Added timeout parameter to RawSocket and Socket connect, which allows for the specification of a ma…

runtime/bin/socket_patch.dart

Index: runtime/bin/socket_patch.dart
diff --git a/runtime/bin/socket_patch.dart b/runtime/bin/socket_patch.dart
index bbfceb8687e1b481dc7388dfd0dee6ee59bd8540..34a97c8f6fde70a45a5721eaee3a66ab85508709 100644
--- a/runtime/bin/socket_patch.dart
+++ b/runtime/bin/socket_patch.dart
@@ -14,8 +14,9 @@ class RawServerSocket {
 @patch
 class RawSocket {
   @patch
-  static Future<RawSocket> connect(host, int port, {sourceAddress}) {
-    return _RawSocket.connect(host, port, sourceAddress);
+  static Future<RawSocket> connect(host, int port,
+      {sourceAddress, Duration timeout}) {
+    return _RawSocket.connect(host, port, sourceAddress, timeout);
   }
 }
 
@@ -394,7 +395,8 @@ class _NativeSocket extends _NativeSocketNativeWrapper with _ServiceObject {
     });
   }
 
-  static Future<_NativeSocket> connect(host, int port, sourceAddress) {
+  static Future<_NativeSocket> connect(
+      host, int port, sourceAddress, Duration timeout) {
     _throwOnBadPort(port);
     if (sourceAddress != null && sourceAddress is! _InternetAddress) {
       if (sourceAddress is String) {
@@ -415,7 +417,23 @@ class _NativeSocket extends _NativeSocketNativeWrapper with _ServiceObject {
       var it = addresses.iterator;
       var error = null;
       var connecting = new HashMap();
+      Timer timeoutTimer = null;
+      void timeoutHandler() {
+        connecting.forEach((s, t) {
+          t.cancel();
+          s.close();
+          s.setHandlers();
+          s.setListening(read: false, write: false);
+          error = createError(
+              null, "Connection timed out, host: ${host}, port: ${port}");
+          completer.completeError(error);
+        });
+      }
+
       void connectNext() {
+        if ((timeout != null) && (timeoutTimer == null)) {
+          timeoutTimer = new Timer(timeout, timeoutHandler);
+        }
         if (!it.moveNext()) {
           if (connecting.isEmpty) {
             assert(error != null);
@@ -1185,9 +1203,10 @@ class _RawSocket extends Stream<RawSocketEvent> implements RawSocket {
   // Flag to handle Ctrl-D closing of stdio on Mac OS.
   bool _isMacOSTerminalInput = false;
 
-  static Future<RawSocket> connect(host, int port, sourceAddress) {
+  static Future<RawSocket> connect(
+      host, int port, sourceAddress, Duration timeout) {
     return _NativeSocket
-        .connect(host, port, sourceAddress)
+        .connect(host, port, sourceAddress, timeout)
         .then((socket) => new _RawSocket(socket));
   }
 
@@ -1366,9 +1385,10 @@ class _ServerSocket extends Stream<Socket> implements ServerSocket {
 @patch
 class Socket {
   @patch
-  static Future<Socket> connect(host, int port, {sourceAddress}) {
+  static Future<Socket> connect(host, int port,
+      {sourceAddress, Duration timeout}) {
     return RawSocket
-        .connect(host, port, sourceAddress: sourceAddress)
+        .connect(host, port, sourceAddress: sourceAddress, timeout: timeout)
         .then((socket) => new _Socket(socket));
   }
 }