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Firestore indexDB persistence corrupted after user "Clear site data" #8593

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entrenadorhispano opened this issue Oct 24, 2024 · 3 comments
Open

Firestore indexDB persistence corrupted after user "Clear site data" #8593

entrenadorhispano opened this issue Oct 24, 2024 · 3 comments
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@dconeybe
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api: firestore bug

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@entrenadorhispano
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Operating System

Windows 11, Chrome, Edge, Android, iOS

Environment (if applicable)

Chrome all major versions, Edge, Safari iOS tested on 16

Firebase SDK Version

10.14

Firebase SDK Product(s)

Firestore

Project Tooling

Vanilla JS.
Also tried on other web frameworks.

Detailed Problem Description

If Firestore persistence is active and a doc is cached. Then the user clears the site data, and and doc is updated on backend.
Cache gets corrupted and now the firestore listener returns NULL document FROM CACHE

I, leave some concrete steps for reproduction below.
(You have to put your own firebase_api_key for security)

Firebase.err.mp4

Steps and code to reproduce issue

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta
      name="viewport"
      content="width=device-width, initial-scale=1.0"
    />
    <title>Firebase Cache Bug</title>
  </head>

  <script type="module">
    //For this sample Im using vanilla JS and firebase from CDN.
    //But the same error was tested on sveltekit + vite and firebase js sdk.

    import { initializeApp } from 'https://www.gstatic.com/firebasejs/10.14.1/firebase-app.js';
    import {
      initializeFirestore,
      CACHE_SIZE_UNLIMITED,
      persistentLocalCache,
      persistentMultipleTabManager,
      onSnapshot,
      doc,
      getDoc,
      clearIndexedDbPersistence,
    } from 'https://www.gstatic.com/firebasejs/10.14.1/firebase-firestore.js';

    import {
      signInWithEmailAndPassword,
      onAuthStateChanged,
    } from 'https://www.gstatic.com/firebasejs/10.14.1/firebase-auth.js';

    const firebaseConfig = {
      //Change this to your FIREBASE API KEYS
    };

    // Initialize Firebase
    const app = initializeApp(firebaseConfig);
    const db = initializeFirestore(app, {
      localCache: persistentLocalCache(),
    });

    // You can use this function to clear all the persistence on your IndexedDB.
    // This will fix the problem
    //
    //
    /*clearIndexedDbPersistence(db);*/

    //Getting the documentData
    const docRef = doc(db, 'tests', 'test_document');
    const unsub = onSnapshot(docRef, (doc) => {
      console.log('Current doc: ', doc);
      if (doc.exists()) {
        document.getElementById('display').innerHTML = doc.data().data;
      }
      document.getElementById('diplay-from-cache').innerHTML = JSON.stringify(
        doc.metadata,
        null,
        2
      );
    });
  </script>

  <body>
    <h1>Firebase BUG</h1>
    <blockquote>
      If user clear site data and document is modified from outside, firestore
      IndexedDB cache return null document from cache.
    </blockquote>
    <p>Setup:</p>
    <ul>
      <li>1. Change your FIREBASE API KEYS</li>
      <li>2. Create a document on tests/test_document {data:'Hello world'}</li>
    </ul>

    <hr />

    <ul>
      <li>1. Refresh page (To cache the doc)</li>
      <li>3. Clear site data</li>
      <li>4. Modify the document on firebase console</li>
      <li>5. Refresh</li>
      <li>6. Refresh Again... (Doc return blank from cache:true)</li>
    </ul>

    <div class="card">
      <h2 class="card-header">DocData:</h2>
      <p id="display"></p>
      <h2 class="card-header">Metadata:</h2>
      <pre id="diplay-from-cache"></pre>
    </div>
    <pre id="display-auth"></pre>
  </body>
</html>

<style>
  .card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    border-radius: 0.5rem;
    box-shadow: 0 0 1rem rgba(0, 0, 0, 0.2);
  }
  .card-header {
    font-weight: bold;
  }
</style>
@entrenadorhispano entrenadorhispano added new A new issue that hasn't be categoirzed as question, bug or feature request question labels Oct 24, 2024
@google-oss-bot
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I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

@looptheloop88 looptheloop88 added api: firestore and removed needs-triage new A new issue that hasn't be categoirzed as question, bug or feature request labels Oct 24, 2024
@dconeybe dconeybe self-assigned this Oct 24, 2024
@looptheloop88
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Hi @entrenadorhispano, thank you for sharing a very detailed reproduction steps, video recording and the code snippet. I was able to easily reproduce same the behavior. I tried both the SDK version that you used and the latest 11.0.1 version. I also verified that adding clearIndexedDbPersistence(db) will fix the issue.

I will inform our engineering team of this issue. Please keep an eye out for any additional information they may provide.

@entrenadorhispano
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Another Part of the Bug

I found another part of this bug.

Once the document cache is corrupted, even getDocFromServer() will fetch the cached, non-existent document.
So there's no way to create a fallback.

Severity of the Bug

I would also advise that this bug is severe and makes Firestore offline persistence unusable in production web apps.
(Perhaps some companies just haven't noticed yet.)

For example:
Production apps that depend on fetching user data to display content or redirect to "create user data" may easily overwrite and lose user documents if the user deletes their browser history (which users do frequently).

In JS Frameworks, It May Be Even Worse

I also tried the same process in frameworks like Svelte. There, you don't even have to modify data in the console. Simply clearing site data is enough to trigger this bug and start serving cached, non-existent documents.

Thank you very much for your support and time in dealing with this.

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@google-oss-bot @dconeybe @looptheloop88 @entrenadorhispano