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Scheduling Cloudflare builds on a cron job


Let me begin by explaining my background in constructing scripts for my web sites.

I’ve used many various construct techniques for this weblog, and in some way they all the time appear to have the ability to enhance and change into simpler.

The historical past of this weblog construct techniques:

  • Handbook builds and uploads
  • IFTT hook to set off Netlify construct
  • GitHub motion construct and add step to Netlify
  • GitHub actions cron and add to Netlify
  • GitHub cron add to Cloudflare

And the newest:

  • Cloudflare employee on a cron

These are quite a lot of totally different techniques, and every one has its sturdy factors.



What’s the objective right here?

To find out what is required, it is good to take a look at the precise objective of the construct system.

For me, it is about having the ability to set off the construct each morning, so the newest article turns into lively.
Then I additionally need it to construct each time I push new adjustments.

With this being mentioned, the final half is the simpler one. Cloudflare pages robotically construct each time you push to the grasp department, in order that’s already good to go.

For the cron, they launched one thing cool referred to as Deploy hooks. This can be a hook we will allow on every undertaking.
The hook gives you a URL you need to use to set off a construct.

Cloudflare deploy hook

You may give this deploy hook a brand new and which department it ought to construct.

As soon as finished, you will get a URL you may copy.

From right here, there are a number of methods of triggering the URL, however since we’re already in Cloudflare, we will create a cron employee to start out the deploy hook.



A Cloudflare cron employee

First, open up the employee’s part in Cloudflare.
Then click on so as to add a brand new Service.

Cloudflare worker

I used an HTTP handler operate, as we’ll be making a scheduled one.

When you observe the steps, you will get to the precise code for the employee.

I used one of many default examples to put up to a particular URL.

async operate gatherResponse(response) {
  const { headers } = response;
  const contentType = headers.get('content-type') || '';
  if (contentType.contains('utility/json')) {
    return JSON.stringify(await response.json());
  } else if (contentType.contains('utility/textual content')) {
    return response.textual content();
  } else if (contentType.contains('textual content/html')) {
    return response.textual content();
  } else {
    return response.textual content();
  }
}

async operate handleRequest() {
  const init = {
    methodology: 'POST',
    headers: {
      'content-type': 'utility/json;charset=UTF-8',
    },
  };
  const response = await fetch('{YOUR_DEPLY_HOOK}', init);
  const outcomes = await gatherResponse(response);
  return new Response(outcomes, init);
}

addEventListener('fetch', (occasion) => {
  return occasion.respondWith(handleRequest());
});
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This setup will add a listener to the fetch request and execute the handleRequest operate.

That, in return, will probably be logged because the response (elective step).

The factor to notice right here is the addEventListener. That is what triggers the hook.

Setting this to fetch makes it accessible as a URL endpoint, so it is best to have the ability to run open the employee’s URL and set off the construct.

Requesting the cloud flare worker

Urgent the button, you see within the screenshot above will set off this webhook.
You must see the deploy triggered for those who go to your deploys now.

To make this entire factor work on a schedule, you may merely add a brand new set off.

Click on Triggers on the high inside the employee’s element display screen and add a brand new Cron set off.

Cloudflare cron trigger

With this in place, we now have to return and edit our employee’s code to just accept this set off.

Keep in mind how we used fetch as an possibility earlier than?
To work with a cron, you must use scheduled as an possibility.

Notice: You may nonetheless use each if you would like too

addEventListener('scheduled', (occasion) => {
  occasion.waitUntil(handleRequest());
});

addEventListener('fetch', (occasion) => {
  return occasion.respondWith(handleRequest());
});
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And that is it, we now have a cron triggered employee!

This entire course of took tremendous rapidly and was a breeze.
To this point the simplest and quickest construct system I’ve used.



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