add functional options to NewXip for testability

xip/xip.go

@@ -15,6 +15,44 @@ import (
 type Xip struct {
 	server      dns.Server
 	nameServers []string
+	domain      string
+	email       string
+	dnsPort     uint
+}
+
+type Option func(*Xip)
+
+func WithDomain(domain string) Option {
+	return func(x *Xip) {
+		x.domain = domain
+	}
+}
+
+func WithEmail(email string) Option {
+	return func(x *Xip) {
+		x.email = email
+	}
+}
+
+func WithDnsPort(port uint) Option {
+	return func(x *Xip) {
+		x.dnsPort = port
+	}
+}
+
+func WithNameServers(nameServers []string) Option {
+	return func(x *Xip) {
+		for i, ns := range nameServers {
+			name := fmt.Sprintf("ns%d.%s.", i+1, x.domain)
+			ip := net.ParseIP(ns)
+
+			entry := hardcodedRecords[name]
+			entry.A = append(entry.A, ip)
+			hardcodedRecords[name] = entry
+
+			x.nameServers = append(x.nameServers, name)
+		}
+	}
 }
 
 var (
@@ -26,29 +64,27 @@ var (
 
 func (xip *Xip) SetTXTRecord(fqdn string, value string) {
 	utils.Logger.Trace().Str("fqdn", fqdn).Str("value", value).Msg("Trying to set TXT record")
-	config := utils.GetConfig()
+	if fqdn != fmt.Sprintf("_acme-challenge.%s.", xip.domain) {
-	if fqdn != fmt.Sprintf("_acme-challenge.%s.", config.Domain) {
 		utils.Logger.Trace().Str("fqdn", fqdn).Msg("Not allowed, abort setting TXT record")
 		return
 	}
 
 	if rootRecords, ok := hardcodedRecords[fqdn]; ok {
 		rootRecords.TXT = []string{value}
-		hardcodedRecords[fmt.Sprintf("_acme-challenge.%s.", config.Domain)] = rootRecords
+		hardcodedRecords[fmt.Sprintf("_acme-challenge.%s.", xip.domain)] = rootRecords
 	}
 }
 
 func (xip *Xip) UnsetTXTRecord(fqdn string) {
 	utils.Logger.Trace().Str("fqdn", fqdn).Msg("Trying to unset TXT record")
-	config := utils.GetConfig()
+	if fqdn != fmt.Sprintf("_acme-challenge.%s.", xip.domain) {
-	if fqdn != fmt.Sprintf("_acme-challenge.%s.", config.Domain) {
 		utils.Logger.Trace().Str("fqdn", fqdn).Msg("Not allowed, abort unsetting TXT record")
 		return
 	}
 
 	if rootRecords, ok := hardcodedRecords[fqdn]; ok {
 		rootRecords.TXT = []string{}
-		hardcodedRecords[fmt.Sprintf("_acme-challenge.%s.", config.Domain)] = rootRecords
+		hardcodedRecords[fmt.Sprintf("_acme-challenge.%s.", xip.domain)] = rootRecords
 	}
 }
 
@@ -268,7 +304,6 @@ func emailToRname(email string) string {
 }
 
 func (xip *Xip) soaRecord(question dns.Question) *dns.SOA {
-	config := utils.GetConfig()
 	soa := new(dns.SOA)
 	soa.Hdr = dns.RR_Header{
 		Name:     question.Name,
@@ -278,7 +313,7 @@ func (xip *Xip) soaRecord(question dns.Question) *dns.SOA {
 		Rdlength: 0,
 	}
 	soa.Ns = xip.nameServers[0]
-	soa.Mbox = emailToRname(config.Email)
+	soa.Mbox = emailToRname(xip.email)
 	soa.Serial = 2024072600
 	soa.Refresh = uint32((time.Minute * 15).Seconds())
 	soa.Retry = uint32((time.Minute * 15).Seconds())
@@ -403,18 +438,28 @@ func (xip *Xip) initHardcodedRecords() {
 	hardcodedRecords[fmt.Sprintf("_acme-challenge.%s.", config.Domain)] = hardcodedRecord{TXT: []string{}}
 }
 
-func NewXip() (xip *Xip) {
+func NewXip(opts ...Option) (xip *Xip) {
 	config := utils.GetConfig()
-	xip = &Xip{}
+	xip = &Xip{
+		domain:  config.Domain,
+		email:   config.Email,
+		dnsPort: config.DnsPort,
+	}
 
+	for _, opt := range opts {
+		opt(xip)
+	}
+
+	if len(xip.nameServers) == 0 {
 		xip.initHardcodedRecords()
+	}
 
 	xip.server = dns.Server{
-		Addr: fmt.Sprintf(":%d", config.DnsPort),
+		Addr: fmt.Sprintf(":%d", xip.dnsPort),
 		Net:  "udp",
 	}
 
-	zone := fmt.Sprintf("%s.", config.Domain)
+	zone := fmt.Sprintf("%s.", xip.domain)
 	dns.HandleFunc(zone, xip.handleDnsRequest)
 
 	return xip

xip/xip_test.go

@@ -5,13 +5,14 @@ import (
 	"os/exec"
 	"strings"
 	"testing"
-
-	"github.com/spf13/viper"
 )
 
 func TestResolveDashUnit(t *testing.T) {
-	// viper.Set("dns-port", 9053)
+	xip := NewXip(
-	xip := NewXip()
+		WithDomain("local-ip.sh"),
+		WithDnsPort(9053),
+		WithNameServers([]string{"1.2.3.4", "5.6.7.8"}),
+	)
 
 	A := xip.fqdnToA("192-168-1-29.local-ip.sh")
 	expected := "192.168.1.29"
@@ -41,20 +42,26 @@ func TestResolveDashUnit(t *testing.T) {
 }
 
 func TestConstructor(t *testing.T) {
-	viper.Set("dns-port", 9053)
+	xip := NewXip(
-	xip := NewXip()
+		WithDomain("local-ip.sh"),
+		WithDnsPort(9053),
+		WithNameServers([]string{"1.2.3.4", "5.6.7.8"}),
+	)
 
-	if xip.nameServers[0] != "ns1.local-ip.sh" {
+	if xip.nameServers[0] != "ns1.local-ip.sh." {
-		t.Error("")
+		t.Errorf("expected ns1.local-ip.sh., got %s", xip.nameServers[0])
 	}
-	if xip.nameServers[1] != "ns2.local-ip.sh" {
+	if xip.nameServers[1] != "ns2.local-ip.sh." {
-		t.Error("")
+		t.Errorf("expected ns2.local-ip.sh., got %s", xip.nameServers[1])
 	}
 }
 
 func TestResolveDashE2E(t *testing.T) {
-	viper.Set("dns-port", 9053)
+	xip := NewXip(
-	xip := NewXip()
+		WithDomain("local-ip.sh"),
+		WithDnsPort(9053),
+		WithNameServers([]string{"1.2.3.4", "5.6.7.8"}),
+	)
 	go xip.StartServer()
 
 	cmd := exec.Command("dig", "@localhost", "-p", "9053", "192-168-1-29.local-ip.sh", "+short")
@@ -70,25 +77,17 @@ func TestResolveDashE2E(t *testing.T) {
 
 func BenchmarkResolveDashBasic(b *testing.B) {
 	b.Skip()
-	// var semaphore = make(chan int, 40)
-	// var done = make(chan bool, 1)
 
 	for i := 0; i < b.N; i++ {
 		port := 9053 + i
-		viper.Set("dns-port", port)
+		xip := NewXip(
-		xip := NewXip()
+			WithDomain("local-ip.sh"),
+			WithDnsPort(uint(port)),
+			WithNameServers([]string{"1.2.3.4", "5.6.7.8"}),
+		)
 		go xip.StartServer()
 
-		// semaphore <- 1
-		// go func() {
 		cmd := exec.Command("dig", "@localhost", "-p", fmt.Sprint(port), "192-168-1-29.local-ip.sh", "+short")
 		cmd.Run()
-
-		// <-semaphore
-		// if i == b.N {
-		// done <- true
-		// }
-		// }()
 	}
-	// <-done
 }