Add Transaction Fee RPC to Statemint/Statemine

polkadot-parachains/Cargo.toml

@@ -64,6 +64,9 @@ substrate-prometheus-endpoint = { git = "https://github.com/paritytech/substrate
 
 # RPC related dependencies
 jsonrpc-core = "15.1.0"
+txpool-api = { package = "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/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

@@ -586,6 +586,27 @@ 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()

polkadot-parachains/src/main.rs

@@ -24,6 +24,7 @@ mod chain_spec;
 mod service;
 mod cli;
 mod command;
+mod rpc;
 
 fn main() -> sc_cli::Result<()> {
 	command::run()

polkadot-parachains/src/rpc.rs

@@ -0,0 +1,89 @@
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
+// This file is part of Cumulus.
+
+// Cumulus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Cumulus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Cumulus.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Parachain-specific RPCs implementation.
+
+#![warn(missing_docs)]
+
+use std::sync::Arc;
+
+use sc_client_api::AuxStore;
+pub use sc_rpc::{DenyUnsafe, SubscriptionTaskExecutor};
+use sp_api::ProvideRuntimeApi;
+use sp_block_builder::BlockBuilder;
+use sp_blockchain::{Error as BlockChainError, HeaderBackend, HeaderMetadata};
+use txpool_api::TransactionPool;
+
+/// Alias to 512-bit hash when used in the context of a transaction signature on the chain.
+pub type Signature = sp_runtime::MultiSignature;
+/// Some way of identifying an account on the chain. We intentionally make it equivalent
+/// to the public key of our transaction signing scheme.
+pub type AccountId = <<Signature as sp_runtime::traits::Verify>::Signer as sp_runtime::traits::IdentifyAccount>::AccountId;
+type BlockNumber = u32;
+type Header = sp_runtime::generic::Header<BlockNumber, sp_runtime::traits::BlakeTwo256>;
+pub type Block = sp_runtime::generic::Block<Header, sp_runtime::OpaqueExtrinsic>;
+type Balance = u128;
+type Nonce = u32;
+
+/// A type representing all RPC extensions.
+pub type RpcExtension = jsonrpc_core::IoHandler<sc_rpc::Metadata>;
+
+/// Full client dependencies
+pub struct FullDeps<C, P> {
+	/// The client instance to use.
+	pub client: Arc<C>,
+	/// Transaction pool instance.
+	pub pool: Arc<P>,
+	/// Whether to deny unsafe calls
+	pub deny_unsafe: DenyUnsafe,
+}
+
+/// Instantiate all RPC extensions.
+pub fn create_full<C, P>(deps: FullDeps<C, P>) -> RpcExtension
+where
+	C: ProvideRuntimeApi<Block>
+		+ HeaderBackend<Block>
+		+ AuxStore
+		+ HeaderMetadata<Block, Error = BlockChainError>
+		+ Send
+		+ Sync
+		+ 'static,
+	C::Api: frame_rpc_system::AccountNonceApi<Block, AccountId, Nonce>,
+	C::Api: pallet_transaction_payment_rpc::TransactionPaymentRuntimeApi<Block, Balance>,
+	C::Api: BlockBuilder<Block>,
+	P: TransactionPool + Sync + Send + 'static,
+{
+	use frame_rpc_system::{FullSystem, SystemApi};
+	use pallet_transaction_payment_rpc::{TransactionPayment, TransactionPaymentApi};
+
+	let mut io = jsonrpc_core::IoHandler::default();
+	let FullDeps {
+		client,
+		pool,
+		deny_unsafe,
+	} = deps;
+
+	io.extend_with(SystemApi::to_delegate(FullSystem::new(
+		client.clone(),
+		pool,
+		deny_unsafe,
+	)));
+	io.extend_with(TransactionPaymentApi::to_delegate(TransactionPayment::new(
+		client.clone(),
+	)));
+
+	io
+}