The http-server feature no longer has access to Middleware

[ljedrz]

Discovered in https://github.com/AleoHQ/snarkOS/pull/1763, which caused the following errors:

error[E0433]: failed to resolve: could not find `core` in `jsonrpsee`
  --> rpc/src/context.rs:26:5
   |
26 |     core::{middleware::Middleware, Error as JsonrpseeError},
   |     ^^^^ could not find `core` in `jsonrpsee`

error[E0432]: unresolved import `jsonrpsee::core`
  --> rpc/src/context.rs:26:5
   |
26 |     core::{middleware::Middleware, Error as JsonrpseeError},
   |     ^^^^ could not find `core` in `jsonrpsee`

I double-checked it with a dummy crate that has a single dependency:

jsonrpsee = { version = "0.12", features = ["http-server"] }

and it fails to compile with the following import:

use jsonrpsee::core::middleware::Middleware;

While it does work with the server feature instead, I'd expect Middleware to be available for HTTP servers as well.

[niklasad1]

ah shit, you are right https://github.com/paritytech/jsonrpsee/blob/master/jsonrpsee/src/macros.rs#L90

[niklasad1]

Closed by #760