mirror of
https://github.com/traefik/mesh.git
synced 2026-06-01 18:37:57 +00:00
103 lines
2.3 KiB
Go
103 lines
2.3 KiB
Go
package dns
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import (
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"os"
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"testing"
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"time"
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"github.com/miekg/dns"
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"github.com/sirupsen/logrus"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"github.com/traefik/mesh/v2/pkg/k8s"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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)
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func TestServer(t *testing.T) {
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tests := []struct {
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desc string
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domain string
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expAnswer string
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}{
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{
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desc: "should return an answer with the resolved IP",
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domain: "whoami.default.traefik.mesh.",
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expAnswer: "10.10.10.10",
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},
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{
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desc: "should return an empty answer if IP cannot be resolved",
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domain: "whoami.foo.traefik.mesh.",
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},
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}
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for _, test := range tests {
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test := test
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t.Run(test.desc, func(t *testing.T) {
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logger := logrus.New()
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logger.SetOutput(os.Stdout)
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logger.SetLevel(logrus.DebugLevel)
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serviceLister := newFakeK8sClient(t, &v1.Service{
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ObjectMeta: metav1.ObjectMeta{
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Name: "shadow-svc-247b8d4abd40affb14cc82edca56b2c7",
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Namespace: "traefik-mesh",
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Labels: map[string]string{
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k8s.LabelServiceName: "whoami",
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k8s.LabelServiceNamespace: "default",
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},
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},
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Spec: v1.ServiceSpec{
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ClusterIP: "10.10.10.10",
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},
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})
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resolver := NewShadowServiceResolver("traefik.mesh", "traefik-mesh", serviceLister)
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addr, server := newTestServer(logger, resolver)
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defer func() {
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require.NoError(t, server.Shutdown())
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}()
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msg := &dns.Msg{}
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msg.SetQuestion(test.domain, dns.TypeA)
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client := dns.Client{Timeout: 5 * time.Second}
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res, _, err := client.Exchange(msg, addr)
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require.NoError(t, err)
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if test.expAnswer == "" {
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require.Len(t, res.Answer, 0)
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return
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}
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require.Len(t, res.Answer, 1)
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assert.Equal(t, res.Answer[0].Header().Rrtype, dns.TypeA)
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assert.Equal(t, res.Answer[0].(*dns.A).A.String(), test.expAnswer)
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})
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}
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}
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func newTestServer(logger logrus.FieldLogger, resolver *ShadowServiceResolver) (string, *Server) {
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syncCh := make(chan struct{}, 1)
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server := NewServer(0, resolver, logger)
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server.NotifyStartedFunc = func() {
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syncCh <- struct{}{}
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}
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go func() {
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if err := server.ListenAndServe(); err != nil {
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logger.Errorf("DNS server has stopped unexpectedly: %v", err)
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syncCh <- struct{}{}
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}
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}()
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<-syncCh
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return server.Server.PacketConn.LocalAddr().String(), server
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}
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