Address Details
contract
0x5B2C9E7932B08D8F2Ce70ef9E5c98528256f9aB4
- Contract Name
- GrandaMento
- Creator
- 0xf3eb91–a79239 at 0xdbefeb–706500
- Balance
- 0 CELO ( )
- Locked CELO Balance
- 0.00 CELO
- Voting CELO Balance
- 0.00 CELO
- Pending Unlocked Gold
- 0.00 CELO
- Tokens
-
Fetching tokens...
- Transactions
- 0 Transactions
- Transfers
- 0 Transfers
- Gas Used
- Fetching gas used...
- Last Balance Update
- 10405323
This contract has been verified via Sourcify.
View contract in Sourcify repository
- Contract name:
- GrandaMento
- Optimization enabled
- false
- Compiler version
- v0.5.13+commit.5b0b510c
- EVM Version
- istanbul
- Verified at
- 2021-09-23T21:03:20.904288Z
Contract source code
pragma solidity ^0.5.13; import "openzeppelin-solidity/contracts/math/SafeMath.sol"; import "openzeppelin-solidity/contracts/ownership/Ownable.sol"; import "../common/FixidityLib.sol"; import "../common/Initializable.sol"; import "../common/UsingRegistry.sol"; import "../common/interfaces/ICeloVersionedContract.sol"; import "../common/libraries/ReentrancyGuard.sol"; import "../stability/interfaces/IStableToken.sol"; /** * @title Facilitates large exchanges between CELO stable tokens. */ contract GrandaMento is ICeloVersionedContract, Ownable, Initializable, UsingRegistry, ReentrancyGuard { using FixidityLib for FixidityLib.Fraction; using SafeMath for uint256; // Emitted when a new exchange proposal is created. event ExchangeProposalCreated( uint256 indexed proposalId, address indexed exchanger, string stableTokenRegistryId, uint256 sellAmount, uint256 buyAmount, bool sellCelo ); // Emitted when an exchange proposal is approved by the approver. event ExchangeProposalApproved(uint256 indexed proposalId); // Emitted when an exchange proposal is cancelled. event ExchangeProposalCancelled(uint256 indexed proposalId); // Emitted when an exchange proposal is executed. event ExchangeProposalExecuted(uint256 indexed proposalId); // Emitted when the approver is set. event ApproverSet(address approver); // Emitted when maxApprovalExchangeRateChange is set. event MaxApprovalExchangeRateChangeSet(uint256 maxApprovalExchangeRateChange); // Emitted when the spread is set. event SpreadSet(uint256 spread); // Emitted when the veto period in seconds is set. event VetoPeriodSecondsSet(uint256 vetoPeriodSeconds); // Emitted when the exchange limits for a stable token are set. event StableTokenExchangeLimitsSet( string stableTokenRegistryId, uint256 minExchangeAmount, uint256 maxExchangeAmount ); enum ExchangeProposalState { None, Proposed, Approved, Executed, Cancelled } struct ExchangeLimits { // The minimum amount of an asset that can be exchanged in a single proposal. uint256 minExchangeAmount; // The maximum amount of an asset that can be exchanged in a single proposal. uint256 maxExchangeAmount; } struct ExchangeProposal { // The exchanger/proposer of the exchange proposal. address payable exchanger; // The stable token involved in this proposal. This is stored rather than // the stable token's registry ID in case the contract address is changed // after a proposal is created, which could affect refunding or burning the // stable token. address stableToken; // The state of the exchange proposal. ExchangeProposalState state; // Whether the exchanger is selling CELO and buying stableToken. bool sellCelo; // The amount of the sell token being sold. If a stable token is being sold, // the amount of stable token in "units" is stored rather than the "value." // This is because stable tokens may experience demurrage/inflation, where // the amount of stable token "units" doesn't change with time, but the "value" // does. This is important to ensure the correct inflation-adjusted amount // of the stable token is transferred out of this contract when a deposit is // refunded or an exchange selling the stable token is executed. // See StableToken.sol for more details on what "units" vs "values" are. uint256 sellAmount; // The amount of the buy token being bought. For stable tokens, this is // kept track of as the value, not units. uint256 buyAmount; // The price of CELO quoted in stableToken at the time of the exchange proposal // creation. This is the price used to calculate the buyAmount. Used for a // safety check when an approval is being made that the price isn't wildly // different. Recalculating buyAmount is not sufficient because if a stable token // is being sold that has demurrage enabled, the original value when the stable // tokens were deposited cannot be calculated. uint256 celoStableTokenExchangeRate; // The veto period in seconds at the time the proposal was created. This is kept // track of on a per-proposal basis to lock-in the veto period for a proposal so // that changes to the contract's vetoPeriodSeconds do not affect existing // proposals. uint256 vetoPeriodSeconds; // The timestamp (`block.timestamp`) at which the exchange proposal was approved // in seconds. If the exchange proposal has not ever been approved, is 0. uint256 approvalTimestamp; } // The address with the authority to approve exchange proposals. address public approver; // The maximum allowed change in the CELO/stable token price when an exchange proposal // is being approved relative to the rate when the exchange proposal was created. FixidityLib.Fraction public maxApprovalExchangeRateChange; // The percent fee imposed upon an exchange execution. FixidityLib.Fraction public spread; // The period in seconds after an approval during which an exchange proposal can be vetoed. uint256 public vetoPeriodSeconds; // The minimum and maximum amount of the stable token that can be minted or // burned in a single exchange. Indexed by the stable token registry identifier string. mapping(string => ExchangeLimits) public stableTokenExchangeLimits; // State for all exchange proposals. Indexed by the exchange proposal ID. mapping(uint256 => ExchangeProposal) public exchangeProposals; // An array containing a superset of the IDs of exchange proposals that are currently // in the Proposed or Approved state. Intended to allow easy viewing of all active // exchange proposals. It's possible for a proposal ID in this array to no longer be // active, so filtering is required to find the true set of active proposal IDs. // A superset is kept because exchange proposal vetoes, intended to be done // by Governance, effectively go through a multi-day timelock. If the veto // call was required to provide the index in an array of activeProposalIds to // remove corresponding to the vetoed exchange proposal, the timelock could result // in the provided index being stale by the time the veto would be executed. // Alternative approaches exist, like maintaining a linkedlist of active proposal // IDs, but this approach was chosen for its low implementation complexity. uint256[] public activeProposalIdsSuperset; // Number of exchange proposals that have ever been created. Used for assigning // an exchange proposal ID to a new proposal. uint256 public exchangeProposalCount; /** * @notice Reverts if the sender is not the approver. */ modifier onlyApprover() { require(msg.sender == approver, "Sender must be approver"); _; } /** * @notice Sets initialized == true on implementation contracts. * @param test Set to true to skip implementation initialization. */ constructor(bool test) public Initializable(test) {} /** * @notice Returns the storage, major, minor, and patch version of the contract. * @return The storage, major, minor, and patch version of the contract. */ function getVersionNumber() external pure returns (uint256, uint256, uint256, uint256) { return (1, 1, 0, 0); } /** * @notice Used in place of the constructor to allow the contract to be upgradable via proxy. * @param _registry The address of the registry. * @param _approver The approver that has the ability to approve exchange proposals. * @param _maxApprovalExchangeRateChange The maximum allowed change in CELO price * between an exchange proposal's creation and approval. * @param _spread The spread charged on exchanges. * @param _vetoPeriodSeconds The length of the veto period in seconds. */ function initialize( address _registry, address _approver, uint256 _maxApprovalExchangeRateChange, uint256 _spread, uint256 _vetoPeriodSeconds ) external initializer { _transferOwnership(msg.sender); setRegistry(_registry); setApprover(_approver); setMaxApprovalExchangeRateChange(_maxApprovalExchangeRateChange); setSpread(_spread); setVetoPeriodSeconds(_vetoPeriodSeconds); } /** * @notice Creates a new exchange proposal and deposits the tokens being sold. * @dev Stable token value amounts are used for the sellAmount, not unit amounts. * @param stableTokenRegistryId The string registry ID for the stable token * involved in the exchange. * @param sellAmount The amount of the sell token being sold. * @param sellCelo Whether CELO is being sold. * @return The proposal identifier for the newly created exchange proposal. */ function createExchangeProposal( string calldata stableTokenRegistryId, uint256 sellAmount, bool sellCelo ) external nonReentrant returns (uint256) { address stableToken = registry.getAddressForStringOrDie(stableTokenRegistryId); // Gets the price of CELO quoted in stableToken. uint256 celoStableTokenExchangeRate = getOracleExchangeRate(stableToken).unwrap(); // Using the current oracle exchange rate, calculate what the buy amount is. // This takes the spread into consideration. uint256 buyAmount = getBuyAmount(celoStableTokenExchangeRate, sellAmount, sellCelo); // Create new scope to prevent a stack too deep error. { // Get the minimum and maximum amount of stable token than can be involved // in the exchange. This reverts if exchange limits for the stable token have // not been set. (uint256 minExchangeAmount, uint256 maxExchangeAmount) = getStableTokenExchangeLimits( stableTokenRegistryId ); // Ensure that the amount of stableToken being bought or sold is within // the configurable exchange limits. uint256 stableTokenExchangeAmount = sellCelo ? buyAmount : sellAmount; require( stableTokenExchangeAmount <= maxExchangeAmount && stableTokenExchangeAmount >= minExchangeAmount, "Stable token exchange amount not within limits" ); } // Deposit the assets being sold. IERC20 sellToken = sellCelo ? getGoldToken() : IERC20(stableToken); require( sellToken.transferFrom(msg.sender, address(this), sellAmount), "Transfer in of sell token failed" ); // Record the proposal. // Add 1 to the running proposal count, and use the updated proposal count as // the proposal ID. Proposal IDs intentionally start at 1. exchangeProposalCount = exchangeProposalCount.add(1); // For stable tokens, the amount is stored in units to deal with demurrage. uint256 storedSellAmount = sellCelo ? sellAmount : IStableToken(stableToken).valueToUnits(sellAmount); exchangeProposals[exchangeProposalCount] = ExchangeProposal({ exchanger: msg.sender, stableToken: stableToken, state: ExchangeProposalState.Proposed, sellCelo: sellCelo, sellAmount: storedSellAmount, buyAmount: buyAmount, celoStableTokenExchangeRate: celoStableTokenExchangeRate, vetoPeriodSeconds: vetoPeriodSeconds, approvalTimestamp: 0 // initial value when not approved yet }); // StableToken.unitsToValue (called within getSellTokenAndSellAmount) can // overflow for very large StableToken amounts. Call it here as a sanity // check, so that the overflow happens here, blocking proposal creation // rather than when attempting to execute the proposal, which would lock // funds in this contract. getSellTokenAndSellAmount(exchangeProposals[exchangeProposalCount]); // Push it into the array of active proposals. activeProposalIdsSuperset.push(exchangeProposalCount); // Even if stable tokens are being sold, the sellAmount emitted is the "value." emit ExchangeProposalCreated( exchangeProposalCount, msg.sender, stableTokenRegistryId, sellAmount, buyAmount, sellCelo ); return exchangeProposalCount; } /** * @notice Approves an existing exchange proposal. * @dev Sender must be the approver. Exchange proposal must be in the Proposed state. * @param proposalId The identifier of the proposal to approve. */ function approveExchangeProposal(uint256 proposalId) external nonReentrant onlyApprover { ExchangeProposal storage proposal = exchangeProposals[proposalId]; // Ensure the proposal is in the Proposed state. require(proposal.state == ExchangeProposalState.Proposed, "Proposal must be in Proposed state"); // Ensure the change in the current price of CELO quoted in the stable token // relative to the value when the proposal was created is within the allowed limit. FixidityLib.Fraction memory currentRate = getOracleExchangeRate(proposal.stableToken); FixidityLib.Fraction memory proposalRate = FixidityLib.wrap( proposal.celoStableTokenExchangeRate ); (FixidityLib.Fraction memory lesserRate, FixidityLib.Fraction memory greaterRate) = currentRate .lt(proposalRate) ? (currentRate, proposalRate) : (proposalRate, currentRate); FixidityLib.Fraction memory rateChange = greaterRate.subtract(lesserRate).divide(proposalRate); require( rateChange.lte(maxApprovalExchangeRateChange), "CELO exchange rate is too different from the proposed price" ); // Set the time the approval occurred and change the state. proposal.approvalTimestamp = block.timestamp; proposal.state = ExchangeProposalState.Approved; emit ExchangeProposalApproved(proposalId); } /** * @notice Cancels an exchange proposal. * @dev Only callable by the exchanger if the proposal is in the Proposed state * or the owner if the proposal is in the Approved state. * @param proposalId The identifier of the proposal to cancel. */ function cancelExchangeProposal(uint256 proposalId) external nonReentrant { ExchangeProposal storage proposal = exchangeProposals[proposalId]; // Require the appropriate state and sender. // This will also revert if a proposalId is given that does not correspond // to a previously created exchange proposal. if (proposal.state == ExchangeProposalState.Proposed) { require(proposal.exchanger == msg.sender, "Sender must be exchanger"); } else if (proposal.state == ExchangeProposalState.Approved) { require(isOwner(), "Sender must be owner"); } else { revert("Proposal must be in Proposed or Approved state"); } // Mark the proposal as cancelled. Do so prior to refunding as a measure against reentrancy. proposal.state = ExchangeProposalState.Cancelled; // Get the token and amount that will be refunded to the proposer. (IERC20 refundToken, uint256 refundAmount) = getSellTokenAndSellAmount(proposal); // Finally, transfer out the deposited funds. require( refundToken.transfer(proposal.exchanger, refundAmount), "Transfer out of refund token failed" ); emit ExchangeProposalCancelled(proposalId); } /** * @notice Executes an exchange proposal that's been approved and not vetoed. * @dev Callable by anyone. Reverts if the proposal is not in the Approved state * or proposal.vetoPeriodSeconds has not elapsed since approval. * @param proposalId The identifier of the proposal to execute. */ function executeExchangeProposal(uint256 proposalId) external nonReentrant { ExchangeProposal storage proposal = exchangeProposals[proposalId]; // Require that the proposal is in the Approved state. require(proposal.state == ExchangeProposalState.Approved, "Proposal must be in Approved state"); // Require that the veto period has elapsed since the approval time. require( proposal.approvalTimestamp.add(proposal.vetoPeriodSeconds) <= block.timestamp, "Veto period not elapsed" ); // Mark the proposal as executed. Do so prior to exchanging as a measure against reentrancy. proposal.state = ExchangeProposalState.Executed; // Perform the exchange. (IERC20 sellToken, uint256 sellAmount) = getSellTokenAndSellAmount(proposal); // If the exchange sells CELO, the CELO is sent to the Reserve from this contract // and stable token is minted to the exchanger. if (proposal.sellCelo) { // Send the CELO from this contract to the reserve. require( sellToken.transfer(address(getReserve()), sellAmount), "Transfer out of CELO to Reserve failed" ); // Mint stable token to the exchanger. require( IStableToken(proposal.stableToken).mint(proposal.exchanger, proposal.buyAmount), "Stable token mint failed" ); } else { // If the exchange is selling stable token, the stable token is burned from // this contract and CELO is transferred from the Reserve to the exchanger. // Burn the stable token from this contract. require(IStableToken(proposal.stableToken).burn(sellAmount), "Stable token burn failed"); // Transfer the CELO from the Reserve to the exchanger. require( getReserve().transferExchangeGold(proposal.exchanger, proposal.buyAmount), "Transfer out of CELO from Reserve failed" ); } emit ExchangeProposalExecuted(proposalId); } /** * @notice Gets the sell token and the sell amount for a proposal. * @dev For stable token sell amounts that are stored as units, the value * is returned. Ensures sell amount is not greater than this contract's balance. * @param proposal The proposal to get the sell token and sell amount for. * @return (the IERC20 sell token, the value sell amount). */ function getSellTokenAndSellAmount(ExchangeProposal memory proposal) private view returns (IERC20, uint256) { IERC20 sellToken; uint256 sellAmount; if (proposal.sellCelo) { sellToken = getGoldToken(); sellAmount = proposal.sellAmount; } else { address stableToken = proposal.stableToken; sellToken = IERC20(stableToken); // When selling stableToken, the sell amount is stored in units. // Units must be converted to value when refunding. sellAmount = IStableToken(stableToken).unitsToValue(proposal.sellAmount); } // In the event a precision issue from the unit <-> value calculations results // in sellAmount being greater than this contract's balance, set the sellAmount // to the entire balance. // This check should not be necessary for CELO, but is done so regardless // for extra certainty that cancelling an exchange proposal can never fail // if for some reason the CELO balance of this contract is less than the // recorded sell amount. uint256 totalBalance = sellToken.balanceOf(address(this)); if (totalBalance < sellAmount) { sellAmount = totalBalance; } return (sellToken, sellAmount); } /** * @notice Using the oracle price, charges the spread and calculates the amount of * the asset being bought. * @dev Stable token value amounts are used for the sellAmount, not unit amounts. * Assumes both CELO and the stable token have 18 decimals. * @param celoStableTokenExchangeRate The unwrapped fraction exchange rate of CELO * quoted in the stable token. * @param sellAmount The amount of the sell token being sold. * @param sellCelo Whether CELO is being sold. * @return The amount of the asset being bought. */ function getBuyAmount(uint256 celoStableTokenExchangeRate, uint256 sellAmount, bool sellCelo) public view returns (uint256) { FixidityLib.Fraction memory exchangeRate = FixidityLib.wrap(celoStableTokenExchangeRate); // If stableToken is being sold, instead use the price of stableToken // quoted in CELO. if (!sellCelo) { exchangeRate = exchangeRate.reciprocal(); } // The sell amount taking the spread into account, ie: // (1 - spread) * sellAmount FixidityLib.Fraction memory adjustedSellAmount = FixidityLib.fixed1().subtract(spread).multiply( FixidityLib.newFixed(sellAmount) ); // Calculate the buy amount: // exchangeRate * adjustedSellAmount return exchangeRate.multiply(adjustedSellAmount).fromFixed(); } /** * @notice Removes the proposal ID found at the provided index of activeProposalIdsSuperset * if the exchange proposal is not active. * @dev Anyone can call. Reverts if the exchange proposal is active. * @param index The index of the proposal ID to remove from activeProposalIdsSuperset. */ function removeFromActiveProposalIdsSuperset(uint256 index) external { require(index < activeProposalIdsSuperset.length, "Index out of bounds"); uint256 proposalId = activeProposalIdsSuperset[index]; // Require the exchange proposal to be inactive. require( exchangeProposals[proposalId].state != ExchangeProposalState.Proposed && exchangeProposals[proposalId].state != ExchangeProposalState.Approved, "Exchange proposal not inactive" ); // If not removing the last element, overwrite the index with the value of // the last element. uint256 lastIndex = activeProposalIdsSuperset.length.sub(1); if (index < lastIndex) { activeProposalIdsSuperset[index] = activeProposalIdsSuperset[lastIndex]; } // Delete the last element. activeProposalIdsSuperset.length--; } /** * @notice Gets the proposal identifiers of exchange proposals in the * Proposed or Approved state. Returns a version of activeProposalIdsSuperset * with inactive proposal IDs set as 0. * @dev Elements with a proposal ID of 0 should be filtered out by the consumer. * @return An array of active exchange proposals IDs. */ function getActiveProposalIds() external view returns (uint256[] memory) { // Solidity doesn't play well with dynamically sized memory arrays. // Instead, this array is created with the same length as activeProposalIdsSuperset, // and will replace elements that are inactive proposal IDs with the value 0. uint256[] memory activeProposalIds = new uint256[](activeProposalIdsSuperset.length); for (uint256 i = 0; i < activeProposalIdsSuperset.length; i = i.add(1)) { uint256 proposalId = activeProposalIdsSuperset[i]; if ( exchangeProposals[proposalId].state == ExchangeProposalState.Proposed || exchangeProposals[proposalId].state == ExchangeProposalState.Approved ) { activeProposalIds[i] = proposalId; } } return activeProposalIds; } /** * @notice Gets the oracle CELO price quoted in the stable token. * @dev Reverts if there is not a rate for the provided stable token. * @param stableToken The stable token to get the oracle price for. * @return The oracle CELO price quoted in the stable token. */ function getOracleExchangeRate(address stableToken) private view returns (FixidityLib.Fraction memory) { uint256 rateNumerator; uint256 rateDenominator; (rateNumerator, rateDenominator) = getSortedOracles().medianRate(stableToken); // When rateDenominator is 0, it means there are no rates known to SortedOracles. require(rateDenominator > 0, "No oracle rates present for token"); return FixidityLib.wrap(rateNumerator).divide(FixidityLib.wrap(rateDenominator)); } /** * @notice Gets the minimum and maximum amount of a stable token that can be * involved in a single exchange. * @dev Reverts if there is no explicit exchange limit for the stable token. * @param stableTokenRegistryId The string registry ID for the stable token. * @return (minimum exchange amount, maximum exchange amount). */ function getStableTokenExchangeLimits(string memory stableTokenRegistryId) public view returns (uint256, uint256) { ExchangeLimits memory exchangeLimits = stableTokenExchangeLimits[stableTokenRegistryId]; // Require the configurable stableToken max exchange amount to be > 0. // This covers the case where a stableToken has never been explicitly permitted. require( exchangeLimits.maxExchangeAmount > 0, "Max stable token exchange amount must be defined" ); return (exchangeLimits.minExchangeAmount, exchangeLimits.maxExchangeAmount); } /** * @notice Sets the approver. * @dev Sender must be owner. New approver is allowed to be address(0). * @param newApprover The new value for the approver. */ function setApprover(address newApprover) public onlyOwner { approver = newApprover; emit ApproverSet(newApprover); } /** * @notice Sets the maximum allowed change in the CELO/stable token price when * an exchange proposal is being approved relative to the price when the proposal * was created. * @dev Sender must be owner. * @param newMaxApprovalExchangeRateChange The new value for maxApprovalExchangeRateChange * to be wrapped. */ function setMaxApprovalExchangeRateChange(uint256 newMaxApprovalExchangeRateChange) public onlyOwner { maxApprovalExchangeRateChange = FixidityLib.wrap(newMaxApprovalExchangeRateChange); emit MaxApprovalExchangeRateChangeSet(newMaxApprovalExchangeRateChange); } /** * @notice Sets the spread. * @dev Sender must be owner. * @param newSpread The new value for the spread to be wrapped. Must be <= fixed 1. */ function setSpread(uint256 newSpread) public onlyOwner { require(newSpread <= FixidityLib.fixed1().unwrap(), "Spread must be smaller than 1"); spread = FixidityLib.wrap(newSpread); emit SpreadSet(newSpread); } /** * @notice Sets the minimum and maximum amount of the stable token an exchange can involve. * @dev Sender must be owner. Setting the maxExchangeAmount to 0 effectively disables new * exchange proposals for the token. * @param stableTokenRegistryId The registry ID string for the stable token to set limits for. * @param minExchangeAmount The new minimum exchange amount for the stable token. * @param maxExchangeAmount The new maximum exchange amount for the stable token. */ function setStableTokenExchangeLimits( string calldata stableTokenRegistryId, uint256 minExchangeAmount, uint256 maxExchangeAmount ) external onlyOwner { require( minExchangeAmount <= maxExchangeAmount, "Min exchange amount must not be greater than max" ); stableTokenExchangeLimits[stableTokenRegistryId] = ExchangeLimits({ minExchangeAmount: minExchangeAmount, maxExchangeAmount: maxExchangeAmount }); emit StableTokenExchangeLimitsSet(stableTokenRegistryId, minExchangeAmount, maxExchangeAmount); } /** * @notice Sets the veto period in seconds. * @dev Sender must be owner. * @param newVetoPeriodSeconds The new value for the veto period in seconds. */ function setVetoPeriodSeconds(uint256 newVetoPeriodSeconds) public onlyOwner { // Hardcode a max of 4 weeks. // A minimum is not enforced for flexibility. A case of interest is if // Governance were to be set as the `approver`, it would be desirable to // set the veto period to 0 seconds. require(newVetoPeriodSeconds <= 4 weeks, "Veto period cannot exceed 4 weeks"); vetoPeriodSeconds = newVetoPeriodSeconds; emit VetoPeriodSecondsSet(newVetoPeriodSeconds); } }
FixidityLib.sol
pragma solidity ^0.5.13; /** * @title FixidityLib * @author Gadi Guy, Alberto Cuesta Canada * @notice This library provides fixed point arithmetic with protection against * overflow. * All operations are done with uint256 and the operands must have been created * with any of the newFrom* functions, which shift the comma digits() to the * right and check for limits, or with wrap() which expects a number already * in the internal representation of a fraction. * When using this library be sure to use maxNewFixed() as the upper limit for * creation of fixed point numbers. * @dev All contained functions are pure and thus marked internal to be inlined * on consuming contracts at compile time for gas efficiency. */ library FixidityLib { struct Fraction { uint256 value; } /** * @notice Number of positions that the comma is shifted to the right. */ function digits() internal pure returns (uint8) { return 24; } uint256 private constant FIXED1_UINT = 1000000000000000000000000; /** * @notice This is 1 in the fixed point units used in this library. * @dev Test fixed1() equals 10^digits() * Hardcoded to 24 digits. */ function fixed1() internal pure returns (Fraction memory) { return Fraction(FIXED1_UINT); } /** * @notice Wrap a uint256 that represents a 24-decimal fraction in a Fraction * struct. * @param x Number that already represents a 24-decimal fraction. * @return A Fraction struct with contents x. */ function wrap(uint256 x) internal pure returns (Fraction memory) { return Fraction(x); } /** * @notice Unwraps the uint256 inside of a Fraction struct. */ function unwrap(Fraction memory x) internal pure returns (uint256) { return x.value; } /** * @notice The amount of decimals lost on each multiplication operand. * @dev Test mulPrecision() equals sqrt(fixed1) */ function mulPrecision() internal pure returns (uint256) { return 1000000000000; } /** * @notice Maximum value that can be converted to fixed point. Optimize for deployment. * @dev * Test maxNewFixed() equals maxUint256() / fixed1() */ function maxNewFixed() internal pure returns (uint256) { return 115792089237316195423570985008687907853269984665640564; } /** * @notice Converts a uint256 to fixed point Fraction * @dev Test newFixed(0) returns 0 * Test newFixed(1) returns fixed1() * Test newFixed(maxNewFixed()) returns maxNewFixed() * fixed1() * Test newFixed(maxNewFixed()+1) fails */ function newFixed(uint256 x) internal pure returns (Fraction memory) { require(x <= maxNewFixed(), "can't create fixidity number larger than maxNewFixed()"); return Fraction(x * FIXED1_UINT); } /** * @notice Converts a uint256 in the fixed point representation of this * library to a non decimal. All decimal digits will be truncated. */ function fromFixed(Fraction memory x) internal pure returns (uint256) { return x.value / FIXED1_UINT; } /** * @notice Converts two uint256 representing a fraction to fixed point units, * equivalent to multiplying dividend and divisor by 10^digits(). * @param numerator numerator must be <= maxNewFixed() * @param denominator denominator must be <= maxNewFixed() and denominator can't be 0 * @dev * Test newFixedFraction(1,0) fails * Test newFixedFraction(0,1) returns 0 * Test newFixedFraction(1,1) returns fixed1() * Test newFixedFraction(1,fixed1()) returns 1 */ function newFixedFraction(uint256 numerator, uint256 denominator) internal pure returns (Fraction memory) { Fraction memory convertedNumerator = newFixed(numerator); Fraction memory convertedDenominator = newFixed(denominator); return divide(convertedNumerator, convertedDenominator); } /** * @notice Returns the integer part of a fixed point number. * @dev * Test integer(0) returns 0 * Test integer(fixed1()) returns fixed1() * Test integer(newFixed(maxNewFixed())) returns maxNewFixed()*fixed1() */ function integer(Fraction memory x) internal pure returns (Fraction memory) { return Fraction((x.value / FIXED1_UINT) * FIXED1_UINT); // Can't overflow } /** * @notice Returns the fractional part of a fixed point number. * In the case of a negative number the fractional is also negative. * @dev * Test fractional(0) returns 0 * Test fractional(fixed1()) returns 0 * Test fractional(fixed1()-1) returns 10^24-1 */ function fractional(Fraction memory x) internal pure returns (Fraction memory) { return Fraction(x.value - (x.value / FIXED1_UINT) * FIXED1_UINT); // Can't overflow } /** * @notice x+y. * @dev The maximum value that can be safely used as an addition operator is defined as * maxFixedAdd = maxUint256()-1 / 2, or * 57896044618658097711785492504343953926634992332820282019728792003956564819967. * Test add(maxFixedAdd,maxFixedAdd) equals maxFixedAdd + maxFixedAdd * Test add(maxFixedAdd+1,maxFixedAdd+1) throws */ function add(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) { uint256 z = x.value + y.value; require(z >= x.value, "add overflow detected"); return Fraction(z); } /** * @notice x-y. * @dev * Test subtract(6, 10) fails */ function subtract(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) { require(x.value >= y.value, "substraction underflow detected"); return Fraction(x.value - y.value); } /** * @notice x*y. If any of the operators is higher than the max multiplier value it * might overflow. * @dev The maximum value that can be safely used as a multiplication operator * (maxFixedMul) is calculated as sqrt(maxUint256()*fixed1()), * or 340282366920938463463374607431768211455999999999999 * Test multiply(0,0) returns 0 * Test multiply(maxFixedMul,0) returns 0 * Test multiply(0,maxFixedMul) returns 0 * Test multiply(fixed1()/mulPrecision(),fixed1()*mulPrecision()) returns fixed1() * Test multiply(maxFixedMul,maxFixedMul) is around maxUint256() * Test multiply(maxFixedMul+1,maxFixedMul+1) fails */ function multiply(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) { if (x.value == 0 || y.value == 0) return Fraction(0); if (y.value == FIXED1_UINT) return x; if (x.value == FIXED1_UINT) return y; // Separate into integer and fractional parts // x = x1 + x2, y = y1 + y2 uint256 x1 = integer(x).value / FIXED1_UINT; uint256 x2 = fractional(x).value; uint256 y1 = integer(y).value / FIXED1_UINT; uint256 y2 = fractional(y).value; // (x1 + x2) * (y1 + y2) = (x1 * y1) + (x1 * y2) + (x2 * y1) + (x2 * y2) uint256 x1y1 = x1 * y1; if (x1 != 0) require(x1y1 / x1 == y1, "overflow x1y1 detected"); // x1y1 needs to be multiplied back by fixed1 // solium-disable-next-line mixedcase uint256 fixed_x1y1 = x1y1 * FIXED1_UINT; if (x1y1 != 0) require(fixed_x1y1 / x1y1 == FIXED1_UINT, "overflow x1y1 * fixed1 detected"); x1y1 = fixed_x1y1; uint256 x2y1 = x2 * y1; if (x2 != 0) require(x2y1 / x2 == y1, "overflow x2y1 detected"); uint256 x1y2 = x1 * y2; if (x1 != 0) require(x1y2 / x1 == y2, "overflow x1y2 detected"); x2 = x2 / mulPrecision(); y2 = y2 / mulPrecision(); uint256 x2y2 = x2 * y2; if (x2 != 0) require(x2y2 / x2 == y2, "overflow x2y2 detected"); // result = fixed1() * x1 * y1 + x1 * y2 + x2 * y1 + x2 * y2 / fixed1(); Fraction memory result = Fraction(x1y1); result = add(result, Fraction(x2y1)); // Add checks for overflow result = add(result, Fraction(x1y2)); // Add checks for overflow result = add(result, Fraction(x2y2)); // Add checks for overflow return result; } /** * @notice 1/x * @dev * Test reciprocal(0) fails * Test reciprocal(fixed1()) returns fixed1() * Test reciprocal(fixed1()*fixed1()) returns 1 // Testing how the fractional is truncated * Test reciprocal(1+fixed1()*fixed1()) returns 0 // Testing how the fractional is truncated * Test reciprocal(newFixedFraction(1, 1e24)) returns newFixed(1e24) */ function reciprocal(Fraction memory x) internal pure returns (Fraction memory) { require(x.value != 0, "can't call reciprocal(0)"); return Fraction((FIXED1_UINT * FIXED1_UINT) / x.value); // Can't overflow } /** * @notice x/y. If the dividend is higher than the max dividend value, it * might overflow. You can use multiply(x,reciprocal(y)) instead. * @dev The maximum value that can be safely used as a dividend (maxNewFixed) is defined as * divide(maxNewFixed,newFixedFraction(1,fixed1())) is around maxUint256(). * This yields the value 115792089237316195423570985008687907853269984665640564. * Test maxNewFixed equals maxUint256()/fixed1() * Test divide(maxNewFixed,1) equals maxNewFixed*(fixed1) * Test divide(maxNewFixed+1,multiply(mulPrecision(),mulPrecision())) throws * Test divide(fixed1(),0) fails * Test divide(maxNewFixed,1) = maxNewFixed*(10^digits()) * Test divide(maxNewFixed+1,1) throws */ function divide(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) { require(y.value != 0, "can't divide by 0"); uint256 X = x.value * FIXED1_UINT; require(X / FIXED1_UINT == x.value, "overflow at divide"); return Fraction(X / y.value); } /** * @notice x > y */ function gt(Fraction memory x, Fraction memory y) internal pure returns (bool) { return x.value > y.value; } /** * @notice x >= y */ function gte(Fraction memory x, Fraction memory y) internal pure returns (bool) { return x.value >= y.value; } /** * @notice x < y */ function lt(Fraction memory x, Fraction memory y) internal pure returns (bool) { return x.value < y.value; } /** * @notice x <= y */ function lte(Fraction memory x, Fraction memory y) internal pure returns (bool) { return x.value <= y.value; } /** * @notice x == y */ function equals(Fraction memory x, Fraction memory y) internal pure returns (bool) { return x.value == y.value; } /** * @notice x <= 1 */ function isProperFraction(Fraction memory x) internal pure returns (bool) { return lte(x, fixed1()); } }
Initializable.sol
pragma solidity ^0.5.13; contract Initializable { bool public initialized; constructor(bool testingDeployment) public { if (!testingDeployment) { initialized = true; } } modifier initializer() { require(!initialized, "contract already initialized"); initialized = true; _; } }
UsingRegistry.sol
pragma solidity ^0.5.13; import "openzeppelin-solidity/contracts/ownership/Ownable.sol"; import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol"; import "./interfaces/IAccounts.sol"; import "./interfaces/IFeeCurrencyWhitelist.sol"; import "./interfaces/IFreezer.sol"; import "./interfaces/IRegistry.sol"; import "../governance/interfaces/IElection.sol"; import "../governance/interfaces/IGovernance.sol"; import "../governance/interfaces/ILockedGold.sol"; import "../governance/interfaces/IValidators.sol"; import "../identity/interfaces/IRandom.sol"; import "../identity/interfaces/IAttestations.sol"; import "../stability/interfaces/IExchange.sol"; import "../stability/interfaces/IReserve.sol"; import "../stability/interfaces/ISortedOracles.sol"; import "../stability/interfaces/IStableToken.sol"; contract UsingRegistry is Ownable { event RegistrySet(address indexed registryAddress); // solhint-disable state-visibility bytes32 constant ACCOUNTS_REGISTRY_ID = keccak256(abi.encodePacked("Accounts")); bytes32 constant ATTESTATIONS_REGISTRY_ID = keccak256(abi.encodePacked("Attestations")); bytes32 constant DOWNTIME_SLASHER_REGISTRY_ID = keccak256(abi.encodePacked("DowntimeSlasher")); bytes32 constant DOUBLE_SIGNING_SLASHER_REGISTRY_ID = keccak256( abi.encodePacked("DoubleSigningSlasher") ); bytes32 constant ELECTION_REGISTRY_ID = keccak256(abi.encodePacked("Election")); bytes32 constant EXCHANGE_REGISTRY_ID = keccak256(abi.encodePacked("Exchange")); bytes32 constant FEE_CURRENCY_WHITELIST_REGISTRY_ID = keccak256( abi.encodePacked("FeeCurrencyWhitelist") ); bytes32 constant FREEZER_REGISTRY_ID = keccak256(abi.encodePacked("Freezer")); bytes32 constant GOLD_TOKEN_REGISTRY_ID = keccak256(abi.encodePacked("GoldToken")); bytes32 constant GOVERNANCE_REGISTRY_ID = keccak256(abi.encodePacked("Governance")); bytes32 constant GOVERNANCE_SLASHER_REGISTRY_ID = keccak256( abi.encodePacked("GovernanceSlasher") ); bytes32 constant LOCKED_GOLD_REGISTRY_ID = keccak256(abi.encodePacked("LockedGold")); bytes32 constant RESERVE_REGISTRY_ID = keccak256(abi.encodePacked("Reserve")); bytes32 constant RANDOM_REGISTRY_ID = keccak256(abi.encodePacked("Random")); bytes32 constant SORTED_ORACLES_REGISTRY_ID = keccak256(abi.encodePacked("SortedOracles")); bytes32 constant STABLE_TOKEN_REGISTRY_ID = keccak256(abi.encodePacked("StableToken")); bytes32 constant VALIDATORS_REGISTRY_ID = keccak256(abi.encodePacked("Validators")); // solhint-enable state-visibility IRegistry public registry; modifier onlyRegisteredContract(bytes32 identifierHash) { require(registry.getAddressForOrDie(identifierHash) == msg.sender, "only registered contract"); _; } modifier onlyRegisteredContracts(bytes32[] memory identifierHashes) { require(registry.isOneOf(identifierHashes, msg.sender), "only registered contracts"); _; } /** * @notice Updates the address pointing to a Registry contract. * @param registryAddress The address of a registry contract for routing to other contracts. */ function setRegistry(address registryAddress) public onlyOwner { require(registryAddress != address(0), "Cannot register the null address"); registry = IRegistry(registryAddress); emit RegistrySet(registryAddress); } function getAccounts() internal view returns (IAccounts) { return IAccounts(registry.getAddressForOrDie(ACCOUNTS_REGISTRY_ID)); } function getAttestations() internal view returns (IAttestations) { return IAttestations(registry.getAddressForOrDie(ATTESTATIONS_REGISTRY_ID)); } function getElection() internal view returns (IElection) { return IElection(registry.getAddressForOrDie(ELECTION_REGISTRY_ID)); } function getExchange() internal view returns (IExchange) { return IExchange(registry.getAddressForOrDie(EXCHANGE_REGISTRY_ID)); } function getFeeCurrencyWhitelistRegistry() internal view returns (IFeeCurrencyWhitelist) { return IFeeCurrencyWhitelist(registry.getAddressForOrDie(FEE_CURRENCY_WHITELIST_REGISTRY_ID)); } function getFreezer() internal view returns (IFreezer) { return IFreezer(registry.getAddressForOrDie(FREEZER_REGISTRY_ID)); } function getGoldToken() internal view returns (IERC20) { return IERC20(registry.getAddressForOrDie(GOLD_TOKEN_REGISTRY_ID)); } function getGovernance() internal view returns (IGovernance) { return IGovernance(registry.getAddressForOrDie(GOVERNANCE_REGISTRY_ID)); } function getLockedGold() internal view returns (ILockedGold) { return ILockedGold(registry.getAddressForOrDie(LOCKED_GOLD_REGISTRY_ID)); } function getRandom() internal view returns (IRandom) { return IRandom(registry.getAddressForOrDie(RANDOM_REGISTRY_ID)); } function getReserve() internal view returns (IReserve) { return IReserve(registry.getAddressForOrDie(RESERVE_REGISTRY_ID)); } function getSortedOracles() internal view returns (ISortedOracles) { return ISortedOracles(registry.getAddressForOrDie(SORTED_ORACLES_REGISTRY_ID)); } function getStableToken() internal view returns (IStableToken) { return IStableToken(registry.getAddressForOrDie(STABLE_TOKEN_REGISTRY_ID)); } function getValidators() internal view returns (IValidators) { return IValidators(registry.getAddressForOrDie(VALIDATORS_REGISTRY_ID)); } }
IAccounts.sol
pragma solidity ^0.5.13; interface IAccounts { function isAccount(address) external view returns (bool); function voteSignerToAccount(address) external view returns (address); function validatorSignerToAccount(address) external view returns (address); function attestationSignerToAccount(address) external view returns (address); function signerToAccount(address) external view returns (address); function getAttestationSigner(address) external view returns (address); function getValidatorSigner(address) external view returns (address); function getVoteSigner(address) external view returns (address); function hasAuthorizedVoteSigner(address) external view returns (bool); function hasAuthorizedValidatorSigner(address) external view returns (bool); function hasAuthorizedAttestationSigner(address) external view returns (bool); function setAccountDataEncryptionKey(bytes calldata) external; function setMetadataURL(string calldata) external; function setName(string calldata) external; function setWalletAddress(address, uint8, bytes32, bytes32) external; function setAccount(string calldata, bytes calldata, address, uint8, bytes32, bytes32) external; function getDataEncryptionKey(address) external view returns (bytes memory); function getWalletAddress(address) external view returns (address); function getMetadataURL(address) external view returns (string memory); function batchGetMetadataURL(address[] calldata) external view returns (uint256[] memory, bytes memory); function getName(address) external view returns (string memory); function authorizeVoteSigner(address, uint8, bytes32, bytes32) external; function authorizeValidatorSigner(address, uint8, bytes32, bytes32) external; function authorizeValidatorSignerWithPublicKey(address, uint8, bytes32, bytes32, bytes calldata) external; function authorizeValidatorSignerWithKeys( address, uint8, bytes32, bytes32, bytes calldata, bytes calldata, bytes calldata ) external; function authorizeAttestationSigner(address, uint8, bytes32, bytes32) external; function createAccount() external returns (bool); }
ICeloVersionedContract.sol
pragma solidity ^0.5.13; interface ICeloVersionedContract { /** * @notice Returns the storage, major, minor, and patch version of the contract. * @return The storage, major, minor, and patch version of the contract. */ function getVersionNumber() external pure returns (uint256, uint256, uint256, uint256); }
IFeeCurrencyWhitelist.sol
pragma solidity ^0.5.13; interface IFeeCurrencyWhitelist { function addToken(address) external; function getWhitelist() external view returns (address[] memory); }
IFreezer.sol
pragma solidity ^0.5.13; interface IFreezer { function isFrozen(address) external view returns (bool); }
IRegistry.sol
pragma solidity ^0.5.13; interface IRegistry { function setAddressFor(string calldata, address) external; function getAddressForOrDie(bytes32) external view returns (address); function getAddressFor(bytes32) external view returns (address); function getAddressForStringOrDie(string calldata identifier) external view returns (address); function getAddressForString(string calldata identifier) external view returns (address); function isOneOf(bytes32[] calldata, address) external view returns (bool); }
ReentrancyGuard.sol
pragma solidity ^0.5.13; /** * @title Helps contracts guard against reentrancy attacks. * @author Remco Bloemen <remco@2π.com>, Eenae <alexey@mixbytes.io> * @dev If you mark a function `nonReentrant`, you should also * mark it `external`. */ contract ReentrancyGuard { /// @dev counter to allow mutex lock with only one SSTORE operation uint256 private _guardCounter; constructor() internal { // The counter starts at one to prevent changing it from zero to a non-zero // value, which is a more expensive operation. _guardCounter = 1; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and make it call a * `private` function that does the actual work. */ modifier nonReentrant() { _guardCounter += 1; uint256 localCounter = _guardCounter; _; require(localCounter == _guardCounter, "reentrant call"); } }
IElection.sol
pragma solidity ^0.5.13; interface IElection { function electValidatorSigners() external view returns (address[] memory); function electNValidatorSigners(uint256, uint256) external view returns (address[] memory); function vote(address, uint256, address, address) external returns (bool); function activate(address) external returns (bool); function revokeActive(address, uint256, address, address, uint256) external returns (bool); function revokeAllActive(address, address, address, uint256) external returns (bool); function revokePending(address, uint256, address, address, uint256) external returns (bool); function markGroupIneligible(address) external; function markGroupEligible(address, address, address) external; function forceDecrementVotes( address, uint256, address[] calldata, address[] calldata, uint256[] calldata ) external returns (uint256); // view functions function getElectableValidators() external view returns (uint256, uint256); function getElectabilityThreshold() external view returns (uint256); function getNumVotesReceivable(address) external view returns (uint256); function getTotalVotes() external view returns (uint256); function getActiveVotes() external view returns (uint256); function getTotalVotesByAccount(address) external view returns (uint256); function getPendingVotesForGroupByAccount(address, address) external view returns (uint256); function getActiveVotesForGroupByAccount(address, address) external view returns (uint256); function getTotalVotesForGroupByAccount(address, address) external view returns (uint256); function getActiveVoteUnitsForGroupByAccount(address, address) external view returns (uint256); function getTotalVotesForGroup(address) external view returns (uint256); function getActiveVotesForGroup(address) external view returns (uint256); function getPendingVotesForGroup(address) external view returns (uint256); function getGroupEligibility(address) external view returns (bool); function getGroupEpochRewards(address, uint256, uint256[] calldata) external view returns (uint256); function getGroupsVotedForByAccount(address) external view returns (address[] memory); function getEligibleValidatorGroups() external view returns (address[] memory); function getTotalVotesForEligibleValidatorGroups() external view returns (address[] memory, uint256[] memory); function getCurrentValidatorSigners() external view returns (address[] memory); function canReceiveVotes(address, uint256) external view returns (bool); function hasActivatablePendingVotes(address, address) external view returns (bool); // only owner function setElectableValidators(uint256, uint256) external returns (bool); function setMaxNumGroupsVotedFor(uint256) external returns (bool); function setElectabilityThreshold(uint256) external returns (bool); // only VM function distributeEpochRewards(address, uint256, address, address) external; }
IGovernance.sol
pragma solidity ^0.5.13; interface IGovernance { function isVoting(address) external view returns (bool); }
ILockedGold.sol
pragma solidity ^0.5.13; interface ILockedGold { function incrementNonvotingAccountBalance(address, uint256) external; function decrementNonvotingAccountBalance(address, uint256) external; function getAccountTotalLockedGold(address) external view returns (uint256); function getTotalLockedGold() external view returns (uint256); function getPendingWithdrawals(address) external view returns (uint256[] memory, uint256[] memory); function getTotalPendingWithdrawals(address) external view returns (uint256); function lock() external payable; function unlock(uint256) external; function relock(uint256, uint256) external; function withdraw(uint256) external; function slash( address account, uint256 penalty, address reporter, uint256 reward, address[] calldata lessers, address[] calldata greaters, uint256[] calldata indices ) external; function isSlasher(address) external view returns (bool); }
IValidators.sol
pragma solidity ^0.5.13; interface IValidators { function registerValidator(bytes calldata, bytes calldata, bytes calldata) external returns (bool); function deregisterValidator(uint256) external returns (bool); function affiliate(address) external returns (bool); function deaffiliate() external returns (bool); function updateBlsPublicKey(bytes calldata, bytes calldata) external returns (bool); function registerValidatorGroup(uint256) external returns (bool); function deregisterValidatorGroup(uint256) external returns (bool); function addMember(address) external returns (bool); function addFirstMember(address, address, address) external returns (bool); function removeMember(address) external returns (bool); function reorderMember(address, address, address) external returns (bool); function updateCommission() external; function setNextCommissionUpdate(uint256) external; function resetSlashingMultiplier() external; // only owner function setCommissionUpdateDelay(uint256) external; function setMaxGroupSize(uint256) external returns (bool); function setMembershipHistoryLength(uint256) external returns (bool); function setValidatorScoreParameters(uint256, uint256) external returns (bool); function setGroupLockedGoldRequirements(uint256, uint256) external returns (bool); function setValidatorLockedGoldRequirements(uint256, uint256) external returns (bool); function setSlashingMultiplierResetPeriod(uint256) external; // view functions function getMaxGroupSize() external view returns (uint256); function getCommissionUpdateDelay() external view returns (uint256); function getValidatorScoreParameters() external view returns (uint256, uint256); function getMembershipHistory(address) external view returns (uint256[] memory, address[] memory, uint256, uint256); function calculateEpochScore(uint256) external view returns (uint256); function calculateGroupEpochScore(uint256[] calldata) external view returns (uint256); function getAccountLockedGoldRequirement(address) external view returns (uint256); function meetsAccountLockedGoldRequirements(address) external view returns (bool); function getValidatorBlsPublicKeyFromSigner(address) external view returns (bytes memory); function getValidator(address account) external view returns (bytes memory, bytes memory, address, uint256, address); function getValidatorGroup(address) external view returns (address[] memory, uint256, uint256, uint256, uint256[] memory, uint256, uint256); function getGroupNumMembers(address) external view returns (uint256); function getTopGroupValidators(address, uint256) external view returns (address[] memory); function getGroupsNumMembers(address[] calldata accounts) external view returns (uint256[] memory); function getNumRegisteredValidators() external view returns (uint256); function groupMembershipInEpoch(address, uint256, uint256) external view returns (address); // only registered contract function updateEcdsaPublicKey(address, address, bytes calldata) external returns (bool); function updatePublicKeys(address, address, bytes calldata, bytes calldata, bytes calldata) external returns (bool); function getValidatorLockedGoldRequirements() external view returns (uint256, uint256); function getGroupLockedGoldRequirements() external view returns (uint256, uint256); function getRegisteredValidators() external view returns (address[] memory); function getRegisteredValidatorSigners() external view returns (address[] memory); function getRegisteredValidatorGroups() external view returns (address[] memory); function isValidatorGroup(address) external view returns (bool); function isValidator(address) external view returns (bool); function getValidatorGroupSlashingMultiplier(address) external view returns (uint256); function getMembershipInLastEpoch(address) external view returns (address); function getMembershipInLastEpochFromSigner(address) external view returns (address); // only VM function updateValidatorScoreFromSigner(address, uint256) external; function distributeEpochPaymentsFromSigner(address, uint256) external returns (uint256); // only slasher function forceDeaffiliateIfValidator(address) external; function halveSlashingMultiplier(address) external; }
IAttestations.sol
pragma solidity ^0.5.13; interface IAttestations { function request(bytes32, uint256, address) external; function selectIssuers(bytes32) external; function complete(bytes32, uint8, bytes32, bytes32) external; function revoke(bytes32, uint256) external; function withdraw(address) external; function approveTransfer(bytes32, uint256, address, address, bool) external; // view functions function getUnselectedRequest(bytes32, address) external view returns (uint32, uint32, address); function getAttestationIssuers(bytes32, address) external view returns (address[] memory); function getAttestationStats(bytes32, address) external view returns (uint32, uint32); function batchGetAttestationStats(bytes32[] calldata) external view returns (uint256[] memory, address[] memory, uint64[] memory, uint64[] memory); function getAttestationState(bytes32, address, address) external view returns (uint8, uint32, address); function getCompletableAttestations(bytes32, address) external view returns (uint32[] memory, address[] memory, uint256[] memory, bytes memory); function getAttestationRequestFee(address) external view returns (uint256); function getMaxAttestations() external view returns (uint256); function validateAttestationCode(bytes32, address, uint8, bytes32, bytes32) external view returns (address); function lookupAccountsForIdentifier(bytes32) external view returns (address[] memory); function requireNAttestationsRequested(bytes32, address, uint32) external view; // only owner function setAttestationRequestFee(address, uint256) external; function setAttestationExpiryBlocks(uint256) external; function setSelectIssuersWaitBlocks(uint256) external; function setMaxAttestations(uint256) external; }
IRandom.sol
pragma solidity ^0.5.13; interface IRandom { function revealAndCommit(bytes32, bytes32, address) external; function randomnessBlockRetentionWindow() external view returns (uint256); function random() external view returns (bytes32); function getBlockRandomness(uint256) external view returns (bytes32); }
IExchange.sol
pragma solidity ^0.5.13; interface IExchange { function buy(uint256, uint256, bool) external returns (uint256); function sell(uint256, uint256, bool) external returns (uint256); function exchange(uint256, uint256, bool) external returns (uint256); function setUpdateFrequency(uint256) external; function getBuyTokenAmount(uint256, bool) external view returns (uint256); function getSellTokenAmount(uint256, bool) external view returns (uint256); function getBuyAndSellBuckets(bool) external view returns (uint256, uint256); }
IReserve.sol
pragma solidity ^0.5.13; interface IReserve { function setTobinTaxStalenessThreshold(uint256) external; function addToken(address) external returns (bool); function removeToken(address, uint256) external returns (bool); function transferGold(address payable, uint256) external returns (bool); function transferExchangeGold(address payable, uint256) external returns (bool); function getReserveGoldBalance() external view returns (uint256); function getUnfrozenReserveGoldBalance() external view returns (uint256); function getOrComputeTobinTax() external returns (uint256, uint256); function getTokens() external view returns (address[] memory); function getReserveRatio() external view returns (uint256); function addExchangeSpender(address) external; function removeExchangeSpender(address, uint256) external; function addSpender(address) external; function removeSpender(address) external; }
ISortedOracles.sol
pragma solidity ^0.5.13; interface ISortedOracles { function addOracle(address, address) external; function removeOracle(address, address, uint256) external; function report(address, uint256, address, address) external; function removeExpiredReports(address, uint256) external; function isOldestReportExpired(address token) external view returns (bool, address); function numRates(address) external view returns (uint256); function medianRate(address) external view returns (uint256, uint256); function numTimestamps(address) external view returns (uint256); function medianTimestamp(address) external view returns (uint256); }
IStableToken.sol
pragma solidity ^0.5.13; /** * @title This interface describes the functions specific to Celo Stable Tokens, and in the * absence of interface inheritance is intended as a companion to IERC20.sol and ICeloToken.sol. */ interface IStableToken { function mint(address, uint256) external returns (bool); function burn(uint256) external returns (bool); function setInflationParameters(uint256, uint256) external; function valueToUnits(uint256) external view returns (uint256); function unitsToValue(uint256) external view returns (uint256); function getInflationParameters() external view returns (uint256, uint256, uint256, uint256); // NOTE: duplicated with IERC20.sol, remove once interface inheritance is supported. function balanceOf(address) external view returns (uint256); }
Context.sol
pragma solidity ^0.5.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ contract Context { // Empty internal constructor, to prevent people from mistakenly deploying // an instance of this contract, which should be used via inheritance. constructor () internal { } // solhint-disable-previous-line no-empty-blocks function _msgSender() internal view returns (address payable) { return msg.sender; } function _msgData() internal view returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
SafeMath.sol
pragma solidity ^0.5.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. * * _Available since v2.4.0._ */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. * * _Available since v2.4.0._ */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. * * _Available since v2.4.0._ */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
Ownable.sol
pragma solidity ^0.5.0; import "../GSN/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor () internal { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(isOwner(), "Ownable: caller is not the owner"); _; } /** * @dev Returns true if the caller is the current owner. */ function isOwner() public view returns (bool) { return _msgSender() == _owner; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public onlyOwner { emit OwnershipTransferred(_owner, address(0)); _owner = address(0); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public onlyOwner { _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). */ function _transferOwnership(address newOwner) internal { require(newOwner != address(0), "Ownable: new owner is the zero address"); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } }
IERC20.sol
pragma solidity ^0.5.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. Does not include * the optional functions; to access them see {ERC20Detailed}. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
Contract ABI
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payable"},{"type":"address","name":"stableToken","internalType":"address"},{"type":"uint8","name":"state","internalType":"enum GrandaMento.ExchangeProposalState"},{"type":"bool","name":"sellCelo","internalType":"bool"},{"type":"uint256","name":"sellAmount","internalType":"uint256"},{"type":"uint256","name":"buyAmount","internalType":"uint256"},{"type":"uint256","name":"celoStableTokenExchangeRate","internalType":"uint256"},{"type":"uint256","name":"vetoPeriodSeconds","internalType":"uint256"},{"type":"uint256","name":"approvalTimestamp","internalType":"uint256"}],"name":"exchangeProposals","inputs":[{"type":"uint256","name":"","internalType":"uint256"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"executeExchangeProposal","inputs":[{"type":"uint256","name":"proposalId","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256[]","name":"","internalType":"uint256[]"}],"name":"getActiveProposalIds","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getBuyAmount","inputs":[{"type":"uint256","name":"celoStableTokenExchangeRate","internalType":"uint256"},{"type":"uint256","name":"sellAmount","internalType":"uint256"},{"type":"bool","name":"sellCelo","internalType":"bool"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"}],"name":"getStableTokenExchangeLimits","inputs":[{"type":"string","name":"stableTokenRegistryId","internalType":"string"}],"constant":true},{"type":"function","stateMutability":"pure","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"}],"name":"getVersionNumber","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"initialize","inputs":[{"type":"address","name":"_registry","internalType":"address"},{"type":"address","name":"_approver","internalType":"address"},{"type":"uint256","name":"_maxApprovalExchangeRateChange","internalType":"uint256"},{"type":"uint256","name":"_spread","internalType":"uint256"},{"type":"uint256","name":"_vetoPeriodSeconds","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"initialized","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isOwner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"value","internalType":"uint256"}],"name":"maxApprovalExchangeRateChange","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"contract IRegistry"}],"name":"registry","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"removeFromActiveProposalIdsSuperset","inputs":[{"type":"uint256","name":"index","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"renounceOwnership","inputs":[],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setApprover","inputs":[{"type":"address","name":"newApprover","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setMaxApprovalExchangeRateChange","inputs":[{"type":"uint256","name":"newMaxApprovalExchangeRateChange","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setRegistry","inputs":[{"type":"address","name":"registryAddress","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setSpread","inputs":[{"type":"uint256","name":"newSpread","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setStableTokenExchangeLimits","inputs":[{"type":"string","name":"stableTokenRegistryId","internalType":"string"},{"type":"uint256","name":"minExchangeAmount","internalType":"uint256"},{"type":"uint256","name":"maxExchangeAmount","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setVetoPeriodSeconds","inputs":[{"type":"uint256","name":"newVetoPeriodSeconds","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"value","internalType":"uint256"}],"name":"spread","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"minExchangeAmount","internalType":"uint256"},{"type":"uint256","name":"maxExchangeAmount","internalType":"uint256"}],"name":"stableTokenExchangeLimits","inputs":[{"type":"string","name":"","internalType":"string"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"vetoPeriodSeconds","inputs":[],"constant":true}]
Contract Creation Code
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