remove: ETCM-12417 sidechain-slots crate and its usages

Cargo.toml

@@ -31,7 +31,6 @@ members = [
 	"toolkit/sidechain/sidechain-mc-hash",
 	"toolkit/sidechain/pallet",
 	"toolkit/sidechain/rpc",
-	"toolkit/sidechain/sidechain-slots",
 	"toolkit/sidechain/primitives",
 	"toolkit/committee-selection/primitives",
 	"toolkit/committee-selection/query",
@@ -286,7 +285,6 @@ pallet-address-associations = { path = "toolkit/address-associations/pallet", de
 
 # sidechain core
 sidechain-domain = { path = "toolkit/sidechain/domain", default-features = false }
-sidechain-slots = { path = "toolkit/sidechain/sidechain-slots", default-features = false }
 sidechain-mc-hash = { path = "toolkit/sidechain/sidechain-mc-hash", default-features = false }
 sp-sidechain = { path = "toolkit/sidechain/primitives", default-features = false }
 pallet-sidechain = { path = "toolkit/sidechain/pallet", default-features = false }

changelog.md

@@ -62,6 +62,10 @@ Existing chains must add the `LegacyToV1Migration` migration to their runtime be
 * `sidechain-block-search` crate has been removed. All logic used by `sp-session-validator-management-query` has been
 moved to that crate directly.
 * `ScSlotNumber` type has been removed from `sidechain_domain` crate as its been obsolete after other changes
+* `sidechain-slots` crate bas been removed after all other components have been decoupled from the notion of slots.
+Legacy chains whose nodes used the `SlotApi` runtime API and the `sidechain_slots::runtime_api_client::slot_config`
+function to read slot duration from the runtime should instead use their respective consensus algorithm's runtime API
+(eg. `AuraApi` and `BabeApi`) or local environment.
 
 ## Fixed
 

demo/node/Cargo.toml

@@ -53,7 +53,6 @@ authority-selection-inherents = { workspace = true }
 frame-system = { workspace = true }
 pallet-transaction-payment = { workspace = true }
 sidechain-domain = { workspace = true }
-sidechain-slots = { workspace = true, features = ["std", "serde"] }
 sp-sidechain = { workspace = true }
 pallet-sidechain-rpc = { workspace = true, features = ["legacy-slotapi-compat"] }
 pallet-session-validator-management = { workspace = true }

demo/node/src/chain_spec.rs

@@ -5,7 +5,6 @@ use partner_chains_demo_runtime::{
 };
 use sc_service::ChainType;
 use sidechain_domain::ScEpochDuration;
-use sidechain_slots::SlotsPerEpoch;
 use sp_core::{Pair, Public};
 use sp_runtime::traits::{IdentifyAccount, Verify};
 
@@ -37,6 +36,8 @@ pub fn runtime_wasm() -> &'static [u8] {
 	WASM_BINARY.expect("Runtime wasm not available")
 }
 
+pub const DEFAULT_SLOTS_PER_EPOCH: u64 = 60;
+
 /// Creates chain-spec according to the config obtained by wizards.
 /// [serde_json::Value] is returned instead of [sc_service::GenericChainSpec] in order to avoid
 /// GPL code in the toolkit.
@@ -63,7 +64,7 @@ pub fn pc_create_chain_spec(config: &CreateChainSpecConfig<SessionKeys>) -> serd
 			non_authority_keys: vec![],
 		},
 		sidechain: config.pallet_sidechain_config(ScEpochDuration::from_millis(
-			SLOT_DURATION * u64::from(SlotsPerEpoch::default().0),
+			SLOT_DURATION * DEFAULT_SLOTS_PER_EPOCH,
 		)),
 		session_committee_management: config.pallet_session_validator_management_config(),
 		governed_map: config.governed_map_config(),
@@ -86,3 +87,10 @@ pub fn pc_create_chain_spec(config: &CreateChainSpecConfig<SessionKeys>) -> serd
 	let chain_spec_str = chain_spec.as_json(raw).expect("Chain spec serialization can not fail");
 	serde_json::from_str(&chain_spec_str).unwrap()
 }
+
+pub(crate) fn read_slots_per_epoch_from_env() -> u64 {
+	std::env::var("SLOTS_PER_EPOCH")
+		.ok()
+		.and_then(|s| s.parse().ok())
+		.unwrap_or(DEFAULT_SLOTS_PER_EPOCH)
+}

demo/node/src/inherent_data.rs

@@ -13,7 +13,6 @@ use sidechain_domain::{
 	DelegatorKey, McBlockHash, ScEpochNumber, mainchain_epoch::MainchainEpochConfig,
 };
 use sidechain_mc_hash::{McHashDataSource, McHashInherentDataProvider as McHashIDP};
-use sidechain_slots::ScSlotConfig;
 use sp_api::ProvideRuntimeApi;
 use sp_block_participation::{
 	BlockParticipationApi,
@@ -81,16 +80,14 @@ where
 			governed_map_data_source,
 			bridge_data_source,
 		} = self;
-		let CreateInherentDataConfig { mc_epoch_config, sc_slot_config, time_source } = config;
+		let CreateInherentDataConfig { mc_epoch_config, slot_duration, time_source, .. } = config;
 
-		let (slot, timestamp) =
-			timestamp_and_slot_cidp(sc_slot_config.slot_duration, time_source.clone());
+		let (slot, timestamp) = timestamp_and_slot_cidp(*slot_duration, time_source.clone());
 		let parent_header = client.expect_header(parent_hash)?;
 
 		// note: We pass slot start time to `McHashIDP` instead of timestamp for backward compatibility
 		// with the old `McHashIDP` version that was slot-based.
-		let slot_start_timestamp =
-			Timestamp::new(sc_slot_config.slot_start_time(*slot).unix_millis());
+		let slot_start_timestamp = config.slot_start_time(*slot);
 		let mc_hash = McHashIDP::new_proposal(
 			parent_header,
 			mc_hash_data_source.as_ref(),
@@ -100,7 +97,7 @@ where
 
 		let ariadne_data_provider = AriadneIDP::new(
 			client.as_ref(),
-			sc_slot_config.epoch_duration().as_millis() as u64,
+			config.sc_epoch_duration_millis,
 			mc_epoch_config,
 			parent_hash,
 			(*timestamp).as_millis(),
@@ -152,7 +149,7 @@ pub struct VerifierCIDP<T> {
 
 impl<T: Send + Sync> CurrentSlotProvider for VerifierCIDP<T> {
 	fn slot(&self) -> Slot {
-		*timestamp_and_slot_cidp(self.config.slot_duration(), self.config.time_source.clone()).0
+		*timestamp_and_slot_cidp(self.config.slot_duration, self.config.time_source.clone()).0
 	}
 }
 
@@ -187,19 +184,16 @@ where
 			governed_map_data_source,
 			bridge_data_source,
 		} = self;
-		let CreateInherentDataConfig { mc_epoch_config, sc_slot_config, .. } = config;
+		let CreateInherentDataConfig { mc_epoch_config, .. } = config;
 
 		// note: Because it's not exposed during block verification, we are approximating the block
 		// timestamp by the starting timestamp of the slots. This is also needed for backward compatibility
 		// of [McHashIDP] for chains that used the old slot-based version of it.
-		let timestamp = TimestampIDP::new(Timestamp::new(
-			sc_slot_config.slot_start_time(verified_block_slot).unix_millis(),
-		));
+		let timestamp = TimestampIDP::new(config.slot_start_time(verified_block_slot));
 
 		let parent_header = client.expect_header(parent_hash)?;
 		let parent_slot = slot_from_predigest(&parent_header)?;
-		let parent_slot_timestamp = parent_slot
-			.map(|slot| Timestamp::new(sc_slot_config.slot_start_time(slot).unix_millis()));
+		let parent_slot_timestamp = parent_slot.map(|slot| config.slot_start_time(slot));
 
 		let mc_state_reference = McHashIDP::new_verification(
 			parent_header,
@@ -212,7 +206,7 @@ where
 
 		let ariadne_data_provider = AriadneIDP::new(
 			client.as_ref(),
-			sc_slot_config.epoch_duration().as_millis() as u64,
+			config.sc_epoch_duration_millis,
 			mc_epoch_config,
 			parent_hash,
 			(*timestamp).as_millis(),
@@ -263,16 +257,16 @@ pub fn slot_from_predigest(
 }
 
 #[derive(new, Clone)]
-pub(crate) struct CreateInherentDataConfig {
+pub struct CreateInherentDataConfig {
 	pub mc_epoch_config: MainchainEpochConfig,
-	// TODO ETCM-4079 make sure that this struct can be instantiated only if sidechain epoch duration is divisible by slot_duration
-	pub sc_slot_config: ScSlotConfig,
+	pub slot_duration: SlotDuration,
+	pub sc_epoch_duration_millis: u64,
 	pub time_source: Arc<dyn TimeSource + Send + Sync>,
 }
 
 impl CreateInherentDataConfig {
-	pub fn slot_duration(&self) -> SlotDuration {
-		self.sc_slot_config.slot_duration
+	pub fn slot_start_time(&self, slot: Slot) -> Timestamp {
+		Timestamp::new(self.slot_duration.as_millis() * u64::from(slot))
 	}
 }
 

demo/node/src/rpc.rs

@@ -74,7 +74,6 @@ where
 	C::Api: pallet_transaction_payment_rpc::TransactionPaymentRuntimeApi<Block, Balance>,
 	C::Api: BlockBuilder<Block>,
 	C::Api: sp_consensus_aura::AuraApi<Block, sp_consensus_aura::sr25519::AuthorityId>,
-	C::Api: sidechain_slots::SlotApi<Block>,
 	C::Api: sp_sidechain::GetGenesisUtxo<Block>,
 	C::Api: sp_sidechain::GetSidechainStatus<Block>,
 	C::Api: sp_block_producer_fees::BlockProducerFeesApi<Block, AccountId>,

demo/node/src/service.rs

@@ -16,9 +16,13 @@ use sc_telemetry::{Telemetry, TelemetryWorker};
 use sc_transaction_pool_api::OffchainTransactionPoolFactory;
 use sidechain_domain::mainchain_epoch::MainchainEpochConfig;
 use sidechain_mc_hash::McHashInherentDigest;
+use sp_api::ProvideRuntimeApi;
+use sp_blockchain::HeaderBackend;
+use sp_consensus_aura::AuraApi;
 use sp_consensus_aura::sr25519::AuthorityPair as AuraPair;
 use sp_partner_chains_consensus_aura::block_proposal::PartnerChainsProposerFactory;
 use sp_runtime::traits::Block as BlockT;
+use sp_sidechain::GetEpochDurationApi;
 use std::{sync::Arc, time::Duration};
 use time_source::SystemTimeSource;
 use tokio::task;
@@ -76,6 +80,7 @@ pub fn new_partial(
 			Option<Telemetry>,
 			DataSources,
 			Option<McFollowerMetrics>,
+			CreateInherentDataConfig,
 		),
 	>,
 	ServiceError,
@@ -134,13 +139,24 @@ pub fn new_partial(
 		telemetry.as_ref().map(|x| x.handle()),
 	)?;
 
-	let sc_slot_config = sidechain_slots::runtime_api_client::slot_config(&*client)
-		.map_err(sp_blockchain::Error::from)?;
+	let slot_duration = client
+		.runtime_api()
+		.slot_duration(client.info().best_hash)
+		.expect("Aura slot duration must be configured in the runtime");
+	let sc_epoch_duration_millis = client
+		.runtime_api()
+		.get_epoch_duration_millis(client.info().best_hash)
+		.expect("Epoch duration must be configured in the runtime");
 
 	let time_source = Arc::new(SystemTimeSource);
 	let epoch_config = MainchainEpochConfig::read_from_env()
 		.map_err(|err| ServiceError::Application(err.into()))?;
-	let inherent_config = CreateInherentDataConfig::new(epoch_config, sc_slot_config, time_source);
+	let inherent_config = CreateInherentDataConfig::new(
+		epoch_config,
+		slot_duration,
+		sc_epoch_duration_millis,
+		time_source,
+	);
 
 	let import_queue = partner_chains_aura_import_queue::import_queue::<
 		AuraPair,
@@ -155,7 +171,7 @@ pub fn new_partial(
 		justification_import: Some(Box::new(grandpa_block_import.clone())),
 		client: client.clone(),
 		create_inherent_data_providers: VerifierCIDP::new(
-			inherent_config,
+			inherent_config.clone(),
 			client.clone(),
 			data_sources.mc_hash.clone(),
 			data_sources.authority_selection.clone(),
@@ -178,7 +194,14 @@ pub fn new_partial(
 		keystore_container,
 		select_chain,
 		transaction_pool,
-		other: (grandpa_block_import, grandpa_link, telemetry, data_sources, mc_follower_metrics),
+		other: (
+			grandpa_block_import,
+			grandpa_link,
+			telemetry,
+			data_sources,
+			mc_follower_metrics,
+			inherent_config,
+		),
 	})
 }
 
@@ -210,7 +233,7 @@ pub async fn new_full_base<Network: sc_network::NetworkBackend<Block, <Block as
 		keystore_container,
 		select_chain,
 		transaction_pool,
-		other: (block_import, grandpa_link, mut telemetry, data_sources, _),
+		other: (block_import, grandpa_link, mut telemetry, data_sources, _, inherent_config),
 	} = new_partial(&config)?;
 
 	let metrics = Network::register_notification_metrics(config.prometheus_registry());
@@ -317,13 +340,6 @@ pub async fn new_full_base<Network: sc_network::NetworkBackend<Block, <Block as
 		let proposer_factory: PartnerChainsProposerFactory<_, _, McHashInherentDigest> =
 			PartnerChainsProposerFactory::new(basic_authorship_proposer_factory);
 
-		let sc_slot_config = sidechain_slots::runtime_api_client::slot_config(&*client)
-			.map_err(sp_blockchain::Error::from)?;
-		let time_source = Arc::new(SystemTimeSource);
-		let mc_epoch_config = MainchainEpochConfig::read_from_env()
-			.map_err(|err| ServiceError::Application(err.into()))?;
-		let inherent_config =
-			CreateInherentDataConfig::new(mc_epoch_config, sc_slot_config.clone(), time_source);
 		let aura = sc_partner_chains_consensus_aura::start_aura::<
 			AuraPair,
 			_,
@@ -338,7 +354,7 @@ pub async fn new_full_base<Network: sc_network::NetworkBackend<Block, <Block as
 			_,
 			McHashInherentDigest,
 		>(StartAuraParams {
-			slot_duration: sc_slot_config.slot_duration,
+			slot_duration: inherent_config.slot_duration,
 			client: client.clone(),
 			select_chain,
 			block_import,

demo/node/src/staging.rs

@@ -153,8 +153,7 @@ pub fn staging_genesis(
 		sidechain: SidechainConfig {
 			genesis_utxo,
 			epoch_duration: ScEpochDuration::from_millis(
-				SLOT_DURATION
-					* u64::from(sidechain_slots::SlotsPerEpoch::read_from_env().unwrap().0),
+				SLOT_DURATION * read_slots_per_epoch_from_env(),
 			),
 			..Default::default()
 		},

demo/node/src/template_chain_spec.rs

@@ -35,8 +35,7 @@ pub fn chain_spec() -> Result<ChainSpec, envy::Error> {
 		sidechain: SidechainConfig {
 			genesis_utxo,
 			epoch_duration: ScEpochDuration::from_millis(
-				SLOT_DURATION
-					* u64::from(sidechain_slots::SlotsPerEpoch::read_from_env().unwrap().0),
+				SLOT_DURATION * read_slots_per_epoch_from_env(),
 			),
 			..Default::default()
 		},

demo/node/src/testnet.rs

@@ -210,8 +210,7 @@ pub fn testnet_genesis(
 		sidechain: SidechainConfig {
 			genesis_utxo,
 			epoch_duration: ScEpochDuration::from_millis(
-				SLOT_DURATION
-					* u64::from(sidechain_slots::SlotsPerEpoch::read_from_env().unwrap().0),
+				SLOT_DURATION * read_slots_per_epoch_from_env(),
 			),
 			..Default::default()
 		},