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package metrics
import (
"context"
"testing"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/pkg/dnstest"
"github.com/coredns/coredns/plugin/test"
"github.com/miekg/dns"
)
func TestMetrics(t *testing.T) {
met := New("localhost:0")
if err := met.OnStartup(); err != nil {
t.Fatalf("Failed to start metrics handler: %s", err)
}
defer met.OnFinalShutdown()
met.AddZone("example.org.")
tests := []struct {
next plugin.Handler
qname string
qtype uint16
metric string
expectedValue string
}{
// This all works because 1 bucket (1 zone, 1 type)
{
next: test.NextHandler(dns.RcodeSuccess, nil),
qname: "example.org.",
metric: "coredns_dns_requests_total",
expectedValue: "1",
},
{
next: test.NextHandler(dns.RcodeSuccess, nil),
qname: "example.org.",
metric: "coredns_dns_requests_total",
expectedValue: "2",
},
{
next: test.NextHandler(dns.RcodeSuccess, nil),
qname: "example.org.",
metric: "coredns_dns_requests_total",
expectedValue: "3",
},
{
next: test.NextHandler(dns.RcodeSuccess, nil),
qname: "example.org.",
metric: "coredns_dns_responses_total",
expectedValue: "4",
},
}
ctx := context.TODO()
for i, tc := range tests {
req := new(dns.Msg)
if tc.qtype == 0 {
tc.qtype = dns.TypeA
}
req.SetQuestion(tc.qname, tc.qtype)
met.Next = tc.next
rec := dnstest.NewRecorder(&test.ResponseWriter{})
_, err := met.ServeDNS(ctx, rec, req)
if err != nil {
t.Fatalf("Test %d: Expected no error, but got %s", i, err)
}
result := test.Scrape("http://" + ListenAddr + "/metrics")
if tc.expectedValue != "" {
got, _ := test.MetricValue(tc.metric, result)
if got != tc.expectedValue {
t.Errorf("Test %d: Expected value %s for metrics %s, but got %s", i, tc.expectedValue, tc.metric, got)
}
}
}
}
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