77 lines
1.6 KiB
Go
77 lines
1.6 KiB
Go
package util
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import (
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"fmt"
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"math/rand"
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"os"
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"sync"
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"time"
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)
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const (
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randomStringCharset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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)
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var (
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random = rand.New(rand.NewSource(time.Now().UnixNano()))
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randomMutex = sync.Mutex{}
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)
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// FileExists checks if a file exists, and returns true if it does
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func FileExists(filename string) bool {
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stat, _ := os.Stat(filename)
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return stat != nil
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}
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// InStringList returns true if needle is contained in haystack
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func InStringList(haystack []string, needle string) bool {
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for _, s := range haystack {
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if s == needle {
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return true
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}
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}
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return false
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}
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// RandomString returns a random string with a given length
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func RandomString(length int) string {
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randomMutex.Lock() // Who would have thought that random.Intn() is not thread-safe?!
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defer randomMutex.Unlock()
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b := make([]byte, length)
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for i := range b {
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b[i] = randomStringCharset[random.Intn(len(randomStringCharset))]
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}
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return string(b)
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}
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// DurationToHuman converts a duration to a human readable format
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func DurationToHuman(d time.Duration) (str string) {
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if d == 0 {
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return "0"
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}
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d = d.Round(time.Second)
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days := d / time.Hour / 24
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if days > 0 {
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str += fmt.Sprintf("%dd", days)
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}
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d -= days * time.Hour * 24
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hours := d / time.Hour
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if hours > 0 {
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str += fmt.Sprintf("%dh", hours)
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}
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d -= hours * time.Hour
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minutes := d / time.Minute
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if minutes > 0 {
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str += fmt.Sprintf("%dm", minutes)
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}
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d -= minutes * time.Minute
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seconds := d / time.Second
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if seconds > 0 {
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str += fmt.Sprintf("%ds", seconds)
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}
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return
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}
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