Empty log file in real device ?

[Chachuke]

Hello everyone,

I am using the Logger package for the logs in my mobile application (iOS & Android).

I have implemented a LoggerHelper as it :

import 'dart:async';
import 'package:logger/logger.dart';
import 'package:abc/main.dart';

class LoggerHelper {
  final int maxFileSizeKB = 1024;
  final int maxRotatedFilesCount = 5;
  static Level _logLevel = Level.info;

  Logger? _loggerInstance;

  LoggerHelper() {
    _loggerInstance = Logger(
      printer: SimplePrinter(
        printTime: true,
        colors: false,
      ),
      level: _logLevel,
      output: MultiOutput([
        AdvancedFileOutput(
          path: logDir.path,
          maxFileSizeKB: maxFileSizeKB,
          maxRotatedFilesCount: maxRotatedFilesCount,
          maxDelay: const Duration(seconds: 1),
        ),
        ConsoleOutput(),
      ]),
    );
  }

  Future<void> setLogLevel(Level level) async {
    _logLevel = level;
  }

  Level getLogLevel() {
    return _logLevel;
  }

  void trace(String message) {
    _loggerInstance?.t(message);
  }

  void debug(String message) {
    _loggerInstance?.d(message);
  }

  void info(String message) {
    _loggerInstance?.i(message);
  }

  void warning(String message) {
    _loggerInstance?.w(message);
  }

  void error(String message, [dynamic error]) {
    _loggerInstance?.e(message, error: error, stackTrace: StackTrace.current);
  }
}

Then I start directly by calling this function in my main :

Future<void> _initializeLogger() async {
  WidgetsFlutterBinding.ensureInitialized();
  final directory = await getApplicationDocumentsDirectory();
  logDir = Directory('${directory.path}/logs');

  if (!logDir.existsSync()) {
    logDir.createSync(recursive: true);
  }

  final info = await PackageInfo.fromPlatform();
  LoggerHelper().info('-- Booting Application -- ');
  LoggerHelper().info('With Version: ${info.version} - ${info.buildNumber}');
}

When i am running my app in simulators ( ios or android ), everything logs fine, and i can zip the file and export it and all the logs are written in the files.
But when using a real device i can't see any logs in the console and the files always empty.

Do you know what i am doing wrong or if i am missing something ?

Thanks in advance.

[Bungeefan]

Hi, it seems like you are missing a LogFilter: #43 (comment).

[Chachuke]

Thank you, that's exactly what I was missing !

I implemented it as is:

import 'package:logger/logger.dart';

class CustomLogFilter extends LogFilter {
  Level logLevel;

  CustomLogFilter(this.logLevel);

  @override
  bool shouldLog(LogEvent event) {
    return event.level.index >= logLevel.index;
  }
}

[Bungeefan]

You're welcome!

BTW: You don't even have to create a custom filter, if you don't need any custom handling. You can just use the provided ProductionFilter :)