app-zj/lib/network/base_dio.dart

import 'package:connectivity_plus/connectivity_plus.dart';
import 'package:dio/dio.dart';
import 'package:flutter_smart_dialog/flutter_smart_dialog.dart';
import 'package:lszlgl/main.dart';
import 'package:lszlgl/service/user_service.dart';

class BaseDio {
  static BaseDio? _instance;

  static BaseDio get() => _instance ??= BaseDio._();

  BaseDio._() {
    BaseOptions options = BaseOptions();

    dio = Dio(options);

    // 添加request拦截器
    dio.interceptors.add(MyInterceptor());
    // // 添加error拦截器
    // dio.interceptors.add(ErrorInterceptor());
    // // // 添加cache拦截器
    // dio.interceptors.add(NetCacheInterceptor());
    // // // 添加retry拦截器
    // dio.interceptors.add(
    //   RetryOnConnectionChangeInterceptor(
    //     requestRetrier: DioConnectivityRequestRetrier(
    //       dio: dio,
    //       connectivity: Connectivity(),
    //     ),
    //   ),
    // );
  }

  late final Dio dio;

  /// 初始化公共属性
  /// * [baseUrl] 前缀地址
  /// * [receiveTimeout] 接收超出时间
  /// * [connectTimeout] 连接超时时间
  /// * [sendTimeout] 发送超时时间
  void init({
    String? baseUrl,
    Duration? receiveTimeout = const Duration(seconds: 60),
    Duration? connectTimeout = const Duration(seconds: 30),
    Duration? sendTimeout = const Duration(seconds: 60),
    Map<String, String>? headers,
    List<Interceptor>? interceptors,
  }) {
    dio.options.copyWith(
      baseUrl: baseUrl,
      connectTimeout: connectTimeout,
      receiveTimeout: receiveTimeout,
      sendTimeout: sendTimeout,
      headers: headers,
    );
    if (interceptors != null && interceptors.isNotEmpty) {
      dio.interceptors.addAll(interceptors);
    }
  }
}

/// 拦截器
class MyInterceptor extends Interceptor {
  @override
  void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
    // 请求
    var login = UserService.get().getLogin();
    if (login != null) {
      // 已登录添加token
      options.headers['Authorization'] = 'Bearer ${login.accessToken}';
    }
    Map<String, Object?> map = {};
    map['url'] = options.uri;
    map['method'] = options.method;
    map['headers'] = options.headers;
    map['data'] = options.data;
    if (options.queryParameters.isNotEmpty) map['queryParameters'] = options.queryParameters;
    if (options.extra.isNotEmpty) map['extra'] = options.extra;
    logger.i('ApiRequest: $map');
    handler.next(options);
  }

  @override
  void onResponse(Response response, ResponseInterceptorHandler handler) {
    // 响应
    Map<String, Object?> map = {};
    map['url'] = response.requestOptions.uri;
    map['statusCode'] = response.statusCode;
    map['statusMessage'] = response.statusMessage;
    if (response.data != null) {
      var code = response.data!['code'];
      var msg = response.data!['msg'];
      map['code'] = code;
      map['msg'] = msg;
      map['data'] = response.data!['data'];
      if (code != 0) {
        return handler.reject(
          DioException(
            requestOptions: response.requestOptions,
            response: response,
            type: DioExceptionType.badResponse,
            message: msg,
          ),
          true,
        );
      }
    }
    if (response.extra.isNotEmpty) map['extra'] = response.extra;
    logger.i('ApiResponse: $map');
    handler.next(response);
  }

  // 是否有网
  Future<bool> isConnected() async {
    var connectivityResult = await (Connectivity().checkConnectivity());
    return connectivityResult != ConnectivityResult.none;
  }

  @override
  void onError(DioException err, ErrorInterceptorHandler handler) async {
    // 增加网络检测
    if (err.type == DioExceptionType.unknown) {
      bool isConnectNetWork = await isConnected();
      if (!isConnectNetWork) {
        err.copyWith(message: '当前网络不可用，请检查您的网络');
      }
    }
    // error统一处理
    AppException appException = AppException.create(err);
    err.copyWith(error: appException);
    // 响应
    Map<String, Object?> map = {};
    map['url'] = err.requestOptions.uri;
    map['statusCode'] = err.response?.statusCode;
    map['data'] = err.response?.data;
    map['msg'] = appException.message;
    if (err.response?.extra.isNotEmpty ?? false) map['extra'] = err.response?.extra;
    logger.e('ApiError: $map');
    SmartDialog.showToast(appException.message ?? '');
    handler.next(err);
  }
}

/// 自定义异常
class AppException implements Exception {
  final String? message;
  final int code;

  AppException(
    this.code,
    this.message,
  );

  @override
  String toString() {
    return 'code:$code, message:$message';
  }

  factory AppException.create(DioException error) {
    switch (error.type) {
      case DioExceptionType.connectionTimeout:
        return AppException(-1, '连接超时');
      case DioExceptionType.sendTimeout:
        return AppException(-1, '请求超时');
      case DioExceptionType.receiveTimeout:
        return AppException(-1, '响应超时');
      case DioExceptionType.badCertificate:
        return AppException(-1, '证书错误');
      case DioExceptionType.badResponse:
        var code = error.response?.data['code'];
        if (code == 401) UserService.get().logout();
        return AppException(code, error.response?.data['msg'] ?? '');
      case DioExceptionType.cancel:
        return AppException(-1, "请求取消");
      case DioExceptionType.connectionError:
        return AppException(-1, '连接超时');
      case DioExceptionType.unknown:
        return AppException(-1, error.message);
    }
  }
}