Add basic, not-useful websocket server

beacon_node/client/src/config.rs

@@ -27,6 +27,7 @@ pub struct Config {
     pub network: network::NetworkConfig,
     pub rpc: rpc::RPCConfig,
     pub rest_api: rest_api::ApiConfig,
+    pub websocket_server: websocket_server::Config,
 }
 
 /// Defines how the client should initialize a BeaconChain.
@@ -96,6 +97,7 @@ impl Default for Config {
             network: NetworkConfig::new(),
             rpc: <_>::default(),
             rest_api: <_>::default(),
+            websocket_server: <_>::default(),
             spec_constants: TESTNET_SPEC_CONSTANTS.into(),
             beacon_chain_start_method: <_>::default(),
             eth1_backend_method: <_>::default(),

beacon_node/client/src/lib.rs

@@ -229,6 +229,11 @@ where
             None
         };
 
+        // Start the websocket server
+        let _websocket_sender = if client_config.websocket_server.enabled {
+            websocket_server::start_server::<T::EthSpec>(&client_config.websocket_server, &log)?;
+        };
+
         let (slot_timer_exit_signal, exit) = exit_future::signal();
         if let Some(duration_to_next_slot) = beacon_chain.slot_clock.duration_to_next_slot() {
             // set up the validator work interval - start at next slot and proceed every slot