mirror of
https://github.com/0glabs/0g-chain.git
synced 2024-11-10 18:15:19 +00:00
45e40fe357
* feat: kavadist sims * refactor genesis, add validation * implement params * rename simulation to genesis Co-authored-by: Kevin Davis <kjydavis3@gmail.com>
65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
package simulation
|
|
|
|
import (
|
|
"errors"
|
|
|
|
sdk "github.com/cosmos/cosmos-sdk/types"
|
|
)
|
|
|
|
// TODO use the official version available in v0.38.2 of the sdk
|
|
// https://github.com/cosmos/cosmos-sdk/blob/e8d89a2fe26175b73545a3e79ae783032b4e975e/types/decimal.go#L328
|
|
func approxRoot(d sdk.Dec, root uint64) (guess sdk.Dec, err error) {
|
|
defer func() {
|
|
if r := recover(); r != nil {
|
|
var ok bool
|
|
err, ok = r.(error)
|
|
if !ok {
|
|
err = errors.New("out of bounds")
|
|
}
|
|
}
|
|
}()
|
|
|
|
if d.IsNegative() {
|
|
absRoot, err := approxRoot(d.MulInt64(-1), root)
|
|
return absRoot.MulInt64(-1), err
|
|
}
|
|
if root == 1 || d.IsZero() || d.Equal(sdk.OneDec()) {
|
|
return d, nil
|
|
}
|
|
if root == 0 {
|
|
return sdk.OneDec(), nil
|
|
}
|
|
rootInt := sdk.NewInt(int64(root))
|
|
guess, delta := sdk.OneDec(), sdk.OneDec()
|
|
for delta.Abs().GT(sdk.SmallestDec()) {
|
|
prev := power(guess, (root - 1))
|
|
if prev.IsZero() {
|
|
prev = sdk.SmallestDec()
|
|
}
|
|
delta = d.Quo(prev)
|
|
delta = delta.Sub(guess)
|
|
delta = delta.QuoInt(rootInt)
|
|
|
|
guess = guess.Add(delta)
|
|
}
|
|
return guess, nil
|
|
}
|
|
|
|
// Power returns a the result of raising to a positive integer power
|
|
func power(d sdk.Dec, power uint64) sdk.Dec {
|
|
if power == 0 {
|
|
return sdk.OneDec()
|
|
}
|
|
tmp := sdk.OneDec()
|
|
for i := power; i > 1; {
|
|
if i%2 == 0 {
|
|
i /= 2
|
|
} else {
|
|
tmp = tmp.Mul(d)
|
|
i = (i - 1) / 2
|
|
}
|
|
d = d.Mul(d)
|
|
}
|
|
return d.Mul(tmp)
|
|
}
|