75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
package common
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import (
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"crypto/rand"
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"fmt"
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"io"
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"os"
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"time"
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"github.com/golang/protobuf/ptypes/timestamp"
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)
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// GenerateBytesUUID 生成一个byte数组的UUID
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func GenerateBytesUUID() []byte {
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uuid := make([]byte, 16)
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_, err := io.ReadFull(rand.Reader, uuid)
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if err != nil {
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panic(fmt.Sprintf("Error generating UUID: %s", err))
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}
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// variant bits; see section 4.1.1
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uuid[8] = uuid[8]&^0xc0 | 0x80
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// version 4 (pseudo-random); see section 4.1.3
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uuid[6] = uuid[6]&^0xf0 | 0x40
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return uuid
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}
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// GenerateUUID 生成一个string类型的生成UUID
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func GenerateUUID() string {
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uuid := GenerateBytesUUID()
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return idBytesToStr(uuid)
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}
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// CreateUtcTimestamp 创建时间戳
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func CreateUtcTimestamp() *timestamp.Timestamp {
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now := time.Now().UTC()
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secs := now.Unix()
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nanos := int32(now.UnixNano() - (secs * 1000000000))
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return &(timestamp.Timestamp{Seconds: secs, Nanos: nanos})
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}
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// idBytesToStr 将byte数组转为字符串
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// 函数返回一个格式为 "xxxx-xx-xx-xx-xxxxxxxxxxxx" 的字符串，其中 "x" 表示一个十六进制数字
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func idBytesToStr(id []byte) string {
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return fmt.Sprintf("%x-%x-%x-%x-%x", id[0:4], id[4:6], id[6:8], id[8:10], id[10:])
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}
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// ConcatenateBytes 连接byte数组
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func ConcatenateBytes(data ...[]byte) []byte {
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finalLength := 0
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for _, slice := range data {
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finalLength += len(slice)
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}
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result := make([]byte, finalLength)
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last := 0
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for _, slice := range data {
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for i := range slice {
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result[i+last] = slice[i]
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}
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last += len(slice)
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}
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return result
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}
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// dirExists 判断一个路径是否存在
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func dirExists(path string) bool {
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fi, err := os.Stat(path)
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if err != nil {
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return false
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}
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return fi.IsDir()
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}
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