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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:html' as html;
import 'package:collection/collection.dart';
import 'package:flutter/foundation.dart';
import 'package:meta/dart2js.dart';
/// Expected sequence of method calls.
const List<String> callChain = <String>['baz', 'bar', 'foo'];
final List<StackFrame> expectedProfileStackFrames = callChain.map<StackFrame>((String method) {
return StackFrame(
number: -1,
packageScheme: '<unknown>',
package: '<unknown>',
packagePath: '<unknown>',
line: -1,
column: -1,
className: 'Object',
method: method,
source: '',
);
}).toList();
// TODO(yjbanov): fix these stack traces when https://github.com/flutter/flutter/issues/50753 is fixed.
const List<StackFrame> expectedDebugStackFrames = <StackFrame>[
StackFrame(
number: -1,
packageScheme: 'package',
package: 'packages',
packagePath: 'web_integration/stack_trace.dart',
line: 119,
column: 3,
className: '<unknown>',
method: 'baz',
source: '',
),
StackFrame(
number: -1,
packageScheme: 'package',
package: 'packages',
packagePath: 'web_integration/stack_trace.dart',
line: 114,
column: 3,
className: '<unknown>',
method: 'bar',
source: '',
),
StackFrame(
number: -1,
packageScheme: 'package',
package: 'packages',
packagePath: 'web_integration/stack_trace.dart',
line: 109,
column: 3,
className: '<unknown>',
method: 'foo',
source: '',
),
];
/// Tests that we do not crash while parsing Web stack traces.
///
/// This test is run in debug, profile, and release modes.
void main() {
final StringBuffer output = StringBuffer();
try {
try {
foo();
} catch (expectedError, expectedStackTrace) {
final List<StackFrame> parsedFrames = StackFrame.fromStackTrace(expectedStackTrace);
if (parsedFrames.isEmpty) {
throw Exception(
'Failed to parse stack trace. Got empty list of stack frames.\n'
'Stack trace:\n$expectedStackTrace'
);
}
// Symbols in release mode are randomly obfuscated, so there's no good way to
// validate the contents. However, profile mode can be checked.
if (kProfileMode) {
_checkStackFrameContents(parsedFrames, expectedProfileStackFrames, expectedStackTrace);
}
if (kDebugMode) {
_checkStackFrameContents(parsedFrames, expectedDebugStackFrames, expectedStackTrace);
}
}
output.writeln('--- TEST SUCCEEDED ---');
} catch (unexpectedError, unexpectedStackTrace) {
output.writeln('--- UNEXPECTED EXCEPTION ---');
output.writeln(unexpectedError);
output.writeln(unexpectedStackTrace);
output.writeln('--- TEST FAILED ---');
}
print(output);
html.HttpRequest.request(
'/test-result',
method: 'POST',
sendData: '$output',
);
}
@noInline
void foo() {
bar();
}
@noInline
void bar() {
baz();
}
@noInline
void baz() {
throw Exception('Test error message');
}
void _checkStackFrameContents(List<StackFrame> parsedFrames, List<StackFrame> expectedFrames, dynamic stackTrace) {
// Filter out stack frames outside this library so this test is less brittle.
final List<StackFrame> actual = parsedFrames
.where((StackFrame frame) => callChain.contains(frame.method))
.toList();
final bool stackFramesAsExpected = ListEquality<StackFrame>(StackFrameEquality()).equals(actual, expectedFrames);
if (!stackFramesAsExpected) {
throw Exception(
'Stack frames parsed incorrectly:\n'
'Expected:\n${expectedFrames.join('\n')}\n'
'Actual:\n${actual.join('\n')}\n'
'Stack trace:\n$stackTrace'
);
}
}
/// Use custom equality to ignore [StackFrame.source], which is not important
/// for the purposes of this test.
class StackFrameEquality implements Equality<StackFrame> {
@override
bool equals(StackFrame e1, StackFrame e2) {
return e1.number == e2.number &&
e1.packageScheme == e2.packageScheme &&
e1.package == e2.package &&
e1.packagePath == e2.packagePath &&
e1.line == e2.line &&
e1.column == e2.column &&
e1.className == e2.className &&
e1.method == e2.method;
}
@override
int hash(StackFrame e) {
return Object.hash(e.number, e.packageScheme, e.package, e.packagePath, e.line, e.column, e.className, e.method);
}
@override
bool isValidKey(Object? o) => o is StackFrame;
}