onSnapshot hanging after killing iOS and restarting

[dsessoms]

Issue

Using onSnapshot works when first installing an iOS app with a release scheme, but once the app is killed and restarted a couple of times (1-2 on average), onSnapshot fails to return data or throw an error.

After extensive testing I found that setting includeMetadataChanges to true prevented this issue, but does lead to more events than desired.

useEffect(() => {
    if (!uid || uid === '') {
      log(`uid: ${uid}`);
      setBoordUser(undefined);
      return;
    }
    log(`uid: ${uid}`);
    const subscriber = firestore()
      .collection('users')
      .doc(uid)
      .onSnapshot(
        (snapshot) => {
          if (!snapshot || !snapshot.exists) {
            setBoordUser(undefined);
          } else {
            setBoordUser(snapshot.data() as IBoordUser);
          }
        },
        (error) => {
          log(JSON.stringify(error));
        },
      );
    return () => subscriber();
  }, [uid]);

---

Project Files

Javascript

Click To Expand

package.json:

{
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "android": "npx react-native run-android --verbose",
    "android-release": "npx react-native run-android --variant=release",
    "ios": "react-native run-ios",
    "start": "react-native start",
    "code-push": "ts-node ./bin/code-push.ts",
    "bundle-android": "cd android && ./gradlew bundleRelease",
    "start-android-release": "npx react-native run-android --variant=release",
    "test": "jest",
    "compile": "tsc --noEmit",
    "lint": "eslint . --ext .js,.jsx,.ts,.tsx",
    "dev-tools": "react-devtools",
    "postinstall": "npx jetify"
  },
  "dependencies": {
    "@expo/react-native-action-sheet": "^3.6.0",
    "@invertase/react-native-apple-authentication": "^0.2.0",
    "@react-native-community/cameraroll": "^1.5.2",
    "@react-native-community/google-signin": "^4.0.0",
    "@react-native-community/masked-view": "^0.1.7",
    "@react-native-firebase/analytics": "6.7.1",
    "@react-native-firebase/app": "6.7.1",
    "@react-native-firebase/auth": "6.7.1",
    "@react-native-firebase/database": "6.7.1",
    "@react-native-firebase/dynamic-links": "6.7.1",
    "@react-native-firebase/firestore": "6.7.1",
    "@react-native-firebase/messaging": "6.7.1",
    "@react-native-firebase/remote-config": "6.7.1",
    "@react-native-firebase/storage": "6.7.1",
    "@react-navigation/bottom-tabs": "^5.2.7",
    "@react-navigation/native": "^5.1.4",
    "@react-navigation/stack": "^5.2.9",
    "@sentry/react-native": "^1.3.7",
    "@terrylinla/react-native-sketch-canvas": "^0.8.0",
    "@types/inquirer": "^6.5.0",
    "@types/lodash": "^4.14.149",
    "@types/react-native-vector-icons": "^6.4.5",
    "@types/uuid": "^7.0.3",
    "expo-keep-awake": "^8.1.0",
    "expo-linear-gradient": "^8.1.0",
    "gs": "^0.0.2",
    "inquirer": "^7.1.0",
    "lodash": "^4.17.15",
    "react": "16.11.0",
    "react-native": "0.62.0",
    "react-native-agora": "^2.9.1-alpha.3",
    "react-native-animatable": "^1.3.3",
    "react-native-camera": "^3.22.0",
    "react-native-code-push": "^6.2.0",
    "react-native-confetti": "^0.1.0",
    "react-native-draggable": "^3.1.0",
    "react-native-draggable-flatlist": "^2.3.2",
    "react-native-fs": "^2.16.6",
    "react-native-gesture-handler": "^1.6.1",
    "react-native-home-pressed": "^1.1.4",
    "react-native-paper": "^3.6.0",
    "react-native-reanimated": "^1.7.1",
    "react-native-render-html": "^4.2.0",
    "react-native-safe-area-context": "^0.7.3",
    "react-native-screens": "^2.4.0",
    "react-native-sound": "^0.11.0",
    "react-native-unimodules": "^0.9.0",
    "react-native-vector-icons": "^6.6.0",
    "react-native-webview": "^9.1.3",
    "reanimated-bottom-sheet": "^1.0.0-alpha.19",
    "uuid": "^3.4.0"
  },
  "devDependencies": {
    "@babel/core": "^7.6.2",
    "@babel/runtime": "^7.6.2",
    "@react-native-community/eslint-config": "^1.0.0",
    "@types/jest": "^24.0.24",
    "@types/react-native": "^0.62.0",
    "@types/react-test-renderer": "16.9.2",
    "@typescript-eslint/eslint-plugin": "^2.25.0",
    "@typescript-eslint/parser": "^2.25.0",
    "babel-jest": "^24.9.0",
    "eslint": "^6.5.1",
    "jest": "^24.9.0",
    "metro-react-native-babel-preset": "^0.58.0",
    "prettier": "^2.0.2",
    "react-devtools": "^4",
    "react-test-renderer": "16.11.0",
    "ts-node": "^8.8.2",
    "typescript": "^3.7.3"
  },
  "jest": {
    "preset": "react-native",
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "jsx",
      "json",
      "node"
    ]
  }
}

iOS

Click To Expand

ios/Podfile:

• I'm not using Pods
• I'm using Pods and my Podfile looks like:

platform :ios, '10.0'
require_relative '../node_modules/@react-native-community/cli-platform-ios/native_modules'
require_relative '../node_modules/react-native-unimodules/cocoapods.rb'

def add_flipper_pods!
  version = '~> 0.33.1'
  pod 'FlipperKit', version, :configuration => 'Debug'
  pod 'FlipperKit/FlipperKitLayoutPlugin', version, :configuration => 'Debug'
  pod 'FlipperKit/SKIOSNetworkPlugin', version, :configuration => 'Debug'
  pod 'FlipperKit/FlipperKitUserDefaultsPlugin', version, :configuration => 'Debug'
  pod 'FlipperKit/FlipperKitReactPlugin', version, :configuration => 'Debug'
end

# Post Install processing for Flipper
def flipper_post_install(installer)
  installer.pods_project.targets.each do |target|
    if target.name == 'YogaKit'
      target.build_configurations.each do |config|
        config.build_settings['SWIFT_VERSION'] = '4.1'
      end
    end
  end
end

target 'App' do
  # Pods for App
  pod 'GoogleSignIn', '~> 5.0.2'
  pod 'FBLazyVector', :path => "../node_modules/react-native/Libraries/FBLazyVector"
  pod 'FBReactNativeSpec', :path => "../node_modules/react-native/Libraries/FBReactNativeSpec"
  pod 'RCTRequired', :path => "../node_modules/react-native/Libraries/RCTRequired"
  pod 'RCTTypeSafety', :path => "../node_modules/react-native/Libraries/TypeSafety"
  pod 'React', :path => '../node_modules/react-native/'
  pod 'React-Core', :path => '../node_modules/react-native/'
  pod 'React-CoreModules', :path => '../node_modules/react-native/React/CoreModules'
  pod 'React-Core/DevSupport', :path => '../node_modules/react-native/'
  pod 'React-RCTActionSheet', :path => '../node_modules/react-native/Libraries/ActionSheetIOS'
  pod 'React-RCTAnimation', :path => '../node_modules/react-native/Libraries/NativeAnimation'
  pod 'React-RCTBlob', :path => '../node_modules/react-native/Libraries/Blob'
  pod 'React-RCTImage', :path => '../node_modules/react-native/Libraries/Image'
  pod 'React-RCTLinking', :path => '../node_modules/react-native/Libraries/LinkingIOS'
  pod 'React-RCTNetwork', :path => '../node_modules/react-native/Libraries/Network'
  pod 'React-RCTSettings', :path => '../node_modules/react-native/Libraries/Settings'
  pod 'React-RCTText', :path => '../node_modules/react-native/Libraries/Text'
  pod 'React-RCTVibration', :path => '../node_modules/react-native/Libraries/Vibration'
  pod 'React-Core/RCTWebSocket', :path => '../node_modules/react-native/'

  pod 'React-cxxreact', :path => '../node_modules/react-native/ReactCommon/cxxreact'
  pod 'React-jsi', :path => '../node_modules/react-native/ReactCommon/jsi'
  pod 'React-jsiexecutor', :path => '../node_modules/react-native/ReactCommon/jsiexecutor'
  pod 'React-jsinspector', :path => '../node_modules/react-native/ReactCommon/jsinspector'
  pod 'ReactCommon/callinvoker', :path => "../node_modules/react-native/ReactCommon"
  pod 'ReactCommon/turbomodule/core', :path => "../node_modules/react-native/ReactCommon"
  pod 'Yoga', :path => '../node_modules/react-native/ReactCommon/yoga', :modular_headers => true

  pod 'DoubleConversion', :podspec => '../node_modules/react-native/third-party-podspecs/DoubleConversion.podspec'
  pod 'glog', :podspec => '../node_modules/react-native/third-party-podspecs/glog.podspec'
  pod 'Folly', :podspec => '../node_modules/react-native/third-party-podspecs/Folly.podspec'

  pod 'react-native-agora', :path => '../node_modules/react-native-agora'

  pod 'RNVectorIcons', :path => '../node_modules/react-native-vector-icons'

  pod 'RNFS', :path => '../node_modules/react-native-fs'

  pod 'react-native-cameraroll', :path => '../node_modules/@react-native-community/cameraroll'

  target 'AppTests' do
    inherit! :complete
    # Pods for testing
  end

  use_native_modules!
  use_unimodules!

  # Enables Flipper.
  #
  # Note that if you have use_frameworks! enabled, Flipper will not work and
  # you should disable these next few lines.
  add_flipper_pods!
  post_install do |installer|
    flipper_post_install(installer)
  end
end

target 'App-tvOS' do
  # Pods for App-tvOS

  target 'App-tvOSTests' do
    inherit! :search_paths
    # Pods for testing
  end
end

AppDelegate.m:

#import "AppDelegate.h"

#import <React/RCTBridge.h>
#import <React/RCTBundleURLProvider.h>
#import <React/RCTRootView.h>
#import <Firebase.h>

#import <CodePush/CodePush.h>

#import <UMCore/UMModuleRegistry.h>
#import <UMReactNativeAdapter/UMNativeModulesProxy.h>
#import <UMReactNativeAdapter/UMModuleRegistryAdapter.h>

#if DEBUG
#import <FlipperKit/FlipperClient.h>
#import <FlipperKitLayoutPlugin/FlipperKitLayoutPlugin.h>
#import <FlipperKitUserDefaultsPlugin/FKUserDefaultsPlugin.h>
#import <FlipperKitNetworkPlugin/FlipperKitNetworkPlugin.h>
#import <SKIOSNetworkPlugin/SKIOSNetworkAdapter.h>
#import <FlipperKitReactPlugin/FlipperKitReactPlugin.h>

static void InitializeFlipper(UIApplication *application) {
  FlipperClient *client = [FlipperClient sharedClient];
  SKDescriptorMapper *layoutDescriptorMapper = [[SKDescriptorMapper alloc] initWithDefaults];
  [client addPlugin:[[FlipperKitLayoutPlugin alloc] initWithRootNode:application withDescriptorMapper:layoutDescriptorMapper]];
  [client addPlugin:[[FKUserDefaultsPlugin alloc] initWithSuiteName:nil]];
  [client addPlugin:[FlipperKitReactPlugin new]];
  [client addPlugin:[[FlipperKitNetworkPlugin alloc] initWithNetworkAdapter:[SKIOSNetworkAdapter new]]];
  [client start];
}
#endif

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
#if DEBUG
  InitializeFlipper(application);
#endif
  if ([FIRApp defaultApp] == nil) {
    [FIRApp configure];
  }

  self.moduleRegistryAdapter = [[UMModuleRegistryAdapter alloc] initWithModuleRegistryProvider:[[UMModuleRegistryProvider alloc] init]];
  RCTBridge *bridge = [[RCTBridge alloc] initWithDelegate:self launchOptions:launchOptions];
  RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge
                                                   moduleName:@"App"
                                            initialProperties:nil];

  rootView.backgroundColor = [[UIColor alloc] initWithRed:1.0f green:1.0f blue:1.0f alpha:1];

  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
  UIViewController *rootViewController = [UIViewController new];
  rootViewController.view = rootView;
  self.window.rootViewController = rootViewController;
  [self.window makeKeyAndVisible];
  return YES;
}

- (NSArray<id<RCTBridgeModule>> *)extraModulesForBridge:(RCTBridge *)bridge
{
  NSArray<id<RCTBridgeModule>> *extraModules = [_moduleRegistryAdapter extraModulesForBridge:bridge];
  // You can inject any extra modules that you would like here, more information at:
  // https://facebook.github.io/react-native/docs/native-modules-ios.html#dependency-injection
  return extraModules;
}

- (NSURL *)sourceURLForBridge:(RCTBridge *)bridge
{
#if DEBUG
  return [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index" fallbackResource:nil];
#else
  return [CodePush bundleURL];
#endif
}

@end

---

Environment

Click To Expand

react-native info output:

 System:
    OS: macOS 10.15.4
    CPU: (8) x64 Intel(R) Core(TM) i5-8279U CPU @ 2.40GHz
    Memory: 39.79 MB / 16.00 GB
    Shell: 3.2.57 - /bin/bash
  Binaries:
    Node: 12.13.1 - ~/.nvm/versions/node/v12.13.1/bin/node
    Yarn: 1.21.1 - /usr/local/bin/yarn
    npm: 6.12.1 - ~/.nvm/versions/node/v12.13.1/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  SDKs:
    iOS SDK:
      Platforms: iOS 13.4, DriverKit 19.0, macOS 10.15, tvOS 13.4, watchOS 6.2
    Android SDK:
      API Levels: 23, 24, 25, 26, 27, 28
      Build Tools: 23.0.1, 25.0.2, 26.0.2, 26.0.3, 27.0.3, 28.0.3
      System Images: android-27 | Intel x86 Atom_64, android-27 | Google APIs Intel x86 Atom, android-27 | Google Play Intel x86 Atom, android-28 | Google APIs Intel x86 Atom
  IDEs:
    Android Studio: 3.5 AI-191.8026.42.35.5791312
    Xcode: 11.4.1/11E503a - /usr/bin/xcodebuild
  npmPackages:
    react: 16.11.0 => 16.11.0 
    react-native: 0.62.0 => 0.62.0

• Platform that you're experiencing the issue on:
  • iOS
  • Android
  • iOS but have not tested behavior on Android
  • Android but have not tested behavior on iOS
  • Both
• react-native-firebase version you're using that has this issue:
  • e.g. 6.7.1
• Firebase module(s) you're using that has the issue:
  • Firestore
• Are you using TypeScript?
  • Y & 3.7.3

---

• 👉 Check out React Native Firebase and Invertase on Twitter for updates on the library.

[sbmohan1]

I'm experiencing a similar thing. When I restart the app on iOS, it hangs and doesn't return an error or anything. But when I reload the app after that initial launch, it starts working normally.

[stale]

Hello 👋, to help manage issues we automatically close stale issues.
This issue has been automatically marked as stale because it has not had activity for quite some time. Has this issue been fixed, or does it still require the community's attention?

This issue will be closed in 15 days if no further activity occurs.
Thank you for your contributions.

[zomars]

I think this is happening to me also

[mikehardy]

This is probably going to be an upstream issue in the underlying SDK - have you searched there @zomars to see if they have anything relevant? https://github.com/firebase/firebase-ios-sdk

[zomars]

@mikehardy I didn't found anything there, but it may be related to this: https://firebase.google.com/support/release-notes/ios#cloud-firestore

Cloud Firestore

Fixed an issue that may have prevented the client from connecting to the backend immediately after a user signed in.

I'll try to manually upgrade the SDK and report back.

[mikehardy]

Sounds like a plan - for reference we are using 6.27 in the test suite now and I'm using it locally without issue, so it should be safe though of course test things to make sure. I actually haven't ever suffered a regression in the entire 6.x series so I update pretty confidently whenever it comes out but now that I've said that the next one might bite me. Cheers

[zomars]

I've followed these steps:

• Added $FirebaseSDKVersion = '6.27.0' to my Podfile
• Ran pod update
• Ran react-native run-ios

And can confirm that the onSnapshot callback is running properly now.

[mikehardy]

fantastic news, thanks for testing and reporting success for future people