feat(fl_query_connectivity_plus_adapter): lookup based offline detection

2023-10-14 14:42:12 +06:00
parent 3e3047ffd4
commit 363404f9ed
5 changed files with 169 additions and 23 deletions
@@ -0,0 +1,74 @@
+import 'dart:async';
+
+import 'package:connectivity_plus/connectivity_plus.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:fl_query_connectivity_plus_adapter/lookups/connection_lookup_io.dart'
+    if (dart.library.html) 'package:fl_query_connectivity_plus_adapter/lookups/connection_lookup_web.dart';
+
+abstract class ConnectionLookup {
+  Future<bool> doesConnectTo(String address);
+  Future<bool> isVpnActive();
+}
+
+class InternetConnectivityChecker
+    with WidgetsBindingObserver, ConnectionLookupMixin {
+  final StreamController<bool> controller;
+
+  bool _wasConnected = true;
+
+  bool get isAppPaused =>
+      WidgetsBinding.instance.lifecycleState == AppLifecycleState.paused;
+
+  InternetConnectivityChecker(Duration duration)
+      : controller = StreamController<bool>.broadcast() {
+    Timer.periodic(duration, (timer) async {
+      if (isAppPaused) {
+        return;
+      }
+      await hasConnection();
+    });
+    Connectivity().onConnectivityChanged.listen((event) async {
+      if (isAppPaused) {
+        return;
+      }
+      await hasConnection();
+    });
+  }
+
+  @override
+  didChangeAppLifecycleState(AppLifecycleState state) async {
+    if (state == AppLifecycleState.resumed) {
+      await hasConnection();
+    }
+  }
+
+  Future<bool> hasConnection() async {
+    final connectivityResult = await (Connectivity().checkConnectivity());
+    final hasNetwork = [
+      ConnectivityResult.mobile,
+      ConnectivityResult.wifi,
+      ConnectivityResult.ethernet,
+    ].contains(connectivityResult);
+
+    final isVpn =
+        connectivityResult == ConnectivityResult.vpn || await isVpnActive();
+
+    final connected = hasNetwork
+        ? kIsWeb
+            ? await doesConnectTo('/favicon.ico') ||
+                await doesConnectTo('/favicon.png') ||
+                await doesConnectTo('/favicon.gif')
+            : await doesConnectTo('google.com') ||
+                await doesConnectTo('www.baidu.com')
+        : isVpn;
+
+    if (connected != _wasConnected) {
+      _wasConnected = connected;
+      controller.add(connected);
+    }
+    return connected;
+  }
+
+  Stream<bool> get onConnectionChanged => controller.stream;
+}