package main

import (
	"fmt"
	"archive/tar"
	//"errors"
	"io"
	"io/ioutil"
	"os"
	"path/filepath"
	"strings"
)

func main() {
    f, err := os.OpenFile("hello.tar", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0777)
    if err != nil {
        panic(err)
    }
    defer f.Close()

     err = Persist(f)
    if err != nil {
        panic(err)
    }

}

func Persist(wr io.Writer) error {

	tw := tar.NewWriter(wr)
    defer tw.Close()
   
	
	dirPath := filepath.Dir("/opt/matrix/var/logs/odbserver/log.db")
	
	if dir, err := ioutil.ReadDir( dirPath ) ; err != nil {
		return err
	} else {
		println(dir)
		PthSep := string(os.PathSeparator)

		for _, fi := range dir {
			if fi.IsDir() { // 忽略目录
				continue
			}
			
			//-------------------------------
			// 把所有db保存为tar格式
			//-------------------------------
			println("name ==>"+fi.Name())
			if strings.HasSuffix(fi.Name(), ".db") { //匹配文件
				
				file := dirPath+PthSep+fi.Name()
				println("file =>", file)
				if f, err := os.Open(file) ; err != nil {
					return err
				}else{
					
					if header, err := tar.FileInfoHeader(fi, "") ; err != nil {
						return err
					}else{
						header.Name =  "/" + header.Name
						println("header.Name =>"+header.Name)
						if err = tw.WriteHeader(header) ; err != nil {
							return err
						}else{
							if n, err := io.Copy(tw, f) ; err != nil {
								return err
							}else{
								 fmt.Printf("n==> %d", n)
								 f.Close()
							}
						}
					}
				}
			}
		}
	}
	
	return nil
}