connectors-gateway: Add Ethereum Transaction pallet (#1460)

* connectors-gateway: Add Ethereum Transaction pallet

* ethereum-transaction: Remove unused deps

* integration-tests: Remove default-features flag for EVM deps

* primitives: Add transaction recovery ID

* ethereum-transaction: Add pallet errors, use dispatch info var

* tests: Simplify mock runtime, add author const, add func for default test params

* integration-test: Simplify contract address retrieval by using iterator find

* taplo: Obey

* primitives: Fix doc link

Cargo.toml

@@ -44,6 +44,7 @@ members = [
   "pallets/collator-allowlist",
   "pallets/crowdloan-claim",
   "pallets/crowdloan-reward",
+  "pallets/ethereum-transaction",
   "pallets/fees",
   "pallets/interest-accrual",
   "pallets/investments",

libs/primitives/src/lib.rs

@@ -263,6 +263,11 @@ pub mod constants {
 
 	/// Unhashed 36-bytes prefix for currencies managed by Connectors.
 	pub const GENERAL_CURRENCY_INDEX_PREFIX: [u8; 36] = *b"CentrifugeGeneralCurrencyIndexPrefix";
+
+	/// Transaction recovery ID used for generating a signature in the Ethereum
+	/// Transaction pallet. As per:
+	/// <https://github.com/PureStake/moonbeam/blob/fb63014a5e487f17e31283776e4f6b0befd009a2/primitives/xcm/src/ethereum_xcm.rs#L167>
+	pub const TRANSACTION_RECOVERY_ID: u64 = 42;
 }
 
 /// Listing of parachains we integrate with.

libs/traits/src/ethereum.rs

@@ -0,0 +1,16 @@
+use frame_support::dispatch::DispatchResultWithPostInfo;
+use sp_runtime::app_crypto::sp_core::{H160, U256};
+
+/// Something capable of managing transactions in an EVM/Ethereum context
+pub trait EthereumTransactor {
+	/// Transacts the specified call in the EVM context,
+	/// exposing the call and any events to the EVM block.
+	fn call(
+		from: H160,
+		to: H160,
+		data: &[u8],
+		value: U256,
+		gas_price: U256,
+		gas_limit: U256,
+	) -> DispatchResultWithPostInfo;
+}

libs/traits/src/lib.rs

@@ -40,6 +40,8 @@ pub mod changes;
 pub mod connectors;
 /// Traits related to data registry and collection.
 pub mod data;
+/// Traits related to Ethereum/EVM.
+pub mod ethereum;
 /// Traits related to interest rates.
 pub mod interest;
 /// Traits related to rewards.

pallets/ethereum-transaction/Cargo.toml

@@ -0,0 +1,78 @@
+[package]
+authors = ["Centrifuge <admin@centrifuge.io>"]
+description = "Centrifuge Ethereum Transaction Pallet"
+edition = "2021"
+license = "LGPL-3.0"
+name = "pallet-ethereum-transaction"
+repository = "https://github.com/centrifuge/centrifuge-chain"
+version = "0.0.1"
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[dependencies]
+codec = { package = "parity-scale-codec", version = "3.0.0", features = ["derive"], default-features = false }
+frame-support = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-v0.9.38" }
+frame-system = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-v0.9.38" }
+scale-info = { version = "2.3.0", default-features = false, features = ["derive"] }
+sp-runtime = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-v0.9.38" }
+sp-std = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-v0.9.38" }
+
+# Benchmarking
+frame-benchmarking = { git = "https://github.com/paritytech/substrate", default-features = false, optional = true, branch = "polkadot-v0.9.38" }
+
+# Substrate crates
+sp-core = { git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-v0.9.38" }
+
+# Ethereum
+ethereum = { version = "0.14.0", default-features = false }
+fp-evm = { git = "https://github.com/PureStake/frontier", default-features = false, branch = "moonbeam-polkadot-v0.9.38" }
+pallet-ethereum = { git = "https://github.com/PureStake/frontier", default-features = false, branch = "moonbeam-polkadot-v0.9.38" }
+pallet-evm = { git = "https://github.com/PureStake/frontier", default-features = false, branch = "moonbeam-polkadot-v0.9.38" }
+
+# Our custom traits
+cfg-primitives = { path = "../../libs/primitives", default-features = false }
+cfg-traits = { path = "../../libs/traits", default-features = false }
+
+[dev-dependencies]
+sp-core = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.38" }
+sp-io = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.38" }
+
+pallet-balances = { git = "https://github.com/paritytech/substrate", branch = "polkadot-v0.9.38" }
+pallet-evm-precompile-simple = { git = "https://github.com/PureStake/frontier", branch = "moonbeam-polkadot-v0.9.38" }
+pallet-timestamp = { git = "https://github.com/purestake/substrate", branch = "moonbeam-polkadot-v0.9.38" }
+
+[features]
+default = ["std"]
+runtime-benchmarks = [
+  "frame-benchmarking/runtime-benchmarks",
+  "frame-support/runtime-benchmarks",
+  "frame-system/runtime-benchmarks",
+  "sp-runtime/runtime-benchmarks",
+  "cfg-traits/runtime-benchmarks",
+  "pallet-ethereum/runtime-benchmarks",
+  "pallet-evm/runtime-benchmarks",
+]
+std = [
+  "codec/std",
+  "cfg-traits/std",
+  "frame-support/std",
+  "frame-system/std",
+  "frame-benchmarking/std",
+  "sp-core/std",
+  "sp-std/std",
+  "sp-runtime/std",
+  "scale-info/std",
+  "pallet-ethereum/std",
+  "pallet-evm/std",
+  "fp-evm/std",
+  "ethereum/std",
+]
+try-runtime = [
+  "frame-support/try-runtime",
+  "frame-system/try-runtime",
+  "cfg-traits/try-runtime",
+  "pallet-ethereum/try-runtime",
+  "pallet-evm/try-runtime",
+  "sp-runtime/try-runtime",
+]