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// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package ddltest
import (
"math/rand"
)
func randomInt() int {
return rand.Int()
}
func randomIntn(n int) int {
return rand.Intn(n)
}
func randomFloat() float64 {
return rand.Float64()
}
func randomString(n int) string {
const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
var bytes = make([]byte, n)
for i := range bytes {
bytes[i] = alphanum[randomIntn(len(alphanum))]
}
return string(bytes)
}
// Args
// 0 -> min
// 1 -> max
// randomNum(1,10) -> [1,10)
// randomNum(-1) -> random
// randomNum() -> random
func randomNum(args ...int) int {
if len(args) > 1 {
return args[0] + randomIntn(args[1]-args[0])
} else if len(args) == 1 {
return randomIntn(args[0])
} else {
return randomInt()
}
}