New sessions, kill consensus module (#2802)

* Draft of new sessions

* Reintroduce tuple impls

* Move staking module to new session API

* More work on staking and grandpa.

* Use iterator to avoid cloning and tuple macro

* Make runtime build again

* Polish the OpaqueKeys devex

* Move consensus logic into system & aura.

* Fix up system module

* Get build mostly going. Stuck at service.rs

* Building again

* Update srml/staking/src/lib.rs

Co-Authored-By: DemiMarie-parity <48690212+DemiMarie-parity@users.noreply.github.com>

* Refactoring out Consensus module, AuthorityIdOf, &c.

* Refactored out DigestItem::AuthoritiesChanged. Building.

* Remove tentative code

* Remove invalid comment

* Make Seal opaque and introduce nice methods for handling opaque items.

* Start to use proper digest for Aura authorities tracking.

* Fix up grandpa, remove system::Raw/Log

* Refactor Grandpa to use new logging infrastructure.

Also make authorityid/sessionkey static. Switch over to storing
authorities in a straight Vec.

* Building again

* Tidy up some AuthorityIds

* Expunge most of the rest of the AuthorityKey confusion.

Also, de-generify Babe and re-generify Aura.

* Remove cruft

* Untangle last of the `AuthorityId`s.

* Sort out finality_tracker

* Refactor median getting

* Apply suggestions from code review

Co-Authored-By: Robert Habermeier <rphmeier@gmail.com>

* Session tests works

* Update core/sr-primitives/src/generic/digest.rs

Co-Authored-By: DemiMarie-parity <48690212+DemiMarie-parity@users.noreply.github.com>

* Session tests works

* Fix for staking from @dvc94ch

* log an error

* fix test runtime build

* Some test fixes

* Staking mock update to new session api.

* Fix build.

* Move OpaqueKeys to primitives.

* Use on_initialize instead of check_rotate_session.

* Update tests to new staking api.

* fixup mock

* Fix bond_extra_and_withdraw_unbonded_works.

* Fix bond_with_little_staked_value_bounded_by_slot_stake.

* Fix bond_with_no_staked_value.

* Fix change_controller_works.

* Fix less_than_needed_candidates_works.

* Fix multi_era_reward_should_work.

* Fix nominating_and_rewards_should_work.

* Fix nominators_also_get_slashed.

* Fix phragmen_large_scale_test.

* Fix phragmen_poc_works.

* Fix phragmen_score_should_be_accurate_on_large_stakes.

* Fix phragmen_should_not_overflow.

* Fix reward_destination_works.

* Fix rewards_should_work.

* Fix sessions_and_eras_should_work.

* Fix slot_stake_is_least_staked_validator.

* Fix too_many_unbond_calls_should_not_work.

* Fix wrong_vote_is_null.

* Fix runtime.

* Fix wasm runtime build.

* Update Cargo.lock

* Fix warnings.

* Fix grandpa tests.

* Fix test-runtime build.

* Fix template node build.

* Fix stuff.

* Update Cargo.lock to fix CI

* Re-add missing AuRa logs

Runtimes are required to know about every digest they receive ― they
panic otherwise.  This re-adds support for AuRa pre-runtime digests.

* Update core/consensus/babe/src/digest.rs

Co-Authored-By: DemiMarie-parity <48690212+DemiMarie-parity@users.noreply.github.com>

* Kill log trait and all that jazz.

* Refactor staking tests.

* Fix ci runtime wasm check.

* Line length 120.

* Make tests build again

* Remove trailing commas in function declarations

The `extern_functions!` macro doesn’t like them, perhaps due to a bug in
rustc.

* Fix type error

* Fix compilation errors

* Fix a test

* Another couple of fixes

* Fix another test

* More test fixes

* Another test fix

* Bump runtime.

* Wrap long line

* Fix build, remove redundant code.

* Issue to track TODO

* Leave the benchmark code alone.

* Fix missing `std::time::{Instant, Duration}`

* Indentation

* Aura ConsensusLog as enum

substrate/core/client/src/client.rs

@@ -36,9 +36,10 @@ use consensus::{
 };
 use runtime_primitives::traits::{
 	Block as BlockT, Header as HeaderT, Zero, NumberFor, CurrentHeight,
-	BlockNumberToHash, ApiRef, ProvideRuntimeApi, Digest, DigestItem,
+	BlockNumberToHash, ApiRef, ProvideRuntimeApi,
 	SaturatedConversion, One, DigestFor,
 };
+use runtime_primitives::generic::DigestItem;
 use runtime_primitives::BuildStorage;
 use crate::runtime_api::{
 	CallRuntimeAt, ConstructRuntimeApi, Core as CoreApi, ProofRecorder,
@@ -1760,8 +1761,7 @@ pub(crate) mod tests {
 	use std::collections::HashMap;
 	use super::*;
 	use primitives::blake2_256;
-	use runtime_primitives::traits::DigestItem as DigestItemT;
-	use runtime_primitives::generic::DigestItem;
+	use runtime_primitives::DigestItem;
 	use consensus::{BlockOrigin, SelectChain};
 	use test_client::{
 		prelude::*,

substrate/core/client/src/in_mem.rs

@@ -20,11 +20,8 @@ use std::collections::HashMap;
 use std::sync::Arc;
 use parking_lot::{RwLock, Mutex};
 use primitives::{ChangesTrieConfiguration, storage::well_known_keys};
-use runtime_primitives::generic::BlockId;
-use runtime_primitives::traits::{
-	Block as BlockT, Header as HeaderT, Zero,
-	NumberFor, Digest, DigestItem
-};
+use runtime_primitives::generic::{BlockId, DigestItem};
+use runtime_primitives::traits::{Block as BlockT, Header as HeaderT, Zero, NumberFor};
 use runtime_primitives::{Justification, StorageOverlay, ChildrenStorageOverlay};
 use state_machine::backend::{Backend as StateBackend, InMemory};
 use state_machine::{self, InMemoryChangesTrieStorage, ChangesTrieAnchorBlockId};
@@ -631,10 +628,9 @@ where
 
 			self.states.write().insert(hash, operation.new_state.unwrap_or_else(|| old_state.clone()));
 
-			let changes_trie_root = header.digest().log(DigestItem::as_changes_trie_root).cloned();
-			if let Some(changes_trie_root) = changes_trie_root {
+			let maybe_changes_trie_root = header.digest().log(DigestItem::as_changes_trie_root).cloned();
+			if let Some(changes_trie_root) = maybe_changes_trie_root {
 				if let Some(changes_trie_update) = operation.changes_trie_update {
-					let changes_trie_root: H::Out = changes_trie_root.into();
 					self.changes_trie_storage.0.insert(
 						*header.number(),
 						changes_trie_root,

substrate/core/client/src/light/call_executor.rs

@@ -552,7 +552,25 @@ mod tests {
 		let local_executor = RemoteCallExecutor::new(Arc::new(backend.blockchain().clone()), Arc::new(OkCallFetcher::new(vec![1])));
 		let remote_executor = RemoteCallExecutor::new(Arc::new(backend.blockchain().clone()), Arc::new(OkCallFetcher::new(vec![2])));
 		let remote_or_local = RemoteOrLocalCallExecutor::new(backend, remote_executor, local_executor);
-		assert_eq!(remote_or_local.call(&BlockId::Number(0), "test_method", &[], ExecutionStrategy::NativeElseWasm, NeverOffchainExt::new()).unwrap(), vec![1]);
-		assert_eq!(remote_or_local.call(&BlockId::Number(1), "test_method", &[], ExecutionStrategy::NativeElseWasm, NeverOffchainExt::new()).unwrap(), vec![2]);
+		assert_eq!(
+			remote_or_local.call(
+				&BlockId::Number(0),
+				"test_method",
+				&[],
+				ExecutionStrategy::NativeElseWasm,
+				NeverOffchainExt::new(),
+			).unwrap(),
+			vec![1],
+		);
+		assert_eq!(
+			remote_or_local.call(
+				&BlockId::Number(1),
+				"test_method",
+				&[],
+				ExecutionStrategy::NativeElseWasm,
+				NeverOffchainExt::new(),
+			).unwrap(),
+			vec![2],
+		);
 	}
 }

substrate/core/client/src/light/fetcher.rs

@@ -501,7 +501,7 @@ pub mod tests {
 		RemoteCallRequest, RemoteHeaderRequest};
 	use crate::light::blockchain::tests::{DummyStorage, DummyBlockchain};
 	use primitives::{blake2_256, Blake2Hasher, H256};
-	use primitives::storage::{StorageKey, well_known_keys};
+	use primitives::storage::{well_known_keys, StorageKey};
 	use runtime_primitives::generic::BlockId;
 	use state_machine::Backend;
 	use super::*;
@@ -564,10 +564,10 @@ pub mod tests {
 		remote_block_header.state_root = remote_client.state_at(&remote_block_id).unwrap().storage_root(::std::iter::empty()).0.into();
 
 		// 'fetch' read proof from remote node
-		let authorities_len = remote_client.storage(&remote_block_id, &StorageKey(well_known_keys::AUTHORITY_COUNT.to_vec()))
+		let heap_pages = remote_client.storage(&remote_block_id, &StorageKey(well_known_keys::HEAP_PAGES.to_vec()))
 			.unwrap()
 			.and_then(|v| Decode::decode(&mut &v.0[..])).unwrap();
-		let remote_read_proof = remote_client.read_proof(&remote_block_id, well_known_keys::AUTHORITY_COUNT).unwrap();
+		let remote_read_proof = remote_client.read_proof(&remote_block_id, well_known_keys::HEAP_PAGES).unwrap();
 
 		// check remote read proof locally
 		let local_storage = InMemoryBlockchain::<Block>::new();
@@ -580,7 +580,7 @@ pub mod tests {
 		).unwrap();
 		let local_executor = test_client::LocalExecutor::new(None);
 		let local_checker = LightDataChecker::new(Arc::new(DummyBlockchain::new(DummyStorage::new())), local_executor);
-		(local_checker, remote_block_header, remote_read_proof, authorities_len)
+		(local_checker, remote_block_header, remote_read_proof, heap_pages)
 	}
 
 	fn prepare_for_header_proof_check(insert_cht: bool) -> (TestChecker, Hash, Header, Vec<Vec<u8>>) {
@@ -619,13 +619,13 @@ pub mod tests {
 
 	#[test]
 	fn storage_read_proof_is_generated_and_checked() {
-		let (local_checker, remote_block_header, remote_read_proof, authorities_len) = prepare_for_read_proof_check();
+		let (local_checker, remote_block_header, remote_read_proof, heap_pages) = prepare_for_read_proof_check();
 		assert_eq!((&local_checker as &dyn FetchChecker<Block>).check_read_proof(&RemoteReadRequest::<Header> {
 			block: remote_block_header.hash(),
 			header: remote_block_header,
-			key: well_known_keys::AUTHORITY_COUNT.to_vec(),
+			key: well_known_keys::HEAP_PAGES.to_vec(),
 			retry_count: None,
-		}, remote_read_proof).unwrap().unwrap()[0], authorities_len as u8);
+		}, remote_read_proof).unwrap().unwrap()[0], heap_pages as u8);
 	}
 
 	#[test]

substrate/core/client/src/runtime_api.rs

@@ -25,7 +25,7 @@ pub use primitives::NativeOrEncoded;
 #[doc(hidden)]
 pub use runtime_primitives::{
 	traits::{
-		AuthorityIdFor, Block as BlockT, GetNodeBlockType, GetRuntimeBlockType,
+		Block as BlockT, GetNodeBlockType, GetRuntimeBlockType,
 		Header as HeaderT, ApiRef, RuntimeApiInfo, Hash as HashT,
 	},
 	generic::BlockId, transaction_validity::TransactionValidity,