Flutter日志管理插件logdna的使用

LogDNA是一个强大的日志管理平台，它能够与多个平台集成，并提供集中化的日志管理功能，如分析、监控、过滤和告警等。本文将介绍如何在Flutter项目中使用logdna插件来管理和发送日志。

快速入门

首先，你需要在LogDNA官网创建一个账户并获取你的ingestion API key。详细的设置过程可以参考快速启动指南。

安装插件

在你的Flutter项目的pubspec.yaml文件中添加以下依赖：

dependencies:
  logdna: ^1.1.2

然后运行以下命令安装依赖：

flutter pub get

使用方法

首先，在Dart代码中导入logdna包：

import 'package:logdna/logdna.dart';

接着，实例化LogDna对象：

final logDna = LogDNA(
    apiKey: "YOUR_API_KEY",
    hostName: "HOSTNAME");

你可以通过logDna对象添加日志记录：

logDna.log(DnaLine(
      timestamp: DateTime.now().toUtc().millisecondsSinceEpoch.toString(),
      line: "event happened",
      level: DnaLevel.debug,
      app: "APP NAME",
      env: DnaEnv.production,
      meta: {
        "custom field": "custom value",
        "custom field 2": "custom value 2"
      }
    ));

你也可以先创建一个DnaLine实例，然后再传递给log方法：

final line = DnaLine(
      timestamp: DateTime.now().toUtc().millisecondsSinceEpoch.toString(),
      line: "event happened",
      level: DnaLevel.debug,
      app: "APP NAME",
      env: DnaEnv.production,
      meta: {
        "custom field": "custom value",
        "custom field 2": "custom value 2"
      }
    );

// 添加自定义字段
line.addCustomField(CustomField(name: "custom name", value: "Custom value"));

// 发送日志
logDna.log(line);

示例Demo

以下是一个完整的Flutter应用示例，展示如何使用logdna插件进行日志记录：

import 'package:flutter/material.dart';
import 'package:logdna/logdna.dart';
import 'package:logdna/models/dna_line.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Logdna Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Logdna Demo Home Page', key: UniqueKey()),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({required Key key, required this.title}) : super(key: key);

  final String title;

  [@override](/user/override)
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  late LogDNA logDna;
  int _counter = 0;

  [@override](/user/override)
  void initState() { 
    super.initState();
    logDna = LogDNA(
      apiKey: "YOUR_API_KEY",
      hostName: "HOSTNAME");
  }

  void _incrementCounter() {
    logDna.log(DnaLine(
      timestamp: DateTime.now().toUtc().millisecondsSinceEpoch.toString(),
      line: "counter incremented",
      level: DnaLevel.debug,
      env: DnaEnv.production,
      meta: {
        "custom field": "custom value"
      }
    ));

    setState(() {
      _counter++;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}