mirror of
https://github.com/coredns/coredns.git
synced 2026-09-01 09:37:05 -04:00
48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
|
package test
|
||
|
|
|
||
|
|
import (
|
||
|
|
"testing"
|
||
|
|
|
||
|
|
"github.com/coredns/coredns/plugin/metrics"
|
||
|
|
"github.com/coredns/coredns/plugin/test"
|
||
|
|
|
||
|
|
"github.com/miekg/dns"
|
||
|
|
)
|
||
|
|
|
||
|
|
// TestShed checks that with the shed plugin installed a query is answered
|
||
|
|
// over both UDP (through the plugin's deferred single-writer path) and
|
||
|
|
// TCP (which shed passes through), and that its drop counter is exported.
|
||
|
|
func TestShed(t *testing.T) {
|
||
|
|
corefile := `.:0 {
|
||
|
|
shed
|
||
|
|
prometheus localhost:0
|
||
|
|
whoami
|
||
|
|
}`
|
||
|
|
|
||
|
|
i, udp, tcp, err := CoreDNSServerAndPorts(corefile)
|
||
|
|
if err != nil {
|
||
|
|
t.Fatalf("Could not get CoreDNS serving instance: %s", err)
|
||
|
|
}
|
||
|
|
defer i.Stop()
|
||
|
|
|
||
|
|
m := new(dns.Msg)
|
||
|
|
m.SetQuestion("whoami.example.org.", dns.TypeA)
|
||
|
|
|
||
|
|
if r, err := dns.Exchange(m, udp); err != nil || r.Rcode != dns.RcodeSuccess {
|
||
|
|
t.Fatalf("Expected UDP reply, got %v: %v", r, err)
|
||
|
|
}
|
||
|
|
c := &dns.Client{Net: "tcp"}
|
||
|
|
if r, _, err := c.Exchange(m, tcp); err != nil || r.Rcode != dns.RcodeSuccess {
|
||
|
|
t.Fatalf("Expected TCP reply, got %v: %v", r, err)
|
||
|
|
}
|
||
|
|
|
||
|
|
data := test.Scrape("http://" + metrics.ListenAddr + "/metrics")
|
||
|
|
got, labels := test.MetricValue("coredns_shed_dropped_total", data)
|
||
|
|
if got != "0" {
|
||
|
|
t.Errorf("Expected coredns_shed_dropped_total 0, but got %s", got)
|
||
|
|
}
|
||
|
|
if labels["reason"] == "" {
|
||
|
|
t.Errorf("Expected coredns_shed_dropped_total to carry a reason label, got %v", labels)
|
||
|
|
}
|
||
|
|
}
|