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