blob: 72430f2791c57accdd429e6406fd85c1c0400a8d [file] [log] [blame]
// 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:async';
import 'dart:convert';
import 'dart:io';
/// Reades through the print commands from [process] waiting for the magic phase
/// that contains microbenchmarks results as defined in
/// `dev/benchmarks/microbenchmarks/lib/common.dart`.
Future<Map<String, double>> readJsonResults(Process process) {
// IMPORTANT: keep these values in sync with dev/benchmarks/microbenchmarks/lib/common.dart
const String jsonStart = '================ RESULTS ================';
const String jsonEnd = '================ FORMATTED ==============';
const String jsonPrefix = ':::JSON:::';
bool jsonStarted = false;
final StringBuffer jsonBuf = StringBuffer();
final Completer<Map<String, double>> completer = Completer<Map<String, double>>();
final StreamSubscription<String> stderrSub = process.stderr
.transform<String>(const Utf8Decoder())
.transform<String>(const LineSplitter())
.listen((String line) {
stderr.writeln('[STDERR] $line');
bool processWasKilledIntentionally = false;
bool resultsHaveBeenParsed = false;
final StreamSubscription<String> stdoutSub = process.stdout
.transform<String>(const Utf8Decoder())
.transform<String>(const LineSplitter())
.listen((String line) async {
print('[STDOUT] $line');
if (line.contains(jsonStart)) {
jsonStarted = true;
if (jsonStarted && line.contains(jsonEnd)) {
final String jsonOutput = jsonBuf.toString();
// If we end up here and have already parsed the results, it suggests that
// we have received output from another test because our `flutter run`
// process did not terminate correctly.
if (resultsHaveBeenParsed) {
throw 'Additional JSON was received after results has already been '
'processed. This suggests the `flutter run` process may have lived '
'past the end of our test and collected additional output from the '
'next test.\n\n'
'The JSON below contains all collected output, including both from '
'the original test and what followed.\n\n'
jsonStarted = false;
processWasKilledIntentionally = true;
resultsHaveBeenParsed = true;
// Sending a SIGINT/SIGTERM to the process here isn't reliable because [process] is
// the shell (flutter is a shell script) and doesn't pass the signal on.
// Sending a `q` is an instruction to quit using the console runner.
// See
await process.stdin.flush();
// Also send a kill signal in case the `q` above didn't work.
try {
completer.complete(Map<String, double>.from(json.decode(jsonOutput) as Map<String, dynamic>));
} catch (ex) {
completer.completeError('Decoding JSON failed ($ex). JSON string was: $jsonOutput');
if (jsonStarted && line.contains(jsonPrefix)) {
jsonBuf.writeln(line.substring(line.indexOf(jsonPrefix) + jsonPrefix.length));
process.exitCode.then<void>((int code) async {
await Future.wait<void>(<Future<void>>[
if (!processWasKilledIntentionally && code != 0) {
completer.completeError('flutter run failed: exit code=$code');
return completer.future;