[testnet] Add AssetHubRococo <-> AssetHubWestend asset bridging support (#1967)

## Summary

Asset bridging support for AssetHub**Rococo** <-> AssetHub**Wococo** was
added [here](https://github.com/paritytech/polkadot-sdk/pull/1215), so
now we aim to bridge AssetHub**Rococo** and AssetHub**Westend**. (And
perhaps retire AssetHubWococo and the Wococo chains).

## Solution

**bridge-hub-westend-runtime**
- added new runtime as a copy of `bridge-hub-rococo-runtime`
- added support for bridging to `BridgeHubRococo`
- added tests and benchmarks

**bridge-hub-rococo-runtime**
- added support for bridging to `BridgeHubWestend`
- added tests and benchmarks
- internal refactoring by splitting bridge configuration per network,
e.g., `bridge_to_whatevernetwork_config.rs`.

**asset-hub-rococo-runtime**
- added support for asset bridging to `AssetHubWestend` (allows to
receive only WNDs)
- added new xcm router for `Westend`
- added tests and benchmarks

**asset-hub-westend-runtime**
- added support for asset bridging to `AssetHubRococo` (allows to
receive only ROCs)
- added new xcm router for `Rococo`
- added tests and benchmarks

## Deployment

All changes will be deployed as a part of
https://github.com/paritytech/polkadot-sdk/issues/1988.

## TODO

- [x] benchmarks for all pallet instances
- [x] integration tests
- [x] local run scripts


Relates to:
https://github.com/paritytech/parity-bridges-common/issues/2602
Relates to: https://github.com/paritytech/polkadot-sdk/issues/1988

---------

Co-authored-by: command-bot <>
Co-authored-by: Adrian Catangiu <adrian@parity.io>
Co-authored-by: joe petrowski <25483142+joepetrowski@users.noreply.github.com>

cumulus/polkadot-parachain/Cargo.toml

@@ -35,6 +35,7 @@ contracts-rococo-runtime = { path = "../parachains/runtimes/contracts/contracts-
 bridge-hub-rococo-runtime = { path = "../parachains/runtimes/bridge-hubs/bridge-hub-rococo" }
 bridge-hub-kusama-runtime = { path = "../parachains/runtimes/bridge-hubs/bridge-hub-kusama" }
 bridge-hub-polkadot-runtime = { path = "../parachains/runtimes/bridge-hubs/bridge-hub-polkadot" }
+bridge-hub-westend-runtime = { path = "../parachains/runtimes/bridge-hubs/bridge-hub-westend" }
 penpal-runtime = { path = "../parachains/runtimes/testing/penpal" }
 jsonrpsee = { version = "0.16.2", features = ["server"] }
 parachains-common = { path = "../parachains/common" }
@@ -115,6 +116,7 @@ runtime-benchmarks = [
 	"bridge-hub-kusama-runtime/runtime-benchmarks",
 	"bridge-hub-polkadot-runtime/runtime-benchmarks",
 	"bridge-hub-rococo-runtime/runtime-benchmarks",
+	"bridge-hub-westend-runtime/runtime-benchmarks",
 	"collectives-polkadot-runtime/runtime-benchmarks",
 	"contracts-rococo-runtime/runtime-benchmarks",
 	"frame-benchmarking-cli/runtime-benchmarks",
@@ -137,6 +139,7 @@ try-runtime = [
 	"bridge-hub-kusama-runtime/try-runtime",
 	"bridge-hub-polkadot-runtime/try-runtime",
 	"bridge-hub-rococo-runtime/try-runtime",
+	"bridge-hub-westend-runtime/try-runtime",
 	"collectives-polkadot-runtime/try-runtime",
 	"contracts-rococo-runtime/try-runtime",
 	"glutton-runtime/try-runtime",

cumulus/polkadot-parachain/src/chain_spec/bridge_hubs.rs

@@ -42,8 +42,10 @@ pub enum BridgeHubRuntimeType {
 	// used by benchmarks
 	PolkadotDevelopment,
 
-	// used with kusama runtime
 	Westend,
+	WestendLocal,
+	// used by benchmarks
+	WestendDevelopment,
 }
 
 impl FromStr for BridgeHubRuntimeType {
@@ -59,6 +61,8 @@ impl FromStr for BridgeHubRuntimeType {
 			kusama::BRIDGE_HUB_KUSAMA_LOCAL => Ok(BridgeHubRuntimeType::KusamaLocal),
 			kusama::BRIDGE_HUB_KUSAMA_DEVELOPMENT => Ok(BridgeHubRuntimeType::KusamaDevelopment),
 			westend::BRIDGE_HUB_WESTEND => Ok(BridgeHubRuntimeType::Westend),
+			westend::BRIDGE_HUB_WESTEND_LOCAL => Ok(BridgeHubRuntimeType::WestendLocal),
+			westend::BRIDGE_HUB_WESTEND_DEVELOPMENT => Ok(BridgeHubRuntimeType::WestendDevelopment),
 			rococo::BRIDGE_HUB_ROCOCO => Ok(BridgeHubRuntimeType::Rococo),
 			rococo::BRIDGE_HUB_ROCOCO_LOCAL => Ok(BridgeHubRuntimeType::RococoLocal),
 			rococo::BRIDGE_HUB_ROCOCO_DEVELOPMENT => Ok(BridgeHubRuntimeType::RococoDevelopment),
@@ -82,7 +86,9 @@ impl BridgeHubRuntimeType {
 			BridgeHubRuntimeType::KusamaLocal |
 			BridgeHubRuntimeType::KusamaDevelopment =>
 				Ok(Box::new(kusama::BridgeHubChainSpec::from_json_file(path)?)),
-			BridgeHubRuntimeType::Westend =>
+			BridgeHubRuntimeType::Westend |
+			BridgeHubRuntimeType::WestendLocal |
+			BridgeHubRuntimeType::WestendDevelopment =>
 				Ok(Box::new(westend::BridgeHubChainSpec::from_json_file(path)?)),
 			BridgeHubRuntimeType::Rococo |
 			BridgeHubRuntimeType::RococoLocal |
@@ -131,6 +137,20 @@ impl BridgeHubRuntimeType {
 				Ok(Box::new(westend::BridgeHubChainSpec::from_json_bytes(
 					&include_bytes!("../../chain-specs/bridge-hub-westend.json")[..],
 				)?)),
+			BridgeHubRuntimeType::WestendLocal => Ok(Box::new(westend::local_config(
+				westend::BRIDGE_HUB_WESTEND_LOCAL,
+				"Westend BridgeHub Local",
+				"westend-local",
+				ParaId::new(1002),
+				Some("Bob".to_string()),
+			))),
+			BridgeHubRuntimeType::WestendDevelopment => Ok(Box::new(westend::local_config(
+				westend::BRIDGE_HUB_WESTEND_DEVELOPMENT,
+				"Westend BridgeHub Development",
+				"westend-dev",
+				ParaId::new(1002),
+				Some("Bob".to_string()),
+			))),
 			BridgeHubRuntimeType::Rococo =>
 				Ok(Box::new(rococo::BridgeHubChainSpec::from_json_bytes(
 					&include_bytes!("../../chain-specs/bridge-hub-rococo.json")[..],
@@ -311,20 +331,26 @@ pub mod rococo {
 				owner: bridges_pallet_owner.clone(),
 				..Default::default()
 			},
+			bridge_westend_grandpa: bridge_hub_rococo_runtime::BridgeWestendGrandpaConfig {
+				owner: bridges_pallet_owner.clone(),
+				..Default::default()
+			},
 			bridge_rococo_grandpa: bridge_hub_rococo_runtime::BridgeRococoGrandpaConfig {
 				owner: bridges_pallet_owner.clone(),
 				..Default::default()
 			},
-			bridge_wococo_to_rococo_messages:
-				bridge_hub_rococo_runtime::BridgeWococoToRococoMessagesConfig {
-					owner: bridges_pallet_owner.clone(),
-					..Default::default()
-				},
-			bridge_rococo_to_wococo_messages:
-				bridge_hub_rococo_runtime::BridgeRococoToWococoMessagesConfig {
-					owner: bridges_pallet_owner,
-					..Default::default()
-				},
+			bridge_rococo_messages: bridge_hub_rococo_runtime::BridgeRococoMessagesConfig {
+				owner: bridges_pallet_owner.clone(),
+				..Default::default()
+			},
+			bridge_wococo_messages: bridge_hub_rococo_runtime::BridgeWococoMessagesConfig {
+				owner: bridges_pallet_owner.clone(),
+				..Default::default()
+			},
+			bridge_westend_messages: bridge_hub_rococo_runtime::BridgeWestendMessagesConfig {
+				owner: bridges_pallet_owner.clone(),
+				..Default::default()
+			},
 		}
 	}
 }
@@ -488,13 +514,139 @@ pub mod kusama {
 	}
 }
 
-/// Sub-module for Westend setup (uses Kusama runtime)
+/// Sub-module for Westend setup.
 pub mod westend {
-	use crate::chain_spec::bridge_hubs::kusama;
+	use super::{get_account_id_from_seed, get_collator_keys_from_seed, sr25519, ParaId};
+	use crate::chain_spec::{Extensions, SAFE_XCM_VERSION};
+	use parachains_common::{AccountId, AuraId};
+	use sc_chain_spec::ChainType;
+
+	use super::BridgeHubBalance;
 
 	pub(crate) const BRIDGE_HUB_WESTEND: &str = "bridge-hub-westend";
-	pub type BridgeHubChainSpec = kusama::BridgeHubChainSpec;
-	pub type RuntimeApi = bridge_hub_kusama_runtime::RuntimeApi;
+	pub(crate) const BRIDGE_HUB_WESTEND_LOCAL: &str = "bridge-hub-westend-local";
+	pub(crate) const BRIDGE_HUB_WESTEND_DEVELOPMENT: &str = "bridge-hub-westend-dev";
+	const BRIDGE_HUB_WESTEND_ED: BridgeHubBalance =
+		parachains_common::westend::currency::EXISTENTIAL_DEPOSIT;
+
+	/// Specialized `ChainSpec` for the normal parachain runtime.
+	pub type BridgeHubChainSpec =
+		sc_service::GenericChainSpec<bridge_hub_westend_runtime::RuntimeGenesisConfig, Extensions>;
+	pub type RuntimeApi = bridge_hub_westend_runtime::RuntimeApi;
+
+	pub fn local_config(
+		id: &str,
+		chain_name: &str,
+		relay_chain: &str,
+		para_id: ParaId,
+		bridges_pallet_owner_seed: Option<String>,
+	) -> BridgeHubChainSpec {
+		let mut properties = sc_chain_spec::Properties::new();
+		properties.insert("tokenSymbol".into(), "WND".into());
+		properties.insert("tokenDecimals".into(), 12.into());
+
+		BridgeHubChainSpec::from_genesis(
+			// Name
+			chain_name,
+			// ID
+			super::ensure_id(id).expect("invalid id"),
+			ChainType::Local,
+			move || {
+				genesis(
+					// initial collators.
+					vec![
+						(
+							get_account_id_from_seed::<sr25519::Public>("Alice"),
+							get_collator_keys_from_seed::<AuraId>("Alice"),
+						),
+						(
+							get_account_id_from_seed::<sr25519::Public>("Bob"),
+							get_collator_keys_from_seed::<AuraId>("Bob"),
+						),
+					],
+					vec![
+						get_account_id_from_seed::<sr25519::Public>("Alice"),
+						get_account_id_from_seed::<sr25519::Public>("Bob"),
+						get_account_id_from_seed::<sr25519::Public>("Charlie"),
+						get_account_id_from_seed::<sr25519::Public>("Dave"),
+						get_account_id_from_seed::<sr25519::Public>("Eve"),
+						get_account_id_from_seed::<sr25519::Public>("Ferdie"),
+						get_account_id_from_seed::<sr25519::Public>("Alice//stash"),
+						get_account_id_from_seed::<sr25519::Public>("Bob//stash"),
+						get_account_id_from_seed::<sr25519::Public>("Charlie//stash"),
+						get_account_id_from_seed::<sr25519::Public>("Dave//stash"),
+						get_account_id_from_seed::<sr25519::Public>("Eve//stash"),
+						get_account_id_from_seed::<sr25519::Public>("Ferdie//stash"),
+					],
+					para_id,
+					bridges_pallet_owner_seed
+						.as_ref()
+						.map(|seed| get_account_id_from_seed::<sr25519::Public>(seed)),
+				)
+			},
+			Vec::new(),
+			None,
+			None,
+			None,
+			Some(properties),
+			Extensions { relay_chain: relay_chain.to_string(), para_id: para_id.into() },
+		)
+	}
+
+	fn genesis(
+		invulnerables: Vec<(AccountId, AuraId)>,
+		endowed_accounts: Vec<AccountId>,
+		id: ParaId,
+		bridges_pallet_owner: Option<AccountId>,
+	) -> bridge_hub_westend_runtime::RuntimeGenesisConfig {
+		bridge_hub_westend_runtime::RuntimeGenesisConfig {
+			system: bridge_hub_westend_runtime::SystemConfig {
+				code: bridge_hub_westend_runtime::WASM_BINARY
+					.expect("WASM binary was not build, please build it!")
+					.to_vec(),
+				..Default::default()
+			},
+			balances: bridge_hub_westend_runtime::BalancesConfig {
+				balances: endowed_accounts.iter().cloned().map(|k| (k, 1 << 60)).collect(),
+			},
+			parachain_info: bridge_hub_westend_runtime::ParachainInfoConfig {
+				parachain_id: id,
+				..Default::default()
+			},
+			collator_selection: bridge_hub_westend_runtime::CollatorSelectionConfig {
+				invulnerables: invulnerables.iter().cloned().map(|(acc, _)| acc).collect(),
+				candidacy_bond: BRIDGE_HUB_WESTEND_ED * 16,
+				..Default::default()
+			},
+			session: bridge_hub_westend_runtime::SessionConfig {
+				keys: invulnerables
+					.into_iter()
+					.map(|(acc, aura)| {
+						(
+							acc.clone(),                                      // account id
+							acc,                                              // validator id
+							bridge_hub_westend_runtime::SessionKeys { aura }, // session keys
+						)
+					})
+					.collect(),
+			},
+			aura: Default::default(),
+			aura_ext: Default::default(),
+			parachain_system: Default::default(),
+			polkadot_xcm: bridge_hub_westend_runtime::PolkadotXcmConfig {
+				safe_xcm_version: Some(SAFE_XCM_VERSION),
+				..Default::default()
+			},
+			bridge_rococo_grandpa: bridge_hub_westend_runtime::BridgeRococoGrandpaConfig {
+				owner: bridges_pallet_owner.clone(),
+				..Default::default()
+			},
+			bridge_rococo_messages: bridge_hub_westend_runtime::BridgeRococoMessagesConfig {
+				owner: bridges_pallet_owner.clone(),
+				..Default::default()
+			},
+		}
+	}
 }
 
 /// Sub-module for Polkadot setup

cumulus/polkadot-parachain/src/command.rs

@@ -467,7 +467,9 @@ macro_rules! construct_partials {
 					)?;
 					$code
 				},
-				chain_spec::bridge_hubs::BridgeHubRuntimeType::Westend => {
+				chain_spec::bridge_hubs::BridgeHubRuntimeType::Westend |
+				chain_spec::bridge_hubs::BridgeHubRuntimeType::WestendLocal |
+				chain_spec::bridge_hubs::BridgeHubRuntimeType::WestendDevelopment => {
 					let $partials = new_partial::<chain_spec::bridge_hubs::westend::RuntimeApi, _>(
 						&$config,
 						crate::service::aura_build_import_queue::<_, AuraId>,
@@ -650,7 +652,9 @@ macro_rules! construct_async_run {
 							{ $( $code )* }.map(|v| (v, task_manager))
 						})
 					},
-					chain_spec::bridge_hubs::BridgeHubRuntimeType::Westend => {
+					chain_spec::bridge_hubs::BridgeHubRuntimeType::Westend |
+					chain_spec::bridge_hubs::BridgeHubRuntimeType::WestendLocal |
+					chain_spec::bridge_hubs::BridgeHubRuntimeType::WestendDevelopment => {
 						runner.async_run(|$config| {
 							let $components = new_partial::<chain_spec::bridge_hubs::westend::RuntimeApi, _>(
 								&$config,
@@ -976,7 +980,9 @@ pub fn run() -> Result<()> {
 							>(config, polkadot_config, collator_options, id, hwbench)
 							.await
 							.map(|r| r.0),
-						chain_spec::bridge_hubs::BridgeHubRuntimeType::Westend =>
+						chain_spec::bridge_hubs::BridgeHubRuntimeType::Westend |
+						chain_spec::bridge_hubs::BridgeHubRuntimeType::WestendLocal |
+						chain_spec::bridge_hubs::BridgeHubRuntimeType::WestendDevelopment =>
 							crate::service::start_generic_aura_node::<
 								chain_spec::bridge_hubs::westend::RuntimeApi,
 								AuraId,