hunterlong / fiatcontract Goto Github PK

pragma solidity ^0.4.23;
import "./Ownable.sol";

contract MyContract is Ownable {
    uint256 private ethValue;
    uint256 private sdrValue;

    constructor() public {
        ethValue = 1;
        sdrValue = 1;
    }

    function setRatio(uint256 _ethValue, uint256 _sdrValue) external onlyOwner {
        ethValue = _ethValue;
        sdrValue = _sdrValue;
    }

    function toSdrAmount(uint256 ethAmount) external view returns (uint256) {
        return ethAmount * sdrValue / ethValue;
    }

    function toEthAmount(uint256 sdrAmount) external view returns (uint256) {
        return sdrAmount * ethValue / sdrValue;
    }
}

let fs = require("fs");
let Web3 = require("web3");
let request = require("request");
let BigNumber = require("bignumber.js");

let ETH_NODE_ADDRESS  = process.argv[2];
let OWNER_PUBLIC_KEY  = process.argv[3];
let OWNER_PRIVATE_KEY = process.argv[4];
let CONTRACT_ADDRESS  = process.argv[5];

async function updatePrice(rates) {
    web3 = new Web3(ETH_NODE_ADDRESS);

    let abi = fs.readFileSync("MyContract.abi").toString();
    let contract = new web3.eth.Contract(JSON.parse(abi), CONTRACT_ADDRESS);

    let floatPrice = rates.USD * 0.4173 + rates.EUR * 0.3093 + rates.CNY * 0.1092 + rates.JPY * 0.0833 + rates.GBP * 0.0809;
    let [sdrValue, ethValue] = new BigNumber(floatPrice).toFraction();
    let transaction = contract.methods.setRatio(ethValue, sdrValue);

    let options = {
        to  : transaction._parent._address,
        data: transaction.encodeABI(),
        gas : await transaction.estimateGas({from: OWNER_PUBLIC_KEY}),
    };

    let signedTransaction = await web3.eth.accounts.signTransaction(options, OWNER_PRIVATE_KEY);
    let transactionReceipt = await web3.eth.sendSignedTransaction(signedTransaction.rawTransaction);
    let fixedPrice = await contract.methods.toSdrAmount(1).call();

    console.log(`\nrates = ${JSON.stringify(rates, null, 4)}`);
    console.log(`floatPrice: 1 ETH = ${floatPrice} SDR`);
    console.log(`fixedPrice: 1 ETH = ${fixedPrice} SDR`);

    if (web3.currentProvider.constructor.name == "WebsocketProvider")
        web3.currentProvider.connection.close();
}

request.get("https://min-api.cryptocompare.com/data/price?fsym=ETH&tsyms=USD,EUR,CNY,JPY,GBP", function (error, response, body) {
    if (error)
        console.log("error:", error);
    else if (!response)
        console.log("no response");
    else if (response.statusCode != 200)
        console.log("bad response");
    else
        updatePrice(JSON.parse(body));
});

"bignumber.js": "^7.0.0"
"web3": "1.0.0-beta.34"