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miekg_dns.go
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miekg_dns.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2023 Datadog, Inc.
package validationtest
import (
"context"
"net"
"testing"
"time"
dnstrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/miekg/dns"
"github.com/miekg/dns"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
type DNS struct {
msg *dns.Msg
mux *dns.ServeMux
addr string
numSpans int
}
func NewDNS() *DNS {
return &DNS{}
}
func (i *DNS) Name() string {
return "miekg/dns"
}
func (i *DNS) Init(t *testing.T) {
// TODO: enable when the integration implements naming schema
t.Skip("not implemented yet")
t.Helper()
i.addr = getFreeAddr(t).String()
server := &dns.Server{
Addr: i.addr,
Net: "udp",
Handler: dnstrace.WrapHandler(&handler{t: t, ig: i}),
}
// start the traced server
go func() {
require.NoError(t, server.ListenAndServe())
}()
// wait for the server to be ready
waitServerReady(t, server.Addr)
t.Cleanup(func() {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
assert.NoError(t, server.ShutdownContext(ctx))
})
}
func (i *DNS) GenSpans(t *testing.T) {
t.Helper()
msg := newMessage()
_, err := dnstrace.Exchange(msg, i.addr)
require.NoError(t, err)
i.numSpans++
t.Cleanup(func() {
i.numSpans = 0
})
}
func (i *DNS) NumSpans() int {
return i.numSpans
}
func (i *DNS) WithServiceName(_ string) {
return
}
func newMessage() *dns.Msg {
m := new(dns.Msg)
m.SetQuestion("miek.nl.", dns.TypeMX)
return m
}
type handler struct {
t *testing.T
ig *DNS
}
func (h *handler) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
m := new(dns.Msg)
m.SetReply(r)
assert.NoError(h.t, w.WriteMsg(m))
h.ig.numSpans++
}
func getFreeAddr(t *testing.T) net.Addr {
li, err := net.Listen("tcp", "127.0.0.1:0")
require.NoError(t, err)
addr := li.Addr()
require.NoError(t, li.Close())
return addr
}
func waitServerReady(t *testing.T, addr string) {
ticker := time.NewTicker(100 * time.Millisecond)
defer ticker.Stop()
timeoutChan := time.After(5 * time.Second)
for {
m := new(dns.Msg)
m.SetQuestion("miek.nl.", dns.TypeMX)
_, err := dns.Exchange(m, addr)
if err == nil {
break
}
select {
case <-ticker.C:
continue
case <-timeoutChan:
t.Fatal("timeout waiting for DNS server to be ready")
}
}
}