From 2732915ddaff72d4fda5b364e9b2efdb4cbf2e70 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=BA=90=E6=96=87=E9=9B=A8?=
 <41315874+fumiama@users.noreply.github.com>
Date: Mon, 6 Oct 2025 02:01:37 +0800
Subject: [PATCH] feat: drop ipv6 test due to server down

---
 dns/cache.go    |  2 +-
 dns/dns.go      |  2 +-
 dns/dns_test.go | 10 +++++-----
 dns/doh.go      |  4 ++--
 go.mod          |  1 -
 go.sum          |  2 --
 ip/ipv6.go      | 27 +--------------------------
 7 files changed, 10 insertions(+), 38 deletions(-)

diff --git a/dns/cache.go b/dns/cache.go
index 2288f7d..22fb98c 100644
--- a/dns/cache.go
+++ b/dns/cache.go
@@ -16,7 +16,7 @@ func LookupHost(ctx context.Context, host string) (addrs []string, err error) {
 	if len(addrs) == 0 {
 		addrs, err = DefaultResolver.LookupHost(ctx, host)
 		if err != nil {
-			if ip.IsIPv6Available.Get() {
+			if ip.IsIPv6Available {
 				addrs, err = IPv6Servers.lookupHostDoH(ctx, host)
 			} else {
 				addrs, err = IPv4Servers.lookupHostDoH(ctx, host)
diff --git a/dns/dns.go b/dns/dns.go
index 5542c78..1d19636 100644
--- a/dns/dns.go
+++ b/dns/dns.go
@@ -273,7 +273,7 @@ var IPv4Servers = DNSList{
 var DefaultResolver = &net.Resolver{
 	PreferGo: true,
 	Dial: func(ctx context.Context, nw, _ string) (net.Conn, error) {
-		if ip.IsIPv6Available.Get() {
+		if ip.IsIPv6Available {
 			return IPv6Servers.DialContext(ctx, nil, terasu.DefaultFirstFragmentLen)
 		}
 		return IPv4Servers.DialContext(ctx, nil, terasu.DefaultFirstFragmentLen)
diff --git a/dns/dns_test.go b/dns/dns_test.go
index 0439e72..4edbefa 100644
--- a/dns/dns_test.go
+++ b/dns/dns_test.go
@@ -13,7 +13,7 @@ import (
 )
 
 func TestResolver(t *testing.T) {
-	t.Log("IsIPv6Available:", ip.IsIPv6Available.Get())
+	t.Log("IsIPv6Available:", ip.IsIPv6Available)
 	addrs, err := DefaultResolver.LookupHost(context.TODO(), "huggingface.co")
 	if err != nil {
 		t.Fatal(err)
@@ -25,9 +25,9 @@ func TestResolver(t *testing.T) {
 }
 
 func TestResolverFallback(t *testing.T) {
-	t.Log("IsIPv6Available:", ip.IsIPv6Available.Get())
+	t.Log("IsIPv6Available:", ip.IsIPv6Available)
 
-	if ip.IsIPv6Available.Get() {
+	if ip.IsIPv6Available {
 		addrs, err := IPv6Servers.lookupHostDoH(context.TODO(), "huggingface.co")
 		if err != nil {
 			t.Fatal(err)
@@ -48,7 +48,7 @@ func TestResolverFallback(t *testing.T) {
 }
 
 func TestDNS(t *testing.T) {
-	if ip.IsIPv6Available.Get() {
+	if ip.IsIPv6Available {
 		IPv6Servers.test()
 	}
 	IPv4Servers.test()
@@ -76,7 +76,7 @@ func TestBadDNS(t *testing.T) {
 		IPv6Servers.m = dotv6serversbak
 		IPv4Servers.m = dotv4serversbak
 	}()
-	if ip.IsIPv6Available.Get() {
+	if ip.IsIPv6Available {
 		IPv6Servers = DNSList{
 			m: map[string][]*dnsstat{},
 		}
diff --git a/dns/doh.go b/dns/doh.go
index 4611cc0..b8e3ccc 100644
--- a/dns/doh.go
+++ b/dns/doh.go
@@ -121,7 +121,7 @@ func lookupdoh(ctx context.Context, server, u string) (jr dohjsonresponse, err e
 	if err == nil {
 		return
 	}
-	if ip.IsIPv6Available.Get() {
+	if ip.IsIPv6Available {
 		jr, err = lookupdohwithtype(ctx, server, u, recordTypeA)
 	}
 	return
@@ -157,7 +157,7 @@ func lookupdohwithtype(ctx context.Context, server, u string, typ recordType) (j
 }
 
 func preferreddohtype() recordType {
-	if ip.IsIPv6Available.Get() {
+	if ip.IsIPv6Available {
 		return recordTypeAAAA
 	}
 	return recordTypeA
diff --git a/go.mod b/go.mod
index f0ee650..477cfb4 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,6 @@ go 1.20
 
 require (
 	github.com/FloatTech/ttl v0.0.0-20250224045156-012b1463287d
-	github.com/RomiChan/syncx v0.0.0-20240418144900-b7402ffdebc7
 	golang.org/x/net v0.24.0
 )
 
diff --git a/go.sum b/go.sum
index 79dcf50..d19112b 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,5 @@
 github.com/FloatTech/ttl v0.0.0-20250224045156-012b1463287d h1:mUQ/c3wXKsUGa4Sg9DBy01APXKB68PmobhxOyaJI7lY=
 github.com/FloatTech/ttl v0.0.0-20250224045156-012b1463287d/go.mod h1:fHZFWGquNXuHttu9dUYoKuNbm3dzLETnIOnm1muSfDs=
-github.com/RomiChan/syncx v0.0.0-20240418144900-b7402ffdebc7 h1:S/ferNiehVjNaBMNNBxUjLtVmP/YWD6Yh79RfPv4ehU=
-github.com/RomiChan/syncx v0.0.0-20240418144900-b7402ffdebc7/go.mod h1:vD7Ra3Q9onRtojoY5sMCLQ7JBgjUsrXDnDKyFxqpf9w=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
diff --git a/ip/ipv6.go b/ip/ipv6.go
index 880a271..9be0036 100644
--- a/ip/ipv6.go
+++ b/ip/ipv6.go
@@ -1,28 +1,3 @@
 package ip
 
-import (
-	"context"
-	"net/http"
-	"time"
-
-	"github.com/RomiChan/syncx"
-)
-
-var IsIPv6Available = syncx.Lazy[bool]{Init: func() bool {
-	ctx, cancel := context.WithTimeout(context.Background(), 4*time.Second)
-	defer cancel()
-	req, err := http.NewRequestWithContext(ctx, "GET", "http://v6.ipv6-test.com/json/widgetdata.php?callback=?", nil)
-	if err != nil {
-		return false
-	}
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return false
-	}
-	_ = resp.Body.Close()
-	return true
-}}
-
-func init() {
-	go IsIPv6Available.Get()
-}
+var IsIPv6Available = true