add option to force webhooks to be made over IPv4

.changeset/eager-foxes-allow.md

@@ -0,0 +1,5 @@
+---
+"github.com/livekit/protocol": patch
+---
+
+add option to only use IPv4 for webhooks

webhook/notifier.go

@@ -185,6 +185,7 @@ type HTTPClientParams struct {
 	RetryWaitMax  time.Duration
 	MaxRetries    int
 	ClientTimeout time.Duration
+	ForceIPv4     bool
 }
 
 type FilterParams struct {

webhook/resource_url_notifier.go

@@ -21,6 +21,8 @@ import (
 	"encoding/base64"
 	"errors"
 	"fmt"
+	"net"
+	"net/http"
 	"sync"
 	"time"
 
@@ -130,6 +132,18 @@ func NewResourceURLNotifier(params ResourceURLNotifierParams) *ResourceURLNotifi
 		rhc.HTTPClient.Timeout = params.ClientTimeout
 	}
 	rhc.Logger = &logAdapter{}
+	if params.ForceIPv4 {
+		var tr *http.Transport
+		if existing, ok := rhc.HTTPClient.Transport.(*http.Transport); ok && existing != nil {
+			tr = existing.Clone()
+		} else {
+			tr = http.DefaultTransport.(*http.Transport).Clone()
+		}
+		tr.DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
+			return (&net.Dialer{}).DialContext(ctx, "tcp4", addr)
+		}
+		rhc.HTTPClient.Transport = tr
+	}
 	r := &ResourceURLNotifier{
 		params:         params,
 		client:         rhc,

webhook/url_notifier.go

@@ -20,6 +20,8 @@ import (
 	"crypto/sha256"
 	"encoding/base64"
 	"fmt"
+	"net"
+	"net/http"
 	"sync"
 	"time"
 
@@ -91,6 +93,18 @@ func NewURLNotifier(params URLNotifierParams) *URLNotifier {
 	if params.ClientTimeout > 0 {
 		rhc.HTTPClient.Timeout = params.ClientTimeout
 	}
+	if params.ForceIPv4 {
+		var tr *http.Transport
+		if existing, ok := rhc.HTTPClient.Transport.(*http.Transport); ok && existing != nil {
+			tr = existing.Clone()
+		} else {
+			tr = http.DefaultTransport.(*http.Transport).Clone()
+		}
+		tr.DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
+			return (&net.Dialer{}).DialContext(ctx, "tcp4", addr)
+		}
+		rhc.HTTPClient.Transport = tr
+	}
 	n := &URLNotifier{
 		params: params,
 		client: rhc,

webhook/webhook_test.go

@@ -229,6 +229,9 @@ func TestURLNotifierFilter(t *testing.T) {
 			Config: URLNotifierConfig{
 				QueueSize: 20,
 			},
+			HTTPClientParams: HTTPClientParams{
+				ForceIPv4: true,
+			},
 		})
 		defer urlNotifier.Stop(false)