generators and promise all

test.js

async function invokePing(ow, cnt) {
  log.info(`${cnt}: invoking delayed_ping`);
  const result = await ow.actions.invoke({
    blocking: true,
    name: 'delayed_ping',
    result: true,
  });
  log.info(`${cnt}: done.`);
  return result;
}

function *invokePings() {
  const ow = openwhisk();
  for (let i = 0; i < 4; i++) {
    yield invokePing(ow, i);
  }
}

async function run(params) {
  ...
  const pings = await Promise.all(Array.from(invokePings()));
  ...
}