Only complete the web socket future once (#9176)

dbc447b1 · Todd Volkert · GitHub · c6cd0bc3 · dbc447b1
Commit dbc447b1 authored Apr 04, 2017 by Todd Volkert Committed by GitHub Apr 04, 2017
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flutter_platform.dart packages/flutter_tools/lib/src/test/flutter_platform.dart +2 -1

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--- a/packages/flutter_tools/lib/src/test/flutter_platform.dart
+++ b/packages/flutter_tools/lib/src/test/flutter_platform.dart
@@ -143,7 +143,8 @@ class _FlutterPlatform extends PlatformPlugin {
      final Completer<WebSocket> webSocket = new Completer<WebSocket>();
      server.listen(
        (HttpRequest request) {
-          webSocket.complete(WebSocketTransformer.upgrade(request));
+          if (!webSocket.isCompleted)
+            webSocket.complete(WebSocketTransformer.upgrade(request));
        },
        onError: (dynamic error, dynamic stack) {
          // If you reach here, it's unlikely we're going to be able to really handle this well.