440 lines
17 KiB
Solidity
440 lines
17 KiB
Solidity
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/* solium-disable security/no-block-members */
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/* solium-disable security/no-inline-assembly */
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pragma solidity >=0.5.0 <0.6.0;
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import "./StakingPool.sol";
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import "./common/Controlled.sol";
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import "@openzeppelin/contracts/drafts/ERC20Snapshot.sol";
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import "@openzeppelin/contracts/GSN/GSNRecipient.sol";
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import "@openzeppelin/contracts/GSN/IRelayHub.sol";
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contract StakingPoolDAO is StakingPool, GSNRecipient, ERC20Snapshot, Controlled {
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enum VoteStatus {NONE, YES, NO}
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struct Proposal {
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address destination;
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uint value;
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bool executed;
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uint snapshotId;
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uint voteEndingBlock;
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bytes data;
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bytes details; // Store proposal information here
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mapping(bool => uint) votes;
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mapping(address => VoteStatus) voters;
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mapping(bool => uint) cancelVotes;
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mapping(address => VoteStatus) cancelVoters;
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}
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uint public proposalCount;
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mapping(uint => Proposal) public proposals;
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uint public proposalVoteLength; // Voting available during this period
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uint public proposalExpirationLength; // Proposals should be executed up to some time after they have ended
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uint public proposalCancelLength; // Voting for canceling a proposal can be done up to some time after the approval was done
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uint public minimumParticipation; // Minimum participation percentage with 2 decimals. 10000 == 100.00
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uint public minimumParticipationForCancel; // Minimum participation percentage with 2 decimals. Required to consider the call for cancel
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uint public minimumCancelApprovalPercentage; // Minimum percentage to consider a approved proposal as canceled. Uses 2 decimals
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event NewProposal(uint indexed proposalId);
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event Vote(uint indexed proposalId, address indexed voter, VoteStatus indexed choice);
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event CancelVote(uint indexed proposalId, address indexed voter, VoteStatus indexed choice);
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event Execution(uint indexed proposalId);
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event ExecutionFailure(uint indexed proposalId);
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/**
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* @dev constructor
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* @param _tokenAddress SNT token address
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* @param _stakingPeriodLen Length in blocks for the period where user will be able to stake SNT
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* @param _proposalVoteLength Length in blocks for the period where voting will be available for proposals
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* @param _proposalCancelLength Length in blocks for the period where a proposal can be voted for cancel
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* @param _proposalExpirationLength Length in blocks where a proposal must be executed after voting before it is considered expired
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* @param _minimumParticipation Percentage of participation required for a proposal to be considered valid
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* @param _minimumParticipationForCancel Percentage of participation required for a proposal to be considered canceled
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* @param _minimumCancelApprovalPercentage Cancel votes should reach this percentage of the votes done in the cancel period for a proposal to be considered canceled
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*/
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constructor (
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address _tokenAddress,
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uint _stakingPeriodLen,
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uint _proposalVoteLength,
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uint _proposalCancelLength,
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uint _proposalExpirationLength,
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uint _minimumParticipation,
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uint _minimumParticipationForCancel,
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uint _minimumCancelApprovalPercentage
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) public
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StakingPool(_tokenAddress, _stakingPeriodLen) {
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proposalVoteLength = _proposalVoteLength;
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proposalCancelLength = _proposalCancelLength;
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proposalExpirationLength = _proposalExpirationLength;
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minimumParticipation = _minimumParticipation;
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minimumParticipationForCancel = _minimumParticipationForCancel;
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minimumCancelApprovalPercentage = _minimumCancelApprovalPercentage;
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}
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/**
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* @dev Set voting period length in blocks. Can only be executed by the contract's controller
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* @param _newProposalVoteLength Length in blocks for the period where voting will be available for proposals
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*/
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function setProposalVoteLength(uint _newProposalVoteLength) public onlyController {
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proposalVoteLength = _newProposalVoteLength;
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}
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/**
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* @dev Set length in blocks where a proposal can be voted for cancel. Can only be executed by the contract's controller
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* @param _proposalCancelLength Length in blocks where a proposal can be voted for cancel
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*/
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function setProposalCancelLength(uint _proposalCancelLength) public onlyController {
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proposalCancelLength = _proposalCancelLength;
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}
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/**
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* @dev Set length in blocks where a proposal must be executed before it is considered as expired. Can only be executed by the contract's controller
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* @param _newProposalExpirationLength Length in blocks where a proposal must be executed after voting before it is considered expired
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*/
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function setProposalExpirationLength(uint _newProposalExpirationLength) public onlyController {
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proposalExpirationLength = _newProposalExpirationLength;
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}
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/**
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* @dev Set minimum participation percentage for proposals to be considered valid. Can only be executed by the contract's controller
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* @param _newMinimumParticipation Percentage of participation required for a proposal to be considered valid
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*/
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function setMinimumParticipation(uint _newMinimumParticipation) public onlyController {
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minimumParticipation = _newMinimumParticipation;
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}
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/**
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* @dev Set minimum participation percentage for cancels to be considered valid. Can only be executed by the contract's controller
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* @param _minimumParticipationForCancel Percentage of participation required for a proposal to be considered valid
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*/
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function setMinimumParticipationForCancel(uint _minimumParticipationForCancel) public onlyController {
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minimumParticipationForCancel = _minimumParticipationForCancel;
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}
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/**
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* @dev Set minimum percentage of votes for a proposal to be considered canceled
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* @param _minimumCancelApprovalPercentage Cancel votes should reach this percentage of the votes done in the cancel period for a proposal to be considered canceled */
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function setMinimumCancelApprovalPercentage(uint _minimumCancelApprovalPercentage) public onlyController {
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minimumCancelApprovalPercentage = _minimumCancelApprovalPercentage;
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}
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/**
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* @notice Adds a new proposal
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* @param _destination Transaction target address
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* @param _value Transaction ether value
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* @param _data Transaction data payload
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* @param _details Proposal details
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* @return Returns proposal ID
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*/
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function addProposal(address _destination, uint _value, bytes calldata _data, bytes calldata _details) external returns (uint proposalId)
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{
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require(balanceOf(msg.sender) > 0, "Token balance is required to perform this operation");
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assert(_destination != address(0));
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proposalId = proposalCount;
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proposals[proposalId] = Proposal({
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destination: _destination,
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value: _value,
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data: _data,
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executed: false,
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snapshotId: snapshot(),
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details: _details,
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voteEndingBlock: block.number + proposalVoteLength
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});
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proposalCount++;
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emit NewProposal(proposalId);
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}
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/**
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* @notice Vote for a proposal
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* @param _proposalId Id of the proposal to vote
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* @param _choice True for voting yes, False for no
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*/
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function vote(uint _proposalId, bool _choice) external {
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Proposal storage proposal = proposals[_proposalId];
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require(proposal.voteEndingBlock > block.number, "Proposal voting has already ended");
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address sender = _msgSender();
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uint voterBalance = balanceOfAt(sender, proposal.snapshotId);
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require(voterBalance > 0, "Not enough tokens at the moment of proposal creation");
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VoteStatus oldVote = proposal.voters[sender];
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if(oldVote != VoteStatus.NONE){ // Reset
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bool oldChoice = oldVote == VoteStatus.YES ? true : false;
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proposal.votes[oldChoice] -= voterBalance;
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}
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VoteStatus enumVote = _choice ? VoteStatus.YES : VoteStatus.NO;
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proposal.votes[_choice] += voterBalance;
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proposal.voters[sender] = enumVote;
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lastActivity[sender] = block.timestamp;
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emit Vote(_proposalId, sender, enumVote);
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}
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/**
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* @notice Vote to cancel a proposal
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* @param _proposalId Id of the proposal to vote
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* @param _choice True for voting yes, False for no
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*/
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function cancel(uint _proposalId, bool _choice) external {
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Proposal storage proposal = proposals[_proposalId];
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require(proposal.voteEndingBlock + proposalCancelLength > block.number, "Proposal cancel period has already ended");
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require(proposal.voteEndingBlock <= block.number, "Proposal cancel period has not started yet");
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address sender = _msgSender();
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uint voterBalance = balanceOfAt(sender, proposal.snapshotId);
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require(voterBalance > 0, "Not enough tokens at the moment of proposal creation");
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VoteStatus oldVote = proposal.cancelVoters[sender];
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if(oldVote != VoteStatus.NONE){ // Reset
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bool oldChoice = oldVote == VoteStatus.YES ? true : false;
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proposal.cancelVotes[oldChoice] -= voterBalance;
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}
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VoteStatus enumVote = _choice ? VoteStatus.YES : VoteStatus.NO;
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proposal.cancelVotes[_choice] += voterBalance;
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proposal.cancelVoters[sender] = enumVote;
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lastActivity[sender] = block.timestamp;
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emit CancelVote(_proposalId, sender, enumVote);
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}
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/**
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* @dev Execute a transaction
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* @param _destination Transaction target address.
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* @param _value Transaction ether value.
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* @param _dataLength Transaction data payload length
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* @param _data Transaction data payload.
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*/
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function external_call(address _destination, uint _value, uint _dataLength, bytes memory _data) internal returns (bool) {
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bool result;
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assembly {
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let x := mload(0x40) // "Allocate" memory for output (0x40 is where "free memory" pointer is stored by convention)
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let d := add(_data, 32) // First 32 bytes are the padded length of data, so exclude that
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result := call(
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sub(gas, 34710), // 34710 is the value that solidity is currently emitting
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// It includes callGas (700) + callVeryLow (3, to pay for SUB) + callValueTransferGas (9000) +
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// callNewAccountGas (25000, in case the destination address does not exist and needs creating)
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_destination,
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_value,
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d,
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_dataLength, // Size of the input (in bytes) - this is what fixes the padding problem
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x,
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0 // Output is ignored, therefore the output size is zero
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)
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}
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return result;
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}
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/**
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* @notice Execute an approved non-expired proposal
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* @param _proposalId Proposal ID.
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*/
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function executeTransaction(uint _proposalId) public {
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Proposal storage proposal = proposals[_proposalId];
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require(proposal.executed == false, "Proposal already executed");
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require(block.number > proposal.voteEndingBlock + proposalCancelLength, "Voting is still active");
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require(block.number <= proposal.voteEndingBlock + proposalCancelLength + proposalExpirationLength, "Proposal is already expired");
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require(proposal.votes[true] > proposal.votes[false], "Proposal wasn't approved");
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uint totalParticipation = ((proposal.votes[true] + proposal.votes[false]) * 10000) / totalSupply();
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require(totalParticipation >= minimumParticipation, "Did not meet the minimum required participation");
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require(!_isCancelled(proposal), "Proposal was canceled");
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proposal.executed = true;
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bool result = external_call(proposal.destination, proposal.value, proposal.data.length, proposal.data);
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require(result, "Execution Failed");
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emit Execution(_proposalId);
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}
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function _isCancelled(Proposal storage proposal) internal view returns(bool) {
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uint totalCancelVotes = proposal.cancelVotes[true] + proposal.cancelVotes[false];
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uint totalCancelParticipation = (totalCancelVotes * 10000) / totalSupply();
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if(totalCancelVotes > 0){
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uint cancelApprovalPercentage = (proposal.cancelVotes[true] * 10000) / totalCancelVotes;
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return totalCancelParticipation >= minimumParticipationForCancel && cancelApprovalPercentage >= minimumCancelApprovalPercentage;
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}
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return false;
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}
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/**
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* @notice Get the number of votes for a proposal choice
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* @param _proposalId Proposal ID
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* @param _choice True for voting yes, False for no
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* @return Number of votes for the selected choice
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*/
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function votes(uint _proposalId, bool _choice) public view returns (uint) {
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return proposals[_proposalId].votes[_choice];
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}
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/**
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* @notice Get the vote of an account
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* @param _account Account to obtain the vote from
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* @param _proposalId Proposal ID
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* @return Vote cast by an account
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*/
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function voteOf(address _account, uint _proposalId) public view returns (VoteStatus) {
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return proposals[_proposalId].voters[_account];
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}
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/**
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* @notice Check proposal status
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* @param _proposalId Proposal ID
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* @return approved Indicates if the proposal was approved or not
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* @return executed Indicates if the proposal was executed or not
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* @return canceled Indicates if the proposal was canceled or not
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*/
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function proposalStatus(uint _proposalId) public view returns (bool approved, bool canceled, bool executed){
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Proposal storage proposal = proposals[_proposalId];
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uint totalParticipation = ((proposal.votes[true] + proposal.votes[false]) * 10000) / totalSupply();
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if(block.number <= proposal.voteEndingBlock || totalParticipation < minimumParticipation) {
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approved = false;
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} else {
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approved = proposal.votes[true] > proposal.votes[false];
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}
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canceled = block.number > proposal.voteEndingBlock + proposalCancelLength && _isCancelled(proposal);
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executed = proposal.executed;
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}
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function() external payable {
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//
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}
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// ========================================================================
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// Gas station network
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enum GSNErrorCodes {
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FUNCTION_NOT_AVAILABLE,
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HAS_ETH_BALANCE,
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GAS_PRICE,
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TRX_TOO_SOON,
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ALREADY_VOTED,
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NO_TOKEN_BALANCE
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}
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bytes4 constant VOTE_SIGNATURE = bytes4(keccak256("vote(uint256,bool)"));
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bytes4 constant CANCEL_SIGNATURE = bytes4(keccak256("cancel(uint256,bool)"));
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/**
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* @dev Function returning if we accept or not the relayed call (do we pay or not for the gas)
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* @param from Address of the buyer getting a free transaction
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* @param encodedFunction Function that will be called on the Escrow contract
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* @param gasPrice Gas price
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* @dev relay and transaction_fee are useless in our relay workflow
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*/
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function acceptRelayedCall(
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address /*relay*/,
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address from,
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bytes calldata encodedFunction,
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uint256 /*transactionFee*/,
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uint256 gasPrice,
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uint256 /*gasLimit*/,
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uint256 /*nonce*/,
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bytes calldata /*approvalData*/,
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uint256 /*maxPossibleCharge*/
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) external view returns (uint256, bytes memory) {
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bytes memory abiEncodedFunc = encodedFunction; // Call data elements cannot be accessed directly
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bytes4 functionSignature;
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uint proposalId;
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assembly {
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functionSignature := mload(add(abiEncodedFunc, add(0x20, 0)))
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proposalId := mload(add(abiEncodedFunc, 36))
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}
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return _evaluateConditions(from, functionSignature, proposalId, gasPrice);
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}
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/**
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* @dev Evaluates if the sender conditions are valid for relaying a escrow transaction
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* @param _from Sender
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* @param _gasPrice Gas Price
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* @param _functionSignature Function Signature
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* @param _proposalId Proposal ID
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*/
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function _evaluateConditions(
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address _from,
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bytes4 _functionSignature,
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uint _proposalId,
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uint _gasPrice
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) internal view returns (uint256, bytes memory) {
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if(_functionSignature != VOTE_SIGNATURE || _functionSignature != CANCEL_SIGNATURE) return _rejectRelayedCall(uint256(GSNErrorCodes.FUNCTION_NOT_AVAILABLE));
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Proposal storage proposal = proposals[_proposalId];
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if(balanceOfAt(_from, proposal.snapshotId) == 0) return _rejectRelayedCall(uint256(GSNErrorCodes.NO_TOKEN_BALANCE));
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if(_gasPrice > 20000000000) return _rejectRelayedCall(uint256(GSNErrorCodes.GAS_PRICE)); // 20 gwei
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if((lastActivity[_from] + 15 minutes) > block.timestamp) return _rejectRelayedCall(uint256(GSNErrorCodes.TRX_TOO_SOON));
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if(proposal.voters[_from] != VoteStatus.NONE) return _rejectRelayedCall(uint256(GSNErrorCodes.ALREADY_VOTED));
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return _approveRelayedCall();
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}
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mapping(address => uint) public lastActivity;
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/**
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* @dev Function executed before the relay. Unused by us
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*/
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function _preRelayedCall(bytes memory context) internal returns (bytes32) {
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}
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/**
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* @dev Function executed after the relay. Unused by us
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*/
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function _postRelayedCall(bytes memory context, bool, uint256 actualCharge, bytes32) internal {
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}
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/**
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* @notice Withdraw the ETH used for relay trxs
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* @dev Only contract owner can execute this function
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*/
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function withdraw() external onlyController {
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IRelayHub rh = IRelayHub(getHubAddr());
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uint balance = rh.balanceOf(address(this));
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_withdrawDeposits(balance, msg.sender);
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}
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/**
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* @notice Set gas station network hub address
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* @dev Only contract owner can execute this function
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* @param _relayHub New relay hub address
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*/
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function setRelayHubAddress(address _relayHub) external onlyController {
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_upgradeRelayHub(_relayHub);
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}
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}
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