82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ddltest
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import (
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"math/rand"
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"strconv"
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)
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func randomInt() int {
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return rand.Int()
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}
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func randomIntn(n int) int {
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return rand.Intn(n)
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}
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func randomFloat() float64 {
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return rand.Float64()
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}
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func randomString(n int) string {
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const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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var bytes = make([]byte, n)
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for i := range bytes {
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bytes[i] = alphanum[randomIntn(len(alphanum))]
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}
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return string(bytes)
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}
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// Args
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// 0 -> min
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// 1 -> max
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// randomNum(1,10) -> [1,10)
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// randomNum(-1) -> random
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// randomNum() -> random
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func randomNum(args ...int) int {
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if len(args) > 1 {
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return args[0] + randomIntn(args[1]-args[0])
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} else if len(args) == 1 {
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return randomIntn(args[0])
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} else {
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return randomInt()
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}
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}
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// Args
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// 0 -> min
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// 1 -> max
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// 2 -> prec
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// randomFloat64(1,10) -> [1.0,10.0]
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// randomFloat64(1,10,3) -> [1.000,10.000]
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// randomFloat64(-1) -> random
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// randomFloat64() -> random
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func randomFloat64(args ...int) float64 {
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value := float64(randomNum(args...))
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if len(args) > 2 {
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fvalue := strconv.FormatFloat(value, 'f', args[2], 64)
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value, _ = strconv.ParseFloat(fvalue, 64)
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}
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return value
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}
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// true/false
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func randomBool() bool {
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value := randomIntn(2)
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return value == 1
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}
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