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Clarify error message when you try to completely exit a pool #5165

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merged 2 commits into from
May 12, 2023
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Clarify error message when you try to completely exit a pool #5165

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ffc821a
Clarify error message when you try to completely exit a pool
ValarDragon May 12, 2023
89a5461
Add changelog
ValarDragon May 12, 2023
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -66,6 +66,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
* [#4974](https://github.com/osmosis-labs/osmosis/pull/4974) Add lock id to `MsgSuperfluidUndelegateAndUnbondLockResponse`
* [#2741](https://github.com/osmosis-labs/osmosis/pull/2741) Prevent updating the twap record if `ctx.BlockTime <= record.Time` or `ctx.BlockHeight <= record.Height`. Exception, can update the record created when creating the pool in the same block.
* [#5129](https://github.com/osmosis-labs/osmosis/pull/5129) Relax twap record validation in init genesis to allow one of the spot prices to be non-zero when twap error is observed.
* [#5165](https://github.com/osmosis-labs/osmosis/pull/5165) Improve error message when fully exiting from a pool.

### API breaks

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4 changes: 2 additions & 2 deletions x/gamm/pool-models/internal/cfmm_common/lp.go
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Expand Up @@ -11,13 +11,13 @@ import (
"github.com/osmosis-labs/osmosis/v15/x/gamm/types"
)

const errMsgFormatSharesLargerThanMax = "%s resulted shares is larger than the max amount of %s"
const errMsgFormatSharesLargerThanMax = "cannot exit all shares in a pool. Attempted to exit %s shares, max allowed is %s"

// CalcExitPool returns how many tokens should come out, when exiting k LP shares against a "standard" CFMM
func CalcExitPool(ctx sdk.Context, pool types.CFMMPoolI, exitingShares sdk.Int, exitFee sdk.Dec) (sdk.Coins, error) {
totalShares := pool.GetTotalShares()
if exitingShares.GTE(totalShares) {
return sdk.Coins{}, errorsmod.Wrapf(types.ErrLimitMaxAmount, errMsgFormatSharesLargerThanMax, exitingShares, totalShares)
return sdk.Coins{}, errorsmod.Wrapf(types.ErrLimitMaxAmount, errMsgFormatSharesLargerThanMax, exitingShares, totalShares.Sub(sdk.OneInt()))
}

// refundedShares = exitingShares * (1 - exit fee)
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