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cmd/derper: count bootstrap dns unique lookups.

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Updates https://github.com/tailscale/corp/issues/13979

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
This commit is contained in:
Denton Gentry
2023-08-17 04:11:32 -07:00
committed by Denton Gentry
parent 7e15c78a5a
commit e8d140654a
3 changed files with 23 additions and 1 deletions
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8
cmd/derper/bootstrap_dns.go
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@@ -25,6 +25,7 @@ var (
dnsCache syncs.AtomicValue[dnsEntryMap]
dnsCacheBytes syncs.AtomicValue[[]byte] // of JSON
unpublishedDNSCache syncs.AtomicValue[dnsEntryMap]
bootstrapLookupMap syncs.Map[string, bool]
)
var (
@@ -35,6 +36,12 @@ var (
unpublishedDNSMisses = expvar.NewInt("counter_bootstrap_dns_unpublished_misses")
)
func init() {
expvar.Publish("counter_bootstrap_dns_queried_domains", expvar.Func(func() any {
return bootstrapLookupMap.Len()
}))
}
func refreshBootstrapDNSLoop() {
if *bootstrapDNS == "" && *unpublishedDNS == "" {
return
@@ -107,6 +114,7 @@ func handleBootstrapDNS(w http.ResponseWriter, r *http.Request) {
// Try answering a query from our hidden map first
if q := r.URL.Query().Get("q"); q != "" {
bootstrapLookupMap.Store(q, true)
if ips, ok := unpublishedDNSCache.Load()[q]; ok && len(ips) > 0 {
unpublishedDNSHits.Add(1)