fix SDLConfiguration

Tun/Punchnet/SDLConfiguration.swift

@@ -51,20 +51,10 @@ public class SDLConfiguration {
     let serverHost: String
     let stunServers: [String]
 
-    lazy var stunSocketAddress: SocketAddress = {
+    let stunSocketAddress: SocketAddress
-        let stunServer = stunServers[0]
-        return try! SocketAddress.makeAddressResolvingHost(stunServer, port: 1365)
-    }()
 
     // 网络探测地址信息
-    lazy var stunProbeSocketAddressArray: [[SocketAddress]] = {
+    let stunProbeSocketAddressArray: [[SocketAddress]]
-        return stunServers.map { stunServer in
-            [
-                try! SocketAddress.makeAddressResolvingHost(stunServer, port: 1365),
-                try! SocketAddress.makeAddressResolvingHost(stunServer, port: 1366)
-            ]
-        }
-    }()
     
     let clientId: String
     let networkAddress: NetworkAddress
@@ -86,6 +76,13 @@ public class SDLConfiguration {
         self.version = version
         self.serverHost = serverHost
         self.stunServers = stunServers
+        self.stunSocketAddress = Self.makeStunSocketAddress(host: stunServers[0], port: 1365)
+        self.stunProbeSocketAddressArray = stunServers.map { stunServer in
+            [
+                Self.makeStunSocketAddress(host: stunServer, port: 1365),
+                Self.makeStunSocketAddress(host: stunServer, port: 1366)
+            ]
+        }
         self.clientId = clientId
         self.networkAddress = networkAddress
         self.accessToken = accessToken
@@ -96,6 +93,14 @@ public class SDLConfiguration {
     
 }
 
+private extension SDLConfiguration {
+
+    static func makeStunSocketAddress(host: String, port: Int) -> SocketAddress {
+        return try! SocketAddress.makeAddressResolvingHost(host, port: port)
+    }
+
+}
+
 // 解析配置文件
 extension SDLConfiguration {