Emulator UI should not connect to 0.0.0.0 for emulators

In firebase.json, it is possible to specify 0.0.0.0 for host for each emulator. This tells an emulator to listen on all IPv4 interfaces (including 127.0.0.1, the device's public network IP, etc.).

{
  // ...
  "emulators": {
    "firestore": {"host": "0.0.0.0", "port": 8080},
  }
}

However, with this setup, the Emulator UI attempts to send requests http://0.0.0.0:8080 to reach Firestore in the Firestore viewer. This is invalid since 0.0.0.0 is a non-routable address but some browsers / platforms (such as Chrome on Linux) special cases it to mean the same as 127.0.0.1. On other browsers / platforms (such as Chrome on Windows), this fails with errors like net::ERR_ADDRESS_INVALID.

Instead, the Emulator UI should change it to 127.0.0.1 when constructing the URL. Similarly, the Emulator UI should connect to ::1 (IPv6 local) when :: (IPv6 zero) is specified.

@yuchenshi

@yuchenshi I would like to pick this up. As per my understanding, I think simply changing host to 127.0.0.1 in emulators would make it work. Please correct me if something else also needs to be done.

@gautamsingal

@gautamsingal Of course! We welcome PRs addressing this. As noted in the last paragraph, please make sure to take care of both 0.0.0.0 and :: for completeness. The best place to make the change is in server.js.

@yuchenshi

@yuchenshi Thanks! Picking this up

@yuchenshi

@yuchenshi I tried but unable to do. Can you please guide me in this?

I'm not sure if WSL2 is part of the official supported platforms but I was unable to get any host options working when they work fine elsewhere. Using a configuration like below should work, but the emulator UI and other front-end code can't connect. I would be happy to also help.

  "firestore": {
    "host": "127.0.0.1",
    "port": 8080
  },

In server.js there are the lines

Object.entries(emulators).forEach(([name, info]) => {
      json[name] = {
        hostAndPort: hostAndPort(info.host, info.port),
        ...info,
      }
    });

That host needs be checked for '0.0.0.0' and '::' If they are they should be changed to "localhost". All this logic is done using json so it makes it a bit more tricky.

I tried doing it quickly, but got stuck getting the development environment going in windows. I was getting an SCSS error about material/theme/mixins and dind't have time to work through it.

firebase#286: Emulator UI should not connect to 0.0.0.0 for emulators

@blastdan

@blastdan Thanks for the feedback!

@blastdan

@blastdan Was it a issue with node-sass and fsevents by any chance? When setting up Windows environments I commonly need to force a install and rebuild.

npm i -f fsevents
npm rebuild node-sass

@moneal

@moneal @blastdan I think it's #210 -- a known issue. However, we still haven't found a great cross-platform solution and would appreciate any help there. Either way, let's move the discussion there.

firebase#286: Emulator UI should not connect to 0.0.0.0 for emulators

Fixed by #312. This will be included in the next release.

@yuchenshi

@yuchenshi Is there any way to track when a new release is made?

Thanks!

@blastdan

@blastdan Yes! The Emulator UI releases with the Firebase CLI, so you can head to https://github.com/firebase/firebase-tools and click on the Watch dropdown menu and select "Releases only". GitHub will notify you if there is a new release to the Firebase CLI. This will be likely included in the next one or two Firebase CLI versions.

FYI, this went out with Firebase CLI v8.6.0.

I am still getting this error using an event listener on the realtime database emulator. See Chrome console errors:
GET http://0.0.0.0:9000/.lp?id=1&pw=cYijYEVq0A&ser=81095532&ns=joydominoes-default-rtdb net::ERR_ADDRESS_INVALID

firebase.json says:
"emulators": {
...
"database": {
"host": "0.0.0.0"
}
...
}

firebase -V says
9.13.1

various hackery to get my database events on the client to work at al…

this breaks firebase/firebase-tools#1898

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Emulator UI should not connect to 0.0.0.0 for emulators #286

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Emulator UI should not connect to 0.0.0.0 for emulators #286

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gautamsingal commented on Jun 12, 2020

yuchenshi commented on Jun 12, 2020

gautamsingal commented on Jun 12, 2020

gautamsingal commented on Jun 18, 2020

moneal commented on Jun 18, 2020

blastdan commented on Jun 18, 2020

gautamsingal commented on Jun 18, 2020

moneal commented on Jun 18, 2020

yuchenshi commented on Jun 18, 2020

yuchenshi commented on Jun 18, 2020

blastdan commented on Jun 18, 2020

yuchenshi commented on Jun 18, 2020

yuchenshi commented on Jul 15, 2020

arimwilson commented on Jun 26, 2021

chbybnwr commented on Feb 29, 2024

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