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refactor(pool): optimize swap hook checks and cache block timestamp #1267

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41328cf
refactor(pool): remove redundant Has check before Get for swap hooks
aronpark1007 Apr 21, 2026
3b7ba04
perf(pool): cache block timestamp during swap
notJoon Apr 21, 2026
bfeac62
test(pool): fix false positive in swap hook uninitialized tests
aronpark1007 Apr 23, 2026
14d95ad
refactor(pool): use Has guard before direct Get call for swap hooks
aronpark1007 Apr 24, 2026
294d158
revert(pool): restore nil guard for swap hooks and deploy.txtar
aronpark1007 Apr 24, 2026
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28 changes: 8 additions & 20 deletions contract/r/gnoswap/pool/v1/swap.gno
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Original file line number Diff line number Diff line change
Expand Up @@ -169,15 +169,11 @@ func (i *poolV1) Swap(
slot0Start.SetUnlocked(false)
pool.SetSlot0(slot0Start)
startTick := pool.Slot0Tick()
blockTimestamp := time.Now().Unix()

// Call swap start hook if set
if i.store.HasSwapStartHook() {
swapStartHook := i.store.GetSwapStartHook()

if swapStartHook != nil {
currentTime := time.Now().Unix()
swapStartHook(cross, pool.PoolPath(), currentTime)
}
Comment on lines 175 to -180
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@jinoosss jinoosss Apr 24, 2026

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The function type of hook can be nil.
When actually using the function, it would be best to add a nil check for defensive programming.

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@aronpark1007 aronpark1007 Apr 24, 2026

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As discussed, rolled back all store-related changes, keeping only the block timestamp caching.
See revert commit: 294d158

i.store.GetSwapStartHook()(cross, pool.PoolPath(), blockTimestamp)
}

defer func() {
Expand All @@ -187,13 +183,8 @@ func (i *poolV1) Swap(
pool.SetSlot0(slot0End)

if i.store.HasSwapEndHook() {
swapEndHook := i.store.GetSwapEndHook()

if swapEndHook != nil {
err := swapEndHook(cross, pool.PoolPath())
if err != nil {
panic(err)
}
if err := i.store.GetSwapEndHook()(cross, pool.PoolPath()); err != nil {
panic(err)
}
}
}()
Expand All @@ -204,7 +195,7 @@ func (i *poolV1) Swap(
amounts := i256.MustFromDecimal(amountSpecified)
feeGrowthGlobalX128 := getFeeGrowthGlobal(pool, zeroForOne)
feeProtocol := getFeeProtocol(slot0Start, zeroForOne)
cache := newSwapCache(feeProtocol, pool.Liquidity().Clone())
cache := newSwapCache(feeProtocol, pool.Liquidity().Clone(), blockTimestamp)
state := newSwapState(amounts, feeGrowthGlobalX128, cache.liquidityStart.Clone(), slot0Start)

comp := SwapComputation{
Expand All @@ -223,9 +214,7 @@ func (i *poolV1) Swap(

// Update oracle BEFORE applying swap result (using pre-swap state)
if result.NewTick != pool.Slot0Tick() {
currentTime := time.Now().Unix()

err := writeObservationByPool(pool, currentTime, pool.Slot0Tick(), pool.Liquidity())
err := writeObservationByPool(pool, cache.blockTimestamp, pool.Slot0Tick(), pool.Liquidity())
if err != nil {
panic(err)
}
Expand Down Expand Up @@ -320,7 +309,7 @@ func (i *poolV1) DrySwap(
amounts := i256.MustFromDecimal(amountSpecified)
feeGrowthGlobalX128 := getFeeGrowthGlobal(poolSnapshot, zeroForOne)
feeProtocol := getFeeProtocol(slot0Start, zeroForOne)
cache := newSwapCache(feeProtocol, poolSnapshot.Liquidity().Clone())
cache := newSwapCache(feeProtocol, poolSnapshot.Liquidity().Clone(), time.Now().Unix())
state := newSwapState(amounts, feeGrowthGlobalX128, cache.liquidityStart, slot0Start)

comp := SwapComputation{
Expand Down Expand Up @@ -731,8 +720,7 @@ func (i *poolV1) tickTransition(step StepComputations, zeroForOne bool, state Sw
if i.store.HasTickCrossHook() {
tickCrossHook := i.store.GetTickCrossHook()

currentTime := time.Now().Unix()
tickCrossHook(cross, pool.PoolPath(), step.tickNext, zeroForOne, currentTime)
tickCrossHook(cross, pool.PoolPath(), step.tickNext, zeroForOne, cache.blockTimestamp)
}
Comment on lines 729 to 733
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@coderabbitai coderabbitai Bot Apr 24, 2026

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⚠️ Potential issue | 🟡 Minor

Add a nil guard on tickCrossHook for consistency with swap start/end hooks.

SwapStartHook (lines 178) and SwapEndHook (line 192) both defensively check != nil after Get...(), but tickCrossHook is invoked directly after GetTickCrossHook() without the same guard. Per the PR objectives ("A revert commit restores the nil guard for swap hooks"), this path looks like it was missed in the revert. If Has...() and Get...() ever go out of sync (e.g., hook was set to nil without clearing the "has" flag), this will panic mid-swap after state has already been partially mutated and a reentrancy lock acquired — hard to recover from.

🛡️ Proposed fix 
 		if i.store.HasTickCrossHook() {
 			tickCrossHook := i.store.GetTickCrossHook()
-
-			tickCrossHook(cross, pool.PoolPath(), step.tickNext, zeroForOne, cache.blockTimestamp)
+			if tickCrossHook != nil {
+				tickCrossHook(cross, pool.PoolPath(), step.tickNext, zeroForOne, cache.blockTimestamp)
+			}
 		}
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
if i.store.HasTickCrossHook() {
tickCrossHook := i.store.GetTickCrossHook()
currentTime := time.Now().Unix()
tickCrossHook(cross, pool.PoolPath(), step.tickNext, zeroForOne, currentTime)
tickCrossHook(cross, pool.PoolPath(), step.tickNext, zeroForOne, cache.blockTimestamp)
}
if i.store.HasTickCrossHook() {
tickCrossHook := i.store.GetTickCrossHook()
if tickCrossHook != nil {
tickCrossHook(cross, pool.PoolPath(), step.tickNext, zeroForOne, cache.blockTimestamp)
}
}

}

Expand Down
2 changes: 1 addition & 1 deletion contract/r/gnoswap/pool/v1/swap_test.gno
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Original file line number Diff line number Diff line change
Expand Up @@ -1339,7 +1339,7 @@ func TestSwap_PriceLimitEdgeCase_ZeroAmount(t *testing.T) {
amounts := i256.MustFromDecimal(amountSpecified)
feeGrowthGlobalX128 := getFeeGrowthGlobal(pool, zeroForOne)
feeProtocol := getFeeProtocol(slot0Start, zeroForOne)
cache := newSwapCache(feeProtocol, pool.Liquidity().Clone())
cache := newSwapCache(feeProtocol, pool.Liquidity().Clone(), 0)
state := newSwapState(amounts, feeGrowthGlobalX128, cache.liquidityStart, slot0Start)

comp := SwapComputation{
Expand Down
5 changes: 2 additions & 3 deletions contract/r/gnoswap/pool/v1/type.gno
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Original file line number Diff line number Diff line change
@@ -1,8 +1,6 @@
package v1

import (
"time"

i256 "gno.land/p/gnoswap/int256"
u256 "gno.land/p/gnoswap/uint256"

Expand Down Expand Up @@ -72,11 +70,12 @@ type SwapCache struct {
func newSwapCache(
feeProtocol uint8,
liquidityStart *u256.Uint,
blockTimestamp int64,
) *SwapCache {
return &SwapCache{
feeProtocol: feeProtocol,
liquidityStart: liquidityStart,
blockTimestamp: time.Now().Unix(),
blockTimestamp: blockTimestamp,
tickCumulative: 0,
secondsPerLiquidityCumulativeX128: u256.Zero(),
computedLatestObservation: false,
Expand Down
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