Firebase functions emulator ignores region

[JaapWeijland]

[REQUIRED] Environment info

firebase-tools:
9.2.0

Platform:
macOS

[REQUIRED] Test case

export const api = region('europe-west3').https.onRequest(server);

When starting the emulator, the emulator correctly outputs the following URL:

✔ functions[api]: http function initialized (http://localhost:5000/**[some-project]**/europe-west3/api).

However, when visiting that URL, a 404 is given. Going to the following URL works however:

http://localhost:5000/**[some-project]**/us-central1/api

[REQUIRED] Steps to reproduce

See above

[REQUIRED] Expected behavior

Hitting the europe-west3 URL working like the us-central1 version does.

[REQUIRED] Actual behavior

The europe-west3 version hits a 404, while us-central1 works.

[samtstern]

@JaapWeijland I am not able to reproduce this behavior. Here are my two functions:

const functions = require("firebase-functions");

exports.helloWorld = functions.https.onRequest((req,res) => {
    res.send("Hello, America\n");
});

exports.helloEurope = functions.region('europe-west3').https.onRequest((req, res) => {
    res.send("Hello, Europe\n");
});

When I run firebase emulators:start I see these logs (among others):

✔  functions[helloWorld]: http function initialized (http://localhost:5001/fir-dumpster/us-central1/helloWorld).
✔  functions[helloEurope]: http function initialized (http://localhost:5001/fir-dumpster/europe-west3/helloEurope).

I am able to curl both functions:

$ curl http://localhost:5001/fir-dumpster/us-central1/helloWorld
Hello, America

$ curl http://localhost:5001/fir-dumpster/europe-west3/helloEurope
Hello, Europe

Is there more to your situation? Do you possibly have two functions with the same name in different regions? If so that's a known limitation of the emulator right now.

[JaapWeijland]

Thanks for your answer! I oversimplified my example a bit.

What I actually have, is the following:

import {NestFactory} from '@nestjs/core';
import {AppModule} from './app.module';
import * as helmet from 'helmet';

import {ExpressAdapter} from '@nestjs/platform-express';
import * as express from 'express';
import {region} from 'firebase-functions';

const server = express();

server.get('/', (req, res) => {
    res.send('lol!');
});

// export const createNestServer = async (expressInstance: express.Express) => {
//     const _app = await NestFactory.create(AppModule, new ExpressAdapter(expressInstance), {
//         cors: true,
//     });
//     // app.use(helmet()); // protect from HTTP vulnerabilities
//     await _app.init();
// };

// createNestServer(server)
//     .then((v) => console.log('Nest Ready'))
//     .catch((err) => console.error('Nest broken', err));

export const api = region('europe-west3').https.onRequest(server);

export const europe = region('europe-west3').https.onRequest((req, res) => {
    res.send('Hello Europe');
});

I deliberately left the comments there. As you see, I'm experimenting with NestJS on Firebase. If filtered the issue down to be associated with Express though, so I'm not sure if NestJS has to do with anything here.

As you see, I gave the Express server to the endpoint to handle the traffic. For testing purposes, I added a regular signature to another endpoint. the api endpoint does not work with the europe-west3 region, however, it works with us-central1. The europe endpoint does work as intended.

So, I think it has something to do with Express.

Edit:

My compiled JS looks like this:

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.europe = exports.api = void 0;
const express = require("express");
const firebase_functions_1 = require("firebase-functions");
const server = express();
server.get('/', (req, res) => {
    res.send('lol!');
});
exports.api = firebase_functions_1.region('europe-west3').https.onRequest(server);
exports.europe = firebase_functions_1.region('europe-west3').https.onRequest((req, res) => {
    res.send('Hello Europe');
});

[samtstern]

@JaapWeijland ah that helps thanks! I was able to roll a fix into this PR I was already working on:
#3033

[samtstern]

@JaapWeijland can you show me the smallest test case that reproduces the issue on the latest version?

[JaapWeijland]

Ha Sam, I already deleted my comment. I was still using the old version when I thought I installed the newer one. I can confirm that latest version fixes the issue.

[samtstern]

@JaapWeijland oh thank you! I use GitHub through my email mostly so I didn't notice it was deleted. Appreciate the super fast reply.