Merge pull request #6 from mkelcik/new_ident_me_resolver

Add v4.ident.me resolver

README.md

@@ -15,7 +15,7 @@ Before run, you need configure this environment variables.
  - `CLOUDFLARE_ZONE` - (required) zone name with domain you want to check. See: [https://developers.cloudflare.com/fundamentals/get-started/concepts/accounts-and-zones/#zones](https://developers.cloudflare.com/fundamentals/get-started/concepts/accounts-and-zones/#zones)
  - `ON_CHANGE_COMMENT` - (optional) in the event that the ip address of the dns record changes, this comment will be added to the record
  - `CHECK_INTERVAL_SECONDS` - (optional) how often will the ip address of the records be checked (default: `300`)
- - `PUBLIC_IP_RESOLVER` - (optional) public ip address resolver. For now only resolving via `https://ifconfig.me` is implemented. (default: `ifconfig.me`)
+ - `PUBLIC_IP_RESOLVER` - (optional) public ip address resolver. (default: `ifconfig.me`) Available: `ifconfig.me`, `v4.ident.me`
 
 ### Building from source
 
@@ -43,6 +43,7 @@ version: "3"
 services:
   cf-dns-updater:
     image: mkelcik/cloudflare-ddns-update:latest
+    restart: unless-stopped
     environment:
       - CLOUDFLARE_DNS_TO_CHECK=my.testdomain.com,your.testdomain.com
       - CLOUDFLARE_API_KEY=your_cloudflare_api_key

docker-compose.yaml

@@ -2,6 +2,7 @@ version: "3"
 services:
   cf-dns-updater:
     image: mkelcik/cloudflare-ddns-update:latest
+    restart: unless-stopped
     environment:
       - CLOUDFLARE_DNS_TO_CHECK=my.testdomain.com,your.testdomain.com
       - CLOUDFLARE_API_KEY=your_cloudflare_api_key

main.go

@@ -17,13 +17,15 @@ type PublicIpResolver interface {
 	ResolvePublicIp(ctx context.Context) (net.IP, error)
 }
 
-func getResolver(resolverName string) PublicIpResolver {
+func getResolver(resolverName string) (PublicIpResolver, string) {
 	switch resolverName {
 	// HERE add another resolver if needed
+	case public_resolvers.V4IdentMeTag:
+		return public_resolvers.NewV4IdentMeDefault(), public_resolvers.V4IdentMeTag
 	case public_resolvers.IfConfigMeTag:
 		fallthrough
 	default:
-		return public_resolvers.NewDefaultIfConfigMe()
+		return public_resolvers.NewDefaultIfConfigMe(), public_resolvers.IfConfigMeTag
 	}
 }
 
@@ -47,20 +49,15 @@ func main() {
 		log.Fatal(err)
 	}
 
-	log.Println("waiting for update tick ...")
-	ticker := time.NewTicker(config.CheckInterval)
-	defer ticker.Stop()
-	for {
-		select {
-		case <-ticker.C:
-			log.Println("tick received checking ...")
-			func() {
-				currentPublicIP, err := getResolver(config.PublicIpResolverTag).ResolvePublicIp(ctx)
+	// public ip resolver
+	publicIpResolver, resolverTag := getResolver(config.PublicIpResolverTag)
+
+	checkFunc := func() {
+		currentPublicIP, err := publicIpResolver.ResolvePublicIp(ctx)
 		if err != nil {
 			log.Fatal(err)
 		}
-
-				log.Printf("Current public ip `%s`", currentPublicIP)
+		log.Printf("Current public ip `%s` (%s)", currentPublicIP, resolverTag)
 
 		dns, err := allDNSRecords(ctx, api, cloudflare.ZoneIdentifier(zoneID))
 		if err != nil {
@@ -91,7 +88,19 @@ func main() {
 				}
 			}
 		}
-			}()
+	}
+
+	log.Printf("checking ...")
+	checkFunc()
+
+	log.Println("waiting for check tick ...")
+	ticker := time.NewTicker(config.CheckInterval)
+	defer ticker.Stop()
+	for {
+		select {
+		case <-ticker.C:
+			log.Println("tick received checking ...")
+			checkFunc()
 		case <-ctx.Done():
 			break
 		}

public_resolvers/base_resolver.go

@@ -0,0 +1,44 @@
+package public_resolvers
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+)
+
+type Doer interface {
+	Do(*http.Request) (*http.Response, error)
+}
+
+type baseResolver struct {
+	client Doer
+	url    string
+}
+
+func (i baseResolver) ResolvePublicIp(ctx context.Context) (net.IP, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, i.url, nil)
+	if err != nil {
+		return net.IP{}, fmt.Errorf("error creating ifconfig request: %w", err)
+	}
+
+	resp, err := i.client.Do(req)
+	if err != nil {
+		return net.IP{}, err
+	}
+	defer func() {
+		_ = resp.Body.Close()
+	}()
+
+	if resp.StatusCode != http.StatusOK {
+		return net.IP{}, fmt.Errorf("unexpected response code %d", resp.StatusCode)
+	}
+
+	ipText, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return net.IP{}, fmt.Errorf("error reading body: %w", err)
+	}
+
+	return net.ParseIP(string(ipText)), nil
+}

public_resolvers/base_resolver_test.go

@@ -0,0 +1,97 @@
+package public_resolvers
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"net"
+	"net/http"
+	"reflect"
+	"testing"
+)
+
+// RoundTripFunc .
+type RoundTripFunc func(req *http.Request) *http.Response
+
+// RoundTrip .
+func (f RoundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
+	return f(req), nil
+}
+
+// NewTestClient returns *http.Client with Transport replaced to avoid making real calls
+func NewTestClient(fn RoundTripFunc) *http.Client {
+	return &http.Client{
+		Transport: RoundTripFunc(fn),
+	}
+}
+
+func Test_baseResolver_ResolvePublicIp(t *testing.T) {
+
+	testUrl := "http://my-test-url.url"
+	testIp := `192.168.0.100`
+
+	client := NewTestClient(func(req *http.Request) *http.Response {
+
+		if req.URL.String() != testUrl {
+			return &http.Response{
+				StatusCode: 500,
+				// Send response to be tested
+				Body: io.NopCloser(bytes.NewBufferString(`invalid url`)),
+				// Must be set to non-nil value or it panics
+				Header: make(http.Header),
+			}
+		}
+
+		return &http.Response{
+			StatusCode: 200,
+			// Send response to be tested
+			Body: io.NopCloser(bytes.NewBufferString(testIp)),
+			// Must be set to non-nil value or it panics
+			Header: make(http.Header),
+		}
+	})
+
+	type fields struct {
+		client Doer
+		url    string
+	}
+	type args struct {
+		ctx context.Context
+	}
+	tests := []struct {
+		name    string
+		fields  fields
+		args    args
+		want    net.IP
+		wantErr bool
+	}{
+		{
+			name: "check parse ip4",
+			fields: fields{
+				client: client,
+				url:    testUrl,
+			},
+			args: args{
+				ctx: context.Background(),
+			},
+			want:    net.ParseIP(testIp),
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			i := baseResolver{
+				client: tt.fields.client,
+				url:    tt.fields.url,
+			}
+			got, err := i.ResolvePublicIp(tt.args.ctx)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("ResolvePublicIp() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("ResolvePublicIp() got = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

public_resolvers/ifconfigme.go

@@ -1,28 +1,17 @@
 package public_resolvers
 
 import (
-	"context"
-	"fmt"
-	"io"
-	"net"
 	"net/http"
 	"time"
 )
 
 const (
 	IfConfigMeTag = "ifconfig.me"
-)
-
-type Doer interface {
-	Do(*http.Request) (*http.Response, error)
-}
-
-var (
 	ifConfigMeUrl = "https://ifconfig.me"
 )
 
 type IfConfigMe struct {
-	client Doer
+	baseResolver
 }
 
 func NewDefaultIfConfigMe() *IfConfigMe {
@@ -31,32 +20,11 @@ func NewDefaultIfConfigMe() *IfConfigMe {
 	})
 }
 
-func NewIfConfigMe(c Doer) *IfConfigMe {
-	return &IfConfigMe{client: c}
-}
-
-func (i IfConfigMe) ResolvePublicIp(ctx context.Context) (net.IP, error) {
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, ifConfigMeUrl, nil)
-	if err != nil {
-		return net.IP{}, fmt.Errorf("error creating ifconfig request: %w", err)
-	}
-
-	resp, err := i.client.Do(req)
-	if err != nil {
-		return net.IP{}, err
-	}
-	defer func() {
-		_ = resp.Body.Close()
-	}()
-
-	if resp.StatusCode != http.StatusOK {
-		return net.IP{}, fmt.Errorf("unexpected response code %d", resp.StatusCode)
-	}
-
-	ipText, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return net.IP{}, fmt.Errorf("error reading body: %w", err)
-	}
-
-	return net.ParseIP(string(ipText)), nil
+func NewIfConfigMe(client Doer) *IfConfigMe {
+	return &IfConfigMe{
+		baseResolver: baseResolver{
+			client: client,
+			url:    ifConfigMeUrl,
+		},
+	}
 }

public_resolvers/v4identme.go

@@ -0,0 +1,30 @@
+package public_resolvers
+
+import (
+	"net/http"
+	"time"
+)
+
+const (
+	V4IdentMeTag = "v4.ident.me"
+	v4IdentMeUrl = "https://v4.ident.me/"
+)
+
+type V4IdentMe struct {
+	baseResolver
+}
+
+func NewV4IdentMeDefault() *V4IdentMe {
+	return NewV4IdentMe(&http.Client{
+		Timeout: 10 * time.Second,
+	})
+}
+
+func NewV4IdentMe(client Doer) *V4IdentMe {
+	return &V4IdentMe{
+		baseResolver: baseResolver{
+			client: client,
+			url:    v4IdentMeUrl,
+		},
+	}
+}