Remove node-api (#804)

* Remove `node-api` from `node-consensus` and `node-transaction-pool`

* Remove the `node-api` crate and its last usages

* Remove left over file

* Fixes compilation errors

* Switch to `As` trait

* Rename trait

* Whitespace

substrate/node/consensus/Cargo.toml

@@ -11,7 +11,6 @@ error-chain = "0.12"
 log = "0.3"
 exit-future = "0.1"
 rhododendron = "0.3"
-node-api = { path = "../api" }
 node-primitives = { path = "../primitives" }
 node-runtime = { path = "../runtime" }
 node-transaction-pool = { path = "../transaction-pool" }
@@ -20,6 +19,7 @@ parity-codec = { version = "2.0" }
 substrate-primitives = { path = "../../core/primitives" }
 substrate-client = { path = "../../core/client" }
 sr-primitives = { path = "../../core/sr-primitives" }
+srml-system = { path = "../../srml/system" }
 
 [dev-dependencies]
 substrate-keyring = { path = "../../core/keyring" }

substrate/node/consensus/src/error.rs

@@ -17,10 +17,11 @@
 //! Errors that can occur during the consensus process.
 
 use primitives::AuthorityId;
+use client;
 
 error_chain! {
 	links {
-		Api(::node_api::Error, ::node_api::ErrorKind);
+		Client(client::error::Error, client::error::ErrorKind);
 		Bft(::bft::Error, ::bft::ErrorKind);
 	}
 

substrate/node/consensus/src/evaluation.rs

@@ -20,13 +20,11 @@ use super::MAX_TRANSACTIONS_SIZE;
 
 use codec::{Decode, Encode};
 use node_runtime::{Block as GenericBlock, CheckedBlock};
-use node_primitives::{Block, Hash, BlockNumber, Timestamp};
+use node_primitives::{Hash, BlockNumber, Timestamp};
+use runtime_primitives::traits::{Block as BlockT, Header as HeaderT, As};
+
 
 error_chain! {
-	links {
-		Api(::node_api::Error, ::node_api::ErrorKind);
-	}
-
 	errors {
 		BadProposalFormat {
 			description("Proposal provided not a block."),
@@ -56,12 +54,16 @@ error_chain! {
 
 /// Attempt to evaluate a substrate block as a node block, returning error
 /// upon any initial validity checks failing.
-pub fn evaluate_initial(
+pub fn evaluate_initial<Block: BlockT, Hash>(
 	proposal: &Block,
 	now: Timestamp,
 	parent_hash: &Hash,
-	parent_number: BlockNumber,
-) -> Result<CheckedBlock> {
+	parent_number: <<Block as BlockT>::Header as HeaderT>::Number,
+) -> Result<CheckedBlock>
+where
+	Hash: PartialEq<<<GenericBlock as BlockT>::Header as HeaderT>::Hash>,
+	Hash: Into<self::Hash> + Clone,
+{
 	const MAX_TIMESTAMP_DRIFT: Timestamp = 60;
 
 	let encoded = Encode::encode(proposal);
@@ -77,12 +79,12 @@ pub fn evaluate_initial(
 		bail!(ErrorKind::ProposalTooLarge(transactions_size))
 	}
 
-	if proposal.header.parent_hash != *parent_hash {
-		bail!(ErrorKind::WrongParentHash(*parent_hash, proposal.header.parent_hash));
+	if *parent_hash != *proposal.header().parent_hash() {
+		bail!(ErrorKind::WrongParentHash((*parent_hash).clone().into(), proposal.header.parent_hash));
 	}
 
-	if proposal.header.number != parent_number + 1 {
-		bail!(ErrorKind::WrongNumber(parent_number + 1, proposal.header.number));
+	if parent_number.as_() + 1 != *proposal.header().number() {
+		bail!(ErrorKind::WrongNumber(parent_number.as_() + 1, proposal.header.number));
 	}
 
 	let block_timestamp = proposal.timestamp();

substrate/node/consensus/src/lib.rs

@@ -17,7 +17,6 @@
 //! This service uses BFT consensus provided by the substrate.
 
 extern crate parking_lot;
-extern crate node_api;
 extern crate node_transaction_pool as transaction_pool;
 extern crate node_runtime;
 extern crate node_primitives;
@@ -26,6 +25,7 @@ extern crate substrate_bft as bft;
 extern crate parity_codec as codec;
 extern crate substrate_primitives as primitives;
 extern crate sr_primitives as runtime_primitives;
+extern crate srml_system;
 extern crate substrate_client as client;
 
 extern crate exit_future;
@@ -45,12 +45,15 @@ extern crate substrate_keyring;
 use std::sync::Arc;
 use std::time::{self, Duration, Instant};
 
+use client::{Client as SubstrateClient, CallExecutor};
 use codec::{Decode, Encode};
-use node_api::Api;
-use node_primitives::{AccountId, Hash, Block, BlockId, BlockNumber, Header, Timestamp, SessionKey};
-use runtime_primitives::generic::Era;
-use primitives::{AuthorityId, ed25519};
-use transaction_pool::TransactionPool;
+use node_primitives::{AccountId, Timestamp, SessionKey, InherentData};
+use node_runtime::Runtime;
+use primitives::{AuthorityId, ed25519, Blake2Hasher};
+use runtime_primitives::traits::{Block as BlockT, Hash as HashT, Header as HeaderT, As};
+use runtime_primitives::generic::{BlockId, Era};
+use srml_system::Trait as SystemT;
+use transaction_pool::{TransactionPool, Client as TPClient};
 use tokio::runtime::TaskExecutor;
 use tokio::timer::Delay;
 
@@ -58,7 +61,7 @@ use futures::prelude::*;
 use futures::future;
 use parking_lot::RwLock;
 
-pub use self::error::{ErrorKind, Error};
+pub use self::error::{ErrorKind, Error, Result};
 pub use self::offline_tracker::OfflineTracker;
 pub use service::Service;
 
@@ -73,33 +76,133 @@ pub type SharedOfflineTracker = Arc<RwLock<OfflineTracker>>;
 // block size limit.
 const MAX_TRANSACTIONS_SIZE: usize = 4 * 1024 * 1024;
 
+/// Build new blocks.
+pub trait BlockBuilder<Block: BlockT> {
+	/// Push an extrinsic onto the block. Fails if the extrinsic is invalid.
+	fn push_extrinsic(&mut self, extrinsic: <Block as BlockT>::Extrinsic) -> Result<()>;
+
+	/// Bake the block with provided extrinsics.
+	fn bake(self) -> Result<Block>;
+}
+
+/// Local client abstraction for the consensus.
+pub trait AuthoringApi: Send + Sync {
+	/// The block used for this API type.
+	type Block: BlockT;
+	/// The block builder for this API type.
+	type BlockBuilder: BlockBuilder<Self::Block>;
+
+	/// Get the value of the randomness beacon at a given block.
+	fn random_seed(&self, at: &BlockId<Self::Block>) -> Result<<Self::Block as BlockT>::Hash>;
+
+	/// Get validators at a given block.
+	fn validators(&self, at: &BlockId<Self::Block>) -> Result<Vec<AccountId>>;
+
+	/// Build a block on top of the given, with inherent extrinsics pre-pushed.
+	fn build_block(&self, at: &BlockId<Self::Block>, inherent_data: InherentData) -> Result<Self::BlockBuilder>;
+
+	/// Get the nonce (né index) of an account at a block.
+	fn index(&self, at: &BlockId<Self::Block>, account: AccountId) -> Result<u64>;
+
+	/// Attempt to produce the (encoded) inherent extrinsics for a block being built upon the given.
+	/// This may vary by runtime and will fail if a runtime doesn't follow the same API.
+	fn inherent_extrinsics(&self, at: &BlockId<Self::Block>, inherent_data: InherentData) -> Result<Vec<<Self::Block as BlockT>::Extrinsic>>;
+
+	/// Evaluate a block. Returns true if the block is good, false if it is known to be bad,
+	/// and an error if we can't evaluate for some reason.
+	fn evaluate_block(&self, at: &BlockId<Self::Block>, block: Self::Block) -> Result<bool>;
+}
+
+impl<B, E, Block> BlockBuilder<Block> for client::block_builder::BlockBuilder<B, E, Block, Blake2Hasher> where
+	B: client::backend::Backend<Block, Blake2Hasher> + Send + Sync + 'static,
+	E: CallExecutor<Block, Blake2Hasher> + Send + Sync + Clone + 'static,
+	Block: BlockT
+{
+	fn push_extrinsic(&mut self, extrinsic: <Block as BlockT>::Extrinsic) -> Result<()> {
+		client::block_builder::BlockBuilder::push(self, extrinsic).map_err(Into::into)
+	}
+
+	fn bake(self) -> Result<Block> {
+		client::block_builder::BlockBuilder::bake(self).map_err(Into::into)
+	}
+}
+
+impl<B, E, Block> AuthoringApi for SubstrateClient<B, E, Block> where
+	B: client::backend::Backend<Block, Blake2Hasher> + Send + Sync + 'static,
+	E: CallExecutor<Block, Blake2Hasher> + Send + Sync + Clone + 'static,
+	Block: BlockT,
+{
+	type Block = Block;
+	type BlockBuilder = client::block_builder::BlockBuilder<B, E, Block, Blake2Hasher>;
+
+	fn random_seed(&self, at: &BlockId<Block>) -> Result<<Self::Block as BlockT>::Hash> {
+		self.call_api_at(at, "random_seed", &()).map_err(Into::into)
+	}
+
+	fn validators(&self, at: &BlockId<Block>) -> Result<Vec<AccountId>> {
+		self.call_api_at(at, "validators", &()).map_err(Into::into)
+	}
+
+	fn build_block(&self, at: &BlockId<Block>, inherent_data: InherentData) -> Result<Self::BlockBuilder> {
+		let runtime_version = self.runtime_version_at(at)?;
+
+		let mut block_builder = self.new_block_at(at)?;
+		if runtime_version.has_api(*b"inherent", 1) {
+			for inherent in self.inherent_extrinsics(at, inherent_data)? {
+				block_builder.push(inherent)?;
+			}
+		}
+		Ok(block_builder)
+	}
+
+	fn index(&self, at: &BlockId<Block>, account: AccountId) -> Result<u64> {
+		self.call_api_at(at, "account_nonce", &account).map_err(Into::into)
+	}
+
+	fn inherent_extrinsics(&self, at: &BlockId<Self::Block>, inherent_data: InherentData) -> Result<Vec<<Block as BlockT>::Extrinsic>> {
+		self.call_api_at(at, "inherent_extrinsics", &inherent_data).map_err(Into::into)
+	}
+
+	fn evaluate_block(&self, at: &BlockId<Self::Block>, block: Self::Block) -> Result<bool> {
+		let res: client::error::Result<()> = self.call_api_at(at, "execute_block", &block);
+		match res {
+			Ok(()) => Ok(true),
+			Err(err) => match err.kind() {
+				&client::error::ErrorKind::Execution(_) => Ok(false),
+				_ => Err(err.into())
+			}
+		}
+	}
+}
+
 /// A long-lived network which can create BFT message routing processes on demand.
 pub trait Network {
+	/// The block used for this API type.
+	type Block: BlockT;
 	/// The input stream of BFT messages. Should never logically conclude.
-	type Input: Stream<Item=bft::Communication<Block>,Error=Error>;
+	type Input: Stream<Item=bft::Communication<Self::Block>,Error=Error>;
 	/// The output sink of BFT messages. Messages sent here should eventually pass to all
 	/// current authorities.
-	type Output: Sink<SinkItem=bft::Communication<Block>,SinkError=Error>;
+	type Output: Sink<SinkItem=bft::Communication<Self::Block>,SinkError=Error>;
 
 	/// Instantiate input and output streams.
 	fn communication_for(
 		&self,
 		validators: &[SessionKey],
 		local_id: SessionKey,
-		parent_hash: Hash,
+		parent_hash: <Self::Block as BlockT>::Hash,
 		task_executor: TaskExecutor
 	) -> (Self::Input, Self::Output);
 }
 
 /// Proposer factory.
-pub struct ProposerFactory<N, P>
-	where
-		P: Api + Send + Sync + 'static
+pub struct ProposerFactory<N, C> where
+	C: AuthoringApi + TPClient,
 {
 	/// The client instance.
-	pub client: Arc<P>,
+	pub client: Arc<C>,
 	/// The transaction pool.
-	pub transaction_pool: Arc<TransactionPool<P>>,
+	pub transaction_pool: Arc<TransactionPool<C>>,
 	/// The backing network handle.
 	pub network: N,
 	/// handle to remote task executor
@@ -108,32 +211,31 @@ pub struct ProposerFactory<N, P>
 	pub offline: SharedOfflineTracker,
 }
 
-impl<N, P> bft::Environment<Block> for ProposerFactory<N, P>
-	where
-		N: Network,
-		P: Api + Send + Sync + 'static,
+impl<N, C> bft::Environment<<C as AuthoringApi>::Block> for ProposerFactory<N, C> where
+	N: Network<Block=<C as AuthoringApi>::Block>,
+	C: AuthoringApi + TPClient<Block=<C as AuthoringApi>::Block>,
+	<<C as AuthoringApi>::Block as BlockT>::Hash:
+		Into<<Runtime as SystemT>::Hash> + PartialEq<primitives::H256> + Into<primitives::H256>
 {
-	type Proposer = Proposer<P>;
+	type Proposer = Proposer<C>;
 	type Input = N::Input;
 	type Output = N::Output;
 	type Error = Error;
 
 	fn init(
 		&self,
-		parent_header: &Header,
+		parent_header: &<<C as AuthoringApi>::Block as BlockT>::Header,
 		authorities: &[AuthorityId],
 		sign_with: Arc<ed25519::Pair>,
-	) -> Result<(Self::Proposer, Self::Input, Self::Output), Error> {
-		use runtime_primitives::traits::{Hash as HashT, BlakeTwo256};
-
+	) -> Result<(Self::Proposer, Self::Input, Self::Output)> {
 		// force delay in evaluation this long.
 		const FORCE_DELAY: Timestamp = 5;
 
-		let parent_hash = parent_header.hash().into();
+		let parent_hash = parent_header.hash();
 
 		let id = BlockId::hash(parent_hash);
 		let random_seed = self.client.random_seed(&id)?;
-		let random_seed = BlakeTwo256::hash(&*random_seed);
+		let random_seed = <<<C as AuthoringApi>::Block as BlockT>::Header as HeaderT>::Hashing::hash(random_seed.as_ref());
 
 		let validators = self.client.validators(&id)?;
 		self.offline.write().note_new_block(&validators[..]);
@@ -154,7 +256,7 @@ impl<N, P> bft::Environment<Block> for ProposerFactory<N, P>
 			local_key: sign_with,
 			parent_hash,
 			parent_id: id,
-			parent_number: parent_header.number,
+			parent_number: *parent_header.number(),
 			random_seed,
 			transaction_pool: self.transaction_pool.clone(),
 			offline: self.offline.clone(),
@@ -167,43 +269,42 @@ impl<N, P> bft::Environment<Block> for ProposerFactory<N, P>
 }
 
 /// The proposer logic.
-pub struct Proposer<C: Api + Send + Sync> {
+pub struct Proposer<C: AuthoringApi + TPClient> {
 	client: Arc<C>,
 	start: Instant,
 	local_key: Arc<ed25519::Pair>,
-	parent_hash: Hash,
-	parent_id: BlockId,
-	parent_number: BlockNumber,
-	random_seed: Hash,
+	parent_hash: <<C as AuthoringApi>::Block as BlockT>::Hash,
+	parent_id: BlockId<<C as AuthoringApi>::Block>,
+	parent_number: <<<C as AuthoringApi>::Block as BlockT>::Header as HeaderT>::Number,
+	random_seed: <<C as AuthoringApi>::Block as BlockT>::Hash,
 	transaction_pool: Arc<TransactionPool<C>>,
 	offline: SharedOfflineTracker,
 	validators: Vec<AccountId>,
 	minimum_timestamp: u64,
 }
 
-impl<C: Api + Send + Sync> Proposer<C> {
+impl<C: AuthoringApi + TPClient> Proposer<C> {
 	fn primary_index(&self, round_number: usize, len: usize) -> usize {
 		use primitives::uint::U256;
 
 		let big_len = U256::from(len);
-		let offset = U256::from_big_endian(&self.random_seed.0) % big_len;
+		let offset = U256::from_big_endian(self.random_seed.as_ref()) % big_len;
 		let offset = offset.low_u64() as usize + round_number;
 		offset % len
 	}
 }
 
-impl<C> bft::Proposer<Block> for Proposer<C>
-	where
-		C: Api + Send + Sync,
+impl<C> bft::Proposer<<C as AuthoringApi>::Block> for Proposer<C> where
+	C: AuthoringApi + TPClient<Block=<C as AuthoringApi>::Block>,
+	<<C as AuthoringApi>::Block as BlockT>::Hash:
+		Into<<Runtime as SystemT>::Hash> + PartialEq<primitives::H256> + Into<primitives::H256>
 {
-	type Create = Result<Block, Error>;
+	type Create = Result<<C as AuthoringApi>::Block>;
 	type Error = Error;
 	type Evaluate = Box<Future<Item=bool, Error=Error>>;
 
-	fn propose(&self) -> Result<Block, Error> {
-		use node_api::BlockBuilder;
-		use runtime_primitives::traits::{Hash as HashT, BlakeTwo256};
-		use node_primitives::InherentData;
+	fn propose(&self) -> Result<<C as AuthoringApi>::Block> {
+		use runtime_primitives::traits::BlakeTwo256;
 
 		const MAX_VOTE_OFFLINE_SECONDS: Duration = Duration::from_secs(60);
 
@@ -259,10 +360,10 @@ impl<C> bft::Proposer<Block> for Proposer<C>
 		let block = block_builder.bake()?;
 
 		info!("Proposing block [number: {}; hash: {}; parent_hash: {}; extrinsics: [{}]]",
-			  block.header.number,
-			  Hash::from(block.header.hash()),
-			  block.header.parent_hash,
-			  block.extrinsics.iter()
+			  block.header().number(),
+			  <<C as AuthoringApi>::Block as BlockT>::Hash::from(block.header().hash()),
+			  block.header().parent_hash(),
+			  block.extrinsics().iter()
 			  .map(|xt| format!("{}", BlakeTwo256::hash_of(xt)))
 			  .collect::<Vec<_>>()
 			  .join(", ")
@@ -281,7 +382,7 @@ impl<C> bft::Proposer<Block> for Proposer<C>
 		Ok(substrate_block)
 	}
 
-	fn evaluate(&self, unchecked_proposal: &Block) -> Self::Evaluate {
+	fn evaluate(&self, unchecked_proposal: &<C as AuthoringApi>::Block) -> Self::Evaluate {
 		debug!(target: "bft", "evaluating block on top of parent ({}, {:?})", self.parent_number, self.parent_hash);
 
 		let current_timestamp = current_timestamp();
@@ -359,10 +460,9 @@ impl<C> bft::Proposer<Block> for Proposer<C>
 		proposer
 	}
 
-	fn import_misbehavior(&self, misbehavior: Vec<(AuthorityId, bft::Misbehavior<Hash>)>) {
+	fn import_misbehavior(&self, misbehavior: Vec<(AuthorityId, bft::Misbehavior<<<C as AuthoringApi>::Block as BlockT>::Hash>)>) {
 		use rhododendron::Misbehavior as GenericMisbehavior;
 		use runtime_primitives::bft::{MisbehaviorKind, MisbehaviorReport};
-		use node_primitives::UncheckedExtrinsic as GenericExtrinsic;
 		use node_runtime::{Call, UncheckedExtrinsic, ConsensusCall};
 
 		let local_id = self.local_key.public().0.into();
@@ -371,7 +471,7 @@ impl<C> bft::Proposer<Block> for Proposer<C>
 				.filter(|tx| tx.verified.sender == local_id)
 				.last()
 				.map(|tx| Ok(tx.verified.index()))
-				.unwrap_or_else(|| self.client.index(&self.parent_id, local_id))
+				.unwrap_or_else(|| AuthoringApi::index(self.client.as_ref(), &self.parent_id, local_id))
 			);
 
 			match cur_index {
@@ -389,16 +489,16 @@ impl<C> bft::Proposer<Block> for Proposer<C>
 
 		for (target, misbehavior) in misbehavior {
 			let report = MisbehaviorReport {
-				parent_hash: self.parent_hash,
-				parent_number: self.parent_number,
+				parent_hash: self.parent_hash.into(),
+				parent_number: self.parent_number.as_(),
 				target,
 				misbehavior: match misbehavior {
 					GenericMisbehavior::ProposeOutOfTurn(_, _, _) => continue,
 					GenericMisbehavior::DoublePropose(_, _, _) => continue,
 					GenericMisbehavior::DoublePrepare(round, (h1, s1), (h2, s2))
-						=> MisbehaviorKind::BftDoublePrepare(round as u32, (h1, s1.signature), (h2, s2.signature)),
+						=> MisbehaviorKind::BftDoublePrepare(round as u32, (h1.into(), s1.signature), (h2.into(), s2.signature)),
 					GenericMisbehavior::DoubleCommit(round, (h1, s1), (h2, s2))
-						=> MisbehaviorKind::BftDoubleCommit(round as u32, (h1, s1.signature), (h2, s2.signature)),
+						=> MisbehaviorKind::BftDoubleCommit(round as u32, (h1.into(), s1.signature), (h2.into(), s2.signature)),
 				}
 			};
 			let payload = (next_index, Call::Consensus(ConsensusCall::report_misbehavior(report)), Era::immortal(), self.client.genesis_hash());
@@ -410,8 +510,9 @@ impl<C> bft::Proposer<Block> for Proposer<C>
 				signature: Some((node_runtime::RawAddress::Id(local_id), signature, payload.0, Era::immortal())),
 				function: payload.1,
 			};
-			let uxt: GenericExtrinsic = Decode::decode(&mut extrinsic.encode().as_slice()).expect("Encoded extrinsic is valid");
-			self.transaction_pool.submit_one(&BlockId::hash(self.parent_hash), uxt)
+			let uxt: <<C as AuthoringApi>::Block as BlockT>::Extrinsic = Decode::decode(&mut extrinsic.encode().as_slice()).expect("Encoded extrinsic is valid");
+			let hash = BlockId::<<C as AuthoringApi>::Block>::hash(self.parent_hash);
+			self.transaction_pool.submit_one(&hash, uxt)
 				.expect("locally signed extrinsic is valid; qed");
 		}
 	}

substrate/node/consensus/src/service.rs

@@ -26,16 +26,16 @@ use bft::{self, BftService};
 use client::{BlockchainEvents, ChainHead, BlockBody};
 use ed25519;
 use futures::prelude::*;
-use node_api::Api;
-use node_primitives::{Block, Header};
-use transaction_pool::TransactionPool;
+use transaction_pool::{TransactionPool, Client as TPClient};
+use primitives;
+use runtime_primitives::traits::{Block as BlockT, Header as HeaderT};
 
 use tokio::executor::current_thread::TaskExecutor as LocalThreadHandle;
 use tokio::runtime::TaskExecutor as ThreadPoolHandle;
 use tokio::runtime::current_thread::Runtime as LocalRuntime;
 use tokio::timer::Interval;
 
-use super::{Network, ProposerFactory};
+use super::{Network, ProposerFactory, AuthoringApi};
 use error;
 
 const TIMER_DELAY_MS: u64 = 5000;
@@ -43,15 +43,16 @@ const TIMER_INTERVAL_MS: u64 = 500;
 
 // spin up an instance of BFT agreement on the current thread's executor.
 // panics if there is no current thread executor.
-fn start_bft<F, C>(
-	header: Header,
+fn start_bft<F, C, Block>(
+	header: <Block as BlockT>::Header,
 	bft_service: Arc<BftService<Block, F, C>>,
 ) where
 	F: bft::Environment<Block> + 'static,
 	C: bft::BlockImport<Block> + bft::Authorities<Block> + 'static,
 	F::Error: ::std::fmt::Debug,
 	<F::Proposer as bft::Proposer<Block>>::Error: ::std::fmt::Display + Into<error::Error>,
-	<F as bft::Environment<Block>>::Error: ::std::fmt::Display
+	<F as bft::Environment<Block>>::Error: ::std::fmt::Display,
+	Block: BlockT,
 {
 	let mut handle = LocalThreadHandle::current();
 	match bft_service.build_upon(&header) {
@@ -80,10 +81,15 @@ impl Service {
 		key: ed25519::Pair,
 	) -> Service
 		where
-			A: Api + Send + Sync + 'static,
-			C: BlockchainEvents<Block> + ChainHead<Block> + BlockBody<Block>,
-			C: bft::BlockImport<Block> + bft::Authorities<Block> + Send + Sync + 'static,
-			N: Network + Send + 'static,
+			A: AuthoringApi + TPClient<Block = <A as AuthoringApi>::Block> + 'static,
+			C: BlockchainEvents<<A as AuthoringApi>::Block>
+				+ ChainHead<<A as AuthoringApi>::Block>
+				+ BlockBody<<A as AuthoringApi>::Block>,
+			C: bft::BlockImport<<A as AuthoringApi>::Block>
+				+ bft::Authorities<<A as AuthoringApi>::Block> + Send + Sync + 'static,
+			primitives::H256: From<<<A as AuthoringApi>::Block as BlockT>::Hash>,
+			<<A as AuthoringApi>::Block as BlockT>::Hash: PartialEq<primitives::H256> + PartialEq,
+			N: Network<Block = <A as AuthoringApi>::Block> + Send + 'static,
 	{
 		use parking_lot::RwLock;
 		use super::OfflineTracker;