CoinGeckoConsumer.sol

CoinGeckoConsumer.sol

// This example code is designed to quickly deploy an example contract using Remix.
 
pragma solidity ^0.6.0;

import "https://github.com/smartcontractkit/chainlink/evm-contracts/src/v0.6/ChainlinkClient.sol";

contract CoinGeckoConsumer is ChainlinkClient {
    address private oracle;
    bytes32 private jobId;
    uint256 private fee;
    
    uint256 public ethereumPrice;
    
    /**
     * Network: Kovan
     * Oracle: 
     *      Name:           AlphaChain Kovan
     *      Listing URL:    https://market.link/nodes/ef076e87-49f4-486b-9878-c4806781c7a0?start=1601380594&end=1601985394
     *      Address:        0xAA1DC356dc4B18f30C347798FD5379F3D77ABC5b
     * Job: 
     *      Name:           ETH-USD CoinGecko
     *      Listing URL:    https://market.link/jobs/78868caf-4a75-4dbf-a4cf-52538a283409
     *      ID:             9cc0c77e8e6e4f348ef5ba03c636f1f7
     *      Fee:            0.1 LINK
     */
    constructor() public {
    	setPublicChainlinkToken();
    	oracle = 0xAA1DC356dc4B18f30C347798FD5379F3D77ABC5b; // oracle address
    	jobId = "9cc0c77e8e6e4f348ef5ba03c636f1f7"; //job id
    	fee = 0.1 * 10 ** 18; // 0.1 LINK
    }
    
    /**
     * Make initial request
     */
    function requestEthereumPrice() public {
    	Chainlink.Request memory req = buildChainlinkRequest(jobId, address(this), this.fulfillEthereumPrice.selector);
    	sendChainlinkRequestTo(oracle, req, fee);
    }
    
    /**
     * Callback function
     */
    function fulfillEthereumPrice(bytes32 _requestId, uint256 _price) public recordChainlinkFulfillment(_requestId) {
    	ethereumPrice = _price;
    }
    
    /**
     * Withdraw LINK from this contract
     * 
     * NOTE: DO NOT USE THIS IN PRODUCTION AS IT CAN BE CALLED BY ANY ADDRESS.
     * THIS IS PURELY FOR EXAMPLE PURPOSES ONLY.
     */
    function withdrawLink() external {
        LinkTokenInterface linkToken = LinkTokenInterface(chainlinkTokenAddress());
        require(linkToken.transfer(msg.sender, linkToken.balanceOf(address(this))), "Unable to transfer");
    }
}