Golang 创建一个唯一的文件.

unique_file.go

import (
	"os"

	"github.com/satori/go.uuid"
)

func UniqueFile(dir, prefix string, flags int, perm os.FileMode) (f *os.File, err error) {
	unique_file_prefix := dir + "/" + prefix
	flags |= os.O_EXCL | os.O_CREATE

	GetRandomString := func() string {
		return uuid.NewV4().String()
	}

	for {
		unique_file_path := unique_file_prefix + GetRandomString()
		f, err = os.OpenFile(unique_file_path, flags, perm)
		if os.IsExist(err) {
			continue
		}
		break
	}

	return
}