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Last active January 28, 2023 18:23
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
...
contract SimpleGovernance {
...
struct GovernanceAction {
address receiver;
bytes data;
uint256 weiAmount;
uint256 proposedAt;
uint256 executedAt;
}
...
uint256 private ACTION_DELAY_IN_SECONDS = 2 days;
...
function queueAction(address receiver, bytes calldata data, uint256 weiAmount) external returns (uint256) {
require(_hasEnoughVotes(msg.sender), "Not enough votes to propose an action");
require(receiver != address(this), "Cannot queue actions that affect Governance");
uint256 actionId = actionCounter;
GovernanceAction storage actionToQueue = actions[actionId];
actionToQueue.receiver = receiver;
actionToQueue.weiAmount = weiAmount;
actionToQueue.data = data;
actionToQueue.proposedAt = block.timestamp;
actionCounter++;
emit ActionQueued(actionId, msg.sender);
return actionId;
}
function executeAction(uint256 actionId) external payable {
require(_canBeExecuted(actionId), "Cannot execute this action");
GovernanceAction storage actionToExecute = actions[actionId];
actionToExecute.executedAt = block.timestamp;
actionToExecute.receiver.functionCallWithValue(
actionToExecute.data,
actionToExecute.weiAmount
);
emit ActionExecuted(actionId, msg.sender);
}
function getActionDelay() public view returns (uint256) {
return ACTION_DELAY_IN_SECONDS;
}
/**
* @dev an action can only be executed if:
* 1) it's never been executed before and
* 2) enough time has passed since it was first proposed
*/
function _canBeExecuted(uint256 actionId) private view returns (bool) {
GovernanceAction memory actionToExecute = actions[actionId];
return (
actionToExecute.executedAt == 0 &&
(block.timestamp - actionToExecute.proposedAt >= ACTION_DELAY_IN_SECONDS)
);
}
function _hasEnoughVotes(address account) private view returns (bool) {
uint256 balance = governanceToken.getBalanceAtLastSnapshot(account);
uint256 halfTotalSupply = governanceToken.getTotalSupplyAtLastSnapshot() / 2;
return balance > halfTotalSupply;
}
}
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