Work on testing the Router

processor/ethereum/test-primitives/Cargo.toml

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+[package]
+name = "serai-ethereum-test-primitives"
+version = "0.1.0"
+description = "Test primitives for Ethereum"
+license = "AGPL-3.0-only"
+repository = "https://github.com/serai-dex/serai/tree/develop/processor/ethereum/test-primitives"
+authors = ["Luke Parker <lukeparker5132@gmail.com>"]
+edition = "2021"
+publish = false
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]
+
+[lints]
+workspace = true
+
+[dependencies]
+k256 = { version = "0.13", default-features = false, features = ["std"] }
+
+alloy-core = { version = "0.8", default-features = false }
+alloy-consensus = { version = "0.3", default-features = false, features = ["std"] }
+
+alloy-rpc-types-eth = { version = "0.3", default-features = false }
+alloy-simple-request-transport = { path = "../../../networks/ethereum/alloy-simple-request-transport", default-features = false }
+alloy-provider = { version = "0.3", default-features = false }
+
+ethereum-primitives = { package = "serai-processor-ethereum-primitives", path = "../primitives", default-features = false }

processor/ethereum/test-primitives/LICENSE

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+AGPL-3.0-only license
+
+Copyright (c) 2022-2024 Luke Parker
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License Version 3 as
+published by the Free Software Foundation.
+
+This program 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.

processor/ethereum/test-primitives/README.md

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+# Ethereum Router
+
+The [Router contract](./contracts/Router.sol) is extensively documented to ensure clarity and
+understanding of the design decisions made. Please refer to it for understanding of why/what this
+is.

processor/ethereum/test-primitives/src/lib.rs

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+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![doc = include_str!("../README.md")]
+#![deny(missing_docs)]
+
+use k256::{elliptic_curve::sec1::ToEncodedPoint, ProjectivePoint};
+
+use alloy_core::{
+  primitives::{Address, U256, Bytes, Signature, TxKind},
+  hex::FromHex,
+};
+use alloy_consensus::{SignableTransaction, TxLegacy, Signed};
+
+use alloy_rpc_types_eth::TransactionReceipt;
+use alloy_simple_request_transport::SimpleRequest;
+use alloy_provider::{Provider, RootProvider};
+
+use ethereum_primitives::{keccak256, deterministically_sign};
+
+fn address(point: &ProjectivePoint) -> [u8; 20] {
+  let encoded_point = point.to_encoded_point(false);
+  // Last 20 bytes of the hash of the concatenated x and y coordinates
+  // We obtain the concatenated x and y coordinates via the uncompressed encoding of the point
+  keccak256(&encoded_point.as_ref()[1 .. 65])[12 ..].try_into().unwrap()
+}
+
+/// Fund an account.
+pub async fn fund_account(provider: &RootProvider<SimpleRequest>, address: Address, value: U256) {
+  let _: () = provider
+    .raw_request("anvil_setBalance".into(), [address.to_string(), value.to_string()])
+    .await
+    .unwrap();
+}
+
+/// Publish an already-signed transaction.
+pub async fn publish_tx(
+  provider: &RootProvider<SimpleRequest>,
+  tx: Signed<TxLegacy>,
+) -> TransactionReceipt {
+  // Fund the sender's address
+  fund_account(
+    provider,
+    tx.recover_signer().unwrap(),
+    (U256::from(tx.tx().gas_limit) * U256::from(tx.tx().gas_price)) + tx.tx().value,
+  )
+  .await;
+
+  let (tx, sig, _) = tx.into_parts();
+  let mut bytes = vec![];
+  tx.encode_with_signature_fields(&sig, &mut bytes);
+  let pending_tx = provider.send_raw_transaction(&bytes).await.unwrap();
+  pending_tx.get_receipt().await.unwrap()
+}
+
+/// Deploy a contract.
+///
+/// The contract deployment will be done by a random account.
+pub async fn deploy_contract(
+  provider: &RootProvider<SimpleRequest>,
+  file_path: &str,
+  constructor_arguments: &[u8],
+) -> Address {
+  let hex_bin_buf = std::fs::read_to_string(file_path).unwrap();
+  let hex_bin =
+    if let Some(stripped) = hex_bin_buf.strip_prefix("0x") { stripped } else { &hex_bin_buf };
+  let mut bin = Vec::<u8>::from(Bytes::from_hex(hex_bin).unwrap());
+  bin.extend(constructor_arguments);
+
+  let deployment_tx = TxLegacy {
+    chain_id: None,
+    nonce: 0,
+    // 100 gwei
+    gas_price: 100_000_000_000u128,
+    gas_limit: 1_000_000,
+    to: TxKind::Create,
+    value: U256::ZERO,
+    input: bin.into(),
+  };
+
+  let deployment_tx = deterministically_sign(&deployment_tx);
+
+  let receipt = publish_tx(provider, deployment_tx).await;
+  assert!(receipt.status());
+
+  receipt.contract_address.unwrap()
+}
+
+/// Sign and send a transaction from the specified wallet.
+///
+/// This assumes the wallet is funded.
+pub async fn send(
+  provider: &RootProvider<SimpleRequest>,
+  wallet: &k256::ecdsa::SigningKey,
+  mut tx: TxLegacy,
+) -> TransactionReceipt {
+  let verifying_key = *wallet.verifying_key().as_affine();
+  let address = Address::from(address(&verifying_key.into()));
+
+  // https://github.com/alloy-rs/alloy/issues/539
+  // let chain_id = provider.get_chain_id().await.unwrap();
+  // tx.chain_id = Some(chain_id);
+  tx.chain_id = None;
+  tx.nonce = provider.get_transaction_count(address).await.unwrap();
+  // 100 gwei
+  tx.gas_price = 100_000_000_000u128;
+
+  let sig = wallet.sign_prehash_recoverable(tx.signature_hash().as_ref()).unwrap();
+  assert_eq!(address, tx.clone().into_signed(sig.into()).recover_signer().unwrap());
+  assert!(
+    provider.get_balance(address).await.unwrap() >
+      ((U256::from(tx.gas_price) * U256::from(tx.gas_limit)) + tx.value)
+  );
+
+  let mut bytes = vec![];
+  tx.encode_with_signature_fields(&Signature::from(sig), &mut bytes);
+  let pending_tx = provider.send_raw_transaction(&bytes).await.unwrap();
+  pending_tx.get_receipt().await.unwrap()
+}