BlockHashRNG
Inherits: RNG
Author: Clément Lesaege - clement@lesaege.com
Random Number Generator returning the blockhash with a fallback behaviour. In case no one called it within the 256 blocks, it returns the previous blockhash. This contract must be used when returning 0 is a worse failure mode than returning another blockhash. Allows saving the random number for use in the future. It allows the contract to still access the blockhash even after 256 blocks.*
State Variables
randomNumbers
mapping(uint256 => uint256) public randomNumbers;
Functions
requestRandomness
Request a random number.
function requestRandomness(uint256 _block) external override;
Parameters
| Name | Type | Description |
|---|---|---|
_block | uint256 | Block the random number is linked to. |
receiveRandomness
Return the random number. If it has not been saved and is still computable compute it.
function receiveRandomness(uint256 _block) external override returns (uint256 randomNumber);
Parameters
| Name | Type | Description |
|---|---|---|
_block | uint256 | Block the random number is linked to. |
Returns
| Name | Type | Description |
|---|---|---|
randomNumber | uint256 | The random number or 0 if it is not ready or has not been requested. |