fix bridge hubs blocks interval (#1836)

Author: svyatonik

bridges/primitives/chain-bridge-hub-cumulus/Cargo.toml

@@ -17,6 +17,7 @@ bp-messages = { path = "../../primitives/messages", default-features = false }
 frame-system = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 frame-support = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-api = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
+sp-std = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 
 # Polkadot Dependencies
 polkadot-primitives = { git = "https://github.com/paritytech/polkadot", branch = "master", default-features = false }
@@ -29,5 +30,6 @@ std = [
 	"frame-system/std",
 	"frame-support/std",
 	"sp-api/std",
+	"sp-std/std",
 	"polkadot-primitives/std",
 ]

bridges/primitives/chain-bridge-hub-cumulus/src/lib.rs

@@ -29,6 +29,12 @@ use frame_support::{
 	weights::constants,
 };
 use frame_system::limits;
+use sp_std::time::Duration;
+
+/// Average block interval in Cumulus-based parachains.
+///
+/// Corresponds to the `MILLISECS_PER_BLOCK` from `parachains_common` crate.
+pub const AVERAGE_BLOCK_INTERVAL: Duration = Duration::from_secs(12);
 
 /// All cumulus bridge hubs allow normal extrinsics to fill block up to 75 percent.
 ///

bridges/relays/client-bridge-hub-rococo/src/lib.rs

@@ -16,6 +16,7 @@
 
 //! Types used to connect to the BridgeHub-Rococo-Substrate parachain.
 
+use bp_bridge_hub_rococo::AVERAGE_BLOCK_INTERVAL;
 use bp_bridge_hub_wococo::PolkadotSignedExtension;
 use bp_messages::MessageNonce;
 use codec::Encode;
@@ -44,7 +45,7 @@ impl Chain for BridgeHubRococo {
 	const TOKEN_ID: Option<&'static str> = None;
 	const BEST_FINALIZED_HEADER_ID_METHOD: &'static str =
 		bp_bridge_hub_rococo::BEST_FINALIZED_BRIDGE_HUB_ROCOCO_HEADER_METHOD;
-	const AVERAGE_BLOCK_INTERVAL: Duration = Duration::from_secs(6);
+	const AVERAGE_BLOCK_INTERVAL: Duration = AVERAGE_BLOCK_INTERVAL;
 
 	type SignedBlock = bp_bridge_hub_rococo::SignedBlock;
 	type Call = runtime::Call;

bridges/relays/client-bridge-hub-wococo/src/lib.rs

@@ -16,7 +16,7 @@
 
 //! Types used to connect to the BridgeHub-Wococo-Substrate parachain.
 
-use bp_bridge_hub_wococo::PolkadotSignedExtension;
+use bp_bridge_hub_wococo::{PolkadotSignedExtension, AVERAGE_BLOCK_INTERVAL};
 use bp_messages::MessageNonce;
 use codec::Encode;
 use relay_substrate_client::{
@@ -44,7 +44,7 @@ impl Chain for BridgeHubWococo {
 	const TOKEN_ID: Option<&'static str> = None;
 	const BEST_FINALIZED_HEADER_ID_METHOD: &'static str =
 		bp_bridge_hub_wococo::BEST_FINALIZED_BRIDGE_HUB_WOCOCO_HEADER_METHOD;
-	const AVERAGE_BLOCK_INTERVAL: Duration = Duration::from_secs(6);
+	const AVERAGE_BLOCK_INTERVAL: Duration = AVERAGE_BLOCK_INTERVAL;
 
 	type SignedBlock = bp_bridge_hub_wococo::SignedBlock;
 	type Call = runtime::Call;