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March 1, 2023 07:22
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Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.18+commit.87f61d96.js&optimize=false&runs=200&gist=
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| // SPDX-License-Identifier: None | |
| pragma solidity ^0.8.0; | |
| contract EntropyProvider { | |
| bytes entropy; | |
| uint last_update; | |
| address processor; | |
| constructor(address _processor) { | |
| processor = _processor; | |
| } | |
| /** | |
| * Receive entropy (random bytes) from an Acurast job. | |
| */ | |
| function receive_entropy(bytes memory _entropy) public { | |
| // Ensures that only the processor can call this function | |
| require(msg.sender == processor, "NOT_ALLOWED"); | |
| // Update entropy | |
| entropy = _entropy; | |
| last_update = block.timestamp; | |
| } | |
| /** | |
| * A view that exposes the entropy to other contracts. | |
| */ | |
| function consume_entropy(uint maxAge) public view returns (bytes memory) { | |
| // Consumers can specify the maximum entropy age they are willing to accept | |
| require(block.timestamp - last_update <= maxAge, "ENTROPY_TOO_OLD"); | |
| return entropy; | |
| } | |
| } |
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