Noticed my Cloud Functions get initialized twice

[akauppi]

This was quite surprising.

It seems that when I start Firebase Emulator, my functions/index.js is read twice.

The invocations are right after each other, and I don't call any of the services, yet.

First time looks legitimate. The functions are initialized.

Right after the Issues? Report them at... logging line, there's a second import.

This time, it's with some added env.vars:

FUNCTION_TARGET: 'cloudLoggingProxy_v0',
FUNCTION_SIGNATURE_TYPE: 'http',
K_SERVICE: 'cloudLoggingProxy_v0',
K_REVISION: '1',
PORT: '80',

What is going on?

One could do time-consuming initialisations in the functions body, and being called twice is surprising.

[akauppi]

Launching Docker... 🐳
i  emulators: Starting emulators: auth, functions, firestore
⚠  Your requested "node" version "14 || ^16" doesn't match your global version "16"
i  firestore: Firestore Emulator logging to firestore-debug.log
i  ui: Emulator UI logging to ui-debug.log
i  functions: Watching "/work/functions" for Cloud Functions...
>  !___FUNCTIONS LOADED___! {
>    node: '/usr/local/bin/node',
>    USER: 'user',
>    FIREBASE_EMULATORS_PATH: '/root/.cache/firebase/emulators',
>    NODE_VERSION: '16.5.0',
>    HOSTNAME: '3130dacaa822',
>    YARN_VERSION: '1.22.5',
>    SHLVL: '1',
>    HOME: '/root',
>    GROUP: 'mygroup',
>    PATH: '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin',
>    PWD: '/work',
>    IS_FIREBASE_CLI: 'true',
>    TZ: 'UTC',
>    GCLOUD_PROJECT: 'demo-2',
>    FUNCTIONS_EMULATOR: 'true',
>    FIREBASE_CONFIG: '{"storageBucket":"demo-2.appspot.com","databaseURL":"https://demo-2.firebaseio.com","projectId":"demo-2"}',
>    FIRESTORE_EMULATOR_HOST: '0.0.0.0:6767',
>    FIREBASE_AUTH_EMULATOR_HOST: '0.0.0.0:9100'
>  }
✔  functions[us-central1-cloudLoggingProxy_v0]: http function initialized (http://0.0.0.0:5002/demo-2/us-central1/cloudLoggingProxy_v0).
✔  functions[us-central1-userInfoShadow_2]: firestore function initialized.

┌─────────────────────────────────────────────────────────────┐
│ ✔  All emulators ready! It is now safe to connect your app. │
│ i  View Emulator UI at http://0.0.0.0:4000                  │
└─────────────────────────────────────────────────────────────┘

┌────────────────┬──────────────┬───────────────────────────────┐
│ Emulator       │ Host:Port    │ View in Emulator UI           │
├────────────────┼──────────────┼───────────────────────────────┤
│ Authentication │ 0.0.0.0:9100 │ http://0.0.0.0:4000/auth      │
├────────────────┼──────────────┼───────────────────────────────┤
│ Functions      │ 0.0.0.0:5002 │ http://0.0.0.0:4000/functions │
├────────────────┼──────────────┼───────────────────────────────┤
│ Firestore      │ 0.0.0.0:6767 │ http://0.0.0.0:4000/firestore │
└────────────────┴──────────────┴───────────────────────────────┘
  Emulator Hub running at localhost:4400
  Other reserved ports: 4500

Issues? Report them at https://github.com/firebase/firebase-tools/issues and attach the *-debug.log files.
 
>  !!! ---- LOADED --- !!!
>  (node:60) ExperimentalWarning: stream/web is an experimental feature. This feature could change at any time
>  (Use `node --trace-warnings ...` to show where the warning was created)
>  !___FUNCTIONS LOADED___! {
>    node: '/usr/local/bin/node',
>    USER: 'user',
>    FIREBASE_EMULATORS_PATH: '/root/.cache/firebase/emulators',
>    NODE_VERSION: '16.5.0',
>    HOSTNAME: '3130dacaa822',
>    YARN_VERSION: '1.22.5',
>    SHLVL: '1',
>    HOME: '/root',
>    GROUP: 'mygroup',
>    PATH: '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin',
>    PWD: '/work',
>    IS_FIREBASE_CLI: 'true',
>    TZ: 'UTC',
>    GCLOUD_PROJECT: 'demo-2',
>    FUNCTIONS_EMULATOR: 'true',
>    FIREBASE_CONFIG: '{"storageBucket":"demo-2.appspot.com","databaseURL":"https://demo-2.firebaseio.com","projectId":"demo-2"}',
>    FUNCTION_TARGET: 'cloudLoggingProxy_v0',
>    FUNCTION_SIGNATURE_TYPE: 'http',
>    K_SERVICE: 'cloudLoggingProxy_v0',
>    K_REVISION: '1',
>    PORT: '80',
>    FIRESTORE_EMULATOR_HOST: '0.0.0.0:6767',
>    FIREBASE_AUTH_EMULATOR_HOST: '0.0.0.0:9100'
>  }
i  functions: Beginning execution of "us-central1-cloudLoggingProxy_v0"
>  {"verifications":{"app":"MISSING","auth":"MISSING"},"logging.googleapis.com/labels":{"firebase-log-type":"callable-request-verification"},"severity":"INFO","message":"Callable request verification passed"}
>  {"severity":"DEBUG","message":"Logging request from: (unknown user)"}
i  functions: Finished "us-central1-cloudLoggingProxy_v0" in ~1s
>  Woke up Cloud Function 'cloudLoggingProxy_v0' - took 1913ms
>  !!! ---- LOADED --- !!!
>  (node:86) ExperimentalWarning: stream/web is an experimental feature. This feature could change at any time
>  (Use `node --trace-warnings ...` to show where the warning was created)
i  functions: Beginning execution of "us-central1-cloudLoggingProxy_v0"
>  {"verifications":{"app":"MISSING","auth":"MISSING"},"logging.googleapis.com/labels":{"firebase-log-type":"callable-request-verification"},"severity":"INFO","message":"Callable request verification passed"}
>  {"severity":"DEBUG","message":"Logging request from: (unknown user)"}
i  functions: Finished "us-central1-cloudLoggingProxy_v0" in ~1s
>  Woke up Cloud Function 'cloudLoggingProxy_v0' - took 84ms

[hiranya911]

Should probably report at https://github.com/firebase/firebase-tools which is responsible for emulators and CLI.

[akauppi]

Sure. I somehow thought Admin SDK alpha was involved, but it's not.