ERC-20
Overview
Max Total Supply
29.843650154979289678 A-WETH-LP
Holders
723
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
0.009975166781847971 A-WETH-LPValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
BridgePoolProd
Compiler Version
v0.8.9+commit.e5eed63a
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; import "./interfaces/BridgeAdminInterface.sol"; import "./interfaces/BridgePoolInterface.sol"; import "../oracle/interfaces/SkinnyOptimisticOracleInterface.sol"; import "../oracle/interfaces/StoreInterface.sol"; import "../oracle/interfaces/FinderInterface.sol"; import "../oracle/implementation/Constants.sol"; import "../common/implementation/AncillaryData.sol"; import "../common/implementation/Testable.sol"; import "../common/implementation/FixedPoint.sol"; import "../common/implementation/Lockable.sol"; import "../common/implementation/MultiCaller.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts/utils/Address.sol"; interface WETH9Like { function withdraw(uint256 wad) external; function deposit() external payable; } /** * @notice Contract deployed on L1 that provides methods for "Relayers" to fulfill deposit orders that originated on L2. * The Relayers can either post capital to fulfill the deposit (instant relay), or request that the funds are taken out * of a passive liquidity provider pool following a challenge period (slow relay). This contract ingests liquidity from * passive liquidity providers and returns them claims to withdraw their funds. Liquidity providers are incentivized * to post collateral by earning a fee per fulfilled deposit order. * @dev A "Deposit" is an order to send capital from L2 to L1, and a "Relay" is a fulfillment attempt of that order. */ contract BridgePool is MultiCaller, Testable, BridgePoolInterface, ERC20, Lockable { using SafeERC20 for IERC20; using FixedPoint for FixedPoint.Unsigned; using Address for address; // Token that this contract receives as LP deposits. IERC20 public override l1Token; // Track the total number of relays and uniquely identifies relays. uint32 public numberOfRelays; // Reserves that are unutilized and withdrawable. uint256 public liquidReserves; // Reserves currently utilized due to L2-L1 transactions in flight. int256 public utilizedReserves; // Reserves that are not yet utilized but are pre-allocated for a pending relay. uint256 public pendingReserves; // True If this pool houses WETH. If the withdrawn token is WETH then unwrap and send ETH when finalizing // withdrawal. bool public isWethPool; // Exponential decay exchange rate to accumulate fees to LPs over time. uint64 public lpFeeRatePerSecond; // Last timestamp that LP fees were updated. uint32 public lastLpFeeUpdate; // Store local instances of contract params to save gas relaying. uint64 public proposerBondPct; uint32 public optimisticOracleLiveness; // Store local instance of the reserve currency final fee. This is a gas optimization to not re-call the store. uint256 l1TokenFinalFee; // Cumulative undistributed LP fees. As fees accumulate, they are subtracted from this number. uint256 public undistributedLpFees; // Total bond amount held for pending relays. Bonds are released following a successful relay or after a dispute. uint256 public bonds; // Administrative contract that deployed this contract and also houses all state variables needed to relay deposits. BridgeAdminInterface public bridgeAdmin; // Store local instances of the contract instances to save gas relaying. Can be sync with the Finder at any time via // the syncUmaEcosystemParams() public function. StoreInterface public store; SkinnyOptimisticOracleInterface public optimisticOracle; // DVM price request identifier that is resolved based on the validity of a relay attempt. bytes32 public identifier; // A Relay represents an attempt to finalize a cross-chain transfer that originated on an L2 DepositBox contract. // The flow chart between states is as follows: // - Begin at Uninitialized. // - When relayDeposit() is called, a new relay is created with state Pending and mapped to the L2 deposit hash. // - If the relay is disputed, the RelayData gets deleted and the L2 deposit hash has no relay mapped to it anymore. // - The above statements enable state to transfer between the Uninitialized and Pending states. // - When settleRelay() is successfully called, the relay state gets set to Finalized and cannot change from there. // - It is impossible for a relay to be deleted when in Finalized state (and have its state set to Uninitialized) // because the only way for settleRelay() to succeed is if the price has resolved on the OptimisticOracle. // - You cannot dispute an already resolved request on the OptimisticOracle. Moreover, the mapping from // a relay's ancillary data hash to its deposit hash is deleted after a successful settleRelay() call. enum RelayState { Uninitialized, Pending, Finalized } // Data from L2 deposit transaction. struct DepositData { uint256 chainId; uint64 depositId; address payable l1Recipient; address l2Sender; uint256 amount; uint64 slowRelayFeePct; uint64 instantRelayFeePct; uint32 quoteTimestamp; } // Each L2 Deposit can have one Relay attempt at any one time. A Relay attempt is characterized by its RelayData. struct RelayData { RelayState relayState; address slowRelayer; uint32 relayId; uint64 realizedLpFeePct; uint32 priceRequestTime; uint256 proposerBond; uint256 finalFee; } // Associate deposits with pending relay data. When the mapped relay hash is empty, new relay attempts can be made // for this deposit. The relay data contains information necessary to pay out relayers on successful relay. // Relay hashes are deleted when they are disputed on the OptimisticOracle. mapping(bytes32 => bytes32) public relays; // Map hash of deposit and realized-relay fee to instant relayers. This mapping is checked at settlement time // to determine if there was a valid instant relayer. mapping(bytes32 => address) public instantRelays; event LiquidityAdded(uint256 amount, uint256 lpTokensMinted, address indexed liquidityProvider); event LiquidityRemoved(uint256 amount, uint256 lpTokensBurnt, address indexed liquidityProvider); event DepositRelayed( bytes32 indexed depositHash, DepositData depositData, RelayData relay, bytes32 relayAncillaryDataHash ); event RelaySpedUp(bytes32 indexed depositHash, address indexed instantRelayer, RelayData relay); // Note: the difference between a dispute and a cancellation is that a cancellation happens in the case where // something changes in the OO between request and dispute that causes calls to it to fail. The most common // case would be an increase in final fee. However, things like whitelisting can also cause problems. event RelayDisputed(bytes32 indexed depositHash, bytes32 indexed relayHash, address indexed disputer); event RelayCanceled(bytes32 indexed depositHash, bytes32 indexed relayHash, address indexed disputer); event RelaySettled(bytes32 indexed depositHash, address indexed caller, RelayData relay); event BridgePoolAdminTransferred(address oldAdmin, address newAdmin); /** * @notice Construct the Bridge Pool. * @param _lpTokenName Name of the LP token to be deployed by this contract. * @param _lpTokenSymbol Symbol of the LP token to be deployed by this contract. * @param _bridgeAdmin Admin contract deployed alongside on L1. Stores global variables and has owner control. * @param _l1Token Address of the L1 token that this bridgePool holds. This is the token LPs deposit and is bridged. * @param _lpFeeRatePerSecond Interest rate payment that scales the amount of pending fees per second paid to LPs. * @param _isWethPool Toggles if this is the WETH pool. If it is then can accept ETH and wrap to WETH for the user. * @param _timer Timer used to synchronize contract time in testing. Set to 0x000... in production. */ constructor( string memory _lpTokenName, string memory _lpTokenSymbol, address _bridgeAdmin, address _l1Token, uint64 _lpFeeRatePerSecond, bool _isWethPool, address _timer ) Testable(_timer) ERC20(_lpTokenName, _lpTokenSymbol) { require(bytes(_lpTokenName).length != 0 && bytes(_lpTokenSymbol).length != 0, "Bad LP token name or symbol"); bridgeAdmin = BridgeAdminInterface(_bridgeAdmin); l1Token = IERC20(_l1Token); lastLpFeeUpdate = uint32(getCurrentTime()); lpFeeRatePerSecond = _lpFeeRatePerSecond; isWethPool = _isWethPool; syncUmaEcosystemParams(); // Fetch OptimisticOracle and Store addresses and L1Token finalFee. syncWithBridgeAdminParams(); // Fetch ProposerBondPct OptimisticOracleLiveness, Identifier from the BridgeAdmin. } /************************************************* * LIQUIDITY PROVIDER FUNCTIONS * *************************************************/ /** * @notice Add liquidity to the bridge pool. Pulls l1Token from the caller's wallet. The caller is sent back a * commensurate number of LP tokens (minted to their address) at the prevailing exchange rate. * @dev The caller must approve this contract to transfer `l1TokenAmount` amount of l1Token if depositing ERC20. * @dev The caller can deposit ETH which is auto wrapped to WETH. This can only be done if: a) this is the Weth pool * and b) the l1TokenAmount matches to the transaction msg.value. * @dev Reentrancy guard not added to this function because this indirectly calls sync() which is guarded. * @param l1TokenAmount Number of l1Token to add as liquidity. */ function addLiquidity(uint256 l1TokenAmount) public payable nonReentrant() { // If this is the weth pool and the caller sends msg.value then the msg.value must match the l1TokenAmount. // Else, msg.value must be set to 0. require((isWethPool && msg.value == l1TokenAmount) || msg.value == 0, "Bad add liquidity Eth value"); // Since `exchangeRateCurrent()` reads this contract's balance and updates contract state using it, // we must call it first before transferring any tokens to this contract. uint256 lpTokensToMint = (l1TokenAmount * 1e18) / _exchangeRateCurrent(); _mint(msg.sender, lpTokensToMint); liquidReserves += l1TokenAmount; if (msg.value > 0 && isWethPool) WETH9Like(address(l1Token)).deposit{ value: msg.value }(); else l1Token.safeTransferFrom(msg.sender, address(this), l1TokenAmount); emit LiquidityAdded(l1TokenAmount, lpTokensToMint, msg.sender); } /** * @notice Removes liquidity from the bridge pool. Burns lpTokenAmount LP tokens from the caller's wallet. The caller * is sent back a commensurate number of l1Tokens at the prevailing exchange rate. * @dev The caller does not need to approve the spending of LP tokens as this method directly uses the burn logic. * @dev Reentrancy guard not added to this function because this indirectly calls sync() which is guarded. * @param lpTokenAmount Number of lpTokens to redeem for underlying. * @param sendEth Enable the liquidity provider to remove liquidity in ETH, if this is the WETH pool. */ function removeLiquidity(uint256 lpTokenAmount, bool sendEth) public nonReentrant() { // Can only send eth on withdrawing liquidity iff this is the WETH pool. require(!sendEth || isWethPool, "Cant send eth"); uint256 l1TokensToReturn = (lpTokenAmount * _exchangeRateCurrent()) / 1e18; // Check that there is enough liquid reserves to withdraw the requested amount. require(liquidReserves >= (pendingReserves + l1TokensToReturn), "Utilization too high to remove"); _burn(msg.sender, lpTokenAmount); liquidReserves -= l1TokensToReturn; if (sendEth) _unwrapWETHTo(payable(msg.sender), l1TokensToReturn); else l1Token.safeTransfer(msg.sender, l1TokensToReturn); emit LiquidityRemoved(l1TokensToReturn, lpTokenAmount, msg.sender); } /************************************** * RELAYER FUNCTIONS * **************************************/ /** * @notice Called by Relayer to execute a slow + fast relay from L2 to L1, fulfilling a corresponding deposit order. * @dev There can only be one pending relay for a deposit. This method is effectively the relayDeposit and * speedUpRelay methods concatenated. This could be refactored to just call each method, but there * are some gas savings in combining the transfers and hash computations. * @dev Caller must have approved this contract to spend the total bond + amount - fees for `l1Token`. * @param depositData the deposit data struct containing all the user's deposit information. * @param realizedLpFeePct LP fee calculated off-chain considering the L1 pool liquidity at deposit time, before * quoteTimestamp. The OO acts to verify the correctness of this realized fee. Cannot exceed 50%. */ function relayAndSpeedUp(DepositData memory depositData, uint64 realizedLpFeePct) public nonReentrant() { // If no pending relay for this deposit, then associate the caller's relay attempt with it. uint32 priceRequestTime = uint32(getCurrentTime()); // The realizedLPFeePct should never be greater than 0.5e18 and the slow and instant relay fees should never be // more than 0.25e18 each. Therefore, the sum of all fee types can never exceed 1e18 (or 100%). require( depositData.slowRelayFeePct <= 0.25e18 && depositData.instantRelayFeePct <= 0.25e18 && realizedLpFeePct <= 0.5e18, "Invalid fees" ); // Check if there is a pending relay for this deposit. bytes32 depositHash = _getDepositHash(depositData); // Note: A disputed relay deletes the stored relay hash and enables this require statement to pass. require(relays[depositHash] == bytes32(0), "Pending relay exists"); uint256 proposerBond = _getProposerBond(depositData.amount); // Save hash of new relay attempt parameters. // Note: The liveness for this relay can be changed in the BridgeAdmin, which means that each relay has a // potentially variable liveness time. This should not provide any exploit opportunities, especially because // the BridgeAdmin state (including the liveness value) is permissioned to the cross domained owner. RelayData memory relayData = RelayData({ relayState: RelayState.Pending, slowRelayer: msg.sender, relayId: numberOfRelays++, // Note: Increment numberOfRelays at the same time as setting relayId to its current value. realizedLpFeePct: realizedLpFeePct, priceRequestTime: priceRequestTime, proposerBond: proposerBond, finalFee: l1TokenFinalFee }); bytes32 relayHash = _getRelayHash(depositData, relayData); relays[depositHash] = _getRelayDataHash(relayData); bytes32 instantRelayHash = _getInstantRelayHash(depositHash, relayData); require( // Can only speed up a pending relay without an existing instant relay associated with it. instantRelays[instantRelayHash] == address(0), "Relay cannot be sped up" ); // Sanity check that pool has enough balance to cover relay amount + proposer reward. Reward amount will be // paid on settlement after the OptimisticOracle price request has passed the challenge period. // Note: liquidReserves should always be <= balance - bonds. require(liquidReserves - pendingReserves >= depositData.amount, "Insufficient pool balance"); // Compute total proposal bond and pull from caller so that the OptimisticOracle can pull it from here. uint256 totalBond = proposerBond + l1TokenFinalFee; // Pull relay amount minus fees from caller and send to the deposit l1Recipient. The total fees paid is the sum // of the LP fees, the relayer fees and the instant relay fee. uint256 feesTotal = _getAmountFromPct( relayData.realizedLpFeePct + depositData.slowRelayFeePct + depositData.instantRelayFeePct, depositData.amount ); // If the L1 token is WETH then: a) pull WETH from instant relayer b) unwrap WETH c) send ETH to recipient. uint256 recipientAmount = depositData.amount - feesTotal; bonds += totalBond; pendingReserves += depositData.amount; // Book off maximum liquidity used by this relay in the pending reserves. instantRelays[instantRelayHash] = msg.sender; l1Token.safeTransferFrom(msg.sender, address(this), recipientAmount + totalBond); // If this is a weth pool then unwrap and send eth. if (isWethPool) { _unwrapWETHTo(depositData.l1Recipient, recipientAmount); // Else, this is a normal ERC20 token. Send to recipient. } else l1Token.safeTransfer(depositData.l1Recipient, recipientAmount); emit DepositRelayed(depositHash, depositData, relayData, relayHash); emit RelaySpedUp(depositHash, msg.sender, relayData); } /** * @notice Called by Disputer to dispute an ongoing relay. * @dev The result of this method is to always throw out the relay, providing an opportunity for another relay for * the same deposit. Between the disputer and proposer, whoever is incorrect loses their bond. Whoever is correct * gets it back + a payout. * @dev Caller must have approved this contract to spend the total bond + amount - fees for `l1Token`. * @param depositData the deposit data struct containing all the user's deposit information. * @param relayData RelayData logged in the disputed relay. */ function disputeRelay(DepositData memory depositData, RelayData memory relayData) public nonReentrant() { require(relayData.priceRequestTime + optimisticOracleLiveness > getCurrentTime(), "Past liveness"); require(relayData.relayState == RelayState.Pending, "Not disputable"); // Validate the input data. bytes32 depositHash = _getDepositHash(depositData); _validateRelayDataHash(depositHash, relayData); // Submit the proposal and dispute to the OO. bytes32 relayHash = _getRelayHash(depositData, relayData); // Note: in some cases this will fail due to changes in the OO and the method will refund the relayer. bool success = _requestProposeDispute( relayData.slowRelayer, msg.sender, relayData.proposerBond, relayData.finalFee, _getRelayAncillaryData(relayHash) ); // Drop the relay and remove the bond from the tracked bonds. bonds -= relayData.finalFee + relayData.proposerBond; pendingReserves -= depositData.amount; delete relays[depositHash]; if (success) emit RelayDisputed(depositHash, _getRelayDataHash(relayData), msg.sender); else emit RelayCanceled(depositHash, _getRelayDataHash(relayData), msg.sender); } /** * @notice Called by Relayer to execute a slow relay from L2 to L1, fulfilling a corresponding deposit order. * @dev There can only be one pending relay for a deposit. * @dev Caller must have approved this contract to spend the total bond + amount - fees for `l1Token`. * @param depositData the deposit data struct containing all the user's deposit information. * @param realizedLpFeePct LP fee calculated off-chain considering the L1 pool liquidity at deposit time, before * quoteTimestamp. The OO acts to verify the correctness of this realized fee. Cannot exceed 50%. */ function relayDeposit(DepositData memory depositData, uint64 realizedLpFeePct) public nonReentrant() { // The realizedLPFeePct should never be greater than 0.5e18 and the slow and instant relay fees should never be // more than 0.25e18 each. Therefore, the sum of all fee types can never exceed 1e18 (or 100%). require( depositData.slowRelayFeePct <= 0.25e18 && depositData.instantRelayFeePct <= 0.25e18 && realizedLpFeePct <= 0.5e18, "Invalid fees" ); // Check if there is a pending relay for this deposit. bytes32 depositHash = _getDepositHash(depositData); // Note: A disputed relay deletes the stored relay hash and enables this require statement to pass. require(relays[depositHash] == bytes32(0), "Pending relay exists"); // If no pending relay for this deposit, then associate the caller's relay attempt with it. uint32 priceRequestTime = uint32(getCurrentTime()); uint256 proposerBond = _getProposerBond(depositData.amount); // Save hash of new relay attempt parameters. // Note: The liveness for this relay can be changed in the BridgeAdmin, which means that each relay has a // potentially variable liveness time. This should not provide any exploit opportunities, especially because // the BridgeAdmin state (including the liveness value) is permissioned to the cross domained owner. RelayData memory relayData = RelayData({ relayState: RelayState.Pending, slowRelayer: msg.sender, relayId: numberOfRelays++, // Note: Increment numberOfRelays at the same time as setting relayId to its current value. realizedLpFeePct: realizedLpFeePct, priceRequestTime: priceRequestTime, proposerBond: proposerBond, finalFee: l1TokenFinalFee }); relays[depositHash] = _getRelayDataHash(relayData); bytes32 relayHash = _getRelayHash(depositData, relayData); // Sanity check that pool has enough balance to cover relay amount + proposer reward. Reward amount will be // paid on settlement after the OptimisticOracle price request has passed the challenge period. // Note: liquidReserves should always be <= balance - bonds. require(liquidReserves - pendingReserves >= depositData.amount, "Insufficient pool balance"); // Compute total proposal bond and pull from caller so that the OptimisticOracle can pull it from here. uint256 totalBond = proposerBond + l1TokenFinalFee; pendingReserves += depositData.amount; // Book off maximum liquidity used by this relay in the pending reserves. bonds += totalBond; l1Token.safeTransferFrom(msg.sender, address(this), totalBond); emit DepositRelayed(depositHash, depositData, relayData, relayHash); } /** * @notice Instantly relay a deposit amount minus fees to the l1Recipient. Instant relayer earns a reward following * the pending relay challenge period. * @dev We assume that the caller has performed an off-chain check that the deposit data they are attempting to * relay is valid. If the deposit data is invalid, then the instant relayer has no recourse to receive their funds * back after the invalid deposit data is disputed. Moreover, no one will be able to resubmit a relay for the * invalid deposit data because they know it will get disputed again. On the other hand, if the deposit data is * valid, then even if it is falsely disputed, the instant relayer will eventually get reimbursed because someone * else will be incentivized to resubmit the relay to earn slow relayer rewards. Once the valid relay is finalized, * the instant relayer will be reimbursed. Therefore, the caller has the same responsibility as the disputer in * validating the relay data. * @dev Caller must have approved this contract to spend the deposit amount of L1 tokens to relay. There can only * be one instant relayer per relay attempt. You cannot speed up a relay that is past liveness. * @param depositData Unique set of L2 deposit data that caller is trying to instantly relay. * @param relayData Parameters of Relay that caller is attempting to speedup. Must hash to the stored relay hash * for this deposit or this method will revert. */ function speedUpRelay(DepositData memory depositData, RelayData memory relayData) public nonReentrant() { bytes32 depositHash = _getDepositHash(depositData); _validateRelayDataHash(depositHash, relayData); bytes32 instantRelayHash = _getInstantRelayHash(depositHash, relayData); require( // Can only speed up a pending relay without an existing instant relay associated with it. getCurrentTime() < relayData.priceRequestTime + optimisticOracleLiveness && relayData.relayState == RelayState.Pending && instantRelays[instantRelayHash] == address(0), "Relay cannot be sped up" ); instantRelays[instantRelayHash] = msg.sender; // Pull relay amount minus fees from caller and send to the deposit l1Recipient. The total fees paid is the sum // of the LP fees, the relayer fees and the instant relay fee. uint256 feesTotal = _getAmountFromPct( relayData.realizedLpFeePct + depositData.slowRelayFeePct + depositData.instantRelayFeePct, depositData.amount ); // If the L1 token is WETH then: a) pull WETH from instant relayer b) unwrap WETH c) send ETH to recipient. uint256 recipientAmount = depositData.amount - feesTotal; if (isWethPool) { l1Token.safeTransferFrom(msg.sender, address(this), recipientAmount); _unwrapWETHTo(depositData.l1Recipient, recipientAmount); // Else, this is a normal ERC20 token. Send to recipient. } else l1Token.safeTransferFrom(msg.sender, depositData.l1Recipient, recipientAmount); emit RelaySpedUp(depositHash, msg.sender, relayData); } /** * @notice Reward relayers if a pending relay price request has a price available on the OptimisticOracle. Mark * the relay as complete. * @dev We use the relayData and depositData to compute the ancillary data that the relay price request is uniquely * associated with on the OptimisticOracle. If the price request passed in does not match the pending relay price * request, then this will revert. * @param depositData Unique set of L2 deposit data that caller is trying to settle a relay for. * @param relayData Parameters of Relay that caller is attempting to settle. Must hash to the stored relay hash * for this deposit. */ function settleRelay(DepositData memory depositData, RelayData memory relayData) public nonReentrant() { bytes32 depositHash = _getDepositHash(depositData); _validateRelayDataHash(depositHash, relayData); require(relayData.relayState == RelayState.Pending, "Already settled"); uint32 expirationTime = relayData.priceRequestTime + optimisticOracleLiveness; require(expirationTime <= getCurrentTime(), "Not settleable yet"); // Note: this check is to give the relayer a small, but reasonable amount of time to complete the relay before // before it can be "stolen" by someone else. This is to ensure there is an incentive to settle relays quickly. require( msg.sender == relayData.slowRelayer || getCurrentTime() > expirationTime + 15 minutes, "Not slow relayer" ); // Update the relay state to Finalized. This prevents any re-settling of a relay. relays[depositHash] = _getRelayDataHash( RelayData({ relayState: RelayState.Finalized, slowRelayer: relayData.slowRelayer, relayId: relayData.relayId, realizedLpFeePct: relayData.realizedLpFeePct, priceRequestTime: relayData.priceRequestTime, proposerBond: relayData.proposerBond, finalFee: relayData.finalFee }) ); // Reward relayers and pay out l1Recipient. // At this point there are two possible cases: // - This was a slow relay: In this case, a) pay the slow relayer their reward and b) pay the l1Recipient of the // amount minus the realized LP fee and the slow Relay fee. The transfer was not sped up so no instant fee. // - This was an instant relay: In this case, a) pay the slow relayer their reward and b) pay the instant relayer // the full bridging amount, minus the realized LP fee and minus the slow relay fee. When the instant // relayer called speedUpRelay they were docked this same amount, minus the instant relayer fee. As a // result, they are effectively paid what they spent when speeding up the relay + the instantRelayFee. uint256 instantRelayerOrRecipientAmount = depositData.amount - _getAmountFromPct(relayData.realizedLpFeePct + depositData.slowRelayFeePct, depositData.amount); // Refund the instant relayer iff the instant relay params match the approved relay. bytes32 instantRelayHash = _getInstantRelayHash(depositHash, relayData); address instantRelayer = instantRelays[instantRelayHash]; // If this is the WETH pool and the instant relayer is is address 0x0 (i.e the relay was not sped up) then: // a) withdraw WETH to ETH and b) send the ETH to the recipient. if (isWethPool && instantRelayer == address(0)) { _unwrapWETHTo(depositData.l1Recipient, instantRelayerOrRecipientAmount); // Else, this is a normal slow relay being finalizes where the contract sends ERC20 to the recipient OR this // is the finalization of an instant relay where we need to reimburse the instant relayer in WETH. } else l1Token.safeTransfer( instantRelayer != address(0) ? instantRelayer : depositData.l1Recipient, instantRelayerOrRecipientAmount ); // There is a fee and a bond to pay out. The fee goes to whoever settles. The bond always goes back to the // slow relayer. // Note: for gas efficiency, we use an if so we can combine these transfers in the event that they are the same // address. uint256 slowRelayerReward = _getAmountFromPct(depositData.slowRelayFeePct, depositData.amount); uint256 totalBond = relayData.finalFee + relayData.proposerBond; if (relayData.slowRelayer == msg.sender) l1Token.safeTransfer(relayData.slowRelayer, slowRelayerReward + totalBond); else { l1Token.safeTransfer(relayData.slowRelayer, totalBond); l1Token.safeTransfer(msg.sender, slowRelayerReward); } uint256 totalReservesSent = instantRelayerOrRecipientAmount + slowRelayerReward; // Update reserves by amounts changed and allocated LP fees. pendingReserves -= depositData.amount; liquidReserves -= totalReservesSent; utilizedReserves += int256(totalReservesSent); bonds -= totalBond; _updateAccumulatedLpFees(); _allocateLpFees(_getAmountFromPct(relayData.realizedLpFeePct, depositData.amount)); emit RelaySettled(depositHash, msg.sender, relayData); // Clean up state storage and receive gas refund. This also prevents `priceDisputed()` from being able to reset // this newly Finalized relay state. delete instantRelays[instantRelayHash]; } /** * @notice Synchronize any balance changes in this contract with the utilized & liquid reserves. This would be done * at the conclusion of an L2 -> L1 token transfer via the canonical token bridge. */ function sync() public nonReentrant() { _sync(); } /** * @notice Computes the exchange rate between LP tokens and L1Tokens. Used when adding/removing liquidity. * @return The updated exchange rate between LP tokens and L1 tokens. */ function exchangeRateCurrent() public nonReentrant() returns (uint256) { return _exchangeRateCurrent(); } /** * @notice Computes the current liquidity utilization ratio. * @dev Used in computing realizedLpFeePct off-chain. * @return The current utilization ratio. */ function liquidityUtilizationCurrent() public nonReentrant() returns (uint256) { return _liquidityUtilizationPostRelay(0); } /** * @notice Computes the liquidity utilization ratio post a relay of known size. * @dev Used in computing realizedLpFeePct off-chain. * @param relayedAmount Size of the relayed deposit to factor into the utilization calculation. * @return The updated utilization ratio accounting for a new `relayedAmount`. */ function liquidityUtilizationPostRelay(uint256 relayedAmount) public nonReentrant() returns (uint256) { return _liquidityUtilizationPostRelay(relayedAmount); } /** * @notice Return both the current utilization value and liquidity utilization post the relay. * @dev Used in computing realizedLpFeePct off-chain. * @param relayedAmount Size of the relayed deposit to factor into the utilization calculation. * @return utilizationCurrent The current utilization ratio. * @return utilizationPostRelay The updated utilization ratio accounting for a new `relayedAmount`. */ function getLiquidityUtilization(uint256 relayedAmount) public nonReentrant() returns (uint256 utilizationCurrent, uint256 utilizationPostRelay) { return (_liquidityUtilizationPostRelay(0), _liquidityUtilizationPostRelay(relayedAmount)); } /** * @notice Updates the address stored in this contract for the OptimisticOracle and the Store to the latest versions * set in the the Finder. Also pull finalFee Store these as local variables to make relay methods gas efficient. * @dev There is no risk of leaving this function public for anyone to call as in all cases we want the addresses * in this contract to map to the latest version in the Finder and store the latest final fee. */ function syncUmaEcosystemParams() public nonReentrant() { FinderInterface finder = FinderInterface(bridgeAdmin.finder()); optimisticOracle = SkinnyOptimisticOracleInterface( finder.getImplementationAddress(OracleInterfaces.SkinnyOptimisticOracle) ); store = StoreInterface(finder.getImplementationAddress(OracleInterfaces.Store)); l1TokenFinalFee = store.computeFinalFee(address(l1Token)).rawValue; } /** * @notice Updates the values of stored constants for the proposerBondPct, optimisticOracleLiveness and identifier * to that set in the bridge Admin. We store these as local variables to make the relay methods more gas efficient. * @dev There is no risk of leaving this function public for anyone to call as in all cases we want these values * in this contract to map to the latest version set in the BridgeAdmin. */ function syncWithBridgeAdminParams() public nonReentrant() { proposerBondPct = bridgeAdmin.proposerBondPct(); optimisticOracleLiveness = bridgeAdmin.optimisticOracleLiveness(); identifier = bridgeAdmin.identifier(); } /************************************ * ADMIN FUNCTIONS * ************************************/ /** * @notice Enable the current bridge admin to transfer admin to to a new address. * @param _newAdmin Admin address of the new admin. */ function changeAdmin(address _newAdmin) public override nonReentrant() { require(msg.sender == address(bridgeAdmin)); bridgeAdmin = BridgeAdminInterface(_newAdmin); emit BridgePoolAdminTransferred(msg.sender, _newAdmin); } /************************************ * VIEW FUNCTIONS * ************************************/ /** * @notice Computes the current amount of unallocated fees that have accumulated from the previous time this the * contract was called. */ function getAccumulatedFees() public view nonReentrantView() returns (uint256) { return _getAccumulatedFees(); } /** * @notice Returns ancillary data containing all relevant Relay data that voters can format into UTF8 and use to * determine if the relay is valid. * @dev Helpful method to test that ancillary data is constructed properly. We should consider removing if we don't * anticipate off-chain bots or users to call this method. * @param depositData Contains L2 deposit information used by off-chain validators to validate relay. * @param relayData Contains relay information used by off-chain validators to validate relay. * @return bytes New ancillary data that can be decoded into UTF8. */ function getRelayAncillaryData(DepositData memory depositData, RelayData memory relayData) public view nonReentrantView() returns (bytes memory) { return _getRelayAncillaryData(_getRelayHash(depositData, relayData)); } /************************************** * INTERNAL & PRIVATE FUNCTIONS * **************************************/ function _liquidityUtilizationPostRelay(uint256 relayedAmount) internal returns (uint256) { _sync(); // Fetch any balance changes due to token bridging finalization and factor them in. // liquidityUtilizationRatio := // (relayedAmount + pendingReserves + max(utilizedReserves,0)) / (liquidReserves + max(utilizedReserves,0)) // UtilizedReserves has a dual meaning: if it's greater than zero then it represents funds pending in the bridge // that will flow from L2 to L1. In this case, we can use it normally in the equation. However, if it is // negative, then it is already counted in liquidReserves. This occurs if tokens are transferred directly to the // contract. In this case, ignore it as it is captured in liquid reserves and has no meaning in the numerator. uint256 flooredUtilizedReserves = utilizedReserves > 0 ? uint256(utilizedReserves) : 0; uint256 numerator = relayedAmount + pendingReserves + flooredUtilizedReserves; uint256 denominator = liquidReserves + flooredUtilizedReserves; // If the denominator equals zero, return 1e18 (max utilization). if (denominator == 0) return 1e18; // In all other cases, return the utilization ratio. return (numerator * 1e18) / denominator; } function _sync() internal { // Check if the l1Token balance of the contract is greater than the liquidReserves. If it is then the bridging // action from L2 -> L1 has concluded and the local accounting can be updated. uint256 l1TokenBalance = l1Token.balanceOf(address(this)) - bonds; if (l1TokenBalance > liquidReserves) { // utilizedReserves can go to less than zero. This will happen if the accumulated fees exceeds the current // outstanding utilization. In other words, if outstanding bridging transfers are 0 then utilizedReserves // will equal the total LP fees accumulated over all time. utilizedReserves -= int256(l1TokenBalance - liquidReserves); liquidReserves = l1TokenBalance; } } function _exchangeRateCurrent() internal returns (uint256) { if (totalSupply() == 0) return 1e18; // initial rate is 1 pre any mint action. // First, update fee counters and local accounting of finalized transfers from L2 -> L1. _updateAccumulatedLpFees(); // Accumulate all allocated fees from the last time this method was called. _sync(); // Fetch any balance changes due to token bridging finalization and factor them in. // ExchangeRate := (liquidReserves + utilizedReserves - undistributedLpFees) / lpTokenSupply uint256 numerator = liquidReserves - undistributedLpFees; if (utilizedReserves > 0) numerator += uint256(utilizedReserves); else numerator -= uint256(utilizedReserves * -1); return (numerator * 1e18) / totalSupply(); } // Return UTF8-decodable ancillary data for relay price request associated with relay hash. function _getRelayAncillaryData(bytes32 relayHash) private pure returns (bytes memory) { return AncillaryData.appendKeyValueBytes32("", "relayHash", relayHash); } // Returns hash of unique relay and deposit event. This is added to the relay request's ancillary data. function _getRelayHash(DepositData memory depositData, RelayData memory relayData) private view returns (bytes32) { return keccak256(abi.encode(depositData, relayData.relayId, relayData.realizedLpFeePct, address(l1Token))); } // Return hash of relay data, which is stored in state and mapped to a deposit hash. function _getRelayDataHash(RelayData memory relayData) private pure returns (bytes32) { return keccak256(abi.encode(relayData)); } // Reverts if the stored relay data hash for `depositHash` does not match `_relayData`. function _validateRelayDataHash(bytes32 depositHash, RelayData memory relayData) private view { require( relays[depositHash] == _getRelayDataHash(relayData), "Hashed relay params do not match existing relay hash for deposit" ); } // Return hash of unique instant relay and deposit event. This is stored in state and mapped to a deposit hash. function _getInstantRelayHash(bytes32 depositHash, RelayData memory relayData) private pure returns (bytes32) { // Only include parameters that affect the "correctness" of an instant relay. For example, the realized LP fee // % directly affects how many tokens the instant relayer needs to send to the user, whereas the address of the // instant relayer does not matter for determining whether an instant relay is "correct". return keccak256(abi.encode(depositHash, relayData.realizedLpFeePct)); } function _getAccumulatedFees() internal view returns (uint256) { // UnallocatedLpFees := min(undistributedLpFees*lpFeeRatePerSecond*timeFromLastInteraction,undistributedLpFees) // The min acts to pay out all fees in the case the equation returns more than the remaining a fees. uint256 possibleUnpaidFees = (undistributedLpFees * lpFeeRatePerSecond * (getCurrentTime() - lastLpFeeUpdate)) / (1e18); return possibleUnpaidFees < undistributedLpFees ? possibleUnpaidFees : undistributedLpFees; } // Update internal fee counters by adding in any accumulated fees from the last time this logic was called. function _updateAccumulatedLpFees() internal { // Calculate the unallocatedAccumulatedFees from the last time the contract was called. uint256 unallocatedAccumulatedFees = _getAccumulatedFees(); // Decrement the undistributedLpFees by the amount of accumulated fees. undistributedLpFees = undistributedLpFees - unallocatedAccumulatedFees; lastLpFeeUpdate = uint32(getCurrentTime()); } // Allocate fees to the LPs by incrementing counters. function _allocateLpFees(uint256 allocatedLpFees) internal { // Add to the total undistributed LP fees and the utilized reserves. Adding it to the utilized reserves acts to // track the fees while they are in transit. undistributedLpFees += allocatedLpFees; utilizedReserves += int256(allocatedLpFees); } function _getAmountFromPct(uint64 percent, uint256 amount) private pure returns (uint256) { return (percent * amount) / 1e18; } function _getProposerBond(uint256 amount) private view returns (uint256) { return _getAmountFromPct(proposerBondPct, amount); } function _getDepositHash(DepositData memory depositData) private view returns (bytes32) { return keccak256(abi.encode(depositData, address(l1Token))); } // Proposes new price of True for relay event associated with `customAncillaryData` to optimistic oracle. If anyone // disagrees with the relay parameters and whether they map to an L2 deposit, they can dispute with the oracle. function _requestProposeDispute( address proposer, address disputer, uint256 proposerBond, uint256 finalFee, bytes memory customAncillaryData ) private returns (bool) { uint256 totalBond = finalFee + proposerBond; l1Token.safeApprove(address(optimisticOracle), totalBond); try optimisticOracle.requestAndProposePriceFor( identifier, uint32(getCurrentTime()), customAncillaryData, IERC20(l1Token), // Set reward to 0, since we'll settle proposer reward payouts directly from this contract after a relay // proposal has passed the challenge period. 0, // Set the Optimistic oracle proposer bond for the price request. proposerBond, // Set the Optimistic oracle liveness for the price request. optimisticOracleLiveness, proposer, // Canonical value representing "True"; i.e. the proposed relay is valid. int256(1e18) ) returns (uint256 bondSpent) { if (bondSpent < totalBond) { // If the OO pulls less (due to a change in final fee), refund the proposer. uint256 refund = totalBond - bondSpent; l1Token.safeTransfer(proposer, refund); l1Token.safeApprove(address(optimisticOracle), 0); totalBond = bondSpent; } } catch { // If there's an error in the OO, this means something has changed to make this request undisputable. // To ensure the request does not go through by default, refund the proposer and return early, allowing // the calling method to delete the request, but with no additional recourse by the OO. l1Token.safeTransfer(proposer, totalBond); l1Token.safeApprove(address(optimisticOracle), 0); // Return early noting that the attempt at a proposal + dispute did not succeed. return false; } SkinnyOptimisticOracleInterface.Request memory request = SkinnyOptimisticOracleInterface.Request({ proposer: proposer, disputer: address(0), currency: IERC20(l1Token), settled: false, proposedPrice: int256(1e18), resolvedPrice: 0, expirationTime: getCurrentTime() + optimisticOracleLiveness, reward: 0, finalFee: totalBond - proposerBond, bond: proposerBond, customLiveness: uint256(optimisticOracleLiveness) }); // Note: don't pull funds until here to avoid any transfers that aren't needed. l1Token.safeTransferFrom(msg.sender, address(this), totalBond); l1Token.safeApprove(address(optimisticOracle), totalBond); // Dispute the request that we just sent. optimisticOracle.disputePriceFor( identifier, uint32(getCurrentTime()), customAncillaryData, request, disputer, address(this) ); // Return true to denote that the proposal + dispute calls succeeded. return true; } // Unwraps ETH and does a transfer to a recipient address. If the recipient is a smart contract then sends WETH. function _unwrapWETHTo(address payable to, uint256 amount) internal { if (address(to).isContract()) { l1Token.safeTransfer(to, amount); } else { WETH9Like(address(l1Token)).withdraw(amount); to.transfer(amount); } } // Added to enable the BridgePool to receive ETH. used when unwrapping Weth. receive() external payable {} } /** * @notice This is the BridgePool contract that should be deployed on live networks. It is exactly the same as the * regular BridgePool contract, but it overrides getCurrentTime to make the call a simply return block.timestamp with * no branching or storage queries. This is done to save gas. */ contract BridgePoolProd is BridgePool { constructor( string memory _lpTokenName, string memory _lpTokenSymbol, address _bridgeAdmin, address _l1Token, uint64 _lpFeeRatePerSecond, bool _isWethPool, address _timer ) BridgePool(_lpTokenName, _lpTokenSymbol, _bridgeAdmin, _l1Token, _lpFeeRatePerSecond, _isWethPool, _timer) {} function getCurrentTime() public view virtual override returns (uint256) { return block.timestamp; } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; /** * @notice Helper view methods designed to be called by BridgePool contracts. */ interface BridgeAdminInterface { event SetDepositContracts( uint256 indexed chainId, address indexed l2DepositContract, address indexed l2MessengerContract ); event SetCrossDomainAdmin(uint256 indexed chainId, address indexed newAdmin); event SetRelayIdentifier(bytes32 indexed identifier); event SetOptimisticOracleLiveness(uint32 indexed liveness); event SetProposerBondPct(uint64 indexed proposerBondPct); event WhitelistToken(uint256 chainId, address indexed l1Token, address indexed l2Token, address indexed bridgePool); event SetMinimumBridgingDelay(uint256 indexed chainId, uint64 newMinimumBridgingDelay); event DepositsEnabled(uint256 indexed chainId, address indexed l2Token, bool depositsEnabled); event BridgePoolsAdminTransferred(address[] bridgePools, address indexed newAdmin); function finder() external view returns (address); struct DepositUtilityContracts { address depositContract; // L2 deposit contract where cross-chain relays originate. address messengerContract; // L1 helper contract that can send a message to the L2 with the mapped network ID. } function depositContracts(uint256) external view returns (DepositUtilityContracts memory); struct L1TokenRelationships { mapping(uint256 => address) l2Tokens; // L2 Chain Id to l2Token address. address bridgePool; } function whitelistedTokens(address, uint256) external view returns (address l2Token, address bridgePool); function optimisticOracleLiveness() external view returns (uint32); function proposerBondPct() external view returns (uint64); function identifier() external view returns (bytes32); }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; interface BridgePoolInterface { function l1Token() external view returns (IERC20); function changeAdmin(address newAdmin) external; }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "../interfaces/OptimisticOracleInterface.sol"; /** * @title Interface for the gas-cost-reduced version of the OptimisticOracle. * @notice Differences from normal OptimisticOracle: * - refundOnDispute: flag is removed, by default there are no refunds on disputes. * - customizing request parameters: In the OptimisticOracle, parameters like `bond` and `customLiveness` can be reset * after a request is already made via `requestPrice`. In the SkinnyOptimisticOracle, these parameters can only be * set in `requestPrice`, which has an expanded input set. * - settleAndGetPrice: Replaced by `settle`, which can only be called once per settleable request. The resolved price * can be fetched via the `Settle` event or the return value of `settle`. * - general changes to interface: Functions that interact with existing requests all require the parameters of the * request to modify to be passed as input. These parameters must match with the existing request parameters or the * function will revert. This change reflects the internal refactor to store hashed request parameters instead of the * full request struct. * @dev Interface used by financial contracts to interact with the Oracle. Voters will use a different interface. */ abstract contract SkinnyOptimisticOracleInterface { // Struct representing a price request. Note that this differs from the OptimisticOracleInterface's Request struct // in that refundOnDispute is removed. struct Request { address proposer; // Address of the proposer. address disputer; // Address of the disputer. IERC20 currency; // ERC20 token used to pay rewards and fees. bool settled; // True if the request is settled. int256 proposedPrice; // Price that the proposer submitted. int256 resolvedPrice; // Price resolved once the request is settled. uint256 expirationTime; // Time at which the request auto-settles without a dispute. uint256 reward; // Amount of the currency to pay to the proposer on settlement. uint256 finalFee; // Final fee to pay to the Store upon request to the DVM. uint256 bond; // Bond that the proposer and disputer must pay on top of the final fee. uint256 customLiveness; // Custom liveness value set by the requester. } // This value must be <= the Voting contract's `ancillaryBytesLimit` value otherwise it is possible // that a price can be requested to this contract successfully, but cannot be disputed because the DVM refuses // to accept a price request made with ancillary data length over a certain size. uint256 public constant ancillaryBytesLimit = 8192; /** * @notice Requests a new price. * @param identifier price identifier being requested. * @param timestamp timestamp of the price being requested. * @param ancillaryData ancillary data representing additional args being passed with the price request. * @param currency ERC20 token used for payment of rewards and fees. Must be approved for use with the DVM. * @param reward reward offered to a successful proposer. Will be pulled from the caller. Note: this can be 0, * which could make sense if the contract requests and proposes the value in the same call or * provides its own reward system. * @param bond custom proposal bond to set for request. If set to 0, defaults to the final fee. * @param customLiveness custom proposal liveness to set for request. * @return totalBond default bond + final fee that the proposer and disputer will be required to pay. */ function requestPrice( bytes32 identifier, uint32 timestamp, bytes memory ancillaryData, IERC20 currency, uint256 reward, uint256 bond, uint256 customLiveness ) external virtual returns (uint256 totalBond); /** * @notice Proposes a price value on another address' behalf. Note: this address will receive any rewards that come * from this proposal. However, any bonds are pulled from the caller. * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @param request price request parameters whose hash must match the request that the caller wants to * propose a price for. * @param proposer address to set as the proposer. * @param proposedPrice price being proposed. * @return totalBond the amount that's pulled from the caller's wallet as a bond. The bond will be returned to * the proposer once settled if the proposal is correct. */ function proposePriceFor( address requester, bytes32 identifier, uint32 timestamp, bytes memory ancillaryData, Request memory request, address proposer, int256 proposedPrice ) public virtual returns (uint256 totalBond); /** * @notice Proposes a price value where caller is the proposer. * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @param request price request parameters whose hash must match the request that the caller wants to * propose a price for. * @param proposedPrice price being proposed. * @return totalBond the amount that's pulled from the caller's wallet as a bond. The bond will be returned to * the proposer once settled if the proposal is correct. */ function proposePrice( address requester, bytes32 identifier, uint32 timestamp, bytes memory ancillaryData, Request memory request, int256 proposedPrice ) external virtual returns (uint256 totalBond); /** * @notice Combines logic of requestPrice and proposePrice while taking advantage of gas savings from not having to * overwrite Request params that a normal requestPrice() => proposePrice() flow would entail. Note: The proposer * will receive any rewards that come from this proposal. However, any bonds are pulled from the caller. * @dev The caller is the requester, but the proposer can be customized. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @param currency ERC20 token used for payment of rewards and fees. Must be approved for use with the DVM. * @param reward reward offered to a successful proposer. Will be pulled from the caller. Note: this can be 0, * which could make sense if the contract requests and proposes the value in the same call or * provides its own reward system. * @param bond custom proposal bond to set for request. If set to 0, defaults to the final fee. * @param customLiveness custom proposal liveness to set for request. * @param proposer address to set as the proposer. * @param proposedPrice price being proposed. * @return totalBond the amount that's pulled from the caller's wallet as a bond. The bond will be returned to * the proposer once settled if the proposal is correct. */ function requestAndProposePriceFor( bytes32 identifier, uint32 timestamp, bytes memory ancillaryData, IERC20 currency, uint256 reward, uint256 bond, uint256 customLiveness, address proposer, int256 proposedPrice ) external virtual returns (uint256 totalBond); /** * @notice Disputes a price request with an active proposal on another address' behalf. Note: this address will * receive any rewards that come from this dispute. However, any bonds are pulled from the caller. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @param request price request parameters whose hash must match the request that the caller wants to * dispute. * @param disputer address to set as the disputer. * @param requester sender of the initial price request. * @return totalBond the amount that's pulled from the caller's wallet as a bond. The bond will be returned to * the disputer once settled if the dispute was valid (the proposal was incorrect). */ function disputePriceFor( bytes32 identifier, uint32 timestamp, bytes memory ancillaryData, Request memory request, address disputer, address requester ) public virtual returns (uint256 totalBond); /** * @notice Disputes a price request with an active proposal where caller is the disputer. * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @param request price request parameters whose hash must match the request that the caller wants to * dispute. * @return totalBond the amount that's pulled from the caller's wallet as a bond. The bond will be returned to * the disputer once settled if the dispute was valid (the proposal was incorrect). */ function disputePrice( address requester, bytes32 identifier, uint32 timestamp, bytes memory ancillaryData, Request memory request ) external virtual returns (uint256 totalBond); /** * @notice Attempts to settle an outstanding price request. Will revert if it isn't settleable. * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @param request price request parameters whose hash must match the request that the caller wants to * settle. * @return payout the amount that the "winner" (proposer or disputer) receives on settlement. This amount includes * the returned bonds as well as additional rewards. * @return resolvedPrice the price that the request settled to. */ function settle( address requester, bytes32 identifier, uint32 timestamp, bytes memory ancillaryData, Request memory request ) external virtual returns (uint256 payout, int256 resolvedPrice); /** * @notice Computes the current state of a price request. See the State enum for more details. * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @param request price request parameters. * @return the State. */ function getState( address requester, bytes32 identifier, uint32 timestamp, bytes memory ancillaryData, Request memory request ) external virtual returns (OptimisticOracleInterface.State); /** * @notice Checks if a given request has resolved, expired or been settled (i.e the optimistic oracle has a price). * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @param request price request parameters. The hash of these parameters must match with the request hash that is * associated with the price request unique ID {requester, identifier, timestamp, ancillaryData}, or this method * will revert. * @return boolean indicating true if price exists and false if not. */ function hasPrice( address requester, bytes32 identifier, uint32 timestamp, bytes memory ancillaryData, Request memory request ) public virtual returns (bool); /** * @notice Generates stamped ancillary data in the format that it would be used in the case of a price dispute. * @param ancillaryData ancillary data of the price being requested. * @param requester sender of the initial price request. * @return the stamped ancillary bytes. */ function stampAncillaryData(bytes memory ancillaryData, address requester) public pure virtual returns (bytes memory); }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "../../common/implementation/FixedPoint.sol"; /** * @title Interface that allows financial contracts to pay oracle fees for their use of the system. */ interface StoreInterface { /** * @notice Pays Oracle fees in ETH to the store. * @dev To be used by contracts whose margin currency is ETH. */ function payOracleFees() external payable; /** * @notice Pays oracle fees in the margin currency, erc20Address, to the store. * @dev To be used if the margin currency is an ERC20 token rather than ETH. * @param erc20Address address of the ERC20 token used to pay the fee. * @param amount number of tokens to transfer. An approval for at least this amount must exist. */ function payOracleFeesErc20(address erc20Address, FixedPoint.Unsigned calldata amount) external; /** * @notice Computes the regular oracle fees that a contract should pay for a period. * @param startTime defines the beginning time from which the fee is paid. * @param endTime end time until which the fee is paid. * @param pfc "profit from corruption", or the maximum amount of margin currency that a * token sponsor could extract from the contract through corrupting the price feed in their favor. * @return regularFee amount owed for the duration from start to end time for the given pfc. * @return latePenalty for paying the fee after the deadline. */ function computeRegularFee( uint256 startTime, uint256 endTime, FixedPoint.Unsigned calldata pfc ) external view returns (FixedPoint.Unsigned memory regularFee, FixedPoint.Unsigned memory latePenalty); /** * @notice Computes the final oracle fees that a contract should pay at settlement. * @param currency token used to pay the final fee. * @return finalFee amount due. */ function computeFinalFee(address currency) external view returns (FixedPoint.Unsigned memory); }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; /** * @title Provides addresses of the live contracts implementing certain interfaces. * @dev Examples are the Oracle or Store interfaces. */ interface FinderInterface { /** * @notice Updates the address of the contract that implements `interfaceName`. * @param interfaceName bytes32 encoding of the interface name that is either changed or registered. * @param implementationAddress address of the deployed contract that implements the interface. */ function changeImplementationAddress(bytes32 interfaceName, address implementationAddress) external; /** * @notice Gets the address of the contract that implements the given `interfaceName`. * @param interfaceName queried interface. * @return implementationAddress address of the deployed contract that implements the interface. */ function getImplementationAddress(bytes32 interfaceName) external view returns (address); }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; /** * @title Stores common interface names used throughout the DVM by registration in the Finder. */ library OracleInterfaces { bytes32 public constant Oracle = "Oracle"; bytes32 public constant IdentifierWhitelist = "IdentifierWhitelist"; bytes32 public constant Store = "Store"; bytes32 public constant FinancialContractsAdmin = "FinancialContractsAdmin"; bytes32 public constant Registry = "Registry"; bytes32 public constant CollateralWhitelist = "CollateralWhitelist"; bytes32 public constant OptimisticOracle = "OptimisticOracle"; bytes32 public constant Bridge = "Bridge"; bytes32 public constant GenericHandler = "GenericHandler"; bytes32 public constant SkinnyOptimisticOracle = "SkinnyOptimisticOracle"; }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; /** * @title Library for encoding and decoding ancillary data for DVM price requests. * @notice We assume that on-chain ancillary data can be formatted directly from bytes to utf8 encoding via * web3.utils.hexToUtf8, and that clients will parse the utf8-encoded ancillary data as a comma-delimitted key-value * dictionary. Therefore, this library provides internal methods that aid appending to ancillary data from Solidity * smart contracts. More details on UMA's ancillary data guidelines below: * https://docs.google.com/document/d/1zhKKjgY1BupBGPPrY_WOJvui0B6DMcd-xDR8-9-SPDw/edit */ library AncillaryData { // This converts the bottom half of a bytes32 input to hex in a highly gas-optimized way. // Source: the brilliant implementation at https://gitter.im/ethereum/solidity?at=5840d23416207f7b0ed08c9b. function toUtf8Bytes32Bottom(bytes32 bytesIn) private pure returns (bytes32) { unchecked { uint256 x = uint256(bytesIn); // Nibble interleave x = x & 0x00000000000000000000000000000000ffffffffffffffffffffffffffffffff; x = (x | (x * 2**64)) & 0x0000000000000000ffffffffffffffff0000000000000000ffffffffffffffff; x = (x | (x * 2**32)) & 0x00000000ffffffff00000000ffffffff00000000ffffffff00000000ffffffff; x = (x | (x * 2**16)) & 0x0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff; x = (x | (x * 2**8)) & 0x00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff; x = (x | (x * 2**4)) & 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f; // Hex encode uint256 h = (x & 0x0808080808080808080808080808080808080808080808080808080808080808) / 8; uint256 i = (x & 0x0404040404040404040404040404040404040404040404040404040404040404) / 4; uint256 j = (x & 0x0202020202020202020202020202020202020202020202020202020202020202) / 2; x = x + (h & (i | j)) * 0x27 + 0x3030303030303030303030303030303030303030303030303030303030303030; // Return the result. return bytes32(x); } } /** * @notice Returns utf8-encoded bytes32 string that can be read via web3.utils.hexToUtf8. * @dev Will return bytes32 in all lower case hex characters and without the leading 0x. * This has minor changes from the toUtf8BytesAddress to control for the size of the input. * @param bytesIn bytes32 to encode. * @return utf8 encoded bytes32. */ function toUtf8Bytes(bytes32 bytesIn) internal pure returns (bytes memory) { return abi.encodePacked(toUtf8Bytes32Bottom(bytesIn >> 128), toUtf8Bytes32Bottom(bytesIn)); } /** * @notice Returns utf8-encoded address that can be read via web3.utils.hexToUtf8. * Source: https://ethereum.stackexchange.com/questions/8346/convert-address-to-string/8447#8447 * @dev Will return address in all lower case characters and without the leading 0x. * @param x address to encode. * @return utf8 encoded address bytes. */ function toUtf8BytesAddress(address x) internal pure returns (bytes memory) { return abi.encodePacked(toUtf8Bytes32Bottom(bytes32(bytes20(x)) >> 128), bytes8(toUtf8Bytes32Bottom(bytes20(x)))); } /** * @notice Converts a uint into a base-10, UTF-8 representation stored in a `string` type. * @dev This method is based off of this code: https://stackoverflow.com/a/65707309. */ function toUtf8BytesUint(uint256 x) internal pure returns (bytes memory) { if (x == 0) { return "0"; } uint256 j = x; uint256 len; while (j != 0) { len++; j /= 10; } bytes memory bstr = new bytes(len); uint256 k = len; while (x != 0) { k = k - 1; uint8 temp = (48 + uint8(x - (x / 10) * 10)); bytes1 b1 = bytes1(temp); bstr[k] = b1; x /= 10; } return bstr; } function appendKeyValueBytes32( bytes memory currentAncillaryData, bytes memory key, bytes32 value ) internal pure returns (bytes memory) { bytes memory prefix = constructPrefix(currentAncillaryData, key); return abi.encodePacked(currentAncillaryData, prefix, toUtf8Bytes(value)); } /** * @notice Adds "key:value" to `currentAncillaryData` where `value` is an address that first needs to be converted * to utf8 bytes. For example, if `utf8(currentAncillaryData)="k1:v1"`, then this function will return * `utf8(k1:v1,key:value)`, and if `currentAncillaryData` is blank, then this will return `utf8(key:value)`. * @param currentAncillaryData This bytes data should ideally be able to be utf8-decoded, but its OK if not. * @param key Again, this bytes data should ideally be able to be utf8-decoded, but its OK if not. * @param value An address to set as the value in the key:value pair to append to `currentAncillaryData`. * @return Newly appended ancillary data. */ function appendKeyValueAddress( bytes memory currentAncillaryData, bytes memory key, address value ) internal pure returns (bytes memory) { bytes memory prefix = constructPrefix(currentAncillaryData, key); return abi.encodePacked(currentAncillaryData, prefix, toUtf8BytesAddress(value)); } /** * @notice Adds "key:value" to `currentAncillaryData` where `value` is a uint that first needs to be converted * to utf8 bytes. For example, if `utf8(currentAncillaryData)="k1:v1"`, then this function will return * `utf8(k1:v1,key:value)`, and if `currentAncillaryData` is blank, then this will return `utf8(key:value)`. * @param currentAncillaryData This bytes data should ideally be able to be utf8-decoded, but its OK if not. * @param key Again, this bytes data should ideally be able to be utf8-decoded, but its OK if not. * @param value A uint to set as the value in the key:value pair to append to `currentAncillaryData`. * @return Newly appended ancillary data. */ function appendKeyValueUint( bytes memory currentAncillaryData, bytes memory key, uint256 value ) internal pure returns (bytes memory) { bytes memory prefix = constructPrefix(currentAncillaryData, key); return abi.encodePacked(currentAncillaryData, prefix, toUtf8BytesUint(value)); } /** * @notice Helper method that returns the left hand side of a "key:value" pair plus the colon ":" and a leading * comma "," if the `currentAncillaryData` is not empty. The return value is intended to be prepended as a prefix to * some utf8 value that is ultimately added to a comma-delimited, key-value dictionary. */ function constructPrefix(bytes memory currentAncillaryData, bytes memory key) internal pure returns (bytes memory) { if (currentAncillaryData.length > 0) { return abi.encodePacked(",", key, ":"); } else { return abi.encodePacked(key, ":"); } } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; import "./Timer.sol"; /** * @title Base class that provides time overrides, but only if being run in test mode. */ abstract contract Testable { // If the contract is being run in production, then `timerAddress` will be the 0x0 address. // Note: this variable should be set on construction and never modified. address public timerAddress; /** * @notice Constructs the Testable contract. Called by child contracts. * @param _timerAddress Contract that stores the current time in a testing environment. * Must be set to 0x0 for production environments that use live time. */ constructor(address _timerAddress) { timerAddress = _timerAddress; } /** * @notice Reverts if not running in test mode. */ modifier onlyIfTest { require(timerAddress != address(0x0)); _; } /** * @notice Sets the current time. * @dev Will revert if not running in test mode. * @param time timestamp to set current Testable time to. */ function setCurrentTime(uint256 time) external onlyIfTest { Timer(timerAddress).setCurrentTime(time); } /** * @notice Gets the current time. Will return the last time set in `setCurrentTime` if running in test mode. * Otherwise, it will return the block timestamp. * @return uint for the current Testable timestamp. */ function getCurrentTime() public view virtual returns (uint256) { if (timerAddress != address(0x0)) { return Timer(timerAddress).getCurrentTime(); } else { return block.timestamp; // solhint-disable-line not-rely-on-time } } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; import "@openzeppelin/contracts/utils/math/SafeMath.sol"; import "@openzeppelin/contracts/utils/math/SignedSafeMath.sol"; /** * @title Library for fixed point arithmetic on uints */ library FixedPoint { using SafeMath for uint256; using SignedSafeMath for int256; // Supports 18 decimals. E.g., 1e18 represents "1", 5e17 represents "0.5". // For unsigned values: // This can represent a value up to (2^256 - 1)/10^18 = ~10^59. 10^59 will be stored internally as uint256 10^77. uint256 private constant FP_SCALING_FACTOR = 10**18; // --------------------------------------- UNSIGNED ----------------------------------------------------------------------------- struct Unsigned { uint256 rawValue; } /** * @notice Constructs an `Unsigned` from an unscaled uint, e.g., `b=5` gets stored internally as `5*(10**18)`. * @param a uint to convert into a FixedPoint. * @return the converted FixedPoint. */ function fromUnscaledUint(uint256 a) internal pure returns (Unsigned memory) { return Unsigned(a.mul(FP_SCALING_FACTOR)); } /** * @notice Whether `a` is equal to `b`. * @param a a FixedPoint. * @param b a uint256. * @return True if equal, or False. */ function isEqual(Unsigned memory a, uint256 b) internal pure returns (bool) { return a.rawValue == fromUnscaledUint(b).rawValue; } /** * @notice Whether `a` is equal to `b`. * @param a a FixedPoint. * @param b a FixedPoint. * @return True if equal, or False. */ function isEqual(Unsigned memory a, Unsigned memory b) internal pure returns (bool) { return a.rawValue == b.rawValue; } /** * @notice Whether `a` is greater than `b`. * @param a a FixedPoint. * @param b a FixedPoint. * @return True if `a > b`, or False. */ function isGreaterThan(Unsigned memory a, Unsigned memory b) internal pure returns (bool) { return a.rawValue > b.rawValue; } /** * @notice Whether `a` is greater than `b`. * @param a a FixedPoint. * @param b a uint256. * @return True if `a > b`, or False. */ function isGreaterThan(Unsigned memory a, uint256 b) internal pure returns (bool) { return a.rawValue > fromUnscaledUint(b).rawValue; } /** * @notice Whether `a` is greater than `b`. * @param a a uint256. * @param b a FixedPoint. * @return True if `a > b`, or False. */ function isGreaterThan(uint256 a, Unsigned memory b) internal pure returns (bool) { return fromUnscaledUint(a).rawValue > b.rawValue; } /** * @notice Whether `a` is greater than or equal to `b`. * @param a a FixedPoint. * @param b a FixedPoint. * @return True if `a >= b`, or False. */ function isGreaterThanOrEqual(Unsigned memory a, Unsigned memory b) internal pure returns (bool) { return a.rawValue >= b.rawValue; } /** * @notice Whether `a` is greater than or equal to `b`. * @param a a FixedPoint. * @param b a uint256. * @return True if `a >= b`, or False. */ function isGreaterThanOrEqual(Unsigned memory a, uint256 b) internal pure returns (bool) { return a.rawValue >= fromUnscaledUint(b).rawValue; } /** * @notice Whether `a` is greater than or equal to `b`. * @param a a uint256. * @param b a FixedPoint. * @return True if `a >= b`, or False. */ function isGreaterThanOrEqual(uint256 a, Unsigned memory b) internal pure returns (bool) { return fromUnscaledUint(a).rawValue >= b.rawValue; } /** * @notice Whether `a` is less than `b`. * @param a a FixedPoint. * @param b a FixedPoint. * @return True if `a < b`, or False. */ function isLessThan(Unsigned memory a, Unsigned memory b) internal pure returns (bool) { return a.rawValue < b.rawValue; } /** * @notice Whether `a` is less than `b`. * @param a a FixedPoint. * @param b a uint256. * @return True if `a < b`, or False. */ function isLessThan(Unsigned memory a, uint256 b) internal pure returns (bool) { return a.rawValue < fromUnscaledUint(b).rawValue; } /** * @notice Whether `a` is less than `b`. * @param a a uint256. * @param b a FixedPoint. * @return True if `a < b`, or False. */ function isLessThan(uint256 a, Unsigned memory b) internal pure returns (bool) { return fromUnscaledUint(a).rawValue < b.rawValue; } /** * @notice Whether `a` is less than or equal to `b`. * @param a a FixedPoint. * @param b a FixedPoint. * @return True if `a <= b`, or False. */ function isLessThanOrEqual(Unsigned memory a, Unsigned memory b) internal pure returns (bool) { return a.rawValue <= b.rawValue; } /** * @notice Whether `a` is less than or equal to `b`. * @param a a FixedPoint. * @param b a uint256. * @return True if `a <= b`, or False. */ function isLessThanOrEqual(Unsigned memory a, uint256 b) internal pure returns (bool) { return a.rawValue <= fromUnscaledUint(b).rawValue; } /** * @notice Whether `a` is less than or equal to `b`. * @param a a uint256. * @param b a FixedPoint. * @return True if `a <= b`, or False. */ function isLessThanOrEqual(uint256 a, Unsigned memory b) internal pure returns (bool) { return fromUnscaledUint(a).rawValue <= b.rawValue; } /** * @notice The minimum of `a` and `b`. * @param a a FixedPoint. * @param b a FixedPoint. * @return the minimum of `a` and `b`. */ function min(Unsigned memory a, Unsigned memory b) internal pure returns (Unsigned memory) { return a.rawValue < b.rawValue ? a : b; } /** * @notice The maximum of `a` and `b`. * @param a a FixedPoint. * @param b a FixedPoint. * @return the maximum of `a` and `b`. */ function max(Unsigned memory a, Unsigned memory b) internal pure returns (Unsigned memory) { return a.rawValue > b.rawValue ? a : b; } /** * @notice Adds two `Unsigned`s, reverting on overflow. * @param a a FixedPoint. * @param b a FixedPoint. * @return the sum of `a` and `b`. */ function add(Unsigned memory a, Unsigned memory b) internal pure returns (Unsigned memory) { return Unsigned(a.rawValue.add(b.rawValue)); } /** * @notice Adds an `Unsigned` to an unscaled uint, reverting on overflow. * @param a a FixedPoint. * @param b a uint256. * @return the sum of `a` and `b`. */ function add(Unsigned memory a, uint256 b) internal pure returns (Unsigned memory) { return add(a, fromUnscaledUint(b)); } /** * @notice Subtracts two `Unsigned`s, reverting on overflow. * @param a a FixedPoint. * @param b a FixedPoint. * @return the difference of `a` and `b`. */ function sub(Unsigned memory a, Unsigned memory b) internal pure returns (Unsigned memory) { return Unsigned(a.rawValue.sub(b.rawValue)); } /** * @notice Subtracts an unscaled uint256 from an `Unsigned`, reverting on overflow. * @param a a FixedPoint. * @param b a uint256. * @return the difference of `a` and `b`. */ function sub(Unsigned memory a, uint256 b) internal pure returns (Unsigned memory) { return sub(a, fromUnscaledUint(b)); } /** * @notice Subtracts an `Unsigned` from an unscaled uint256, reverting on overflow. * @param a a uint256. * @param b a FixedPoint. * @return the difference of `a` and `b`. */ function sub(uint256 a, Unsigned memory b) internal pure returns (Unsigned memory) { return sub(fromUnscaledUint(a), b); } /** * @notice Multiplies two `Unsigned`s, reverting on overflow. * @dev This will "floor" the product. * @param a a FixedPoint. * @param b a FixedPoint. * @return the product of `a` and `b`. */ function mul(Unsigned memory a, Unsigned memory b) internal pure returns (Unsigned memory) { // There are two caveats with this computation: // 1. Max output for the represented number is ~10^41, otherwise an intermediate value overflows. 10^41 is // stored internally as a uint256 ~10^59. // 2. Results that can't be represented exactly are truncated not rounded. E.g., 1.4 * 2e-18 = 2.8e-18, which // would round to 3, but this computation produces the result 2. // No need to use SafeMath because FP_SCALING_FACTOR != 0. return Unsigned(a.rawValue.mul(b.rawValue) / FP_SCALING_FACTOR); } /** * @notice Multiplies an `Unsigned` and an unscaled uint256, reverting on overflow. * @dev This will "floor" the product. * @param a a FixedPoint. * @param b a uint256. * @return the product of `a` and `b`. */ function mul(Unsigned memory a, uint256 b) internal pure returns (Unsigned memory) { return Unsigned(a.rawValue.mul(b)); } /** * @notice Multiplies two `Unsigned`s and "ceil's" the product, reverting on overflow. * @param a a FixedPoint. * @param b a FixedPoint. * @return the product of `a` and `b`. */ function mulCeil(Unsigned memory a, Unsigned memory b) internal pure returns (Unsigned memory) { uint256 mulRaw = a.rawValue.mul(b.rawValue); uint256 mulFloor = mulRaw / FP_SCALING_FACTOR; uint256 mod = mulRaw.mod(FP_SCALING_FACTOR); if (mod != 0) { return Unsigned(mulFloor.add(1)); } else { return Unsigned(mulFloor); } } /** * @notice Multiplies an `Unsigned` and an unscaled uint256 and "ceil's" the product, reverting on overflow. * @param a a FixedPoint. * @param b a FixedPoint. * @return the product of `a` and `b`. */ function mulCeil(Unsigned memory a, uint256 b) internal pure returns (Unsigned memory) { // Since b is an uint, there is no risk of truncation and we can just mul it normally return Unsigned(a.rawValue.mul(b)); } /** * @notice Divides one `Unsigned` by an `Unsigned`, reverting on overflow or division by 0. * @dev This will "floor" the quotient. * @param a a FixedPoint numerator. * @param b a FixedPoint denominator. * @return the quotient of `a` divided by `b`. */ function div(Unsigned memory a, Unsigned memory b) internal pure returns (Unsigned memory) { // There are two caveats with this computation: // 1. Max value for the number dividend `a` represents is ~10^41, otherwise an intermediate value overflows. // 10^41 is stored internally as a uint256 10^59. // 2. Results that can't be represented exactly are truncated not rounded. E.g., 2 / 3 = 0.6 repeating, which // would round to 0.666666666666666667, but this computation produces the result 0.666666666666666666. return Unsigned(a.rawValue.mul(FP_SCALING_FACTOR).div(b.rawValue)); } /** * @notice Divides one `Unsigned` by an unscaled uint256, reverting on overflow or division by 0. * @dev This will "floor" the quotient. * @param a a FixedPoint numerator. * @param b a uint256 denominator. * @return the quotient of `a` divided by `b`. */ function div(Unsigned memory a, uint256 b) internal pure returns (Unsigned memory) { return Unsigned(a.rawValue.div(b)); } /** * @notice Divides one unscaled uint256 by an `Unsigned`, reverting on overflow or division by 0. * @dev This will "floor" the quotient. * @param a a uint256 numerator. * @param b a FixedPoint denominator. * @return the quotient of `a` divided by `b`. */ function div(uint256 a, Unsigned memory b) internal pure returns (Unsigned memory) { return div(fromUnscaledUint(a), b); } /** * @notice Divides one `Unsigned` by an `Unsigned` and "ceil's" the quotient, reverting on overflow or division by 0. * @param a a FixedPoint numerator. * @param b a FixedPoint denominator. * @return the quotient of `a` divided by `b`. */ function divCeil(Unsigned memory a, Unsigned memory b) internal pure returns (Unsigned memory) { uint256 aScaled = a.rawValue.mul(FP_SCALING_FACTOR); uint256 divFloor = aScaled.div(b.rawValue); uint256 mod = aScaled.mod(b.rawValue); if (mod != 0) { return Unsigned(divFloor.add(1)); } else { return Unsigned(divFloor); } } /** * @notice Divides one `Unsigned` by an unscaled uint256 and "ceil's" the quotient, reverting on overflow or division by 0. * @param a a FixedPoint numerator. * @param b a uint256 denominator. * @return the quotient of `a` divided by `b`. */ function divCeil(Unsigned memory a, uint256 b) internal pure returns (Unsigned memory) { // Because it is possible that a quotient gets truncated, we can't just call "Unsigned(a.rawValue.div(b))" // similarly to mulCeil with a uint256 as the second parameter. Therefore we need to convert b into an Unsigned. // This creates the possibility of overflow if b is very large. return divCeil(a, fromUnscaledUint(b)); } /** * @notice Raises an `Unsigned` to the power of an unscaled uint256, reverting on overflow. E.g., `b=2` squares `a`. * @dev This will "floor" the result. * @param a a FixedPoint numerator. * @param b a uint256 denominator. * @return output is `a` to the power of `b`. */ function pow(Unsigned memory a, uint256 b) internal pure returns (Unsigned memory output) { output = fromUnscaledUint(1); for (uint256 i = 0; i < b; i = i.add(1)) { output = mul(output, a); } } // ------------------------------------------------- SIGNED ------------------------------------------------------------- // Supports 18 decimals. E.g., 1e18 represents "1", 5e17 represents "0.5". // For signed values: // This can represent a value up (or down) to +-(2^255 - 1)/10^18 = ~10^58. 10^58 will be stored internally as int256 10^76. int256 private constant SFP_SCALING_FACTOR = 10**18; struct Signed { int256 rawValue; } function fromSigned(Signed memory a) internal pure returns (Unsigned memory) { require(a.rawValue >= 0, "Negative value provided"); return Unsigned(uint256(a.rawValue)); } function fromUnsigned(Unsigned memory a) internal pure returns (Signed memory) { require(a.rawValue <= uint256(type(int256).max), "Unsigned too large"); return Signed(int256(a.rawValue)); } /** * @notice Constructs a `Signed` from an unscaled int, e.g., `b=5` gets stored internally as `5*(10**18)`. * @param a int to convert into a FixedPoint.Signed. * @return the converted FixedPoint.Signed. */ function fromUnscaledInt(int256 a) internal pure returns (Signed memory) { return Signed(a.mul(SFP_SCALING_FACTOR)); } /** * @notice Whether `a` is equal to `b`. * @param a a FixedPoint.Signed. * @param b a int256. * @return True if equal, or False. */ function isEqual(Signed memory a, int256 b) internal pure returns (bool) { return a.rawValue == fromUnscaledInt(b).rawValue; } /** * @notice Whether `a` is equal to `b`. * @param a a FixedPoint.Signed. * @param b a FixedPoint.Signed. * @return True if equal, or False. */ function isEqual(Signed memory a, Signed memory b) internal pure returns (bool) { return a.rawValue == b.rawValue; } /** * @notice Whether `a` is greater than `b`. * @param a a FixedPoint.Signed. * @param b a FixedPoint.Signed. * @return True if `a > b`, or False. */ function isGreaterThan(Signed memory a, Signed memory b) internal pure returns (bool) { return a.rawValue > b.rawValue; } /** * @notice Whether `a` is greater than `b`. * @param a a FixedPoint.Signed. * @param b an int256. * @return True if `a > b`, or False. */ function isGreaterThan(Signed memory a, int256 b) internal pure returns (bool) { return a.rawValue > fromUnscaledInt(b).rawValue; } /** * @notice Whether `a` is greater than `b`. * @param a an int256. * @param b a FixedPoint.Signed. * @return True if `a > b`, or False. */ function isGreaterThan(int256 a, Signed memory b) internal pure returns (bool) { return fromUnscaledInt(a).rawValue > b.rawValue; } /** * @notice Whether `a` is greater than or equal to `b`. * @param a a FixedPoint.Signed. * @param b a FixedPoint.Signed. * @return True if `a >= b`, or False. */ function isGreaterThanOrEqual(Signed memory a, Signed memory b) internal pure returns (bool) { return a.rawValue >= b.rawValue; } /** * @notice Whether `a` is greater than or equal to `b`. * @param a a FixedPoint.Signed. * @param b an int256. * @return True if `a >= b`, or False. */ function isGreaterThanOrEqual(Signed memory a, int256 b) internal pure returns (bool) { return a.rawValue >= fromUnscaledInt(b).rawValue; } /** * @notice Whether `a` is greater than or equal to `b`. * @param a an int256. * @param b a FixedPoint.Signed. * @return True if `a >= b`, or False. */ function isGreaterThanOrEqual(int256 a, Signed memory b) internal pure returns (bool) { return fromUnscaledInt(a).rawValue >= b.rawValue; } /** * @notice Whether `a` is less than `b`. * @param a a FixedPoint.Signed. * @param b a FixedPoint.Signed. * @return True if `a < b`, or False. */ function isLessThan(Signed memory a, Signed memory b) internal pure returns (bool) { return a.rawValue < b.rawValue; } /** * @notice Whether `a` is less than `b`. * @param a a FixedPoint.Signed. * @param b an int256. * @return True if `a < b`, or False. */ function isLessThan(Signed memory a, int256 b) internal pure returns (bool) { return a.rawValue < fromUnscaledInt(b).rawValue; } /** * @notice Whether `a` is less than `b`. * @param a an int256. * @param b a FixedPoint.Signed. * @return True if `a < b`, or False. */ function isLessThan(int256 a, Signed memory b) internal pure returns (bool) { return fromUnscaledInt(a).rawValue < b.rawValue; } /** * @notice Whether `a` is less than or equal to `b`. * @param a a FixedPoint.Signed. * @param b a FixedPoint.Signed. * @return True if `a <= b`, or False. */ function isLessThanOrEqual(Signed memory a, Signed memory b) internal pure returns (bool) { return a.rawValue <= b.rawValue; } /** * @notice Whether `a` is less than or equal to `b`. * @param a a FixedPoint.Signed. * @param b an int256. * @return True if `a <= b`, or False. */ function isLessThanOrEqual(Signed memory a, int256 b) internal pure returns (bool) { return a.rawValue <= fromUnscaledInt(b).rawValue; } /** * @notice Whether `a` is less than or equal to `b`. * @param a an int256. * @param b a FixedPoint.Signed. * @return True if `a <= b`, or False. */ function isLessThanOrEqual(int256 a, Signed memory b) internal pure returns (bool) { return fromUnscaledInt(a).rawValue <= b.rawValue; } /** * @notice The minimum of `a` and `b`. * @param a a FixedPoint.Signed. * @param b a FixedPoint.Signed. * @return the minimum of `a` and `b`. */ function min(Signed memory a, Signed memory b) internal pure returns (Signed memory) { return a.rawValue < b.rawValue ? a : b; } /** * @notice The maximum of `a` and `b`. * @param a a FixedPoint.Signed. * @param b a FixedPoint.Signed. * @return the maximum of `a` and `b`. */ function max(Signed memory a, Signed memory b) internal pure returns (Signed memory) { return a.rawValue > b.rawValue ? a : b; } /** * @notice Adds two `Signed`s, reverting on overflow. * @param a a FixedPoint.Signed. * @param b a FixedPoint.Signed. * @return the sum of `a` and `b`. */ function add(Signed memory a, Signed memory b) internal pure returns (Signed memory) { return Signed(a.rawValue.add(b.rawValue)); } /** * @notice Adds an `Signed` to an unscaled int, reverting on overflow. * @param a a FixedPoint.Signed. * @param b an int256. * @return the sum of `a` and `b`. */ function add(Signed memory a, int256 b) internal pure returns (Signed memory) { return add(a, fromUnscaledInt(b)); } /** * @notice Subtracts two `Signed`s, reverting on overflow. * @param a a FixedPoint.Signed. * @param b a FixedPoint.Signed. * @return the difference of `a` and `b`. */ function sub(Signed memory a, Signed memory b) internal pure returns (Signed memory) { return Signed(a.rawValue.sub(b.rawValue)); } /** * @notice Subtracts an unscaled int256 from an `Signed`, reverting on overflow. * @param a a FixedPoint.Signed. * @param b an int256. * @return the difference of `a` and `b`. */ function sub(Signed memory a, int256 b) internal pure returns (Signed memory) { return sub(a, fromUnscaledInt(b)); } /** * @notice Subtracts an `Signed` from an unscaled int256, reverting on overflow. * @param a an int256. * @param b a FixedPoint.Signed. * @return the difference of `a` and `b`. */ function sub(int256 a, Signed memory b) internal pure returns (Signed memory) { return sub(fromUnscaledInt(a), b); } /** * @notice Multiplies two `Signed`s, reverting on overflow. * @dev This will "floor" the product. * @param a a FixedPoint.Signed. * @param b a FixedPoint.Signed. * @return the product of `a` and `b`. */ function mul(Signed memory a, Signed memory b) internal pure returns (Signed memory) { // There are two caveats with this computation: // 1. Max output for the represented number is ~10^41, otherwise an intermediate value overflows. 10^41 is // stored internally as an int256 ~10^59. // 2. Results that can't be represented exactly are truncated not rounded. E.g., 1.4 * 2e-18 = 2.8e-18, which // would round to 3, but this computation produces the result 2. // No need to use SafeMath because SFP_SCALING_FACTOR != 0. return Signed(a.rawValue.mul(b.rawValue) / SFP_SCALING_FACTOR); } /** * @notice Multiplies an `Signed` and an unscaled int256, reverting on overflow. * @dev This will "floor" the product. * @param a a FixedPoint.Signed. * @param b an int256. * @return the product of `a` and `b`. */ function mul(Signed memory a, int256 b) internal pure returns (Signed memory) { return Signed(a.rawValue.mul(b)); } /** * @notice Multiplies two `Signed`s and "ceil's" the product, reverting on overflow. * @param a a FixedPoint.Signed. * @param b a FixedPoint.Signed. * @return the product of `a` and `b`. */ function mulAwayFromZero(Signed memory a, Signed memory b) internal pure returns (Signed memory) { int256 mulRaw = a.rawValue.mul(b.rawValue); int256 mulTowardsZero = mulRaw / SFP_SCALING_FACTOR; // Manual mod because SignedSafeMath doesn't support it. int256 mod = mulRaw % SFP_SCALING_FACTOR; if (mod != 0) { bool isResultPositive = isLessThan(a, 0) == isLessThan(b, 0); int256 valueToAdd = isResultPositive ? int256(1) : int256(-1); return Signed(mulTowardsZero.add(valueToAdd)); } else { return Signed(mulTowardsZero); } } /** * @notice Multiplies an `Signed` and an unscaled int256 and "ceil's" the product, reverting on overflow. * @param a a FixedPoint.Signed. * @param b a FixedPoint.Signed. * @return the product of `a` and `b`. */ function mulAwayFromZero(Signed memory a, int256 b) internal pure returns (Signed memory) { // Since b is an int, there is no risk of truncation and we can just mul it normally return Signed(a.rawValue.mul(b)); } /** * @notice Divides one `Signed` by an `Signed`, reverting on overflow or division by 0. * @dev This will "floor" the quotient. * @param a a FixedPoint numerator. * @param b a FixedPoint denominator. * @return the quotient of `a` divided by `b`. */ function div(Signed memory a, Signed memory b) internal pure returns (Signed memory) { // There are two caveats with this computation: // 1. Max value for the number dividend `a` represents is ~10^41, otherwise an intermediate value overflows. // 10^41 is stored internally as an int256 10^59. // 2. Results that can't be represented exactly are truncated not rounded. E.g., 2 / 3 = 0.6 repeating, which // would round to 0.666666666666666667, but this computation produces the result 0.666666666666666666. return Signed(a.rawValue.mul(SFP_SCALING_FACTOR).div(b.rawValue)); } /** * @notice Divides one `Signed` by an unscaled int256, reverting on overflow or division by 0. * @dev This will "floor" the quotient. * @param a a FixedPoint numerator. * @param b an int256 denominator. * @return the quotient of `a` divided by `b`. */ function div(Signed memory a, int256 b) internal pure returns (Signed memory) { return Signed(a.rawValue.div(b)); } /** * @notice Divides one unscaled int256 by an `Signed`, reverting on overflow or division by 0. * @dev This will "floor" the quotient. * @param a an int256 numerator. * @param b a FixedPoint denominator. * @return the quotient of `a` divided by `b`. */ function div(int256 a, Signed memory b) internal pure returns (Signed memory) { return div(fromUnscaledInt(a), b); } /** * @notice Divides one `Signed` by an `Signed` and "ceil's" the quotient, reverting on overflow or division by 0. * @param a a FixedPoint numerator. * @param b a FixedPoint denominator. * @return the quotient of `a` divided by `b`. */ function divAwayFromZero(Signed memory a, Signed memory b) internal pure returns (Signed memory) { int256 aScaled = a.rawValue.mul(SFP_SCALING_FACTOR); int256 divTowardsZero = aScaled.div(b.rawValue); // Manual mod because SignedSafeMath doesn't support it. int256 mod = aScaled % b.rawValue; if (mod != 0) { bool isResultPositive = isLessThan(a, 0) == isLessThan(b, 0); int256 valueToAdd = isResultPositive ? int256(1) : int256(-1); return Signed(divTowardsZero.add(valueToAdd)); } else { return Signed(divTowardsZero); } } /** * @notice Divides one `Signed` by an unscaled int256 and "ceil's" the quotient, reverting on overflow or division by 0. * @param a a FixedPoint numerator. * @param b an int256 denominator. * @return the quotient of `a` divided by `b`. */ function divAwayFromZero(Signed memory a, int256 b) internal pure returns (Signed memory) { // Because it is possible that a quotient gets truncated, we can't just call "Signed(a.rawValue.div(b))" // similarly to mulCeil with an int256 as the second parameter. Therefore we need to convert b into an Signed. // This creates the possibility of overflow if b is very large. return divAwayFromZero(a, fromUnscaledInt(b)); } /** * @notice Raises an `Signed` to the power of an unscaled uint256, reverting on overflow. E.g., `b=2` squares `a`. * @dev This will "floor" the result. * @param a a FixedPoint.Signed. * @param b a uint256 (negative exponents are not allowed). * @return output is `a` to the power of `b`. */ function pow(Signed memory a, uint256 b) internal pure returns (Signed memory output) { output = fromUnscaledInt(1); for (uint256 i = 0; i < b; i = i.add(1)) { output = mul(output, a); } } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; /** * @title A contract that provides modifiers to prevent reentrancy to state-changing and view-only methods. This contract * is inspired by https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/ReentrancyGuard.sol * and https://github.com/balancer-labs/balancer-core/blob/master/contracts/BPool.sol. */ contract Lockable { bool private _notEntered; constructor() { // Storing an initial non-zero value makes deployment a bit more expensive, but in exchange the refund on every // call to nonReentrant will be lower in amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to increase the likelihood of the full // refund coming into effect. _notEntered = true; } /** * @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 making it call a `private` * function that does the actual state modification. */ modifier nonReentrant() { _preEntranceCheck(); _preEntranceSet(); _; _postEntranceReset(); } /** * @dev Designed to prevent a view-only method from being re-entered during a call to a `nonReentrant()` state-changing method. */ modifier nonReentrantView() { _preEntranceCheck(); _; } // Internal methods are used to avoid copying the require statement's bytecode to every `nonReentrant()` method. // On entry into a function, `_preEntranceCheck()` should always be called to check if the function is being // re-entered. Then, if the function modifies state, it should call `_postEntranceSet()`, perform its logic, and // then call `_postEntranceReset()`. // View-only methods can simply call `_preEntranceCheck()` to make sure that it is not being re-entered. function _preEntranceCheck() internal view { // On the first call to nonReentrant, _notEntered will be true require(_notEntered, "ReentrancyGuard: reentrant call"); } function _preEntranceSet() internal { // Any calls to nonReentrant after this point will fail _notEntered = false; } function _postEntranceReset() internal { // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _notEntered = true; } }
// This contract is taken from Uniswaps's multi call implementation (https://github.com/Uniswap/uniswap-v3-periphery/blob/main/contracts/base/Multicall.sol) // and was modified to be solidity 0.8 compatible. Additionally, the method was restricted to only work with msg.value // set to 0 to avoid any nasty attack vectors on function calls that use value sent with deposits. pragma solidity ^0.8.0; /// @title MultiCaller /// @notice Enables calling multiple methods in a single call to the contract contract MultiCaller { function multicall(bytes[] calldata data) external payable returns (bytes[] memory results) { require(msg.value == 0, "Only multicall with 0 value"); results = new bytes[](data.length); for (uint256 i = 0; i < data.length; i++) { (bool success, bytes memory result) = address(this).delegatecall(data[i]); if (!success) { // Next 5 lines from https://ethereum.stackexchange.com/a/83577 if (result.length < 68) revert(); assembly { result := add(result, 0x04) } revert(abi.decode(result, (string))); } results[i] = result; } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ 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); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The defaut value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor (string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { _transfer(sender, recipient, amount); uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); _approve(sender, _msgSender(), currentAllowance - amount); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); _approve(_msgSender(), spender, currentAllowance - subtractedValue); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); _balances[sender] = senderBalance - amount; _balances[recipient] += amount; emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); _balances[account] = accountBalance - amount; _totalSupply -= amount; emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC20.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' // solhint-disable-next-line max-line-length require((value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; /** * @title Financial contract facing Oracle interface. * @dev Interface used by financial contracts to interact with the Oracle. Voters will use a different interface. */ abstract contract OptimisticOracleInterface { // Struct representing the state of a price request. enum State { Invalid, // Never requested. Requested, // Requested, no other actions taken. Proposed, // Proposed, but not expired or disputed yet. Expired, // Proposed, not disputed, past liveness. Disputed, // Disputed, but no DVM price returned yet. Resolved, // Disputed and DVM price is available. Settled // Final price has been set in the contract (can get here from Expired or Resolved). } // Struct representing a price request. struct Request { address proposer; // Address of the proposer. address disputer; // Address of the disputer. IERC20 currency; // ERC20 token used to pay rewards and fees. bool settled; // True if the request is settled. bool refundOnDispute; // True if the requester should be refunded their reward on dispute. int256 proposedPrice; // Price that the proposer submitted. int256 resolvedPrice; // Price resolved once the request is settled. uint256 expirationTime; // Time at which the request auto-settles without a dispute. uint256 reward; // Amount of the currency to pay to the proposer on settlement. uint256 finalFee; // Final fee to pay to the Store upon request to the DVM. uint256 bond; // Bond that the proposer and disputer must pay on top of the final fee. uint256 customLiveness; // Custom liveness value set by the requester. } // This value must be <= the Voting contract's `ancillaryBytesLimit` value otherwise it is possible // that a price can be requested to this contract successfully, but cannot be disputed because the DVM refuses // to accept a price request made with ancillary data length over a certain size. uint256 public constant ancillaryBytesLimit = 8192; /** * @notice Requests a new price. * @param identifier price identifier being requested. * @param timestamp timestamp of the price being requested. * @param ancillaryData ancillary data representing additional args being passed with the price request. * @param currency ERC20 token used for payment of rewards and fees. Must be approved for use with the DVM. * @param reward reward offered to a successful proposer. Will be pulled from the caller. Note: this can be 0, * which could make sense if the contract requests and proposes the value in the same call or * provides its own reward system. * @return totalBond default bond (final fee) + final fee that the proposer and disputer will be required to pay. * This can be changed with a subsequent call to setBond(). */ function requestPrice( bytes32 identifier, uint256 timestamp, bytes memory ancillaryData, IERC20 currency, uint256 reward ) external virtual returns (uint256 totalBond); /** * @notice Set the proposal bond associated with a price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @param bond custom bond amount to set. * @return totalBond new bond + final fee that the proposer and disputer will be required to pay. This can be * changed again with a subsequent call to setBond(). */ function setBond( bytes32 identifier, uint256 timestamp, bytes memory ancillaryData, uint256 bond ) external virtual returns (uint256 totalBond); /** * @notice Sets the request to refund the reward if the proposal is disputed. This can help to "hedge" the caller * in the event of a dispute-caused delay. Note: in the event of a dispute, the winner still receives the other's * bond, so there is still profit to be made even if the reward is refunded. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. */ function setRefundOnDispute( bytes32 identifier, uint256 timestamp, bytes memory ancillaryData ) external virtual; /** * @notice Sets a custom liveness value for the request. Liveness is the amount of time a proposal must wait before * being auto-resolved. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @param customLiveness new custom liveness. */ function setCustomLiveness( bytes32 identifier, uint256 timestamp, bytes memory ancillaryData, uint256 customLiveness ) external virtual; /** * @notice Proposes a price value on another address' behalf. Note: this address will receive any rewards that come * from this proposal. However, any bonds are pulled from the caller. * @param proposer address to set as the proposer. * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @param proposedPrice price being proposed. * @return totalBond the amount that's pulled from the caller's wallet as a bond. The bond will be returned to * the proposer once settled if the proposal is correct. */ function proposePriceFor( address proposer, address requester, bytes32 identifier, uint256 timestamp, bytes memory ancillaryData, int256 proposedPrice ) public virtual returns (uint256 totalBond); /** * @notice Proposes a price value for an existing price request. * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @param proposedPrice price being proposed. * @return totalBond the amount that's pulled from the proposer's wallet as a bond. The bond will be returned to * the proposer once settled if the proposal is correct. */ function proposePrice( address requester, bytes32 identifier, uint256 timestamp, bytes memory ancillaryData, int256 proposedPrice ) external virtual returns (uint256 totalBond); /** * @notice Disputes a price request with an active proposal on another address' behalf. Note: this address will * receive any rewards that come from this dispute. However, any bonds are pulled from the caller. * @param disputer address to set as the disputer. * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @return totalBond the amount that's pulled from the caller's wallet as a bond. The bond will be returned to * the disputer once settled if the dispute was value (the proposal was incorrect). */ function disputePriceFor( address disputer, address requester, bytes32 identifier, uint256 timestamp, bytes memory ancillaryData ) public virtual returns (uint256 totalBond); /** * @notice Disputes a price value for an existing price request with an active proposal. * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @return totalBond the amount that's pulled from the disputer's wallet as a bond. The bond will be returned to * the disputer once settled if the dispute was valid (the proposal was incorrect). */ function disputePrice( address requester, bytes32 identifier, uint256 timestamp, bytes memory ancillaryData ) external virtual returns (uint256 totalBond); /** * @notice Retrieves a price that was previously requested by a caller. Reverts if the request is not settled * or settleable. Note: this method is not view so that this call may actually settle the price request if it * hasn't been settled. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @return resolved price. */ function settleAndGetPrice( bytes32 identifier, uint256 timestamp, bytes memory ancillaryData ) external virtual returns (int256); /** * @notice Attempts to settle an outstanding price request. Will revert if it isn't settleable. * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @return payout the amount that the "winner" (proposer or disputer) receives on settlement. This amount includes * the returned bonds as well as additional rewards. */ function settle( address requester, bytes32 identifier, uint256 timestamp, bytes memory ancillaryData ) external virtual returns (uint256 payout); /** * @notice Gets the current data structure containing all information about a price request. * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @return the Request data structure. */ function getRequest( address requester, bytes32 identifier, uint256 timestamp, bytes memory ancillaryData ) public view virtual returns (Request memory); /** * @notice Returns the state of a price request. * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @return the State enum value. */ function getState( address requester, bytes32 identifier, uint256 timestamp, bytes memory ancillaryData ) public view virtual returns (State); /** * @notice Checks if a given request has resolved or been settled (i.e the optimistic oracle has a price). * @param requester sender of the initial price request. * @param identifier price identifier to identify the existing request. * @param timestamp timestamp to identify the existing request. * @param ancillaryData ancillary data of the price being requested. * @return true if price has resolved or settled, false otherwise. */ function hasPrice( address requester, bytes32 identifier, uint256 timestamp, bytes memory ancillaryData ) public view virtual returns (bool); function stampAncillaryData(bytes memory ancillaryData, address requester) public view virtual returns (bytes memory); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; // CAUTION // This version of SafeMath should only be used with Solidity 0.8 or later, // because it relies on the compiler's built in overflow checks. /** * @dev Wrappers over Solidity's arithmetic operations. * * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler * now has built in overflow checking. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b > a) return (false, 0); return (true, a - b); } } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { // 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 (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a / b); } } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a % b); } } /** * @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) { return a + b; } /** * @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 a - b; } /** * @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) { return a * b; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting 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 a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { unchecked { require(b <= a, errorMessage); return a - b; } } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards 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). * * 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, string memory errorMessage) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a / b; } } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * 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, string memory errorMessage) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a % b; } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Wrappers over Solidity's arithmetic operations. * * NOTE: `SignedSafeMath` is no longer needed starting with Solidity 0.8. The compiler * now has built in overflow checking. */ library SignedSafeMath { /** * @dev Returns the multiplication of two signed integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(int256 a, int256 b) internal pure returns (int256) { return a * b; } /** * @dev Returns the integer division of two signed integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. * * Requirements: * * - The divisor cannot be zero. */ function div(int256 a, int256 b) internal pure returns (int256) { return a / b; } /** * @dev Returns the subtraction of two signed integers, reverting on * overflow. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(int256 a, int256 b) internal pure returns (int256) { return a - b; } /** * @dev Returns the addition of two signed integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(int256 a, int256 b) internal pure returns (int256) { return a + b; } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity ^0.8.0; /** * @title Universal store of current contract time for testing environments. */ contract Timer { uint256 private currentTime; constructor() { currentTime = block.timestamp; // solhint-disable-line not-rely-on-time } /** * @notice Sets the current time. * @dev Will revert if not running in test mode. * @param time timestamp to set `currentTime` to. */ function setCurrentTime(uint256 time) external { currentTime = time; } /** * @notice Gets the currentTime variable set in the Timer. * @return uint256 for the current Testable timestamp. */ function getCurrentTime() public view returns (uint256) { return currentTime; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /* * @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 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. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : _lpTokenName (string): Across WETH LP
Arg [1] : _lpTokenSymbol (string): A-WETH-LP
Arg [2] : _bridgeAdmin (address): 0x30B44C676A05F1264d1dE9cC31dB5F2A945186b6
Arg [3] : _l1Token (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2
Arg [4] : _lpFeeRatePerSecond (uint64): 1500000000000
Arg [5] : _isWethPool (bool): True
Arg [6] : _timer (address): 0x0000000000000000000000000000000000000000
-----Encoded View---------------
11 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000000e0
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000120
Arg [2] : 00000000000000000000000030b44c676a05f1264d1de9cc31db5f2a945186b6
Arg [3] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [4] : 0000000000000000000000000000000000000000000000000000015d3ef79800
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [7] : 000000000000000000000000000000000000000000000000000000000000000e
Arg [8] : 4163726f73732057455448204c50000000000000000000000000000000000000
Arg [9] : 0000000000000000000000000000000000000000000000000000000000000009
Arg [10] : 412d574554482d4c500000000000000000000000000000000000000000000000
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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.