Contract Source Code:
File 1 of 1 : Eclipseum
// File: node_modules\openzeppelin-solidity\contracts\GSN\Context.sol
pragma solidity ^0.5.0;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
contract Context {
// Empty internal constructor, to prevent people from mistakenly deploying
// an instance of this contract, which should be used via inheritance.
constructor () internal { }
// solhint-disable-previous-line no-empty-blocks
function _msgSender() internal view returns (address payable) {
return msg.sender;
}
function _msgData() internal view returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// File: node_modules\openzeppelin-solidity\contracts\token\ERC20\IERC20.sol
pragma solidity ^0.5.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* the optional functions; to access them see {ERC20Detailed}.
*/
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);
/**
* @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);
}
// File: node_modules\openzeppelin-solidity\contracts\math\SafeMath.sol
pragma solidity ^0.5.0;
/**
* @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.
*
* _Available since v2.4.0._
*/
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.
*
* _Available since v2.4.0._
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
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.
*
* _Available since v2.4.0._
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// File: node_modules\openzeppelin-solidity\contracts\token\ERC20\ERC20.sol
pragma solidity ^0.5.0;
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20Mintable}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20};
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for `sender`'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal {
require(account != address(0), "ERC20: burn from the zero address");
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
*
* This is internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 amount) internal {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Destroys `amount` tokens from `account`.`amount` is then deducted
* from the caller's allowance.
*
* See {_burn} and {_approve}.
*/
function _burnFrom(address account, uint256 amount) internal {
_burn(account, amount);
_approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
}
}
// File: node_modules\openzeppelin-solidity\contracts\token\ERC20\ERC20Detailed.sol
pragma solidity ^0.5.0;
/**
* @dev Optional functions from the ERC20 standard.
*/
contract ERC20Detailed is IERC20 {
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
* these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name, string memory symbol, uint8 decimals) public {
_name = name;
_symbol = symbol;
_decimals = decimals;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view returns (uint8) {
return _decimals;
}
}
// File: node_modules\openzeppelin-solidity\contracts\utils\ReentrancyGuard.sol
pragma solidity ^0.5.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*
* _Since v2.5.0:_ this module is now much more gas efficient, given net gas
* metering changes introduced in the Istanbul hardfork.
*/
contract ReentrancyGuard {
bool private _notEntered;
constructor () internal {
// Storing an initial non-zero value makes deployment a bit more
// expensive, but in exchange the refund on every call to nonReentrant
// will be lower in amount. Since refunds are capped to a percetange of
// the total transaction's gas, it is best to keep them low in cases
// like this one, to increase the likelihood of the full refund coming
// into effect.
_notEntered = true;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_notEntered, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_notEntered = false;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_notEntered = true;
}
}
// File: node_modules\openzeppelin-solidity\contracts\utils\Address.sol
pragma solidity ^0.5.5;
/**
* @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 Converts an `address` into `address payable`. Note that this is
* simply a type cast: the actual underlying value is not changed.
*
* _Available since v2.4.0._
*/
function toPayable(address account) internal pure returns (address payable) {
return address(uint160(account));
}
/**
* @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].
*
* _Available since v2.4.0._
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-call-value
(bool success, ) = recipient.call.value(amount)("");
require(success, "Address: unable to send value, recipient may have reverted");
}
}
// File: contracts\Eclipseum.sol
pragma solidity =0.5.17;
/// @title The Eclipseum ERC20 Smart Contract
contract Eclipseum is ERC20, ERC20Detailed, ReentrancyGuard {
using SafeMath for uint256;
using Address for address payable;
struct SoftSellEclAmountsToReceive {
uint256 ethFromEclPool;
uint256 ethFromDaiPool;
uint256 daiFromDaiPool;
}
IERC20 public daiInterface;
bool public launched;
uint256 public ethBalanceOfEclPool;
uint256 public ethVolumeOfEclPool;
uint256 public ethVolumeOfDaiPool;
event LogBuyEcl(
address indexed userAddress,
uint256 ethSpent,
uint256 eclReceived
);
event LogSellEcl(
address indexed userAddress,
uint256 eclSold,
uint256 ethReceived
);
event LogSoftSellEcl(
address indexed userAddress,
uint256 eclSold,
uint256 ethReceived,
uint256 daiReceived
);
event LogBuyDai(
address indexed userAddress,
uint256 ethSpent,
uint256 daiReceived
);
event LogSellDai(
address indexed userAddress,
uint256 daiSold,
uint256 ethReceived
);
modifier requireLaunched() {
require(launched, "Contract must be launched to invoke this function.");
_;
}
/// @notice Must be called with at least 0.02 ETH.
/// @notice Mints 100,000 ECL into the contract account
constructor(address _daiAddress)
public
payable
ERC20Detailed("Eclipseum", "ECL", 18)
{
require(
msg.value >= 0.02 ether,
"Must call constructor with at least 0.02 Ether."
);
_mint(address(this), 1e5 * (10**18));
daiInterface = IERC20(_daiAddress);
}
/// @notice This function is called once after deployment to launch the contract.
/// @notice Some amount of DAI must be transferred to the contract for launch to succeed.
/// @notice Once launched, the transaction functions may be invoked.
function launch() external {
require(!launched, "Contract has already been launched.");
require(
daiInterface.balanceOf(address(this)) > 0,
"DAI pool balance must be greater than zero to launch contract."
);
ethBalanceOfEclPool = 0.01 ether;
launched = true;
}
/// @notice Enables a user to buy ECL with ETH from the ECL liquidity pool.
/// @param minEclToReceive The minimum amount of ECL the user is willing to receive.
/// @param deadline Epoch time deadline that the transaction must complete before, otherwise reverts.
function buyEcl(uint256 minEclToReceive, uint256 deadline)
external
payable
nonReentrant
requireLaunched
{
require(
deadline >= block.timestamp,
"Transaction deadline has elapsed."
);
require(msg.value > 0, "Value of ETH sent must be greater than zero.");
uint256 ethBalanceOfDaiPoolLocal = ethBalanceOfDaiPool().sub(msg.value);
uint256 eclBalanceOfEclPoolLocal = eclBalanceOfEclPool();
uint256 eclToReceive = applyTransactionFee(
calcBOut(ethBalanceOfEclPool, eclBalanceOfEclPoolLocal, msg.value)
);
uint256 eclToMint = eclToReceive.mul(7).div(6).add(1);
uint256 ethTransferToDaiPool = calcEthTransferForBuyEcl(
ethBalanceOfEclPool,
ethBalanceOfDaiPoolLocal,
msg.value
);
require(
eclToReceive >= minEclToReceive,
"Unable to send the minimum quantity of ECL to receive."
);
ethBalanceOfEclPool = ethBalanceOfEclPool.add(msg.value).sub(
ethTransferToDaiPool
);
ethBalanceOfDaiPoolLocal = ethBalanceOfDaiPoolLocal.add(
ethTransferToDaiPool
);
eclBalanceOfEclPoolLocal = eclBalanceOfEclPoolLocal
.sub(eclToReceive)
.add(eclToMint);
ethVolumeOfEclPool += msg.value;
emit LogBuyEcl(msg.sender, msg.value, eclToReceive);
_transfer(address(this), msg.sender, eclToReceive);
_mint(address(this), eclToMint);
assert(ethBalanceOfDaiPoolLocal == ethBalanceOfDaiPool());
assert(eclBalanceOfEclPoolLocal == eclBalanceOfEclPool());
assert(ethBalanceOfEclPool > 0);
assert(ethBalanceOfDaiPool() > 0);
assert(eclBalanceOfEclPool() > 0);
assert(daiBalanceOfDaiPool() > 0);
}
/// @notice Enables a user to sell ECL for ETH to the ECL liquidity pool.
/// @param eclSold The amount of ECL the user is selling.
/// @param minEthToReceive The minimum amount of ETH the user is willing to receive.
/// @param deadline Epoch time deadline that the transaction must complete before.
function sellEcl(
uint256 eclSold,
uint256 minEthToReceive,
uint256 deadline
) external nonReentrant requireLaunched {
require(
deadline >= block.timestamp,
"Transaction deadline has elapsed."
);
require(eclSold > 0, "Value of ECL sold must be greater than zero.");
require(
eclSold <= balanceOf(address(msg.sender)),
"ECL sold must be less than or equal to ECL balance."
);
uint256 ethBalanceOfDaiPoolLocal = ethBalanceOfDaiPool();
uint256 eclBalanceOfEclPoolLocal = eclBalanceOfEclPool();
uint256 eclToBurn = eclSold.mul(7).div(6);
uint256 ethToReceive = applyTransactionFee(
calcBOut(eclBalanceOfEclPoolLocal, ethBalanceOfEclPool, eclSold)
);
require(
ethToReceive >= minEthToReceive,
"Unable to send the minimum quantity of ETH to receive."
);
ethBalanceOfEclPool = ethBalanceOfEclPool.sub(ethToReceive);
eclBalanceOfEclPoolLocal = eclBalanceOfEclPoolLocal.add(eclSold).sub(
eclToBurn
);
ethVolumeOfEclPool += ethToReceive;
emit LogSellEcl(msg.sender, eclSold, ethToReceive);
_transfer(address(msg.sender), address(this), eclSold);
_burn(address(this), eclToBurn);
msg.sender.sendValue(ethToReceive);
assert(ethBalanceOfDaiPoolLocal == ethBalanceOfDaiPool());
assert(eclBalanceOfEclPoolLocal == eclBalanceOfEclPool());
assert(ethBalanceOfEclPool > 0);
assert(ethBalanceOfDaiPool() > 0);
assert(eclBalanceOfEclPool() > 0);
assert(daiBalanceOfDaiPool() > 0);
}
/// @notice Enables a user to sell ECL for ETH and DAI to the ECL liquidity pool.
/// @param eclSold The amount of ECL the user is selling.
/// @param minEthToReceive The minimum amount of ETH the user is willing to receive.
/// @param minDaiToReceive The minimum amount of DAI the user is willing to receive.
/// @param deadline Epoch time deadline that the transaction must complete before.
function softSellEcl(
uint256 eclSold,
uint256 minEthToReceive,
uint256 minDaiToReceive,
uint256 deadline
) external nonReentrant requireLaunched {
require(
deadline >= block.timestamp,
"Transaction deadline has elapsed."
);
require(eclSold > 0, "Value of ECL sold must be greater than zero.");
require(
eclSold <= balanceOf(address(msg.sender)),
"ECL sold must be less than or equal to ECL balance."
);
uint256 ethBalanceOfDaiPoolLocal = ethBalanceOfDaiPool();
uint256 circulatingSupplyLocal = circulatingSupply();
uint256 eclBalanceOfEclPoolLocal = eclBalanceOfEclPool();
uint256 daiBalanceOfDaiPoolLocal = daiBalanceOfDaiPool();
uint256 eclToBurn = applyTransactionFee(
eclSold.mul(eclBalanceOfEclPoolLocal).div(circulatingSupplyLocal)
)
.add(eclSold);
SoftSellEclAmountsToReceive memory amountsToReceive;
amountsToReceive.ethFromEclPool = applyTransactionFee(
eclSold.mul(ethBalanceOfEclPool).div(circulatingSupplyLocal)
);
amountsToReceive.ethFromDaiPool = applyTransactionFee(
eclSold.mul(ethBalanceOfDaiPoolLocal).div(circulatingSupplyLocal)
);
amountsToReceive.daiFromDaiPool = applyTransactionFee(
eclSold.mul(daiBalanceOfDaiPoolLocal).div(circulatingSupplyLocal)
);
require(
amountsToReceive.ethFromEclPool.add(
amountsToReceive.ethFromDaiPool
) >= minEthToReceive,
"Unable to send the minimum quantity of ETH to receive."
);
require(
amountsToReceive.daiFromDaiPool >= minDaiToReceive,
"Unable to send the minimum quantity of DAI to receive."
);
ethBalanceOfEclPool = ethBalanceOfEclPool.sub(
amountsToReceive.ethFromEclPool
);
ethBalanceOfDaiPoolLocal = ethBalanceOfDaiPoolLocal.sub(
amountsToReceive.ethFromDaiPool
);
daiBalanceOfDaiPoolLocal = daiBalanceOfDaiPoolLocal.sub(
amountsToReceive.daiFromDaiPool
);
eclBalanceOfEclPoolLocal = eclBalanceOfEclPoolLocal.add(eclSold).sub(
eclToBurn
);
ethVolumeOfEclPool += amountsToReceive.ethFromEclPool;
ethVolumeOfDaiPool += amountsToReceive.ethFromDaiPool;
emit LogSoftSellEcl(
msg.sender,
eclSold,
amountsToReceive.ethFromEclPool.add(
amountsToReceive.ethFromDaiPool
),
amountsToReceive.daiFromDaiPool
);
_transfer(address(msg.sender), address(this), eclSold);
_burn(address(this), eclToBurn);
require(
daiInterface.transfer(msg.sender, amountsToReceive.daiFromDaiPool),
"DAI Transfer failed."
);
msg.sender.sendValue(
amountsToReceive.ethFromEclPool.add(amountsToReceive.ethFromDaiPool)
);
assert(
ethBalanceOfEclPool.add(ethBalanceOfDaiPoolLocal) ==
address(this).balance
);
assert(eclBalanceOfEclPoolLocal == eclBalanceOfEclPool());
assert(daiBalanceOfDaiPoolLocal == daiBalanceOfDaiPool());
assert(ethBalanceOfDaiPoolLocal == ethBalanceOfDaiPool());
assert(ethBalanceOfEclPool > 0);
assert(ethBalanceOfDaiPool() > 0);
assert(eclBalanceOfEclPool() > 0);
assert(daiBalanceOfDaiPool() > 0);
}
/// @notice Enables a user to buy DAI with ETH from the DAI liquidity pool.
/// @param minDaiToReceive The minimum amount of DAI the user is willing to receive.
/// @param deadline Epoch time deadline that the transaction must complete before.
function buyDai(uint256 minDaiToReceive, uint256 deadline)
external
payable
nonReentrant
requireLaunched
{
require(
deadline >= block.timestamp,
"Transaction deadline has elapsed."
);
require(msg.value > 0, "Value of ETH sent must be greater than zero.");
uint256 ethBalanceOfDaiPoolLocal = ethBalanceOfDaiPool().sub(msg.value);
uint256 daiBalanceOfDaiPoolLocal = daiBalanceOfDaiPool();
uint256 daiToReceive = applyTransactionFee(
calcBOut(
ethBalanceOfDaiPoolLocal,
daiBalanceOfDaiPoolLocal,
msg.value
)
);
uint256 ethTransferToEclPool = msg.value.mul(15).div(10000);
require(
daiToReceive >= minDaiToReceive,
"Unable to send the minimum quantity of DAI to receive."
);
ethBalanceOfEclPool = ethBalanceOfEclPool.add(ethTransferToEclPool);
ethBalanceOfDaiPoolLocal = ethBalanceOfDaiPoolLocal.add(msg.value).sub(
ethTransferToEclPool
);
daiBalanceOfDaiPoolLocal = daiBalanceOfDaiPoolLocal.sub(daiToReceive);
ethVolumeOfDaiPool += msg.value;
emit LogBuyDai(msg.sender, msg.value, daiToReceive);
require(
daiInterface.transfer(address(msg.sender), daiToReceive),
"DAI Transfer failed."
);
assert(ethBalanceOfDaiPoolLocal == ethBalanceOfDaiPool());
assert(daiBalanceOfDaiPoolLocal == daiBalanceOfDaiPool());
assert(ethBalanceOfEclPool > 0);
assert(ethBalanceOfDaiPool() > 0);
assert(eclBalanceOfEclPool() > 0);
assert(daiBalanceOfDaiPool() > 0);
}
/// @notice Enables a user to sell DAI for ETH to the DAI liquidity pool.
/// @param daiSold The amount of DAI the user is selling.
/// @param minEthToReceive The minimum amount of ETH the user is willing to receive.
/// @param deadline Epoch time deadline that the transaction must complete before.
function sellDai(
uint256 daiSold,
uint256 minEthToReceive,
uint256 deadline
) external nonReentrant requireLaunched {
require(
deadline >= block.timestamp,
"Transaction deadline has elapsed."
);
require(daiSold > 0, "Value of DAI sold must be greater than zero.");
require(
daiSold <= daiInterface.balanceOf(address(msg.sender)),
"DAI sold must be less than or equal to DAI balance."
);
require(
daiSold <=
daiInterface.allowance(address(msg.sender), address(this)),
"DAI sold exceeds allowance."
);
uint256 ethBalanceOfDaiPoolLocal = ethBalanceOfDaiPool();
uint256 daiBalanceOfDaiPoolLocal = daiBalanceOfDaiPool();
uint256 ethToReceiveBeforeFee = calcBOut(
daiBalanceOfDaiPoolLocal,
ethBalanceOfDaiPoolLocal,
daiSold
);
uint256 ethToReceive = applyTransactionFee(ethToReceiveBeforeFee);
uint256 ethTransferToEclPool = ethToReceiveBeforeFee
.sub(ethToReceive)
.div(2);
require(
ethToReceive >= minEthToReceive,
"Unable to send the minimum quantity of ETH to receive."
);
ethBalanceOfEclPool = ethBalanceOfEclPool.add(ethTransferToEclPool);
ethBalanceOfDaiPoolLocal = ethBalanceOfDaiPoolLocal
.sub(ethToReceive)
.sub(ethTransferToEclPool);
daiBalanceOfDaiPoolLocal = daiBalanceOfDaiPoolLocal.add(daiSold);
ethVolumeOfDaiPool += ethToReceive;
emit LogSellDai(msg.sender, daiSold, ethToReceive);
require(
daiInterface.transferFrom(
address(msg.sender),
address(this),
daiSold
),
"DAI Transfer failed."
);
msg.sender.sendValue(ethToReceive);
assert(ethBalanceOfDaiPoolLocal == ethBalanceOfDaiPool());
assert(daiBalanceOfDaiPoolLocal == daiBalanceOfDaiPool());
assert(ethBalanceOfEclPool > 0);
assert(ethBalanceOfDaiPool() > 0);
assert(eclBalanceOfEclPool() > 0);
assert(daiBalanceOfDaiPool() > 0);
}
/// @notice Calculates amount of asset B for user to receive using constant product market maker algorithm.
/// @dev A value of one is subtracted in the _bToReceive calculation such that rounding
/// @dev errors favour the pool over the user.
/// @param aBalance The balance of asset A in the liquidity pool.
/// @param bBalance The balance of asset B in the liquidity pool.
/// @param aSent The quantity of asset A sent by the user to the liquidity pool.
/// @return bToReceive The quantity of asset B the user would receive before transaction fee is applied.
function calcBOut(
uint256 aBalance,
uint256 bBalance,
uint256 aSent
) public pure returns (uint256) {
uint256 denominator = aBalance.add(aSent);
uint256 fraction = aBalance.mul(bBalance).div(denominator);
uint256 bToReceive = bBalance.sub(fraction).sub(1);
assert(bToReceive < bBalance);
return bToReceive;
}
/// @notice Calculates the amount of ETH to transfer from the ECL pool to the DAI pool for the buyEcl function.
/// @param ethBalanceOfEclPoolLocal The balance of ETH in the ECL liquidity pool.
/// @param ethBalanceOfDaiPoolLocal The balance of ETH in the DAI liquidity pool.
/// @param ethSent The quantity of ETH sent by the user in the buyEcl function.
/// @return ethTransferToDaiPool The quantity of ETH to transfer from the ECL pool to the DAI pool.
function calcEthTransferForBuyEcl(
uint256 ethBalanceOfEclPoolLocal,
uint256 ethBalanceOfDaiPoolLocal,
uint256 ethSent
) public pure returns (uint256) {
uint256 ethTransferToDaiPool;
if (
ethBalanceOfEclPoolLocal >=
ethSent.mul(4).div(6).add(ethBalanceOfDaiPoolLocal)
) {
ethTransferToDaiPool = ethSent.mul(5).div(6);
} else if (
ethSent.add(ethBalanceOfEclPoolLocal) <= ethBalanceOfDaiPoolLocal
) {
ethTransferToDaiPool = 0;
} else {
ethTransferToDaiPool = ethSent
.add(ethBalanceOfEclPoolLocal)
.sub(ethBalanceOfDaiPoolLocal)
.div(2);
}
assert(ethTransferToDaiPool <= ethSent.mul(5).div(6));
return ethTransferToDaiPool;
}
/// @notice Calculates the amount for the user to receive with a 0.3% transaction fee applied.
/// @param amountBeforeFee The amount the user will receive before transaction fee is applied.
/// @return amountAfterFee The amount the user will receive with transaction fee applied.
function applyTransactionFee(uint256 amountBeforeFee)
public
pure
returns (uint256)
{
uint256 amountAfterFee = amountBeforeFee.mul(997).div(1000);
return amountAfterFee;
}
/// @notice Returns the ECL balance of the ECL pool.
function eclBalanceOfEclPool()
public
view
requireLaunched
returns (uint256)
{
return balanceOf(address(this));
}
/// @notice Returns the ETH balance of the DAI pool.
function ethBalanceOfDaiPool()
public
view
requireLaunched
returns (uint256)
{
return address(this).balance.sub(ethBalanceOfEclPool);
}
/// @notice Returns the DAI balance of the DAI pool.
function daiBalanceOfDaiPool()
public
view
requireLaunched
returns (uint256)
{
return daiInterface.balanceOf(address(this));
}
/// @notice Returns the circulating supply of ECL.
function circulatingSupply() public view requireLaunched returns (uint256) {
return totalSupply().sub(eclBalanceOfEclPool());
}
}