feat: 4423 - new "server down" message after a ping attempt

Impacted files:
* `fetched_product.dart`: added field `failedPingedHost` where we store the host that we couldn't ping
* `generated_plugin_registrant.cc`: wtf
* `generated_plugins.cmake`: wtf
* `GeneratedPluginRegistrant.swift`: wtf
* `main.dart`: registered `DartPingIOS`
* `product_refresher.dart`: now trying to ping the server if exception and connection
* `pubspec.lock`: wtf
* `pubspec.yaml: added packages `dart_ping` and `dart_ping_ios`

packages/smooth_app/lib/data_models/fetched_product.dart

@@ -18,6 +18,7 @@ class FetchedProduct {
     this.product,
     this.connectivityResult,
     this.exceptionString,
+    this.failedPingedHost,
   });
 
   // The reason behind the "ignore": I want to force "product" to be not null
@@ -40,15 +41,23 @@ class FetchedProduct {
   const FetchedProduct.error({
     required final String exceptionString,
     required final ConnectivityResult connectivityResult,
+    final String? failedPingedHost,
   }) : this._(
           status: FetchedProductStatus.internetError,
           connectivityResult: connectivityResult,
           exceptionString: exceptionString,
+          failedPingedHost: failedPingedHost,
         );
 
   final Product? product;
   final FetchedProductStatus status;
+
+  /// When relevant, result of the connectivity check.
   final ConnectivityResult? connectivityResult;
+
+  /// When relevant, string of the exception.
   final String? exceptionString;
-  // TODO(monsieurtanuki): add a "ping" action in order to check if the server is alive?
+
+  /// When relevant, host of the query that we couldn't even ping.
+  final String? failedPingedHost;
 }

packages/smooth_app/lib/main.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:io';
 
 import 'package:app_store_shared/app_store_shared.dart';
+import 'package:dart_ping_ios/dart_ping_ios.dart';
 import 'package:device_preview/device_preview.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
@@ -120,6 +121,7 @@ Future<bool> _init1() async {
     return false;
   }
 
+  DartPingIOS.register();
   await SmoothServices().init(GlobalVars.appStore);
   await setupAppNetworkConfig();
   await UserManagementProvider.mountCredentials();

packages/smooth_app/lib/pages/product/common/product_refresher.dart

@@ -1,4 +1,5 @@
 import 'package:connectivity_plus/connectivity_plus.dart';
+import 'package:dart_ping/dart_ping.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:flutter_svg/svg.dart';
@@ -147,6 +148,9 @@ class ProductRefresher {
                   ConnectivityResult.none) {
                 return 'You are not connected to the internet!';
               }
+              if (fetchAndRefreshed.failedPingedHost != null) {
+                return 'Server down (${fetchAndRefreshed.failedPingedHost})';
+              }
               return 'Server error (${fetchAndRefreshed.exceptionString})';
           }
         }
@@ -188,9 +192,22 @@ class ProductRefresher {
       Logs.e('Refresh from server error', ex: e);
       final ConnectivityResult connectivityResult =
           await Connectivity().checkConnectivity();
+      if (connectivityResult == ConnectivityResult.none) {
+        return FetchedProduct.error(
+          exceptionString: e.toString(),
+          connectivityResult: connectivityResult,
+        );
+      }
+      // TODO(monsieurtanuki): make things cleaner with off-dart
+      final String host =
+          OpenFoodAPIConfiguration.globalQueryType == QueryType.PROD
+              ? OpenFoodAPIConfiguration.uriProdHost
+              : OpenFoodAPIConfiguration.uriTestHost;
+      final PingData result = await Ping(host, count: 1).stream.first;
       return FetchedProduct.error(
         exceptionString: e.toString(),
         connectivityResult: connectivityResult,
+        failedPingedHost: result.error == null ? null : host,
       );
     }
   }

packages/smooth_app/macos/Flutter/GeneratedPluginRegistrant.swift

@@ -6,6 +6,7 @@ import FlutterMacOS
 import Foundation
 
 import audioplayers_darwin
+import connectivity_plus
 import device_info_plus
 import file_selector_macos
 import flutter_secure_storage_macos
@@ -22,6 +23,7 @@ import url_launcher_macos
 
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   AudioplayersDarwinPlugin.register(with: registry.registrar(forPlugin: "AudioplayersDarwinPlugin"))
+  ConnectivityPlugin.register(with: registry.registrar(forPlugin: "ConnectivityPlugin"))
   DeviceInfoPlusMacosPlugin.register(with: registry.registrar(forPlugin: "DeviceInfoPlusMacosPlugin"))
   FileSelectorPlugin.register(with: registry.registrar(forPlugin: "FileSelectorPlugin"))
   FlutterSecureStorageMacosPlugin.register(with: registry.registrar(forPlugin: "FlutterSecureStorageMacosPlugin"))

packages/smooth_app/pubspec.lock

@@ -357,6 +357,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.5"
+  dart_ping:
+    dependency: "direct main"
+    description:
+      name: dart_ping
+      sha256: dd3a93d9b986565cb2fadd0c9277cf9880298634ccc9588e353e63c6f736a386
+      url: "https://pub.dev"
+    source: hosted
+    version: "9.0.0"
+  dart_ping_ios:
+    dependency: "direct main"
+    description:
+      name: dart_ping_ios
+      sha256: ba60bcd1ef8f13d564e9490197fb32c34d38fd1c10a890143a52f5b71d82ea95
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.0"
   dart_style:
     dependency: transitive
     description:
@@ -541,6 +557,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.0.1"
+  flutter_icmp_ping:
+    dependency: transitive
+    description:
+      name: flutter_icmp_ping
+      sha256: a06c2255a857c8f9d1b0a68f546b113557e48e7a543f91e38bd66aeab296f3a6
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.2"
   flutter_image_compress:
     dependency: "direct main"
     description:

packages/smooth_app/pubspec.yaml

@@ -70,6 +70,9 @@ dependencies:
   webview_flutter: 3.0.4
   flutter_custom_tabs: ^1.0.4
   flutter_image_compress: 2.0.4
+  connectivity_plus: ^4.0.2
+  dart_ping: 9.0.0
+  dart_ping_ios: 4.0.0
 
   # According to the build variant, only one "app store" implementation must be added when building a release
   # Call "flutter pub remove xxxx" to remove unused dependencies
@@ -96,11 +99,7 @@ dependencies:
   scanner_zxing:
     path: ../scanner/zxing
 
-
-
-
   openfoodfacts: 2.7.4
-  connectivity_plus: ^4.0.2
   # openfoodfacts:
   #   path: ../../../openfoodfacts-dart
 

packages/smooth_app/windows/flutter/generated_plugin_registrant.cc

@@ -7,6 +7,7 @@
 #include "generated_plugin_registrant.h"
 
 #include <audioplayers_windows/audioplayers_windows_plugin.h>
+#include <connectivity_plus/connectivity_plus_windows_plugin.h>
 #include <file_selector_windows/file_selector_windows.h>
 #include <flutter_secure_storage_windows/flutter_secure_storage_windows_plugin.h>
 #include <permission_handler_windows/permission_handler_windows_plugin.h>
@@ -18,6 +19,8 @@
 void RegisterPlugins(flutter::PluginRegistry* registry) {
   AudioplayersWindowsPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("AudioplayersWindowsPlugin"));
+  ConnectivityPlusWindowsPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("ConnectivityPlusWindowsPlugin"));
   FileSelectorWindowsRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("FileSelectorWindows"));
   FlutterSecureStorageWindowsPluginRegisterWithRegistrar(

packages/smooth_app/windows/flutter/generated_plugins.cmake

@@ -4,6 +4,7 @@
 
 list(APPEND FLUTTER_PLUGIN_LIST
   audioplayers_windows
+  connectivity_plus
   file_selector_windows
   flutter_secure_storage_windows
   permission_handler_windows