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Contract Name:
AccessControlledOffchainAggregator
Compiler Version
v0.7.6+commit.7338295f
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.7.6; import "./OffchainAggregator.sol"; import "./SimpleReadAccessController.sol"; /** * @notice Wrapper of OffchainAggregator which checks read access on Aggregator-interface methods */ contract AccessControlledOffchainAggregator is OffchainAggregator, SimpleReadAccessController { constructor( uint32 _maximumGasPrice, uint32 _reasonableGasPrice, uint32 _microLinkPerEth, uint32 _linkGweiPerObservation, uint32 _linkGweiPerTransmission, LinkTokenInterface _link, int192 _minAnswer, int192 _maxAnswer, AccessControllerInterface _billingAccessController, AccessControllerInterface _requesterAccessController, uint8 _decimals, string memory description ) OffchainAggregator( _maximumGasPrice, _reasonableGasPrice, _microLinkPerEth, _linkGweiPerObservation, _linkGweiPerTransmission, _link, _minAnswer, _maxAnswer, _billingAccessController, _requesterAccessController, _decimals, description ) { } /* * Versioning */ function typeAndVersion() external override pure virtual returns (string memory) { return "AccessControlledOffchainAggregator 4.0.0"; } /* * v2 Aggregator interface */ /// @inheritdoc OffchainAggregator function latestAnswer() public override view checkAccess() returns (int256) { return super.latestAnswer(); } /// @inheritdoc OffchainAggregator function latestTimestamp() public override view checkAccess() returns (uint256) { return super.latestTimestamp(); } /// @inheritdoc OffchainAggregator function latestRound() public override view checkAccess() returns (uint256) { return super.latestRound(); } /// @inheritdoc OffchainAggregator function getAnswer(uint256 _roundId) public override view checkAccess() returns (int256) { return super.getAnswer(_roundId); } /// @inheritdoc OffchainAggregator function getTimestamp(uint256 _roundId) public override view checkAccess() returns (uint256) { return super.getTimestamp(_roundId); } /* * v3 Aggregator interface */ /// @inheritdoc OffchainAggregator function description() public override view checkAccess() returns (string memory) { return super.description(); } /// @inheritdoc OffchainAggregator function getRoundData(uint80 _roundId) public override view checkAccess() returns ( uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound ) { return super.getRoundData(_roundId); } /// @inheritdoc OffchainAggregator function latestRoundData() public override view checkAccess() returns ( uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound ) { return super.latestRoundData(); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; interface AccessControllerInterface { function hasAccess(address user, bytes calldata data) external view returns (bool); }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; interface AggregatorInterface { function latestAnswer() external view returns (int256); function latestTimestamp() external view returns (uint256); function latestRound() external view returns (uint256); function getAnswer(uint256 roundId) external view returns (int256); function getTimestamp(uint256 roundId) external view returns (uint256); event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 updatedAt); event NewRound(uint256 indexed roundId, address indexed startedBy, uint256 startedAt); }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; import "./AggregatorInterface.sol"; import "./AggregatorV3Interface.sol"; interface AggregatorV2V3Interface is AggregatorInterface, AggregatorV3Interface { }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; interface AggregatorV3Interface { function decimals() external view returns (uint8); function description() external view returns (string memory); function version() external view returns (uint256); function getRoundData(uint80 _roundId) external view returns ( uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound ); function latestRoundData() external view returns ( uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound ); }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; interface AggregatorValidatorInterface { function validate( uint256 previousRoundId, int256 previousAnswer, uint256 currentRoundId, int256 currentAnswer ) external returns (bool); }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; interface LinkTokenInterface { function allowance(address owner, address spender) external view returns (uint256 remaining); function approve(address spender, uint256 value) external returns (bool success); function balanceOf(address owner) external view returns (uint256 balance); function decimals() external view returns (uint8 decimalPlaces); function decreaseApproval(address spender, uint256 addedValue) external returns (bool success); function increaseApproval(address spender, uint256 subtractedValue) external; function name() external view returns (string memory tokenName); function symbol() external view returns (string memory tokenSymbol); function totalSupply() external view returns (uint256 totalTokensIssued); function transfer(address to, uint256 value) external returns (bool success); function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool success); function transferFrom(address from, address to, uint256 value) external returns (bool success); }
// SPDX-License-Identifier: MIT pragma solidity 0.7.6; import "./AccessControllerInterface.sol"; import "./AggregatorV2V3Interface.sol"; import "./AggregatorValidatorInterface.sol"; import "./LinkTokenInterface.sol"; import "./Owned.sol"; import "./OffchainAggregatorBilling.sol"; import "./TypeAndVersionInterface.sol"; /** * @notice Onchain verification of reports from the offchain reporting protocol * @dev For details on its operation, see the offchain reporting protocol design * @dev doc, which refers to this contract as simply the "contract". */ contract OffchainAggregator is Owned, OffchainAggregatorBilling, AggregatorV2V3Interface, TypeAndVersionInterface { uint256 constant private maxUint32 = (1 << 32) - 1; // Storing these fields used on the hot path in a HotVars variable reduces the // retrieval of all of them to a single SLOAD. If any further fields are // added, make sure that storage of the struct still takes at most 32 bytes. struct HotVars { // Provides 128 bits of security against 2nd pre-image attacks, but only // 64 bits against collisions. This is acceptable, since a malicious owner has // easier way of messing up the protocol than to find hash collisions. bytes16 latestConfigDigest; uint40 latestEpochAndRound; // 32 most sig bits for epoch, 8 least sig bits for round // Current bound assumed on number of faulty/dishonest oracles participating // in the protocol, this value is referred to as f in the design uint8 threshold; // Chainlink Aggregators expose a roundId to consumers. The offchain reporting // protocol does not use this id anywhere. We increment it whenever a new // transmission is made to provide callers with contiguous ids for successive // reports. uint32 latestAggregatorRoundId; } HotVars internal s_hotVars; // Transmission records the median answer from the transmit transaction at // time timestamp struct Transmission { int192 answer; // 192 bits ought to be enough for anyone uint64 timestamp; } mapping(uint32 /* aggregator round ID */ => Transmission) internal s_transmissions; // incremented each time a new config is posted. This count is incorporated // into the config digest, to prevent replay attacks. uint32 internal s_configCount; uint32 internal s_latestConfigBlockNumber; // makes it easier for offchain systems // to extract config from logs. // Lowest answer the system is allowed to report in response to transmissions int192 immutable public minAnswer; // Highest answer the system is allowed to report in response to transmissions int192 immutable public maxAnswer; /* * @param _maximumGasPrice highest gas price for which transmitter will be compensated * @param _reasonableGasPrice transmitter will receive reward for gas prices under this value * @param _microLinkPerEth reimbursement per ETH of gas cost, in 1e-6LINK units * @param _linkGweiPerObservation reward to oracle for contributing an observation to a successfully transmitted report, in 1e-9LINK units * @param _linkGweiPerTransmission reward to transmitter of a successful report, in 1e-9LINK units * @param _link address of the LINK contract * @param _minAnswer lowest answer the median of a report is allowed to be * @param _maxAnswer highest answer the median of a report is allowed to be * @param _billingAccessController access controller for billing admin functions * @param _requesterAccessController access controller for requesting new rounds * @param _decimals answers are stored in fixed-point format, with this many digits of precision * @param _description short human-readable description of observable this contract's answers pertain to */ constructor( uint32 _maximumGasPrice, uint32 _reasonableGasPrice, uint32 _microLinkPerEth, uint32 _linkGweiPerObservation, uint32 _linkGweiPerTransmission, LinkTokenInterface _link, int192 _minAnswer, int192 _maxAnswer, AccessControllerInterface _billingAccessController, AccessControllerInterface _requesterAccessController, uint8 _decimals, string memory _description ) OffchainAggregatorBilling(_maximumGasPrice, _reasonableGasPrice, _microLinkPerEth, _linkGweiPerObservation, _linkGweiPerTransmission, _link, _billingAccessController ) { decimals = _decimals; s_description = _description; setRequesterAccessController(_requesterAccessController); setValidatorConfig(AggregatorValidatorInterface(0x0), 0); minAnswer = _minAnswer; maxAnswer = _maxAnswer; } /* * Versioning */ function typeAndVersion() external override pure virtual returns (string memory) { return "OffchainAggregator 4.0.0"; } /* * Config logic */ /** * @notice triggers a new run of the offchain reporting protocol * @param previousConfigBlockNumber block in which the previous config was set, to simplify historic analysis * @param configCount ordinal number of this config setting among all config settings over the life of this contract * @param signers ith element is address ith oracle uses to sign a report * @param transmitters ith element is address ith oracle uses to transmit a report via the transmit method * @param threshold maximum number of faulty/dishonest oracles the protocol can tolerate while still working correctly * @param encodedConfigVersion version of the serialization format used for "encoded" parameter * @param encoded serialized data used by oracles to configure their offchain operation */ event ConfigSet( uint32 previousConfigBlockNumber, uint64 configCount, address[] signers, address[] transmitters, uint8 threshold, uint64 encodedConfigVersion, bytes encoded ); // Reverts transaction if config args are invalid modifier checkConfigValid ( uint256 _numSigners, uint256 _numTransmitters, uint256 _threshold ) { require(_numSigners <= maxNumOracles, "too many signers"); require(_threshold > 0, "threshold must be positive"); require( _numSigners == _numTransmitters, "oracle addresses out of registration" ); require(_numSigners > 3*_threshold, "faulty-oracle threshold too high"); _; } /** * @notice sets offchain reporting protocol configuration incl. participating oracles * @param _signers addresses with which oracles sign the reports * @param _transmitters addresses oracles use to transmit the reports * @param _threshold number of faulty oracles the system can tolerate * @param _encodedConfigVersion version number for offchainEncoding schema * @param _encoded encoded off-chain oracle configuration */ function setConfig( address[] calldata _signers, address[] calldata _transmitters, uint8 _threshold, uint64 _encodedConfigVersion, bytes calldata _encoded ) external checkConfigValid(_signers.length, _transmitters.length, _threshold) onlyOwner() { while (s_signers.length != 0) { // remove any old signer/transmitter addresses uint lastIdx = s_signers.length - 1; address signer = s_signers[lastIdx]; address transmitter = s_transmitters[lastIdx]; payOracle(transmitter); delete s_oracles[signer]; delete s_oracles[transmitter]; s_signers.pop(); s_transmitters.pop(); } for (uint i = 0; i < _signers.length; i++) { // add new signer/transmitter addresses require( s_oracles[_signers[i]].role == Role.Unset, "repeated signer address" ); s_oracles[_signers[i]] = Oracle(uint8(i), Role.Signer); require(s_payees[_transmitters[i]] != address(0), "payee must be set"); require( s_oracles[_transmitters[i]].role == Role.Unset, "repeated transmitter address" ); s_oracles[_transmitters[i]] = Oracle(uint8(i), Role.Transmitter); s_signers.push(_signers[i]); s_transmitters.push(_transmitters[i]); } s_hotVars.threshold = _threshold; uint32 previousConfigBlockNumber = s_latestConfigBlockNumber; s_latestConfigBlockNumber = uint32(block.number); s_configCount += 1; uint64 configCount = s_configCount; { s_hotVars.latestConfigDigest = configDigestFromConfigData( address(this), configCount, _signers, _transmitters, _threshold, _encodedConfigVersion, _encoded ); s_hotVars.latestEpochAndRound = 0; } emit ConfigSet( previousConfigBlockNumber, configCount, _signers, _transmitters, _threshold, _encodedConfigVersion, _encoded ); } function configDigestFromConfigData( address _contractAddress, uint64 _configCount, address[] calldata _signers, address[] calldata _transmitters, uint8 _threshold, uint64 _encodedConfigVersion, bytes calldata _encodedConfig ) internal pure returns (bytes16) { return bytes16(keccak256(abi.encode(_contractAddress, _configCount, _signers, _transmitters, _threshold, _encodedConfigVersion, _encodedConfig ))); } /** * @notice information about current offchain reporting protocol configuration * @return configCount ordinal number of current config, out of all configs applied to this contract so far * @return blockNumber block at which this config was set * @return configDigest domain-separation tag for current config (see configDigestFromConfigData) */ function latestConfigDetails() external view returns ( uint32 configCount, uint32 blockNumber, bytes16 configDigest ) { return (s_configCount, s_latestConfigBlockNumber, s_hotVars.latestConfigDigest); } /** * @return list of addresses permitted to transmit reports to this contract * @dev The list will match the order used to specify the transmitter during setConfig */ function transmitters() external view returns(address[] memory) { return s_transmitters; } /* * On-chain validation logc */ // Configuration for validator struct ValidatorConfig { AggregatorValidatorInterface validator; uint32 gasLimit; } ValidatorConfig private s_validatorConfig; /** * @notice indicates that the validator configuration has been set * @param previousValidator previous validator contract * @param previousGasLimit previous gas limit for validate calls * @param currentValidator current validator contract * @param currentGasLimit current gas limit for validate calls */ event ValidatorConfigSet( AggregatorValidatorInterface indexed previousValidator, uint32 previousGasLimit, AggregatorValidatorInterface indexed currentValidator, uint32 currentGasLimit ); /** * @notice validator configuration * @return validator validator contract * @return gasLimit gas limit for validate calls */ function validatorConfig() external view returns (AggregatorValidatorInterface validator, uint32 gasLimit) { ValidatorConfig memory vc = s_validatorConfig; return (vc.validator, vc.gasLimit); } /** * @notice sets validator configuration * @dev set _newValidator to 0x0 to disable validate calls * @param _newValidator address of the new validator contract * @param _newGasLimit new gas limit for validate calls */ function setValidatorConfig(AggregatorValidatorInterface _newValidator, uint32 _newGasLimit) public onlyOwner() { ValidatorConfig memory previous = s_validatorConfig; if (previous.validator != _newValidator || previous.gasLimit != _newGasLimit) { s_validatorConfig = ValidatorConfig({ validator: _newValidator, gasLimit: _newGasLimit }); emit ValidatorConfigSet(previous.validator, previous.gasLimit, _newValidator, _newGasLimit); } } function validateAnswer( uint32 _aggregatorRoundId, int256 _answer ) private { ValidatorConfig memory vc = s_validatorConfig; if (address(vc.validator) == address(0)) { return; } uint32 prevAggregatorRoundId = _aggregatorRoundId - 1; int256 prevAggregatorRoundAnswer = s_transmissions[prevAggregatorRoundId].answer; require( callWithExactGasEvenIfTargetIsNoContract( vc.gasLimit, address(vc.validator), abi.encodeWithSignature( "validate(uint256,int256,uint256,int256)", uint256(prevAggregatorRoundId), prevAggregatorRoundAnswer, uint256(_aggregatorRoundId), _answer ) ), "insufficient gas" ); } uint256 private constant CALL_WITH_EXACT_GAS_CUSHION = 5_000; /** * @dev calls target address with exactly gasAmount gas and data as calldata * or reverts if at least gasAmount gas is not available. */ function callWithExactGasEvenIfTargetIsNoContract( uint256 _gasAmount, address _target, bytes memory _data ) private returns (bool sufficientGas) { // solhint-disable-next-line no-inline-assembly assembly { let g := gas() // Compute g -= CALL_WITH_EXACT_GAS_CUSHION and check for underflow. We // need the cushion since the logic following the above call to gas also // costs gas which we cannot account for exactly. So cushion is a // conservative upper bound for the cost of this logic. if iszero(lt(g, CALL_WITH_EXACT_GAS_CUSHION)) { g := sub(g, CALL_WITH_EXACT_GAS_CUSHION) // If g - g//64 <= _gasAmount, we don't have enough gas. (We subtract g//64 // because of EIP-150.) if gt(sub(g, div(g, 64)), _gasAmount) { // Call and ignore success/return data. Note that we did not check // whether a contract actually exists at the _target address. pop(call(_gasAmount, _target, 0, add(_data, 0x20), mload(_data), 0, 0)) sufficientGas := true } } } } /* * requestNewRound logic */ AccessControllerInterface internal s_requesterAccessController; /** * @notice emitted when a new requester access controller contract is set * @param old the address prior to the current setting * @param current the address of the new access controller contract */ event RequesterAccessControllerSet(AccessControllerInterface old, AccessControllerInterface current); /** * @notice emitted to immediately request a new round * @param requester the address of the requester * @param configDigest the latest transmission's configDigest * @param epoch the latest transmission's epoch * @param round the latest transmission's round */ event RoundRequested(address indexed requester, bytes16 configDigest, uint32 epoch, uint8 round); /** * @notice address of the requester access controller contract * @return requester access controller address */ function requesterAccessController() external view returns (AccessControllerInterface) { return s_requesterAccessController; } /** * @notice sets the requester access controller * @param _requesterAccessController designates the address of the new requester access controller */ function setRequesterAccessController(AccessControllerInterface _requesterAccessController) public onlyOwner() { AccessControllerInterface oldController = s_requesterAccessController; if (_requesterAccessController != oldController) { s_requesterAccessController = AccessControllerInterface(_requesterAccessController); emit RequesterAccessControllerSet(oldController, _requesterAccessController); } } /** * @notice immediately requests a new round * @return the aggregatorRoundId of the next round. Note: The report for this round may have been * transmitted (but not yet mined) *before* requestNewRound() was even called. There is *no* * guarantee of causality between the request and the report at aggregatorRoundId. */ function requestNewRound() external returns (uint80) { require(msg.sender == owner || s_requesterAccessController.hasAccess(msg.sender, msg.data), "Only owner&requester can call"); HotVars memory hotVars = s_hotVars; emit RoundRequested( msg.sender, hotVars.latestConfigDigest, uint32(s_hotVars.latestEpochAndRound >> 8), uint8(s_hotVars.latestEpochAndRound) ); return hotVars.latestAggregatorRoundId + 1; } /* * Transmission logic */ /** * @notice indicates that a new report was transmitted * @param aggregatorRoundId the round to which this report was assigned * @param answer median of the observations attached this report * @param transmitter address from which the report was transmitted * @param observations observations transmitted with this report * @param rawReportContext signature-replay-prevention domain-separation tag */ event NewTransmission( uint32 indexed aggregatorRoundId, int192 answer, address transmitter, int192[] observations, bytes observers, bytes32 rawReportContext ); // decodeReport is used to check that the solidity and go code are using the // same format. See TestOffchainAggregator.testDecodeReport and TestReportParsing function decodeReport(bytes memory _report) internal pure returns ( bytes32 rawReportContext, bytes32 rawObservers, int192[] memory observations ) { (rawReportContext, rawObservers, observations) = abi.decode(_report, (bytes32, bytes32, int192[])); } // Used to relieve stack pressure in transmit struct ReportData { HotVars hotVars; // Only read from storage once bytes observers; // ith element is the index of the ith observer int192[] observations; // ith element is the ith observation bytes vs; // jth element is the v component of the jth signature bytes32 rawReportContext; } /* * @notice details about the most recent report * @return configDigest domain separation tag for the latest report * @return epoch epoch in which the latest report was generated * @return round OCR round in which the latest report was generated * @return latestAnswer median value from latest report * @return latestTimestamp when the latest report was transmitted */ function latestTransmissionDetails() external view returns ( bytes16 configDigest, uint32 epoch, uint8 round, int192 latestAnswer, uint64 latestTimestamp ) { require(msg.sender == tx.origin, "Only callable by EOA"); return ( s_hotVars.latestConfigDigest, uint32(s_hotVars.latestEpochAndRound >> 8), uint8(s_hotVars.latestEpochAndRound), s_transmissions[s_hotVars.latestAggregatorRoundId].answer, s_transmissions[s_hotVars.latestAggregatorRoundId].timestamp ); } // The constant-length components of the msg.data sent to transmit. // See the "If we wanted to call sam" example on for example reasoning // https://solidity.readthedocs.io/en/v0.7.2/abi-spec.html uint16 private constant TRANSMIT_MSGDATA_CONSTANT_LENGTH_COMPONENT = 4 + // function selector 32 + // word containing start location of abiencoded _report value 32 + // word containing location start of abiencoded _rs value 32 + // word containing start location of abiencoded _ss value 32 + // _rawVs value 32 + // word containing length of _report 32 + // word containing length _rs 32 + // word containing length of _ss 0; // placeholder function expectedMsgDataLength( bytes calldata _report, bytes32[] calldata _rs, bytes32[] calldata _ss ) private pure returns (uint256 length) { // calldata will never be big enough to make this overflow return uint256(TRANSMIT_MSGDATA_CONSTANT_LENGTH_COMPONENT) + _report.length + // one byte pure entry in _report _rs.length * 32 + // 32 bytes per entry in _rs _ss.length * 32 + // 32 bytes per entry in _ss 0; // placeholder } /** * @notice transmit is called to post a new report to the contract * @param _report serialized report, which the signatures are signing. See parsing code below for format. The ith element of the observers component must be the index in s_signers of the address for the ith signature * @param _rs ith element is the R components of the ith signature on report. Must have at most maxNumOracles entries * @param _ss ith element is the S components of the ith signature on report. Must have at most maxNumOracles entries * @param _rawVs ith element is the the V component of the ith signature */ function transmit( // NOTE: If these parameters are changed, expectedMsgDataLength and/or // TRANSMIT_MSGDATA_CONSTANT_LENGTH_COMPONENT need to be changed accordingly bytes calldata _report, bytes32[] calldata _rs, bytes32[] calldata _ss, bytes32 _rawVs // signatures ) external { uint256 initialGas = gasleft(); // This line must come first // Make sure the transmit message-length matches the inputs. Otherwise, the // transmitter could append an arbitrarily long (up to gas-block limit) // string of 0 bytes, which we would reimburse at a rate of 16 gas/byte, but // which would only cost the transmitter 4 gas/byte. (Appendix G of the // yellow paper, p. 25, for G_txdatazero and EIP 2028 for G_txdatanonzero.) // This could amount to reimbursement profit of 36 million gas, given a 3MB // zero tail. require(msg.data.length == expectedMsgDataLength(_report, _rs, _ss), "transmit message too long"); ReportData memory r; // Relieves stack pressure { r.hotVars = s_hotVars; // cache read from storage bytes32 rawObservers; (r.rawReportContext, rawObservers, r.observations) = abi.decode( _report, (bytes32, bytes32, int192[]) ); // rawReportContext consists of: // 11-byte zero padding // 16-byte configDigest // 4-byte epoch // 1-byte round bytes16 configDigest = bytes16(r.rawReportContext << 88); require( r.hotVars.latestConfigDigest == configDigest, "configDigest mismatch" ); uint40 epochAndRound = uint40(uint256(r.rawReportContext)); // direct numerical comparison works here, because // // ((e,r) <= (e',r')) implies (epochAndRound <= epochAndRound') // // because alphabetic ordering implies e <= e', and if e = e', then r<=r', // so e*256+r <= e'*256+r', because r, r' < 256 require(r.hotVars.latestEpochAndRound < epochAndRound, "stale report"); require(_rs.length > r.hotVars.threshold, "not enough signatures"); require(_rs.length <= maxNumOracles, "too many signatures"); require(_ss.length == _rs.length, "signatures out of registration"); require(r.observations.length <= maxNumOracles, "num observations out of bounds"); require(r.observations.length > 2 * r.hotVars.threshold, "too few values to trust median"); // Copy signature parities in bytes32 _rawVs to bytes r.v r.vs = new bytes(_rs.length); for (uint8 i = 0; i < _rs.length; i++) { r.vs[i] = _rawVs[i]; } // Copy observer identities in bytes32 rawObservers to bytes r.observers r.observers = new bytes(r.observations.length); bool[maxNumOracles] memory seen; for (uint8 i = 0; i < r.observations.length; i++) { uint8 observerIdx = uint8(rawObservers[i]); require(!seen[observerIdx], "observer index repeated"); seen[observerIdx] = true; r.observers[i] = rawObservers[i]; } Oracle memory transmitter = s_oracles[msg.sender]; require( // Check that sender is authorized to report transmitter.role == Role.Transmitter && msg.sender == s_transmitters[transmitter.index], "unauthorized transmitter" ); // record epochAndRound here, so that we don't have to carry the local // variable in transmit. The change is reverted if something fails later. r.hotVars.latestEpochAndRound = epochAndRound; } { // Verify signatures attached to report bytes32 h = keccak256(_report); bool[maxNumOracles] memory signed; Oracle memory o; for (uint i = 0; i < _rs.length; i++) { address signer = ecrecover(h, uint8(r.vs[i])+27, _rs[i], _ss[i]); o = s_oracles[signer]; require(o.role == Role.Signer, "address not authorized to sign"); require(!signed[o.index], "non-unique signature"); signed[o.index] = true; } } { // Check the report contents, and record the result for (uint i = 0; i < r.observations.length - 1; i++) { bool inOrder = r.observations[i] <= r.observations[i+1]; require(inOrder, "observations not sorted"); } int192 median = r.observations[r.observations.length/2]; require(minAnswer <= median && median <= maxAnswer, "median is out of min-max range"); r.hotVars.latestAggregatorRoundId++; s_transmissions[r.hotVars.latestAggregatorRoundId] = Transmission(median, uint64(block.timestamp)); emit NewTransmission( r.hotVars.latestAggregatorRoundId, median, msg.sender, r.observations, r.observers, r.rawReportContext ); // Emit these for backwards compatability with offchain consumers // that only support legacy events emit NewRound( r.hotVars.latestAggregatorRoundId, address(0x0), // use zero address since we don't have anybody "starting" the round here block.timestamp ); emit AnswerUpdated( median, r.hotVars.latestAggregatorRoundId, block.timestamp ); validateAnswer(r.hotVars.latestAggregatorRoundId, median); } s_hotVars = r.hotVars; assert(initialGas < maxUint32); reimburseAndRewardOracles(uint32(initialGas), r.observers); } /* * v2 Aggregator interface */ /** * @notice median from the most recent report */ function latestAnswer() public override view virtual returns (int256) { return s_transmissions[s_hotVars.latestAggregatorRoundId].answer; } /** * @notice timestamp of block in which last report was transmitted */ function latestTimestamp() public override view virtual returns (uint256) { return s_transmissions[s_hotVars.latestAggregatorRoundId].timestamp; } /** * @notice Aggregator round (NOT OCR round) in which last report was transmitted */ function latestRound() public override view virtual returns (uint256) { return s_hotVars.latestAggregatorRoundId; } /** * @notice median of report from given aggregator round (NOT OCR round) * @param _roundId the aggregator round of the target report */ function getAnswer(uint256 _roundId) public override view virtual returns (int256) { if (_roundId > 0xFFFFFFFF) { return 0; } return s_transmissions[uint32(_roundId)].answer; } /** * @notice timestamp of block in which report from given aggregator round was transmitted * @param _roundId aggregator round (NOT OCR round) of target report */ function getTimestamp(uint256 _roundId) public override view virtual returns (uint256) { if (_roundId > 0xFFFFFFFF) { return 0; } return s_transmissions[uint32(_roundId)].timestamp; } /* * v3 Aggregator interface */ string constant private V3_NO_DATA_ERROR = "No data present"; /** * @return answers are stored in fixed-point format, with this many digits of precision */ uint8 immutable public override decimals; /** * @notice aggregator contract version */ uint256 constant public override version = 4; string internal s_description; /** * @notice human-readable description of observable this contract is reporting on */ function description() public override view virtual returns (string memory) { return s_description; } /** * @notice details for the given aggregator round * @param _roundId target aggregator round (NOT OCR round). Must fit in uint32 * @return roundId _roundId * @return answer median of report from given _roundId * @return startedAt timestamp of block in which report from given _roundId was transmitted * @return updatedAt timestamp of block in which report from given _roundId was transmitted * @return answeredInRound _roundId */ function getRoundData(uint80 _roundId) public override view virtual returns ( uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound ) { require(_roundId <= 0xFFFFFFFF, V3_NO_DATA_ERROR); Transmission memory transmission = s_transmissions[uint32(_roundId)]; return ( _roundId, transmission.answer, transmission.timestamp, transmission.timestamp, _roundId ); } /** * @notice aggregator details for the most recently transmitted report * @return roundId aggregator round of latest report (NOT OCR round) * @return answer median of latest report * @return startedAt timestamp of block containing latest report * @return updatedAt timestamp of block containing latest report * @return answeredInRound aggregator round of latest report */ function latestRoundData() public override view virtual returns ( uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound ) { roundId = s_hotVars.latestAggregatorRoundId; // Skipped for compatability with existing FluxAggregator in which latestRoundData never reverts. // require(roundId != 0, V3_NO_DATA_ERROR); Transmission memory transmission = s_transmissions[uint32(roundId)]; return ( roundId, transmission.answer, transmission.timestamp, transmission.timestamp, roundId ); } }
// SPDX-License-Identifier: MIT pragma solidity 0.7.6; import "./AccessControllerInterface.sol"; import "./LinkTokenInterface.sol"; import "./Owned.sol"; /** * @notice tracks administration of oracle-reward and gas-reimbursement parameters. * @dev * If you read or change this, be sure to read or adjust the comments. They * track the units of the values under consideration, and are crucial to * the readability of the operations it specifies. * @notice * Trust Model: * Nothing in this contract prevents a billing admin from setting insane * values for the billing parameters in setBilling. Oracles * participating in this contract should regularly check that the * parameters make sense. Similarly, the outstanding obligations of this * contract to the oracles can exceed the funds held by the contract. * Oracles participating in this contract should regularly check that it * holds sufficient funds and stop interacting with it if funding runs * out. * This still leaves oracles with some risk due to TOCTOU issues. * However, since the sums involved are pretty small (Ethereum * transactions aren't that expensive in the end) and an oracle would * likely stop participating in a contract it repeatedly lost money on, * this risk is deemed acceptable. Oracles should also regularly * withdraw any funds in the contract to prevent issues where the * contract becomes underfunded at a later time, and different oracles * are competing for the left-over funds. * Finally, note that any change to the set of oracles or to the billing * parameters will trigger payout of all oracles first (using the old * parameters), a billing admin cannot take away funds that are already * marked for payment. */ contract OffchainAggregatorBilling is Owned { // Maximum number of oracles the offchain reporting protocol is designed for uint256 constant internal maxNumOracles = 31; // Parameters for oracle payments struct Billing { // Highest compensated gas price, in ETH-gwei uints uint32 maximumGasPrice; // If gas price is less (in ETH-gwei units), transmitter gets half the savings uint32 reasonableGasPrice; // Pay transmitter back this much LINK per unit eth spent on gas // (1e-6LINK/ETH units) uint32 microLinkPerEth; // Fixed LINK reward for each observer, in LINK-gwei units uint32 linkGweiPerObservation; // Fixed reward for transmitter, in linkGweiPerObservation units uint32 linkGweiPerTransmission; } Billing internal s_billing; // We assume that the token contract is correct. This contract is not written // to handle misbehaving ERC20 tokens! LinkTokenInterface internal s_linkToken; AccessControllerInterface internal s_billingAccessController; // ith element is number of observation rewards due to ith process, plus one. // This is expected to saturate after an oracle has submitted 65,535 // observations, or about 65535/(3*24*20) = 45 days, given a transmission // every 3 minutes. // // This is always one greater than the actual value, so that when the value is // reset to zero, we don't end up with a zero value in storage (which would // result in a higher gas cost, the next time the value is incremented.) // Calculations using this variable need to take that offset into account. uint16[maxNumOracles] internal s_oracleObservationsCounts; // Addresses at which oracles want to receive payments, by transmitter address mapping (address /* transmitter */ => address /* payment address */) internal s_payees; // Payee addresses which must be approved by the owner mapping (address /* transmitter */ => address /* payment address */) internal s_proposedPayees; // LINK-wei-denominated reimbursements for gas used by transmitters. // // This is always one greater than the actual value, so that when the value is // reset to zero, we don't end up with a zero value in storage (which would // result in a higher gas cost, the next time the value is incremented.) // Calculations using this variable need to take that offset into account. // // Argument for overflow safety: // We have the following maximum intermediate values: // - 2**40 additions to this variable (epochAndRound is a uint40) // - 2**32 gas price in ethgwei/gas // - 1e9 ethwei/ethgwei // - 2**32 gas since the block gas limit is at ~20 million // - 2**32 (microlink/eth) // And we have 2**40 * 2**32 * 1e9 * 2**32 * 2**32 < 2**166 // (we also divide in some places, but that only makes the value smaller) // We can thus safely use uint256 intermediate values for the computation // updating this variable. uint256[maxNumOracles] internal s_gasReimbursementsLinkWei; // Used for s_oracles[a].role, where a is an address, to track the purpose // of the address, or to indicate that the address is unset. enum Role { // No oracle role has been set for address a Unset, // Signing address for the s_oracles[a].index'th oracle. I.e., report // signatures from this oracle should ecrecover back to address a. Signer, // Transmission address for the s_oracles[a].index'th oracle. I.e., if a // report is received by OffchainAggregator.transmit in which msg.sender is // a, it is attributed to the s_oracles[a].index'th oracle. Transmitter } struct Oracle { uint8 index; // Index of oracle in s_signers/s_transmitters Role role; // Role of the address which mapped to this struct } mapping (address /* signer OR transmitter address */ => Oracle) internal s_oracles; // s_signers contains the signing address of each oracle address[] internal s_signers; // s_transmitters contains the transmission address of each oracle, // i.e. the address the oracle actually sends transactions to the contract from address[] internal s_transmitters; uint256 constant private maxUint16 = (1 << 16) - 1; uint256 constant internal maxUint128 = (1 << 128) - 1; constructor( uint32 _maximumGasPrice, uint32 _reasonableGasPrice, uint32 _microLinkPerEth, uint32 _linkGweiPerObservation, uint32 _linkGweiPerTransmission, LinkTokenInterface _link, AccessControllerInterface _billingAccessController ) { setBillingInternal(_maximumGasPrice, _reasonableGasPrice, _microLinkPerEth, _linkGweiPerObservation, _linkGweiPerTransmission); s_linkToken = _link; emit LinkTokenSet(LinkTokenInterface(address(0)), _link); setBillingAccessControllerInternal(_billingAccessController); uint16[maxNumOracles] memory counts; // See s_oracleObservationsCounts docstring uint256[maxNumOracles] memory gas; // see s_gasReimbursementsLinkWei docstring for (uint8 i = 0; i < maxNumOracles; i++) { counts[i] = 1; gas[i] = 1; } s_oracleObservationsCounts = counts; s_gasReimbursementsLinkWei = gas; } /* * @notice emitted when the LINK token contract is set * @param _oldLinkToken the address of the old LINK token contract * @param _newLinkToken the address of the new LINK token contract */ event LinkTokenSet( LinkTokenInterface indexed _oldLinkToken, LinkTokenInterface indexed _newLinkToken ); /* * @notice sets the LINK token contract used for paying oracles * @param _linkToken the address of the LINK token contract * @param _recipient remaining funds from the previous token contract are transfered * here * @dev this function will return early (without an error) without changing any state * if _linkToken equals getLinkToken(). * @dev this will trigger a payout so that a malicious owner cannot take from oracles * what is already owed to them. * @dev we assume that the token contract is correct. This contract is not written * to handle misbehaving ERC20 tokens! */ function setLinkToken( LinkTokenInterface _linkToken, address _recipient ) external onlyOwner() { LinkTokenInterface oldLinkToken = s_linkToken; if (_linkToken == oldLinkToken) { // No change, nothing to be done return; } // call balanceOf as a sanity check on whether we're talking to a token // contract _linkToken.balanceOf(address(this)); // we break CEI here, but that's okay because we're dealing with a correct // token contract (by assumption). payOracles(); uint256 remainingBalance = oldLinkToken.balanceOf(address(this)); require(oldLinkToken.transfer(_recipient, remainingBalance), "transfer remaining funds failed"); s_linkToken = _linkToken; emit LinkTokenSet(oldLinkToken, _linkToken); } /* * @notice gets the LINK token contract used for paying oracles * @return linkToken the address of the LINK token contract */ function getLinkToken() external view returns(LinkTokenInterface linkToken) { return s_linkToken; } /** * @notice emitted when billing parameters are set * @param maximumGasPrice highest gas price for which transmitter will be compensated * @param reasonableGasPrice transmitter will receive reward for gas prices under this value * @param microLinkPerEth reimbursement per ETH of gas cost, in 1e-6LINK units * @param linkGweiPerObservation reward to oracle for contributing an observation to a successfully transmitted report, in 1e-9LINK units * @param linkGweiPerTransmission reward to transmitter of a successful report, in 1e-9LINK units */ event BillingSet( uint32 maximumGasPrice, uint32 reasonableGasPrice, uint32 microLinkPerEth, uint32 linkGweiPerObservation, uint32 linkGweiPerTransmission ); function setBillingInternal( uint32 _maximumGasPrice, uint32 _reasonableGasPrice, uint32 _microLinkPerEth, uint32 _linkGweiPerObservation, uint32 _linkGweiPerTransmission ) internal { s_billing = Billing(_maximumGasPrice, _reasonableGasPrice, _microLinkPerEth, _linkGweiPerObservation, _linkGweiPerTransmission); emit BillingSet(_maximumGasPrice, _reasonableGasPrice, _microLinkPerEth, _linkGweiPerObservation, _linkGweiPerTransmission); } /** * @notice sets billing parameters * @param _maximumGasPrice highest gas price for which transmitter will be compensated * @param _reasonableGasPrice transmitter will receive reward for gas prices under this value * @param _microLinkPerEth reimbursement per ETH of gas cost, in 1e-6LINK units * @param _linkGweiPerObservation reward to oracle for contributing an observation to a successfully transmitted report, in 1e-9LINK units * @param _linkGweiPerTransmission reward to transmitter of a successful report, in 1e-9LINK units * @dev access control provided by billingAccessController */ function setBilling( uint32 _maximumGasPrice, uint32 _reasonableGasPrice, uint32 _microLinkPerEth, uint32 _linkGweiPerObservation, uint32 _linkGweiPerTransmission ) external { AccessControllerInterface access = s_billingAccessController; require(msg.sender == owner || access.hasAccess(msg.sender, msg.data), "Only owner&billingAdmin can call"); payOracles(); setBillingInternal(_maximumGasPrice, _reasonableGasPrice, _microLinkPerEth, _linkGweiPerObservation, _linkGweiPerTransmission); } /** * @notice gets billing parameters * @param maximumGasPrice highest gas price for which transmitter will be compensated * @param reasonableGasPrice transmitter will receive reward for gas prices under this value * @param microLinkPerEth reimbursement per ETH of gas cost, in 1e-6LINK units * @param linkGweiPerObservation reward to oracle for contributing an observation to a successfully transmitted report, in 1e-9LINK units * @param linkGweiPerTransmission reward to transmitter of a successful report, in 1e-9LINK units */ function getBilling() external view returns ( uint32 maximumGasPrice, uint32 reasonableGasPrice, uint32 microLinkPerEth, uint32 linkGweiPerObservation, uint32 linkGweiPerTransmission ) { Billing memory billing = s_billing; return ( billing.maximumGasPrice, billing.reasonableGasPrice, billing.microLinkPerEth, billing.linkGweiPerObservation, billing.linkGweiPerTransmission ); } /** * @notice emitted when a new access-control contract is set * @param old the address prior to the current setting * @param current the address of the new access-control contract */ event BillingAccessControllerSet(AccessControllerInterface old, AccessControllerInterface current); function setBillingAccessControllerInternal(AccessControllerInterface _billingAccessController) internal { AccessControllerInterface oldController = s_billingAccessController; if (_billingAccessController != oldController) { s_billingAccessController = _billingAccessController; emit BillingAccessControllerSet( oldController, _billingAccessController ); } } /** * @notice sets billingAccessController * @param _billingAccessController new billingAccessController contract address * @dev only owner can call this */ function setBillingAccessController(AccessControllerInterface _billingAccessController) external onlyOwner { setBillingAccessControllerInternal(_billingAccessController); } /** * @notice gets billingAccessController * @return address of billingAccessController contract */ function billingAccessController() external view returns (AccessControllerInterface) { return s_billingAccessController; } /** * @notice withdraws an oracle's payment from the contract * @param _transmitter the transmitter address of the oracle * @dev must be called by oracle's payee address */ function withdrawPayment(address _transmitter) external { require(msg.sender == s_payees[_transmitter], "Only payee can withdraw"); payOracle(_transmitter); } /** * @notice query an oracle's payment amount * @param _transmitter the transmitter address of the oracle */ function owedPayment(address _transmitter) public view returns (uint256) { Oracle memory oracle = s_oracles[_transmitter]; if (oracle.role == Role.Unset) { return 0; } Billing memory billing = s_billing; uint256 linkWeiAmount = uint256(s_oracleObservationsCounts[oracle.index] - 1) * uint256(billing.linkGweiPerObservation) * (1 gwei); linkWeiAmount += s_gasReimbursementsLinkWei[oracle.index] - 1; return linkWeiAmount; } /** * @notice emitted when an oracle has been paid LINK * @param transmitter address from which the oracle sends reports to the transmit method * @param payee address to which the payment is sent * @param amount amount of LINK sent * @param linkToken address of the LINK token contract */ event OraclePaid( address indexed transmitter, address indexed payee, uint256 amount, LinkTokenInterface indexed linkToken ); // payOracle pays out _transmitter's balance to the corresponding payee, and zeros it out function payOracle(address _transmitter) internal { Oracle memory oracle = s_oracles[_transmitter]; uint256 linkWeiAmount = owedPayment(_transmitter); if (linkWeiAmount > 0) { address payee = s_payees[_transmitter]; // Poses no re-entrancy issues, because LINK.transfer does not yield // control flow. require(s_linkToken.transfer(payee, linkWeiAmount), "insufficient funds"); s_oracleObservationsCounts[oracle.index] = 1; // "zero" the counts. see var's docstring s_gasReimbursementsLinkWei[oracle.index] = 1; // "zero" the counts. see var's docstring emit OraclePaid(_transmitter, payee, linkWeiAmount, s_linkToken); } } // payOracles pays out all transmitters, and zeros out their balances. // // It's much more gas-efficient to do this as a single operation, to avoid // hitting storage too much. function payOracles() internal { Billing memory billing = s_billing; LinkTokenInterface linkToken = s_linkToken; uint16[maxNumOracles] memory observationsCounts = s_oracleObservationsCounts; uint256[maxNumOracles] memory gasReimbursementsLinkWei = s_gasReimbursementsLinkWei; address[] memory transmitters = s_transmitters; for (uint transmitteridx = 0; transmitteridx < transmitters.length; transmitteridx++) { uint256 reimbursementAmountLinkWei = gasReimbursementsLinkWei[transmitteridx] - 1; uint256 obsCount = observationsCounts[transmitteridx] - 1; uint256 linkWeiAmount = obsCount * uint256(billing.linkGweiPerObservation) * (1 gwei) + reimbursementAmountLinkWei; if (linkWeiAmount > 0) { address payee = s_payees[transmitters[transmitteridx]]; // Poses no re-entrancy issues, because LINK.transfer does not yield // control flow. require(linkToken.transfer(payee, linkWeiAmount), "insufficient funds"); observationsCounts[transmitteridx] = 1; // "zero" the counts. gasReimbursementsLinkWei[transmitteridx] = 1; // "zero" the counts. emit OraclePaid(transmitters[transmitteridx], payee, linkWeiAmount, linkToken); } } // "Zero" the accounting storage variables s_oracleObservationsCounts = observationsCounts; s_gasReimbursementsLinkWei = gasReimbursementsLinkWei; } function oracleRewards( bytes memory observers, uint16[maxNumOracles] memory observations ) internal pure returns (uint16[maxNumOracles] memory) { // reward each observer-participant with the observer reward for (uint obsIdx = 0; obsIdx < observers.length; obsIdx++) { uint8 observer = uint8(observers[obsIdx]); observations[observer] = saturatingAddUint16(observations[observer], 1); } return observations; } // This value needs to change if maxNumOracles is increased, or the accounting // calculations at the bottom of reimburseAndRewardOracles change. // // To recalculate it, run the profiler as described in // ../../profile/README.md, and add up the gas-usage values reported for the // lines in reimburseAndRewardOracles following the "gasLeft = gasleft()" // line. E.g., you will see output like this: // // 7 uint256 gasLeft = gasleft(); // 29 uint256 gasCostEthWei = transmitterGasCostEthWei( // 9 uint256(initialGas), // 3 gasPrice, // 3 callDataGasCost, // 3 gasLeft // . // . // . // 59 uint256 gasCostLinkWei = (gasCostEthWei * billing.microLinkPerEth)/ 1e6; // . // . // . // 5047 s_gasReimbursementsLinkWei[txOracle.index] = // 856 s_gasReimbursementsLinkWei[txOracle.index] + gasCostLinkWei + // 26 uint256(billing.linkGweiPerTransmission) * (1 gwei); // // If those were the only lines to be accounted for, you would add up // 29+9+3+3+3+59+5047+856+26=6035. uint256 internal constant accountingGasCost = 6035; // Uncomment the following declaration to compute the remaining gas cost after // above gasleft(). (This must exist in a base class to OffchainAggregator, so // it can't go in TestOffchainAggregator.) // // uint256 public gasUsedInAccounting; // Gas price at which the transmitter should be reimbursed, in ETH-gwei/gas function impliedGasPrice( uint256 txGasPrice, // ETH-gwei/gas units uint256 reasonableGasPrice, // ETH-gwei/gas units uint256 maximumGasPrice // ETH-gwei/gas units ) internal pure returns (uint256) { // Reward the transmitter for choosing an efficient gas price: if they manage // to come in lower than considered reasonable, give them half the savings. // // The following calculations are all in units of gwei/gas, i.e. 1e-9ETH/gas uint256 gasPrice = txGasPrice; if (txGasPrice < reasonableGasPrice) { // Give transmitter half the savings for coming in under the reasonable gas price gasPrice += (reasonableGasPrice - txGasPrice) / 2; } // Don't reimburse a gas price higher than maximumGasPrice return min(gasPrice, maximumGasPrice); } // gas reimbursement due the transmitter, in ETH-wei // // If this function is changed, accountingGasCost needs to change, too. See // its docstring function transmitterGasCostEthWei( uint256 initialGas, uint256 gasPrice, // ETH-gwei/gas units uint256 callDataCost, // gas units uint256 gasLeft ) internal pure returns (uint128 gasCostEthWei) { require(initialGas >= gasLeft, "gasLeft cannot exceed initialGas"); uint256 gasUsed = // gas units initialGas - gasLeft + // observed gas usage callDataCost + accountingGasCost; // estimated gas usage // gasUsed is in gas units, gasPrice is in ETH-gwei/gas units; convert to ETH-wei uint256 fullGasCostEthWei = gasUsed * gasPrice * (1 gwei); assert(fullGasCostEthWei < maxUint128); // the entire ETH supply fits in a uint128... return uint128(fullGasCostEthWei); } /** * @notice withdraw any available funds left in the contract, up to _amount, after accounting for the funds due to participants in past reports * @param _recipient address to send funds to * @param _amount maximum amount to withdraw, denominated in LINK-wei. * @dev access control provided by billingAccessController */ function withdrawFunds(address _recipient, uint256 _amount) external { require(msg.sender == owner || s_billingAccessController.hasAccess(msg.sender, msg.data), "Only owner&billingAdmin can call"); uint256 linkDue = totalLINKDue(); uint256 linkBalance = s_linkToken.balanceOf(address(this)); require(linkBalance >= linkDue, "insufficient balance"); require(s_linkToken.transfer(_recipient, min(linkBalance - linkDue, _amount)), "insufficient funds"); } // Total LINK due to participants in past reports. function totalLINKDue() internal view returns (uint256 linkDue) { // Argument for overflow safety: We do all computations in // uint256s. The inputs to linkDue are: // - the <= 31 observation rewards each of which has less than // 64 bits (32 bits for billing.linkGweiPerObservation, 32 bits // for wei/gwei conversion). Hence 69 bits are sufficient for this part. // - the <= 31 gas reimbursements, each of which consists of at most 166 // bits (see s_gasReimbursementsLinkWei docstring). Hence 171 bits are // sufficient for this part // In total, 172 bits are enough. uint16[maxNumOracles] memory observationCounts = s_oracleObservationsCounts; for (uint i = 0; i < maxNumOracles; i++) { linkDue += observationCounts[i] - 1; // Stored value is one greater than actual value } Billing memory billing = s_billing; // Convert linkGweiPerObservation to uint256, or this overflows! linkDue *= uint256(billing.linkGweiPerObservation) * (1 gwei); address[] memory transmitters = s_transmitters; uint256[maxNumOracles] memory gasReimbursementsLinkWei = s_gasReimbursementsLinkWei; for (uint i = 0; i < transmitters.length; i++) { linkDue += uint256(gasReimbursementsLinkWei[i]-1); // Stored value is one greater than actual value } } /** * @notice allows oracles to check that sufficient LINK balance is available * @return availableBalance LINK available on this contract, after accounting for outstanding obligations. can become negative */ function linkAvailableForPayment() external view returns (int256 availableBalance) { // there are at most one billion LINK, so this cast is safe int256 balance = int256(s_linkToken.balanceOf(address(this))); // according to the argument in the definition of totalLINKDue, // totalLINKDue is never greater than 2**172, so this cast is safe int256 due = int256(totalLINKDue()); // safe from overflow according to above sizes return int256(balance) - int256(due); } /** * @notice number of observations oracle is due to be reimbursed for * @param _signerOrTransmitter address used by oracle for signing or transmitting reports */ function oracleObservationCount(address _signerOrTransmitter) external view returns (uint16) { Oracle memory oracle = s_oracles[_signerOrTransmitter]; if (oracle.role == Role.Unset) { return 0; } return s_oracleObservationsCounts[oracle.index] - 1; } function reimburseAndRewardOracles( uint32 initialGas, bytes memory observers ) internal { Oracle memory txOracle = s_oracles[msg.sender]; Billing memory billing = s_billing; // Reward oracles for providing observations. Oracles are not rewarded // for providing signatures, because signing is essentially free. s_oracleObservationsCounts = oracleRewards(observers, s_oracleObservationsCounts); // Reimburse transmitter of the report for gas usage require(txOracle.role == Role.Transmitter, "sent by undesignated transmitter" ); uint256 gasPrice = impliedGasPrice( tx.gasprice / (1 gwei), // convert to ETH-gwei units billing.reasonableGasPrice, billing.maximumGasPrice ); // The following is only an upper bound, as it ignores the cheaper cost for // 0 bytes. Safe from overflow, because calldata just isn't that long. uint256 callDataGasCost = 16 * msg.data.length; // If any changes are made to subsequent calculations, accountingGasCost // needs to change, too. uint256 gasLeft = gasleft(); uint256 gasCostEthWei = transmitterGasCostEthWei( uint256(initialGas), gasPrice, callDataGasCost, gasLeft ); // microLinkPerEth is 1e-6LINK/ETH units, gasCostEthWei is 1e-18ETH units // (ETH-wei), product is 1e-24LINK-wei units, dividing by 1e6 gives // 1e-18LINK units, i.e. LINK-wei units // Safe from over/underflow, since all components are non-negative, // gasCostEthWei will always fit into uint128 and microLinkPerEth is a // uint32 (128+32 < 256!). uint256 gasCostLinkWei = (gasCostEthWei * billing.microLinkPerEth)/ 1e6; // Safe from overflow, because gasCostLinkWei < 2**160 and // billing.linkGweiPerTransmission * (1 gwei) < 2**64 and we increment // s_gasReimbursementsLinkWei[txOracle.index] at most 2**40 times. s_gasReimbursementsLinkWei[txOracle.index] = s_gasReimbursementsLinkWei[txOracle.index] + gasCostLinkWei + uint256(billing.linkGweiPerTransmission) * (1 gwei); // convert from linkGwei to linkWei // Uncomment next line to compute the remaining gas cost after above gasleft(). // See OffchainAggregatorBilling.accountingGasCost docstring for more information. // // gasUsedInAccounting = gasLeft - gasleft(); } /* * Payee management */ /** * @notice emitted when a transfer of an oracle's payee address has been initiated * @param transmitter address from which the oracle sends reports to the transmit method * @param current the payeee address for the oracle, prior to this setting * @param proposed the proposed new payee address for the oracle */ event PayeeshipTransferRequested( address indexed transmitter, address indexed current, address indexed proposed ); /** * @notice emitted when a transfer of an oracle's payee address has been completed * @param transmitter address from which the oracle sends reports to the transmit method * @param current the payeee address for the oracle, prior to this setting */ event PayeeshipTransferred( address indexed transmitter, address indexed previous, address indexed current ); /** * @notice sets the payees for transmitting addresses * @param _transmitters addresses oracles use to transmit the reports * @param _payees addresses of payees corresponding to list of transmitters * @dev must be called by owner * @dev cannot be used to change payee addresses, only to initially populate them */ function setPayees( address[] calldata _transmitters, address[] calldata _payees ) external onlyOwner() { require(_transmitters.length == _payees.length, "transmitters.size != payees.size"); for (uint i = 0; i < _transmitters.length; i++) { address transmitter = _transmitters[i]; address payee = _payees[i]; address currentPayee = s_payees[transmitter]; bool zeroedOut = currentPayee == address(0); require(zeroedOut || currentPayee == payee, "payee already set"); s_payees[transmitter] = payee; if (currentPayee != payee) { emit PayeeshipTransferred(transmitter, currentPayee, payee); } } } /** * @notice first step of payeeship transfer (safe transfer pattern) * @param _transmitter transmitter address of oracle whose payee is changing * @param _proposed new payee address * @dev can only be called by payee address */ function transferPayeeship( address _transmitter, address _proposed ) external { require(msg.sender == s_payees[_transmitter], "only current payee can update"); require(msg.sender != _proposed, "cannot transfer to self"); address previousProposed = s_proposedPayees[_transmitter]; s_proposedPayees[_transmitter] = _proposed; if (previousProposed != _proposed) { emit PayeeshipTransferRequested(_transmitter, msg.sender, _proposed); } } /** * @notice second step of payeeship transfer (safe transfer pattern) * @param _transmitter transmitter address of oracle whose payee is changing * @dev can only be called by proposed new payee address */ function acceptPayeeship( address _transmitter ) external { require(msg.sender == s_proposedPayees[_transmitter], "only proposed payees can accept"); address currentPayee = s_payees[_transmitter]; s_payees[_transmitter] = msg.sender; s_proposedPayees[_transmitter] = address(0); emit PayeeshipTransferred(_transmitter, currentPayee, msg.sender); } /* * Helper functions */ function saturatingAddUint16(uint16 _x, uint16 _y) internal pure returns (uint16) { return uint16(min(uint256(_x)+uint256(_y), maxUint16)); } function min(uint256 a, uint256 b) internal pure returns (uint256) { if (a < b) { return a; } return b; } }
// SPDX-License-Identifier: MIT pragma solidity 0.7.6; /** * @title The Owned contract * @notice A contract with helpers for basic contract ownership. */ contract Owned { address payable public owner; address private pendingOwner; event OwnershipTransferRequested( address indexed from, address indexed to ); event OwnershipTransferred( address indexed from, address indexed to ); constructor() { owner = msg.sender; } /** * @dev Allows an owner to begin transferring ownership to a new address, * pending. */ function transferOwnership(address _to) external onlyOwner() { pendingOwner = _to; emit OwnershipTransferRequested(owner, _to); } /** * @dev Allows an ownership transfer to be completed by the recipient. */ function acceptOwnership() external { require(msg.sender == pendingOwner, "Must be proposed owner"); address oldOwner = owner; owner = msg.sender; pendingOwner = address(0); emit OwnershipTransferred(oldOwner, msg.sender); } /** * @dev Reverts if called by anyone other than the contract owner. */ modifier onlyOwner() { require(msg.sender == owner, "Only callable by owner"); _; } }
// SPDX-License-Identifier: MIT pragma solidity 0.7.6; import "./SimpleWriteAccessController.sol"; /** * @title SimpleReadAccessController * @notice Gives access to: * - any externally owned account (note that offchain actors can always read * any contract storage regardless of onchain access control measures, so this * does not weaken the access control while improving usability) * - accounts explicitly added to an access list * @dev SimpleReadAccessController is not suitable for access controlling writes * since it grants any externally owned account access! See * SimpleWriteAccessController for that. */ contract SimpleReadAccessController is SimpleWriteAccessController { /** * @notice Returns the access of an address * @param _user The address to query */ function hasAccess( address _user, bytes memory _calldata ) public view virtual override returns (bool) { return super.hasAccess(_user, _calldata) || _user == tx.origin; } }
// SPDX-License-Identifier: MIT pragma solidity 0.7.6; import "./Owned.sol"; import "./AccessControllerInterface.sol"; /** * @title SimpleWriteAccessController * @notice Gives access to accounts explicitly added to an access list by the * controller's owner. * @dev does not make any special permissions for externally, see * SimpleReadAccessController for that. */ contract SimpleWriteAccessController is AccessControllerInterface, Owned { bool public checkEnabled; mapping(address => bool) internal accessList; event AddedAccess(address user); event RemovedAccess(address user); event CheckAccessEnabled(); event CheckAccessDisabled(); constructor() { checkEnabled = true; } /** * @notice Returns the access of an address * @param _user The address to query */ function hasAccess( address _user, bytes memory ) public view virtual override returns (bool) { return accessList[_user] || !checkEnabled; } /** * @notice Adds an address to the access list * @param _user The address to add */ function addAccess(address _user) external onlyOwner() { addAccessInternal(_user); } function addAccessInternal(address _user) internal { if (!accessList[_user]) { accessList[_user] = true; emit AddedAccess(_user); } } /** * @notice Removes an address from the access list * @param _user The address to remove */ function removeAccess(address _user) external onlyOwner() { if (accessList[_user]) { accessList[_user] = false; emit RemovedAccess(_user); } } /** * @notice makes the access check enforced */ function enableAccessCheck() external onlyOwner() { if (!checkEnabled) { checkEnabled = true; emit CheckAccessEnabled(); } } /** * @notice makes the access check unenforced */ function disableAccessCheck() external onlyOwner() { if (checkEnabled) { checkEnabled = false; emit CheckAccessDisabled(); } } /** * @dev reverts if the caller does not have access */ modifier checkAccess() { require(hasAccess(msg.sender, msg.data), "No access"); _; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; abstract contract TypeAndVersionInterface{ function typeAndVersion() external pure virtual returns (string memory); }
{ "optimizer": { "enabled": true, "runs": 200 }, "metadata": { "bytecodeHash": "ipfs" }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "evmVersion": "istanbul", "libraries": {} }
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AggregatorValidatorInterface","name":"validator","type":"address"},{"internalType":"uint32","name":"gasLimit","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_recipient","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdrawFunds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_transmitter","type":"address"}],"name":"withdrawPayment","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000fd9e8d3af1aaee056eb9e802c3a762a667b19040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000007a1200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000ec8332de16f0f81effeec9713f46755cc42e2bbd00000000000000000000000000000000000000000000000000000000000000050000000000000000000000000000000000000000000000000000000000000180000000000000000000000000000000000000000000000000000000000000001a4254432d55534420372d446179205265616c697a656420566f6c000000000000
-----Decoded View---------------
Arg [0] : _maximumGasPrice (uint32): 0
Arg [1] : _reasonableGasPrice (uint32): 0
Arg [2] : _microLinkPerEth (uint32): 0
Arg [3] : _linkGweiPerObservation (uint32): 0
Arg [4] : _linkGweiPerTransmission (uint32): 0
Arg [5] : _link (address): 0x0Fd9e8d3aF1aaee056EB9e802c3A762a667b1904
Arg [6] : _minAnswer (int192): 0
Arg [7] : _maxAnswer (int192): 500000
Arg [8] : _billingAccessController (address): 0x0000000000000000000000000000000000000000
Arg [9] : _requesterAccessController (address): 0xec8332De16f0F81eFfeEC9713F46755CC42e2BBD
Arg [10] : _decimals (uint8): 5
Arg [11] : description (string): BTC-USD 7-Day Realized Vol
-----Encoded View---------------
14 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000fd9e8d3af1aaee056eb9e802c3a762a667b1904
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [7] : 000000000000000000000000000000000000000000000000000000000007a120
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [9] : 000000000000000000000000ec8332de16f0f81effeec9713f46755cc42e2bbd
Arg [10] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [11] : 0000000000000000000000000000000000000000000000000000000000000180
Arg [12] : 000000000000000000000000000000000000000000000000000000000000001a
Arg [13] : 4254432d55534420372d446179205265616c697a656420566f6c000000000000
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.