Proof of concept: Synchronous ds <-> dstopic IPC

One big challenge for the ds/dstopic divide is this idea that there will be a single, long-lived dstopic binary that ds will then communicate with to request data be warmed up. But this comes with a tricky bit: There’s no easy way to do synchronous IPC in Node, and require is a synchronous operation.

So here’s a challenge: We need at -least- a proof of concept of how to send requests from ds to dstopic synchronously. This includes a way to wait for dstopic to be done with its task and send a success response back before the call is over.

Hint: one way to possibly do this is by using fs.writeSync/fs.readSync with a local socket of some sort. I forget the details, but that’s the first avenue I’d explore to accomplish this.

([original thread](https://discourse.entropic.dev/t/looking-for-help-synchronous-ipc-in-node/219))