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util.go
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util.go
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package simulation
import (
"fmt"
"math/rand"
"os"
"sort"
"strings"
"testing"
"time"
"github.com/tendermint/tendermint/crypto/ed25519"
"github.com/tendermint/tendermint/crypto/secp256k1"
"github.com/cosmos/cosmos-sdk/baseapp"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/mock"
)
// shamelessly copied from https://stackoverflow.com/questions/22892120/how-to-generate-a-random-string-of-a-fixed-length-in-golang#31832326
// TODO we should probably move this to tendermint/libs/common/random.go
const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
const (
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
)
// 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)
}
// Pretty-print events as a table
func DisplayEvents(events map[string]uint) {
var keys []string
for key := range events {
keys = append(keys, key)
}
sort.Strings(keys)
fmt.Printf("Event statistics: \n")
for _, key := range keys {
fmt.Printf(" % 60s => %d\n", key, events[key])
}
}
// RandomAcc pick a random account from an array
func RandomAcc(r *rand.Rand, accs []Account) Account {
return accs[r.Intn(
len(accs),
)]
}
// Generate a random amount
func RandomAmount(r *rand.Rand, max int64) int64 {
return r.Int63n(max)
}
// RandomAccounts generates n random accounts
func RandomAccounts(r *rand.Rand, n int) []Account {
accs := make([]Account, n)
for i := 0; i < n; i++ {
// don't need that much entropy for simulation
privkeySeed := make([]byte, 15)
r.Read(privkeySeed)
useSecp := r.Int63()%2 == 0
if useSecp {
accs[i].PrivKey = secp256k1.GenPrivKeySecp256k1(privkeySeed)
} else {
accs[i].PrivKey = ed25519.GenPrivKeyFromSecret(privkeySeed)
}
accs[i].PubKey = accs[i].PrivKey.PubKey()
accs[i].Address = sdk.AccAddress(accs[i].PubKey.Address())
}
return accs
}
// Builds a function to add logs for this particular block
func addLogMessage(testingmode bool, blockLogBuilders []*strings.Builder, height int) func(string) {
if testingmode {
blockLogBuilders[height] = &strings.Builder{}
return func(x string) {
(*blockLogBuilders[height]).WriteString(x)
(*blockLogBuilders[height]).WriteString("\n")
}
}
return func(x string) {}
}
// assertAllInvariants asserts a list of provided invariants against application state
func assertAllInvariants(t *testing.T, app *baseapp.BaseApp, invariants []Invariant, where string, displayLogs func()) {
for i := 0; i < len(invariants); i++ {
err := invariants[i](app)
if err != nil {
fmt.Printf("Invariants broken after %s\n", where)
fmt.Println(err.Error())
displayLogs()
t.Fatal()
}
}
}
// 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)
}
// Creates a function to print out the logs
func logPrinter(testingmode bool, logs []*strings.Builder) func() {
if testingmode {
return func() {
numLoggers := 0
for i := 0; i < len(logs); i++ {
// We're passed the last created block
if logs[i] == nil {
numLoggers = i - 1
break
}
}
var f *os.File
if numLoggers > 10 {
fileName := fmt.Sprintf("simulation_log_%s.txt", time.Now().Format("2006-01-02 15:04:05"))
fmt.Printf("Too many logs to display, instead writing to %s\n", fileName)
f, _ = os.Create(fileName)
}
for i := 0; i < numLoggers; i++ {
if f != nil {
_, err := f.WriteString(fmt.Sprintf("Begin block %d\n", i))
if err != nil {
panic("Failed to write logs to file")
}
_, err = f.WriteString((*logs[i]).String())
if err != nil {
panic("Failed to write logs to file")
}
} else {
fmt.Printf("Begin block %d\n", i)
fmt.Println((*logs[i]).String())
}
}
}
}
return func() {}
}