Fee token pricer support

scripts/ethcommands.ts

@@ -140,6 +140,41 @@ async function deployERC20Contract(deployerWallet: Wallet, decimals: number): Pr
     return token.address;
 }
 
+async function deployFeeTokenPricerContract(deployerWallet: Wallet, exchangeRate: BigNumber): Promise<string> {
+  //// Bytecode below is generated from this simple FeeTokenPricer contract
+
+  // pragma solidity ^0.8.16;
+
+  // interface IFeeTokenPricer {
+  //     /**
+  //      * @notice Get the number of child chain's fee tokens per 1 parent chain's native token. Exchange rate must be
+  //      *         denominated in 18 decimals.
+  //      * @dev    For example, parent chain's native token is ETH, fee token is DAI. If price of 1ETH = 2000DAI, then function should return 2000*1e18.
+  //      *         If fee token is USDC instead and price of 1ETH = 2000USDC, function should still return 2000*1e18, no matter that USDC uses 6 decimals.
+  //      */
+  //     function getExchangeRate() external returns (uint256);
+  // }
+
+  // contract ConstantFeeTokenPricer is IFeeTokenPricer {
+  //     uint256 immutable public constExchangeRate;
+  //     constructor(uint256 _constExchangeRate) {
+  //         constExchangeRate = _constExchangeRate;
+  //     }
+
+  //     function getExchangeRate() external view returns (uint256) {
+  //         return constExchangeRate;
+  //     }
+  // }
+
+  const feeTokenPricerBytecode = "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";
+  const abi = ["constructor(uint256 exchangeRate)"];
+  const feeTokenPricerFactory = new ContractFactory(abi, feeTokenPricerBytecode, deployerWallet);
+  const feeTokenPricer = await feeTokenPricerFactory.deploy(exchangeRate);
+  await feeTokenPricer.deployTransaction.wait();
+
+  return feeTokenPricer.address;
+}
+
 async function deployWETHContract(deployerWallet: Wallet): Promise<string> {
     const wethFactory = new ContractFactory(TestWETH9.abi, TestWETH9.bytecode, deployerWallet);
     const weth = await wethFactory.deploy("Wrapped Ether", "WETH");
@@ -382,6 +417,29 @@ export const createERC20Command = {
   },
 };
 
+export const createFeeTokenPricerCommand = {
+  command: "create-fee-token-pricer",
+  describe: "creates Constant Fee Token Pricer on L2",
+  builder: {
+    deployer: {
+      string: true,
+      describe: "account (see general help)"
+    },
+  },
+  handler: async (argv: any) => {
+    console.log("create-fee-token-pricer");
+
+    argv.provider = new ethers.providers.WebSocketProvider(argv.l2url);
+    const deployerWallet = new Wallet(
+      ethers.utils.sha256(ethers.utils.toUtf8Bytes(argv.deployer)),
+      argv.provider
+    );
+    const feeTokenPricerAddress = await deployFeeTokenPricerContract(deployerWallet, BigNumber.from("15000000000000000000"));
+    console.log("Contract deployed at address:", feeTokenPricerAddress);
+
+    argv.provider.destroy();
+  },
+};
 // Will revert if the keyset is already valid.
 async function setValidKeyset(argv: any, upgradeExecutorAddr: string, sequencerInboxAddr: string, keyset: string){
     const innerIface = new ethers.utils.Interface(["function setValidKeyset(bytes)"])

scripts/index.ts

@@ -23,6 +23,7 @@ import {
   setValidKeysetCommand,
   waitForSyncCommand,
   transferL3ChainOwnershipCommand,
+  createFeeTokenPricerCommand,
 } from "./ethcommands";
 
 async function main() {
@@ -41,6 +42,7 @@ async function main() {
     .command(bridgeToL3Command)
     .command(bridgeNativeTokenToL3Command)
     .command(createERC20Command)
+    .command(createFeeTokenPricerCommand)
     .command(createWETHCommand)
     .command(transferERC20Command)
     .command(sendL1Command)

test-node.bash

@@ -52,6 +52,7 @@ consensusclient=false
 boldupgrade=false
 redundantsequencers=0
 l3_custom_fee_token=false
+l3_custom_fee_token_pricer=false
 l3_token_bridge=false
 l3_custom_fee_token_decimals=18
 batchposters=1
@@ -226,6 +227,14 @@ while [[ $# -gt 0 ]]; do
             l3_custom_fee_token=true
             shift
             ;;
+        --l3-fee-token-pricer)
+            if ! $l3_custom_fee_token; then
+                echo "Error: --l3-fee-token-pricer requires --l3-fee-token to be provided."
+                exit 1
+            fi
+            l3_custom_fee_token_pricer=true
+            shift
+            ;;
         --l3-fee-token-decimals)
             if ! $l3_custom_fee_token; then
                 echo "Error: --l3-fee-token-decimals requires --l3-fee-token to be provided."
@@ -583,6 +592,11 @@ if $force_init; then
             docker compose run scripts transfer-erc20 --token $nativeTokenAddress --amount 10000 --from user_fee_token_deployer --to l3owner
             docker compose run scripts transfer-erc20 --token $nativeTokenAddress --amount 10000 --from user_fee_token_deployer --to user_token_bridge_deployer
             EXTRA_L3_DEPLOY_FLAG="-e FEE_TOKEN_ADDRESS=$nativeTokenAddress"
+            if $l3_custom_fee_token_pricer; then
+                echo == Deploying custom fee token pricer
+                feeTokenPricerAddress=`docker compose run scripts create-fee-token-pricer --deployer user_fee_token_deployer | tail -n 1 | awk '{ print $NF }'`
+                EXTRA_L3_DEPLOY_FLAG="$EXTRA_L3_DEPLOY_FLAG -e FEE_TOKEN_PRICER_ADDRESS=$feeTokenPricerAddress"
+            fi
         fi
 
         echo == Deploying L3