dev/bots/utils.dart - mirrors/flutter - Git at Google

 // 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:core' hide print;
 import 'dart:io' as system show exit;
 import 'dart:io' hide exit;
 import 'dart:math' as math;

 import 'package:meta/meta.dart';

 const Duration _quietTimeout = Duration(minutes: 10); // how long the output should be hidden between calls to printProgress before just being verbose

 final bool hasColor = stdout.supportsAnsiEscapes;

 final String bold = hasColor ? '\x1B[1m' : ''; // shard titles
 final String red = hasColor ? '\x1B[31m' : ''; // errors
 final String green = hasColor ? '\x1B[32m' : ''; // section titles, commands
 final String yellow = hasColor ? '\x1B[33m' : ''; // indications that a test was skipped (usually renders orange or brown)
 final String cyan = hasColor ? '\x1B[36m' : ''; // paths
 final String reverse = hasColor ? '\x1B[7m' : ''; // clocks
 final String gray = hasColor ? '\x1B[30m' : ''; // subtle decorative items (usually renders as dark gray)
 final String white = hasColor ? '\x1B[37m' : ''; // last log line (usually renders as light gray)
 final String reset = hasColor ? '\x1B[0m' : '';

 const int kESC = 0x1B;
 const int kOpenSquareBracket = 0x5B;
 const int kCSIParameterRangeStart = 0x30;
 const int kCSIParameterRangeEnd = 0x3F;
 const int kCSIIntermediateRangeStart = 0x20;
 const int kCSIIntermediateRangeEnd = 0x2F;
 const int kCSIFinalRangeStart = 0x40;
 const int kCSIFinalRangeEnd = 0x7E;


 String get redLine {
   if (hasColor) {
     return '$red${'━' * stdout.terminalColumns}$reset';
   }
   return '━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━';
 }

 String get clock {
   final DateTime now = DateTime.now();
   return '$reverse▌'
          '${now.hour.toString().padLeft(2, "0")}:'
          '${now.minute.toString().padLeft(2, "0")}:'
          '${now.second.toString().padLeft(2, "0")}'
          '▐$reset';
 }

 String prettyPrintDuration(Duration duration) {
   String result = '';
   final int minutes = duration.inMinutes;
   if (minutes > 0) {
     result += '${minutes}min ';
   }
   final int seconds = duration.inSeconds - minutes * 60;
   final int milliseconds = duration.inMilliseconds - (seconds * 1000 + minutes * 60 * 1000);
   result += '$seconds.${milliseconds.toString().padLeft(3, "0")}s';
   return result;
 }

 typedef PrintCallback = void Function(Object? line);
 typedef VoidCallback = void Function();

 // Allow print() to be overridden, for tests.
 //
 // Files that import this library should not import `print` from dart:core
 // and should not use dart:io's `stdout` or `stderr`.
 //
 // By default this hides log lines between `printProgress` calls unless a
 // timeout expires or anything calls `foundError`.
 //
 // Also used to implement `--verbose` in test.dart.
 PrintCallback print = _printQuietly;

 // Called by foundError and used to implement `--abort-on-error` in test.dart.
 VoidCallback? onError;

 bool get hasError => _hasError;
 bool _hasError = false;

 Iterable<String> get errorMessages => _errorMessages;
 List<String> _errorMessages = <String>[];

 final List<String> _pendingLogs = <String>[];
 Timer? _hideTimer; // When this is null, the output is verbose.

 void foundError(List<String> messages) {
   assert(messages.isNotEmpty);
   // Make the error message easy to notice in the logs by
   // wrapping it in a red box.
   final int width = math.max(15, (hasColor ? stdout.terminalColumns : 80) - 1);
   print('$red╔═╡${bold}ERROR$reset$red╞═${"═" * (width - 9)}');
   for (final String message in messages.expand((String line) => line.split('\n'))) {
     print('$red║$reset $message');
   }
   print('$red╚${"═" * width}');
   // Normally, "print" actually prints to the log. To make the errors visible,
   // and to include useful context, print the entire log up to this point, and
   // clear it. Subsequent messages will continue to not be logged until there is
   // another error.
   _pendingLogs.forEach(_printLoudly);
   _pendingLogs.clear();
   _errorMessages.addAll(messages);
   _hasError = true;
   if (onError != null) {
     onError!();
   }
 }

 @visibleForTesting
 void resetErrorStatus() {
   _hasError = false;
   _errorMessages.clear();
   _pendingLogs.clear();
   _hideTimer?.cancel();
   _hideTimer = null;
 }

 Never reportErrorsAndExit() {
   _hideTimer?.cancel();
   _hideTimer = null;
   print(redLine);
   print('For your convenience, the error messages reported above are repeated here:');
   _errorMessages.forEach(print);
   print(redLine);
   system.exit(1);
 }

 void printProgress(String message) {
   _pendingLogs.clear();
   _hideTimer?.cancel();
   _hideTimer = null;
   print('$clock $message $reset');
   if (hasColor) {
     // This sets up a timer to switch to verbose mode when the tests take too long,
     // so that if a test hangs we can see the logs.
     // (This is only supported with a color terminal. When the terminal doesn't
     // support colors, the scripts just print everything verbosely, that way in
     // CI there's nothing hidden.)
     _hideTimer = Timer(_quietTimeout, () {
       _hideTimer = null;
       _pendingLogs.forEach(_printLoudly);
       _pendingLogs.clear();
     });
   }
 }

 final Pattern _lineBreak = RegExp(r'[\r\n]');

 void _printQuietly(Object? message) {
   // The point of this function is to avoid printing its output unless the timer
   // has gone off in which case the function assumes verbose mode is active and
   // prints everything. To show that progress is still happening though, rather
   // than showing nothing at all, it instead shows the last line of output and
   // keeps overwriting it. To do this in color mode, carefully measures the line
   // of text ignoring color codes, which is what the parser below does.
   if (_hideTimer != null) {
     _pendingLogs.add(message.toString());
     String line = '$message'.trimRight();
     final int start = line.lastIndexOf(_lineBreak) + 1;
     int index = start;
     int length = 0;
     while (index < line.length && length < stdout.terminalColumns) {
       if (line.codeUnitAt(index) == kESC) { // 0x1B
         index += 1;
         if (index < line.length && line.codeUnitAt(index) == kOpenSquareBracket) { // 0x5B, [
           // That was the start of a CSI sequence.
           index += 1;
           while (index < line.length && line.codeUnitAt(index) >= kCSIParameterRangeStart
                                      && line.codeUnitAt(index) <= kCSIParameterRangeEnd) { // 0x30..0x3F
             index += 1; // ...parameter bytes...
           }
           while (index < line.length && line.codeUnitAt(index) >= kCSIIntermediateRangeStart
                                      && line.codeUnitAt(index) <= kCSIIntermediateRangeEnd) { // 0x20..0x2F
             index += 1; // ...intermediate bytes...
           }
           if (index < line.length && line.codeUnitAt(index) >= kCSIFinalRangeStart
                                   && line.codeUnitAt(index) <= kCSIFinalRangeEnd) { // 0x40..0x7E
             index += 1; // ...final byte.
           }
         }
       } else {
         index += 1;
         length += 1;
       }
     }
     line = line.substring(start, index);
     if (line.isNotEmpty) {
       stdout.write('\r\x1B[2K$white$line$reset');
     }
   } else {
     _printLoudly('$message');
   }
 }

 void _printLoudly(String message) {
   if (hasColor) {
     // Overwrite the last line written by _printQuietly.
     stdout.writeln('\r\x1B[2K$reset${message.trimRight()}');
   } else {
     stdout.writeln(message);
   }
 }

 // THE FOLLOWING CODE IS A VIOLATION OF OUR STYLE GUIDE
 // BECAUSE IT INTRODUCES A VERY FLAKY RACE CONDITION
 // https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#never-check-if-a-port-is-available-before-using-it-never-add-timeouts-and-other-race-conditions
 // DO NOT USE THE FOLLOWING FUNCTIONS
 // DO NOT WRITE CODE LIKE THE FOLLOWING FUNCTIONS
 // https://github.com/flutter/flutter/issues/109474

 int _portCounter = 8080;

 /// Finds the next available local port.
 Future<int> findAvailablePortAndPossiblyCauseFlakyTests() async {
   while (!await _isPortAvailable(_portCounter)) {
     _portCounter += 1;
   }
   return _portCounter++;
 }

 Future<bool> _isPortAvailable(int port) async {
   try {
     final RawSocket socket = await RawSocket.connect('localhost', port);
     socket.shutdown(SocketDirection.both);
     await socket.close();
     return false;
   } on SocketException {
     return true;
   }
 }
	// 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:core' hide print;
	import 'dart:io' as system show exit;
	import 'dart:io' hide exit;
	import 'dart:math' as math;

	import 'package:meta/meta.dart';

	const Duration _quietTimeout = Duration(minutes: 10); // how long the output should be hidden between calls to printProgress before just being verbose

	final bool hasColor = stdout.supportsAnsiEscapes;

	final String bold = hasColor ? '\x1B[1m' : ''; // shard titles
	final String red = hasColor ? '\x1B[31m' : ''; // errors
	final String green = hasColor ? '\x1B[32m' : ''; // section titles, commands
	final String yellow = hasColor ? '\x1B[33m' : ''; // indications that a test was skipped (usually renders orange or brown)
	final String cyan = hasColor ? '\x1B[36m' : ''; // paths
	final String reverse = hasColor ? '\x1B[7m' : ''; // clocks
	final String gray = hasColor ? '\x1B[30m' : ''; // subtle decorative items (usually renders as dark gray)
	final String white = hasColor ? '\x1B[37m' : ''; // last log line (usually renders as light gray)
	final String reset = hasColor ? '\x1B[0m' : '';

	const int kESC = 0x1B;
	const int kOpenSquareBracket = 0x5B;
	const int kCSIParameterRangeStart = 0x30;
	const int kCSIParameterRangeEnd = 0x3F;
	const int kCSIIntermediateRangeStart = 0x20;
	const int kCSIIntermediateRangeEnd = 0x2F;
	const int kCSIFinalRangeStart = 0x40;
	const int kCSIFinalRangeEnd = 0x7E;


	String get redLine {
	if (hasColor) {
	return '$red${'━' * stdout.terminalColumns}$reset';
	}
	return '━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━';
	}

	String get clock {
	final DateTime now = DateTime.now();
	return '$reverse▌'
	'${now.hour.toString().padLeft(2, "0")}:'
	'${now.minute.toString().padLeft(2, "0")}:'
	'${now.second.toString().padLeft(2, "0")}'
	'▐$reset';
	}

	String prettyPrintDuration(Duration duration) {
	String result = '';
	final int minutes = duration.inMinutes;
	if (minutes > 0) {
	result += '${minutes}min ';
	}
	final int seconds = duration.inSeconds - minutes * 60;
	final int milliseconds = duration.inMilliseconds - (seconds * 1000 + minutes * 60 * 1000);
	result += '$seconds.${milliseconds.toString().padLeft(3, "0")}s';
	return result;
	}

	typedef PrintCallback = void Function(Object? line);
	typedef VoidCallback = void Function();

	// Allow print() to be overridden, for tests.
	//
	// Files that import this library should not import `print` from dart:core
	// and should not use dart:io's `stdout` or `stderr`.
	//
	// By default this hides log lines between `printProgress` calls unless a
	// timeout expires or anything calls `foundError`.
	//
	// Also used to implement `--verbose` in test.dart.
	PrintCallback print = _printQuietly;

	// Called by foundError and used to implement `--abort-on-error` in test.dart.
	VoidCallback? onError;

	bool get hasError => _hasError;
	bool _hasError = false;

	Iterable<String> get errorMessages => _errorMessages;
	List<String> _errorMessages = <String>[];

	final List<String> _pendingLogs = <String>[];
	Timer? _hideTimer; // When this is null, the output is verbose.

	void foundError(List<String> messages) {
	assert(messages.isNotEmpty);
	// Make the error message easy to notice in the logs by
	// wrapping it in a red box.
	final int width = math.max(15, (hasColor ? stdout.terminalColumns : 80) - 1);
	print('$red╔═╡${bold}ERROR$reset$red╞═${"═" * (width - 9)}');
	for (final String message in messages.expand((String line) => line.split('\n'))) {
	print('$red║$reset $message');
	}
	print('$red╚${"═" * width}');
	// Normally, "print" actually prints to the log. To make the errors visible,
	// and to include useful context, print the entire log up to this point, and
	// clear it. Subsequent messages will continue to not be logged until there is
	// another error.
	_pendingLogs.forEach(_printLoudly);
	_pendingLogs.clear();
	_errorMessages.addAll(messages);
	_hasError = true;
	if (onError != null) {
	onError!();
	}
	}

	@visibleForTesting
	void resetErrorStatus() {
	_hasError = false;
	_errorMessages.clear();
	_pendingLogs.clear();
	_hideTimer?.cancel();
	_hideTimer = null;
	}

	Never reportErrorsAndExit() {
	_hideTimer?.cancel();
	_hideTimer = null;
	print(redLine);
	print('For your convenience, the error messages reported above are repeated here:');
	_errorMessages.forEach(print);
	print(redLine);
	system.exit(1);
	}

	void printProgress(String message) {
	_pendingLogs.clear();
	_hideTimer?.cancel();
	_hideTimer = null;
	print('$clock $message $reset');
	if (hasColor) {
	// This sets up a timer to switch to verbose mode when the tests take too long,
	// so that if a test hangs we can see the logs.
	// (This is only supported with a color terminal. When the terminal doesn't
	// support colors, the scripts just print everything verbosely, that way in
	// CI there's nothing hidden.)
	_hideTimer = Timer(_quietTimeout, () {
	_hideTimer = null;
	_pendingLogs.forEach(_printLoudly);
	_pendingLogs.clear();
	});
	}
	}

	final Pattern _lineBreak = RegExp(r'[\r\n]');

	void _printQuietly(Object? message) {
	// The point of this function is to avoid printing its output unless the timer
	// has gone off in which case the function assumes verbose mode is active and
	// prints everything. To show that progress is still happening though, rather
	// than showing nothing at all, it instead shows the last line of output and
	// keeps overwriting it. To do this in color mode, carefully measures the line
	// of text ignoring color codes, which is what the parser below does.
	if (_hideTimer != null) {
	_pendingLogs.add(message.toString());
	String line = '$message'.trimRight();
	final int start = line.lastIndexOf(_lineBreak) + 1;
	int index = start;
	int length = 0;
	while (index < line.length && length < stdout.terminalColumns) {
	if (line.codeUnitAt(index) == kESC) { // 0x1B
	index += 1;
	if (index < line.length && line.codeUnitAt(index) == kOpenSquareBracket) { // 0x5B, [
	// That was the start of a CSI sequence.
	index += 1;
	while (index < line.length && line.codeUnitAt(index) >= kCSIParameterRangeStart
	&& line.codeUnitAt(index) <= kCSIParameterRangeEnd) { // 0x30..0x3F
	index += 1; // ...parameter bytes...
	}
	while (index < line.length && line.codeUnitAt(index) >= kCSIIntermediateRangeStart
	&& line.codeUnitAt(index) <= kCSIIntermediateRangeEnd) { // 0x20..0x2F
	index += 1; // ...intermediate bytes...
	}
	if (index < line.length && line.codeUnitAt(index) >= kCSIFinalRangeStart
	&& line.codeUnitAt(index) <= kCSIFinalRangeEnd) { // 0x40..0x7E
	index += 1; // ...final byte.
	}
	}
	} else {
	index += 1;
	length += 1;
	}
	}
	line = line.substring(start, index);
	if (line.isNotEmpty) {
	stdout.write('\r\x1B[2K$white$line$reset');
	}
	} else {
	_printLoudly('$message');
	}
	}

	void _printLoudly(String message) {
	if (hasColor) {
	// Overwrite the last line written by _printQuietly.
	stdout.writeln('\r\x1B[2K$reset${message.trimRight()}');
	} else {
	stdout.writeln(message);
	}
	}

	// THE FOLLOWING CODE IS A VIOLATION OF OUR STYLE GUIDE
	// BECAUSE IT INTRODUCES A VERY FLAKY RACE CONDITION
	// https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#never-check-if-a-port-is-available-before-using-it-never-add-timeouts-and-other-race-conditions
	// DO NOT USE THE FOLLOWING FUNCTIONS
	// DO NOT WRITE CODE LIKE THE FOLLOWING FUNCTIONS
	// https://github.com/flutter/flutter/issues/109474

	int _portCounter = 8080;

	/// Finds the next available local port.
	Future<int> findAvailablePortAndPossiblyCauseFlakyTests() async {
	while (!await _isPortAvailable(_portCounter)) {
	_portCounter += 1;
	}
	return _portCounter++;
	}

	Future<bool> _isPortAvailable(int port) async {
	try {
	final RawSocket socket = await RawSocket.connect('localhost', port);
	socket.shutdown(SocketDirection.both);
	await socket.close();
	return false;
	} on SocketException {
	return true;
	}
	}