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Remove iterator calls in two CL operations #7499

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Feb 16, 2024
Merged

Remove iterator calls in two CL operations #7499

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aaef4a3
Remove iterator calls in two CL operations
ValarDragon Feb 16, 2024
0e5e50e
add changelog
ValarDragon Feb 16, 2024
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -45,6 +45,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
### State Breaking

* [#7250](https://github.com/osmosis-labs/osmosis/pull/7250) Further filter spam gauges from epoch distribution.
* [#7499](https://github.com/osmosis-labs/osmosis/pull/7499) Slight speed/gas improvements to CL CreatePosition and AddToPosition

## v23.0.0

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19 changes: 10 additions & 9 deletions x/concentrated-liquidity/lp.go
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Expand Up @@ -94,10 +94,8 @@ func (k Keeper) CreatePosition(ctx sdk.Context, poolId uint64, owner sdk.AccAddr

// If this is the first position created in this pool, ensure that the position includes both asset0 and asset1
// in order to assign an initial spot price.
hasPositions, err := k.HasAnyPositionForPool(ctx, poolId)
if err != nil {
return CreatePositionData{}, err
}
// N.B. the pool is not mutated between fetching and this call.
hasPositions := k.PoolHasPosition(ctx, pool)

// Trigger before hook for CreatePosition prior to mutating state.
// If no contract is set, this will be a no-op.
Expand Down Expand Up @@ -307,6 +305,11 @@ func (k Keeper) WithdrawPosition(ctx sdk.Context, owner sdk.AccAddress, position
return osmomath.Int{}, osmomath.Int{}, err
}

// Note that here we currently use the iterator based definition to search
// for a remaining position in the pool. Since we have removed a position we need to
// search if there are more.
// Ideally in the future we could have a simple "num positions" counter to make this logic
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Do you mean adding a state entry for num positions where key is address and value is num positions?

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Yes! But key is poolID

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ah right pool id. Would the speedup of using num counter be worthy for making an github issue and coming back to it to address it?

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I think so, but there are other higher priorities in the CL performance line of work.

// much faster.
anyPositionsRemainingInPool, err := k.HasAnyPositionForPool(ctx, position.PoolId)
if err != nil {
return osmomath.Int{}, osmomath.Int{}, err
Expand Down Expand Up @@ -417,22 +420,20 @@ func (k Keeper) addToPosition(ctx sdk.Context, owner sdk.AccAddress, positionId
return 0, osmomath.Int{}, osmomath.Int{}, err
}

anyPositionsRemainingInPool, err := k.HasAnyPositionForPool(ctx, position.PoolId)
pool, err := k.GetConcentratedPoolById(ctx, position.PoolId)
if err != nil {
return 0, osmomath.Int{}, osmomath.Int{}, err
}

anyPositionsRemainingInPool := k.PoolHasPosition(ctx, pool)
Comment on lines +423 to +428
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Does this also give us speed up compared to calling HasAnyPositionForPool directly?

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Yes! HasAnyPositionForPool runs an iterator. PoolHasPosition just checks data off the pool struct directly

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If so, isn't it also possible to change HasAnyPositionForPool to do GetConcentratedPoolById then call PoolHasPosition instead of running an iterator?

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@ValarDragon ValarDragon Feb 16, 2024 •
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yeah, it was mostly that we still need the old method as well for withdraw position.

Maybe we rename this

if !anyPositionsRemainingInPool {
return 0, osmomath.Int{}, osmomath.Int{}, types.AddToLastPositionInPoolError{PoolId: position.PoolId, PositionId: position.PositionId}
}

// Create new position with updated liquidity.
amount0Desired := amount0Withdrawn.Add(amount0Added)
amount1Desired := amount1Withdrawn.Add(amount1Added)
pool, err := k.GetConcentratedPoolById(ctx, position.PoolId)
if err != nil {
return 0, osmomath.Int{}, osmomath.Int{}, err
}

tokensProvided := sdk.NewCoins(sdk.NewCoin(pool.GetToken0(), amount0Desired), sdk.NewCoin(pool.GetToken1(), amount1Desired))
minimumAmount0 := amount0Withdrawn
minimumAmount1 := amount1Withdrawn
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