Add basic support for getmininginfo RPC call

[mpguerra]

Motivation

We want to support the RPCs used by mining pools.

https://zcash.github.io/rpc/getmininginfo.html

Tasks

s-nomp uses the networkhashps field for statistics:

• https://github.com/s-nomp/node-stratum-pool/blob/d86ae73f8ff968d9355bb61aac05e0ebef36ccb5/lib/pool.js#L452

This might need a new state request to calculate the network hash rate from recent blocks.

Other mining pools have told us they use the chain field to detect mainnet or testnet.

We can skip the other fields for now.

Related Work

We should probably do this at the same time as:

• Implement getnetworksolps and getnetworkhashps RPC #5721

[mpguerra]

Hey team! Please add your planning poker estimate with Zenhub @arya2 @conradoplg @dconnolly @oxarbitrage @teor2345

[teor2345]

I'd like to know what fields we're implementing first, before I estimate this RPC.

[mpguerra]

I'd like to know what fields we're implementing first, before I estimate this RPC.

Looking at this again I've decided to remove from the sprint until I can do some more research on it. FWIW I think we'd start with just the fields that we know are used by mining pools, e.g the network hash rate

[teor2345]

@mpguerra I've updated the ticket with the two fields we know are currently used by mining pools

[mpguerra]

@mpguerra I've updated the ticket with the two fields we know are currently used by mining pools

Are you able to estimate this now based on the above 2 fields?