feat: RpcModule::from_arc

[aatifsyed]

I want to share state between my RpcModule and another service.
Because RpcModule only Derefs to Context, I have to have a second Arc, and my handlers have to accept Arc<Arc<Context>>.

This would allow me to clone the inner context, obviating the need for the double indirection.

Alternative approaches:

• impl Deref<Target = Arc<Context>>. I think this is backwards-compatible.
• RpcModule::new(_: impl Into<Arc<Context>>), which is backwards-compatible.
  I could clone the arc before passing it to the ctor, where it would stay without a new Arc

[niklasad1]

hmm I may be slow but I suppose you want to something like:

let shared_state = shared_state();
let rpc1 = RpcModule::new(shared_state);
let shared_state = rpc1.context().clone();
let rpc2 = RpcModule::new(shared_state);

If that's the case I would prefer to add another API RpcModule::from_arc instead

let shared_state = Arc::new(shared_state());
let rpc1 = RpcModule::from_arc(shared_state.clone());
let rpc2 = RpcModule::from_arc(shared_state);

[aatifsyed]

I've implemented your suggestion :)

[niklasad1]

Thanks, looks good to me