mirror of
https://github.com/0glabs/0g-chain.git
synced 2024-12-29 17:55:19 +00:00
76 lines
2.8 KiB
Go
76 lines
2.8 KiB
Go
package keeper
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
errorsmod "cosmossdk.io/errors"
|
|
sdkmath "cosmossdk.io/math"
|
|
sdk "github.com/cosmos/cosmos-sdk/types"
|
|
|
|
"github.com/0glabs/0g-chain/x/swap/types"
|
|
)
|
|
|
|
// Withdraw removes liquidity from an existing pool from an owners deposit, converting the provided shares for
|
|
// the returned pool liquidity.
|
|
//
|
|
// If 100% of the owners shares are removed, then the deposit is deleted. In addition, if all the pool shares
|
|
// are removed then the pool is deleted.
|
|
//
|
|
// The number of shares must be large enough to result in at least 1 unit of the smallest reserve in the pool.
|
|
// If the share input is below the minimum required for positive liquidity to be remove from both reserves, a
|
|
// insufficient error is returned.
|
|
//
|
|
// In addition, if the withdrawn liquidity for each reserve is below the provided minimum, a slippage exceeded
|
|
// error is returned.
|
|
func (k Keeper) Withdraw(ctx sdk.Context, owner sdk.AccAddress, shares sdkmath.Int, minCoinA, minCoinB sdk.Coin) error {
|
|
poolID := types.PoolID(minCoinA.Denom, minCoinB.Denom)
|
|
|
|
shareRecord, found := k.GetDepositorShares(ctx, owner, poolID)
|
|
if !found {
|
|
return errorsmod.Wrapf(types.ErrDepositNotFound, "no deposit for account %s and pool %s", owner, poolID)
|
|
}
|
|
|
|
if shares.GT(shareRecord.SharesOwned) {
|
|
return errorsmod.Wrapf(types.ErrInvalidShares, "withdraw of %s shares greater than %s shares owned", shares, shareRecord.SharesOwned)
|
|
}
|
|
|
|
poolRecord, found := k.GetPool(ctx, poolID)
|
|
if !found {
|
|
panic(fmt.Sprintf("pool %s not found", poolID))
|
|
}
|
|
|
|
pool, err := types.NewDenominatedPoolWithExistingShares(poolRecord.Reserves(), poolRecord.TotalShares)
|
|
if err != nil {
|
|
panic(fmt.Sprintf("invalid pool %s: %s", poolID, err))
|
|
}
|
|
|
|
withdrawnAmount := pool.RemoveLiquidity(shares)
|
|
if withdrawnAmount.AmountOf(minCoinA.Denom).IsZero() || withdrawnAmount.AmountOf(minCoinB.Denom).IsZero() {
|
|
return errorsmod.Wrap(types.ErrInsufficientLiquidity, "shares must be increased")
|
|
}
|
|
if withdrawnAmount.AmountOf(minCoinA.Denom).LT(minCoinA.Amount) || withdrawnAmount.AmountOf(minCoinB.Denom).LT(minCoinB.Amount) {
|
|
return errorsmod.Wrap(types.ErrSlippageExceeded, "minimum withdraw not met")
|
|
}
|
|
|
|
k.updatePool(ctx, poolID, pool)
|
|
k.BeforePoolDepositModified(ctx, poolID, owner, shareRecord.SharesOwned)
|
|
k.updateDepositorShares(ctx, owner, poolID, shareRecord.SharesOwned.Sub(shares))
|
|
|
|
err = k.bankKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleAccountName, owner, withdrawnAmount)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
ctx.EventManager().EmitEvent(
|
|
sdk.NewEvent(
|
|
types.EventTypeSwapWithdraw,
|
|
sdk.NewAttribute(types.AttributeKeyPoolID, poolID),
|
|
sdk.NewAttribute(types.AttributeKeyOwner, owner.String()),
|
|
sdk.NewAttribute(sdk.AttributeKeyAmount, withdrawnAmount.String()),
|
|
sdk.NewAttribute(types.AttributeKeyShares, shares.String()),
|
|
),
|
|
)
|
|
|
|
return nil
|
|
}
|