Enable Native ERC20 precompile in Moonriver (#1103)

* Enable Native ERC20 precompile * Cargo sort * Cargo sort * FMT
moonbeam-foundation · Dec 17, 2021 · 60bb5ce · 60bb5ce
1 parent 75e0a3a
commit 60bb5ce
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Showing 3 changed files with 35 additions and 3 deletions.
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/runtime/moonriver/Cargo.toml b/runtime/moonriver/Cargo.toml
@@ -36,6 +36,7 @@ xcm-transactor = { path = "../../pallets/xcm-transactor", default-features = fal
 # Moonbeam precompiles
 crowdloan-rewards-precompiles = { path = "../../precompiles/crowdloan-rewards", default-features = false }
 pallet-evm-precompile-assets-erc20 = { path = "../../precompiles/assets-erc20", default-features = false }
+pallet-evm-precompile-balances-erc20 = { path = "../../precompiles/balances-erc20", default-features = false }
 parachain-staking-precompiles = { path = "../../precompiles/parachain-staking", default-features = false }
 relay-encoder-precompiles = { path = "../../precompiles/relay-encoder", default-features = false }
 xcm-transactor-precompiles = { path = "../../precompiles/xcm_transactor", default-features = false }
@@ -170,6 +171,7 @@ std = [
 	"pallet-democracy/std",
 	"pallet-ethereum-chain-id/std",
 	"pallet-ethereum/std",
+	"pallet-evm-precompile-balances-erc20/std",
 	"pallet-evm/std",
 	"pallet-maintenance-mode/std",
 	"pallet-migrations/std",

diff --git a/runtime/moonriver/src/precompiles.rs b/runtime/moonriver/src/precompiles.rs
@@ -19,6 +19,7 @@ use fp_evm::{Context, ExitError, PrecompileOutput};
 use moonbeam_relay_encoder::kusama::KusamaEncoder;
 use pallet_evm::{AddressMapping, Precompile, PrecompileSet};
 use pallet_evm_precompile_assets_erc20::Erc20AssetsPrecompileSet;
+use pallet_evm_precompile_balances_erc20::{Erc20BalancesPrecompile, Erc20Metadata};
 use pallet_evm_precompile_blake2::Blake2F;
 use pallet_evm_precompile_bn128::{Bn128Add, Bn128Mul, Bn128Pairing};
 use pallet_evm_precompile_dispatch::Dispatch;
@@ -33,6 +34,26 @@ use sp_std::marker::PhantomData;
 use xcm_transactor_precompiles::XcmTransactorWrapper;
 use xtokens_precompiles::XtokensWrapper;
 
+pub struct NativeErc20Metadata;
+
+/// ERC20 metadata for the native token.
+impl Erc20Metadata for NativeErc20Metadata {
+	/// Returns the name of the token.
+	fn name() -> &'static str {
+		"MOVR token"
+	}
+
+	/// Returns the symbol of the token.
+	fn symbol() -> &'static str {
+		"MOVR"
+	}
+
+	/// Returns the decimals places of the token.
+	fn decimals() -> u8 {
+		18
+	}
+}
+
 /// The asset precompile address prefix. Addresses that match against this prefix will be routed
 /// to Erc20AssetsPrecompileSet
 pub const ASSET_PRECOMPILE_ADDRESS_PREFIX: &[u8] = &[255u8; 4];
@@ -51,9 +72,11 @@ where
 	/// Return all addresses that contain precompiles. This can be used to populate dummy code
 	/// under the precompile.
 	pub fn used_addresses() -> impl Iterator<Item = R::AccountId> {
-		sp_std::vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 1024, 1025, 1026, 2048, 2049, 2052, 2053, 2054]
-			.into_iter()
-			.map(|x| R::AddressMapping::into_account_id(hash(x)))
+		sp_std::vec![
+			1, 2, 3, 4, 5, 6, 7, 8, 9, 1024, 1025, 1026, 2048, 2049, 2050, 2052, 2053, 2054
+		]
+		.into_iter()
+		.map(|x| R::AddressMapping::into_account_id(hash(x)))
 	}
 }
 
@@ -66,6 +89,7 @@ where
 	Dispatch<R>: Precompile,
 	ParachainStakingWrapper<R>: Precompile,
 	CrowdloanRewardsWrapper<R>: Precompile,
+	Erc20BalancesPrecompile<R, NativeErc20Metadata>: Precompile,
 	Erc20AssetsPrecompileSet<R>: PrecompileSet,
 	XtokensWrapper<R>: Precompile,
 	RelayEncoderWrapper<R, KusamaEncoder>: Precompile,
@@ -99,6 +123,11 @@ where
 			a if a == hash(2049) => Some(CrowdloanRewardsWrapper::<R>::execute(
 				input, target_gas, context,
 			)),
+			a if a == hash(2050) => {
+				Some(Erc20BalancesPrecompile::<R, NativeErc20Metadata>::execute(
+					input, target_gas, context,
+				))
+			}
 			a if a == hash(2052) => Some(XtokensWrapper::<R>::execute(input, target_gas, context)),
 			a if a == hash(2053) => Some(RelayEncoderWrapper::<R, KusamaEncoder>::execute(
 				input, target_gas, context,