parachain-template: Simplify it

cumulus/client/consensus/aura/src/collators/basic.rs

@@ -42,7 +42,7 @@ use sp_api::{CallApiAt, ProvideRuntimeApi};
 use sp_application_crypto::AppPublic;
 use sp_blockchain::HeaderBackend;
 use sp_consensus::SyncOracle;
-use sp_consensus_aura::{AuraApi, SlotDuration};
+use sp_consensus_aura::AuraApi;
 use sp_core::crypto::Pair;
 use sp_inherents::CreateInherentDataProviders;
 use sp_keystore::KeystorePtr;
@@ -74,8 +74,6 @@ pub struct Params<BI, CIDP, Client, RClient, SO, Proposer, CS> {
 	pub para_id: ParaId,
 	/// A handle to the relay-chain client's "Overseer" or task orchestrator.
 	pub overseer_handle: OverseerHandle,
-	/// The length of slots in this chain.
-	pub slot_duration: SlotDuration,
 	/// The length of slots in the relay chain.
 	pub relay_chain_slot_duration: Duration,
 	/// The underlying block proposer this should call into.
@@ -197,11 +195,16 @@ where
 					Ok(Some(h)) => h,
 				};
 
+			let slot_duration = match params.para_client.runtime_api().slot_duration(parent_hash) {
+				Ok(d) => d,
+				Err(e) => reject_with_error!(e),
+			};
+
 			let claim = match collator_util::claim_slot::<_, _, P>(
 				&*params.para_client,
 				parent_hash,
 				&relay_parent_header,
-				params.slot_duration,
+				slot_duration,
 				params.relay_chain_slot_duration,
 				&params.keystore,
 			)

cumulus/client/consensus/aura/src/equivocation_import_queue.rs

@@ -70,7 +70,6 @@ impl NaiveEquivocationDefender {
 struct Verifier<P, Client, Block, CIDP> {
 	client: Arc<Client>,
 	create_inherent_data_providers: CIDP,
-	slot_duration: SlotDuration,
 	defender: NaiveEquivocationDefender,
 	telemetry: Option<TelemetryHandle>,
 	_phantom: std::marker::PhantomData<fn() -> (Block, P)>,
@@ -110,7 +109,13 @@ where
 				format!("Could not fetch authorities at {:?}: {}", parent_hash, e)
 			})?;
 
-			let slot_now = slot_now(self.slot_duration);
+			let slot_duration = self
+				.client
+				.runtime_api()
+				.slot_duration(parent_hash)
+				.map_err(|e| e.to_string())?;
+
+			let slot_now = slot_now(slot_duration);
 			let res = aura_internal::check_header_slot_and_seal::<Block, P>(
 				slot_now,
 				block_params.header,
@@ -218,7 +223,6 @@ pub fn fully_verifying_import_queue<P, Client, Block: BlockT, I, CIDP>(
 	client: Arc<Client>,
 	block_import: I,
 	create_inherent_data_providers: CIDP,
-	slot_duration: SlotDuration,
 	spawner: &impl sp_core::traits::SpawnEssentialNamed,
 	registry: Option<&substrate_prometheus_endpoint::Registry>,
 	telemetry: Option<TelemetryHandle>,
@@ -240,7 +244,6 @@ where
 		client,
 		create_inherent_data_providers,
 		defender: NaiveEquivocationDefender::default(),
-		slot_duration,
 		telemetry,
 		_phantom: std::marker::PhantomData,
 	};

cumulus/polkadot-parachain/src/service.rs

@@ -718,8 +718,6 @@ pub async fn start_generic_aura_node<Net: NetworkBackend<Block, Hash>>(
 		 overseer_handle,
 		 announce_block,
 		 _backend| {
-			let slot_duration = cumulus_client_consensus_aura::slot_duration(&*client)?;
-
 			let proposer_factory = sc_basic_authorship::ProposerFactory::with_proof_recording(
 				task_manager.spawn_handle(),
 				client.clone(),
@@ -746,7 +744,6 @@ pub async fn start_generic_aura_node<Net: NetworkBackend<Block, Hash>>(
 				collator_key,
 				para_id,
 				overseer_handle,
-				slot_duration,
 				relay_chain_slot_duration,
 				proposer,
 				collator_service,
@@ -892,15 +889,6 @@ where
 					}
 				}
 
-				// Move to Aura consensus.
-				let slot_duration = match cumulus_client_consensus_aura::slot_duration(&*client) {
-					Ok(d) => d,
-					Err(e) => {
-						log::error!("Could not get Aura slot duration: {e}");
-						return
-					},
-				};
-
 				let proposer = Proposer::new(proposer_factory);
 
 				let params = BasicAuraParams {
@@ -913,7 +901,6 @@ where
 					collator_key,
 					para_id,
 					overseer_handle,
-					slot_duration,
 					relay_chain_slot_duration,
 					proposer,
 					collator_service,

prdoc/pr_3801.prdoc

@@ -0,0 +1,10 @@
+title: "Remove `slot_duration` from `aura::collators::basic::Params`"
+
+doc:
+  - audience: Node Dev
+    description: |
+      Removes the `slot_duration` parameter from the `aura::collators::basic::Params`.
+      The `slot_duration` will now be fetched from the runtime using the `Aura` runtime api.
+
+crates:
+  - name: cumulus-client-consensus-aura

templates/parachain/node/src/command.rs

@@ -10,7 +10,6 @@ use sc_cli::{
 	NetworkParams, Result, SharedParams, SubstrateCli,
 };
 use sc_service::config::{BasePath, PrometheusConfig};
-use sp_runtime::traits::AccountIdConversion;
 
 use crate::{
 	chain_spec,
@@ -241,17 +240,11 @@ pub fn run() -> Result<()> {
 
 				let id = ParaId::from(para_id);
 
-				let parachain_account =
-					AccountIdConversion::<polkadot_primitives::AccountId>::into_account_truncating(
-						&id,
-					);
-
 				let tokio_handle = config.tokio_handle.clone();
 				let polkadot_config =
 					SubstrateCli::create_configuration(&polkadot_cli, &polkadot_cli, tokio_handle)
 						.map_err(|err| format!("Relay chain argument error: {}", err))?;
 
-				info!("Parachain Account: {parachain_account}");
 				info!("Is collating: {}", if config.role.is_authority() { "yes" } else { "no" });
 
 				crate::service::start_parachain_node(