VAIController

VAI Comptroller

This is the implementation contract for the VAIUnitroller proxy

Solidity API

INITIAL_VAI_MINT_INDEX

Initial index used in interest computations

uint256 INITIAL_VAI_MINT_INDEX

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CORE_POOL_ID

poolId for core Pool

uint96 CORE_POOL_ID

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mintVAI

The mintVAI function mints and transfers VAI from the protocol to the user, and adds a borrow balance. The amount minted must be less than the user’s Account Liquidity and the mint vai limit.

function mintVAI(uint256 mintVAIAmount) external returns (uint256)

Parameters

Name	Type	Description
mintVAIAmount	uint256	The amount of the VAI to be minted.

Return Values

Name	Type	Description
[0]	uint256	0 on success, otherwise an error code

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repayVAI

The repay function transfers VAI interest into the protocol and burns the rest, reducing the borrower’s borrow balance. Before repaying VAI, users must first approve VAIController to access their VAI balance.

function repayVAI(uint256 amount) external returns (uint256, uint256)

Parameters

Name	Type	Description
amount	uint256	The amount of VAI to be repaid.

Return Values

Name	Type	Description
[0]	uint256	Error code (0=success, otherwise a failure, see ErrorReporter.sol)
[1]	uint256	Actual repayment amount

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repayVAIBehalf

The repay on behalf function transfers VAI interest into the protocol and burns the rest, reducing the borrower’s borrow balance. Borrowed VAIs are repaid by another user (possibly the borrower). Before repaying VAI, the payer must first approve VAIController to access their VAI balance.

function repayVAIBehalf(address borrower, uint256 amount) external returns (uint256, uint256)

Parameters

Name	Type	Description
borrower	address	The account to repay the debt for.
amount	uint256	The amount of VAI to be repaid.

Return Values

Name	Type	Description
[0]	uint256	Error code (0=success, otherwise a failure, see ErrorReporter.sol)
[1]	uint256	Actual repayment amount

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liquidateVAI

The sender liquidates the vai minters collateral. The collateral seized is transferred to the liquidator.

function liquidateVAI(address borrower, uint256 repayAmount, contract VTokenInterface vTokenCollateral) external returns (uint256, uint256)

Parameters

Name	Type	Description
borrower	address	The borrower of vai to be liquidated
repayAmount	uint256	The amount of the underlying borrowed asset to repay
vTokenCollateral	contract VTokenInterface	The market in which to seize collateral from the borrower

Return Values

Name	Type	Description
[0]	uint256	Error code (0=success, otherwise a failure, see ErrorReporter.sol)
[1]	uint256	Actual repayment amount

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_setComptroller

Sets a new comptroller

function _setComptroller(contract ComptrollerInterface comptroller_) external returns (uint256)

Return Values

Name	Type	Description
[0]	uint256	uint256 0=success, otherwise a failure (see ErrorReporter.sol for details)

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setPrimeToken

Set the prime token contract address

function setPrimeToken(address prime_) external

Parameters

Name	Type	Description
prime_	address	The new address of the prime token contract

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setVAIToken

Set the VAI token contract address

function setVAIToken(address vai_) external

Parameters

Name	Type	Description
vai_	address	The new address of the VAI token contract

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toggleOnlyPrimeHolderMint

Toggle mint only for prime holder

function toggleOnlyPrimeHolderMint() external returns (uint256)

Return Values

Name	Type	Description
[0]	uint256	uint256 0=success, otherwise a failure (see ErrorReporter.sol for details)

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struct AccountAmountLocalVars {
  uint256 oErr;
  enum CarefulMath.MathError mErr;
  uint256 sumSupply;
  uint256 marketSupply;
  uint256 sumBorrowPlusEffects;
  uint256 vTokenBalance;
  uint256 borrowBalance;
  uint256 exchangeRateMantissa;
  uint256 oraclePriceMantissa;
  struct ExponentialNoError.Exp exchangeRate;
  struct ExponentialNoError.Exp oraclePrice;
  struct ExponentialNoError.Exp tokensToDenom;
}

getMintableVAI

Function that returns the amount of VAI a user can mint based on their account liquidy and the VAI mint rate If mintEnabledOnlyForPrimeHolder is true, only Prime holders are able to mint VAI

function getMintableVAI(address minter) public view returns (uint256, uint256)

Parameters

Name	Type	Description
minter	address	The account to check mintable VAI

Return Values

Name	Type	Description
[0]	uint256	Error code (0=success, otherwise a failure, see ErrorReporter.sol for details)
[1]	uint256	Mintable amount (with 18 decimals)

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_setTreasuryData

Update treasury data

function _setTreasuryData(address newTreasuryGuardian, address newTreasuryAddress, uint256 newTreasuryPercent) external returns (uint256)

Parameters

Name	Type	Description
newTreasuryGuardian	address	New Treasury Guardian address
newTreasuryAddress	address	New Treasury Address
newTreasuryPercent	uint256	New fee percentage for minting VAI that is sent to the treasury

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getVAIRepayRate

Gets yearly VAI interest rate based on the VAI price

function getVAIRepayRate() public view returns (uint256)

Return Values

Name	Type	Description
[0]	uint256	uint256 Yearly VAI interest rate

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getVAIRepayRatePerBlock

Get interest rate per block

function getVAIRepayRatePerBlock() public view returns (uint256)

Return Values

Name	Type	Description
[0]	uint256	uint256 Interest rate per bock

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getVAIMinterInterestIndex

Get the last updated interest index for a VAI Minter

function getVAIMinterInterestIndex(address minter) public view returns (uint256)

Parameters

Name	Type	Description
minter	address	Address of VAI minter

Return Values

Name	Type	Description
[0]	uint256	uint256 Returns the interest rate index for a minter

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getVAIRepayAmount

Get the current total VAI a user needs to repay

function getVAIRepayAmount(address account) public view returns (uint256)

Parameters

Name	Type	Description
account	address	The address of the VAI borrower

Return Values

Name	Type	Description
[0]	uint256	(uint256) The total amount of VAI the user needs to repay

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getVAICalculateRepayAmount

Calculate how much VAI the user needs to repay

function getVAICalculateRepayAmount(address borrower, uint256 repayAmount) public view returns (uint256, uint256, uint256)

Parameters

Name	Type	Description
borrower	address	The address of the VAI borrower
repayAmount	uint256	The amount of VAI being returned

Return Values

Name	Type	Description
[0]	uint256	Amount of VAI to be burned
[1]	uint256	Amount of VAI the user needs to pay in current interest
[2]	uint256	Amount of VAI the user needs to pay in past interest

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accrueVAIInterest

Accrue interest on outstanding minted VAI

function accrueVAIInterest() public

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setAccessControl

Sets the address of the access control of this contract

function setAccessControl(address newAccessControlAddress) external

Parameters

Name	Type	Description
newAccessControlAddress	address	New address for the access control

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setBaseRate

Set VAI borrow base rate

function setBaseRate(uint256 newBaseRateMantissa) external

Parameters

Name	Type	Description
newBaseRateMantissa	uint256	the base rate multiplied by 10**18

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setFloatRate

Set VAI borrow float rate

function setFloatRate(uint256 newFloatRateMantissa) external

Parameters

Name	Type	Description
newFloatRateMantissa	uint256	the VAI float rate multiplied by 10**18

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setReceiver

Set VAI stability fee receiver address

function setReceiver(address newReceiver) external

Parameters

Name	Type	Description
newReceiver	address	the address of the VAI fee receiver

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setMintCap

Set VAI mint cap

function setMintCap(uint256 _mintCap) external

Parameters

Name	Type	Description
_mintCap	uint256	the amount of VAI that can be minted

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getVAIAddress

Return the address of the VAI token

function getVAIAddress() public view virtual returns (address)

Return Values

Name	Type	Description
[0]	address	The address of VAI

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