Lasse R.H. Nielsen
b06a34fc5a
This never worked. It was silently accepted, at least if the future had no listeners, then any later attempt to use the future would cause a stack overflow or other impossible results. Moves some `_Future._complete` call out of try-catch. The `_complete` shouldn't throw (but before this fix it could). Moving them out of the `try`/`catch` makes such errors be reported as unhandled, instead of catching them and trying to complete the same future again with an error, when it's possibly in an inconsistent state. Fixes #43662. Based on https://github.com/dart-lang/sdk/issues/43662#issuecomment-2058870247 CoreLibraryReviewExempt: No response. Bug: http://dartbug.com/43662 Change-Id: I96a4f01bcd5b6cee93bba267299852569a9b905c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/363060 Commit-Queue: Lasse Nielsen <lrn@google.com> Reviewed-by: Nate Bosch <nbosch@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
82 lines
2.1 KiB
Dart
82 lines
2.1 KiB
Dart
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:async';
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import 'package:async_helper/async_helper.dart';
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import 'package:expect/expect.dart';
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import 'catch_errors.dart';
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main() {
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asyncStart();
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Completer done = new Completer();
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var events = [];
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StreamController controller;
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late Stream stream;
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// Test that streams live in the zone they have been listened too.
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// It doesn't matter how many zone-boundaries the stream traverses. What
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// counts is the zone where `listen` was invoked.
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catchErrors(() {
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catchErrors(() {
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controller = new StreamController();
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// Assignment to "global" `stream`.
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stream = controller.stream.map((x) {
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events.add("map $x");
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return x + 100;
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}).asBroadcastStream();
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// Consume stream in the nested zone.
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stream.transform(
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new StreamTransformer.fromHandlers(handleError: (e, st, sink) {
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sink.add("error $e");
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})).listen((x) {
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events.add("stream $x");
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});
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// Feed the controller in the nested zone.
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scheduleMicrotask(() {
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controller.add(1);
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controller.addError(2);
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controller.close();
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new Future.error("done");
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});
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})
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.listen((x) {
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events.add("listen: $x");
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if (x == "done") done.complete(true);
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})
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.asFuture()
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.then((_) {
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Expect.fail("Unexpected callback");
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});
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// Listen to stream in outer zone.
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stream.listen((x) {
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events.add("stream2 $x");
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});
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}).listen((x) {
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events.add("outer: $x");
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}, onDone: () {
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Expect.fail("Unexpected callback");
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});
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done.future.whenComplete(() {
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// Give handlers time to run.
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Timer.run(() {
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Expect.listEquals([
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"map 1",
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"stream 101",
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"stream2 101",
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"stream error 2",
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"listen: done",
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"outer: 2",
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], events);
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asyncEnd();
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});
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});
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}
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