lib.rs

// Copyright (C) Parity Technologies (UK) Ltd.
// This file is part of Polkadot.

// Polkadot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Polkadot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.

//! Polkadot service. Specialized wrapper over substrate service.

#![deny(unused_results)]

pub mod benchmarking;
pub mod chain_spec;
mod fake_runtime_api;
mod grandpa_support;
mod parachains_db;
mod relay_chain_selection;

#[cfg(feature = "full-node")]
pub mod overseer;

#[cfg(feature = "full-node")]
pub use self::overseer::{OverseerGen, OverseerGenArgs, RealOverseerGen};

#[cfg(test)]
mod tests;

#[cfg(feature = "full-node")]
use {
	grandpa::{self, FinalityProofProvider as GrandpaFinalityProofProvider},
	gum::info,
	polkadot_node_core_approval_voting::{
		self as approval_voting_subsystem, Config as ApprovalVotingConfig,
	},
	polkadot_node_core_av_store::Config as AvailabilityConfig,
	polkadot_node_core_av_store::Error as AvailabilityError,
	polkadot_node_core_candidate_validation::Config as CandidateValidationConfig,
	polkadot_node_core_chain_selection::{
		self as chain_selection_subsystem, Config as ChainSelectionConfig,
	},
	polkadot_node_core_dispute_coordinator::Config as DisputeCoordinatorConfig,
	polkadot_node_network_protocol::{
		peer_set::PeerSetProtocolNames, request_response::ReqProtocolNames,
	},
	sc_client_api::BlockBackend,
	sc_transaction_pool_api::OffchainTransactionPoolFactory,
	sp_core::traits::SpawnNamed,
	sp_trie::PrefixedMemoryDB,
};

use polkadot_node_subsystem_util::database::Database;

#[cfg(feature = "full-node")]
pub use {
	polkadot_overseer::{Handle, Overseer, OverseerConnector, OverseerHandle},
	polkadot_primitives::runtime_api::ParachainHost,
	relay_chain_selection::SelectRelayChain,
	sc_client_api::AuxStore,
	sp_authority_discovery::AuthorityDiscoveryApi,
	sp_blockchain::{HeaderBackend, HeaderMetadata},
	sp_consensus_babe::BabeApi,
};

#[cfg(feature = "full-node")]
use polkadot_node_subsystem::jaeger;

use std::{sync::Arc, time::Duration};

use prometheus_endpoint::Registry;
#[cfg(feature = "full-node")]
use service::KeystoreContainer;
use service::RpcHandlers;
use telemetry::TelemetryWorker;
#[cfg(feature = "full-node")]
use telemetry::{Telemetry, TelemetryWorkerHandle};

pub use chain_spec::{KusamaChainSpec, PolkadotChainSpec, RococoChainSpec, WestendChainSpec};
pub use consensus_common::{Proposal, SelectChain};
use frame_benchmarking_cli::SUBSTRATE_REFERENCE_HARDWARE;
use mmr_gadget::MmrGadget;
pub use polkadot_primitives::{Block, BlockId, BlockNumber, CollatorPair, Hash, Id as ParaId};
pub use sc_client_api::{Backend, CallExecutor};
pub use sc_consensus::{BlockImport, LongestChain};
pub use sc_executor::NativeExecutionDispatch;
use sc_executor::{HeapAllocStrategy, WasmExecutor, DEFAULT_HEAP_ALLOC_STRATEGY};
pub use service::{
	config::{DatabaseSource, PrometheusConfig},
	ChainSpec, Configuration, Error as SubstrateServiceError, PruningMode, Role, RuntimeGenesis,
	TFullBackend, TFullCallExecutor, TFullClient, TaskManager, TransactionPoolOptions,
};
pub use sp_api::{ApiRef, ConstructRuntimeApi, Core as CoreApi, ProvideRuntimeApi, StateBackend};
pub use sp_runtime::{
	generic,
	traits::{
		self as runtime_traits, BlakeTwo256, Block as BlockT, HashFor, Header as HeaderT, NumberFor,
	},
};

#[cfg(feature = "kusama-native")]
pub use {kusama_runtime, kusama_runtime_constants};
#[cfg(feature = "polkadot-native")]
pub use {polkadot_runtime, polkadot_runtime_constants};
#[cfg(feature = "rococo-native")]
pub use {rococo_runtime, rococo_runtime_constants};
#[cfg(feature = "westend-native")]
pub use {westend_runtime, westend_runtime_constants};

pub use fake_runtime_api::{GetLastTimestamp, RuntimeApi};

#[cfg(feature = "full-node")]
pub type FullBackend = service::TFullBackend<Block>;

#[cfg(feature = "full-node")]
pub type FullClient = service::TFullClient<
	Block,
	RuntimeApi,
	WasmExecutor<(sp_io::SubstrateHostFunctions, frame_benchmarking::benchmarking::HostFunctions)>,
>;

/// The minimum period of blocks on which justifications will be
/// imported and generated.
const GRANDPA_JUSTIFICATION_PERIOD: u32 = 512;

/// Provides the header and block number for a hash.
///
/// Decouples `sc_client_api::Backend` and `sp_blockchain::HeaderBackend`.
pub trait HeaderProvider<Block, Error = sp_blockchain::Error>: Send + Sync + 'static
where
	Block: BlockT,
	Error: std::fmt::Debug + Send + Sync + 'static,
{
	/// Obtain the header for a hash.
	fn header(
		&self,
		hash: <Block as BlockT>::Hash,
	) -> Result<Option<<Block as BlockT>::Header>, Error>;
	/// Obtain the block number for a hash.
	fn number(
		&self,
		hash: <Block as BlockT>::Hash,
	) -> Result<Option<<<Block as BlockT>::Header as HeaderT>::Number>, Error>;
}

impl<Block, T> HeaderProvider<Block> for T
where
	Block: BlockT,
	T: sp_blockchain::HeaderBackend<Block> + 'static,
{
	fn header(
		&self,
		hash: Block::Hash,
	) -> sp_blockchain::Result<Option<<Block as BlockT>::Header>> {
		<Self as sp_blockchain::HeaderBackend<Block>>::header(self, hash)
	}
	fn number(
		&self,
		hash: Block::Hash,
	) -> sp_blockchain::Result<Option<<<Block as BlockT>::Header as HeaderT>::Number>> {
		<Self as sp_blockchain::HeaderBackend<Block>>::number(self, hash)
	}
}

/// Decoupling the provider.
///
/// Mandated since `trait HeaderProvider` can only be
/// implemented once for a generic `T`.
pub trait HeaderProviderProvider<Block>: Send + Sync + 'static
where
	Block: BlockT,
{
	type Provider: HeaderProvider<Block> + 'static;

	fn header_provider(&self) -> &Self::Provider;
}

impl<Block, T> HeaderProviderProvider<Block> for T
where
	Block: BlockT,
	T: sc_client_api::Backend<Block> + 'static,
{
	type Provider = <T as sc_client_api::Backend<Block>>::Blockchain;

	fn header_provider(&self) -> &Self::Provider {
		self.blockchain()
	}
}

#[derive(thiserror::Error, Debug)]
pub enum Error {
	#[error(transparent)]
	Io(#[from] std::io::Error),