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// Copyright 2017 CoreOS, 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dbtester
import (
"fmt"
"io"
"io/ioutil"
mrand "math/rand"
"net/http"
"os"
"strings"
"time"
)
func toMillisecond(d time.Duration) float64 {
return d.Seconds() * 1000
}
func assignRequest(ranges []int64, total int64) (rs []int64) {
reqEach := int(float64(total) / float64(len(ranges)))
// truncate 10000th digits
if reqEach > 10000 {
reqEach = (reqEach / 10000) * 10000
}
// truncate 1000th digits
if reqEach > 1000 {
reqEach = (reqEach / 1000) * 1000
}
curSum := int64(0)
rs = make([]int64, len(ranges))
for i := range ranges {
if i < len(ranges)-1 {
rs[i] = int64(reqEach)
curSum += int64(reqEach)
} else {
rs[i] = int64(total) - curSum
}
}
return
}
func toFile(txt, fpath string) error {
f, err := os.OpenFile(fpath, os.O_RDWR|os.O_TRUNC, 0777)
if err != nil {
f, err = os.Create(fpath)
if err != nil {
return err
}
}
defer f.Close()
_, err = f.WriteString(txt)
return err
}
// exist returns true if the file or directory exists.
func exist(fpath string) bool {
st, err := os.Stat(fpath)
if err != nil {
if os.IsNotExist(err) {
return false
}
}
if st.IsDir() {
return true
}
if _, err := os.Stat(fpath); err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}
// gracefulClose drains http.Response.Body until it hits EOF
// and closes it. This prevents TCP/TLS connections from closing,
// therefore available for reuse.
func gracefulClose(resp *http.Response) {
io.Copy(ioutil.Discard, resp.Body)
resp.Body.Close()
}
// sequentialKey returns '00012' when size is 5 and num is 12.
func sequentialKey(size, num int64) string {
txt := fmt.Sprintf("%d", num)
if len(txt) > int(size) {
return txt
}
delta := int(size) - len(txt)
return strings.Repeat("0", delta) + txt
}
func sameKey(size int64) string {
return strings.Repeat("a", int(size))
}
func randBytes(bytesN int64) []byte {
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
)
src := mrand.NewSource(time.Now().UnixNano())
b := make([]byte, bytesN)
for i, cache, remain := bytesN-1, src.Int63(), letterIdxMax; i >= 0; {
if remain == 0 {
cache, remain = src.Int63(), letterIdxMax
}
if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
b[i] = letterBytes[idx]
i--
}
cache >>= letterIdxBits
remain--
}
return b
}