这是chainlink示例代码在这里,在这段代码中我只添加了1个oracle和1个job id,但问题是如何添加2个节点(2个oracles和2个job id)以从单个URL获取响应,即2个节点必须验证进入区块链之前的 URL 数据。
编译指示 ^0.6.0;
导入“@chainlink/contracts/src/v0.6/ChainlinkClient.sol”;
合约 APIConsumer 为 ChainlinkClient { uint256 public volume;
address private oracle;
bytes32 private jobId;
uint256 private fee;
/**
* Network: Kovan
* Chainlink - 0x2f90A6D021db21e1B2A077c5a37B3C7E75D15b7e
* Chainlink - 29fa9aa13bf1468788b7cc4a500a45b8
* Fee: 0.1 LINK
*/
constructor() public {
setPublicChainlinkToken();
oracle = 0x2f90A6D021db21e1B2A077c5a37B3C7E75D15b7e;
jobId = "29fa9aa13bf1468788b7cc4a500a45b8";
fee = 0.1 * 10**18; // 0.1 LINK
}
/**
* 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 request =
buildChainlinkRequest(jobId, address(this), this.fulfill.selector);
// Set the URL to perform the GET request on
request.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:
request.add("path", "RAW.ETH.USD.VOLUME24HOUR");
// Multiply the result by 1000000000000000000 to remove decimals
int256 timesAmount = 10**18;
request.addInt("times", timesAmount);
// Sends the request
return sendChainlinkRequestTo(oracle, request, fee);
}
/**
* Receive the response in the form of uint256
*/
function fulfill(bytes32 _requestId, uint256 _volume)
public
recordChainlinkFulfillment(_requestId)
{
volume = _volume;
}
}