65 lines
2.0 KiB
Go
65 lines
2.0 KiB
Go
package simulation
|
|
|
|
import (
|
|
"math/big"
|
|
"math/rand"
|
|
"time"
|
|
|
|
sdk "github.com/cosmos/cosmos-sdk/types"
|
|
"github.com/cosmos/cosmos-sdk/x/mock"
|
|
)
|
|
|
|
const (
|
|
letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
|
letterIdxBits = 6 // 6 bits to represent a letter index
|
|
letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
|
|
letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
|
|
)
|
|
|
|
// shamelessly copied from
|
|
// https://stackoverflow.com/questions/22892120/how-to-generate-a-random-string-of-a-fixed-length-in-golang#31832326
|
|
// Generate a random string of a particular length
|
|
func RandStringOfLength(r *rand.Rand, n int) string {
|
|
b := make([]byte, n)
|
|
// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
|
|
for i, cache, remain := n-1, r.Int63(), letterIdxMax; i >= 0; {
|
|
if remain == 0 {
|
|
cache, remain = r.Int63(), letterIdxMax
|
|
}
|
|
if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
|
|
b[i] = letterBytes[idx]
|
|
i--
|
|
}
|
|
cache >>= letterIdxBits
|
|
remain--
|
|
}
|
|
return string(b)
|
|
}
|
|
|
|
// Generate a random amount
|
|
func RandomAmount(r *rand.Rand, max sdk.Int) sdk.Int {
|
|
return sdk.NewInt(int64(r.Intn(int(max.Int64()))))
|
|
}
|
|
|
|
// RandomDecAmount generates a random decimal amount
|
|
func RandomDecAmount(r *rand.Rand, max sdk.Dec) sdk.Dec {
|
|
randInt := big.NewInt(0).Rand(r, max.Int)
|
|
return sdk.NewDecFromBigIntWithPrec(randInt, sdk.Precision)
|
|
}
|
|
|
|
// RandomSetGenesis wraps mock.RandomSetGenesis, but using simulation accounts
|
|
func RandomSetGenesis(r *rand.Rand, app *mock.App, accs []Account, denoms []string) {
|
|
addrs := make([]sdk.AccAddress, len(accs))
|
|
for i := 0; i < len(accs); i++ {
|
|
addrs[i] = accs[i].Address
|
|
}
|
|
mock.RandomSetGenesis(r, app, addrs, denoms)
|
|
}
|
|
|
|
// RandTimestamp generates a random timestamp
|
|
func RandTimestamp(r *rand.Rand) time.Time {
|
|
// json.Marshal breaks for timestamps greater with year greater than 9999
|
|
unixTime := r.Int63n(253373529600)
|
|
return time.Unix(unixTime, 0)
|
|
}
|