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calc_exit_pool.go
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calc_exit_pool.go
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package types
import (
"errors"
fmt "fmt"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
)
func CalcExitValueWithoutSlippage(ctx sdk.Context, oracleKeeper OracleKeeper, accPoolKeeper AccountedPoolKeeper, pool Pool, exitingShares sdk.Int, tokenOutDenom string) (sdk.Dec, error) {
tvl, err := pool.TVL(ctx, oracleKeeper)
if err != nil {
return sdk.ZeroDec(), err
}
totalShares := pool.GetTotalShares()
var refundedShares sdk.Dec
refundedShares = sdk.NewDecFromInt(exitingShares)
exitValue := tvl.Mul(refundedShares).Quo(sdk.NewDecFromInt(totalShares.Amount))
if exitingShares.GTE(totalShares.Amount) {
return sdk.ZeroDec(), sdkerrors.Wrapf(ErrLimitMaxAmount, ErrMsgFormatSharesLargerThanMax, exitingShares, totalShares)
}
return exitValue, nil
// Note: Disable slippage handling for oracle pool due to 1 hour lockup on oracle lp
// shareOutRatio := refundedShares.QuoInt(totalShares.Amount)
// // exitedCoins = shareOutRatio * pool liquidity
// exitedCoins := sdk.Coins{}
// poolLiquidity := pool.GetTotalPoolLiquidity()
// for _, asset := range poolLiquidity {
// // round down here, due to not wanting to over-exit
// exitAmt := shareOutRatio.MulInt(asset.Amount).TruncateInt()
// if exitAmt.LTE(sdk.ZeroInt()) {
// continue
// }
// if exitAmt.GTE(asset.Amount) {
// return sdk.ZeroDec(), errors.New("too many shares out")
// }
// exitedCoins = exitedCoins.Add(sdk.NewCoin(asset.Denom, exitAmt))
// }
// slippageValue := sdk.ZeroDec()
// for _, exitedCoin := range exitedCoins {
// if exitedCoin.Denom == tokenOutDenom {
// continue
// }
// inTokenPrice := oracleKeeper.GetAssetPriceFromDenom(ctx, exitedCoin.Denom)
// if inTokenPrice.IsZero() {
// return sdk.ZeroDec(), fmt.Errorf("token price not set: %s", exitedCoin.Denom)
// }
// resizedAmount := sdk.NewDecFromInt(exitedCoin.Amount).
// Quo(pool.PoolParams.ExternalLiquidityRatio).RoundInt()
// slippageAmount, err := pool.CalcGivenInSlippage(
// ctx,
// oracleKeeper,
// &pool,
// sdk.Coins{sdk.NewCoin(exitedCoin.Denom, resizedAmount)},
// tokenOutDenom,
// accPoolKeeper,
// )
// if err != nil {
// return sdk.ZeroDec(), err
// }
// slippageValue = slippageValue.Add(slippageAmount.Mul(inTokenPrice))
// }
// exitValueWithoutSlippage := exitValue.Sub(slippageValue)
// return exitValueWithoutSlippage, nil
}
// CalcExitPool returns how many tokens should come out, when exiting k LP shares against a "standard" CFMM
func CalcExitPool(ctx sdk.Context, oracleKeeper OracleKeeper, pool Pool, accountedPoolKeeper AccountedPoolKeeper, exitingShares sdk.Int, tokenOutDenom string) (sdk.Coins, error) {
totalShares := pool.GetTotalShares()
if exitingShares.GTE(totalShares.Amount) {
return sdk.Coins{}, sdkerrors.Wrapf(ErrLimitMaxAmount, ErrMsgFormatSharesLargerThanMax, exitingShares, totalShares)
}
// refundedShares = exitingShares * (1 - exit fee)
// with 0 exit fee optimization
var refundedShares sdk.Dec
refundedShares = sdk.NewDecFromInt(exitingShares)
shareOutRatio := refundedShares.QuoInt(totalShares.Amount)
// exitedCoins = shareOutRatio * pool liquidity
exitedCoins := sdk.Coins{}
poolLiquidity := pool.GetTotalPoolLiquidity()
if pool.PoolParams.UseOracle && tokenOutDenom != "" {
initialWeightDistance := pool.WeightDistanceFromTarget(ctx, oracleKeeper, pool.PoolAssets)
tokenPrice := oracleKeeper.GetAssetPriceFromDenom(ctx, tokenOutDenom)
exitValueWithoutSlippage, err := CalcExitValueWithoutSlippage(ctx, oracleKeeper, accountedPoolKeeper, pool, exitingShares, tokenOutDenom)
if err != nil {
return sdk.Coins{}, err
}
oracleOutAmount := exitValueWithoutSlippage.Quo(tokenPrice)
newAssetPools, err := pool.NewPoolAssetsAfterSwap(
sdk.Coins{},
sdk.Coins{sdk.NewCoin(tokenOutDenom, oracleOutAmount.RoundInt())},
)
if err != nil {
return sdk.Coins{}, err
}
for _, asset := range newAssetPools {
if asset.Token.Amount.IsNegative() {
return sdk.Coins{}, fmt.Errorf("out amount exceeds liquidity balance")
}
}
weightDistance := pool.WeightDistanceFromTarget(ctx, oracleKeeper, newAssetPools)
distanceDiff := weightDistance.Sub(initialWeightDistance)
weightBreakingFee := sdk.ZeroDec()
if distanceDiff.IsPositive() {
weightBreakingFee = pool.PoolParams.WeightBreakingFeeMultiplier.Mul(distanceDiff)
}
tokenOutAmount := oracleOutAmount.Mul(sdk.OneDec().Sub(weightBreakingFee)).RoundInt()
return sdk.Coins{sdk.NewCoin(tokenOutDenom, tokenOutAmount)}, nil
}
for _, asset := range poolLiquidity {
// round down here, due to not wanting to over-exit
exitAmt := shareOutRatio.MulInt(asset.Amount).TruncateInt()
if exitAmt.LTE(sdk.ZeroInt()) {
continue
}
if exitAmt.GTE(asset.Amount) {
return sdk.Coins{}, errors.New("too many shares out")
}
exitedCoins = exitedCoins.Add(sdk.NewCoin(asset.Denom, exitAmt))
}
return exitedCoins, nil
}