feat: .get(<array of CIDs>)

[daviddias]

We need an endpoint for https://github.com/ipfs/js-ipfs-unixfs-engine that can return multiple IPLD nodes from an Array of CIDs.

Leverage ipfs/js-ipfs-block-service#81

This is blocking ipfs/js-ipfs#856.

@vmx do you already have code for this with the GraphSync endeavour?

[vmx]

I think it would make sense to put this into Bitswap. Though I'm not sure if that will be easy (the way Bitswap works today). I don't have usable code for this.

[daviddias]

This already exists on Bitswap. We need it here to trickle it down. This is needed for ipfs/js-ipfs#856 and should be quick to implement

I made a graph to explain today's architecture ipfs/js-ipfs#1673 it should help understand how the ask for the multiple CIDs gets trickled.

[daviddias]

@vmx this is labeled as P0 Critical since Jun 4, it should be a simple change. Do you disagree with the priority? Feel free to adjust the label.

[vmx]

@diasdavid This slipped my attention, I'll have a look. thanks for pinging.

[daviddias]

@vmx develop the habit at checking the waffle board and use filters to help you understand what is top priority (and also to communicate to others). https://waffle.io/ipld/js-ipld

https://waffle.io/ipld/js-ipld?label=P0%20-%20Critical

https://waffle.io/ipld/js-ipld?label=P1%20-%20High