firebase - Firebase Firestore 在物理设备上通过 wifi 故障转移并出现错误：无法访问 Cloud Firestore 后端
问题描述
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：
W/Firestore( 4903): (21.4.3) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Backend didn't respond within 10 seconds
W/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.
重现
通常，在物理设备中运行时会发生错误。我创建了一个小应用程序，以便能够以最小的其余代码干扰来重现错误。请参阅下面的代码。
当您在调试器上点击运行（我正在使用 VSCode）然后我单击 (+) 按钮向 Firestore 发出请求时，它会尝试几秒钟（您会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：
PlatformException(Error performing get, Failed to get document because the client is offline., null)
然后，如果你关闭 wifi，请求就会完美运行。从 Firestore 检索到的文档内容显示在屏幕中：
现在，如果您再次打开 wifi，则请求有效。有时数据是从服务器中检索的，而其他数据是从缓存中检索的。
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Firestore Network Bug',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
bool _loading = false;
Map<String, dynamic> _firebaseDocument;
String _firebaseError;
String _source;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Firestore Network Bug"),
),
body: Padding(
padding: const EdgeInsets.all(24),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Text('Tap the (+) button to try to read from Firestore...',
style: TextStyle(fontSize: 20)),
_showProgress(),
_showResults(),
_showErrors(),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _readFromFirebase,
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
Widget _showProgress() {
return Padding(
padding: const EdgeInsets.only(top: 12.0),
child: Container(
height: 6.0,
child: (_loading) ? LinearProgressIndicator() : Container(),
),
);
}
Widget _showResults() {
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
SizedBox(height: 12.0),
Text("Result:"),
Container(
height: 150,
padding: const EdgeInsets.all(16),
color: Colors.blue[100],
child: (_firebaseDocument != null)
? Text("From $_source: \n\n" + _firebaseDocument?.toString(),
style: TextStyle(fontSize: 16))
: Container(),
),
],
);
}
Widget _showErrors() {
return Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
SizedBox(height: 12.0),
Text("Errors:"),
Container(
height: 150,
padding: const EdgeInsets.all(16),
color: Colors.red[100],
child: (_firebaseError != null)
? Text(_firebaseError?.toString(), style: TextStyle(fontSize: 16))
: Container(),
),
],
);
}
void _readFromFirebase() async {
setState(() {
_loading = true;
_firebaseDocument = null;
_firebaseError = null;
});
DocumentReference docRef =
Firestore.instance.document("myCollection/myDocument");
DocumentSnapshot snapshot = await docRef.get().catchError(
(onError) {
setState(() {
_loading = false;
_firebaseDocument = null;
_firebaseError = onError.toString();
});
},
);
if (_firebaseError != null) return;
_source = (snapshot.metadata.isFromCache) ? "cache" : "server";
if (snapshot.exists) {
setState(() {
_loading = false;
_firebaseDocument = snapshot.data;
});
print("Document found!");
print("- ${_firebaseDocument.toString()}");
} else {
print("Document not found!");
}
}
}
预期行为 由于设备通过 wifi 具有完美的连接，除了请求工作正常并且从服务器检索到文档之外。
附加上下文 在模拟器上，一切正常。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。
我用来测试的物理设备（两者都失败了），其中：Pixel 4XL（Android 10 QQ3Q.200605.001）和 Pixel 3XL（Android 10 QQ2A.200305.002）。
扑医生
[✓] Flutter (Channel stable, v1.17.3, on Mac OS X 10.15.4 19E287, locale en-US)
• Flutter version 1.17.3 at /Users/mlemos/Documents/flutter
• Framework revision b041144f83 (8 days ago), 2020-06-04 09:26:11 -0700
• Engine revision ee76268252
• Dart version 2.8.4
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
• Android SDK at /Users/mlemos/Library/Android/sdk
• Platform android-30, build-tools 29.0.2
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 11.5)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 11.5, Build version 11E608c
• CocoaPods version 1.9.1
[!] Android Studio (version 4.0)
• Android Studio at /Applications/Android Studio.app/Contents
✗ Flutter plugin not installed; this adds Flutter specific functionality.
✗ Dart plugin not installed; this adds Dart specific functionality.
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
[✓] VS Code (version 1.46.0)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.11.0
[✓] Connected device (2 available)
• Pixel 4 XL • 99201FFBA000KF • android-arm64 • Android 10 (API 29)
• Android SDK built for x86 • emulator-5554 • android-x86 • Android 7.1.1 (API 25) (emulator)
! Doctor found issues in 1 category.
发布规范.yaml
name: firestore_network_bug
description: A new Flutter project.
publish_to: 'none'
version: 1.0.0+1
environment:
sdk: ">=2.7.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
cupertino_icons: ^0.1.3
firebase_analytics: ^5.0.14
cloud_firestore: ^0.13.6
dev_dependencies:
flutter_test:
sdk: flutter
flutter:
uses-material-design: true
/build.gradle
buildscript {
ext.kotlin_version = '1.3.50'
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.5.0'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
// Application specific configuration (dependencies)
classpath 'com.google.gms:google-services:4.3.3'
classpath 'com.google.firebase:firebase-crashlytics-gradle:2.1.1'
}
}
allprojects {
repositories {
google()
jcenter()
}
}
rootProject.buildDir = '../build'
subprojects {
project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
project.evaluationDependsOn(':app')
}
task clean(type: Delete) {
delete rootProject.buildDir
}
/app/build.gradle
def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
localPropertiesFile.withReader('UTF-8') { reader ->
localProperties.load(reader)
}
}
def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}
def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
flutterVersionCode = '1'
}
def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
flutterVersionName = '1.0'
}
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
// Application specific configuration (plugins)
apply plugin: 'com.google.gms.google-services'
apply plugin: 'com.google.firebase.crashlytics'
android {
compileSdkVersion 28
sourceSets {
main.java.srcDirs += 'src/main/kotlin'
}
lintOptions {
disable 'InvalidPackage'
}
defaultConfig {
applicationId "com.example.firestore_network_bug"
minSdkVersion 16
targetSdkVersion 28
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
// Application specific configuration (multidex)
multiDexEnabled true
}
buildTypes {
release {
signingConfig signingConfigs.debug
}
}
}
flutter {
source '../..'
}
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
// Application specific configuration (dependencies)
implementation 'com.android.support:multidex:1.0.3'
implementation 'com.google.firebase:firebase-analytics:17.2.2'
implementation 'com.google.firebase:firebase-crashlytics:17.0.0'
implementation 'com.google.firebase:firebase-firestore:21.4.3'
}
这是调试控制台输出：
通过 Wifi - 发生错误时
请注意，通过 Wifi，Crashlytics 也会失败。
Launching lib/main.dart on Pixel 4 XL in debug mode...
✓ Built build/app/outputs/apk/debug/app-debug.apk.
Connecting to VM Service at ws://127.0.0.1:54122/cahgKkWqnBU=/ws
E/FirebaseCrashlytics(22411): Settings request failed.
E/FirebaseCrashlytics(22411): java.io.InterruptedIOException: timeout
E/FirebaseCrashlytics(22411): at okhttp3.RealCall.timeoutExit(RealCall.java:107)
E/FirebaseCrashlytics(22411): at okhttp3.RealCall.execute(RealCall.java:96)
E/FirebaseCrashlytics(22411): at com.google.firebase.crashlytics.internal.network.HttpRequest.execute(com.google.firebase:firebase-crashlytics@@17.0.0:129)
E/FirebaseCrashlytics(22411): at com.google.firebase.crashlytics.internal.settings.network.DefaultSettingsSpiCall.invoke(com.google.firebase:firebase-crashlytics@@17.0.0:86)
E/FirebaseCrashlytics(22411): at com.google.firebase.crashlytics.internal.settings.SettingsController$1.then(com.google.firebase:firebase-crashlytics@@17.0.0:200)
E/FirebaseCrashlytics(22411): at com.google.firebase.crashlytics.internal.settings.SettingsController$1.then(com.google.firebase:firebase-crashlytics@@17.0.0:193)
E/FirebaseCrashlytics(22411): at com.google.android.gms.tasks.zzp.run(Unknown Source:2)
E/FirebaseCrashlytics(22411): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
E/FirebaseCrashlytics(22411): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
E/FirebaseCrashlytics(22411): at com.google.firebase.crashlytics.internal.common.ExecutorUtils$1$1.onRun(com.google.firebase:firebase-crashlytics@@17.0.0:60)
E/FirebaseCrashlytics(22411): at com.google.firebase.crashlytics.internal.common.BackgroundPriorityRunnable.run(com.google.firebase:firebase-crashlytics@@17.0.0:27)
E/FirebaseCrashlytics(22411): at java.lang.Thread.run(Thread.java:919)
E/FirebaseCrashlytics(22411): Caused by: java.io.IOException: Canceled
E/FirebaseCrashlytics(22411): at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:120)
E/FirebaseCrashlytics(22411): at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
E/FirebaseCrashlytics(22411): at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
E/FirebaseCrashlytics(22411): at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:254)
E/FirebaseCrashlytics(22411): at okhttp3.RealCall.execute(RealCall.java:92)
E/FirebaseCrashlytics(22411): ... 10 more
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
I/ore_network_bu(22411): The ClassLoaderContext is a special shared library.
I/chatty (22411): uid=10227(com.example.firestore_network_bug) AsyncTask #1 identical 1 line
I/ore_network_bu(22411): The ClassLoaderContext is a special shared library.
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->arrayBaseOffset(Ljava/lang/Class;)I (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->copyMemory(JJJ)V (greylist, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->objectFieldOffset(Ljava/lang/reflect/Field;)J (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getByte(J)B (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getByte(Ljava/lang/Object;J)B (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getLong(J)J (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->putByte(JB)V (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->putByte(Ljava/lang/Object;JB)V (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, reflection, allowed)
W/ore_network_bu(22411): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, reflection, allowed)
W/ore_network_bu(22411): Accessing hidden field Ljava/nio/Buffer;->address:J (greylist, reflection, allowed)
V/NativeCrypto(22411): Registering com/google/android/gms/org/conscrypt/NativeCrypto's 286 native methods...
W/ore_network_bu(22411): Accessing hidden method Ljava/security/spec/ECParameterSpec;->getCurveName()Ljava/lang/String; (greylist, reflection, allowed)
I/ProviderInstaller(22411): Installed default security provider GmsCore_OpenSSL
W/Firestore(22411): (21.4.3) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Backend didn't respond within 10 seconds
W/Firestore(22411):
W/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.
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
W/DynamiteModule(22411): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(22411): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(22411): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
通过 LTE - 当一切正常时
Launching lib/main.dart on Pixel 4 XL in debug mode...
✓ Built build/app/outputs/apk/debug/app-debug.apk.
Connecting to VM Service at ws://127.0.0.1:54345/egB1v0JRe6c=/ws
W/DynamiteModule(23529): Local module descriptor class for providerinstaller not found.
I/DynamiteModule(23529): Considering local module providerinstaller:0 and remote module providerinstaller:0
W/ProviderInstaller(23529): Failed to load providerinstaller module: No acceptable module found. Local version is 0 and remote version is 0.
I/ore_network_bu(23529): The ClassLoaderContext is a special shared library.
I/chatty (23529): uid=10227(com.example.firestore_network_bug) AsyncTask #1 identical 1 line
I/ore_network_bu(23529): The ClassLoaderContext is a special shared library.
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->arrayBaseOffset(Ljava/lang/Class;)I (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->copyMemory(JJJ)V (greylist, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->objectFieldOffset(Ljava/lang/reflect/Field;)J (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getByte(J)B (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getByte(Ljava/lang/Object;J)B (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getLong(J)J (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->putByte(JB)V (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->putByte(Ljava/lang/Object;JB)V (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, reflection, allowed)
W/ore_network_bu(23529): Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, reflection, allowed)
W/ore_network_bu(23529): Accessing hidden field Ljava/nio/Buffer;->address:J (greylist, reflection, allowed)
V/NativeCrypto(23529): Registering com/google/android/gms/org/conscrypt/NativeCrypto's 286 native methods...
W/ore_network_bu(23529): Accessing hidden method Ljava/security/spec/ECParameterSpec;->getCurveName()Ljava/lang/String; (greylist, reflection, allowed)
I/ProviderInstaller(23529): Installed default security provider GmsCore_OpenSSL
W/ore_network_bu(23529): Accessing hidden field Ljava/net/Socket;->impl:Ljava/net/SocketImpl; (greylist, reflection, allowed)
W/ore_network_bu(23529): Accessing hidden field Ljava/io/FileDescriptor;->descriptor:I (greylist, JNI, allowed)
W/ore_network_bu(23529): Accessing hidden method Ljava/security/spec/ECParameterSpec;->setCurveName(Ljava/lang/String;)V (greylist, reflection, allowed)
W/ore_network_bu(23529): Accessing hidden method Ldalvik/system/BlockGuard;->getThreadPolicy()Ldalvik/system/BlockGuard$Policy; (greylist,core-platform-api, linking, allowed)
W/ore_network_bu(23529): Accessing hidden method Ldalvik/system/BlockGuard$Policy;->onNetwork()V (greylist, linking, allowed)
I/flutter (23529): Document found!
I/flutter (23529): - {date: Timestamp(seconds=1590980400, nanoseconds=0), published: true, title: Hello World!, body: Firebase rocks and Firestore rocks also (when it works).}
解决方案
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