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Convert sdk.Int to BigDec #6409

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merged 17 commits into from
Sep 20, 2023
Merged

Convert sdk.Int to BigDec #6409

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refactor/test(CL): Stricter rounding behavior in CL math methods; uni…
p0mvn Sep 11, 2023
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comment updates
p0mvn Sep 11, 2023
cb6f73d
convert int => bigdec instead of int => dec => bigdec
hieuvubk Sep 14, 2023
938436d
tests
hieuvubk Sep 14, 2023
341f982
Liquidity1 lack
hieuvubk Sep 14, 2023
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merge main
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add changelog endpoint
hieuvubk Sep 16, 2023
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Merge branch 'main' into hieu/bigdec_from_sdk_int
hieuvubk Sep 18, 2023
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update go mod
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Merge branch 'main' into hieu/bigdec_from_sdk_int
p0mvn Sep 18, 2023
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keep comments
hieuvubk Sep 18, 2023
a574e39
Merge branch 'hieu/bigdec_from_sdk_int' of https://github.com/osmosis…
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merge main
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go mod
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fix
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Merge branch 'main' into hieu/bigdec_from_sdk_int
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Update CHANGELOG.md
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6 changes: 6 additions & 0 deletions osmomath/decimal.go
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Original file line number Diff line number Diff line change
Expand Up @@ -582,6 +582,12 @@ func BigDecFromDec(d Dec) BigDec {
return NewBigDecFromBigIntWithPrec(d.BigInt(), PrecisionDec)
}

// BigDecFromSDKInt returns the BigDec representation of an sdkInt.
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nit: I think we do not reference sdk anymore, Int is defined in osmomath package

Suggested change
// BigDecFromSDKInt returns the BigDec representation of an sdkInt.
// BigDecFromSDKInt returns the BigDec representation of an Int.

// Values in any additional decimal places are truncated.
func BigDecFromSDKInt(i Int) BigDec {
return NewBigDecFromBigIntWithPrec(i.BigInt(), 0)
}
Comment on lines +587 to +589
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Note that this is not mutative. See that BigInt() reinitializes the underlying buffer.

Let's still keep this, please. However, I'm also wondering if we can make a mutative version that would reuse the input's buffer?

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Yeah I see, currently it's hard to access Int.i directly without BigInt()

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Could you make an issue to consider this in the future and potentially talk to the SDK team about exposing such API?

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Created an issue for tracking #17772

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I tried returning Int.i in my local, performance is improved but the potential risks are unclear


// BigDecFromDecSlice returns the []BigDec representation of an []Dec.
// Values in any additional decimal places are truncated.
func BigDecFromDecSlice(ds []Dec) []BigDec {
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21 changes: 21 additions & 0 deletions osmomath/decimal_test.go
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Expand Up @@ -295,6 +295,27 @@ func (s *decimalTestSuite) TestBigDecFromSdkDec() {
}
}

func (s *decimalTestSuite) TestBigDecFromSdkInt() {
tests := []struct {
i osmomath.Int
want osmomath.BigDec
expPanic bool
}{
{osmomath.ZeroInt(), osmomath.NewBigDec(0), false},
{osmomath.OneInt(), osmomath.NewBigDec(1), false},
{osmomath.NewInt(10), osmomath.NewBigDec(10), false},
{osmomath.NewInt(10090090090090090), osmomath.NewBigDecWithPrec(10090090090090090, 0), false},
}
for tcIndex, tc := range tests {
if tc.expPanic {
s.Require().Panics(func() { osmomath.BigDecFromSDKInt(tc.i) })
} else {
value := osmomath.BigDecFromSDKInt(tc.i)
s.Require().Equal(tc.want, value, "bad osmomath.BigDecFromDec(), index: %v", tcIndex)
}
}
}

func (s *decimalTestSuite) TestBigDecFromSdkDecSlice() {
tests := []struct {
d []osmomath.Dec
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6 changes: 2 additions & 4 deletions x/concentrated-liquidity/math/math.go
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Expand Up @@ -18,8 +18,7 @@ func Liquidity0(amount osmomath.Int, sqrtPriceA, sqrtPriceB osmomath.BigDec) osm

// We convert to BigDec to avoid precision loss when calculating liquidity. Without doing this,
// our liquidity calculations will be off from our theoretical calculations within our tests.
// TODO (perf): consider better conversion helpers to minimize reallocations.
amountBigDec := osmomath.BigDecFromDec(amount.ToLegacyDec())
amountBigDec := osmomath.BigDecFromSDKInt(amount)
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Let's keep these comments please.

Do you mint creating an issue for this osmosis side and linking it to cosmos/cosmos-sdk#17772?

Thanks!

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Sure!

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#6429


product := sqrtPriceA.Mul(sqrtPriceB)
diff := sqrtPriceB.Sub(sqrtPriceA)
Expand All @@ -42,8 +41,7 @@ func Liquidity1(amount osmomath.Int, sqrtPriceA, sqrtPriceB osmomath.BigDec) osm

// We convert to BigDec to avoid precision loss when calculating liquidity. Without doing this,
// our liquidity calculations will be off from our theoretical calculations within our tests.
// TODO (perf): consider better conversion helpers to minimize reallocations.
amountBigDec := osmomath.BigDecFromDec(amount.ToLegacyDec())
amountBigDec := osmomath.BigDecFromSDKInt(amount)
diff := sqrtPriceB.Sub(sqrtPriceA)
if diff.IsZero() {
panic(fmt.Sprintf("liquidity1 diff is zero: sqrtPriceA %s sqrtPriceB %s", sqrtPriceA, sqrtPriceB))
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