Add File Logger

lib/logs/file.dart

@@ -0,0 +1,103 @@
+import 'dart:io' as io;
+import 'package:file/file.dart';
+import 'package:file/local.dart';
+import 'package:logging/logging.dart';
+import 'package:path/path.dart' as path;
+import 'package:path_provider/path_provider.dart';
+import '../globals.dart';
+import '../utils.dart';
+
+class LogsFile {
+  LogsFile();
+  Directory? _cachedLogDirectory;
+  FileSystem fs = const LocalFileSystem();
+  DateTime? _startTime;
+  DateTime? _endTime;
+  File? _cachedFile;
+  IOSink? _cached;
+  Future<void> init() async {
+    if (_cachedLogDirectory != null) return;
+    if (isWindows) {
+      try {
+        final p = await platformPath.getCurrentExe();
+        if (p != null) {
+          final dir = fs.directory(path.join(path.dirname(p), "logs"));
+          if (!(await dir.exists())) {
+            await dir.create(recursive: true);
+          }
+          _cachedLogDirectory = dir;
+          return;
+        }
+      } catch (e) {
+        // Do nothing
+      }
+    }
+    final io.Directory appSupportDir = await getApplicationSupportDirectory();
+    final dir = fs.directory(path.join(appSupportDir.path, "logs"));
+    if (!(await dir.exists())) {
+      await dir.create(recursive: true);
+    }
+    _cachedLogDirectory = dir;
+    final d = _file(DateTime.now());
+    if (d == null) {
+      throw Exception("Failed to create log file.");
+    }
+    return;
+  }
+
+  IOSink? _file(DateTime now) {
+    if (_cached != null &&
+        _cachedFile != null &&
+        _startTime != null &&
+        _endTime != null) {
+      if (now.isAfter(_startTime!) && now.isBefore(_endTime!)) {
+        return _cached;
+      }
+    }
+    if (_cached != null) {
+      _cached!.close();
+    }
+    final dir = _cachedLogDirectory;
+    if (dir == null) return null;
+    final n = now.isUtc ? now.toLocal() : now;
+    final year = n.year.toString().padLeft(4, '0');
+    final month = n.month.toString().padLeft(2, '0');
+    final day = n.day.toString().padLeft(2, '0');
+    final f = dir.childFile("$year-$month-$day.log");
+    if (!f.existsSync()) {
+      f.createSync(recursive: true);
+    }
+    _cachedFile = f;
+    _cached = f.openWrite(mode: FileMode.append);
+    _startTime = DateTime(n.year, n.month, n.day);
+    _endTime = _startTime!.add(const Duration(days: 1));
+    return _cached;
+  }
+
+  bool log(LogRecord record) {
+    final stack = record.stackTrace != null ? '\n${record.stackTrace}' : '';
+    final error = record.error != null ? '${record.error}' : '';
+    final t = record.time;
+    final hour = t.hour.toString().padLeft(2, '0');
+    final minute = t.minute.toString().padLeft(2, '0');
+    final second = t.second.toString().padLeft(2, '0');
+    final millisecond = t.millisecond.toString().padLeft(3, '0');
+    final time = "$hour:$minute:$second.$millisecond";
+    final logText =
+        '${record.level.name}: ${record.loggerName}: $time: ${record.message}$error$stack';
+    try {
+      final file = _file(record.time);
+      if (file == null) {
+        return false;
+      }
+      file.write("$logText\n");
+      return true;
+    } catch (_) {
+      return false;
+    }
+  }
+
+  Future<void> flush() async {
+    await _cached?.flush();
+  }
+}

lib/main.dart

@@ -9,6 +9,7 @@ import 'package:window_manager/window_manager.dart';
 import 'globals.dart';
 import 'home.dart';
 import 'login.dart';
+import 'logs/file.dart';
 import 'set_server.dart';
 import 'utils.dart';
 
@@ -29,17 +30,33 @@ final _router = GoRouter(
   ],
 );
 
+void defaultLogger(LogRecord record) {
+  final stack = record.stackTrace != null ? '\n${record.stackTrace}' : '';
+  final error = record.error != null ? '${record.error}' : '';
+  // ignore: avoid_print
+  print(
+      '${record.level.name}: ${record.loggerName}: ${record.time}: ${record.message}$error$stack');
+}
+
 Future<void> initLogger() async {
   var logLevel = prefs.getInt("logLevel");
   var logLevelName = prefs.getString("logLevelName");
   if (logLevel != null && logLevelName != null) {
     Logger.root.level = Level(logLevelName, logLevel);
   }
-  Logger.root.onRecord.listen((record) {
-    final stack = record.stackTrace != null ? '\n${record.stackTrace}' : '';
-    print(
-        '${record.level.name}: ${record.time}: ${record.message}${record.error}$stack');
-  });
+  if (!kIsWeb) {
+    try {
+      final logFile = LogsFile();
+      await logFile.init();
+      Logger.root.onRecord.listen((record) {
+        if (!logFile.log(record)) defaultLogger(record);
+      });
+      return;
+    } catch (_) {
+      // Do nothing
+    }
+  }
+  Logger.root.onRecord.listen(defaultLogger);
   return;
 }