71 lines
1.4 KiB
Go
71 lines
1.4 KiB
Go
package util
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import (
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"fmt"
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"math/rand"
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"strconv"
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"time"
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)
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//human readable file size
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func HumanFileSize(bytes int64) string {
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var thresh int64 = 1024
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if bytes < 0 {
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bytes = 0
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}
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if bytes < thresh {
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return fmt.Sprintf("%dB", bytes)
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}
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var units = []string{"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"}
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var u = 0
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var tmp = float64(bytes)
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var standard = float64(thresh)
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for tmp >= standard && u < len(units)-1 {
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tmp /= float64(standard)
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u++
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}
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numStr := strconv.FormatFloat(tmp, 'f', 1, 64)
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return fmt.Sprintf("%s%s", numStr, units[u])
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}
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//get mysql url.
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func GetMysqlUrl(
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mysqlPort int,
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mysqlHost string,
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mysqlSchema string,
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mysqlUsername string,
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mysqlPassword string,
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mysqlCharset string) string {
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if mysqlCharset == "" {
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mysqlCharset = "utf8"
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}
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return fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=%s&parseTime=True&loc=Local", mysqlUsername, mysqlPassword, mysqlHost, mysqlPort, mysqlSchema, mysqlCharset)
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}
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//get random number 4.
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func RandomNumber4() string {
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return fmt.Sprintf("%04v", rand.New(rand.NewSource(time.Now().UnixNano())).Int31()%10000)
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}
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//get random 4 string
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func RandomString4() string {
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//0 and o, 1 and l are not easy to distinguish
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var letterRunes = []rune("abcdefghijkmnpqrstuvwxyz23456789")
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r := rand.New(rand.NewSource(time.Now().UnixNano()))
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b := make([]rune, 4)
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for i := range b {
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b[i] = letterRunes[r.Intn(len(letterRunes))]
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}
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return string(b)
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}
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