dart2js: fetch http Resources

sdk/lib/_internal/js_runtime/lib/js_helper.dart

Index: sdk/lib/_internal/js_runtime/lib/js_helper.dart
diff --git a/sdk/lib/_internal/js_runtime/lib/js_helper.dart b/sdk/lib/_internal/js_runtime/lib/js_helper.dart
index 6692d2723c426a4e4f984899aac1ac55fb05e77b..b4bca79df598542d2bd710a5072bb3144c82b8a7 100644
--- a/sdk/lib/_internal/js_runtime/lib/js_helper.dart
+++ b/sdk/lib/_internal/js_runtime/lib/js_helper.dart
@@ -3903,6 +3903,41 @@ Future<Null> _loadHunk(String hunkName) {
   return completer.future;
 }
 
+Future<String> readHttp(String uri) {
+  Completer<String> completer = new Completer<String>();
+
+  void success(String data) {
+    completer.complete(data);
+  }
+
+  void failure([error, StackTrace stackTrace]) {
+    completer.completeError(
+        new Exception("Loading $uri failed: $error"),
+        stackTrace);
+  }
+
+  enterJsAsync();
+  Future<String> leavingFuture = completer.future.whenComplete(() {
+    leaveJsAsync();
+  });
+
+  var xhr = JS('var', 'new XMLHttpRequest()');
+  JS('void', '#.open("GET", #)', xhr, uri);
+  JS('void', '#.addEventListener("load", #, false)',
+     xhr, convertDartClosureToJS((event) {
+    int status = JS('int', '#.status', xhr);
+    if (status != 200) {
+      failure("Status code: $status");
+    }
+    String data = JS('String', '#.responseText', xhr);
+    success(data);
+  }, 1));
+
+  JS('void', '#.addEventListener("error", #, false)', xhr, failure);
+  JS('void', '#.addEventListener("abort", #, false)', xhr, failure);
+  JS('void', '#.send()', xhr);

[Siggi Cherem (dart-lang), 2015/08/22 02:21:16]

+ return leavingFuture; ?

[Harry Terkelsen, 2015/08/25 00:03:57]

Done.

+}
+
 class MainError extends Error implements NoSuchMethodError {
   final String _message;