Statemine primitives (#1625)

* Statemine primitives

* ref issue in TODO

* fix TODO

bridges/relays/client-statemine/src/lib.rs

@@ -0,0 +1,112 @@
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
+// This file is part of Parity Bridges Common.
+
+// Parity Bridges Common 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.
+
+// Parity Bridges Common 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 Parity Bridges Common.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Types used to connect to the Statemine chain.
+
+use codec::Encode;
+use frame_support::weights::Weight;
+use relay_substrate_client::{
+	Chain, ChainBase, ChainWithTransactions, Error as SubstrateError, SignParam,
+	UnsignedTransaction,
+};
+use sp_core::Pair;
+use sp_runtime::{generic::SignedPayload, traits::IdentifyAccount};
+use std::time::Duration;
+
+pub mod runtime;
+
+/// Statemine chain definition
+#[derive(Debug, Clone, Copy)]
+pub struct Statemine;
+
+impl ChainBase for Statemine {
+	type BlockNumber = bp_statemine::BlockNumber;
+	type Hash = bp_statemine::Hash;
+	type Hasher = bp_statemine::Hasher;
+	type Header = bp_statemine::Header;
+
+	type AccountId = bp_statemine::AccountId;
+	type Balance = bp_statemine::Balance;
+	type Index = bp_statemine::Nonce;
+	type Signature = bp_statemine::Signature;
+
+	fn max_extrinsic_size() -> u32 {
+		bp_statemine::Statemine::max_extrinsic_size()
+	}
+
+	fn max_extrinsic_weight() -> Weight {
+		bp_statemine::Statemine::max_extrinsic_weight()
+	}
+}
+
+impl Chain for Statemine {
+	const NAME: &'static str = "Statemine";
+	const TOKEN_ID: Option<&'static str> = Some("kusama");
+	const BEST_FINALIZED_HEADER_ID_METHOD: &'static str = "<unused>";
+	const AVERAGE_BLOCK_INTERVAL: Duration = Duration::from_secs(6);
+	const STORAGE_PROOF_OVERHEAD: u32 = bp_statemine::EXTRA_STORAGE_PROOF_SIZE;
+
+	type SignedBlock = bp_statemine::SignedBlock;
+	type Call = runtime::Call;
+}
+
+impl ChainWithTransactions for Statemine {
+	type AccountKeyPair = sp_core::sr25519::Pair;
+	type SignedTransaction = runtime::UncheckedExtrinsic;
+
+	fn sign_transaction(
+		param: SignParam<Self>,
+		unsigned: UnsignedTransaction<Self>,
+	) -> Result<Self::SignedTransaction, SubstrateError> {
+		let raw_payload = SignedPayload::new(
+			unsigned.call.clone(),
+			bp_statemine::SignedExtensions::new(
+				param.spec_version,
+				param.transaction_version,
+				unsigned.era,
+				param.genesis_hash,
+				unsigned.nonce,
+				unsigned.tip,
+			),
+		)
+		.expect("SignedExtension never fails.");
+		let signature = raw_payload.using_encoded(|payload| param.signer.sign(payload));
+		let signer: sp_runtime::MultiSigner = param.signer.public().into();
+		let (call, extra, _) = raw_payload.deconstruct();
+
+		Ok(runtime::UncheckedExtrinsic::new_signed(
+			call,
+			signer.into_account().into(),
+			signature.into(),
+			extra,
+		))
+	}
+
+	fn is_signed(tx: &Self::SignedTransaction) -> bool {
+		tx.signature.is_some()
+	}
+
+	fn is_signed_by(signer: &Self::AccountKeyPair, tx: &Self::SignedTransaction) -> bool {
+		tx.signature
+			.as_ref()
+			.map(|(address, _, _)| *address == bp_statemine::Address::Id(signer.public().into()))
+			.unwrap_or(false)
+	}
+
+	fn parse_transaction(_tx: Self::SignedTransaction) -> Option<UnsignedTransaction<Self>> {
+		unimplemented!("not used on Statemine")
+	}
+}

bridges/relays/client-statemine/src/runtime.rs

@@ -0,0 +1,68 @@
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
+// This file is part of Parity Bridges Common.
+
+// Parity Bridges Common 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.
+
+// Parity Bridges Common 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 Parity Bridges Common.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Types that are specific to the Statemine runtime.
+
+use codec::{Decode, Encode};
+use scale_info::TypeInfo;
+use sp_runtime::FixedU128;
+
+/// Unchecked Statemine extrinsic.
+pub type UncheckedExtrinsic = bp_polkadot_core::UncheckedExtrinsic<Call>;
+
+/// Statemine Runtime `Call` enum.
+///
+/// The enum represents a subset of possible `Call`s we can send to Statemine chain.
+/// Ideally this code would be auto-generated from metadata, because we want to
+/// avoid depending directly on the ENTIRE runtime just to get the encoding of `Dispatchable`s.
+///
+/// All entries here (like pretty much in the entire file) must be kept in sync with Statemine
+/// `construct_runtime`, so that we maintain SCALE-compatibility.
+///
+/// See: [link](https://github.com/paritytech/cumulus/blob/master/parachains/runtimes/assets/statemine/src/lib.rs)
+#[allow(clippy::large_enum_variant)]
+#[derive(Encode, Decode, Debug, PartialEq, Eq, Clone, TypeInfo)]
+pub enum Call {
+	/// With-Statemint bridge pallet.
+	// TODO (https://github.com/paritytech/parity-bridges-common/issues/1626):
+	// must be updated when we'll make appropriate changes in the Statemine runtime
+	#[codec(index = 42)]
+	WithStatemintBridgePallet(WithStatemintBridgePalletCall),
+}
+
+/// Calls of the with-Statemint bridge pallet.
+// TODO (https://github.com/paritytech/parity-bridges-common/issues/1626):
+// must be updated when we'll make appropriate changes in the Statemine runtime
+#[derive(Encode, Decode, Debug, PartialEq, Eq, Clone, TypeInfo)]
+#[allow(non_camel_case_types)]
+pub enum WithStatemintBridgePalletCall {
+	#[codec(index = 42)]
+	update_dot_to_ksm_conversion_rate(FixedU128),
+}
+
+impl sp_runtime::traits::Dispatchable for Call {
+	type RuntimeOrigin = ();
+	type Config = ();
+	type Info = ();
+	type PostInfo = ();
+
+	fn dispatch(
+		self,
+		_origin: Self::RuntimeOrigin,
+	) -> sp_runtime::DispatchResultWithInfo<Self::PostInfo> {
+		unimplemented!("The Call is not expected to be dispatched.")
+	}
+}