keeper

package
v3.0.0-rc2 Latest Latest
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 Go to latest Published: Sep 20, 2022 License: Apache-2.0 Imports: 17 Imported by: 0

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Index

Constants

This section is empty.

Variables

View Source 
var EnableLiquidator = ""

EnableLiquidator must be set to "true" at compile time to enable QueryLiquidationTargets

Functions

func ApproxExponential 

func ApproxExponential(x sdk.Dec) sdk.Dec

ApproxExponential is the taylor series expansion of e^x centered around x=0, truncated to the cubic term. It can be used with great accuracy to determine e^x when x is very small. Note that e^x = 1 + x/1! + x^2/2! + x^3 / 3! + ...

func BorrowAPYInvariant 

func BorrowAPYInvariant(k Keeper) sdk.Invariant

BorrowAPYInvariant checks that Borrow APY have all positive values

func ComputeCloseFactor 

func ComputeCloseFactor(
	borrowedValue sdk.Dec,
	collateralValue sdk.Dec,
	liquidationThreshold sdk.Dec,
	smallLiquidationSize sdk.Dec,
	minimumCloseFactor sdk.Dec,
	completeLiquidationThreshold sdk.Dec,
) (closeFactor sdk.Dec)

ComputeCloseFactor derives the maximum portion of a borrower's current borrowedValue that can currently be repaid in a single liquidate transaction.

closeFactor scales linearly between minimumCloseFactor and 1.0, reaching its maximum when borrowedValue has reached a critical value between liquidationThreshold to collateralValue. This critical value is defined as: 

B = critical borrowedValue
C = collateralValue
L = liquidationThreshold
CLT = completeLiquidationThreshold

B = L + (C-L) * CLT

closeFactor is zero for borrowers that are not eligible for liquidation, i.e. borrowedValue < liquidationThreshold

Finally, if borrowedValue is less than smallLiquidationSize, closeFactor will always be 1 as long as the borrower is eligible for liquidation.

func ComputeLiquidation 

func ComputeLiquidation(
	availableRepay,
	availableCollateral,
	availableReward sdkmath.Int,
	repayTokenPrice,
	rewardTokenPrice,
	uTokenExchangeRate,
	liquidationIncentive,
	closeFactor,
	borrowedValue sdk.Dec,
) (tokenRepay sdkmath.Int, collateralBurn sdkmath.Int, tokenReward sdkmath.Int)

ComputeLiquidation takes the conditions preceding a liquidation and outputs the amounts of base token that should be repaid, collateral uToken burned, and reward token allocated as a result of the transaction, after accounting for limiting factors with as little rounding as possible. Inputs are as follows: - availableRepay: The lowest (in repay denom) of either liquidator balance, max repayment, or borrowed amount. - availableCollateral: The amount of the reward uToken denom which borrower has as collateral - availableReward: The amount of unreserved reward tokens in the module balance - repayTokenPrice: The oracle price of the base repayment denom - rewardTokenPrice: The oracle price of the base reward denom - uTokenExchangeRate: The uToken exchange rate from collateral uToken denom to reward base denom - liquidationIncentive: The liquidation incentive of the token reward denomination - closeFactor: The dynamic close factor computed from the borrower's borrowed value and liquidation threshold - borrowedValue: The borrower's borrowed value in USD

func ExchangeRatesInvariant 

func ExchangeRatesInvariant(k Keeper) sdk.Invariant

ExchangeRatesInvariant checks that all denoms have an uToken exchange rate >= 1

func InefficientBorrowAmountInvariant 

func InefficientBorrowAmountInvariant(k Keeper) sdk.Invariant

InefficientBorrowAmountInvariant checks that borrow amounts have all positive values This runs in O(N) time where N is the number of participating addresses, so it should not be enabled in production.

func InefficientCollateralAmountInvariant 

func InefficientCollateralAmountInvariant(k Keeper) sdk.Invariant

InefficientCollateralAmountInvariant checks that collateral amounts have all positive values. This runs in O(N) time where N is the number of participating addresses, so it should not be enabled in production.

func InterestScalarsInvariant 

func InterestScalarsInvariant(k Keeper) sdk.Invariant

InterestScalarsInvariant checks that all denoms have an interest scalar >= 1

func Interpolate 

func Interpolate(x, xMin, yMin, xMax, yMax sdk.Dec) sdk.Dec

Interpolate takes a line defined by two points (xMin, yMin) and (xMax, yMax), then finds the y-value of the point on that line for an input x-value. It will return yMin if xMin = xMax (i.e. a vertical line). While this function is intended for interpolation (xMin < x < xMax), it works correctly even when x is outside that range or when xMin > xMax.

func NewMsgServerImpl 

func NewMsgServerImpl(keeper Keeper) types.MsgServer

NewMsgServerImpl returns an implementation of MsgServer for the x/leverage module.

func RegisterInvariants 

func RegisterInvariants(ir sdk.InvariantRegistry, k Keeper)

RegisterInvariants registers the leverage module invariants

func ReserveAmountInvariant 

func ReserveAmountInvariant(k Keeper) sdk.Invariant

ReserveAmountInvariant checks that reserve amounts have non-negative balances

func SupplyAPYInvariant 

func SupplyAPYInvariant(k Keeper) sdk.Invariant

SupplyAPYInvariant checks that Supply APY have all positive values

Types

type Keeper 

type Keeper struct {
	// contains filtered or unexported fields
}

func NewKeeper 

func NewKeeper(
	cdc codec.Codec,
	storeKey storetypes.StoreKey,
	paramSpace paramtypes.Subspace,
	bk types.BankKeeper,
	ok types.OracleKeeper,
) (Keeper, error)

func (Keeper) AccrueAllInterest 

func (k Keeper) AccrueAllInterest(ctx sdk.Context) error

AccrueAllInterest is called by EndBlock to update borrow positions. It accrues interest on all open borrows, increase reserves, funds oracle rewards, and sets LastInterestTime to BlockTime.

func (Keeper) AvailableLiquidity 

func (k Keeper) AvailableLiquidity(ctx sdk.Context, denom string) sdkmath.Int

AvailableLiquidity gets the unreserved module balance of a given token.

func (Keeper) Borrow 

func (k Keeper) Borrow(ctx sdk.Context, borrowerAddr sdk.AccAddress, borrow sdk.Coin) error

Borrow attempts to borrow tokens from the leverage module account using collateral uTokens. If asset type is invalid, collateral is insufficient, or module balance is insufficient, we return an error.

func (Keeper) CalculateBorrowLimit 

func (k Keeper) CalculateBorrowLimit(ctx sdk.Context, collateral sdk.Coins) (sdk.Dec, error)

CalculateBorrowLimit uses the price oracle to determine the borrow limit (in USD) provided by collateral sdk.Coins, using each token's uToken exchange rate and collateral weight. An error is returned if any input coins are not uTokens or if value calculation fails.

func (Keeper) CalculateCollateralValue 

func (k Keeper) CalculateCollateralValue(ctx sdk.Context, collateral sdk.Coins) (sdk.Dec, error)

CalculateCollateralValue uses the price oracle to determine the value (in USD) provided by collateral sdk.Coins, using each token's uToken exchange rate. An error is returned if any input coins are not uTokens or if value calculation fails.

func (Keeper) CalculateLiquidationThreshold 

func (k Keeper) CalculateLiquidationThreshold(ctx sdk.Context, collateral sdk.Coins) (sdk.Dec, error)

CalculateLiquidationThreshold determines the maximum borrowed value (in USD) that a borrower with given collateral could reach before being eligible for liquidation, using each token's oracle price, uToken exchange rate, and liquidation threshold. An error is returned if any input coins are not uTokens or if value calculation fails.

func (Keeper) CollateralLiquidity 

func (k Keeper) CollateralLiquidity(ctx sdk.Context, denom string) sdk.Dec

CollateralLiquidity calculates the current collateral liquidity of a token denom, which is defined as the token's liquidity, divided by the base token equivalent of associated uToken's total collateral. Ranges from 0 to 1.0

func (*Keeper) CollateralShare 

func (k *Keeper) CollateralShare(ctx sdk.Context, denom string) (sdk.Dec, error)

CollateralShare calculates the portion of overall collateral (measured in USD value) that a given uToken denom represents.

func (Keeper) Collateralize 

func (k Keeper) Collateralize(ctx sdk.Context, borrowerAddr sdk.AccAddress, uToken sdk.Coin) error

Collateralize enables selected uTokens for use as collateral by a single borrower.

func (Keeper) Decollateralize 

func (k Keeper) Decollateralize(ctx sdk.Context, borrowerAddr sdk.AccAddress, uToken sdk.Coin) error

Decollateralize disables selected uTokens for use as collateral by a single borrower.

func (Keeper) DeriveBorrowAPY 

func (k Keeper) DeriveBorrowAPY(ctx sdk.Context, denom string) sdk.Dec

DeriveBorrowAPY derives the current borrow interest rate on a token denom using its supply utilization and token-specific params. Returns zero on invalid asset.

func (Keeper) DeriveExchangeRate 

func (k Keeper) DeriveExchangeRate(ctx sdk.Context, denom string) sdk.Dec

DeriveExchangeRate calculated the token:uToken exchange rate of a base token denom.

func (Keeper) DeriveSupplyAPY 

func (k Keeper) DeriveSupplyAPY(ctx sdk.Context, denom string) sdk.Dec

DeriveSupplyAPY derives the current supply interest rate on a token denom using its supply utilization and borrow APY. Returns zero on invalid asset.

func (Keeper) ExchangeToken 

func (k Keeper) ExchangeToken(ctx sdk.Context, token sdk.Coin) (sdk.Coin, error)

ExchangeToken converts an sdk.Coin containing a base asset to its value as a uToken.

func (Keeper) ExchangeUToken 

func (k Keeper) ExchangeUToken(ctx sdk.Context, uToken sdk.Coin) (sdk.Coin, error)

ExchangeUToken converts an sdk.Coin containing a uToken to its value in a base token.

func (Keeper) ExchangeUTokens 

func (k Keeper) ExchangeUTokens(ctx sdk.Context, uTokens sdk.Coins) (sdk.Coins, error)

ExchangeUTokens converts an sdk.Coins containing uTokens to their values in base tokens.

func (Keeper) ExportGenesis 

func (k Keeper) ExportGenesis(ctx sdk.Context) *types.GenesisState

ExportGenesis returns the x/leverage module's exported genesis state.

func (Keeper) FundOracle 

func (k Keeper) FundOracle(ctx sdk.Context, requested sdk.Coins) error

FundOracle transfers requested coins to the oracle module account, as long as the leverage module account has sufficient unreserved assets.

func (Keeper) GetAllRegisteredTokens 

func (k Keeper) GetAllRegisteredTokens(ctx sdk.Context) []types.Token

GetAllRegisteredTokens returns all the registered tokens from the x/leverage module's KVStore.

func (Keeper) GetAllReserves 

func (k Keeper) GetAllReserves(ctx sdk.Context) sdk.Coins

GetAllReserves returns all reserves.

func (Keeper) GetAllSupplied 

func (k Keeper) GetAllSupplied(ctx sdk.Context, supplierAddr sdk.AccAddress) (sdk.Coins, error)

GetAllSupplied returns the total tokens supplied by a user, including any interest accrued.

func (Keeper) GetAllTotalCollateral 

func (k Keeper) GetAllTotalCollateral(ctx sdk.Context) sdk.Coins

GetAllTotalCollateral returns total collateral across all uTokens.

func (Keeper) GetAllUTokenSupply 

func (k Keeper) GetAllUTokenSupply(ctx sdk.Context) sdk.Coins

GetAllUTokenSupply returns total supply of all uToken denoms.

func (Keeper) GetBorrow 

func (k Keeper) GetBorrow(ctx sdk.Context, borrowerAddr sdk.AccAddress, denom string) sdk.Coin

GetBorrow returns an sdk.Coin representing how much of a given denom a borrower currently owes.

func (Keeper) GetBorrowerBorrows 

func (k Keeper) GetBorrowerBorrows(ctx sdk.Context, borrowerAddr sdk.AccAddress) sdk.Coins

GetBorrowerBorrows returns an sdk.Coins object containing all open borrows associated with an address.

func (Keeper) GetBorrowerCollateral 

func (k Keeper) GetBorrowerCollateral(ctx sdk.Context, borrowerAddr sdk.AccAddress) sdk.Coins

GetBorrowerCollateral returns an sdk.Coins containing all of a borrower's collateral.

func (Keeper) GetCollateral 

func (k Keeper) GetCollateral(ctx sdk.Context, borrowerAddr sdk.AccAddress, denom string) sdk.Coin

GetCollateral returns an sdk.Coin representing how much of a given denom the x/leverage module account currently holds as collateral for a given borrower.

func (Keeper) GetEligibleLiquidationTargets 

func (k Keeper) GetEligibleLiquidationTargets(ctx sdk.Context) ([]sdk.AccAddress, error)

GetEligibleLiquidationTargets returns a list of borrower addresses eligible for liquidation.

func (Keeper) GetParams 

func (k Keeper) GetParams(ctx sdk.Context) (params types.Params)

GetParams gets the x/leverage module's parameters.

func (Keeper) GetReserves 

func (k Keeper) GetReserves(ctx sdk.Context, denom string) sdk.Coin

GetReserves gets the reserved amount of a specified token. On invalid asset, the reserved amount is zero.

func (Keeper) GetSupplied 

func (k Keeper) GetSupplied(ctx sdk.Context, supplierAddr sdk.AccAddress, denom string) (sdk.Coin, error)

GetSupplied returns an sdk.Coin representing how much of a given denom a user has supplied, including interest accrued.

func (Keeper) GetTokenSettings 

func (k Keeper) GetTokenSettings(ctx sdk.Context, denom string) (types.Token, error)

GetTokenSettings gets a token from the x/leverage module's KVStore.

func (Keeper) GetTotalBorrowed 

func (k Keeper) GetTotalBorrowed(ctx sdk.Context, denom string) sdk.Coin

GetTotalBorrowed returns the total borrowed in a given denom.

func (Keeper) GetTotalCollateral 

func (k Keeper) GetTotalCollateral(ctx sdk.Context, denom string) sdk.Coin

GetTotalCollateral returns an sdk.Coin representing how much of a given uToken the x/leverage module account currently holds as collateral. Non-uTokens return zero.

func (Keeper) GetTotalSupply 

func (k Keeper) GetTotalSupply(ctx sdk.Context, denom string) (sdk.Coin, error)

GetTotalSupply returns the total supplied by all suppliers in a given denom, including any interest accrued.

func (Keeper) GetUTokenSupply 

func (k Keeper) GetUTokenSupply(ctx sdk.Context, denom string) sdk.Coin

GetUTokenSupply gets the total supply of a specified utoken, as tracked by module state. On invalid asset or non-uToken, the supply is zero.

func (Keeper) HasCollateral 

func (k Keeper) HasCollateral(ctx sdk.Context, borrowerAddr sdk.AccAddress) bool

HasCollateral returns true if a borrower has any collateral.

func (Keeper) InitGenesis 

func (k Keeper) InitGenesis(ctx sdk.Context, genState types.GenesisState)

InitGenesis initializes the x/leverage module state from a provided genesis state.

func (Keeper) Liquidate 

func (k Keeper) Liquidate(
	ctx sdk.Context, liquidatorAddr, borrowerAddr sdk.AccAddress, maxRepay sdk.Coin, rewardDenom string,
) (repaid sdk.Coin, liquidated sdk.Coin, reward sdk.Coin, err error)

Liquidate attempts to repay one of an eligible borrower's borrows (in part or in full) in exchange for some of the borrower's uToken collateral or associated base tokens. If the borrower is not over their liquidation limit, or the repayment or reward denominations are invalid, an error is returned. If the attempted repayment is greater than the amount owed or the maximum that can be repaid due to parameters or available balances, then a partial liquidation, equal to the maximum valid amount, is performed. Because partial liquidation is possible and exchange rates vary, Liquidate returns the actual amount of tokens repaid, collateral liquidated, and base tokens or uTokens rewarded.

func (Keeper) Logger 

func (k Keeper) Logger(ctx sdk.Context) log.Logger

func (Keeper) ModuleBalance 

func (k Keeper) ModuleBalance(ctx sdk.Context, denom string) sdk.Coin

ModuleBalance returns the amount of a given token held in the x/leverage module account

func (Keeper) PriceRatio 

func (k Keeper) PriceRatio(ctx sdk.Context, fromDenom, toDenom string) (sdk.Dec, error)

PriceRatio computed the ratio of the USD prices of two tokens, as sdk.Dec(fromPrice/toPrice). Will return an error if either token price is not positive, and guarantees a positive output.

func (Keeper) Repay 

func (k Keeper) Repay(ctx sdk.Context, borrowerAddr sdk.AccAddress, payment sdk.Coin) (sdk.Coin, error)

Repay attempts to repay a borrow position. If asset type is invalid, account balance is insufficient, or borrower has no borrows in payment denom to repay, we return an error. Additionally, if the amount provided is greater than the full repayment amount, only the necessary amount is transferred. Because amount repaid may be less than the repayment attempted, Repay returns the actual amount repaid.

func (Keeper) RepayBadDebt 

func (k Keeper) RepayBadDebt(ctx sdk.Context, borrowerAddr sdk.AccAddress, denom string) (bool, error)

RepayBadDebt uses reserves to repay borrower's debts of a given denom. It returns a boolean representing whether full repayment was achieved. This function assumes the borrower has already been verified to have no collateral remaining.

func (*Keeper) SetHooks 

func (k *Keeper) SetHooks(h types.Hooks) *Keeper

SetHooks sets the module's hooks. Note, hooks can only be set once.

func (Keeper) SetParams 

func (k Keeper) SetParams(ctx sdk.Context, params types.Params)

SetParams sets the x/leverage module's parameters.

func (Keeper) SetTokenSettings 

func (k Keeper) SetTokenSettings(ctx sdk.Context, token types.Token) error

SetTokenSettings stores a Token into the x/leverage module's KVStore.

func (Keeper) Supply 

func (k Keeper) Supply(ctx sdk.Context, supplierAddr sdk.AccAddress, coin sdk.Coin) (sdk.Coin, error)

Supply attempts to deposit assets into the leverage module account in exchange for uTokens. If asset type is invalid or account balance is insufficient, we return an error. Returns the amount of uTokens minted.

func (Keeper) SupplyUtilization 

func (k Keeper) SupplyUtilization(ctx sdk.Context, denom string) sdk.Dec

SupplyUtilization calculates the current supply utilization of a token denom.

func (Keeper) SweepBadDebts 

func (k Keeper) SweepBadDebts(ctx sdk.Context) error

SweepBadDebts attempts to repay all bad debts in the system.

func (Keeper) TokenPrice 

func (k Keeper) TokenPrice(ctx sdk.Context, denom string) (sdk.Dec, error)

TokenPrice returns the USD value of a base token. Note, the token's denomination must be the base denomination, e.g. uumee. The x/oracle module must know of the base and display/symbol denominations for each exchange pair. E.g. it must know about the UMEE/USD exchange rate along with the uumee base denomination and the exponent. When error is nil, price is guaranteed to be positive.

func (Keeper) TokenValue 

func (k Keeper) TokenValue(ctx sdk.Context, coin sdk.Coin) (sdk.Dec, error)

TokenValue returns the total token value given a Coin. An error is returned if we cannot get the token's price or if it's not an accepted token.

func (Keeper) TotalTokenValue 

func (k Keeper) TotalTokenValue(ctx sdk.Context, coins sdk.Coins) (sdk.Dec, error)

TotalTokenValue returns the total value of all supplied tokens. It is equivalent to the sum of TokenValue on each coin individually, except it ignores unregistered and blacklisted tokens instead of returning an error.

func (Keeper) Withdraw 

func (k Keeper) Withdraw(ctx sdk.Context, supplierAddr sdk.AccAddress, uToken sdk.Coin) (sdk.Coin, error)

Withdraw attempts to redeem uTokens from the leverage module in exchange for base tokens. If there are not enough uTokens in balance, Withdraw will attempt to withdraw uToken collateral to make up the difference (as long as borrow limit allows). If the uToken denom is invalid or balances are insufficient to withdraw the full amount requested, returns an error. Returns the amount of base tokens received.

type Querier 

type Querier struct {
	Keeper
}

Querier implements a QueryServer for the x/leverage module.

func NewQuerier 

func NewQuerier(k Keeper) Querier

func (Querier) AccountBalances 

func (q Querier) AccountBalances(
	goCtx context.Context,
	req *types.QueryAccountBalances,
) (*types.QueryAccountBalancesResponse, error)

func (Querier) AccountSummary 

func (q Querier) AccountSummary(
	goCtx context.Context,
	req *types.QueryAccountSummary,
) (*types.QueryAccountSummaryResponse, error)

func (Querier) BadDebts 

func (q Querier) BadDebts(
	goCtx context.Context,
	req *types.QueryBadDebts,
) (*types.QueryBadDebtsResponse, error)

func (Querier) LiquidationTargets 

func (q Querier) LiquidationTargets(
	goCtx context.Context,
	req *types.QueryLiquidationTargets,
) (*types.QueryLiquidationTargetsResponse, error)

func (Querier) MarketSummary 

func (q Querier) MarketSummary(
	goCtx context.Context,
	req *types.QueryMarketSummary,
) (*types.QueryMarketSummaryResponse, error)

func (Querier) Params 

func (q Querier) Params(
	goCtx context.Context,
	req *types.QueryParams,
) (*types.QueryParamsResponse, error)

func (Querier) RegisteredTokens 

func (q Querier) RegisteredTokens(
	goCtx context.Context,
	req *types.QueryRegisteredTokens,
) (*types.QueryRegisteredTokensResponse, error)

Source Files

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