Contract Name:
InstaDydxFlashLoan
Contract Source Code:
File 1 of 1 : InstaDydxFlashLoan
pragma solidity ^0.6.6;
pragma experimental ABIEncoderV2;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
function deposit() external payable;
function withdraw(uint256 amount) external;
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly { codehash := extcodehash(account) }
return (codehash != accountHash && codehash != 0x0);
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call.value(amount)("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return _functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call.value(weiValue)(data);
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
contract DSMath {
uint constant WAD = 10 ** 18;
uint constant RAY = 10 ** 27;
function add(uint x, uint y) internal pure returns (uint z) {
z = SafeMath.add(x, y);
}
function sub(uint x, uint y) internal virtual pure returns (uint z) {
z = SafeMath.sub(x, y);
}
function mul(uint x, uint y) internal pure returns (uint z) {
z = SafeMath.mul(x, y);
}
function div(uint x, uint y) internal pure returns (uint z) {
z = SafeMath.div(x, y);
}
function wmul(uint x, uint y) internal pure returns (uint z) {
z = SafeMath.add(SafeMath.mul(x, y), WAD / 2) / WAD;
}
function wdiv(uint x, uint y) internal pure returns (uint z) {
z = SafeMath.add(SafeMath.mul(x, WAD), y / 2) / y;
}
function rdiv(uint x, uint y) internal pure returns (uint z) {
z = SafeMath.add(SafeMath.mul(x, RAY), y / 2) / y;
}
function rmul(uint x, uint y) internal pure returns (uint z) {
z = SafeMath.add(SafeMath.mul(x, y), RAY / 2) / RAY;
}
}
interface Account {
struct Info {
address owner; // The address that owns the account
uint256 number; // A nonce that allows a single address to control many accounts
}
}
interface Actions {
enum ActionType {
Deposit, // supply tokens
Withdraw, // borrow tokens
Transfer, // transfer balance between accounts
Buy, // buy an amount of some token (publicly)
Sell, // sell an amount of some token (publicly)
Trade, // trade tokens against another account
Liquidate, // liquidate an undercollateralized or expiring account
Vaporize, // use excess tokens to zero-out a completely negative account
Call // send arbitrary data to an address
}
struct ActionArgs {
ActionType actionType;
uint256 accountId;
Types.AssetAmount amount;
uint256 primaryMarketId;
uint256 secondaryMarketId;
address otherAddress;
uint256 otherAccountId;
bytes data;
}
struct DepositArgs {
Types.AssetAmount amount;
Account.Info account;
uint256 market;
address from;
}
struct WithdrawArgs {
Types.AssetAmount amount;
Account.Info account;
uint256 market;
address to;
}
struct CallArgs {
Account.Info account;
address callee;
bytes data;
}
}
interface Types {
enum AssetDenomination {
Wei, // the amount is denominated in wei
Par // the amount is denominated in par
}
enum AssetReference {
Delta, // the amount is given as a delta from the current value
Target // the amount is given as an exact number to end up at
}
struct AssetAmount {
bool sign; // true if positive
AssetDenomination denomination;
AssetReference ref;
uint256 value;
}
struct Wei {
bool sign; // true if positive
uint256 value;
}
}
interface ISoloMargin {
struct OperatorArg {
address operator;
bool trusted;
}
function getMarketTokenAddress(uint256 marketId)
external
view
returns (address);
function getNumMarkets() external view returns (uint256);
function operate(
Account.Info[] calldata accounts,
Actions.ActionArgs[] calldata actions
) external;
function getAccountWei(Account.Info calldata account, uint256 marketId)
external
view
returns (Types.Wei memory);
}
contract DydxFlashloanBase {
function _getMarketIdFromTokenAddress(address _solo, address token)
internal
view
returns (uint256)
{
ISoloMargin solo = ISoloMargin(_solo);
uint256 numMarkets = solo.getNumMarkets();
address curToken;
for (uint256 i = 0; i < numMarkets; i++) {
curToken = solo.getMarketTokenAddress(i);
if (curToken == token) {
return i;
}
}
revert("No marketId found for provided token");
}
function _getAccountInfo() internal view returns (Account.Info memory) {
return Account.Info({owner: address(this), number: 1});
}
function _getWithdrawAction(uint marketId, uint256 amount)
internal
view
returns (Actions.ActionArgs memory)
{
return
Actions.ActionArgs({
actionType: Actions.ActionType.Withdraw,
accountId: 0,
amount: Types.AssetAmount({
sign: false,
denomination: Types.AssetDenomination.Wei,
ref: Types.AssetReference.Delta,
value: amount
}),
primaryMarketId: marketId,
secondaryMarketId: 0,
otherAddress: address(this),
otherAccountId: 0,
data: ""
});
}
function _getCallAction(bytes memory data)
internal
view
returns (Actions.ActionArgs memory)
{
return
Actions.ActionArgs({
actionType: Actions.ActionType.Call,
accountId: 0,
amount: Types.AssetAmount({
sign: false,
denomination: Types.AssetDenomination.Wei,
ref: Types.AssetReference.Delta,
value: 0
}),
primaryMarketId: 0,
secondaryMarketId: 0,
otherAddress: address(this),
otherAccountId: 0,
data: data
});
}
function _getDepositAction(uint marketId, uint256 amount)
internal
view
returns (Actions.ActionArgs memory)
{
return
Actions.ActionArgs({
actionType: Actions.ActionType.Deposit,
accountId: 0,
amount: Types.AssetAmount({
sign: true,
denomination: Types.AssetDenomination.Wei,
ref: Types.AssetReference.Delta,
value: amount
}),
primaryMarketId: marketId,
secondaryMarketId: 0,
otherAddress: address(this),
otherAccountId: 0,
data: ""
});
}
}
/**
* @title ICallee
* @author dYdX
*
* Interface that Callees for Solo must implement in order to ingest data.
*/
interface ICallee {
// ============ Public Functions ============
/**
* Allows users to send this contract arbitrary data.
*
* @param sender The msg.sender to Solo
* @param accountInfo The account from which the data is being sent
* @param data Arbitrary data given by the sender
*/
function callFunction(
address sender,
Account.Info calldata accountInfo,
bytes calldata data
)
external;
}
interface DSAInterface {
function cast(address[] calldata _targets, bytes[] calldata _datas, address _origin) external payable;
}
interface IndexInterface {
function master() external view returns (address);
}
interface TokenInterface {
function approve(address, uint256) external;
function transfer(address, uint) external;
function transferFrom(address, address, uint) external;
function deposit() external payable;
function withdraw(uint) external;
function balanceOf(address) external view returns (uint);
function decimals() external view returns (uint);
}
interface ListInterface {
function accountID(address) external view returns (uint64);
}
contract Setup {
IndexInterface public constant instaIndex = IndexInterface(0x2971AdFa57b20E5a416aE5a708A8655A9c74f723);
ListInterface public constant instaList = ListInterface(0x4c8a1BEb8a87765788946D6B19C6C6355194AbEb);
address public constant soloAddr = 0x1E0447b19BB6EcFdAe1e4AE1694b0C3659614e4e;
address public constant wethAddr = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
address public constant ethAddr = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
TokenInterface wethContract = TokenInterface(wethAddr);
ISoloMargin solo = ISoloMargin(soloAddr);
address public makerConnect = address(0x33c4f6d6c0A123AF5F1655EA5Fd730098d0aBD50);
address public compoundConnect = address(0x33d4876A16F712f1a305C5594A5AdeDc9b7A9f14);
address public aaveConnect = address(0x01d0734e34B0251f46aD34d1a82c4946a5B943D9);
uint public vaultId;
uint public fee; // Fee in percent
modifier isMaster() {
require(msg.sender == instaIndex.master(), "not-master");
_;
}
/**
* FOR SECURITY PURPOSE
* only Smart DEFI Account can access the liquidity pool contract
*/
modifier isDSA {
uint64 id = instaList.accountID(msg.sender);
require(id != 0, "not-dsa-id");
_;
}
struct CastData {
address dsa;
uint route;
address[] tokens;
uint[] amounts;
address[] dsaTargets;
bytes[] dsaData;
}
}
contract Helper is Setup {
event LogChangedFee(uint newFee);
function encodeDsaCastData(
address dsa,
uint route,
address[] memory tokens,
uint[] memory amounts,
bytes memory data
) internal pure returns (bytes memory _data) {
CastData memory cd;
(cd.dsaTargets, cd.dsaData) = abi.decode(
data,
(address[], bytes[])
);
_data = abi.encode(dsa, route, tokens, amounts, cd.dsaTargets, cd.dsaData);
}
function spell(address _target, bytes memory _data) internal {
require(_target != address(0), "target-invalid");
assembly {
let succeeded := delegatecall(gas(), _target, add(_data, 0x20), mload(_data), 0, 0)
switch iszero(succeeded)
case 1 {
let size := returndatasize()
returndatacopy(0x00, 0x00, size)
revert(0x00, size)
}
}
}
function updateFee(uint _fee) public isMaster {
require(_fee != fee, "same-fee");
require(_fee < 10 ** 15, "more-than-max-fee");
fee = _fee;
emit LogChangedFee(_fee);
}
function masterSpell(address _target, bytes calldata _data) external isMaster {
spell(_target, _data);
}
}
contract Resolver is Helper {
function selectBorrow(address[] memory tokens, uint[] memory amts, uint route) internal {
if (route == 0) {
return;
} else if (route == 1) {
bytes memory _dataOne = abi.encodeWithSignature("deposit(uint256,uint256)", vaultId, uint(-1));
bytes memory _dataTwo = abi.encodeWithSignature("borrow(uint256,uint256)", vaultId, amts[0]);
spell(makerConnect, _dataOne);
spell(makerConnect, _dataTwo);
} else if (route == 2) {
bytes memory _dataOne = abi.encodeWithSignature("deposit(address,uint256)", ethAddr, uint(-1));
spell(compoundConnect, _dataOne);
for (uint i = 0; i < amts.length; i++) {
bytes memory _dataTwo = abi.encodeWithSignature("borrow(address,uint256)", tokens[i], amts[i]);
spell(compoundConnect, _dataTwo);
}
} else if (route == 3) {
bytes memory _dataOne = abi.encodeWithSignature("deposit(address,uint256)", ethAddr, uint(-1));
spell(aaveConnect, _dataOne);
for (uint i = 0; i < amts.length; i++) {
bytes memory _dataTwo = abi.encodeWithSignature("borrow(address,uint256)", tokens[i], amts[i]);
spell(aaveConnect, _dataTwo);
}
} else {
revert("route-not-found");
}
}
function selectPayback(address[] memory tokens, uint route) internal {
if (route == 0) {
return;
} else if (route == 1) {
bytes memory _dataOne = abi.encodeWithSignature("payback(uint256,uint256)", vaultId, uint(-1));
bytes memory _dataTwo = abi.encodeWithSignature("withdraw(uint256,uint256)", vaultId, uint(-1));
spell(makerConnect, _dataOne);
spell(makerConnect, _dataTwo);
} else if (route == 2) {
for (uint i = 0; i < tokens.length; i++) {
bytes memory _data = abi.encodeWithSignature("payback(address,uint256)", tokens[i], uint(-1));
spell(compoundConnect, _data);
}
bytes memory _dataOne = abi.encodeWithSignature("withdraw(address,uint256)", ethAddr, uint(-1));
spell(compoundConnect, _dataOne);
} else if (route == 3) {
for (uint i = 0; i < tokens.length; i++) {
bytes memory _data = abi.encodeWithSignature("payback(address,uint256)", tokens[i], uint(-1));
spell(aaveConnect, _data);
}
bytes memory _dataOne = abi.encodeWithSignature("withdraw(address,uint256)", ethAddr, uint(-1));
spell(aaveConnect, _dataOne);
} else {
revert("route-not-found");
}
}
}
contract DydxFlashloaner is Resolver, ICallee, DydxFlashloanBase, DSMath {
using SafeERC20 for IERC20;
event LogFlashLoan(
address indexed sender,
address[] tokens,
uint[] amounts,
uint[] feeAmts,
uint route
);
function checkWeth(address[] memory tokens, uint _route) internal pure returns (bool) {
if (_route == 0) {
for (uint i = 0; i < tokens.length; i++) {
if (tokens[i] == ethAddr) {
return true;
}
}
} else {
return true;
}
return false;
}
function callFunction(
address sender,
Account.Info memory account,
bytes memory data
) public override {
require(sender == address(this), "not-same-sender");
require(msg.sender == soloAddr, "not-solo-dydx-sender");
CastData memory cd;
(cd.dsa, cd.route, cd.tokens, cd.amounts, cd.dsaTargets, cd.dsaData) = abi.decode(
data,
(address, uint256, address[], uint256[], address[], bytes[])
);
bool isWeth = checkWeth(cd.tokens, cd.route);
if (isWeth) {
wethContract.withdraw(wethContract.balanceOf(address(this)));
}
selectBorrow(cd.tokens, cd.amounts, cd.route);
uint _length = cd.tokens.length;
for (uint i = 0; i < _length; i++) {
if (cd.tokens[i] == ethAddr) {
payable(cd.dsa).transfer(cd.amounts[i]);
} else {
IERC20(cd.tokens[i]).safeTransfer(cd.dsa, cd.amounts[i]);
}
}
DSAInterface(cd.dsa).cast(cd.dsaTargets, cd.dsaData, 0xB7fA44c2E964B6EB24893f7082Ecc08c8d0c0F87);
selectPayback(cd.tokens, cd.route);
if (isWeth) {
wethContract.deposit{value: address(this).balance}();
}
}
function routeDydx(address[] memory _tokens, uint256[] memory _amounts, uint _route, bytes memory data) internal {
uint _length = _tokens.length;
IERC20[] memory _tokenContracts = new IERC20[](_length);
uint[] memory _marketIds = new uint[](_length);
for (uint i = 0; i < _length; i++) {
address _token = _tokens[i] == ethAddr ? wethAddr : _tokens[i];
_marketIds[i] = _getMarketIdFromTokenAddress(soloAddr, _token);
_tokenContracts[i] = IERC20(_token);
_tokenContracts[i].approve(soloAddr, _amounts[i] + 2); // TODO - give infinity allowance??
}
uint _opLength = _length * 2 + 1;
Actions.ActionArgs[] memory operations = new Actions.ActionArgs[](_opLength);
for (uint i = 0; i < _length; i++) {
operations[i] = _getWithdrawAction(_marketIds[i], _amounts[i]);
}
operations[_length] = _getCallAction(encodeDsaCastData(msg.sender, _route, _tokens, _amounts, data));
for (uint i = 0; i < _length; i++) {
uint _opIndex = _length + 1 + i;
operations[_opIndex] = _getDepositAction(_marketIds[i], _amounts[i] + 2);
}
Account.Info[] memory accountInfos = new Account.Info[](1);
accountInfos[0] = _getAccountInfo();
uint[] memory iniBals = new uint[](_length);
uint[] memory finBals = new uint[](_length);
uint[] memory _feeAmts = new uint[](_length);
for (uint i = 0; i < _length; i++) {
iniBals[i] = _tokenContracts[i].balanceOf(address(this));
}
solo.operate(accountInfos, operations);
for (uint i = 0; i < _length; i++) {
finBals[i] = _tokenContracts[i].balanceOf(address(this));
if (fee == 0) {
_feeAmts[i] = 0;
require(sub(iniBals[i], finBals[i]) < 10000, "amount-paid-less");
} else {
uint _feeLowerLimit = wmul(_amounts[i], wmul(fee, 999500000000000000)); // removing 0.05% fee for decimal/dust error
uint _feeUpperLimit = wmul(_amounts[i], wmul(fee, 1000500000000000000)); // adding 0.05% fee for decimal/dust error
require(finBals[i] >= iniBals[i], "final-balance-less-than-inital-balance");
_feeAmts[i] = sub(finBals[i], iniBals[i]);
require(_feeLowerLimit < _feeAmts[i] && _feeAmts[i] < _feeUpperLimit, "amount-paid-less");
}
}
emit LogFlashLoan(
msg.sender,
_tokens,
_amounts,
_feeAmts,
_route
);
}
function routeProtocols(address[] memory _tokens, uint256[] memory _amounts, uint _route, bytes memory data) internal {
uint _length = _tokens.length;
uint256 wethMarketId = 0;
uint _amount = wethContract.balanceOf(soloAddr); // CHECK9898 - does solo has all the ETH?
_amount = wmul(_amount, 999000000000000000); // 99.9% weth borrow
wethContract.approve(soloAddr, _amount + 2);
Actions.ActionArgs[] memory operations = new Actions.ActionArgs[](3);
operations[0] = _getWithdrawAction(wethMarketId, _amount);
operations[1] = _getCallAction(encodeDsaCastData(msg.sender, _route, _tokens, _amounts, data));
operations[2] = _getDepositAction(wethMarketId, _amount + 2);
Account.Info[] memory accountInfos = new Account.Info[](1);
accountInfos[0] = _getAccountInfo();
uint[] memory iniBals = new uint[](_length);
uint[] memory finBals = new uint[](_length);
uint[] memory _feeAmts = new uint[](_length);
IERC20[] memory _tokenContracts = new IERC20[](_length);
for (uint i = 0; i < _length; i++) {
address _token = _tokens[i] == ethAddr ? wethAddr : _tokens[i];
_tokenContracts[i] = IERC20(_token);
iniBals[i] = _tokenContracts[i].balanceOf(address(this));
}
solo.operate(accountInfos, operations);
for (uint i = 0; i < _length; i++) {
finBals[i] = _tokenContracts[i].balanceOf(address(this));
if (fee == 0) {
_feeAmts[i] = 0;
uint _dif = wmul(_amounts[i], 200000000000); // Taking margin of 0.0000002%.
require(sub(iniBals[i], finBals[i]) < _dif, "amount-paid-less");
} else {
uint _feeLowerLimit = wmul(_amounts[i], wmul(fee, 999500000000000000)); // removing 0.05% fee for decimal/dust error
uint _feeUpperLimit = wmul(_amounts[i], wmul(fee, 1000500000000000000)); // adding 0.05% fee for decimal/dust error
require(finBals[i] >= iniBals[i], "final-balance-less-than-inital-balance");
_feeAmts[i] = sub(finBals[i], iniBals[i]);
require(_feeLowerLimit < _feeAmts[i] && _feeAmts[i] < _feeUpperLimit, "amount-paid-less");
}
}
emit LogFlashLoan(
msg.sender,
_tokens,
_amounts,
_feeAmts,
_route
);
}
function initiateFlashLoan(
address[] calldata _tokens,
uint256[] calldata _amounts,
uint _route,
bytes calldata data
) external isDSA {
if (_route == 0) {
routeDydx(_tokens, _amounts, _route, data);
} else {
routeProtocols(_tokens, _amounts, _route, data);
}
}
}
contract InstaDydxFlashLoan is DydxFlashloaner {
constructor(
uint _vaultId
) public {
wethContract.approve(wethAddr, uint(-1));
vaultId = _vaultId;
fee = 5 * 10 ** 14;
}
receive() external payable {}
}