Async access to redis about pistache

[oktal]

Hello Pablo,

First of all, Pistache really does not have anything to do with redis as its job is to serve http requests only.

Now, to answer your question more deeply, yes, it is possible to access a Redis database asynchronously through hiredis. To give you a little more insight on that, I especially implemented the Reactor system with that in mind. I wanted to give users a way to plug their custom asynchronous logic through Pistache's event-loop. For example, let's say that you have a fd that represents a TCP connection to a Redis database and would like to be notified when something happens to that FD (when it becomes readable because a command returned data). You could use the Reactor provided by Pistache to insert your fd in Pistache's event-loop in Polling::Read mode and then install your own Handler to handle events from that FD.

Now, for that to work, I would need to fix issues discovered by #20 (comment)

Let me know if you would be interested in working on that (providing a sample Redis asynchronous API sample use-able through the Pistache's event-loop), as it would be a great example on how to use the Reactor for your own use-cases.