[mixin_logger] add setLoggerFileLeading api

Author: boyan01

packages/mixin_logger/lib/mixin_logger.dart

@@ -84,6 +84,10 @@ Future<void> initLogger(
   await platform.initLogger(logDir, maxFileCount, maxFileLength, fileLeading);
 }
 
+void setLoggerFileLeading(String? leading) {
+  platform.setLoggerFileLeading(leading);
+}
+
 void v(String message) {
   _print(message, _LogLevel.verbose);
 }

packages/mixin_logger/lib/src/log_file_manager.dart

@@ -8,6 +8,13 @@ import 'dart:ui';
 import 'package:flutter/foundation.dart';
 import 'package:path/path.dart' as p;
 
+@immutable
+class _UpdateFileLeading {
+  const _UpdateFileLeading(this.content);
+
+  final String? content;
+}
+
 abstract class LogFileManager {
   static LogFileManager? _instance;
 
@@ -78,12 +85,18 @@ abstract class LogFileManager {
     messageReceiver.listen((message) {
       if (message is String) {
         logFileHandler.write(message);
+      } else if (message is _UpdateFileLeading) {
+        logFileHandler.fileLeading = message.content;
+      } else {
+        assert(false, 'unknown message: $message');
       }
     });
     responsePort.send(messageReceiver.sendPort);
   }
 
   Future<void> write(String message);
+
+  void setLoggerFileLeading(String? fileLeading);
 }
 
 class _LogFileMangerForOtherIsolate implements LogFileManager {
@@ -95,6 +108,11 @@ class _LogFileMangerForOtherIsolate implements LogFileManager {
   Future<void> write(String message) async {
     _sendPort.send(message);
   }
+
+  @override
+  void setLoggerFileLeading(String? fileLeading) {
+    _sendPort.send(_UpdateFileLeading(fileLeading));
+  }
 }
 
 class _LogFileManagerForLogIsolate implements LogFileManager {
@@ -107,6 +125,11 @@ class _LogFileManagerForLogIsolate implements LogFileManager {
     handler.write(message);
     return Future.value();
   }
+
+  @override
+  void setLoggerFileLeading(String? fileLeading) {
+    handler.fileLeading = fileLeading;
+  }
 }
 
 final _fileNameRegex = RegExp(r'^log_\d+.log$');
@@ -209,7 +232,7 @@ class LogFileHandler {
 
   final int maxFileLength;
 
-  final String? fileLeading;
+  String? fileLeading;
 
   void write(String message) {
     assert(_logFile != null, 'Log file is null');

packages/mixin_logger/lib/src/write_log_to_file_io.dart

@@ -21,3 +21,8 @@ Future<void> initLogger(
     fileLeading: fileLeading,
   );
 }
+
+void setLoggerFileLeading(String? fileLeading) {
+  assert(LogFileManager.instance != null, 'Logger is not initialized');
+  LogFileManager.instance?.setLoggerFileLeading(fileLeading);
+}

packages/mixin_logger/lib/src/write_log_to_file_web.dart

@@ -10,3 +10,5 @@ Future<void> initLogger(
   int maxFileLength,
   String? fileLeading,
 ) async {}
+
+void setLoggerFileLeading(String? fileLeading) {}

packages/mixin_logger/test/mixin_logger_test.dart

@@ -140,7 +140,7 @@ void main() {
   test('write file leading', () async {
     await LogFileManager.init(dir, 10, 200, fileLeading: 'file_leading_test');
 
-    for (var i = 0; i < 100; i++) {
+    for (var i = 0; i < 50; i++) {
       LogFileManager.instance!.write('test $i');
     }
     await Future.delayed(const Duration(milliseconds: 1000));
@@ -150,6 +150,15 @@ void main() {
     expect(fileContent1, startsWith('file_leading_test'));
     final fileContent2 = File(p.join(dir, 'log_2.log')).readAsStringSync();
     expect(fileContent2, startsWith('file_leading_test'));
+    setLoggerFileLeading('new_file_leading');
+    for (var i = 0; i < 50; i++) {
+      LogFileManager.instance!.write('test $i');
+    }
+    await Future.delayed(const Duration(milliseconds: 1000));
+    final fileContent3 = File(p.join(dir, 'log_3.log')).readAsStringSync();
+    expect(fileContent3, startsWith('new_file_leading'));
+    final fileContent4 = File(p.join(dir, 'log_4.log')).readAsStringSync();
+    expect(fileContent4, startsWith('new_file_leading'));
   });
 }