在Firebase可观察列表查询中捕获抓取错误

时间：2019-04-12 04:16:33

标签： firebase observable angularfire2

我在实时firedb节点上设置了安全性，以便某些用户无法读取它。使用可观察的实时读取列表，这对于允许的用户来说效果很好。但是，对于不允许的用户，它会抛出拒绝权限错误，我可以在chrome控制台中看到该错误。我想捕获此错误并标记给用户。

private cardList: AngularFireList<Card>

fetchCards(){
    this.cardList = this.db.list<Card>('adminCardQueue', ref => ref.orderByChild('_date').limitToLast(50))

    return this.cardList.snapshotChanges().pipe(
       map(changes => 
        changes.map(c => ({ key: c.payload.key, ...c.payload.val()}))
       )
      );
}

面向.ts 

refreshCards(){
    this.cards = this.dataSvc.fetchCards().pipe(
      map((cards: any) => cards.map(cardObj => new Card(cardObj.key, cardObj._frontImageUrl, cardObj._backImageUrl, cardObj._status, cardObj._date, cardObj._userId, cardObj._message)))
    );
  }

来自权限被拒绝的错误

ERROR Error: permission_denied at /adminCardQueue: Client doesn't have permission to access the desired data.
    at errorForServerCode (index.cjs.js:651)
    at onComplete (index.cjs.js:9152)
    at Object.onComplete (index.cjs.js:12740)
    at index.cjs.js:11852
    at PersistentConnection.push../node_modules/@firebase/database/dist/index.cjs.js.PersistentConnection.onDataMessage_ (index.cjs.js:12107)
    at Connection.push../node_modules/@firebase/database/dist/index.cjs.js.Connection.onDataMessage_ (index.cjs.js:11390)
    at Connection.push../node_modules/@firebase/database/dist/index.cjs.js.Connection.onPrimaryMessageReceived_ (index.cjs.js:11384)
    at WebSocketConnection.onMessage (index.cjs.js:11285)
    at WebSocketConnection.push../node_modules/@firebase/database/dist/index.cjs.js.WebSocketConnection.appendFrame_ (index.cjs.js:10888)
    at WebSocketConnection.push../node_modules/@firebase/database/dist/index.cjs.js.WebSocketConnection.handleIncomingFrame (index.cjs.js:10938)
defaultErrorLogger @ core.js:14597
push../node_modules/@angular/core/fesm5/core.js.ErrorHandler.handleError @ core.js:14645
next @ core.js:16628
schedulerFn @ core.js:12609
push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.__tryOrUnsub @ Subscriber.js:196
push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.next @ Subscriber.js:134
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._next @ Subscriber.js:77
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next @ Subscriber.js:54
push../node_modules/rxjs/_esm5/internal/Subject.js.Subject.next @ Subject.js:47
push../node_modules/@angular/core/fesm5/core.js.EventEmitter.emit @ core.js:12593
(anonymous) @ core.js:16178
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:391
push../node_modules/zone.js/dist/zone.js.Zone.run @ zone.js:150
push../node_modules/@angular/core/fesm5/core.js.NgZone.runOutsideAngular @ core.js:16115
onHandleError @ core.js:16178
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.handleError @ zone.js:395
push../node_modules/zone.js/dist/zone.js.Zone.runTask @ zone.js:198
push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask @ zone.js:498
ZoneTask.invoke @ zone.js:487
timer @ zone.js:2281
setTimeout (async)
scheduleTask @ zone.js:2302
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask @ zone.js:410
onScheduleTask @ zone.js:301
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask @ zone.js:404
push../node_modules/zone.js/dist/zone.js.Zone.scheduleTask @ zone.js:238
push../node_modules/zone.js/dist/zone.js.Zone.scheduleMacroTask @ zone.js:261
scheduleMacroTaskWithCurrentZone @ zone.js:1245
(anonymous) @ zone.js:2317
proto.(anonymous function) @ zone.js:1569
hostReportError @ hostReportError.js:3
push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.__tryOrUnsub @ Subscriber.js:204
push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.error @ Subscriber.js:147
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error @ Subscriber.js:80
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error @ Subscriber.js:60
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error @ Subscriber.js:80
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error @ Subscriber.js:60
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error @ Subscriber.js:80
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error @ Subscriber.js:60
(anonymous) @ angularfire2.js:49
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:391
onInvoke @ core.js:16156
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:390
push../node_modules/zone.js/dist/zone.js.Zone.run @ zone.js:150
push../node_modules/@angular/core/fesm5/core.js.NgZone.run @ core.js:16070
(anonymous) @ angularfire2.js:49
push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.__tryOrUnsub @ Subscriber.js:196
push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.error @ Subscriber.js:147
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error @ Subscriber.js:80
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error @ Subscriber.js:60
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error @ Subscriber.js:80
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error @ Subscriber.js:60
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error @ Subscriber.js:80
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error @ Subscriber.js:60
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error @ Subscriber.js:80
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error @ Subscriber.js:60
push../node_modules/rxjs/_esm5/internal/Subject.js.Subject.error @ Subject.js:62
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error @ Subscriber.js:80
push../node_modules/rxjs/_esm5/internal/observable/ConnectableObservable.js.ConnectableSubscriber._error @ ConnectableObservable.js:72
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error @ Subscriber.js:60
push../node_modules/rxjs/_esm5/internal/operators/delay.js.DelaySubscriber._error @ delay.js:77
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error @ Subscriber.js:60
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error @ Subscriber.js:80
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error @ Subscriber.js:60
(anonymous) @ index.cjs.js:4879
cb_1 @ index.cjs.js:4485
exceptionGuard @ index.cjs.js:694
push../node_modules/@firebase/database/dist/index.cjs.js.EventList.raise @ index.cjs.js:9771
push../node_modules/@firebase/database/dist/index.cjs.js.EventQueue.raiseQueuedEventsMatchingPredicate_ @ index.cjs.js:9725
push../node_modules/@firebase/database/dist/index.cjs.js.EventQueue.raiseEventsForChangedPath @ index.cjs.js:9709
(anonymous) @ index.cjs.js:12741
(anonymous) @ index.cjs.js:11852
push../node_modules/@firebase/database/dist/index.cjs.js.PersistentConnection.onDataMessage_ @ index.cjs.js:12107
push../node_modules/@firebase/database/dist/index.cjs.js.Connection.onDataMessage_ @ index.cjs.js:11390
push../node_modules/@firebase/database/dist/index.cjs.js.Connection.onPrimaryMessageReceived_ @ index.cjs.js:11384
(anonymous) @ index.cjs.js:11285
push../node_modules/@firebase/database/dist/index.cjs.js.WebSocketConnection.appendFrame_ @ index.cjs.js:10888
push../node_modules/@firebase/database/dist/index.cjs.js.WebSocketConnection.handleIncomingFrame @ index.cjs.js:10938
mySock.onmessage @ index.cjs.js:10835
wrapFn @ zone.js:1332
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask @ zone.js:423
push../node_modules/zone.js/dist/zone.js.Zone.runTask @ zone.js:195
push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask @ zone.js:498
invokeTask @ zone.js:1744
globalZoneAwareCallback @ zone.js:1770
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