Periodically refreshing an allowlist in njs

[Sergey A. Osokin]

Hi Tom,

hope you're doing well.

On Sat, Mar 26, 2022 at 09:55:48PM +0100, Tom Hall wrote:
> 
> I am looking to replace some lua scripting we have to do an allowlist,
> I found  https://medium.com/geekculture/building-a-simple-bot-protection-with-nginx-javascript-module-njs-and-typescript-386b2207ba90
> and it seems to give me a good idea how to port my lua
> 
> const fs = require('fs');
> const badReputationIPs = loadFile('/var/lib/njs/ips.txt');
> 
> Is there an equivalent in njs? It seems not if you are starting a new
> lightweight VM for every request.
> Is the answer to do a subrequest and cache it or something?

I'd recommend to tweak the architecutre a bit and use a key-value
store instead of an access to a file.

-- 
Sergey A. Osokin