Start Building on the DIA Oracle and API

/**
 *Submitted for verification at Etherscan.io on 2018-10-25
*/

pragma solidity ^0.4.21;

contract DiaOracle {
  address owner;

  struct CoinInfo {
    uint256 price;
    uint256 supply;
    uint256 lastUpdateTimestamp;
    string symbol;
  }

  mapping(string => CoinInfo) diaOracles;
  
  event newCoinInfo(
    string name,
    string symbol,
    uint256 price,
    uint256 supply,
    uint256 lastUpdateTimestamp
  );
    
  constructor() public {
    owner = msg.sender;
  }

  function changeOwner(address newOwner) public {
    require(msg.sender == owner);
    owner = newOwner;
  }
    
  function updateCoinInfo(string name, string symbol, uint256 newPrice, uint256 newSupply, uint256 newTimestamp) public {
    require(msg.sender == owner);
    diaOracles[name] = (CoinInfo(newPrice, newSupply, newTimestamp, symbol));
    emit newCoinInfo(name, symbol, newPrice, newSupply, newTimestamp);
  }
    
  function getCoinInfo(string name) public view returns (uint256, uint256, uint256, string) {
    return (
      diaOracles[name].price,
      diaOracles[name].supply,
      diaOracles[name].lastUpdateTimestamp,
      diaOracles[name].symbol
    );
  }
}