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Governor Bravo Proposal

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Overview

Following the addition of FPS to project dependencies, the next step is creating a Proposal contract. This example serves as a guide for drafting a proposal for Governor Bravo contract.

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Proposal Contract

The BravoProposal_01 proposal is available in the fps-example-repoarrow-up-right. This contract is used as a reference for this tutorial.

Let's go through each of the overridden functions.

  • name(): Defines the name of your proposal.

    function name() public pure override returns (string memory) {
    return "BRAVO_MOCK";
}

  • description(): Provides a detailed description of your proposal.

    function description() public pure override returns (string memory) {
    return "Bravo proposal mock";
}

  • deploy(): Deploys any necessary contracts. This example demonstrates the deployment of Vault and an ERC20 token. Once deployed, these contracts are added to the Addresses contract by calling addAddress().

    function deploy() public override {
    // Set Governor Bravo's timelock as the owner for the vault and token
    address owner = addresses.getAddress("PROTOCOL_TIMELOCK_BRAVO");

    // Deploy the vault address if not already deployed and transfer ownership to the timelock
    if (!addresses.isAddressSet("BRAVO_VAULT")) {
        Vault bravoVault = new Vault();

        addresses.addAddress("BRAVO_VAULT", address(bravoVault), true);
        bravoVault.transferOwnership(owner);
    }

    // Deploy the token address if not already deployed, transfer ownership to the timelock
    // and transfer all initial minted tokens from the deployer to the timelock
    if (!addresses.isAddressSet("BRAVO_VAULT_TOKEN")) {
        Token token = new Token();
        addresses.addAddress("BRAVO_VAULT_TOKEN", address(token), true);
        token.transferOwnership(owner);

        // During forge script execution, the deployer of the contracts is
        // the DEPLOYER_EOA. However, when running through forge test, the deployer of the contracts is this contract.
        uint256 balance = token.balanceOf(address(this)) > 0
            ? token.balanceOf(address(this))
            : token.balanceOf(addresses.getAddress("DEPLOYER_EOA"));

        token.transfer(address(owner), balance);
    }
}

  • build(): Add actions to the proposal contract. In this example, an ERC20 token is whitelisted on the Vault contract. Then the Governor Bravo's timelock approves the token to be spent by the vault, and calls deposit on the vault. The actions should be written in solidity code and in the order they should be executed in the proposal. Any calls (except to the Addresses and Foundry Vm contract) will be recorded and stored as actions to execute in the run function. The caller address that will call actions is passed into buildModifier; it is the Governor Bravo's timelock for this example. The buildModifier is a necessary modifier for the build function and will not work without it. For further reading, see the build function.

    function build()
    public
    override
    buildModifier(addresses.getAddress("PROTOCOL_TIMELOCK_BRAVO"))
{
    /// STATICCALL -- non-mutative and hence not recorded for the run stage

    // Get the vault address
    address bravoVault = addresses.getAddress("BRAVO_VAULT");

    // Get the token address
    address token = addresses.getAddress("BRAVO_VAULT_TOKEN");

    // Get the timelock bravo's token balance
    uint256 balance = Token(token).balanceOf(
        addresses.getAddress("PROTOCOL_TIMELOCK_BRAVO")
    );

    /// CALLS -- mutative and recorded

    // Whitelist the deployed token on the deployed vault
    Vault(bravoVault).whitelistToken(token, true);

    // Approve the token for the vault
    Token(token).approve(bravoVault, balance);

    // Deposit all tokens into the vault
    Vault(bravoVault).deposit(token, balance);
}

  • run(): Sets up the environment for running the proposal. This sets addresses, primaryForkId, and governor, and then calls super.run() to run the entire proposal. In this example, primaryForkId is set to sepolia for executing the proposal. Next, the addresses object is set by reading from the addresses JSON file. The Governor Bravo contract to test is set using setGovernor. This will be used to check onchain calldata and simulate the proposal. For further reading, see the run function.

    function run() public override {
    // Create and select sepolia fork for proposal execution.
    primaryForkId = vm.createFork("sepolia");
    vm.selectFork(primaryForkId);

    string memory addressesFolderPath = "./addresses";
    uint256[] memory chainIds = new uint256[](1);
    chainIds[0] = 11155111;
    // Set addresses object reading addresses from json file.
    setAddresses(
        new Addresses(addressesFolderPath, chainIds)
    );

    // Set Governor Bravo. This address is used for proposal simulation and check on
    // chain proposal state.
    setGovernor(addresses.getAddress("PROTOCOL_GOVERNOR"));

    // Call the run function of parent contract 'Proposal.sol'.
    super.run();
}

  • simulate(): For Governor Bravo proposals, this function is defined in the governance specific contract and needs not be overridden. This function executes the proposal actions outlined in the build() step. The following steps are run when simulating a proposal. First, the required number of governance tokens are minted to the proposer address. Second, the proposer delegates votes to himself and proposes the proposal. Then the time is skipped by the voting delay, proposer casts votes and the proposal is queued. Next, time is skipped by the timelock delay and then finally, the proposal is executed in the timelock. View the code snippet below with inline comments for an example.

    /// @notice Simulate governance proposal
function simulate() public override {
    address proposerAddress = address(1);
    IERC20VotesComp governanceToken = governor.comp();
    {
        // Ensure proposer has meets minimum proposal threshold and quorum votes to pass the proposal
        uint256 quorumVotes = governor.quorumVotes();
        uint256 proposalThreshold = governor.proposalThreshold();
        uint256 votingPower = quorumVotes > proposalThreshold
            ? quorumVotes
            : proposalThreshold;
        deal(address(governanceToken), proposerAddress, votingPower);
        // Delegate proposer's votes to itself
        vm.prank(proposerAddress);
        IERC20VotesComp(governanceToken).delegate(proposerAddress);
        vm.roll(block.number + 1);
    }

    bytes memory proposeCalldata = getCalldata();

    // Register the proposal
    vm.prank(proposerAddress);
    bytes memory data = address(governor).functionCall(proposeCalldata);
    uint256 proposalId = abi.decode(data, (uint256));

    // Check proposal is in Pending state
    require(
        governor.state(proposalId) == IGovernorBravo.ProposalState.Pending
    );

    // Roll to Active state (voting period)
    vm.roll(block.number + governor.votingDelay() + 1);
    require(
        governor.state(proposalId) == IGovernorBravo.ProposalState.Active
    );

    // Vote YES
    vm.prank(proposerAddress);
    governor.castVote(proposalId, 1);

    // Roll to allow proposal state transitions
    vm.roll(block.number + governor.votingPeriod());
    require(
        governor.state(proposalId) == IGovernorBravo.ProposalState.Succeeded
    );

    // Queue the proposal
    governor.queue(proposalId);
    require(
        governor.state(proposalId) == IGovernorBravo.ProposalState.Queued
    );

    // Warp to allow proposal execution on timelock
    ITimelockBravo timelock = ITimelockBravo(governor.timelock());
    vm.warp(block.timestamp + timelock.delay());

    // Execute the proposal
    governor.execute(proposalId);
    require(
        governor.state(proposalId) == IGovernorBravo.ProposalState.Executed
    );
}

  • validate(): This final step validates the system in its post-execution state. It ensures that Governor Bravo's timelock is the new owner of the Vault and token, the tokens were transferred to Governor Bravo's timelock, and the token was whitelisted on the Vault contract.

    function validate() public override {
    // Get the vault address
    Vault bravoVault = Vault(addresses.getAddress("BRAVO_VAULT"));

    // Get the token address
    Token token = Token(addresses.getAddress("BRAVO_VAULT_TOKEN"));

    // Get Governor Bravo's timelock address
    address timelock = addresses.getAddress("PROTOCOL_TIMELOCK_BRAVO");

    // Ensure the token total supply is 10 million
    assertEq(token.totalSupply(), 10_000_000e18);

    // Ensure the timelock is the owner of the deployed token
    assertEq(token.owner(), address(timelock));

    // Ensure the timelock is the owner of the deployed vault
    assertEq(bravoVault.owner(), address(timelock));

    // Ensure the vault is not paused
    assertFalse(bravoVault.paused());

    // Ensure the token is whitelisted on the vault
    assertTrue(bravoVault.tokenWhitelist(address(token)));

    // Get the vault's token balance
    uint256 balance = token.balanceOf(address(bravoVault));

    // Get the timelock deposits in the vault
    (uint256 amount, ) = bravoVault.deposits(
        address(token),
        address(timelock)
    );

    // Ensure the timelock deposit is the same as the vault's token balance
    assertEq(amount, balance);

    // Ensure all minted tokens are deposited into the vault
    assertEq(token.balanceOf(address(bravoVault)), token.totalSupply());
}

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Proposal Simulation

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Deploying a Governor Bravo on Testnet

A Governor Bravo contract is needed to be set up on the testnet before running the proposal.

This script DeployGovernorBravoarrow-up-right facilitates this process.

Before running the script, add the DEPLOYER_EOA address to the 11155111.json file.

After adding the address, execute the script:

Double-check that the ${wallet_name} and ${wallet_address} accurately match the wallet details saved in ~/.foundry/keystores/.

Copy the addresses of the timelock, governor, and governance token from the script output and add them to the 11155111.json file. The file should follow this structure:

After adding the addresses, run the second script to accept ownership of the timelock and initialize the governor. The script to facilate this process is InitializeBravoarrow-up-right. Before running the script, obtain the eta from the queue transaction on the previous script and set it as an environment variable.

Run the script:

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Setting Up the Addresses JSON

Copy the GOVERNOR_BRAVO_ALPHA address from the script output and add it to the 11155111.json file. The final 11155111.json file should follow this structure:

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Running the Proposal

The script will output the following:

A DAO member can verify whether the calldata proposed on the governance matches the calldata from the script execution. It is crucial to note that two new addresses have been added to the Addresses.sol storage. These addresses are not included in the JSON files when proposal is run without the DO_UPDATE_ADDRESS_JSON flag set to true.

The proposal script will deploy the contracts in the deploy() method and will generate actions calldata for each individual action along with proposal calldata for the proposal. The proposal can be manually proposed using cast send along with the calldata generated above.

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