🔌 Add IPv6 support

Co-Authored-By: kiyon <kiyonlin@163.com>

app.go

@@ -109,6 +109,7 @@ type Settings struct {
 	ETag bool `json:"etag"`
 
 	// Known networks are "tcp", "tcp4" (IPv4-only), "tcp6" (IPv6-only)
+	// Prefork is not support for IPv6 addresses
 	// Default: "tcp"
 	Network string
 
@@ -489,12 +490,11 @@ func (app *App) Listen(address interface{}, tlsconfig ...*tls.Config) error {
 	app.init()
 	// Start prefork
 	if app.Settings.Prefork {
+		if app.Settings.Network == "ipv6" || isIPv6(addr) {
+			log.Fatal("prefork does not support ipv6 networking")
+		}
 		return app.prefork(addr, tlsconfig...)
 	}
-	// tcp4 is the default network
-	if isIPv6(addr) {
-		// do some better parsing
-	}
 	// Setup listener
 	ln, err := net.Listen(app.Settings.Network, addr)
 	if err != nil {
@@ -675,10 +675,8 @@ func (app *App) startupMessage(addr string, tls bool, pids string) {
 	logo += `%s  __%s / __/ / / /_/ /  __/ /      %s` + "\n"
 	logo += `%s    /_/   /_/_.___/\___/_/%s %s` + "\n"
 
-	// statup details
+	host, port := parseAddr(addr)
 	var (
-		host      = strings.Split(addr, ":")[0]
-		port      = strings.Split(addr, ":")[1]
 		tlsStr    = "FALSE"
 		routesLen = len(app.Routes())
 		osName    = utils.ToUpper(runtime.GOOS)

prefork.go

@@ -32,7 +32,7 @@ func (app *App) prefork(addr string, tlsconfig ...*tls.Config) (err error) {
 		runtime.GOMAXPROCS(1)
 		var ln net.Listener
 		// SO_REUSEPORT is not supported on Windows, use SO_REUSEADDR instead
-		if ln, err = reuseport(app.Settings.Network, addr); err != nil {
+		if ln, err = reuseport("tcp4", addr); err != nil {
 			if !app.Settings.DisableStartupMessage {
 				time.Sleep(100 * time.Millisecond) // avoid colliding with startup message
 			}

utils.go

@@ -190,14 +190,17 @@ func parseTokenList(noneMatchBytes []byte) []string {
 	return list
 }
 
-// func isIPv4(address string) bool {
-// 	return strings.Count(address, ":") < 2
-// }
-
 func isIPv6(address string) bool {
 	return strings.Count(address, ":") >= 2
 }
 
+func parseAddr(raw string) (host, port string) {
+	if i := strings.LastIndex(raw, ":"); i != -1 {
+		return raw[:i], raw[i+1:]
+	}
+	return raw, ""
+}
+
 // https://golang.org/src/net/net.go#L113
 // Helper methods for application#test
 type testAddr string