Refactor service to allow building full (and light) node matching chain spec (#1467)

polkadot/cli/src/browser.rs

@@ -46,8 +46,8 @@ async fn start_inner(chain_spec: String, log_level: String) -> Result<Client, Bo
 	info!("👤 Role: {}", config.display_role());
 
 	// Create the service. This is the most heavy initialization step.
-	let (task_manager, rpc_handlers) = service::kusama_new_light(config)
-		.map_err(|e| format!("{:?}", e))?;
+	let builder = service::NodeBuilder::new(config);
+	let (task_manager, rpc_handlers) = builder.build_light().map_err(|e| format!("{:?}", e))?;
 
 	Ok(browser_utils::start_client(task_manager, rpc_handlers))
 }

polkadot/cli/src/command.rs

@@ -106,8 +106,8 @@ pub fn run() -> Result<()> {
 
 	match &cli.subcommand {
 		None => {
-			let runtime = cli.create_runner(&cli.run.base)?;
-			let chain_spec = &runtime.config().chain_spec;
+			let runner = cli.create_runner(&cli.run.base)?;
+			let chain_spec = &runner.config().chain_spec;
 
 			set_default_ss58_version(chain_spec);
 
@@ -124,55 +124,32 @@ pub fn run() -> Result<()> {
 				info!("      endorsed by the       ");
 				info!("     KUSAMA FOUNDATION      ");
 				info!("----------------------------");
-
-				runtime.run_node_until_exit(|config| match config.role {
-					Role::Light => service::kusama_new_light(config)
-						.map(|(components, _)| components),
-					_ => service::kusama_new_full(
-						config,
-						None,
-						None,
-						authority_discovery_disabled,
-						6000,
-						grandpa_pause,
-					).map(|(components, _, _)| components)
-				})
-			} else if chain_spec.is_westend() {
-				runtime.run_node_until_exit(|config| match config.role {
-					Role::Light => service::westend_new_light(config)
-						.map(|(components, _)| components),
-					_ => service::westend_new_full(
-						config,
-						None,
-						None,
-						authority_discovery_disabled,
-						6000,
-						grandpa_pause,
-					).map(|(components, _, _)| components)
-				})
-			} else {
-				runtime.run_node_until_exit(|config| match config.role {
-					Role::Light => service::polkadot_new_light(config)
-						.map(|(components, _)| components),
-					_ => service::polkadot_new_full(
-						config,
-						None,
-						None,
-						authority_discovery_disabled,
-						6000,
-						grandpa_pause,
-					).map(|(components, _, _)| components)
-				})
 			}
+
+			runner.run_node_until_exit(|config| {
+				let role = config.role.clone();
+				let builder = service::NodeBuilder::new(config);
+
+				match role {
+					Role::Light => builder.build_light().map(|(task_manager, _)| task_manager),
+					_ => builder.build_full(
+						None,
+						None,
+						authority_discovery_disabled,
+						6000,
+						grandpa_pause,
+					),
+				}
+			})
 		},
 		Some(Subcommand::Base(subcommand)) => {
-			let runtime = cli.create_runner(subcommand)?;
-			let chain_spec = &runtime.config().chain_spec;
+			let runner = cli.create_runner(subcommand)?;
+			let chain_spec = &runner.config().chain_spec;
 
 			set_default_ss58_version(chain_spec);
 
 			if chain_spec.is_kusama() {
-				runtime.run_subcommand(subcommand, |config|
+				runner.run_subcommand(subcommand, |config|
 					service::new_chain_ops::<
 						service::kusama_runtime::RuntimeApi,
 						service::KusamaExecutor,
@@ -180,7 +157,7 @@ pub fn run() -> Result<()> {
 					>(config)
 				)
 			} else if chain_spec.is_westend() {
-				runtime.run_subcommand(subcommand, |config|
+				runner.run_subcommand(subcommand, |config|
 					service::new_chain_ops::<
 						service::westend_runtime::RuntimeApi,
 						service::WestendExecutor,
@@ -188,7 +165,7 @@ pub fn run() -> Result<()> {
 					>(config)
 				)
 			} else {
-				runtime.run_subcommand(subcommand, |config|
+				runner.run_subcommand(subcommand, |config|
 					service::new_chain_ops::<
 						service::polkadot_runtime::RuntimeApi,
 						service::PolkadotExecutor,
@@ -209,21 +186,21 @@ pub fn run() -> Result<()> {
 			}
 		},
 		Some(Subcommand::Benchmark(cmd)) => {
-			let runtime = cli.create_runner(cmd)?;
-			let chain_spec = &runtime.config().chain_spec;
+			let runner = cli.create_runner(cmd)?;
+			let chain_spec = &runner.config().chain_spec;
 
 			set_default_ss58_version(chain_spec);
 
 			if chain_spec.is_kusama() {
-				runtime.sync_run(|config| {
+				runner.sync_run(|config| {
 					cmd.run::<service::kusama_runtime::Block, service::KusamaExecutor>(config)
 				})
 			} else if chain_spec.is_westend() {
-				runtime.sync_run(|config| {
+				runner.sync_run(|config| {
 					cmd.run::<service::westend_runtime::Block, service::WestendExecutor>(config)
 				})
 			} else {
-				runtime.sync_run(|config| {
+				runner.sync_run(|config| {
 					cmd.run::<service::polkadot_runtime::Block, service::PolkadotExecutor>(config)
 				})
 			}

polkadot/service/src/lib.rs

@@ -793,26 +793,76 @@ pub struct FullNodeHandles {
 	pub validation_service_handle: Option<consensus::ServiceHandle>,
 }
 
-/// Create a new Polkadot service for a light client.
-pub fn polkadot_new_light(config: Configuration) -> Result<
-	(TaskManager, Arc<RpcHandlers>), ServiceError
->
-{
-	new_light::<polkadot_runtime::RuntimeApi, PolkadotExecutor, _>(config)
+/// A builder for a node.
+pub struct NodeBuilder {
+	config: Configuration,
 }
 
-/// Create a new Kusama service for a light client.
-pub fn kusama_new_light(config: Configuration) -> Result<
-	(TaskManager, Arc<RpcHandlers>), ServiceError
->
-{
-	new_light::<kusama_runtime::RuntimeApi, KusamaExecutor, _>(config)
-}
+impl NodeBuilder {
+	/// Create a new node builder.
+	pub fn new(config: Configuration) -> Self {
+		Self {
+			config,
+		}
+	}
 
-/// Create a new Westend service for a light client.
-pub fn westend_new_light(config: Configuration, ) -> Result<
-	(TaskManager, Arc<RpcHandlers>), ServiceError
->
-{
-	new_light::<westend_runtime::RuntimeApi, KusamaExecutor, _>(config)
+	/// Build a new light node.
+	pub fn build_light(self) -> Result<(TaskManager, Arc<RpcHandlers>), ServiceError> {
+		if self.config.chain_spec.is_kusama() {
+			new_light::<kusama_runtime::RuntimeApi, KusamaExecutor, _>(
+				self.config,
+			)
+		} else if self.config.chain_spec.is_westend() {
+			new_light::<westend_runtime::RuntimeApi, WestendExecutor, _>(
+				self.config,
+			)
+		} else {
+			new_light::<polkadot_runtime::RuntimeApi, PolkadotExecutor, _>(
+				self.config,
+			)
+		}
+	}
+
+	/// Build a new full node.
+	#[cfg(feature = "full-node")]
+	pub fn build_full(
+		self,
+		collating_for: Option<(CollatorId, parachain::Id)>,
+		max_block_data_size: Option<u64>,
+		authority_discovery_disabled: bool,
+		slot_duration: u64,
+		grandpa_pause: Option<(u32, u32)>,
+	) -> Result<TaskManager, ServiceError> {
+		if self.config.chain_spec.is_kusama() {
+			new_full::<kusama_runtime::RuntimeApi, KusamaExecutor, _>(
+				self.config,
+				collating_for,
+				max_block_data_size,
+				authority_discovery_disabled,
+				slot_duration,
+				grandpa_pause,
+				false,
+			).map(|(task_manager, _, _, _, _)| task_manager)
+		} else if self.config.chain_spec.is_westend() {
+			new_full::<westend_runtime::RuntimeApi, WestendExecutor, _>(
+				self.config,
+				collating_for,
+				max_block_data_size,
+				authority_discovery_disabled,
+				slot_duration,
+				grandpa_pause,
+				false,
+			).map(|(task_manager, _, _, _, _)| task_manager)
+		} else {
+			new_full::<polkadot_runtime::RuntimeApi, PolkadotExecutor, _>(
+				self.config,
+				collating_for,
+				max_block_data_size,
+				authority_discovery_disabled,
+				slot_duration,
+				grandpa_pause,
+				false,
+			).map(|(task_manager, _, _, _, _)| task_manager)
+		}
+	}
 }