Add Transaction Fee RPC to Statemint/Statemine

Cargo.toml

@@ -24,7 +24,7 @@ members = [
 	"polkadot-parachains/pallets/ping",
 	"polkadot-parachains/rococo",
 	"polkadot-parachains/shell",
-	"polkadot-parachains/statemint-common",
+	"polkadot-parachains/parachains-common",
 	"polkadot-parachains/statemint",
 	"polkadot-parachains/statemine",
 	"polkadot-parachains/westmint",

polkadot-parachains/Cargo.toml

@@ -28,7 +28,7 @@ shell-runtime = { path = "shell" }
 statemint-runtime = { path = "statemint" }
 statemine-runtime = { path = "statemine" }
 westmint-runtime = { path = "westmint" }
-statemint-common = { path = "statemint-common" }
+parachains-common = { path = "parachains-common" }
 
 # Substrate dependencies
 frame-benchmarking = { git = 'https://github.com/paritytech/substrate', branch = "master" }
@@ -64,6 +64,9 @@ substrate-prometheus-endpoint = { git = "https://github.com/paritytech/substrate
 
 # RPC related dependencies
 jsonrpc-core = "15.1.0"
+sc-transaction-pool-api = { git = "https://github.com/paritytech/substrate", branch = "master" }
+frame-rpc-system = { package = "substrate-frame-rpc-system", git = "https://github.com/paritytech/substrate", branch = "master" }
+pallet-transaction-payment-rpc = { git = "https://github.com/paritytech/substrate", branch = "master" }
 
 # Cumulus dependencies
 cumulus-client-cli = { path = "../client/cli" }

polkadot-parachains/statemint-common/Cargo.toml → polkadot-parachains/parachains-common/Cargo.toml

@@ -1,9 +1,9 @@
 [package]
-name = "statemint-common"
+name = "parachains-common"
 version = "1.0.0"
 authors = ["Parity Technologies <[email protected]>"]
 edition = "2018"
-description = "Logic which is common to all Statemint variant runtimes"
+description = "Logic which is common to all parachain runtimes"
 
 [package.metadata.docs.rs]
 targets = ['x86_64-unknown-linux-gnu']

polkadot-parachains/statemint-common/src/impls.rs → polkadot-parachains/parachains-common/src/impls.rs

@@ -13,12 +13,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//! Auxillary struct/enums for Statemint runtime.
-//! Taken from polkadot/runtime/common (at a21cd64) and adapted for Statemint.
+//! Auxillary struct/enums for parachain runtimes.
+//! Taken from polkadot/runtime/common (at a21cd64) and adapted for parachains.
 
 use frame_support::traits::{Currency, Imbalance, OnUnbalanced};
 
-pub type NegativeImbalance<T> = <pallet_balances::Pallet<T> as Currency<<T as frame_system::Config>::AccountId>>::NegativeImbalance;
+pub type NegativeImbalance<T> = <pallet_balances::Pallet<T> as Currency<
+	<T as frame_system::Config>::AccountId,
+>>::NegativeImbalance;
 
 /// Logic for the author to get a portion of fees.
 pub struct ToStakingPot<R>(sp_std::marker::PhantomData<R>);
@@ -32,10 +34,7 @@ where
 	fn on_nonzero_unbalanced(amount: NegativeImbalance<R>) {
 		let numeric_amount = amount.peek();
 		let staking_pot = <pallet_collator_selection::Pallet<R>>::account_id();
-		<pallet_balances::Pallet<R>>::resolve_creating(
-			&staking_pot,
-			amount,
-		);
+		<pallet_balances::Pallet<R>>::resolve_creating(&staking_pot, amount);
 		<frame_system::Pallet<R>>::deposit_event(pallet_balances::Event::Deposit(
 			staking_pot,
 			numeric_amount,
@@ -64,17 +63,20 @@ where
 #[cfg(test)]
 mod tests {
 	use super::*;
-	use frame_support::traits::FindAuthor;
-	use frame_support::{parameter_types, PalletId, traits::ValidatorRegistration};
+	use frame_support::{
+		parameter_types,
+		traits::{FindAuthor, ValidatorRegistration},
+		PalletId,
+	};
 	use frame_system::{limits, EnsureRoot};
+	use pallet_collator_selection::IdentityCollator;
 	use polkadot_primitives::v1::AccountId;
 	use sp_core::H256;
 	use sp_runtime::{
 		testing::Header,
 		traits::{BlakeTwo256, IdentityLookup},
 		Perbill,
 	};
-	use pallet_collator_selection::IdentityCollator;
 
 	type UncheckedExtrinsic = frame_system::mocking::MockUncheckedExtrinsic<Test>;
 	type Block = frame_system::mocking::MockBlock<Test>;

polkadot-parachains/statemint-common/src/lib.rs → polkadot-parachains/parachains-common/src/lib.rs

@@ -16,12 +16,12 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
 pub mod impls;
-pub use types::*;
 pub use constants::*;
-
-/// Common types of statemint and statemine.
+pub use opaque::*;
+pub use types::*;
+/// Common types of parachains.
 mod types {
-	use sp_runtime::traits::{Verify, IdentifyAccount, BlakeTwo256};
+	use sp_runtime::traits::{IdentifyAccount, Verify};
 
 	/// An index to a block.
 	pub type BlockNumber = u32;
@@ -46,21 +46,18 @@ mod types {
 	/// A hash of some data used by the chain.
 	pub type Hash = sp_core::H256;
 
-	/// Block header type as expected by this runtime.
-	pub type Header = sp_runtime::generic::Header<BlockNumber, BlakeTwo256>;
-
 	/// Digest item type.
 	pub type DigestItem = sp_runtime::generic::DigestItem<Hash>;
-	
+
 	// Aura consensus authority.
 	pub type AuraId = sp_consensus_aura::sr25519::AuthorityId;
 }
 
-/// Common constants of statemint and statemine
+/// Common constants of parachains.
 mod constants {
 	use super::types::BlockNumber;
+	use frame_support::weights::{constants::WEIGHT_PER_SECOND, Weight};
 	use sp_runtime::Perbill;
-	use frame_support::weights::{Weight, constants::WEIGHT_PER_SECOND};
 	/// This determines the average expected block time that we are targeting. Blocks will be
 	/// produced at a minimum duration defined by `SLOT_DURATION`. `SLOT_DURATION` is picked up by
 	/// `pallet_timestamp` which is in turn picked up by `pallet_aura` to implement `fn
@@ -85,3 +82,20 @@ mod constants {
 	/// We allow for 0.5 seconds of compute with a 6 second average block time.
 	pub const MAXIMUM_BLOCK_WEIGHT: Weight = WEIGHT_PER_SECOND / 2;
 }
+
+/// Opaque types. These are used by the CLI to instantiate machinery that don't need to know
+/// the specifics of the runtime. They can then be made to be agnostic over specific formats
+/// of data like extrinsics, allowing for them to continue syncing the network through upgrades
+/// to even the core data structures.
+pub mod opaque {
+	use super::*;
+	use sp_runtime::{generic, traits::BlakeTwo256};
+
+	pub use sp_runtime::OpaqueExtrinsic as UncheckedExtrinsic;
+	/// Opaque block header type.
+	pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// Opaque block type.
+	pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+	/// Opaque block identifier type.
+	pub type BlockId = generic::BlockId<Block>;
+}

polkadot-parachains/rococo/Cargo.toml

@@ -28,13 +28,15 @@ sp-consensus-aura = { git = "https://github.com/paritytech/substrate", default-f
 frame-support = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 frame-executive = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 frame-system = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
+frame-system-rpc-runtime-api = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 pallet-assets = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 pallet-balances = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 pallet-randomness-collective-flip = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 pallet-timestamp = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 pallet-sudo = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 pallet-transaction-payment = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 pallet-aura = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
+pallet-transaction-payment-rpc-runtime-api = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "master" }
 
 # Cumulus dependencies
 cumulus-pallet-aura-ext = { path = "../../pallets/aura-ext", default-features = false }

polkadot-parachains/rococo/src/lib.rs

@@ -590,6 +590,27 @@ impl_runtime_apis! {
 		}
 	}
 
+	impl frame_system_rpc_runtime_api::AccountNonceApi<Block, AccountId, Index> for Runtime {
+		fn account_nonce(account: AccountId) -> Index {
+			System::account_nonce(account)
+		}
+	}
+
+	impl pallet_transaction_payment_rpc_runtime_api::TransactionPaymentApi<Block, Balance> for Runtime {
+		fn query_info(
+			uxt: <Block as BlockT>::Extrinsic,
+			len: u32,
+		) -> pallet_transaction_payment_rpc_runtime_api::RuntimeDispatchInfo<Balance> {
+			TransactionPayment::query_info(uxt, len)
+		}
+		fn query_fee_details(
+			uxt: <Block as BlockT>::Extrinsic,
+			len: u32,
+		) -> pallet_transaction_payment::FeeDetails<Balance> {
+			TransactionPayment::query_fee_details(uxt, len)
+		}
+	}
+
 	impl cumulus_primitives_core::CollectCollationInfo<Block> for Runtime {
 		fn collect_collation_info() -> cumulus_primitives_core::CollationInfo {
 			ParachainSystem::collect_collation_info()