cgenuity

Still a bit rough, but working on https://delaykit.dev.

The Node.js ecosystem doesn't seem to have a good primitive for app-level, per-event scheduling (things like "expire this abandoned cart in 24h" or "debounce 50 profile updates into one reindex"). Cron is too broad and you still have write the polling/scheduler code yourself. Job queues optimize for throughput and usually bolt `run_at` on as an afterthought. Workflow engines are overkill for a simple "do this thing later, tied to this user" and want you to adopt their runtime.

DelayKit aims to be the in-between. It is backed by Postgres and uses keys like `dk.schedule("expire-cart", { key: cartID, delay: "24h" })`. Handlers get the key, not a payload, and fetch fresh state at fire time. This way DelayKit is only responsible for the "hey remember you have to do this thing for cart X" part.

I'm working through making it production-ready at the moment, the initial passes were more around figuring out the API and general architecture. Thoughts and comments greatly appreciated!

Seeing the same, thanks. Looks like updown.io is having an issue with TLS. It also lives here if you wanted to take a look: https://updown.io/fj8q

I understand Posthook may not be the best solution for everyone's scheduled tasks. It seems like for that project you had the expertise, time, and risk tolerance to set up that one DO server to handle all your needs. Other developers may be in a different situation and may find Posthook useful.

> How much would it cost to do 3 million requests per month?

If you want to use Posthook to schedule 3 million requests a month please email support [at] posthook.io and we can work out a special plan and support contract. Do keep in mind that background jobs and scheduled jobs are two different things and what I aim for Posthook to solve are scheduled jobs. I suspect a big part of those 3 million were background jobs.

> Also how would you set up custom retry policies?

The retry policy is fixed at the moment but it seems like this a common request so I want to roll that feature out soon.

Thank you! Pricing is still subject to change as I get more data from the market but the aim was to price it by the value it provides developers over just going off what the servers cost to run.

Azure Scheduler seems to be aimed towards recurring tasks. So a scheduled request from Posthook is more actionable than a recurring execution from Azure Scheduler for the use cases I'm aiming to help solve with Posthook (think reminders). Also I'm hoping Posthook is a simpler offering in terms of pricing and integration.

Thanks! Happy to provide value, feel free to use the live chat or the support email for any specific questions or requests you might have.

Thank you! I was surprised something like this didn't exist when I needed it. Feel free to use the live chat or email support for any specific questions you have.

Agreed, thank you :). Added to the board.

Thanks sebringj! I agree and the rise of serverless was definitely one of the motivating factors to me building this service. Security is handled through signing the payload that includes a timestamp with an HMAC to prevent replay attacks as well.

Thanks! I do heavily use Google Cloud Pub/Sub but it does not support scheduling items so I only schedule items when they are due for processing.

If the service outage is on Posthook's side, they would be retried.

If the outage is on the customer's side, all hooks that were attempted during the outage would be marked as failed. I plan on adding a feature that will allow the developer to fire off again all failed hooks in a given time period.

It does not support recurring scheduling at the moment.

Right now the retry logic is just one retry 5 seconds after the first failure. At which point the hook gets set to a failed status and failure notifications get sent out. Retries are tricky because depending on how the job is implemented they can cause more harm than good. So I plan to refine that more based on customer feedback.

Thank you, good luck to you as well!

I've found that with scheduling tasks for the future it's important to do a final check before fulfilling the action, whether it's sending an email, push notification, etc. You don't want to send a reminder for an event that has been deleted, for example. That is why I have decided to keep the scope small and let developers make the final decision there.

Reports and retries are definitely things that I think add value though, and I have plans to expand on that.

With a recurring job say every minute, the query triggered by the job to send out event reminders would be something like "get me all the events starting in one hour." With Posthook, you are able to start jobs only when needed and the query changes to something like "do I still need to send out a reminder for this event id."

Hello all! I built Posthook as a simple solution for web applications to schedule one-off tasks. It lets you schedule a request back to your application for a certain time, with an optional JSON payload.

It can be an alternative to running your own systems like Sidekiq, Celery, or Quartz and the operational overhead that comes along with them. Cron jobs and cloud provider tools like CloudWatch Events are also used for job scheduling but lack observability and may force you to frequently make expensive queries to your data store just to see if there is any work to do.

Questions and feedback are greatly appreciated :)