public InetSocketAddress socketAddress() {
    if (httpServer == null) {
      return EMPTY_SOCKET_ADDRESS;
    }
    return new InetSocketAddress(config.getHost(), httpServer.actualPort());
  }
Construct a EngineJsonRpcService to handle either http or websocket clients

@param vertx The vertx process that will be running this service
@param dataDir The data directory where requests can be buffered
@param config Configuration for the rpc methods being loaded
@param metricsSystem The metrics service that activities should be reported to
@param natService The NAT environment manager.
@param methods The json rpc methods that should be enabled
@param maybeSockets websocket configuration to use
@param scheduler for managing ETH tasks
@param authenticationService used to grant or deny access to methods served
@param livenessService A service responsible for reporting whether this node is live
@param readinessService A service responsible for reporting whether this node has fully started
ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/EngineJsonRpcService.java