Macros error

[Pierre-Green]

Hello,
I've started to use jsonrpsee recently. I've created a common cargo crate in my workspace with my Rpc traits and this crate is used in a leptos wasm app and in a tokio backend.
I've tried to write a macro_rules! to conditionally include the RpcServer in the decorator macro as follow:

use jsonrpsee::proc_macros::rpc;
use jsonrpsee_types::error::ErrorObjectOwned;

macro_rules! rpc_trait {
    ($visibility:vis trait $name:ident {$($body:tt)*}) =>
    {
        #[cfg(not(feature = "server"))]
        mod trait_definition {
            use super::*;

            #[rpc(client)]
            #[async_trait]
            $visibility trait $name {
                $($body)*
            }
        }

        #[cfg(feature = "server")]
        mod trait_definition {
            use super::*;

            #[rpc(server, client)]
            #[async_trait]
            $visibility trait $name {
                $($body)*
            }
        }

        pub use trait_definition::*;
    };
}

rpc_trait! {
    pub trait BrainRpc {
        #[method(name = "getStatus")]
        async fn get_status(&self) -> Result<(), ErrorObjectOwned>;
    }
}

but I have the following error:

error[E0425]: cannot find value `__self` in this scope
  --> shared/brain-rpc/src/lib.rs:22:13
   |
22 |               #[rpc(server, client)]
   |               ^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
...
33 | / rpc_trait! {
34 | |     pub trait BrainRpc {
35 | |         #[method(name = "getStatus")]
36 | |         async fn get_status(&self) -> Result<(), ErrorObjectOwned>;
37 | |     }
38 | | }
   | |_- in this macro invocation
   |
   = note: this error originates in the attribute macro `rpc` which comes from the expansion of the macro `rpc_trait` (in Nightly builds, run with -Z macro-backtrace for more info)

Does someone have any idea of a way to fix it ?

[niklasad1]

You could just do:

#[cfg_attr(feature = "server", rpc(client, server))]
#[cfg_attr(not(feature = "server"), rpc(client))]
pub trait BrainRpc {
	#[method(name = "getStatus")]
	async fn get_status(&self) -> Result<(), ErrorObjectOwned>;
}

I think the #[async_trait] stuff on the jsonrpsee rpc trait needs to be elided but looks like "let__self = self" doesn't work with your added module.