MVHQ Gas Class Office Hours

Material for the Office Hours in MVHQ on the 08.04.2022. Includes hardhat Config and Gas simulation script.

Step 1: Software Installation

• Download and install NodeJS from https://nodejs.org/en/download/
• Download and install Visual Studio Code from https://code.visualstudio.com/

Step 2: Hardhat setup

• Download the scripts from the repo and extract the folder onto the Desktop.
• Open cmd or Powershell and navigate INTO the extracted folder with the command: cd ... Everything you do below is folder specific, if you would like to start over, Simply delete the folder and start over.
• Initialise NodeJS with the command: npm init
• Install hardhat with the command: npm install --save-dev hardhat
• Install all hardhat dependencies with the comand: npm install --save-dev @nomiclabs/hardhat-waffle ethereum-waffle chai @nomiclabs/hardhat-ethers ethers @openzeppelin/hardhat-upgrades

Step 3: Configure the simulation scripts simulateGas.js and hardhatconfig.js.
Temporary alchemy API keys (valid for a couple of days):

xbNNi6QORYH95QoC6vIDF81fdb52fTbe    
J3ZLw6VkpFeIMjpASi5R909aNmtt4J7V
T9tr2Vz56ngd1weSymVyyK76LnT7dfE1
Jc196Ty9a289WExzhv7n9tKVEnpV43_b
JNemY7zxf_s_VMtUSeb74DsUYIyuzedA

Code examples:

• Print something in the command line

console.log("something");

• Declare contract:

const targetContract = new ethers.Contract("0x0000000000000000000000000000000000000000", abi);

• Impersonate accounts

await hre.network.provider.request({
    method: "hardhat_impersonateAccount",
    params: ["0x0000000000000000000000000000000000000000"],
});
address1 = await ethers.provider.getSigner("0x0000000000000000000000000000000000000000");

• Set timestamp of the next block

await network.provider.send("evm_setNextBlockTimestamp", [0000000000]);

• Whenever your transaction has a VALUE (payable amount in GWEI) set overrides as last function argument.

overrides = {};
overrides.value = ethers.BigNumber.from((mintPrice * 1000000000000000000).toString());

• Estimate the gas consumption on a transaction (DOES NOT mine the transaction)

estimation = await targetContract.connect(address1).estimateGas.functionName(FunctionArguments, overrides);

• Mine a transaction through an impersonation

transaction = await targetContract.connect(address1).functionname(functionArguments, overrides);
transaction.wait();

Step 4: Run the simulation with the command: npx hardhat test simTemplate.js Please replace "simTemplate.js" with the name of your script.