make the ws buffer size configurable (#10013)

* make the ws buffer size configurable

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

Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

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

Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

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

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Final touches

* Apply suggestions from code review

* fix bench

* remove in buffer

* Apply suggestions from code review

Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/client/service/src/config.rs

@@ -97,6 +97,8 @@ pub struct Configuration {
 	pub rpc_methods: RpcMethods,
 	/// Maximum payload of rpc request/responses.
 	pub rpc_max_payload: Option<usize>,
+	/// Maximum size of the output buffer capacity for websocket connections.
+	pub ws_max_out_buffer_capacity: 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

@@ -424,6 +424,7 @@ fn start_rpc_servers<
 					),
 				)?,
 				config.rpc_max_payload,
+				config.ws_max_out_buffer_capacity,
 				server_metrics.clone(),
 				config.tokio_handle.clone(),
 			)