ICoolerTreasuryBorrower

Git Source

Policy which can borrow from Treasury on behalf of Cooler

• Cooler will always represent the debt amount in 18 decimal places.
• This logic is split out into a separate policy (rather than using TreasuryCustodian): 1/ So the Cooler debt token can be updated if required in future to another stablecoin without a redeploy of Cooler. 2/ In this case, debt is denominated in USDS but stored 'at rest' in Treasury into sUSDS for extra yield.
• Upon an upgreade, if the actual debt token is changed (with a new deployment of this contract) to a non 18dp asset eg USDC, then borrow() and repay() will need to do the conversion.

Functions

borrow

Cooler borrows amount of debtToken from treasury, sent to recipient

If the debtToken is 6dp (eg USDC) then this contract needs to handle the conversion internally

function borrow(uint256 amountInWad, address recipient) external;

Parameters

Name	Type	Description
amountInWad	uint256	The amount to borrow. Always 18 decimal places regardless of the debtToken.decimals()
recipient	address

repay

Repay any debtToken in this contract back to treasury.

Cooler is expected to transfer the amount to this contract prior to calling

function repay() external;

writeOffDebt

Cooler may write off debt in the case of liquidations.

This reduces the policies debt to TRSRY

function writeOffDebt(uint256 debtTokenAmount) external;

setDebt

In the case of a Cooler debt token change (eg USDS => USDC), the debt may be manually net settled from the old debt token (in the old cooler treasury borrower) to the new debt token (in the new cooler treasury borrower)

function setDebt(uint256 debtTokenAmount) external;

Parameters

Name	Type	Description
debtTokenAmount	uint256	The amount of debt to set in Treasury, in the debtToken.decimals() precision

debtToken

The token (USD based stablecoin) which Cooler users borrow and repay

function debtToken() external view returns (IERC20);

convertToDebtTokenAmount

Convert a debt amount in wad (18dp) into the decimals of the debtToken

function convertToDebtTokenAmount(uint256 amountInWad) external view returns (IERC20 dToken, uint256 dTokenAmount);

DECIMALS

The decimal precision of the amountInWad used in borrow and repay functions.

A constant of 18

function DECIMALS() external view returns (uint8);

Errors

OnlyCooler

error OnlyCooler();

InvalidParam

error InvalidParam();

InvalidAddress

error InvalidAddress();

ExpectedNonZero

error ExpectedNonZero();