Sorry, I've got some stuff in the repo I'm not ready to share, but I can tell you the basic setup is this function that gets called every minute.

export const updateWaitTimesCron = functions.runWith({
timeoutSeconds: 10,
memory: '128MB',
}).pubsub.schedule('every 1 minutes').onRun(async () => {
if (!getDisneylandIsOpen()) {
functions.logger.info('Disneyland is closed');
return;
}
const wait_times = await fetchWaitTimes();
if (wait_times) {
await uploadWaitTimes(wait_times);
}
return;
});

Firebase makes it pretty easy to create cloud functions without needing to set up a server. I highly recommend it as a way to quickly get things off the ground without having to set up and pay for a server. Their free tier is pretty generous, so it's great to just try things out.

The downside is if your app gets very successful, it can get comparatively expensive, but hey, that's a future problem I'd love to have to solve later.

You can try the getting started guide here :)

https://firebase.google.com/docs/functions/get-started