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ComptrollerLens Contract

The ComptrollerLens contract has functions to get the number of tokens that can be seized through liquidation, hypothetical account liquidity and shortfall of an account.

Solidity API

struct AccountLiquidityLocalVars {
  uint256 sumCollateral;
  uint256 sumBorrowPlusEffects;
  uint256 vTokenBalance;
  uint256 borrowBalance;
  uint256 exchangeRateMantissa;
  uint256 oraclePriceMantissa;
  struct ExponentialNoError.Exp weightedFactor;
  struct ExponentialNoError.Exp exchangeRate;
  struct ExponentialNoError.Exp oraclePrice;
  struct ExponentialNoError.Exp tokensToDenom;
}

liquidateCalculateSeizeTokens

Computes the number of collateral tokens to be seized in a liquidation event

function liquidateCalculateSeizeTokens(address comptroller, address vTokenBorrowed, address vTokenCollateral, uint256 actualRepayAmount) external view returns (uint256, uint256)

Parameters

Name	Type	Description
comptroller	address	Address of comptroller
vTokenBorrowed	address	Address of the borrowed vToken
vTokenCollateral	address	Address of collateral for the borrow
actualRepayAmount	uint256	Repayment amount i.e amount to be repaid of total borrowed amount

Return Values

Name	Type	Description
[0]	uint256	A tuple of error code, and tokens to seize
[1]	uint256

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liquidateCalculateSeizeTokens

Computes the number of collateral tokens to be seized in a liquidation event

function liquidateCalculateSeizeTokens(address borrower, address comptroller, address vTokenBorrowed, address vTokenCollateral, uint256 actualRepayAmount) external view returns (uint256, uint256)

Parameters

Name	Type	Description
borrower	address	Address of borrower whose collateral is being seized
comptroller	address	Address of comptroller
vTokenBorrowed	address	Address of the borrowed vToken
vTokenCollateral	address	Address of collateral for the borrow
actualRepayAmount	uint256	Repayment amount i.e amount to be repaid of total borrowed amount

Return Values

Name	Type	Description
[0]	uint256	A tuple of error code, and tokens to seize
[1]	uint256

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liquidateVAICalculateSeizeTokens

Computes the number of VAI tokens to be seized in a liquidation event

function liquidateVAICalculateSeizeTokens(address comptroller, address vTokenCollateral, uint256 actualRepayAmount) external view returns (uint256, uint256)

Parameters

Name	Type	Description
comptroller	address	Address of comptroller
vTokenCollateral	address	Address of collateral for vToken
actualRepayAmount	uint256	Repayment amount i.e amount to be repaid of the total borrowed amount

Return Values

Name	Type	Description
[0]	uint256	A tuple of error code, and tokens to seize
[1]	uint256

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getHypotheticalAccountLiquidity

Computes the hypothetical liquidity and shortfall of an account given a hypothetical borrow A snapshot of the account is taken and the total borrow amount of the account is calculated

function getHypotheticalAccountLiquidity(address comptroller, address account, contract VToken vTokenModify, uint256 redeemTokens, uint256 borrowAmount, enum WeightFunction weightingStrategy) external view returns (uint256, uint256, uint256)

Parameters

Name	Type	Description
comptroller	address	Address of comptroller
account	address	Address of the borrowed vToken
vTokenModify	contract VToken	Address of collateral for vToken
redeemTokens	uint256	Number of vTokens being redeemed
borrowAmount	uint256	Amount borrowed
weightingStrategy	enum WeightFunction	The weighting strategy to use: - WeightFunction.USE_COLLATERAL_FACTOR to use collateral factor - WeightFunction.USE_LIQUIDATION_THRESHOLD to use liquidation threshold

Return Values

Name	Type	Description
[0]	uint256	Returns a tuple of error code, liquidity, and shortfall
[1]	uint256
[2]	uint256

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