Make it possible to override maximum payload of RPC (#9019)

* Make it possible to override maximum payload of RPC

* Finish it.

* remove todo.

* Update client/cli/src/commands/run_cmd.rs

* Apply suggestions from code review

Co-authored-by: David <dvdplm@gmail.com>

* Apply suggestions from code review

Co-authored-by: David <dvdplm@gmail.com>

* Incorporate suggestions

* Thread rpc_max_payload from configuration to trace_block

* Try obey line gitlab/check_line_width.sh

* update state rpc tests

* Improve readbility

* Apply suggestions from code review

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Zeke Mostov <32168567+emostov@users.noreply.github.com>
Co-authored-by: David <dvdplm@gmail.com>

substrate/client/service/src/builder.rs

@@ -804,6 +804,7 @@ fn gen_handler<TBl, TBackend, TExPool, TRpc, TCl>(
 			client.clone(),
 			subscriptions.clone(),
 			deny_unsafe,
+			config.rpc_max_payload,
 		);
 		(chain, state, child_state)
 	};

substrate/client/service/src/config.rs

@@ -95,6 +95,8 @@ pub struct Configuration {
 	pub rpc_cors: Option<Vec<String>>,
 	/// RPC methods to expose (by default only a safe subset or all of them).
 	pub rpc_methods: RpcMethods,
+	/// Maximum payload of rpc request/responses.
+	pub rpc_max_payload: Option<usize>,
 	/// Prometheus endpoint configuration. `None` if disabled.
 	pub prometheus_config: Option<PrometheusConfig>,
 	/// Telemetry service URL. `None` if disabled.

substrate/client/service/src/lib.rs

@@ -387,6 +387,7 @@ fn start_rpc_servers<
 					deny_unsafe(&address, &config.rpc_methods),
 					sc_rpc_server::RpcMiddleware::new(rpc_metrics.clone(), "http")
 				),
+				config.rpc_max_payload
 			),
 		)?.map(|s| waiting::HttpServer(Some(s))),
 		maybe_start_server(
@@ -399,6 +400,7 @@ fn start_rpc_servers<
 					deny_unsafe(&address, &config.rpc_methods),
 					sc_rpc_server::RpcMiddleware::new(rpc_metrics.clone(), "ws")
 				),
+				config.rpc_max_payload
 			),
 		)?.map(|s| waiting::WsServer(Some(s))),
 	)))