Firebase: How to run 'HTTPS callable functions' locally using Cloud Functions shell? - firebase

Question

I couldn't find a solution for this use case in Firebase official guides.
They are HTTPS callable functions
Want to run Functions locally using Cloud Functions shell to test
Functions save received data to Firestore
The 'auth' context information is also needed
My code as below. Thanks in advance.
Function :
exports.myFunction = functions.https.onCall((data, context) => {
const id = context.auth.uid;
const message = data.message;
admin.firestore()...
// Do something with Firestore //
});
Client call :
const message = { message: 'Hello.' };
firebase.functions().httpsCallable('myFunction')(message)
.then(result => {
// Do something //
})
.catch(error => {
// Error handler //
});

Answer 1

There is an api exactly for this use case, see here.
I used it in javascript(Client side) as follows -
button.addEventListener('click',()=>{
//use locally deployed function
firebase.functions().useFunctionsEmulator('http://localhost:5001');
//get function reference
const sayHello = firebase.functions().httpsCallable('sayHello');
sayHello().then(result=>{
console.log(result.data);
})
})
where sayHello() is the callable firebase function.
When the client is an android emulator/device. Use 10.0.2.2 in place of localhost.
Also the code for flutter would be like so -
CloudFunctions.instance.useFunctionsEmulator(origin: 'http://10.0.2.2:5000')
.getHttpsCallable(functionName: 'sayHello')

Answer 2

Cloud functions have emulators for that. Check this link it can suite your case. Its not functions shell, but for testing purposes i think it can still works for you

Answer 3

In newer versions of firebase, this is the way:
import firebaseApp from './firebaseConfig';
import { getFunctions, httpsCallable, connectFunctionsEmulator } from 'firebase/functions';
const functions = getFunctions(firebaseApp);
export async function post(funcName, params) {
connectFunctionsEmulator(functions, 'localhost', '5001'); // DEBUG
let func = httpsCallable(functions, funcName);
let result = await func(params);
return result.data;
}