dsa-connectors/contracts/connectors/makerdao/helpers.sol

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2021-02-13 12:07:32 +00:00
pragma solidity ^0.7.0;
import { DSMath } from "../../common/math.sol";
import { Basic } from "../../common/basic.sol";
import { TokenInterface } from "../../common/interfaces.sol";
import { ManagerLike, DaiJoinInterface, PotLike, VatLike, JugLike } from "./interface.sol";
abstract contract Helpers is DSMath, Basic {
/**
* @dev Manager Interface
*/
ManagerLike internal constant managerContract = ManagerLike(0x5ef30b9986345249bc32d8928B7ee64DE9435E39);
/**
* @dev DAI Join
*/
DaiJoinInterface internal constant daiJoinContract = DaiJoinInterface(0x9759A6Ac90977b93B58547b4A71c78317f391A28);
/**
* @dev Pot
*/
PotLike internal constant potContract = PotLike(0x197E90f9FAD81970bA7976f33CbD77088E5D7cf7);
/**
* @dev Maker MCD Jug Address.
*/
JugLike internal constant mcdJug = JugLike(0x19c0976f590D67707E62397C87829d896Dc0f1F1);
/**
* @dev Return Close Vault Address.
*/
address internal constant giveAddr = 0x4dD58550eb15190a5B3DfAE28BB14EeC181fC267;
/**
* @dev Get Vault's ilk.
*/
function getVaultData(uint vault) internal view returns (bytes32 ilk, address urn) {
ilk = managerContract.ilks(vault);
urn = managerContract.urns(vault);
}
/**
* @dev Gem Join address is ETH type collateral.
*/
function isEth(address tknAddr) internal pure returns (bool) {
return tknAddr == ethAddr ? true : false;
}
/**
* @dev Get Vault Debt Amount.
*/
function _getVaultDebt(
address vat,
bytes32 ilk,
address urn
) internal view returns (uint wad) {
(, uint rate,,,) = VatLike(vat).ilks(ilk);
(, uint art) = VatLike(vat).urns(ilk, urn);
uint dai = VatLike(vat).dai(urn);
uint rad = sub(mul(art, rate), dai);
wad = rad / RAY;
wad = mul(wad, RAY) < rad ? wad + 1 : wad;
}
/**
* @dev Get Borrow Amount.
*/
function _getBorrowAmt(
address vat,
address urn,
bytes32 ilk,
uint amt
) internal returns (int dart)
{
uint rate = mcdJug.drip(ilk);
uint dai = VatLike(vat).dai(urn);
if (dai < mul(amt, RAY)) {
dart = toInt(sub(mul(amt, RAY), dai) / rate);
dart = mul(uint(dart), rate) < mul(amt, RAY) ? dart + 1 : dart;
}
}
/**
* @dev Get Payback Amount.
*/
function _getWipeAmt(
address vat,
uint amt,
address urn,
bytes32 ilk
) internal view returns (int dart)
{
(, uint rate,,,) = VatLike(vat).ilks(ilk);
(, uint art) = VatLike(vat).urns(ilk, urn);
dart = toInt(amt / rate);
dart = uint(dart) <= art ? - dart : - toInt(art);
}
/**
* @dev Convert String to bytes32.
*/
function stringToBytes32(string memory str) internal pure returns (bytes32 result) {
require(bytes(str).length != 0, "string-empty");
// solium-disable-next-line security/no-inline-assembly
assembly {
result := mload(add(str, 32))
}
}
/**
* @dev Get vault ID. If `vault` is 0, get last opened vault.
*/
function getVault(uint vault) internal view returns (uint _vault) {
if (vault == 0) {
require(managerContract.count(address(this)) > 0, "no-vault-opened");
_vault = managerContract.last(address(this));
} else {
_vault = vault;
}
}
}