rpc_methods did not include rpc_methods

[xlc]

Previous issue: paritytech/substrate#11728

[bkchr]

Please move to: https://github.com/paritytech/json-rpc-interface-spec/

[xlc]

I don't think we need to modify spec https://paritytech.github.io/json-rpc-interface-spec/api/rpc_methods.html
It is the implementation here is wrong.

[bkchr]

I more meant to document that rpc_methods should include rpc_methods as well. The new api is currently implemented one after another.

[bkchr]

CC @lexnv

[lexnv]

Indeed the jsonrpsee exposes the available methods registered (so far).

Substrate calls this method before registering the rpc_methods, because the result must be captured by the closure:

polkadot-sdk/substrate/client/rpc-servers/src/lib.rs

Lines 147 to 156 in bc50052

	let mut available_methods = rpc_api.method_names().collect::<Vec<_>>();
	available_methods.sort();
	rpc_api
	.register_method("rpc_methods", move |_, _| {
	Ok(serde_json::json!({
	"methods": available_methods,
	}))
	})
	.expect("infallible all other methods have their own address space; qed");

Will create a patch for this, thanks for reporting!