Embedd rpc spec in rpc api

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

src/rpc.rs

@@ -22,6 +22,9 @@ use crate::{
     time::current_timestamp,
 };
 
+/// The OpenRPC specification for the HeroCoordinator JSON-RPC API
+const OPENRPC_SPEC: &str = include_str!("../specs/openrpc.json");
+
 pub struct AppState {
     pub service: AppService,
 }
@@ -638,6 +641,15 @@ pub fn build_module(state: Arc<AppState>) -> RpcModule<()> {
             })
             .expect("register message.load");
     }
+    {
+        module
+            .register_async_method("rpc.discover", move |_params, _caller, _ctx| async move {
+                let spec = serde_json::from_str::<serde_json::Value>(OPENRPC_SPEC)
+                    .expect("Failed to parse OpenRPC spec");
+                Ok::<_, ErrorObjectOwned>(spec)
+            })
+            .expect("register rpc.discover");
+    }
 
     module
 }