[do not merge] multi-block EPM and staking (for benchmarking)

Cargo.toml

@@ -339,8 +339,10 @@ members = [
 	"substrate/frame/core-fellowship",
 	"substrate/frame/delegated-staking",
 	"substrate/frame/democracy",
+	"substrate/frame/election-provider-multi-block",
+	"substrate/frame/election-provider-multi-block/integration-tests",
 	"substrate/frame/election-provider-multi-phase",
-	"substrate/frame/election-provider-multi-phase/test-staking-e2e",
+  #"substrate/frame/election-provider-multi-phase/test-staking-e2e",
 	"substrate/frame/election-provider-support",
 	"substrate/frame/election-provider-support/benchmarking",
 	"substrate/frame/election-provider-support/solution-type",
@@ -911,6 +913,7 @@ pallet-default-config-example = { path = "substrate/frame/examples/default-confi
 pallet-delegated-staking = { path = "substrate/frame/delegated-staking", default-features = false }
 pallet-democracy = { path = "substrate/frame/democracy", default-features = false }
 pallet-dev-mode = { path = "substrate/frame/examples/dev-mode", default-features = false }
+pallet-election-provider-multi-block = { path = "substrate/frame/election-provider-multi-block", default-features = false }
 pallet-election-provider-multi-phase = { path = "substrate/frame/election-provider-multi-phase", default-features = false }
 pallet-election-provider-support-benchmarking = { path = "substrate/frame/election-provider-support/benchmarking", default-features = false }
 pallet-elections-phragmen = { path = "substrate/frame/elections-phragmen", default-features = false }
@@ -997,7 +1000,6 @@ pallet-xcm-benchmarks = { path = "polkadot/xcm/pallet-xcm-benchmarks", default-f
 pallet-xcm-bridge-hub = { path = "bridges/modules/xcm-bridge-hub", default-features = false }
 pallet-xcm-bridge-hub-router = { path = "bridges/modules/xcm-bridge-hub-router", default-features = false }
 parachain-info = { path = "cumulus/parachains/pallets/parachain-info", default-features = false, package = "staging-parachain-info" }
-parachain-template-runtime = { path = "templates/parachain/runtime" }
 parachains-common = { path = "cumulus/parachains/common", default-features = false }
 parachains-relay = { path = "bridges/relays/parachains" }
 parachains-runtimes-test-utils = { path = "cumulus/parachains/runtimes/test-utils", default-features = false }
@@ -1279,6 +1281,8 @@ spinners = { version = "4.1.1" }
 ss58-registry = { version = "1.34.0", default-features = false }
 ssz_rs = { version = "0.9.0", default-features = false }
 ssz_rs_derive = { version = "0.9.0", default-features = false }
+staking-rococo-runtime = { path = "cumulus/parachains/runtimes/staking/staking-rococo" }
+staking-runtime = { path = "templates/parachain/runtime" }
 static_assertions = { version = "1.1.0", default-features = false }
 static_init = { version = "1.0.3" }
 structopt = { version = "0.3" }

cumulus/client/consensus/aura/src/collator.rs

@@ -251,12 +251,26 @@ where
 		{
 			tracing::info!(
 				target: crate::LOG_TARGET,
-				"PoV size {{ header: {}kb, extrinsics: {}kb, storage_proof: {}kb }}",
+				"PoV size {{ header: {}kb, extrinsics: {}kb, storage_proof: {}kb }} (max storage_proof: {}kb)",
 				block_data.header().encode().len() as f64 / 1024f64,
 				block_data.extrinsics().encode().len() as f64 / 1024f64,
 				block_data.storage_proof().encode().len() as f64 / 1024f64,
+				max_pov_size as f64 / 1024f64,
 			);
 
+			// if storage proof > max_pov_size, log and panic as inclusion will not work.
+			if block_data.storage_proof().encode().len() > max_pov_size {
+				tracing::error!(
+					target: crate::LOG_TARGET,
+					"\n\n ⚠️ ⚠️  PoV STORAGE PROOF OVER LIMIT ({:?}kb > {:?}kb, ie. {:?}% overflow)\n",
+					block_data.storage_proof().encode().len() as f64 / 1024f64,
+					max_pov_size as f64 / 1024f64,
+					(block_data.storage_proof().encode().len() * 100 / max_pov_size),
+
+				);
+				panic!("chain bricked due to PoV limits");
+			}
+
 			if let MaybeCompressedPoV::Compressed(ref pov) = collation.proof_of_validity {
 				tracing::info!(
 					target: crate::LOG_TARGET,

cumulus/parachains/runtimes/staking/README.md

@@ -0,0 +1,49 @@
+# Staking Parachain
+
+*Note: the Staking Parachain implementation is still in experimental phase. Both design and
+implementation is fluid and may change at any time. See <https://hackmd.io/okXqe3csRd2Qmo6eXCNQ3Q>
+for more information on the design decisions.*
+
+Implementation of Staking Chain, a blockchain to support staking in the Polkadot and Kusama
+networks.
+
+**Staking Chain allows users to**:
+
+- Teleport DOT from Asset Hub to use as staking funds (native staking).
+- Use reserved DOT asset in Asset Hub as staking funds (remote  staking).
+- Set the intent to become a validator.
+- Set the intent to become a nominator and/or join nomination pools.
+- Stake assets natively and remotely through the Assets Hub.
+
+### Staking Chain and Assets Hub
+
+The Staking Chain provides the following information to the Assets Hub:
+
+- When to mint a new batch of inflation DOT tokens.
+- The previous era durantion and the overall amount of staked DOT.
+
+### Staking Chain and Relay Chain:
+
+The Staking Chain provides the following information to the Relay Chain:
+
+- When a new validator set should be enabled.
+- Which validators should be part of the new validator set.
+- Which active validators should be disabled (due to offence).
+
+The Staking Chain receives the following information from the Relay Chain:
+
+- Reward points for block authors.
+- Validator offences.
+
+Staking Chain must stay fully aligned with the Realy Chain it is connected to. As such, it will
+accept the Relay Chain's governance as its own. In addition, we assume that the Relay Chain trusts
+the Staking Chain, namely when the Stackin Chain:
+
+- Announces a new set active validators.
+- Processes offences and applies slashes.
+- Accounces the staked amount, era duration and transition when calculating the inflation minting.
+
+### Reserving Assets on Staking Chain
+
+System parachains (e.g. governance) may reserve native DOT assets from the Staking Chain to use
+locally.

cumulus/parachains/runtimes/staking/common/Cargo.toml

@@ -0,0 +1,70 @@
+[package]
+name = "staking-common"
+version = "0.1.0"
+authors.workspace = true
+edition.workspace = true
+description = "Staking common utilities"
+license = "Apache-2.0"
+
+[dependencies]
+codec = { package = "parity-scale-codec", version = "3.0.0", default-features = false, features = ["derive"] }
+scale-info = { version = "2.10.0", default-features = false, features = ["derive"] }
+log = { version = "0.4.20", default-features = false }
+impl-trait-for-tuples = "0.2.2"
+
+# Substrate
+frame-support = { path = "../../../../../substrate/frame/support", default-features = false }
+sp-api = { path = "../../../../../substrate/primitives/api", default-features = false }
+sp-std = { path = "../../../../../substrate/primitives/std", default-features = false }
+sp-runtime = { path = "../../../../../substrate/primitives/runtime", default-features = false }
+sp-core = { path = "../../../../../substrate/primitives/core", default-features = false }
+sp-staking = { path = "../../../../../substrate/primitives/staking", default-features = false, features = ["serde"] }
+pallet-staking = { path = "../../../../../substrate/frame/staking", default-features = false }
+pallet-election-provider-multi-block = { path = "../../../../../substrate/frame/election-provider-multi-block", default-features = false }
+
+# Polkadot
+pallet-xcm = { path = "../../../../../polkadot/xcm/pallet-xcm", default-features = false }
+xcm = { package = "staging-xcm", path = "../../../../../polkadot/xcm", default-features = false }
+xcm-builder = { package = "staging-xcm-builder", path = "../../../../../polkadot/xcm/xcm-builder", default-features = false }
+xcm-executor = { package = "staging-xcm-executor", path = "../../../../../polkadot/xcm/xcm-executor", default-features = false }
+
+# Cumulus
+parachains-common = { path = "../../../common", default-features = false }
+cumulus-primitives-core = { path = "../../../../primitives/core", default-features = false }
+
+[build-dependencies]
+substrate-wasm-builder = { path = "../../../../../substrate/utils/wasm-builder" }
+
+[features]
+default = ["std"]
+std = [
+	"codec/std",
+	"cumulus-primitives-core/std",
+	"frame-support/std",
+	"log/std",
+	"pallet-election-provider-multi-block/std",
+	"pallet-staking/std",
+	"pallet-xcm/std",
+	"parachains-common/std",
+	"scale-info/std",
+	"sp-api/std",
+	"sp-core/std",
+	"sp-runtime/std",
+	"sp-staking/std",
+	"sp-std/std",
+	"xcm-builder/std",
+	"xcm-executor/std",
+	"xcm/std",
+]
+
+runtime-benchmarks = [
+	"cumulus-primitives-core/runtime-benchmarks",
+	"frame-support/runtime-benchmarks",
+	"pallet-staking/runtime-benchmarks",
+	"pallet-xcm/runtime-benchmarks",
+	"parachains-common/runtime-benchmarks",
+	"sp-runtime/runtime-benchmarks",
+	"sp-staking/runtime-benchmarks",
+	"xcm-builder/runtime-benchmarks",
+	"xcm-executor/runtime-benchmarks",
+]

cumulus/parachains/runtimes/staking/common/src/lib.rs

@@ -0,0 +1,53 @@
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+use frame_support::traits::ConstU32;
+use parachains_common::Balance;
+
+/// The type used for currency conversion.
+///
+/// This must only be used as long as the balance type is `u128`.
+pub type CurrencyToVote = sp_staking::currency_to_vote::U128CurrencyToVote;
+
+pub type VoterIndex = u32;
+pub type TargetIndex = u16;
+
+/// Convert a balance to an unsigned 256-bit number, use in nomination pools.
+pub struct BalanceToU256;
+impl sp_runtime::traits::Convert<Balance, sp_core::U256> for BalanceToU256 {
+	fn convert(n: Balance) -> sp_core::U256 {
+		n.into()
+	}
+}
+
+/// Convert an unsigned 256-bit number to balance, use in nomination pools.
+pub struct U256ToBalance;
+impl sp_runtime::traits::Convert<sp_core::U256, Balance> for U256ToBalance {
+	fn convert(n: sp_core::U256) -> Balance {
+		use frame_support::traits::Defensive;
+		n.try_into().defensive_unwrap_or(Balance::MAX)
+	}
+}
+
+/// A reasonable benchmarking config for staking pallet.
+pub struct StakingBenchmarkingConfig;
+impl pallet_staking::BenchmarkingConfig for StakingBenchmarkingConfig {
+	type MaxValidators = ConstU32<1000>;
+	type MaxNominators = ConstU32<1000>;
+}
+
+pub type OnChainAccuracy = sp_runtime::Perbill;