firebase deploy to custom region (eu-central1)

Question

is there a way to specify the Region/Zone where my firebase functions will be deployed.

Actually i didn't found anything about that in the documentation and my functions are always deployed to us-central1 but i want to have it on eu-central1...

Is it possible to set it in the Firebase - Config - File?

{
  "database": {
    "rules": "database.rules.json"
  },
  "hosting": {
    "public": "public",
    "rewrites": [
      {
        "source": "**",
        "destination": "/index.html"
      }
    ]
  }
}

I also had a look on the cli options but i did not found anything there.

The Firebase Project itself is correctly set to an european Region o.O

thanks in advance

Answer 1

firebaser here

Update (2018-07-25):

It is now possible to specify the region for your Cloud Functions in Firebase you specify that region in your code and deploy the change. E.g.:

exports.myStorageFunction = functions
    .region('europe-west1')
    .storage
    .object()
    .onFinalize((object) => {
      // ...
    });

For full details see the Firebase documentation on Cloud Functions locations (from where I got the above snippet) and modifying the region of a deployed function.

Answer 2

From docs: https://firebase.google.com/docs/functions/locations

Now available in the following regions:

• us-central1 (Iowa)
• us-east1 (South Carolina)
• europe-west1 (Belgium)
• asia-northeast1 (Tokyo)

Best Practices for Changing Region

// before
const functions = require('firebase-functions');

exports.webhook = functions
    .https.onRequest((req, res) => {
            res.send("Hello");
    });

// after
const functions = require('firebase-functions');

exports.webhookEurope = functions
    .region('europe-west1')
    .https.onRequest((req, res) => {
            res.send("Hello");
    });

Answer 3

To use the same custom region for all your functions, you do something like this.

import * as functions from 'firebase-functions';

const regionalFunctions = functions.region('europe-west1');

export const helloWorld = regionalFunctions.https.onRequest((request, response) => {
 response.send("Hello from Firebase!");
});

export const helloWorld2 = regionalFunctions.https.onRequest((request, response) => {
 response.send("Hello from Firebase 2!");
});

Answer 4

To have Firebase functions deployed to a region also work in local emulation, one must initialise the client as such:

const functions = LOCAL ? firebase.app().functions(/*functionsRegion*/) :  
  firebase.app().functions(functionsRegion);

const fun = functions.httpsCallable('your_function_name');

i.e. the code is not the same. Adding a region in the emulated case makes the calls get lost, without an error.

LOCAL is a client side value I've made to know, whether the back end is running in the cloud, or set up for local emulation.

Surely, this is a corner case that Firebase will iron away?

firebase-tools 8.6.0, firebase 7.16.1

---

Addendum:

The above is meant for browser (wasn't stated). I since stopped using httpsCallables since they require an online connection. Interfacing via Firebase databases, on the other hand, is offline friendly and as such leads to a more robust system.

Answer 5

"rewrites": [
  {
    "source": "**",
    "run": {
      "serviceId": "<service id>",
      "region": "europe-west1"
    }
  }
]
},