Firebase Test Call API

test-call.ts

import * as functions from 'firebase-functions';
import * as rp from 'request-promise';
import { google } from 'googleapis';


let projectId: string = "my-firebase-project-id";

export let testFunctions = functions.pubsub.topic("testfunctions").onPublish(async (message, context) => {

    let functionsToExecute = ["functionA", "functionB", "functionC", "functionD",]

    let token: string = await generateAccessToken();

    for (let i in functionsToExecute) {
        let functionName = functionsToExecute[i];
        await testCallFunction(functionName, token);
    }
});

async function generateAccessToken(): Promise<string> {
    var scopes = ["https://www.googleapis.com/auth/cloud-platform"];

    const serviceAccountEmail = functions.config().priming.email;
    const serviceAccountPrivateKey = functions.config().priming.private_key.replace(/\\n/g, '\n');

    // Authenticate a JWT client with the service account.
    var jwtClient = new google.auth.JWT(
        serviceAccountEmail,
        null,
        serviceAccountPrivateKey,
        scopes
    );

    // Use the JWT client to generate an access token.
    let accessToken: string;
    let credential = await jwtClient.authorize();
    return credential.access_token;
}

async function testCallFunction(name: string, token: string) {
    const options = {
        method: 'POST',
        uri: `https://content-cloudfunctions.googleapis.com/v1beta2/projects/${projectId}/locations/us-central1/functions/${name}:call`,
        body: { "data": "{\"data\": {\"test\": true}}" },
        headers: {
            Authorization: `Bearer ${token}`
        },
        json: true
    }
    return await rp(options);
}