如何在chainlink智能合约中添加2个节点

Question

这是chainlink示例代码。在这段代码中，我只添加了1个oracle和1个作业id，但问题是如何添加2个节点(2个oracle和2个作业id(来从单个URL获得响应，即2个节点在进入区块链之前必须验证URL数据。

实用主义稳固性^0.6.0；

导入"@chainlink/contents/src/v0.6/ChainlinkClient.sol"；；

合同APIConsumer是ChainlinkClient{uint256公共卷；

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;
}

}

Answer 1

您可以将oracle和jobId参数添加到requestVolumeData函数中，然后调用它两次，每次都传入不同的jobId和oracle。

uint[2] storage responses;   
function requestVolumeData(bytes32 _jobId, address _oracle) 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);
}

然后，在您的履行函数中，您可以将结果存储在数组或其他数据结构中，这样第二个响应就不会覆盖第一个响应。或者每个响应有一个变量，并有逻辑来检查要填充哪一个(如果两者都为空，则先填充，否则填充第二个，等等(。在该功能中，您还可以检查是否达到了最小响应量，如果达到，则对响应进行验证

function fulfill(bytes32 _requestId, uint256 _volume)
public recordChainlinkFulfillment(_requestId)
{
responses.push(_volume)
if responses.length > some number {
//do something with the responses
}
}