firebase.loadFirestoreRules timing out in emulator

[brianmhunt]

Describe your environment

• Operating System version: _____Mac

$ sw_vers
ProductName:	Mac OS X
ProductVersion:	10.14
BuildVersion:	18A391
$ node --version
v10.13.0

• Browser version: _____N/A
• Firebase SDK version: _____

    "@firebase/testing": "^0.3.3",
    "firebase": "^5.5.9",
    "firebase-admin": "^6.2.0",
    "firebase-functions": "^2.1.0",
    "firebase-functions-test": "^0.1.5",
    "firebase-tools": "^6.1.1"

• Firebase Product: _____ emulator https://firebase.google.com/docs/firestore/security/test-rules-emulator

Describe the problem

It appears that successive calls to firebase.loadFirestoreRules are increasingly slower, to the point where it quickly becomes unusable.

This is a regression, though I have not been able to pinpoint where, and might be Mac specific.

Relevant Code:

Minimum working reproduction here: brianmhunt/bug-reports#firestore-emulator-timeouts

Steps to reproduce:

Sample output from the reproduction repo:

  firebase emulator
    ✓ does not time out (101ms)
    ✓ does not time out 2 (968ms)
    ✓ does not time out 3 (1316ms)
    ✓ does not time out 4 (2168ms)
    ✓ does not time out 5 (4717ms)
    ✕ does not time out 6 (5009ms)

  ● firebase emulator › does not time out 6

    Timeout - Async callback was not invoked within the 5000ms
    timeout specified by jest.setTimeout.

    Rules loaded in 21 ms

  console.log test/firebase.test.js:17
    App initialized in 2 ms

  console.log test/firebase.test.js:14
    Rules loaded in 900 ms

  console.log test/firebase.test.js:17
    App initialized in 0 ms

  console.log test/firebase.test.js:14
    Rules loaded in 1603 ms

  console.log test/firebase.test.js:17
    App initialized in 0 ms

  console.log test/firebase.test.js:14
    Rules loaded in 2520 ms

  console.log test/firebase.test.js:17
    App initialized in 0 ms

  console.log test/firebase.test.js:14
    Rules loaded in 4417 ms

  console.log test/firebase.test.js:17
    App initialized in 1 ms

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[brianmhunt]

Having narrowed down the issue, it can be much simpler to reproduce with:

    await firebase.loadFirestoreRules({ projectId, rules }) // ~20 ms
    await firebase.loadFirestoreRules({ projectId, rules }) // ~900 ms
    await firebase.loadFirestoreRules({ projectId, rules }) // ~1600 ms
    await firebase.loadFirestoreRules({ projectId, rules }) // ~2500 ms
    await firebase.loadFirestoreRules({ projectId, rules }) // ~4400 ms

So the time to load the rules is roughly doubling with every call.

[brianmhunt]

One workaround is to set a very high timeout e.g. in the case of jest jest.setTimeout(50000). This is of course less than ideal.

[ryanpbrewster]

This is likely the same issue that was fixed for the Firestore SDK in #1390

I'll do the same thing in the rules loader

[ryanpbrewster]

As a workaround, you can set the environment variable FIREBASE_FIRESTORE_EMULATOR_ADDRESS=127.0.0.1:8080 to force the testing SDK to connect via ipv4. That should resolve the timeouts.