Merge pull request #2 from vijayinyoutube/refactor

refactor

Author: vijayinyoutube

lib/Business_Logic/Exceptions/exception_handlers.dart

@@ -0,0 +1,59 @@
+import 'package:flutter/material.dart';
+
+import '../../Presentation/Components/snack_bar.dart';
+
+enum ExceptionTypes {
+  socketException,
+  httpException,
+  formatException,
+  timeoutException
+}
+
+class ExceptionHandlers {
+  String typeOfException(ExceptionTypes exceptionTypes) {
+    switch (exceptionTypes) {
+      case ExceptionTypes.socketException:
+        return 'No internet connection.';
+      case ExceptionTypes.httpException:
+        return 'HTTP error occured.';
+      case ExceptionTypes.formatException:
+        return 'Invalid data format.';
+      case ExceptionTypes.timeoutException:
+        return 'Request timeout.';
+    }
+  }
+}
+
+class AppException implements Exception {
+  final String? message;
+  final String? prefix;
+  final String? url;
+
+  AppException([this.message, this.prefix, this.url]);
+}
+
+class BadRequestException extends AppException {
+  BadRequestException([String? message, String? url])
+      : super(message, 'Bad request', url);
+}
+
+class FetchDataException extends AppException {
+  FetchDataException([String? message, String? url])
+      : super(message, 'Unable to process the request', url);
+}
+
+class ApiNotRespondingException extends AppException {
+  ApiNotRespondingException([String? message, String? url])
+      : super(message, 'Api not responding', url);
+}
+
+class UnAuthorizedException extends AppException {
+  UnAuthorizedException([String? message, String? url])
+      : super(message, 'Unauthorized request', url);
+}
+
+class NotFoundException extends AppException {
+  NotFoundException([String? message, String? url])
+      : super(message, 'Page not found', url);
+}
+

lib/Data/API/base_client.dart

@@ -0,0 +1,70 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import '../../Business_Logic/Exceptions/exception_handlers.dart';
+import 'package:http/http.dart' as http;
+
+class BaseClient {
+  static const int timeOutDuration = 35;
+
+  //GET
+  Future<dynamic> get(String url) async {
+    var uri = Uri.parse(url);
+    try {
+      var response =
+          await http.get(uri).timeout(const Duration(seconds: timeOutDuration));
+      return _processResponse(response);
+    } on SocketException {
+      throw const SocketException('Socket exception');
+    } on TimeoutException {
+      throw ApiNotRespondingException('Server not responding.');
+    } on FormatException {
+    } on HttpException {
+    } catch (e) {
+      throw e.toString();
+    }
+  }
+
+  //POST
+  Future<dynamic> post(String url, dynamic payloadObj) async {
+    var uri = Uri.parse(url);
+    var payload = jsonEncode(payloadObj);
+    try {
+      var response = await http
+          .post(uri, body: payload)
+          .timeout(const Duration(seconds: timeOutDuration));
+
+      return _processResponse(response);
+    } on SocketException {
+    } on TimeoutException {
+      throw ApiNotRespondingException('Server not responding.');
+    } on FormatException {
+    } on HttpException {}
+  }
+
+  //DELETE
+  //OTHERS
+
+//----------------------ERROR STATUS CODES----------------------
+
+  dynamic _processResponse(http.Response response) {
+    switch (response.statusCode) {
+      case 200:
+        var responseJson = response.body;
+        return responseJson;
+      case 400: //Bad request
+        throw BadRequestException(response.body);
+      case 401: //Unauthorized
+        throw UnAuthorizedException(response.body);
+      case 403: //Forbidden
+        throw UnAuthorizedException(response.body);
+      case 404: //Resource Not Found
+        throw NotFoundException(response.body);
+      case 500: //Internal Server Error
+      default:
+        throw FetchDataException(
+            'Something went wrong! ${response.statusCode}');
+    }
+  }
+}

lib/Data/Models/home_page_model.dart

@@ -1,26 +1,26 @@
 // ignore_for_file: public_member_api_docs, sort_constructors_first
 import 'dart:convert';
 
-class DemoMode {
-  final String userId;
-  final String id;
+class DemoModel {
+  final int userId;
+  final int id;
   final String title;
   final bool completed;
 
-  DemoMode(
+  DemoModel(
     this.userId,
     this.id,
     this.title,
     this.completed,
   );
 
-  DemoMode copyWith({
-    String? userId,
-    String? id,
+  DemoModel copyWith({
+    int? userId,
+    int? id,
     String? title,
     bool? completed,
   }) {
-    return DemoMode(
+    return DemoModel(
       userId ?? this.userId,
       id ?? this.id,
       title ?? this.title,
@@ -37,30 +37,30 @@ class DemoMode {
     };
   }
 
-  factory DemoMode.fromMap(Map<String, dynamic> map) {
-    return DemoMode(
-      map['userId'] as String,
-      map['id'] as String,
+  factory DemoModel.fromMap(Map<String, dynamic> map) {
+    return DemoModel(
+      map['userId'] as int,
+      map['id'] as int,
       map['title'] as String,
       map['completed'] as bool,
     );
   }
 
   String toJson() => json.encode(toMap());
 
-  factory DemoMode.fromJson(String source) =>
-      DemoMode.fromMap(json.decode(source) as Map<String, dynamic>);
+  factory DemoModel.fromJson(String source) =>
+      DemoModel.fromMap(json.decode(source) as Map<String, dynamic>);
 
   @override
   String toString() {
-    return 'DemoMode(userId: $userId, id: $id, title: $title, completed: $completed)';
+    return 'DemoModel(userId: $userId, id: $id, title: $title, completed: $completed)';
   }
 
   @override
   bool operator ==(Object other) {
     if (identical(this, other)) return true;
 
-    return other is DemoMode &&
+    return other is DemoModel &&
         other.userId == userId &&
         other.id == id &&
         other.title == title &&

lib/Data/Repository/home_page_repo.dart

@@ -1,30 +1,22 @@
-import 'package:api_exceptions_part2/Presentation/Screens/HomePage/UI/home_page.dart';
-import 'package:flutter/material.dart';
+import '../../Business_Logic/Exceptions/exception_handlers.dart';
+import '../API/base_client.dart';
+import '../Models/home_page_model.dart';
+import 'package:flutter_dotenv/flutter_dotenv.dart';
 
-class RouteGenerator {
-  Route<dynamic> generateRoute(RouteSettings settings) {
-    final args = settings.arguments;
-    print(args.hashCode);
-    switch (settings.name) {
-      case '/':
-        return MaterialPageRoute(
-            builder: (_) => const MyHomePage(title: 'API & Exceptions'));
-
-      default:
-        return _errorRoute();
-    }
-  }
+abstract class DemoRepository {
+  Future<DemoModel> fetchData();
+}
 
-  static Route<dynamic> _errorRoute() {
-    return MaterialPageRoute(builder: (_) {
-      return Scaffold(
-        appBar: AppBar(
-          title: const Text('Error'),
-        ),
-        body: const Center(
-          child: Text('ERROR'),
-        ),
-      );
-    });
+class DemoRepo extends DemoRepository {
+  @override
+  Future<DemoModel> fetchData() async {
+   try{
+      final response =
+        await BaseClient().get('${(dotenv.env['API_BASE_URL'])}/todos/1');
+    return DemoModel.fromJson(response);
+   }
+   catch(e){
+     throw e.toString();
+   }
   }
 }

lib/Presentation/Components/snack_bar.dart

@@ -0,0 +1,4 @@
+import 'package:flutter/material.dart';
+
+ScaffoldFeatureController buildSnackBar(context, data) =>
+    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(data)));

lib/Presentation/Routes/generated_routes.dart

@@ -0,0 +1,29 @@
+import '../../Presentation/Screens/HomePage/UI/home_page.dart';
+import 'package:flutter/material.dart';
+
+class RouteGenerator {
+  Route<dynamic> generateRoute(RouteSettings settings) {
+    final args = settings.arguments;
+    switch (settings.name) {
+      case '/':
+        return MaterialPageRoute(
+            builder: (_) => const MyHomePage(title: 'API & Exceptions'));
+
+      default:
+        return _errorRoute();
+    }
+  }
+
+  static Route<dynamic> _errorRoute() {
+    return MaterialPageRoute(builder: (_) {
+      return Scaffold(
+        appBar: AppBar(
+          title: const Text('Error'),
+        ),
+        body: const Center(
+          child: Text('ERROR'),
+        ),
+      );
+    });
+  }
+}

lib/Presentation/Screens/HomePage/UI/home_page.dart

@@ -1,3 +1,4 @@
+import 'package:api_exceptions_part2/Data/Repository/home_page_repo.dart';
 import 'package:flutter/material.dart';
 
 class MyHomePage extends StatefulWidget {
@@ -16,6 +17,21 @@ class _MyHomePageState extends State<MyHomePage> {
       appBar: AppBar(
         title: Text(widget.title),
       ),
+      body: Center(
+          child: ElevatedButton(
+        onPressed: () => getData(),
+        child: const Text('Fetch Data'),
+      )),
     );
   }
+
+  Future<void> getData() async {
+    print('getting data');
+    try {
+      var response = await DemoRepo().fetchData();
+      print(response);
+    } catch (e) {
+      print(e.toString());
+    }
+  }
 }

lib/main.dart

@@ -1,9 +1,10 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_dotenv/flutter_dotenv.dart';
 
-import 'Data/Repository/home_page_repo.dart';
-import 'Presentation/Screens/HomePage/UI/home_page.dart';
+import 'Presentation/Routes/generated_routes.dart';
 
-void main() {
+Future<void> main() async {
+  await dotenv.load();
   runApp(const MyApp());
 }
 
@@ -13,6 +14,7 @@ class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
+      debugShowCheckedModeBanner: false,
       title: 'Flutter API Exceptions',
       theme: ThemeData(
         primarySwatch: Colors.blue,

pubspec.lock

@@ -81,6 +81,20 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  http:
+    dependency: "direct main"
+    description:
+      name: http
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.13.4"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.0.1"
   lints:
     dependency: transitive
     description:
@@ -163,6 +177,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.4.9"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.1"
   vector_math:
     dependency: transitive
     description:

pubspec.yaml

@@ -35,6 +35,7 @@ dependencies:
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.2
   flutter_dotenv: ^5.0.2
+  http: ^0.13.4
 
 dev_dependencies:
   flutter_test:
@@ -59,8 +60,8 @@ flutter:
   uses-material-design: true
 
   # To add assets to your application, add an assets section, like this:
-  # assets:
-  #   - images/a_dot_burr.jpeg
+  assets:
+    - .env
   #   - images/a_dot_ham.jpeg
 
   # An image asset can refer to one or more resolution-specific "variants", see