Firebase Firestore 在物理设备上进行 WiFi 故障时出现错误：无法到达 Cloud Firestore 后端

Question

尝试从 Firestore 获取文档时，如果设备通过 Wifi 连接，则连接失败并显示以下错误消息：

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W/Firestore( 4903): (21.4.3) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Backend didn\'t respond within 10 seconds\nW/Firestore( 4903): This typically indicates that your device does not have a healthy Internet connection at the moment. The client will operate in offline mode until it is able to successfully connect to the backend.\n

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重现

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通常，在物理设备中运行时会发生错误。\n我创建了一个小应用程序，以便能够在对其余代码的干扰最小的情况下重现错误。请参阅下面的代码。

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当您在调试器上点击运行（我正在使用 VSCode），然后单击 (+) 按钮向 Firestore 发出请求时，它会尝试几秒钟（您将看到进度指示器，没有测试应用程序），然后调用snapshot = await docRef.get()失败并显示以下错误消息：

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PlatformException(Error performing get, Failed to get document because the client is offline., null)\n

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然后，如果您关闭 wifi，该请求就会完美运行。从 Firestore 检索到的文档内容显示在屏幕中：

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现在，如果你再次打开 wifi，请求就会生效。有时从服务器检索数据，有时从缓存检索数据。

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import \'package:cloud_firestore/cloud_firestore.dart\';\nimport \'package:flutter/material.dart\';\n\nvoid main() {\n  runApp(MyApp());\n}\n\nclass MyApp extends StatelessWidget {\n  @override\n  Widget build(BuildContext context) {\n    return MaterialApp(\n      title: \'Firestore Network Bug\',\n      theme: ThemeData(\n        primarySwatch: Colors.blue,\n        visualDensity: VisualDensity.adaptivePlatformDensity,\n      ),\n      home: MyHomePage(),\n    );\n  }\n}\n\nclass MyHomePage extends StatefulWidget {\n  @override\n  _MyHomePageState createState() => _MyHomePageState();\n}\n\nclass _MyHomePageState extends State<MyHomePage> {\n  bool _loading = false;\n  Map<String, dynamic> _firebaseDocument;\n  String _firebaseError;\n  String _source;\n\n  @override\n  Widget build(BuildContext context) {\n    return Scaffold(\n      appBar: AppBar(\n        title: Text("Firestore Network Bug"),\n      ),\n      body: Padding(\n        padding: const EdgeInsets.all(24),\n        child: Column(\n          mainAxisAlignment: MainAxisAlignment.start,\n          children: <Widget>[\n            Text(\'Tap the (+) button to try to read from Firestore...\',\n                style: TextStyle(fontSize: 20)),\n            _showProgress(),\n            _showResults(),\n            _showErrors(),\n          ],\n        ),\n      ),\n      floatingActionButton: FloatingActionButton(\n        onPressed: _readFromFirebase,\n        tooltip: \'Increment\',\n        child: Icon(Icons.add),\n      ), // This trailing comma makes auto-formatting nicer for build methods.\n    );\n  }\n\n  Widget _showProgress() {\n    return Padding(\n      padding: const EdgeInsets.only(top: 12.0),\n      child: Container(\n        height: 6.0,\n        child: (_loading) ? LinearProgressIndicator() : Container(),\n      ),\n    );\n  }\n\n  Widget _showResults() {\n    return Column(\n      crossAxisAlignment: CrossAxisAlignment.start,\n      children: [\n        SizedBox(height: 12.0),\n        Text("Result:"),\n        Container(\n          height: 150,\n          padding: const EdgeInsets.all(16),\n          color: Colors.blue[100],\n          child: (_firebaseDocument != null)\n              ? Text("From $_source: \\n\\n" + _firebaseDocument?.toString(),\n                  style: TextStyle(fontSize: 16))\n              : Container(),\n        ),\n      ],\n    );\n  }\n\n  Widget _showErrors() {\n    return Column(\n      crossAxisAlignment: CrossAxisAlignment.start,\n      children: [\n        SizedBox(height: 12.0),\n        Text("Errors:"),\n        Container(\n          height: 150,\n          padding: const EdgeInsets.all(16),\n          color: Colors.red[100],\n          child: (_firebaseError != null)\n              ? Text(_firebaseError?.toString(), style: TextStyle(fontSize: 16))\n              : Container(),\n        ),\n      ],\n    );\n  }\n\n  void _readFromFirebase() async {\n    setState(() {\n      _loading = true;\n      _firebaseDocument = null;\n      _firebaseError = null;\n    });\n    DocumentReference docRef =\n        Firestore.instance.document("myCollection/myDocument");\n\n    DocumentSnapshot snapshot = await docRef.get().catchError(\n      (onError) {\n        setState(() {\n          _loading = false;\n          _firebaseDocument = null;\n          _firebaseError = onError.toString();\n        });\n      },\n    );\n    if (_firebaseError != null) return;\n\n    _source = (snapshot.metadata.isFromCache) ? "cache" : "server";\n\n    if (snapshot.exists) {\n      setState(() {\n        _loading = false;\n        _firebaseDocument = snapshot.data;\n      });\n      print("Document found!");\n      print("- ${_firebaseDocument.toString()}");\n    } else {\n      print("Document not found!");\n    }\n  }\n}\n

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预期行为\n由于设备通过 WiFi 具有完美的连接，因此请求工作正常并且从服务器检索了文档。

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其他上下文\n在模拟器上，一切都运行良好。\n我在以下模拟器配置中进行了测试：Pixel 4 API 29、Pixel 5 API 25、Pixel 3 API 29。

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我用来测试的物理设备（均失败）其中：Pixel 4XL（Android 10 QQ3Q.200605.001）和Pixel 3XL（Android 10 QQ2A.200305.002）。

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扑医生

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[\xe2\x9c\x93] Flutter (Channel stable, v1.17.3, on Mac OS X 10.15.4 19E287, locale en-US)\n    \xe2\x80\xa2 Flutter version 1.17.3 at /Users/mlemos/Documents/flutter\n    \xe2\x80\xa2 Framework revision b041144f83 (8 days ago), 2020-06-04 09:26:11 -0700\n    \xe2\x80\xa2 Engine revision ee76268252\n    \xe2\x80\xa2 Dart version 2.8.4\n\n \n[\xe2\x9c\x93] Android toolchain - develop for Android devices (Android SDK version 29.0.2)\n    \xe2\x80\xa2 Android SDK at /Users/mlemos/Library/Android/sdk\n    \xe2\x80\xa2 Platform android-30, build-tools 29.0.2\n    \xe2\x80\xa2 Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java\n    \xe2\x80\xa2 Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)\n    \xe2\x80\xa2 All Android licenses accepted.\n\n[\xe2\x9c\x93] Xcode - develop for iOS and macOS (Xcode 11.5)\n    \xe2\x80\xa2 Xcode at /Applications/Xcode.app/Contents/Developer\n    \xe2\x80\xa2 Xcode 11.5, Build version 11E608c\n    \xe2\x80\xa2 CocoaPods version 1.9.1\n\n[!] Android Studio (version 4.0)\n    \xe2\x80\xa2 Android Studio at /Applications/Android Studio.app/Contents\n    \xe2\x9c\x97 Flutter plugin not installed; this adds Flutter specific functionality.\n    \xe2\x9c\x97 Dart plugin not installed; this adds Dart specific functionality.\n    \xe2\x80\xa2 Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)\n\n[\xe2\x9c\x93] VS Code (version 1.46.0)\n    \xe2\x80\xa2 VS Code at /Applications/Visual Studio Code.app/Contents\n    \xe2\x80\xa2 Flutter extension version 3.11.0\n\n[\xe2\x9c\x93] Connected device (2 available)\n    \xe2\x80\xa2 Pixel 4 XL                \xe2\x80\xa2 99201FFBA000KF \xe2\x80\xa2 android-arm64 \xe2\x80\xa2 Android 10 (API 29)\n    \xe2\x80\xa2 Android SDK built for x86 \xe2\x80\xa2 emulator-5554  \xe2\x80\xa2 android-x86   \xe2\x80\xa2 Android 7.1.1 (API 25) (emulator)\n\n! Doctor found issues in 1 category.\n

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pubspec.yaml

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name: firestore_network_bug\ndescription: A new Flutter project.\npublish_to: \'none\' \nversion: 1.0.0+1\nenvironment:\n  sdk: ">=2.7.0 <3.0.0"\ndependencies:\n  flutter:\n    sdk: flutter\n  cupertino_icons: ^0.1.3\n  firebase_analytics: ^5.0.14\n  cloud_firestore: ^0.13.6\ndev_dependencies:\n  flutter_test:\n    sdk: flutter\nflutter:\n  uses-material-design: true\n

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/build.gradle

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buildscript {\n    ext.kotlin_version = \'1.3.50\'\n    repositories {\n        google()\n        jcenter()\n    }\n\n    dependencies {\n        classpath \'com.android.tools.build:gradle:3.5.0\'\n        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"\n        // Application specific configuration (dependencies)\n        classpath \'com.google.gms:google-services:4.3.3\'\n        classpath \'com.google.firebase:firebase-crashlytics-gradle:2.1.1\'\n    }\n}\n\nallprojects {\n    repositories {\n        google()\n        jcenter()\n    }\n}\n\nrootProject.buildDir = \'../build\'\nsubprojects {\n    project.buildDir = "${rootProject.buildDir}/${project.name}"\n}\nsubprojects {\n    project.evaluationDependsOn(\':app\')\n}\n\ntask clean(type: Delete) {\n    delete rootProject.buildDir\n}\n

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/app/build.gradle

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def localProperties = new Properties()\ndef localPropertiesFile = rootProject.file(\'local.properties\')\nif (localPropertiesFile.exists()) {\n    localPropertiesFile.withReader(\'UTF-8\') { reader ->\n        localProperties.load(reader)\n    }\n}\n\ndef flutterRoot = localProperties.getProperty(\'flutter.sdk\')\nif (flutterRoot == null) {\n    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")\n}\n\ndef flutterVersionCode = localProperties.getProperty(\'flutter.versionCode\')\nif (flutterVersionCode == null) {\n    flutterVersionCode = \'1\'\n}\n\ndef flutterVersionName = localProperties.getProperty(\'flutter.versionName\')\nif (flutterVersionName == null) {\n    flutterVersionName = \'1.0\'\n}\n\napply plugin: \'com.android.application\'\napply plugin: \'kotlin-android\'\napply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"\n// Application specific configuration (plugins)\napply plugin: \'com.google.gms.google-services\'\napply plugin: \'com.google.firebase.crashlytics\'\n\n\nandroid {\n    compileSdkVersion 28\n\n    sourceSets {\n        main.java.srcDirs += \'src/main/kotlin\'\n    }\n\n    lintOptions {\n        disable \'InvalidPackage\'\n    }\n\n    defaultConfig {\n        applicationId "com.example.firestore_network_bug"\n        minSdkVersion 16\n        targetSdkVersion 28\n        versionCode flutterVersionCode.toInteger()\n        versionName flutterVersionName\n        // Application specific configuration (multidex)\n        multiDexEnabled true\n\n    }\n\n    buildTypes {\n        release {\n            signingConfig signingConfigs.debug\n        }\n    }\n}\n\nflutter {\n    source \'../..\'\n}\n\ndependencies {\n    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"\n\n    // Application specific configuration (dependencies)\n    implementation \'com.android.support:multidex:1.0.3\'\n    implementation \'com.google.firebase:firebase-analytics:17.2.2\'\n    implementation \'com.google.firebase:firebase-crashlytics:17.0.0\'\n    implementation \'com.google.firebase:firebase-firestore:21.4.3\'\n}\n

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这是调试控制台输出：

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通过 Wifi - 发生错误时

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请注意，通过 Wifi，Crashlytics 也会失败。

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Launching lib/main.dart on Pixel 4 XL in debug mode...\n\xe2\x9c\x93 Built build/app/outputs/apk/debug/app-debug.apk.\nConnecting to VM Service at ws://127.0.0.1:54122/cahgKkWqnBU=/ws\nE/FirebaseCrashlytics(22411): Settings request failed.\nE/FirebaseCrashlytics(22411): java.io.InterruptedIOException: timeout\nE/FirebaseCrashlytics(22411):   at okhttp3.RealCall.timeoutExit(RealCall.java:107)\nE/FirebaseCrashlytics(22411):   at okhttp3.RealCall.execute(RealCall.java:96)\nE/FirebaseCrashlytics(22411):   at com.google.firebase.crashlytics.internal.network.HttpRequest.execute(com.google.firebase:firebase-crashlytics@@17.0.0:129)\nE/FirebaseCrashlytics(22411):   at com.google.firebase.crashlytics.internal.settings.network.DefaultSettingsSpiCall.invoke(com.google.firebase:firebase-crashlytics@@17.0.0:86)\nE/FirebaseCrashlytics(22411):   at com.google.firebase.crashlytics.internal.settings.SettingsController$1.then(com.google.firebase:firebase-crashlytics@@17.0.0:200)\nE/FirebaseCrashlytics(22411):   at com.google.firebase.crashlytics.internal.settings.SettingsController$1.then(com.google.firebase:firebase-crashlytics@@17.0.0:193)\nE/FirebaseCrashlytics(22411):   at com.google.android.gms.tasks.zzp.run(Unknown Source:2)\nE/FirebaseCrashlytics(22411):   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)\nE/FirebaseCrashlytics(22411):   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)\nE/FirebaseCrashlytics(22411):   at com.google.firebase.crashlytics.internal.common.ExecutorUtils$1$1.onRun(com.google.firebase:firebase-crashlytics@@17.0.0:60)\nE/FirebaseCrashlytics(22411):   at com.google.firebase.crashlytics.internal.common.BackgroundPriorityRunnable.run(com.google.firebase:firebase-crashlytics@@17.0.0:27)\nE/FirebaseCrashlytics(22411):   at java.lang.Thread.run(Thread.java:919)\nE/FirebaseCrashlytics(22411): Caused by: java.io.IOException: Canceled\nE/FirebaseCrashlytics(22411):   at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:120)\nE/FirebaseCrashlytics(22411):   at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)\nE/FirebaseCrashlytics(22411):   at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)\nE/FirebaseCrashlytics(22411):   at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:254)\nE/FirebaseCrashlytics(22411):   at okhttp3.RealCall.execute(RealCall.java:92)\nE/FirebaseCrashlytics(22411):   ... 10 more\nW/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.\nI/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0\nW/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.\nI/ore_network_bu(22411): The ClassLoaderContext is a special shared library.\nI/chatty  (22411): uid=10227(com.example.firestore_network_bug) AsyncTask #1 identical 1 line\nI/ore_network_bu(22411): The ClassLoaderContext is a special shared library.\nW/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)\nW/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->arrayBaseOffset(Ljava/lang/Class;)I (greylist,core-platform-api, linking, allowed)\nW/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->copyMemory(JJJ)V (greylist, linking, allowed)\nW/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->objectFieldOffset(Ljava/lang/reflect/Field;)J (greylist,core-platform-api, linking, allowed)\nW/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getByte(J)B (greylist,core-platform-api, linking, allowed)\nW/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getByte(Ljava/lang/Object;J)B (greylist,core-platform-api, linking, allowed)\nW/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getLong(J)J (greylist,core-platform-api, linking, allowed)\nW/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->putByte(JB)V (greylist,core-platform-api, linking, allowed)\nW/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->putByte(Ljava/lang/Object;JB)V (greylist,core-platform-api, linking, allowed)\nW/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, reflection, allowed)\nW/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, reflection, allowed)\nW/ore_network_bu(22411): Accessing hidden field Ljava/nio/Buffer;->address:J (greylist, reflection, allowed)\nV/NativeCrypto(22411): Registering com/google/android/gms/org/conscrypt/NativeCrypto\'s 286 native methods...\nW/ore_network_bu(22411): Accessing hidden method Ljava/security/spec/ECParameterSpec;->getCurveName()Ljava/lang/String; (greylist, reflection, allowed)\nI/ProviderInstaller(22411): Installed default security provider GmsCore_OpenSSL\nW/Firestore(22411): (21.4.3) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Backend didn\'t respond within 10 seconds\nW/Firestore(22411):\nW/Firestore(22411): This typically indicates that your device does not have a healthy Internet connection at the moment. The client will operate in offline mode until it is able to successfully connect to the backend.\nW/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.\nI/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0\nW/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.\nW/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.\nI/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0\nW/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.\nW/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.\nI/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0\nW/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.\nW/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.\nI/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0\nW/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.\nW/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.\nI/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0\nW/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.\nW/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.\nI/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0\nW/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.\n

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通过 LTE - 当一切正常时

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Launching lib/main.dart on Pixel 4 XL in debug mode...\n\xe2\x9c\x93 Built build/app/outputs/apk/debug/app-debug.apk.\nConnecting to VM Service at ws://127.0.0.1:54345/egB1v0JRe6c=/ws\nW/DynamiteModule(23529): Local module descriptor class for providerinstaller not found.\nI/DynamiteModule(23529): Considering local module providerinstaller:0 and remote module providerinstaller:0\nW/ProviderInstaller(23529): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.\nI/ore_network_bu(23529): The ClassLoaderContext is a special shared library.\nI/chatty  (23529): uid=10227(com.example.firestore_network_bug) AsyncTask #1 identical 1 line\nI/ore_network_bu(23529): The ClassLoaderContext is a special shared library.\nW/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)\nW/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->arrayBaseOffset(Ljava/lang/Class;)I (greylist,core-platform-api, linking, allowed)\nW/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->copyMemory(JJJ)V (greylist, linking, allowed)\nW/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->objectFieldOffset(Ljava/lang/reflect/Field;)J (greylist,core-platform-api, linking, allowed)\nW/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getByt

    

Answer 1

如果通过 wifi 连接的两个物理设备无法连接到 Firebase Cloud Firestore，但可以使用移动网络工作，则可能是 wifi 中的某些配置或 ISP 阻止了 Firebase。您可以通过终端 ping Firebase 端点来测试这一点，以验证您的请求是否得到响应。

Firestore REST API 端点以此 URL 开头。您可以尝试使用终端对其进行 ping 操作。

ping firestore.googleapis.com