GoodMarketMaker

Helper contract for the GoodReserveCDai. It serves as a dynamic reserve ratio market maker.

Events

BalancesUpdated

Emits when a change has occurred in a reserve balance, i.e. buy / sell will change the balance.

Parameter name	Annotation
caller	The account who initiated the action.
reserveToken	The address of the reserve token.
amount	The incoming amount.
returnAmount	The return value.
totalSupply	The updated total supply.
reserveBalance	The updated reserve balance.

event BalancesUpdated(
    address indexed caller,
    address indexed reserveToken,
    uint256 amount,
    uint256 returnAmount,
    uint256 totalSupply,
    uint256 reserveBalance
);

ReserveRatioUpdated

Emits when the ratio changed. The caller should be the Avatar by definition.

Parameter name	Annotation
caller	The address of the staker.
nom	Nominator of the ratio.
denom	Denominator of the ratio.

event ReserveRatioUpdated(address indexed caller, uint256 nom, uint256 denom);

calculateNewReserveRatio

Calculates how much to decrease the reserve ratio for _token by the reserveRatioDailyExpansion.

Parameter name	Annotation
_token	The reserve token to calculate the reserve ratio for.

Returns: the new reserve ratio.

function calculateNewReserveRatio(ERC20 _token) public view returns (uint32);

buyReturn

Calculates the buy return in G$ according to the given _tokenAmount.

Parameter name	Annotation
_token	The reserve token buying with.
_tokenAmount	The amount of reserve token buying with.

Returns: A number of G$ that should be given in exchange as calculated by the bonding curve.

function buyReturn(ERC20 _token, uint256 _tokenAmount);

sellReturn

Calculates the sell return in _token according to the given _gdAmount.

Parameter name	Annotation
_token	The reserve token buying with.
_gdAmount	The amount of reserve token buying with.

Returns: A number of tokens that should be given in exchange as calculated by the bonding curve.

function sellReturn(ERC20 _token, uint256 _gdAmount);

buy

Updates the _token bonding curve params. Emits BalancesUpdated with the new reserve token information.

Parameter name	Annotation
_token	The reserve token buying with.
_tokenAmount	The amount of reserve token buying with.

Returns: A number of G$ that will be given in exchange as calculated by the bonding curve.

function buy(ERC20 _token, uint256 _tokenAmount);

sellWithContribution

Calculates the sell return with contribution in _token and update the bonding curve params. Emits BalancesUpdated with the new reserve token information.

Parameter name	Annotation
_token	The desired reserve token to have.
_gdAmount	The amount of G$ that are sold.
_contributionGdAmount	The number of G$ tokens that will not be traded for the reserve token.

Returns: A number of tokens that will be given in exchange as calculated by the bonding curve.

function sellWithContribution(
	ERC20 _token,
	uint256 _gdAmount,
	uint256 _contributionGdAmount
) public returns (uint256);