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util.go
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util.go
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package util
import (
"fmt"
"log"
"net"
"os"
"strconv"
"strings"
"time"
"github.com/bingoohuang/gg/pkg/thinktime"
"github.com/spf13/viper"
)
// ErrorString returns the error string, err can be nil.
func ErrorString(err error) string {
if err != nil {
return err.Error()
}
return ""
}
func OrSlice(a, b map[string]string) map[string]string {
if len(a) > 0 {
return a
}
return b
}
// Cut cuts the s into two ones.
func Cut(s, sep string) (a, b string) {
ret := strings.Split(s, sep)
switch retSize := len(ret); {
case retSize >= 2:
return ret[0], ret[1]
case retSize >= 1:
return ret[0], ""
default:
return "", ""
}
}
// Think sleeps for a duration by envValue.
func Think(thinkTime, reason string) {
if reason == "" {
reason = "thinkTime"
}
if tt, _ := thinktime.ParseThinkTime(thinkTime); tt != nil {
if sleeping := tt.Think(false); sleeping > 0 {
log.Printf("sleeping for %s %s", reason, sleeping)
time.Sleep(sleeping)
}
}
}
func EnvDuration(name string, defaultValue time.Duration) time.Duration {
env := Env(name)
if env == "" {
return defaultValue
}
d, err := time.ParseDuration(env)
if err != nil {
log.Printf("E! parse env $%s = %s failed: %v", name, env, err)
return defaultValue
}
return d
}
func Env(name ...string) string {
for _, n := range name {
if v := os.Getenv(n); v != "" {
return v
}
}
for _, n := range name {
if v := viper.GetString(n); v != "" {
return v
}
}
return ""
}
func Atoi(v string, defaultValue int) int {
if a, err := strconv.Atoi(v); err != nil {
return defaultValue
} else {
return a
}
}
func RandPort(ip string, defaultPort int) int {
l, err := net.Listen("tcp", ip+":0")
if err != nil {
return defaultPort
}
p := l.Addr().(*net.TCPAddr).Port
l.Close()
return p
}
func IsPortFree(ip string, port int) bool {
ln, err := net.Listen("tcp", fmt.Sprintf("%s:%d", ip, port))
if err != nil {
return false
}
ln.Close()
return true
}
func FindFreePort(ip string, port int) int {
if IsPortFree(ip, port) {
return port
}
return RandPort(ip, port)
}
// RemoveCreateDir - create a directory structure, if still exist -> delete it before
func RemoveCreateDir(folderPath string) error {
if IsDir(folderPath) {
if err := os.RemoveAll(folderPath); err != nil {
return err
}
}
return os.MkdirAll(folderPath, os.ModePerm)
}
// IsDir - Check if input path is a directory
func IsDir(dirInput string) bool {
fi, err := os.Stat(dirInput)
if err != nil {
return false
}
switch mode := fi.Mode(); {
case mode.IsDir():
return true
case mode.IsRegular():
return false
}
return false
}
func FileExists(name string) bool {
if _, err := os.Stat(name); err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}
func Pick1[T any](s T, _ ...any) T {
return s
}