Disable mdns polkadot (#58)

Deactivate mdns for polkadot node as it prevents the process to exit properly

Fixes #57

cumulus/test/parachain/src/cli.rs

@@ -39,6 +39,11 @@ pub struct ExportGenesisStateCommand {
 }
 
 #[derive(Debug, StructOpt, Clone)]
+#[structopt(settings = &[
+	structopt::clap::AppSettings::GlobalVersion,
+	structopt::clap::AppSettings::ArgsNegateSubcommands,
+	structopt::clap::AppSettings::SubcommandsNegateReqs,
+])]
 pub struct Cli {
 	#[structopt(subcommand)]
 	pub subcommand: Option<Subcommand>,

cumulus/test/parachain/src/command.rs

@@ -29,6 +29,7 @@ use sp_runtime::{
 	traits::{Block as BlockT, Hash as HashT, Header as HeaderT},
 	BuildStorage,
 };
+use sc_network::config::TransportConfig;
 use polkadot_service::ChainSpec as ChainSpecPolkadot;
 
 use codec::Encode;
@@ -98,6 +99,7 @@ pub fn run(version: VersionInfo) -> error::Result<()> {
 			polkadot_config.config_dir = config.in_chain_config_dir("polkadot");
 
 			let polkadot_opt: PolkadotCli = sc_cli::from_iter(opt.relaychain_args, &version);
+			let allow_private_ipv4 = !polkadot_opt.run.network_config.no_private_ipv4;
 
 			polkadot_config.rpc_http = Some(DEFAULT_POLKADOT_RPC_HTTP.parse().unwrap());
 			polkadot_config.rpc_ws = Some(DEFAULT_POLKADOT_RPC_WS.parse().unwrap());
@@ -111,6 +113,14 @@ pub fn run(version: VersionInfo) -> error::Result<()> {
 			)?;
 			sc_cli::update_config_for_running_node(&mut polkadot_config, polkadot_opt.run)?;
 
+			// TODO: we disable mdns for the polkadot node because it prevents the process to exit
+			//       properly. See https://github.com/paritytech/cumulus/issues/57
+			polkadot_config.network.transport = TransportConfig::Normal {
+				enable_mdns: false,
+				allow_private_ipv4,
+				wasm_external_transport: None,
+			};
+
 			match config.roles {
 				ServiceRoles::LIGHT => unimplemented!("Light client not supported!"),
 				_ => crate::service::run_collator(config, key, polkadot_config),