Created
June 17, 2019 02:20
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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-v0.4.21+commit.dfe3193c.js&optimize=false&gist=
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| pragma solidity ^0.4.21; | |
| contract CovoirOracle { | |
| function query(bytes _query) external returns (uint256 id); | |
| } | |
| contract CovoirLookup { | |
| function getQueryAddress() constant public returns (address); | |
| function getResponseAddress() constant public returns (address); | |
| } | |
| contract usingCovoirOracle { | |
| address constant lookupContract = 0x6a6d85aa8a9c7e7d9bbaf25053c8f9a5dd616d3c; | |
| modifier fromCovoirOracle() { | |
| CovoirLookup lookup = CovoirLookup(lookupContract); | |
| if (msg.sender != lookup.getResponseAddress()) | |
| revert(); | |
| _; | |
| } | |
| function queryCovoirOracle(bytes query) internal returns (uint256 id) { | |
| CovoirLookup lookup = CovoirLookup(lookupContract); | |
| CovoirOracle covoirOracle = CovoirOracle(lookup.getQueryAddress()); | |
| return covoirOracle.query(query); | |
| } | |
| } |
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| pragma solidity ^0.4.21; | |
| import "./api_covoir.sol"; | |
| contract SampleClient is usingCovoirOracle { | |
| bytes public response; | |
| uint256 public id_response; | |
| event resultEvent(uint256 id, bytes responseIpfs); | |
| function _oracleCallback(uint256 id, bytes _response) fromCovoirOracle external { | |
| response = _response; | |
| id_response = id; | |
| resultEvent(id_response, responseIpfs); | |
| } | |
| function queryExample(string queryIpfs) public { | |
| //IPFS Hash | |
| queryCovoirOracle(bytes(queryIpfs)); | |
| } | |
| } |
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