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