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111 lines
3.5 KiB
Solidity
111 lines
3.5 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts v4.4.1 (governance/extensions/GovernorSettings.sol)
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pragma solidity ^0.8.0;
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import "../Governor.sol";
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/**
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* @dev Extension of {Governor} for settings updatable through governance.
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*
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* _Available since v4.4._
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*/
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abstract contract GovernorSettings is Governor {
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uint256 private _votingDelay;
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uint256 private _votingPeriod;
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uint256 private _proposalThreshold;
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event VotingDelaySet(uint256 oldVotingDelay, uint256 newVotingDelay);
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event VotingPeriodSet(uint256 oldVotingPeriod, uint256 newVotingPeriod);
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event ProposalThresholdSet(uint256 oldProposalThreshold, uint256 newProposalThreshold);
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/**
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* @dev Initialize the governance parameters.
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*/
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constructor(uint256 initialVotingDelay, uint256 initialVotingPeriod, uint256 initialProposalThreshold) {
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_setVotingDelay(initialVotingDelay);
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_setVotingPeriod(initialVotingPeriod);
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_setProposalThreshold(initialProposalThreshold);
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}
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/**
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* @dev See {IGovernor-votingDelay}.
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*/
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function votingDelay() public view virtual override returns (uint256) {
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return _votingDelay;
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}
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/**
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* @dev See {IGovernor-votingPeriod}.
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*/
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function votingPeriod() public view virtual override returns (uint256) {
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return _votingPeriod;
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}
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/**
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* @dev See {Governor-proposalThreshold}.
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*/
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function proposalThreshold() public view virtual override returns (uint256) {
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return _proposalThreshold;
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}
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/**
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* @dev Update the voting delay. This operation can only be performed through a governance proposal.
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*
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* Emits a {VotingDelaySet} event.
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*/
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function setVotingDelay(uint256 newVotingDelay) public virtual onlyGovernance {
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_setVotingDelay(newVotingDelay);
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}
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/**
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* @dev Update the voting period. This operation can only be performed through a governance proposal.
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*
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* Emits a {VotingPeriodSet} event.
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*/
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function setVotingPeriod(uint256 newVotingPeriod) public virtual onlyGovernance {
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_setVotingPeriod(newVotingPeriod);
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}
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/**
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* @dev Update the proposal threshold. This operation can only be performed through a governance proposal.
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*
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* Emits a {ProposalThresholdSet} event.
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*/
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function setProposalThreshold(uint256 newProposalThreshold) public virtual onlyGovernance {
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_setProposalThreshold(newProposalThreshold);
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}
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/**
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* @dev Internal setter for the voting delay.
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*
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* Emits a {VotingDelaySet} event.
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*/
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function _setVotingDelay(uint256 newVotingDelay) internal virtual {
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emit VotingDelaySet(_votingDelay, newVotingDelay);
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_votingDelay = newVotingDelay;
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}
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/**
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* @dev Internal setter for the voting period.
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*
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* Emits a {VotingPeriodSet} event.
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*/
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function _setVotingPeriod(uint256 newVotingPeriod) internal virtual {
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// voting period must be at least one block long
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require(newVotingPeriod > 0, "GovernorSettings: voting period too low");
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emit VotingPeriodSet(_votingPeriod, newVotingPeriod);
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_votingPeriod = newVotingPeriod;
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}
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/**
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* @dev Internal setter for the proposal threshold.
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*
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* Emits a {ProposalThresholdSet} event.
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*/
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function _setProposalThreshold(uint256 newProposalThreshold) internal virtual {
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emit ProposalThresholdSet(_proposalThreshold, newProposalThreshold);
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_proposalThreshold = newProposalThreshold;
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}
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}
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