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Add Governor module for governance-settable parameters (#2904)
Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
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| // SPDX-License-Identifier: MIT | ||
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| pragma solidity ^0.8.0; | ||
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| import "../Governor.sol"; | ||
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| /** | ||
| * @dev Extension of {Governor} for settings updatable through governance. | ||
| * | ||
| * _Available since v4.4._ | ||
| */ | ||
| abstract contract GovernorSettings is Governor { | ||
| uint256 private _votingDelay; | ||
| uint256 private _votingPeriod; | ||
| uint256 private _proposalThreshold; | ||
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| event VotingDelaySet(uint256 oldVotingDelay, uint256 newVotingDelay); | ||
| event VotingPeriodSet(uint256 oldVotingPeriod, uint256 newVotingPeriod); | ||
| event ProposalThresholdSet(uint256 oldProposalThreshold, uint256 newProposalThreshold); | ||
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| /** | ||
| * @dev Initialize the governance parameters. | ||
| */ | ||
| constructor( | ||
| uint256 initialVotingDelay, | ||
| uint256 initialVotingPeriod, | ||
| uint256 initialProposalThreshold | ||
| ) { | ||
| _setVotingDelay(initialVotingDelay); | ||
| _setVotingPeriod(initialVotingPeriod); | ||
| _setProposalThreshold(initialProposalThreshold); | ||
| } | ||
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| /** | ||
| * @dev See {IGovernor-votingDelay}. | ||
| */ | ||
| function votingDelay() public view virtual override returns (uint256) { | ||
| return _votingDelay; | ||
| } | ||
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| /** | ||
| * @dev See {IGovernor-votingPeriod}. | ||
| */ | ||
| function votingPeriod() public view virtual override returns (uint256) { | ||
| return _votingPeriod; | ||
| } | ||
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| /** | ||
| * @dev See {Governor-proposalThreshold}. | ||
| */ | ||
| function proposalThreshold() public view virtual override returns (uint256) { | ||
| return _proposalThreshold; | ||
| } | ||
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| /** | ||
| * @dev Update the voting delay. This operation can only be performed through a governance proposal. | ||
| * | ||
| * Emits a {VotingDelaySet} event. | ||
| */ | ||
| function setVotingDelay(uint256 newVotingDelay) public onlyGovernance { | ||
| _setVotingDelay(newVotingDelay); | ||
| } | ||
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| /** | ||
| * @dev Update the voting period. This operation can only be performed through a governance proposal. | ||
| * | ||
| * Emits a {VotingPeriodSet} event. | ||
| */ | ||
| function setVotingPeriod(uint256 newVotingPeriod) public onlyGovernance { | ||
| _setVotingPeriod(newVotingPeriod); | ||
| } | ||
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| /** | ||
| * @dev Update the proposal threshold. This operation can only be performed through a governance proposal. | ||
| * | ||
| * Emits a {ProposalThresholdSet} event. | ||
| */ | ||
| function setProposalThreshold(uint256 newProposalThreshold) public onlyGovernance { | ||
| _setProposalThreshold(newProposalThreshold); | ||
| } | ||
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| /** | ||
| * @dev Internal setter for the the voting delay. | ||
| * | ||
| * Emits a {VotingDelaySet} event. | ||
| */ | ||
| function _setVotingDelay(uint256 newVotingDelay) internal virtual { | ||
| emit VotingDelaySet(_votingDelay, newVotingDelay); | ||
| _votingDelay = newVotingDelay; | ||
| } | ||
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| /** | ||
| * @dev Internal setter for the the voting period. | ||
| * | ||
| * Emits a {VotingPeriodSet} event. | ||
| */ | ||
| function _setVotingPeriod(uint256 newVotingPeriod) internal virtual { | ||
| // voting period must be at least one block long | ||
| require(newVotingPeriod > 0, "GovernorSettings: voting period too low"); | ||
| emit VotingPeriodSet(_votingPeriod, newVotingPeriod); | ||
| _votingPeriod = newVotingPeriod; | ||
| } | ||
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| /** | ||
| * @dev Internal setter for the the proposal threshold. | ||
| * | ||
| * Emits a {ProposalThresholdSet} event. | ||
| */ | ||
| function _setProposalThreshold(uint256 newProposalThreshold) internal virtual { | ||
| emit ProposalThresholdSet(_proposalThreshold, newProposalThreshold); | ||
| _proposalThreshold = newProposalThreshold; | ||
| } | ||
| } |
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