Being able to feed decisions to the script via stdin

[buixor]

Problem

Currently, each decision being fed to the custom-bouncer leads to an execution of the script. With the ever-growing (yay) list of decisions in the community-blocklist, it is (and will) become an issue. We need to have something that scales best.

cf. https://discourse.crowdsec.net/t/custom-bouncer-firewalld-questions/565

Solution

Allowing the user script to be fed via stdin seems to be a good alternative. Named pipe or such might be too, but would add unnecessary complexity ?
Allowing configurable batching parameters at the bouncer level (frequency and/or number of items)

Question / Things to deal with

• Configurable batch windows size/time
• Configurable behavior on child process crash (restart/die)