Default value for ChainType, when not in grin.toml

core/src/global.rs

@@ -64,6 +64,12 @@ pub enum ChainTypes {
 	Mainnet,
 }
 
+impl Default for ChainTypes {
+	fn default() -> ChainTypes {
+		ChainTypes::UserTesting
+	}
+}
+
 lazy_static!{
 	/// The mining parameter mode
 	pub static ref CHAIN_TYPE: RwLock<ChainTypes> =

grin/src/server.rs

@@ -91,7 +91,7 @@ impl Server {
 
 		let mut genesis_block = None;
 		if !chain::Chain::chain_exists(config.db_root.clone()) {
-      let chain_type = config.chain_type.clone().unwrap();
+      let chain_type = config.chain_type.clone();
       if chain_type == global::ChainTypes::Testnet1 {
         genesis_block = Some(genesis::genesis_testnet1());
       } else {

grin/src/types.rs

@@ -92,7 +92,8 @@ pub struct ServerConfig {
 	pub api_http_addr: String,
 
 	/// Setup the server for tests, testnet or mainnet
-	pub chain_type: Option<ChainTypes>,
+	#[serde(default)]
+	pub chain_type: ChainTypes,
 
 	/// Method used to get the list of seed nodes for initial bootstrap.
 	pub seeding_type: Seeding,
@@ -125,7 +126,7 @@ impl Default for ServerConfig {
 			seeds: None,
 			p2p_config: Some(p2p::P2PConfig::default()),
 			mining_config: Some(pow::types::MinerConfig::default()),
-			chain_type: Some(ChainTypes::Testnet1),
+			chain_type: ChainTypes::default(),
 			pool_config: pool::PoolConfig::default(),
 		}
 	}

src/bin/grin.rs

@@ -57,8 +57,7 @@ fn start_from_config_file(mut global_config: GlobalConfig) {
 			.unwrap()
 			.server
 			.clone()
-			.chain_type
-			.unwrap(),
+			.chain_type,
 	);
 
 	grin::Server::start(global_config.members.as_mut().unwrap().server.clone()).unwrap();
@@ -102,8 +101,7 @@ fn main() {
 				.unwrap()
 				.server
 				.clone()
-				.chain_type
-				.unwrap(),
+				.chain_type,
 		);
 	} else {
 		init_logger(Some(LoggingConfig::default()));