How to send a job in the backend and refresh status in web app ?

[Luc Larochelle]

Hi,

I've researched this subject and read a lot, but can't come to a conclusion. I need help to get things straight ... 

In my web app, I simply manage elements in a DB with API endpoints. So far, this is awesome. My setup is Mojolicious + AngularJS + Bootstrap.

The way I see this, my question has 2 approaches :

1) When I add a new element in the table, I'd like to deploy a job, where a backend scripts connects to the element and reports a status to the web app.

2) Some daemon is periodically watching an "inventory" API endpoint and when a new element is detected, the backend script connects to the element and reports a status to the web app.

For instance, it could set a status light for connectivity and authentication success on each line of my table.

In any ways, I thought websockets + minions would be my friends, but the more I read about it, the more I get confused. Are Minions suited for this task ?

How should I achieve this ? 

[Luc Larochelle]

It was implied that the status update would/could be async. 

Luc

[Dan Book]

Pubsub over a db like Pg or Redis might be useful if you are using one of those. Otherwise the Mercury websocket broker can also act as a pubsub daemon.

-Dan

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[Luc Larochelle]

I'm using Mojo::SQLite to address BD needs. The Mercury websocket broker seems an accurate choice, though. 

On Thursday, 9 May 2019 17:21:35 UTC-4, Dan Book wrote:

Pubsub over a db like Pg or Redis might be useful if you are using one of those. Otherwise the Mercury websocket broker can also act as a pubsub daemon.

-Dan

On Thu, May 9, 2019 at 4:17 PM Luc Larochelle <llaro...@gmail.com> wrote:

Hi,

I've researched this subject and read a lot, but can't come to a conclusion. I need help to get things straight ... 

In my web app, I simply manage elements in a DB with API endpoints. So far, this is awesome. My setup is Mojolicious + AngularJS + Bootstrap.

The way I see this, my question has 2 approaches :

1) When I add a new element in the table, I'd like to deploy a job, where a backend scripts connects to the element and reports a status to the web app.

2) Some daemon is periodically watching an "inventory" API endpoint and when a new element is detected, the backend script connects to the element and reports a status to the web app.

For instance, it could set a status light for connectivity and authentication success on each line of my table.

In any ways, I thought websockets + minions would be my friends, but the more I read about it, the more I get confused. Are Minions suited for this task ?

How should I achieve this ? 

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[Luc Larochelle]

I need to restart this debate :)

I've been looking into this and found the Multiplex plugin for Mojolicious by Joel Berger. Seems interesting too, but I still need to understand the mechanics of websockets and non-blocking IO and minion jobs ... That's a lot 

So I thought of something else ... What if my webage would automatically refresh every X seconds and after sending a job in the background, the BD would be updated with the job results so that when the api endpoint is read by the client, the data is refreshed ? I feel lazy proposing it, but the other way around sounds like a nightmare (I'm not a developper)

What do you think ?