
return nil
}
