客户端离线，获取文档失败

Question

我正在将 Flutter 用于移动应用程序，并且最近注意到一个间歇性错误，导致从 Cloud Firestore 读取文档失败。我终于得到了我的一台设备来获取错误，因此我将其插入以获取日志，当我尝试访问其中一个文档时出现此错误。

flutter : [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] 未处理的异常：PlatformException（执行获取时出错，由于客户端离线，无法获取文档。，空）

这个错误是从我的这行代码中抛出的，它在 99.9% 的时间内适用于 99.9% 的用户

DocumentSnapshot userLivestream = await Firestore.instance.collection('livestreams').document(userId).get();

我已经阅读了很多关于该主题的内容，并得到了很多不同的答案。一个堆栈溢出帖子说它是在 2.5 年前修复的（显然不是，参考：Firebase Cloud Firestore 抛出“客户端离线”），其他人说它是特定于 android 的（参考：https : //github.com/EddyVerbruggen/nativescript -plugin-firebase/issues/631），但我在 android 和 iOS 上都遇到了同样的问题。这个问题最近变得更糟了，所以可能是我使用的包的问题。这里的相关包是从我的 pubspec.yaml 粘贴过来的。

  firebase_core: ^0.4.0+1
  cloud_firestore: ^0.11.0+1
  firebase_auth: ^0.11.1

有时错误会在一段时间后自行修复，它可能与登录应用程序或更改设备连接的网络有关，但有了这些信息，我仍然无法始终如一地复制问题。有没有人遇到过类似的问题，你是如何解决的？

堆栈跟踪：

03-31 13:20:09.488 19623  6084 E flutter : [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: PlatformException(Error performing get, Failed to get document because the client is offline., null)
03-31 13:20:09.488 19623  6084 E flutter : #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:569)
03-31 13:20:09.488 19623  6084 E flutter : #1      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:321)
03-31 13:20:09.488 19623  6084 E flutter : <asynchronous suspension>
03-31 13:20:09.488 19623  6084 E flutter : #2      MethodChannel.invokeMapMethod (package:flutter/src/services/platform_channel.dart:349)
03-31 13:20:09.488 19623  6084 E flutter : #3      DocumentReference.get (package:cloud_firestore/src/document_reference.dart:76)
03-31 13:20:09.488 19623  6084 E flutter : #4      LivestreamRepository.getUsersLivestream (package:hallo/repositories/livestream_repository.dart:81)
03-31 13:20:09.488 19623  6084 E flutter : #5      joinLivestream (package:hallo/presentation/widgets/livestream_previews.dart:448)
03-31 13:20:09.488 19623  6084 E flutter : #6      _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:45)
03-31 13:20:09.488 19623  6084 E flutter : #7      joinLivestream (package:hallo/presentation/widgets/livestream_previews.dart:447)
03-31 13:20:09.488 19623  6084 E flutter : #8      LiveStreamMenuState._buildLivestreamList.<anonymous closure>.<anonymous closure> (package:hallo/livestream/livestream_screen.dart:463)
03-31 13:20:09.488 19623  6084 E flutter : #9      _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:45)
03-31 13:20:09.488 19623  6084 E flutter : #10     LiveStreamMenuState._buildLivestreamList.<anonymous closure>.<anonymous closure> (package:hallo/livestream/livestream_screen.dart:460)
03-31 13:20:09.488 19623  6084 E flutter : #11     GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182)
03-31 13:20:09.488 19623  6084 E flutter : #12     TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:486)
03-31 13:20:09.488 19623  6084 E flutter : #13     BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:282)
03-31 13:20:09.488 19623  6084 E flutter : #14     BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:236)
03-31 13:20:09.488 19623  6084 E flutter : #15     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156)
03-31 13:20:09.488 19623  6084 E flutter : #16     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:222)
03-31 13:20:09.488 19623  6084 E flutter : #17     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:198)
03-31 13:20:09.488 19623  6084 E flutter : #18     GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156)
03-31 13:20:09.488 19623  6084 E flutter : #19     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102)
03-31 13:20:09.488 19623  6084 E flutter : #20     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86)
03-31 13:20:09.488 19623  6084 E flutter : #21     _rootRunUnary (dart:async/zone.dart:1138)
03-31 13:20:09.488 19623  6084 E flutter : #22     _CustomZone.runUnary (dart:async/zone.dart:1031)
03-31 13:20:09.488 19623  6084 E flutter : #23     _CustomZone.runUnaryGuarded (dart:async/zone.dart:933)
03-31 13:20:09.488 19623  6084 E flutter : #24     _invoke1 (dart:ui/hooks.dart:273)
03-31 13:20:09.488 19623  6084 E flutter : #25     _dispatchPointerDataPacket (dart:ui/hooks.dart:182)

Answer 1

我遇到了同样的问题。我尝试引用尚未创建的集合。所以，我刚刚用虚拟文档创建了一个集合。现在效果很好。

cloud_firestore 开发人员应该关注错误报告。