Add Bridge Header Sync to Rococo Runtime (#2983)

* Add bridges code to workspace

* Add Rococo and Wococo bridge instances to Rococo runtime

* Add Rococo and Wococo runtime APIs

* Add GenesisConfig parameters for bridge pallet

* Update Rococo spec_version used by bridge relayer

* Add scripts for running Rococo and Wococo dev nodes

* Add scripts for running Rococo<>Wococo header sync

* Apply patch for build artifact location

* Remove bridges crates from workspace

* Downgrade async related dependencies

* Change bridge pallet owner to be `root_key`

* Bump number of `MaxRequests` allowed

* Revert changes in `bridges` subtree folder

* Use correct account for Sudo

* Add comment explaining duplicate bridge pallets

* Remove WeightInfo comment.

Co-authored-by: Tomasz Drwięga <tomasz@parity.io>

polkadot/Cargo.lock

@@ -704,17 +704,6 @@ dependencies = [
  "sp-std",
 ]
 
-[[package]]
-name = "bp-kusama"
-version = "0.1.0"
-dependencies = [
- "bp-messages",
- "bp-polkadot-core",
- "bp-runtime",
- "sp-api",
- "sp-std",
-]
-
 [[package]]
 name = "bp-messages"
 version = "0.1.0"
@@ -726,17 +715,6 @@ dependencies = [
  "sp-std",
 ]
 
-[[package]]
-name = "bp-polkadot"
-version = "0.1.0"
-dependencies = [
- "bp-messages",
- "bp-polkadot-core",
- "bp-runtime",
- "sp-api",
- "sp-std",
-]
-
 [[package]]
 name = "bp-polkadot-core"
 version = "0.1.0"
@@ -800,7 +778,7 @@ dependencies = [
 ]
 
 [[package]]
-name = "bp-westend"
+name = "bp-wococo"
 version = "0.1.0"
 dependencies = [
  "bp-header-chain",
@@ -4561,6 +4539,28 @@ dependencies = [
  "sp-std",
 ]
 
+[[package]]
+name = "pallet-bridge-grandpa"
+version = "0.1.0"
+dependencies = [
+ "bp-header-chain",
+ "bp-runtime",
+ "bp-test-utils",
+ "finality-grandpa",
+ "frame-benchmarking",
+ "frame-support",
+ "frame-system",
+ "log",
+ "num-traits",
+ "parity-scale-codec",
+ "serde",
+ "sp-finality-grandpa",
+ "sp-io",
+ "sp-runtime",
+ "sp-std",
+ "sp-trie",
+]
+
 [[package]]
 name = "pallet-collective"
 version = "3.0.0"
@@ -7417,6 +7417,8 @@ name = "rococo-runtime"
 version = "0.9.1"
 dependencies = [
  "beefy-primitives",
+ "bp-rococo",
+ "bp-wococo",
  "frame-executive",
  "frame-support",
  "frame-system",
@@ -7428,6 +7430,7 @@ dependencies = [
  "pallet-babe",
  "pallet-balances",
  "pallet-beefy",
+ "pallet-bridge-grandpa",
  "pallet-collective",
  "pallet-grandpa",
  "pallet-im-online",

polkadot/Cargo.toml

@@ -26,11 +26,6 @@ tempfile = "3.2.0"
 
 [workspace]
 members = [
-	"bridges/primitives/chain-kusama",
-	"bridges/primitives/chain-polkadot",
-	"bridges/primitives/chain-rococo",
-	"bridges/primitives/chain-westend",
-	"bridges/primitives/runtime",
 	"cli",
 	"core-primitives",
 	"erasure-coding",

polkadot/node/service/src/chain_spec.rs

@@ -923,6 +923,14 @@ fn rococo_staging_testnet_config_genesis(wasm_binary: &[u8]) -> rococo_runtime::
 				..Default::default()
 			},
 		},
+		pallet_bridge_grandpa: rococo_runtime::BridgeRococoGrandpaConfig {
+			owner: Some(endowed_accounts[0].clone()),
+			..Default::default()
+		},
+		pallet_bridge_grandpa_Instance1: rococo_runtime::BridgeWococoGrandpaConfig {
+			owner: Some(endowed_accounts[0].clone()),
+			..Default::default()
+		},
 	}
 }
 
@@ -1431,7 +1439,7 @@ pub fn rococo_testnet_genesis(
 		pallet_authority_discovery: rococo_runtime::AuthorityDiscoveryConfig {
 			keys: vec![],
 		},
-		pallet_sudo: rococo_runtime::SudoConfig { key: root_key },
+		pallet_sudo: rococo_runtime::SudoConfig { key: root_key.clone() },
 		parachains_configuration: rococo_runtime::ParachainsConfigurationConfig {
 			config: polkadot_runtime_parachains::configuration::HostConfiguration {
 				validation_upgrade_frequency: 600u32,
@@ -1479,6 +1487,14 @@ pub fn rococo_testnet_genesis(
 			paras: vec![],
 		    _phdata: Default::default(),
 		},
+		pallet_bridge_grandpa: rococo_runtime::BridgeRococoGrandpaConfig {
+			owner: Some(root_key.clone()),
+			..Default::default()
+		},
+		pallet_bridge_grandpa_Instance1: rococo_runtime::BridgeWococoGrandpaConfig {
+			owner: Some(root_key.clone()),
+			..Default::default()
+		},
 	}
 }
 

polkadot/runtime/rococo/Cargo.toml

@@ -68,6 +68,11 @@ xcm-executor = { package = "xcm-executor", path = "../../xcm/xcm-executor", defa
 xcm-builder = { package = "xcm-builder", path = "../../xcm/xcm-builder", default-features = false }
 pallet-xcm = { path = "../../xcm/pallet-xcm", default-features = false }
 
+# Bridge Dependencies
+bp-rococo = { path = "../../bridges/primitives/chain-rococo", default-features = false }
+bp-wococo = { path = "../../bridges/primitives/chain-wococo", default-features = false }
+pallet-bridge-grandpa = { path = "../../bridges/modules/grandpa", default-features = false }
+
 [build-dependencies]
 substrate-wasm-builder = "3.0.0"
 
@@ -77,6 +82,8 @@ no_std = []
 std = [
 	"authority-discovery-primitives/std",
 	"babe-primitives/std",
+	"bp-rococo/std",
+	"bp-wococo/std",
 	"parity-scale-codec/std",
 	"frame-executive/std",
 	"pallet-authority-discovery/std",
@@ -84,6 +91,7 @@ std = [
 	"pallet-babe/std",
 	"beefy-primitives/std",
 	"pallet-balances/std",
+	"pallet-bridge-grandpa/std",
 	"pallet-collective/std",
 	"pallet-beefy/std",
 	"pallet-grandpa/std",

polkadot/runtime/rococo/src/lib.rs

@@ -236,6 +236,12 @@ construct_runtime! {
 		Beefy: pallet_beefy::{Pallet, Config<T>, Storage},
 		MmrLeaf: mmr_common::{Pallet, Storage},
 
+		// It might seem strange that we add both sides of the bridge to the same runtime. We do this because this
+		// runtime as shared by both the Rococo and Wococo chains. When running as Rococo we only use
+		// `BridgeWococoGrandpa`, and vice versa.
+		BridgeRococoGrandpa: pallet_bridge_grandpa::{Pallet, Call, Storage, Config<T>} = 40,
+		BridgeWococoGrandpa: pallet_bridge_grandpa::<Instance1>::{Pallet, Call, Storage, Config<T>} = 41,
+
 		// Validator Manager pallet.
 		ValidatorManager: validator_manager::{Pallet, Call, Storage, Event<T>},
 
@@ -794,6 +800,38 @@ impl mmr_common::Config for Runtime {
 	type ParachainHeads = Paras;
 }
 
+parameter_types! {
+	// This is a pretty unscientific cap.
+	//
+	// Note that once this is hit the pallet will essentially throttle incoming requests down to one
+	// call per block.
+	pub const MaxRequests: u32 = 4 * HOURS as u32;
+
+	// Number of headers to keep.
+	//
+	// Assuming the worst case of every header being finalized, we will keep headers at least for a
+	// week.
+	pub const HeadersToKeep: u32 = 7 * DAYS as u32;
+}
+
+pub type RococoGrandpaInstance = ();
+impl pallet_bridge_grandpa::Config for Runtime {
+	type BridgedChain = bp_rococo::Rococo;
+	type MaxRequests = MaxRequests;
+	type HeadersToKeep = HeadersToKeep;
+
+	type WeightInfo = pallet_bridge_grandpa::weights::RialtoWeight<Runtime>;
+}
+
+pub type WococoGrandpaInstance = pallet_bridge_grandpa::Instance1;
+impl pallet_bridge_grandpa::Config<WococoGrandpaInstance> for Runtime {
+	type BridgedChain = bp_wococo::Wococo;
+	type MaxRequests = MaxRequests;
+	type HeadersToKeep = HeadersToKeep;
+
+	type WeightInfo = pallet_bridge_grandpa::weights::RialtoWeight<Runtime>;
+}
+
 impl Randomness<Hash, BlockNumber> for ParentHashRandomness {
 	fn random(subject: &[u8]) -> (Hash, BlockNumber) {
 		(
@@ -1222,6 +1260,28 @@ sp_api::impl_runtime_apis! {
 		}
 	}
 
+	impl bp_rococo::RococoFinalityApi<Block> for Runtime {
+		fn best_finalized() -> (bp_rococo::BlockNumber, bp_rococo::Hash) {
+			let header = BridgeRococoGrandpa::best_finalized();
+			(header.number, header.hash())
+		}
+
+		fn is_known_header(hash: bp_rococo::Hash) -> bool {
+			BridgeRococoGrandpa::is_known_header(hash)
+		}
+	}
+
+	impl bp_wococo::WococoFinalityApi<Block> for Runtime {
+		fn best_finalized() -> (bp_wococo::BlockNumber, bp_wococo::Hash) {
+			let header = BridgeWococoGrandpa::best_finalized();
+			(header.number, header.hash())
+		}
+
+		fn is_known_header(hash: bp_wococo::Hash) -> bool {
+			BridgeWococoGrandpa::is_known_header(hash)
+		}
+	}
+
 	impl frame_system_rpc_runtime_api::AccountNonceApi<Block, AccountId, Nonce> for Runtime {
 		fn account_nonce(account: AccountId) -> Nonce {
 			System::account_nonce(account)