📃WitnetRandomnessRequestConsumer

🧙Solidity Wizard

Constructor

Parameters	Type	Description
_witnetOracle	WitnetOracle	Address of the WitnetOracle instance to interact with.
_baseFeeOverheadPercentage	uint16	Percentage over base fee to pay when querying new data updates.
_callbackGasLimit	uint24	Maximum gas expected to be spent by the callback methods.

Modifiers

Modifier	Description
onlyFromWitnet	To be added on callback methods for attending query results from the Wit/Oracle.
witnetQuerySolved(uint256 queryId)	Provides a convenient way for consuming contracts to block execution of the contract's logic until a particular randomness query gets ultimately reported from the Wit/Oracle blockchain.

Properties

Name	Visibility	Description
__witnet	Immutable internal	Address of the WitnetOracle instance to directly interact with.
__witnetBaseFeeOverheadPercentage	Internal	Percentage over base fee to pay when querying new data updates. Defaults to 33%.
__witnetCallbackGasLimit	Internal	Maximum gas expected to be spent by the callback methods.
__witnetDefaultSLA	Internal	Default Service Level Agreement parameters to be fulfilled by the Wit/Oracle blockchain when solving data updates.
__witnetRequestRadHash	Immutable internal	Immutable RAD hash identifying the actual sources and computations being solved by the Wit/Oracle upon every data update.

Internal methods

Methods	Description
_witnetCheckQueryResultAvailability(uint256)	Check if the specified query was already reported back from the Wit/Oracle blockchain.
_witnetEstimateEvmReward()	Estimate the minimum reward required for posting a data request, using tx.gasprice as a reference.
_witnetCheckQueryResponseStatus(uint256)	Check current WitnetV2.ResponseStatus of the specified query.
_witnetCheckQueryResultError(uint256)	Get detailed Witnet.ResultError for the specified query.
_witnetRandomUniformUint32(u32,u256,b32)	O(1) uniform random generator based on given range, nonce and seed.
__witnetReadRandomizeFromResultValue(CBOR)	Extract a bytes32 value from some Radon Result as reported from the Wit/Oracle blockchain.
__witnetRandomize(uint256 _evmReward)	Post a randomize query in expectation that it will get eventually solved and reported from the Wit/Oracle blockchain, specifying how much fee to pay out from this contract's balance.
__witnetRandomize(uint256, RadonSLA)	Post a randomize query in expectation that it will get eventually solved and reported, specifying how much fee to pay and the SLA parameters to be fulfilled by the Wit/Oracle blockchain.

Events

Events	Arguments	Description
WitnetQuery	address evmRequester uint256 evmGasPrice uint256 evmReward uint256 queryId bytes32 queryRadHash RadonSLA querySLA	Emitted every time a new randomize query gets posted to the WitnetOracle contract.
WitnetQueryUpgrade	uint256 queryId address evmSender uint256 evmGasPrice uint256 evmReward	Emitted if the EVM reward for solving a previously posted randomize is increased by anyone in any amount.