一个抽象合约，其中包含 FraxlendPair 的核心逻辑和存储。
构造函数在合约部署时被调用。
初始化函数initialize在部署后立即被调用。
此函数只能由部署者调用。
_totalAssetAvailable 函数返回合约中资产代币的总余额。
_isSolvent 函数用于判断在给定的汇率下，特定借款人是否具备偿还能力。
_isPastMaturity 函数用于判断当前区块时间戳是否已经超过到期日期（maturityDate）。
在执行合约代码后检查偿还能力。
检查 msg.sender 是否为已批准的借款人。
检查 msg.sender 和 _receiver 是否都是已批准的贷款人。
确保在超过到期日期时不调用该函数。
当借款人累积利息时，发出 AddInterest 事件。
当利率更新时，发出 UpdateRate 事件。
addInterest 函数是 _addInterest 的公共实现，允许第三方触发利息的累积。
_addInterest 函数在每个外部函数调用之前被调用，用于累积利息并更新利率。
该函数每个区块只能调用一次。
当抵押品与资产的汇率更新时，发出 UpdateExchangeRate 事件。
updateExchangeRate 函数是 _updateExchangeRate 的外部实现。
由于这些查询可能会很耗费资源，该函数在每个区块中最多只能被调用一次。
_updateExchangeRate 函数用于获取最新的汇率，即购买 1e18 资产所需的抵押品数量。
由于这些查询可能会非常耗费资源，该函数在每个区块中最多只能被调用一次。
_deposit 函数是用于出借资产的内部实现。
调用者必须在调用该函数之前对资产代币合约调用 ERC20.approve。
deposit 函数允许用户通过指定要出借的资产代币数量来出借资产。
调用者必须在调用该函数之前对资产代币合约调用 ERC20.approve。
mint 函数允许用户通过指定要铸造的资产股份（fTokens）数量来出借资产。
调用者必须在调用该函数之前对资产代币合约调用 ERC20.approve。
_redeem 函数是一个内部实现，允许贷款人从交易对中提取他们的资产代币。
调用者必须在调用该函数之前对资产代币合约调用 ERC20.approve。
redeem 函数允许调用者将他们的资产股份兑换为资产代币。
withdraw 函数允许用户将他们的资产股份兑换为指定数量的资产代币。
当借款人增加其头寸时，发出 BorrowAsset 事件。
_borrowAsset 函数是借款资产的内部实现。
borrowAsset 函数允许用户开立或增加借款头寸。
如果适用，借款人必须在调用该函数之前对抵押代币合约调用 ERC20.approve。
_addCollateral 函数是向借款人头寸添加抵押品的内部实现。
addCollateral 函数允许调用者向借款人头寸添加抵押代币。
msg.sender 必须在调用该函数之前对抵押代币合约调用 ERC20.approve()。
当抵押品从借款人的头寸中移除时，发出 RemoveCollateral 事件。
_removeCollateral 函数是从借款人头寸中移除抵押品的内部实现。
removeCollateral 函数用于从 msg.sender 的借款头寸中移除抵押品。
调用后，msg.sender 必须保持偿付能力，否则交易将会回退。
每当债务头寸被偿还时，发出 RepayAsset 事件。
_repayAsset 函数是偿还借款头寸的内部实现。
付款人必须在调用该函数之前对资产代币合约调用 ERC20.approve()。
repayAsset 函数允许调用者偿还特定借款人的债务。
调用者必须首先对资产代币合约调用 ERC20.approve()。
当发生清算时，发出 Liquidate 事件。
liquidate 函数允许第三方偿还已成为不偿还能力的借款人的债务。
调用者必须在调用 Liquidate() 之前对资产代币合约调用 ERC20.approve。
当借款人开立新的杠杆头寸时，发出 LeveragedPosition 事件。
leveragedPosition 函数允许用户以最小的前期抵押品进入杠杆借款头寸。
调用者必须在调用该函数之前对抵押代币合约调用 ERC20.approve()。
每当调用 repayAssetWithCollateral() 时，发出 RepayAssetWithCollateral 事件。
repayAssetWithCollateral 函数允许借款人使用合约中现有的抵押品偿还其债务。
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_configData
bytes
abi.encode(address _asset, address _collateral, address _oracleMultiply, address _oracleDivide, uint256 _oracleNormalization, address _rateContract, bytes memory _rateInitData)
_immutables
bytes
_maxLTV
uint256
The Maximum Loan-To-Value for a borrower to be considered solvent (1e5 precision)
_liquidationFee
uint256
The fee paid to liquidators given as a % of the repayment (1e5 precision)
_maturityDate
uint256
The maturityDate date of the Pair
_penaltyRate
uint256
The interest rate after maturity date
_isBorrowerWhitelistActive
bool
Enables borrower whitelist
_isLenderWhitelistActive
bool
Enables lender whitelist
_name
string
The name of the contract
_approvedBorrowers
address[]
An array of approved borrower addresses
_approvedLenders
address[]
An array of approved lender addresses
_rateInitCallData
bytes
The configuration data for the Rate Calculator contract
_totalAsset
struct VaultAccount
VaultAccount struct which stores total amount and shares for assets
_totalBorrow
struct VaultAccount
VaultAccount struct which stores total amount and shares for borrows
[0]
uint256
The balance of Asset Tokens held by contract
_borrower
address
The borrower address to check
_exchangeRate
uint256
The exchange rate, i.e. the amount of collateral to buy 1e18 asset
[0]
bool
Whether borrower is solvent
[0]
bool
Whether or not the debt is past maturity
_borrower
address
The borrower whose solvency we will check
_receiver
address
An additional receiver address to check
_interestEarned
uint256
The total interest accrued by all borrowers
_rate
uint256
The interest rate used to calculate accrued interest
_deltaTime
uint256
The time elapsed since last interest accrual
_feesAmount
uint256
The amount of fees paid to protocol
_feesShare
uint256
The amount of shares distributed to protocol
_ratePerSec
uint256
The old interest rate (per second)
_deltaTime
uint256
The time elapsed since last update
_utilizationRate
uint256
The utilization of assets in the Pair
_newRatePerSec
uint256
The new interest rate (per second)
_interestEarned
uint256
The amount of interest accrued by all borrowers
_feesAmount
uint256
_feesShare
uint256
_newRate
uint64
_interestEarned
uint256
The amount of interest accrued by all borrowers
_feesAmount
uint256
_feesShare
uint256
_newRate
uint64
_rate
uint256
The new rate given as the amount of Collateral Token to buy 1e18 Asset Token
_exchangeRate
uint256
The new exchange rate
_exchangeRate
uint256
The new exchange rate
_totalAsset
struct VaultAccount
An in memory VaultAccount struct representing the total amounts and shares for the Asset Token
_amount
uint128
The amount of Asset Token to be transferred
_shares
uint128
The amount of Asset Shares (fTokens) to be minted
_receiver
address
The address to receive the Asset Shares (fTokens)
_amount
uint256
The amount of Asset Token to transfer to Pair
_receiver
address
The address to receive the Asset Shares (fTokens)
_sharesReceived
uint256
The number of fTokens received for the deposit
_shares
uint256
The number of Asset Shares (fTokens) that a user wants to mint
_receiver
address
The address to receive the Asset Shares (fTokens)
_amountReceived
uint256
The amount of Asset Tokens transferred to the Pair
_totalAsset
struct VaultAccount
An in-memory VaultAccount struct which holds the total amount of Asset Tokens and the total number of Asset Shares (fTokens)
_amountToReturn
uint128
The number of Asset Tokens to return
_shares
uint128
The number of Asset Shares (fTokens) to burn
_receiver
address
The address to which the Asset Tokens will be transferred
_owner
address
The owner of the Asset Shares (fTokens)
_shares
uint256
The number of Asset Shares (fTokens) to burn for Asset Tokens
_receiver
address
The address to which the Asset Tokens will be transferred
_owner
address
The owner of the Asset Shares (fTokens)
_amountToReturn
uint256
The amount of Asset Tokens to be transferred
_amount
uint256
The amount of Asset Tokens to be transferred in exchange for burning Asset Shares
_receiver
address
The address to which the Asset Tokens will be transferred
_owner
address
The owner of the Asset Shares (fTokens)
_shares
uint256
The number of Asset Shares (fTokens) burned
_borrower
address
The borrower whose account was debited
_receiver
address
The address to which the Asset Tokens were transferred
_borrowAmount
uint256
The amount of Asset Tokens transferred
_sharesAdded
uint256
The number of Borrow Shares the borrower was debited
_borrowAmount
uint128
The amount of the Asset Token to borrow
_receiver
address
The address to receive the Asset Tokens
_sharesAdded
uint256
The amount of borrow shares the msg.sender will be debited
_borrowAmount
uint256
The amount of Asset Token to borrow
_collateralAmount
uint256
The amount of Collateral Token to transfer to Pair
_receiver
address
The address which will receive the Asset Tokens
_shares
uint256
The number of borrow Shares the msg.sender will be debited
_sender
address
The source of funds for the new collateral
_collateralAmount
uint256
The amount of Collateral Token to be transferred
_borrower
address
The borrower account for which the collateral should be credited
_collateralAmount
uint256
The amount of Collateral Token to be added to borrower's position
_borrower
address
The account to be credited
_sender
address
The account from which funds are transferred
_collateralAmount
uint256
The amount of Collateral Token to be transferred
_receiver
address
The address to which Collateral Tokens will be transferred
_borrower
address
_collateralAmount
uint256
The amount of Collateral Token to remove from the borrower's position
_receiver
address
The address to receive the Collateral Token transferred
_borrower
address
The borrower whose account will be debited the Collateral amount
_collateralAmount
uint256
The amount of Collateral Token to transfer
_receiver
address
The address to receive the transferred funds
_sender
address
The msg.sender of the transaction
_borrower
address
The borrower whose account will be credited
_amountToRepay
uint256
The amount of Asset token to be transferred
_shares
uint256
The amount of Borrow Shares which will be debited from the borrower after repayment
_totalBorrow
struct VaultAccount
An in memory copy of the totalBorrow VaultAccount struct
_amountToRepay
uint128
The amount of Asset Token to transfer
_shares
uint128
The number of Borrow Shares the sender is repaying
_payer
address
The address from which funds will be transferred
_borrower
address
The borrower account which will be credited
_shares
uint256
The number of Borrow Shares which will be repaid by the call
_borrower
address
The account for which the debt will be reduced
_amountToRepay
uint256
The amount of Asset Tokens which were transferred in order to repay the Borrow Shares
_borrower
address
The borrower account for which the liquidation occured
_collateralForLiquidator
uint256
The amount of Collateral Token transferred to the liquidator
_shares
uint256
The number of Borrow Shares the liquidator repaid on behalf of the borrower
_shares
uint256
The number of Borrow Shares repaid by the liquidator
_borrower
address
The account for which the repayment is credited and from whom collateral will be taken
_collateralForLiquidator
uint256
The amount of Collateral Token transferred to the liquidator
_borrower
address
The account for which the debt is debited
_swapperAddress
address
The address of the swapper which conforms the FraxSwap interface
_borrowAmount
uint256
The amount of Asset Token to be borrowed to be borrowed
_borrowShares
uint256
The number of Borrow Shares the borrower is credited
_initialCollateralAmount
uint256
The amount of initial Collateral Tokens supplied by the borrower
_amountCollateralOut
uint256
The amount of Collateral Token which was received for the Asset Tokens
_swapperAddress
address
The address of the whitelisted swapper to use to swap borrowed Asset Tokens for Collateral Tokens
_borrowAmount
uint256
The amount of Asset Tokens borrowed
_initialCollateralAmount
uint256
The initial amount of Collateral Tokens supplied by the borrower
_amountCollateralOutMin
uint256
The minimum amount of Collateral Tokens to be received in exchange for the borrowed Asset Tokens
_path
address[]
An array containing the addresses of ERC20 tokens to swap. Adheres to UniV2 style path params.
_totalCollateralBalance
uint256
The total amount of Collateral Tokens added to a users account (initial + swap)
_borrower
address
The borrower account for which the repayment is taking place
_swapperAddress
address
The address of the whitelisted swapper to use for token swaps
_collateralToSwap
uint256
The amount of Collateral Token to swap and use for repayment
_amountAssetOut
uint256
The amount of Asset Token which was repaid
_sharesRepaid
uint256
The number of Borrow Shares which were repaid
_swapperAddress
address
The address of the whitelisted swapper to use for token swaps
_collateralToSwap
uint256
The amount of Collateral Tokens to swap for Asset Tokens
_amountAssetOutMin
uint256
The minimum amount of Asset Tokens to receive during the swap
_path
address[]
An array containing the addresses of ERC20 tokens to swap. Adheres to UniV2 style path params.
_amountAssetOut
uint256
The amount of Asset Tokens received for the Collateral Tokens, the amount the borrowers account was credited
