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// Copyright 2017-2020 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.
mod grandpa_support;
use polkadot_primitives::{parachain, Hash, BlockId, AccountId, Nonce, Balance};
#[cfg(feature = "full-node")]
use polkadot_network::{legacy::gossip::Known, protocol as network_protocol};
use service::{error::Error as ServiceError, ServiceBuilder};
use grandpa::{self, FinalityProofProvider as GrandpaFinalityProofProvider};
use sc_executor::native_executor_instance;
AbstractService, Role, PruningMode, TransactionPoolOptions, Error, RuntimeGenesis,
TFullClient, TLightClient, TFullBackend, TLightBackend, TFullCallExecutor, TLightCallExecutor,
Configuration, ChainSpec, ServiceBuilderCommand,
pub use service::config::{DatabaseConfig, PrometheusConfig};
pub use sc_executor::NativeExecutionDispatch;
pub use sc_client_api::{Backend, ExecutionStrategy, CallExecutor};
pub use sc_consensus::LongestChain;
pub use sp_api::{Core as CoreApi, ConstructRuntimeApi, ProvideRuntimeApi, StateBackend};
pub use sp_runtime::traits::{HashFor, NumberFor};
pub use consensus_common::{SelectChain, BlockImport, block_validation::Chain};
pub use polkadot_primitives::parachain::{CollatorId, ParachainHost};
pub use sp_runtime::traits::{Block as BlockT, self as runtime_traits, BlakeTwo256};
pub use chain_spec::{PolkadotChainSpec, KusamaChainSpec, WestendChainSpec};
pub use consensus::run_validation_worker;
pub use codec::Codec;
pub use polkadot_runtime;
pub use kusama_runtime;
pub use self::client::PolkadotClient;
native_executor_instance!(
pub PolkadotExecutor,
polkadot_runtime::api::dispatch,
polkadot_runtime::native_version,
frame_benchmarking::benchmarking::HostFunctions,
);
native_executor_instance!(
pub KusamaExecutor,
kusama_runtime::api::dispatch,
kusama_runtime::native_version,
frame_benchmarking::benchmarking::HostFunctions,
native_executor_instance!(
pub WestendExecutor,
westend_runtime::api::dispatch,
westend_runtime::native_version,
frame_benchmarking::benchmarking::HostFunctions,
);
/// A set of APIs that polkadot-like runtimes must implement.
pub trait RuntimeApiCollection<Extrinsic: codec::Codec + Send + Sync + 'static>:
sp_transaction_pool::runtime_api::TaggedTransactionQueue<Block>
+ sp_api::ApiExt<Block, Error = sp_blockchain::Error>
+ babe_primitives::BabeApi<Block>
+ grandpa_primitives::GrandpaApi<Block>
+ ParachainHost<Block>
+ sp_block_builder::BlockBuilder<Block>
+ system_rpc_runtime_api::AccountNonceApi<Block, AccountId, Nonce>
+ pallet_transaction_payment_rpc_runtime_api::TransactionPaymentApi<Block, Balance, Extrinsic>
+ sp_api::Metadata<Block>
+ sp_offchain::OffchainWorkerApi<Block>
+ sp_session::SessionKeys<Block>
+ authority_discovery_primitives::AuthorityDiscoveryApi<Block>
where
Extrinsic: RuntimeExtrinsic,
<Self as sp_api::ApiExt<Block>>::StateBackend: sp_api::StateBackend<BlakeTwo256>,
{}
impl<Api, Extrinsic> RuntimeApiCollection<Extrinsic> for Api
where
Api:
sp_transaction_pool::runtime_api::TaggedTransactionQueue<Block>
+ sp_api::ApiExt<Block, Error = sp_blockchain::Error>
+ babe_primitives::BabeApi<Block>
+ grandpa_primitives::GrandpaApi<Block>
+ ParachainHost<Block>
+ sp_block_builder::BlockBuilder<Block>
+ system_rpc_runtime_api::AccountNonceApi<Block, AccountId, Nonce>
+ pallet_transaction_payment_rpc_runtime_api::TransactionPaymentApi<Block, Balance, Extrinsic>
+ sp_api::Metadata<Block>
+ sp_offchain::OffchainWorkerApi<Block>
+ sp_session::SessionKeys<Block>
+ authority_discovery_primitives::AuthorityDiscoveryApi<Block>,
Extrinsic: RuntimeExtrinsic,
<Self as sp_api::ApiExt<Block>>::StateBackend: sp_api::StateBackend<BlakeTwo256>,
pub trait RuntimeExtrinsic: codec::Codec + Send + Sync + 'static {}
impl<E> RuntimeExtrinsic for E where E: codec::Codec + Send + Sync + 'static {}
/// Can be called for a `Configuration` to check if it is a configuration for the `Kusama` network.
/// Returns if this is a configuration for the `Kusama` network.
fn is_kusama(&self) -> bool;
/// Returns if this is a configuration for the `Westend` network.
fn is_westend(&self) -> bool;
fn is_kusama(&self) -> bool {
self.id().starts_with("kusama") || self.id().starts_with("ksm")
fn is_westend(&self) -> bool {
self.id().starts_with("westend") || self.id().starts_with("wnd")
}
// If we're using prometheus, use a registry with a prefix of `polkadot`.
fn set_prometheus_registry(config: &mut Configuration) -> Result<(), ServiceError> {
if let Some(PrometheusConfig { registry, .. }) = config.prometheus_config.as_mut() {
*registry = Registry::new_custom(Some("polkadot".into()), None)?;
}
Ok(())
}
/// Starts a `ServiceBuilder` for a full service.
///
/// Use this macro if you don't actually need the full service, but just the builder in order to
/// be able to perform chain operations.
macro_rules! new_full_start {
($config:expr, $runtime:ty, $executor:ty) => {{
set_prometheus_registry(&mut $config)?;
let inherent_data_providers = inherents::InherentDataProviders::new();
let builder = service::ServiceBuilder::new_full::<
Block, $runtime, $executor
Ok(sc_consensus::LongestChain::new(backend.clone()))
.with_transaction_pool(|config, client, _fetcher, prometheus_registry| {
let pool_api = sc_transaction_pool::FullChainApi::new(client.clone());
let pool = sc_transaction_pool::BasicPool::new(config, std::sync::Arc::new(pool_api), prometheus_registry);
.with_import_queue(|
config,
client,
mut select_chain,
_,
spawn_task_handle,
registry,
| {
let select_chain = select_chain.take()
.ok_or_else(|| service::Error::SelectChainRequired)?;
let grandpa_hard_forks = if config.chain_spec.is_kusama() {
grandpa_support::kusama_hard_forks()
} else {
Vec::new()
};
let (grandpa_block_import, grandpa_link) =
grandpa::block_import_with_authority_set_hard_forks(
client.clone(),
&(client.clone() as Arc<_>),
select_chain,
grandpa_hard_forks,
let justification_import = grandpa_block_import.clone();
let (block_import, babe_link) = babe::block_import(
babe::Config::get_or_compute(&*client)?,
grandpa_block_import,
client.clone(),
let import_queue = babe::import_queue(
babe_link.clone(),
block_import.clone(),
Some(Box::new(justification_import)),
None,
client,
inherent_data_providers.clone(),
import_setup = Some((block_import, grandpa_link, babe_link));
.with_rpc_extensions_builder(|builder| {
let grandpa_link = import_setup.as_ref().map(|s| &s.1)
.expect("GRANDPA LinkHalf is present for full services or set up failed; qed.");
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let shared_authority_set = grandpa_link.shared_authority_set().clone();
let shared_voter_state = grandpa::SharedVoterState::empty();
rpc_setup = Some((shared_voter_state.clone()));
let babe_link = import_setup.as_ref().map(|s| &s.2)
.expect("BabeLink is present for full services or set up faile; qed.");
let babe_config = babe_link.config().clone();
let shared_epoch_changes = babe_link.epoch_changes().clone();
let client = builder.client().clone();
let pool = builder.pool().clone();
let select_chain = builder.select_chain().cloned()
.expect("SelectChain is present for full services or set up failed; qed.");
let keystore = builder.keystore().clone();
Ok(move |deny_unsafe| -> polkadot_rpc::RpcExtension {
let deps = polkadot_rpc::FullDeps {
client: client.clone(),
pool: pool.clone(),
select_chain: select_chain.clone(),
deny_unsafe,
babe: polkadot_rpc::BabeDeps {
babe_config: babe_config.clone(),
shared_epoch_changes: shared_epoch_changes.clone(),
keystore: keystore.clone(),
},
grandpa: polkadot_rpc::GrandpaDeps {
shared_voter_state: shared_voter_state.clone(),
shared_authority_set: shared_authority_set.clone(),
},
};
polkadot_rpc::create_full(deps)
})
(builder, import_setup, inherent_data_providers, rpc_setup)
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/// Builds a new service for a full client.
#[macro_export]
macro_rules! new_full {
(
$config:expr,
$collating_for:expr,
$max_block_data_size:expr,
$authority_discovery_enabled:expr,
$slot_duration:expr,
$grandpa_pause:expr,
$runtime:ty,
$dispatch:ty
) => {{
use sc_network::Event;
use sc_client_api::ExecutorProvider;
use futures::stream::StreamExt;
let is_collator = $collating_for.is_some();
let role = $config.role.clone();
let is_authority = role.is_authority() && !is_collator;
let force_authoring = $config.force_authoring;
let max_block_data_size = $max_block_data_size;
let db_path = match $config.database.path() {
Some(path) => std::path::PathBuf::from(path),
None => return Err("Starting a Polkadot service with a custom database isn't supported".to_string().into()),
};
let disable_grandpa = $config.disable_grandpa;
let name = $config.network.node_name.clone();
let authority_discovery_enabled = $authority_discovery_enabled;
let slot_duration = $slot_duration;
let (builder, mut import_setup, inherent_data_providers, mut rpc_setup) =
new_full_start!($config, $runtime, $dispatch);
let service = builder
.with_finality_proof_provider(|client, backend| {
let provider = client as Arc<dyn grandpa::StorageAndProofProvider<_, _>>;
Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, provider)) as _)
})?
.build()?;
let (block_import, link_half, babe_link) = import_setup.take()
.expect("Link Half and Block Import are present for Full Services or setup failed before. qed");
let shared_voter_state = rpc_setup.take()
.expect("The SharedVoterState is present for Full Services or setup failed before. qed");
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let client = service.client();
let known_oracle = client.clone();
let mut handles = FullNodeHandles::default();
let select_chain = if let Some(select_chain) = service.select_chain() {
select_chain
} else {
info!("The node cannot start as an authority because it can't select chain.");
return Ok((service, client, handles));
};
let gossip_validator_select_chain = select_chain.clone();
let is_known = move |block_hash: &Hash| {
use consensus_common::BlockStatus;
match known_oracle.block_status(&BlockId::hash(*block_hash)) {
Err(_) | Ok(BlockStatus::Unknown) | Ok(BlockStatus::Queued) => None,
Ok(BlockStatus::KnownBad) => Some(Known::Bad),
Ok(BlockStatus::InChainWithState) | Ok(BlockStatus::InChainPruned) => {
match gossip_validator_select_chain.leaves() {
Err(_) => None,
Ok(leaves) => if leaves.contains(block_hash) {
Some(Known::Leaf)
} else {
Some(Known::Old)
},
}
}
}
};
let polkadot_network_service = network_protocol::start(
service.network(),
network_protocol::Config {
collating_for: $collating_for,
},
(is_known, client.clone()),
client.clone(),
service.spawn_task_handle(),
).map_err(|e| format!("Could not spawn network worker: {:?}", e))?;
let authority_handles = if is_collator || role.is_authority() {
let availability_store = {
use std::path::PathBuf;
let mut path = PathBuf::from(db_path);
path.push("availability");
#[cfg(not(target_os = "unknown"))]
{
av_store::Store::new(
::av_store::Config {
cache_size: None,
path,
},
polkadot_network_service.clone(),
)?
}
#[cfg(target_os = "unknown")]
av_store::Store::new_in_memory(gossip)
};
polkadot_network_service.register_availability_store(availability_store.clone());
let (validation_service_handle, validation_service) = consensus::ServiceBuilder {
client: client.clone(),
network: polkadot_network_service.clone(),
collators: polkadot_network_service.clone(),
spawner: service.spawn_task_handle(),
availability_store: availability_store.clone(),
select_chain: select_chain.clone(),
keystore: service.keystore(),
max_block_data_size,
}.build();
service.spawn_essential_task("validation-service", Box::pin(validation_service));
handles.validation_service_handle = Some(validation_service_handle.clone());
Some((validation_service_handle, availability_store))
} else {
None
};
if role.is_authority() {
let (validation_service_handle, availability_store) = authority_handles
.clone()
.expect("Authority handles are set for authority nodes; qed");
let proposer = consensus::ProposerFactory::new(
client.clone(),
service.transaction_pool(),
validation_service_handle,
slot_duration,
service.prometheus_registry().as_ref(),
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);
let select_chain = service.select_chain().ok_or(ServiceError::SelectChainRequired)?;
let can_author_with =
consensus_common::CanAuthorWithNativeVersion::new(client.executor().clone());
let block_import = availability_store.block_import(
block_import,
client.clone(),
service.spawn_task_handle(),
service.keystore(),
)?;
let babe_config = babe::BabeParams {
keystore: service.keystore(),
client: client.clone(),
select_chain,
block_import,
env: proposer,
sync_oracle: service.network(),
inherent_data_providers: inherent_data_providers.clone(),
force_authoring,
babe_link,
can_author_with,
};
let babe = babe::start_babe(babe_config)?;
service.spawn_essential_task("babe", babe);
}
if matches!(role, Role::Authority{..} | Role::Sentry{..}) {
if authority_discovery_enabled {
let (sentries, authority_discovery_role) = match role {
Role::Authority { ref sentry_nodes } => (
sentry_nodes.clone(),
authority_discovery::Role::Authority (
service.keystore(),
),
),
Role::Sentry {..} => (
vec![],
authority_discovery::Role::Sentry,
),
_ => unreachable!("Due to outer matches! constraint; qed."),
};
let network = service.network();
let network_event_stream = network.event_stream("authority-discovery");
let dht_event_stream = network_event_stream.filter_map(|e| async move { match e {
Event::Dht(e) => Some(e),
_ => None,
}}).boxed();
let authority_discovery = authority_discovery::AuthorityDiscovery::new(
service.client(),
network,
sentries,
dht_event_stream,
authority_discovery_role,
service.prometheus_registry(),
);
service.spawn_task("authority-discovery", authority_discovery);
}
}
// if the node isn't actively participating in consensus then it doesn't
// need a keystore, regardless of which protocol we use below.
let keystore = if is_authority {
Some(service.keystore())
} else {
None
};
let config = grandpa::Config {
// FIXME substrate#1578 make this available through chainspec
gossip_duration: Duration::from_millis(1000),
justification_period: 512,
name: Some(name),
observer_enabled: false,
keystore,
is_authority: role.is_network_authority(),
};
let enable_grandpa = !disable_grandpa;
if enable_grandpa {
// start the full GRANDPA voter
// NOTE: unlike in substrate we are currently running the full
// GRANDPA voter protocol for all full nodes (regardless of whether
// they're validators or not). at this point the full voter should
// provide better guarantees of block and vote data availability than
// the observer.
// add a custom voting rule to temporarily stop voting for new blocks
// after the given pause block is finalized and restarting after the
// given delay.
let voting_rule = match $grandpa_pause {
Some((block, delay)) => {
info!("GRANDPA scheduled voting pause set for block #{} with a duration of {} blocks.",
block,
delay,
);
grandpa::VotingRulesBuilder::default()
.add(grandpa_support::PauseAfterBlockFor(block, delay))
.build()
},
None =>
grandpa::VotingRulesBuilder::default()
.build(),
};
let grandpa_config = grandpa::GrandpaParams {
config,
link: link_half,
network: service.network(),
inherent_data_providers: inherent_data_providers.clone(),
telemetry_on_connect: Some(service.telemetry_on_connect_stream()),
voting_rule,
prometheus_registry: service.prometheus_registry(),
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};
service.spawn_essential_task(
"grandpa-voter",
grandpa::run_grandpa_voter(grandpa_config)?
);
} else {
grandpa::setup_disabled_grandpa(
client.clone(),
&inherent_data_providers,
service.network(),
)?;
}
handles.polkadot_network = Some(polkadot_network_service);
(service, client, handles)
}}
}
/// Builds a new service for a light client.
#[macro_export]
macro_rules! new_light {
($config:expr, $runtime:ty, $dispatch:ty) => {{
crate::set_prometheus_registry(&mut $config)?;
let inherent_data_providers = inherents::InherentDataProviders::new();
ServiceBuilder::new_light::<Block, $runtime, $dispatch>($config)?
.with_select_chain(|_, backend| {
Ok(sc_consensus::LongestChain::new(backend.clone()))
})?
.with_transaction_pool(|config, client, fetcher, prometheus_registry| {
let fetcher = fetcher
.ok_or_else(|| "Trying to start light transaction pool without active fetcher")?;
let pool_api = sc_transaction_pool::LightChainApi::new(client.clone(), fetcher.clone());
let pool = sc_transaction_pool::BasicPool::with_revalidation_type(
config, Arc::new(pool_api), prometheus_registry, sc_transaction_pool::RevalidationType::Light,
);
Ok(pool)
})?
.with_import_queue_and_fprb(|
_config,
client,
backend,
fetcher,
_select_chain,
_,
spawn_task_handle,
registry,
| {
let fetch_checker = fetcher
.map(|fetcher| fetcher.checker().clone())
.ok_or_else(|| "Trying to start light import queue without active fetch checker")?;
let grandpa_block_import = grandpa::light_block_import(
client.clone(), backend, &(client.clone() as Arc<_>), Arc::new(fetch_checker)
)?;
let finality_proof_import = grandpa_block_import.clone();
let finality_proof_request_builder =
finality_proof_import.create_finality_proof_request_builder();
let (babe_block_import, babe_link) = babe::block_import(
babe::Config::get_or_compute(&*client)?,
grandpa_block_import,
client.clone(),
)?;
// FIXME: pruning task isn't started since light client doesn't do `AuthoritySetup`.
let import_queue = babe::import_queue(
babe_link,
babe_block_import,
None,
Some(Box::new(finality_proof_import)),
client,
inherent_data_providers.clone(),
)?;
Ok((import_queue, finality_proof_request_builder))
})?
.with_finality_proof_provider(|client, backend| {
let provider = client as Arc<dyn grandpa::StorageAndProofProvider<_, _>>;
Ok(Arc::new(grandpa::FinalityProofProvider::new(backend, provider)) as _)
})?
.with_rpc_extensions(|builder| {
let fetcher = builder.fetcher()
.ok_or_else(|| "Trying to start node RPC without active fetcher")?;
let remote_blockchain = builder.remote_backend()
.ok_or_else(|| "Trying to start node RPC without active remote blockchain")?;
let light_deps = polkadot_rpc::LightDeps {
remote_blockchain,
fetcher,
client: builder.client().clone(),
pool: builder.pool(),
};
Ok(polkadot_rpc::create_light(light_deps))
/// Builds a new object suitable for chain operations.
pub fn new_chain_ops<Runtime, Dispatch, Extrinsic>(mut config: Configuration)
-> Result<impl ServiceBuilderCommand<Block=Block>, ServiceError>
where
Runtime: ConstructRuntimeApi<Block, service::TFullClient<Block, Runtime, Dispatch>> + Send + Sync + 'static,
RuntimeApiCollection<Extrinsic, StateBackend = sc_client_api::StateBackendFor<TFullBackend<Block>, Block>>,
Dispatch: NativeExecutionDispatch + 'static,
Extrinsic: RuntimeExtrinsic,
<Runtime::RuntimeApi as sp_api::ApiExt<Block>>::StateBackend: sp_api::StateBackend<BlakeTwo256>,
config.keystore = service::config::KeystoreConfig::InMemory;
Ok(new_full_start!(config, Runtime, Dispatch).0)
}
/// Create a new Polkadot service for a full node.
collating_for: Option<(CollatorId, parachain::Id)>,
max_block_data_size: Option<u64>,
authority_discovery_enabled: bool,
slot_duration: u64,
grandpa_pause: Option<(u32, u32)>,
Arc<impl PolkadotClient<
Block,
TFullBackend<Block>,
polkadot_runtime::RuntimeApi
>>,
FullNodeHandles,
), ServiceError>
config,
collating_for,
max_block_data_size,
authority_discovery_enabled,
slot_duration,
grandpa_pause,
polkadot_runtime::RuntimeApi,
PolkadotExecutor
);
Ok((service, client, handles))
}
/// Create a new Kusama service for a full node.
collating_for: Option<(CollatorId, parachain::Id)>,
max_block_data_size: Option<u64>,
authority_discovery_enabled: bool,
slot_duration: u64,
grandpa_pause: Option<(u32, u32)>,
Arc<impl PolkadotClient<
Block,
TFullBackend<Block>,
kusama_runtime::RuntimeApi
>
config,
collating_for,
max_block_data_size,
authority_discovery_enabled,
slot_duration,
grandpa_pause,
kusama_runtime::RuntimeApi,
KusamaExecutor
);
Ok((service, client, handles))
/// Create a new Kusama service for a full node.
#[cfg(feature = "full-node")]
pub fn westend_new_full(
collating_for: Option<(CollatorId, parachain::Id)>,
max_block_data_size: Option<u64>,
authority_discovery_enabled: bool,
slot_duration: u64,
grandpa_pause: Option<(u32, u32)>,
)
-> Result<(
Arc<impl PolkadotClient<
Block,
TFullBackend<Block>,
westend_runtime::RuntimeApi
>>,
config,
collating_for,
max_block_data_size,
authority_discovery_enabled,
slot_duration,
grandpa_pause,
/// Handles to other sub-services that full nodes instantiate, which consumers
/// of the node may use.
#[derive(Default)]
pub struct FullNodeHandles {
/// A handle to the Polkadot networking protocol.
pub polkadot_network: Option<network_protocol::Service>,
/// A handle to the validation service.
pub validation_service_handle: Option<consensus::ServiceHandle>,
/// Create a new Polkadot service for a light client.
pub fn polkadot_new_light(mut config: Configuration) -> Result<
impl AbstractService<
Block = Block,
RuntimeApi = polkadot_runtime::RuntimeApi,
Backend = TLightBackend<Block>,
SelectChain = LongestChain<TLightBackend<Block>, Block>,
CallExecutor = TLightCallExecutor<Block, PolkadotExecutor>,
>, ServiceError>
{
new_light!(config, polkadot_runtime::RuntimeApi, PolkadotExecutor)
}
/// Create a new Kusama service for a light client.
pub fn kusama_new_light(mut config: Configuration) -> Result<
impl AbstractService<
Block = Block,
RuntimeApi = kusama_runtime::RuntimeApi,
Backend = TLightBackend<Block>,
SelectChain = LongestChain<TLightBackend<Block>, Block>,
CallExecutor = TLightCallExecutor<Block, KusamaExecutor>,
>, ServiceError>
{
new_light!(config, kusama_runtime::RuntimeApi, KusamaExecutor)
pub fn westend_new_light(mut config: Configuration, ) -> Result<
impl AbstractService<
Block = Block,
RuntimeApi = westend_runtime::RuntimeApi,
Backend = TLightBackend<Block>,
SelectChain = LongestChain<TLightBackend<Block>, Block>,
CallExecutor = TLightCallExecutor<Block, KusamaExecutor>
new_light!(config, westend_runtime::RuntimeApi, KusamaExecutor)