Punish offline validators, aura-style (#1216)

* make offline-reporting infrastructure more generic

* add a listener-trait for watching when the timestamp has been set

* prevent inclusion of empty offline reports

* add test for exclusion

* generate aura-offline reports

* ability to slash many times for being offline "multiple" times

* Logic for punishing validators for missing aura steps

* stub tests

* pave way for verification of timestamp vs slot

* alter aura import queue to wait for timestamp

* check timestamp matches seal

* do inherent check properly

* service compiles

* all tests compile

* test srml-aura logic

* aura tests pass

* everything builds

* some more final tweaks to block authorship for aura

* switch to manual delays before step

* restore substrate-consensus-aura to always std and address grumbles

* update some state roots in executor tests

* node-executor tests pass

* get most tests passing

* address grumbles

substrate/node/cli/src/chain_spec.rs

@@ -50,7 +50,7 @@ fn staging_testnet_config_genesis() -> GenesisConfig {
 	const CENTS: u128 = 1_000 * MILLICENTS;    // assume this is worth about a cent.
 	const DOLLARS: u128 = 100 * CENTS;
 
-	const SECS_PER_BLOCK: u64 = 4;
+	const SECS_PER_BLOCK: u64 = 6;
 	const MINUTES: u64 = 60 / SECS_PER_BLOCK;
 	const HOURS: u64 = MINUTES * 60;
 	const DAYS: u64 = HOURS * 24;
@@ -111,7 +111,7 @@ fn staging_testnet_config_genesis() -> GenesisConfig {
 			enact_delay_period: 0,
 		}),
 		timestamp: Some(TimestampConfig {
-			period: SECS_PER_BLOCK,
+			period: SECS_PER_BLOCK / 2, // due to the nature of aura the slots are 2*period
 		}),
 		treasury: Some(TreasuryConfig {
 			proposal_bond: Permill::from_percent(5),
@@ -234,7 +234,7 @@ pub fn testnet_genesis(
 			enact_delay_period: 0,
 		}),
 		timestamp: Some(TimestampConfig {
-			period: 5,                    // 5 second block time.
+			period: 2,                    // 2*2=4 second block time.
 		}),
 		treasury: Some(TreasuryConfig {
 			proposal_bond: Permill::from_percent(5),

substrate/node/cli/src/lib.rs

@@ -33,7 +33,6 @@ extern crate substrate_transaction_pool as transaction_pool;
 #[macro_use]
 extern crate substrate_network as network;
 extern crate substrate_consensus_aura as consensus;
-extern crate substrate_consensus_common as consensus_common;
 extern crate substrate_client as client;
 extern crate substrate_finality_grandpa as grandpa;
 extern crate node_primitives;
@@ -45,7 +44,6 @@ extern crate substrate_keystore;
 #[macro_use]
 extern crate log;
 extern crate structopt;
-extern crate parking_lot;
 
 pub use cli::error;
 pub mod chain_spec;

substrate/node/cli/src/service.rs

@@ -21,22 +21,18 @@
 use std::sync::Arc;
 use transaction_pool::{self, txpool::{Pool as TransactionPool}};
 use node_runtime::{GenesisConfig, RuntimeApi};
-use node_primitives::Block;
+use node_primitives::{Block, InherentData};
 use substrate_service::{
 	FactoryFullConfiguration, LightComponents, FullComponents, FullBackend,
 	FullClient, LightClient, LightBackend, FullExecutor, LightExecutor, TaskExecutor
 };
 use node_executor;
-use consensus::{import_queue, start_aura, Config as AuraConfig, AuraImportQueue, NothingExtra};
-use consensus_common::offline_tracker::OfflineTracker;
+use consensus::{import_queue, start_aura, AuraImportQueue, SlotDuration, NothingExtra};
 use primitives::ed25519::Pair;
 use client;
 use std::time::Duration;
-use parking_lot::RwLock;
 use grandpa;
 
-const AURA_SLOT_DURATION: u64 = 6;
-
 construct_simple_protocol! {
 	/// Demo protocol attachment for substrate.
 	pub struct NodeProtocol where Block = Block { }
@@ -105,15 +101,13 @@ construct_service_factory! {
 					let proposer = Arc::new(substrate_service::ProposerFactory {
 						client: service.client(),
 						transaction_pool: service.transaction_pool(),
-						offline: Arc::new(RwLock::new(OfflineTracker::new())),
-						force_delay: 0 // FIXME: allow this to be configured https://github.com/paritytech/substrate/issues/1170
 					});
+
+					let client = service.client();
 					executor.spawn(start_aura(
-						AuraConfig {
-							local_key: Some(key),
-							slot_duration: AURA_SLOT_DURATION,
-						},
-						service.client(),
+						SlotDuration::get_or_compute(&*client)?,
+						key,
+						client,
 						block_import.clone(),
 						proposer,
 						service.network(),
@@ -124,31 +118,39 @@ construct_service_factory! {
 		},
 		LightService = LightComponents<Self>
 			{ |config, executor| <LightComponents<Factory>>::new(config, executor) },
-		FullImportQueue = AuraImportQueue<Self::Block, grandpa::BlockImportForService<Self>, NothingExtra>
+		FullImportQueue = AuraImportQueue<
+			Self::Block,
+			grandpa::BlockImportForService<Self>,
+			NothingExtra,
+			::consensus::InherentProducingFn<InherentData>,
+		>
 			{ |config: &mut FactoryFullConfiguration<Self> , client: Arc<FullClient<Self>>| {
+				let slot_duration = SlotDuration::get_or_compute(&*client)?;
 				let (block_import, link_half) = grandpa::block_import::<_, _, _, RuntimeApi, FullClient<Self>>(client.clone(), client)?;
 				let block_import = Arc::new(block_import);
 
 				config.custom.grandpa_import_setup = Some((block_import.clone(), link_half));
 
 				Ok(import_queue(
-					AuraConfig {
-						local_key: None,
-						slot_duration: 5
-					},
+					slot_duration,
 					block_import,
 					NothingExtra,
+					::consensus::make_basic_inherent as _,
 				))
 			}},
-		LightImportQueue = AuraImportQueue<Self::Block, LightClient<Self>, NothingExtra>
-			{ |ref mut config, client| Ok(
-				import_queue(AuraConfig {
-					local_key: None,
-					slot_duration: 5
-				},
-				client,
-				NothingExtra,
-			))
+		LightImportQueue = AuraImportQueue<
+			Self::Block,
+			LightClient<Self>,
+			NothingExtra,
+			::consensus::InherentProducingFn<InherentData>,
+		>
+			{ |ref mut config, client: Arc<LightClient<Self>>|
+				Ok(import_queue(
+					SlotDuration::get_or_compute(&*client)?,
+					client,
+					NothingExtra,
+					::consensus::make_basic_inherent as _,
+				))
 			},
 	}
 }
@@ -165,7 +167,6 @@ mod tests {
 		let bob: Arc<ed25519::Pair> = Arc::new(Keyring::Bob.into());
 		let validators = vec![alice.public().0.into(), bob.public().0.into()];
 		let keys: Vec<&ed25519::Pair> = vec![&*alice, &*bob];
-		let offline = Arc::new(RwLock::new(OfflineTracker::new()));
 		let dummy_runtime = ::tokio::runtime::Runtime::new().unwrap();
 		let block_factory = |service: &<Factory as service::ServiceFactory>::FullService| {
 			let block_id = BlockId::number(service.client().info().unwrap().chain.best_number);
@@ -175,7 +176,6 @@ mod tests {
 				client: service.client().clone(),
 				transaction_pool: service.transaction_pool().clone(),
 				network: consensus_net,
-				offline: offline.clone(),
 				force_delay: 0,
 				handle: dummy_runtime.executor(),
 			};