Add USD to ETH Chainlink oracle connector for LUSD

packages/contracts/contracts/Integrations/LSUDUsdToLUSDEth.sol

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.6.11;
+
+
+interface IPriceFeed {
+    function latestAnswer() external view returns (int256);
+}
+
+
+contract LSUDUsdToLUSDEth is IPriceFeed {
+    IPriceFeed public constant LUSD_USD = IPriceFeed(0x3D7aE7E594f2f2091Ad8798313450130d0Aba3a0);
+    IPriceFeed public constant ETH_USD = IPriceFeed(0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419);
+
+    constructor() public {}
+
+    function latestAnswer() external view override returns (int256) {
+        return (LUSD_USD.latestAnswer() * 1 ether) / ETH_USD.latestAnswer();
+    }
+}

packages/contracts/hardhat.config.mainnet-fork.js

@@ -55,9 +55,10 @@ module.exports = {
     },
     networks: {
         hardhat: {
-            accounts: accountsList,
+            // https://github.com/NomicFoundation/hardhat/issues/1226#issuecomment-774492503
+            //accounts: accountsList,
             gas: 10000000,  // tx gas limit
-            blockGasLimit: 12500000, 
+            blockGasLimit: 12500000,
             gasPrice: process.env.GAS_PRICE ? parseInt(process.env.GAS_PRICE) : 20000000000,
             forking: {
                 url: alchemyUrl(),

packages/contracts/mainnetDeployment/aaveEthOracleDeployment.js

@@ -0,0 +1,36 @@
+// Test with:
+// GAS_PRICE=70832172907 BLOCK_NUMBER=15122486 npx hardhat run mainnetDeployment/aaveEthOracleDeployment.js --config hardhat.config.mainnet-fork.js
+
+// Deploy on mainnet with:
+// GAS_PRICE=40000000000 npx hardhat run mainnetDeployment/aaveEthOracleDeployment.js --network mainnet
+// make sure you have the right private key for DEPLOYER_PRIVATEKEY in secrets.js
+
+async function main() {
+  // Uncomment for testing:
+  /*
+  const impersonateAddress = "0x31c57298578f7508B5982062cfEc5ec8BD346247";
+  await hre.network.provider.request({
+    method: "hardhat_impersonateAccount",
+    params: [ impersonateAddress ]
+  });
+  const deployerWallet = await ethers.provider.getSigner(impersonateAddress);
+  const deployerWalletAddress = impersonateAddress;
+  */
+
+  const deployerWallet = (await ethers.getSigners())[0];
+  const deployerWalletAddress = deployerWallet.address;
+  console.log('Deployer: ', deployerWalletAddress);
+
+  const LSUDUsdToLUSDEthEthersFactory = await ethers.getContractFactory("LSUDUsdToLUSDEth", deployerWallet)
+  const lsudUsdToLUSDEth = await LSUDUsdToLUSDEthEthersFactory.deploy()
+  console.log(`LSUDUsdToLUSDEth address: ${lsudUsdToLUSDEth.address}`)
+  console.log(`LSUDUsdToLUSDEth price:   ${await lsudUsdToLUSDEth.latestAnswer()}`)
+
+}
+
+main()
+  .then(() => process.exit(0))
+  .catch(error => {
+    console.error(error);
+    process.exit(1);
+  });