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

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')