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APIconsumer.sol
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APIconsumer.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
import '@chainlink/contracts/src/v0.8/ChainlinkClient.sol';
import '@chainlink/contracts/src/v0.8/ConfirmedOwner.sol';
/**
* Request testnet LINK and ETH here: https://faucets.chain.link/
* Find information on LINK Token Contracts and get the latest ETH and LINK faucets here: https://docs.chain.link/docs/link-token-contracts/
*/
/**
* THIS IS AN EXAMPLE CONTRACT WHICH USES HARDCODED VALUES FOR CLARITY.
* THIS EXAMPLE USES UN-AUDITED CODE.
* DO NOT USE THIS CODE IN PRODUCTION.
*/
contract APIConsumer is ChainlinkClient, ConfirmedOwner {
using Chainlink for Chainlink.Request;
uint256 public volume;
bytes32 private jobId;
uint256 private fee;
event RequestVolume(bytes32 indexed requestId, uint256 volume);
/**
* @notice Initialize the link token and target oracle
*
* Rinkeby Testnet details:
* Link Token: 0x01BE23585060835E02B77ef475b0Cc51aA1e0709
* Oracle: 0xf3FBB7f3391F62C8fe53f89B41dFC8159EE9653f (Chainlink DevRel)
* jobId: ca98366cc7314957b8c012c72f05aeeb
*
*/
constructor() ConfirmedOwner(msg.sender) {
setChainlinkToken(0x01BE23585060835E02B77ef475b0Cc51aA1e0709);
setChainlinkOracle(0xf3FBB7f3391F62C8fe53f89B41dFC8159EE9653f);
jobId = 'ca98366cc7314957b8c012c72f05aeeb';
fee = (1 * LINK_DIVISIBILITY) / 10; // 0,1 * 10**18 (Varies by network and job)
}
/**
* Create a Chainlink request to retrieve API response, find the target
* data, then multiply by 1000000000000000000 (to remove decimal places from data).
*/
function requestVolumeData() public returns (bytes32 requestId) {
Chainlink.Request memory req = buildChainlinkRequest(jobId, address(this), this.fulfill.selector);
// Set the URL to perform the GET request on
req.add('get', 'https://min-api.cryptocompare.com/data/pricemultifull?fsyms=ETH&tsyms=USD');
// Set the path to find the desired data in the API response, where the response format is:
// {"RAW":
// {"ETH":
// {"USD":
// {
// "VOLUME24HOUR": xxx.xxx,
// }
// }
// }
// }
// request.add("path", "RAW.ETH.USD.VOLUME24HOUR"); // Chainlink nodes prior to 1.0.0 support this format
req.add('path', 'RAW,ETH,USD,VOLUME24HOUR'); // Chainlink nodes 1.0.0 and later support this format
// Multiply the result by 1000000000000000000 to remove decimals
int256 timesAmount = 10**18;
req.addInt('times', timesAmount);
// Sends the request
return sendChainlinkRequest(req, fee);
}
/**
* Receive the response in the form of uint256
*/
function fulfill(bytes32 _requestId, uint256 _volume) public recordChainlinkFulfillment(_requestId) {
emit RequestVolume(_requestId, _volume);
volume = _volume;
}
/**
* Allow withdraw of Link tokens from the contract
*/
function withdrawLink() public onlyOwner {
LinkTokenInterface link = LinkTokenInterface(chainlinkTokenAddress());
require(link.transfer(msg.sender, link.balanceOf(address(this))), 'Unable to transfer');
}
}