Michael D. George
3 years ago
committed by
GitHub
commit
8c0684ad13
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// SPDX-License-Identifier: MIT |
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|
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pragma solidity ^0.8.0; |
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import "../Governor.sol"; |
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import "../../utils/math/Math.sol"; |
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/** |
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* @dev A module that ensures there is a minimum voting period after quorum is reached. This prevents a large voter from |
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* swaying a vote and triggering quorum at the last minute, by ensuring there is always time for other voters to react |
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* and try to oppose the decision. |
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* |
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* If a vote causes quorum to be reached, the proposal's voting period may be extended so that it does not end before at |
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* least a given number of blocks have passed (the "vote extension" parameter). This parameter can be set by the |
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* governance executor (e.g. through a governance proposal). |
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* |
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* _Available since v4.5._ |
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*/ |
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abstract contract GovernorPreventLateQuorum is Governor { |
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using SafeCast for uint256; |
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using Timers for Timers.BlockNumber; |
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uint64 private _voteExtension; |
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mapping(uint256 => Timers.BlockNumber) private _extendedDeadlines; |
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/// @dev Emitted when a proposal deadline is pushed back due to reaching quorum late in its voting period. |
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event ProposalExtended(uint256 indexed proposalId, uint64 extendedDeadline); |
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/// @dev Emitted when the {lateQuorumVoteExtension} parameter is changed. |
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event LateQuorumVoteExtensionSet(uint64 oldVoteExtension, uint64 newVoteExtension); |
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/** |
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* @dev Initializes the vote extension parameter: the number of blocks that are required to pass since a proposal |
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* reaches quorum until its voting period ends. If necessary the voting period will be extended beyond the one set |
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* at proposal creation. |
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*/ |
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constructor(uint64 initialVoteExtension) { |
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_setLateQuorumVoteExtension(initialVoteExtension); |
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} |
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|
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/** |
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* @dev Returns the proposal deadline, which may have been extended beyond that set at proposal creation, if the |
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* proposal reached quorum late in the voting period. See {Governor-proposalDeadline}. |
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*/ |
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function proposalDeadline(uint256 proposalId) public view virtual override returns (uint256) { |
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return Math.max(super.proposalDeadline(proposalId), _extendedDeadlines[proposalId].getDeadline()); |
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} |
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|
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/** |
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* @dev Casts a vote and detects if it caused quorum to be reached, potentially extending the voting period. See |
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* {Governor-_castVote}. |
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* |
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* May emit a {ProposalExtended} event. |
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*/ |
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function _castVote( |
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uint256 proposalId, |
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address account, |
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uint8 support, |
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string memory reason |
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) internal virtual override returns (uint256) { |
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uint256 result = super._castVote(proposalId, account, support, reason); |
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Timers.BlockNumber storage extendedDeadline = _extendedDeadlines[proposalId]; |
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if (extendedDeadline.isUnset() && _quorumReached(proposalId)) { |
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uint64 extendedDeadlineValue = block.number.toUint64() + lateQuorumVoteExtension(); |
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if (extendedDeadlineValue > proposalDeadline(proposalId)) { |
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emit ProposalExtended(proposalId, extendedDeadlineValue); |
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} |
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extendedDeadline.setDeadline(extendedDeadlineValue); |
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} |
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return result; |
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} |
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/** |
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* @dev Returns the current value of the vote extension parameter: the number of blocks that are required to pass |
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* from the time a proposal reaches quorum until its voting period ends. |
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*/ |
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function lateQuorumVoteExtension() public view virtual returns (uint64) { |
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return _voteExtension; |
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} |
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/** |
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* @dev Changes the {lateQuorumVoteExtension}. This operation can only be performed by the governance executor, |
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* generally through a governance proposal. |
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* |
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* Emits a {LateQuorumVoteExtensionSet} event. |
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*/ |
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function setLateQuorumVoteExtension(uint64 newVoteExtension) public virtual onlyGovernance { |
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_setLateQuorumVoteExtension(newVoteExtension); |
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} |
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/** |
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* @dev Changes the {lateQuorumVoteExtension}. This is an internal function that can be exposed in a public function |
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* like {setLateQuorumVoteExtension} if another access control mechanism is needed. |
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* |
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* Emits a {LateQuorumVoteExtensionSet} event. |
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*/ |
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function _setLateQuorumVoteExtension(uint64 newVoteExtension) internal virtual { |
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emit LateQuorumVoteExtensionSet(_voteExtension, newVoteExtension); |
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_voteExtension = newVoteExtension; |
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} |
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} |
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@ -0,0 +1,60 @@ |
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// SPDX-License-Identifier: MIT |
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pragma solidity ^0.8.0; |
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import "../governance/extensions/GovernorPreventLateQuorum.sol"; |
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import "../governance/extensions/GovernorSettings.sol"; |
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import "../governance/extensions/GovernorCountingSimple.sol"; |
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import "../governance/extensions/GovernorVotes.sol"; |
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contract GovernorPreventLateQuorumMock is |
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GovernorSettings, |
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GovernorVotes, |
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GovernorCountingSimple, |
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GovernorPreventLateQuorum |
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{ |
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uint256 private _quorum; |
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constructor( |
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string memory name_, |
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ERC20Votes token_, |
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uint256 votingDelay_, |
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uint256 votingPeriod_, |
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uint256 quorum_, |
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uint64 voteExtension_ |
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) |
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Governor(name_) |
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GovernorSettings(votingDelay_, votingPeriod_, 0) |
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GovernorVotes(token_) |
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GovernorPreventLateQuorum(voteExtension_) |
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{ |
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_quorum = quorum_; |
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} |
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function quorum(uint256) public view virtual override returns (uint256) { |
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return _quorum; |
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} |
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function proposalDeadline(uint256 proposalId) |
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public |
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view |
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virtual |
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override(Governor, GovernorPreventLateQuorum) |
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returns (uint256) |
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{ |
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return super.proposalDeadline(proposalId); |
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} |
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function proposalThreshold() public view virtual override(Governor, GovernorSettings) returns (uint256) { |
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return super.proposalThreshold(); |
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} |
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function _castVote( |
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uint256 proposalId, |
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address account, |
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uint8 support, |
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string memory reason |
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) internal virtual override(Governor, GovernorPreventLateQuorum) returns (uint256) { |
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return super._castVote(proposalId, account, support, reason); |
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} |
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} |
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@ -0,0 +1 @@ |
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Contract presets are now deprecated in favor of [Contracts Wizard](https://wizard.openzeppelin.com/) as a more powerful alternative. |
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@ -0,0 +1 @@ |
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Contract presets are now deprecated in favor of [Contracts Wizard](https://wizard.openzeppelin.com/) as a more powerful alternative. |
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